EN 12355:2003

SLOVENSKI STANDARD
01-julij-2003
Stroji za predelavo hrane - Stroji za odstranjevanje kože - Varnostne in higienske
zahteve
Food processing machinery - Derinding-, skinning- and membrane removal machines -
Safety and hygiene requirements
Nahrungsmittelmaschinen - Entschwartungs-, Enthäutungs- und Entvliesmaschinen -
Sicherheits- und Hygieneanforderungen
Machines pour les produits alimentaires - Machines a découenner, éplucher et peler -
Prescriptions relatives a la sécurité et a l'hygiene
Ta slovenski standard je istoveten z: EN 12355:2003
ICS:
67.260 Tovarne in oprema za Plants and equipment for the
živilsko industrijo food industry
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 12355
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2003
ICS 67.260
English version
Food processing machinery - Derinding-, skinning- and
membrane removal machines - Safety and hygiene
requirements
Machines pour les produits alimentaires - Machines à Nahrungsmittelmaschinen - Entschwartungs-, Enthäutungs-
découenner, éplucher et peler - Prescriptions relatives à la und Entvliesmaschinen - Sicherheits- und
sécurité et à l'hygiène Hygieneanforderungen
This European Standard was approved by CEN on 21 November 2002.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2003 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12355:2003 E
worldwide for CEN national Members.

Contents
page
Foreword.3
Introduction .4
1 Scope .4
2 Normative references .8
3 Terms and definitions.9
4 List of hazards.10
4.1 General.10
4.2 Mechanical hazards .11
4.3 Electrical hazards .14
4.4 Hazards generated by loss of stability .14
4.5 Hazard generated by noise .14
4.6 Hazards from non-compliance with ergonomic principles .14
4.7 Hazards from non-compliance with hygienic principles .14
5 Safety requirements and/or measures .14
5.1 General.14
5.2 Mechanical hazards .15
5.3 Electrical hazards .26
5.4 Hazards from loss of stability.28
5.5 Noise reduction.28
5.6 Ergonomic requirements .28
5.7 Hygiene and cleaning .28
6 Verification of safety and hygiene requirements and/or measures.30
7 Information for the user .32
7.1 Instruction Handbook.32
7.2 Operator training.33
8 Marking .34
Annex A (normative)  Noise test code for derinding-, skinning- and membrane removal machines
(grade 2).35
Annex B (normative)  Design principles to ensure the cleanability of derinding-, skinning- and
membrane removal machines .37
Annex C (normative)  Common hazards for food processing machines and reduction requirements
applicable to derinding-, skinning- and membrane removal machines.42
Annex ZA (informative)  Relationship of this document with EC Directives.44
Bibliography .45
Foreword
This document (EN 12355:2003) has been prepared by Technical Committee CEN/TC 153 “Food processing
machinery - Safety and hygiene specifications", the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an identical text or
by endorsement, at the latest by August 2003, and conflicting national standards shall be withdrawn at the latest by
August 2003.
This document has been prepared under a mandate given to CEN by the European Commission and the European
Free Trade Association, and supports essential requirements of EU Directive(s).
For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document.
It is one of a series of standards for meat processing machinery, in compliance with EN 1672-2 and annex C.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal,
Slovakia, Spain, Sweden, Switzerland and the United Kingdom.
Introduction
This European Standard relates to:
derinding machines with tooth roll, hold down roller and blade device;
skinning- and membrane removal machines with transport- and stripper roll as well as a blade device.
1 Scope
1.1 This European Standard applies to design, manufacturing, installation, transportation, electrical equipment
and cleaning of derinding-, skinning-, and membrane removal machines (see Figures 1 to 5).
The machines described in this standard are used for derinding-, skinning- and membrane removal of meat and
fish by cutting at a blade device.
Derinding-, skinning-, and membrane removal machines for domestic purposes and table-top machines are not
covered by this standard.
This standard only applies to machines which are manufactured after the date of issue of this standard.
1.2 This standard covers the following types of machines:
Open derinding machines with infeed table and a distance between the floor and the surface of the infeed
table from 800 mm to 1 050 mm.
Tooth form of the tooth roll:
Depth < 5,0 mm
Pitch < 6,5 mm
(see Figures 1 and 2)
Key Key
1 Tooth roll/ 6 ON/OFF Switch, cover 1 Round product 4 Tooth roll
Transport roll 7 Foot switch 2 Cutting thickness < 5 mm 5 Blade holder
2 Blade 8 Drive 3 Infeed table 6 Blade
3 Discharge table 9 Locking device 7 Rind
4 Blade holder 10 Table height 8 Stripper comb
5 Infeed table
Figure 1 — Derinding-, skinning- and membrane   Figure 2 — System of an open derinding machine
removal machine
Automatic derinding machine with infeed, hold down, and outfeed device and a distance between the floor and
the surface of the infeed device, e.g. conveyor belt between 800 mm and 1 050 mm.
Tooth form of the tooth roll:
Depth <  5,0 mm
Pitch < 12,0 mm
Hold down roller diameter 175 mm to 240 mm.
(see Figures 3 and 4)
Key Key
1 Outfeed conveyor belt 5 Blade 1 Hold-down rollers 5 Stripper comb or
2 Mobile guard 6 Tooth or conveyor roll 2 Infeed conveyor belt stripper roll
3 Hold-down rollers 7 Infeed conveyor 3 Product 6 Blade
4 Blade holder 8 Drive 4 Tooth or conveyor roll 7 Blade holder
8 Outfeed conveyor
Figure 3 — Automatic Derinding- and membrane Figure 4 — System of an automatic derinding- and
removal machine membrane machine
Open skinning- and membrane removal machine with infeed table and a distance between the floor and the
surface of the infeed table between 800 mm and 1 050 mm.
Groove form of the transport roller:
Depth < 2,0 mm
Pitch < 2,5 mm
(see Figures 1 and 5)
Key
1 Infeed table 5 Blade holder
2 Product 6 Membrane
3 Cutting 7 Transport roll
Thickness < 0,5 mm 8 Stripper roll
4 Blade
Figure 5 — System of a membrane removal machine
Derinding-, skinning- and membrane removal machines consist mainly of a machine frame, tooth roll with stripper
comb, hold down roller with stripper rake, transport roll with stripper roll and air jet cleaning blade device and
electrical, electronic, or pneumatic components, depending on the machine type.
Derinding-, skinning- and membrane removal machines can e.g. be equipped with a:
infeed and outfeed table;
infeed- and outfeed conveyor belts;
blade device;
double blade;
hold down device, (e.g. hold down rollers, belts or fingers);
circular knives inside or instead of hold down rollers;
stripper comb/stripper roll/stripper rake.
Derinding-, skinning- and membrane removal machines can be mobile (see Figures 1 and 3).
1.3 Intended use
The intended uses of the machines are described in clause 7 of this standard, Information for use.
The product (raw meat or raw fish) with a weight < 15 kg which is to be processed is either fed by hand or by an
infeed device (e.g. infeed conveyor belt) and a hold down device carried to the tooth or transport roller. Using open
derinding-, skinning- and membrane removal machines, the product is pressed by hand against the blade device
and the rind, the skin or the membrane is cut off by the blade.
1.4 Not intended use
A not intended use is e.g.:
the wrong installation of a derinding-, skinning- and membrane removal machine;
the processing of flat products on open derinding machines;
working on open derinding-, skinning- and membrane removal machines without using the gloves which the
manufacturer recommends;
manipulation of interlocking systems on safety devices;
using of cleaning- and disinfection detergents, which are not recommended by the manufacturer in the
instructions for use.
2 Normative references
This European Standard incorporates by dated or undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For
dated references, subsequent amendments to or revisions of any of these publications apply to this European
Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the
publication referred to applies (including amendments).
EN 292-2:1991, Safety of machinery – Basic concepts, general principles for design – Part 2: Technical principles
and specifications.
EN 614-1, Safety of machinery – Ergonomic design principles – Part 1: Terminoloy and general principles.
EN 953:1997, Safety of machinery – Guards-General requirements for the design and construction of fixed and
movable guards.
EN 954-1:1996, Safety of machinery – Safety-related parts of control systems – Part 1: General principles for
design.
EN 1005-1, Safety of machinery – Human physical performance – Part 1: Terms and definitions.
prEN 1005-2, Safety of machinery – Human physical performance – Part 2: Manual handling of machinery and
component parts of machinery.
EN 1005-3, Safety of machinery – Human physical performance – Part 3: Recommended force limits for machinery
operation.
EN 1088:1995, Safety of machinery – Interlocking devices associated with guards – Principles for design and
selection.
EN 1672-2:1997, Food processing machinery – Basic concepts – Part 2: Hygiene requirements.
EN 60204-1:1997, Safety of machinery – Electrical equipment of machines – Part 1: General requirements (IEC
60204-1:1997).
EN 61000-6-1, Electromagnetic compatibility (EMC) – Part 6-1: Generic standards; Immunity for residential,
commercial and light-industrial environments (IEC 61000-6-1:1997, modified).
EN 61000-6-2, Electromagnetic compatibility (EMC) – Part 6-2: Generic standards; Immunity for industrial
environments (IEC 61000-6-2:1999, modified).
EN 61000-6-3, Electromagnetic compatibility (EMC) – Part 6-3: Generic standards; Emission standard for
residential, commercial and light-industrial environments (IEC 61000-6-3:1996, modified).
EN 61000-6-4, Electromagnetic compatibility (EMC) – Part 6-4: Generic standards; Emission standard for industrial
environments (IEC 61000-6-4:1997, modified).
EN 60529, Degrees of protection provided by enclosures (IP code) (IEC 60529:1989).
EN 61496-1:1997, Safety of machinery – Electro-sensitive protective equipment – Part 1: General requirements
and tests (IEC 61496-1:1997).
EN ISO 4287:1998, Geometrical product specifications (GPS) – Surface texture: Profile method – Terms,
definitions and surface texture parameters (ISO 4287:1997).
EN ISO 4871, Acoustics – Declaration and verification of noise emission values of machinery and equipment –
(ISO 4871:1996).
EN ISO 11204:1995, Acoustics – Noise emitted by machinery and equipment – Measurement of emission sound
pressure levels at a work station and at other specified positions – Method requiring environmental corrections (ISO
11204:1995).
EN ISO 11688-1, Acoustics – Recommended practice for the design of low-noise machinery and equipment – Part
1: Planning (ISO/TR 11688-1:1995).
3 Terms and definitions
For the purposes of this European Standard and in addition to the terms and definitions given in the standards
which are listed in clause 2, the following terms and definitions apply.
3.1
strip
mechanical process for stripping off skin or membrane from rotating machine parts
3.2
stripper comb
comb-shaped insert in the tooth roll for the stripping
3.3
stripper rake
rake-shaped insert engaged between the hold-down rollers of the hold-down device for stripping
3.4
stripper roll
shaft with teeth to strip skin or membrane off the transport roller
3.5
hold down device
rollers, conveyors or mechanical fingers to press down and move products
3.6
combiation derinding and membrane removal machine
machine which can be used as open or automatic derinding- and membrane removal machine
3.7
double blade
two blade devices installed one above the other
3.8
air jet cleaning device
device with jets to blow off skin or membrane
3.9
blade device
blade holder with blade in position
3.10
blade holder
device to act as a holding tool for the blade
3.11
circular blade
rotating cutting tool for the slashing of products
3.12
round product
pickled knuckle of pork, hind ham
3.13
hold-to-run control device
switch which needs a continuous actuation for operation
3.14
cover guard
fixed or movable guard over the infeed, outfeed and hold down device
3.15
transport roll
shaft with teeth in a grooved pattern without stripper grooves for the transportation of product
3.16
tooth roll
shaft with teeth and stripper grooves for the transportation of product
3.17
infeed and outfeed device
conveyor belts for the feed and removal of products
3.18
infeed and outfeed table
table surface for the feeding or removal of product by hand
4 List of hazards
4.1 General
This clause and annex C contains the hazards and hazardous situations based upon EN 1050 as far as they are
dealt with in this European Standard, identified by a risk assessment significant for derinding-, skinning- and
membrane removal machines, and actions to eliminate or reduce risk.
Before using this standard it is important to carry out a risk assessment of the derinding-, skinning- and membrane
removal machines to check that it has the hazards identified in this clause.
4.2 Mechanical hazards
4.2.1 Open derinding machine with infeed table
Zone 1
Rotating tooth roll and height adjustable blade holder with blade (see Figure 6).
Hazards of separation of the skin or the fingers being drawn in.
Zone 2
Rotating tooth roll and stripper comb (see Figure 6).
Hazards of fingers or hand being drawn in.
Zone 3
Rotating tooth roll and fixed machine parts (see Figure 6).
Hazards of the fingers, hand or lower arm being drawn in.
Zone 4
Rotating tooth roll with adjustable height double blade (see Figure 10).
Hazards of fingers being drawn in and cutting fingers, hand or lower arm.
4.2.2 Automatic derinding-, skinning- and membrane removal machine
Zone 1
Rotating tooth roll/conveyor roll, height adjustable blade holder with blade and hold down rollers or –fingers
(see Figure 7).
Hazards of separation of skin or fingers, hand or lower arm being drawn in.
Zone 2
Rotating hold down- rollers or -fingers and protective cover (see Figure 7).
Hazards of fingers or hand being drawn in.
Zone 3
Rotating tooth roll/conveyor roll and stripper comb/stripper roll (see Figure 7).
Hazards of the fingers or the hand being drawn in.
Zone 4
Rotating tooth roll/conveyor roll and fixed machine parts (see Figure 7).
Hazards of fingers, hand or lower arm being drawn in.
Zone 5
Rotating conveyor belt and drive and guide rolls (see Figure 7).
Hazards of fingers or hand being drawn in crushing.
Zone 6
Rotating circular blade (see Figure 7).
Hazards of cutting fingers or hand.
Zone 7
Machine components
Unintended closure of guard covers
Hazards of crushing of the hand
Key Key
1 Zone 1 1 Zone 1 5 Zone 5
2 Zone 2 2 Zone 2 6 Zone 6 (circular blade)
3 Zone 3 3 Zone 3 7 Zone 7
4 Zone 4
Figure 6 — Open derinding machine Figure 7 — Automatic derinding and membrane
- danger zones           removal machine- danger zones
4.2.3 Open skinning and membrane removal machine with infeed table
Zone 1
Rotating transport roller and fixed blade holder with blade (see Figure 8).
Hazard of the skin being separated.
Zone 2
Rotating transport roll and rotating stripper roll (see Figure 8).
Hazards of fingers or hand being drawn in/crushing.
Zone 3
Rotating transport roll/stripper roll with fixed machine parts and air jet cleaning device (see Figure 8).
Hazards of fingers or hand or lower arm being drawn in.
With automatic skinning- and membrane removal machines similar hazards exist as with automatic derinding
machines, see 4.2.2.
Key
1 Zone 1
2 Zone 2
3 Zone 3
Figure 8 — Open skinning and membrane removal machine - danger zones
4.2.4 Drive system
Zone 8
Tooth roll, transport roll/stripper and hold down device drive systems.
Hazards of fingers or hand being crushed.
4.3 Electrical hazards
4.3.1 Direct or indirect contact with live parts
Hazard from electric shock to the body.
4.3.2 Electrical components with insufficient safety level
Hazard of mechanical injury to the body due to malfunction.
4.4 Hazards generated by loss of stability
Zone 9
Mobile derinding-, skinning- and membrane removal machines (see Figures 1 and 3).
Hazard of impact or crushing to the body if machine topples over.
4.5 Hazard generated by noise
Derinding-, skinning- and membrane removal machines may generate noise which can result in hearing damage, in
accidents due to interference with speech communication and interference with the perception of acoustic signals.
4.6 Hazards from non-compliance with ergonomic principles
Unhealthy body postures or excessive efforts
Insufficient consideration of human hand/arm or foot/leg anatomy during machine design
Hazard of harm to the body
4.7 Hazards from non-compliance with hygienic principles
Microbiological causes
Hazard (spoilage) of the foodstuff
Hazard of damage to health of the consumer through food poisoning
Infection of the operator
Chemical causes
Contamination of foodstuff through residues of cleaning and disinfecting agents causing harm to consumer
Physical causes
Entrapped items originating from raw materials, machine parts or other sources causing harm to consumer.
5 Safety requirements and/or measures
5.1 General
Derinding, skinning and membrane removal machines shall comply with the safety requirements and/or protective
measures of this clause and of annex C. In addition, the machine shall be designed according to the principles of
EN 292 for the hazards relevant but not significant, which are dealt with by this document (e.g. sharp edges).
NOTE  For hazards which are to be reduced by the application of another standard such as EN 294, EN 953, EN 1672-2,
EN 60204-1, etc. the manufacturer should carry out a risk assessment to establish the requirements of that other standard
which are to be applied. This specific risk assessment is part of the general risk assessment of the machine.
Where the means of reducing the risk is by the physical arrangement or positioning of the installed derinding-,
skinning- or membrane removal machines, the manufacturer shall include in the Information for use a reference to
the reduction means to be provided, and to any limiting value of the requirement, and, if appropriate, to the means
of verification.
Where the means of reducing the risk is by a safe system of working the machinery, the manufacturer shall include
in the Information for use details of the system and of the elements of training required by the operating personnel.
5.2 Mechanical hazards
Derinding-, skinning- and membrane removal machines shall be designed and constructed in accordance with
annex C and to the requirements mentioned below.
The locking systems of safety devices shall be in accordance to 4.2.1 of EN 1088:1995 and the safety related parts
of the control system shall be in accordance with category 1 of EN 954-1:1996.
Additionally locking devices shall be:
for fulfillment the hygiene requirements;
for protection against mechanical damages;
for protection against influence of cleaning and disinfection detergents;
for protection against influence of cleaning liquids (water);
for protection against evading in a simple way
built in the machine housing and correspond to 5.7 of EN 1088:1995.
In the Information for use the manufacturer shall give an information of the daily verification of the locking device.
5.2.1 Open derinding machine with infeed table
5.2.1.1 - Zone 1
The access to the cutting area and gap between the rotating tooth roll and height adjustable blade holder with
blade shall be restricted. This can be achieved e.g. by observance of the following measures:
5.2.1.1.1 The adjustable distance between the rotating tooth roll and the tip of the cutting edge of the blade shall
be < 5,0 mm.
5.2.1.1.2 The blade and the blade holder shall be designed such that the blade can only be placed in a defined
position (see Figure 9).
Figure 9 — Blade designs for defined position
5.2.1.1.3 The free part of the tooth roll between knife and front edge of the table is not allowed to be more than 35°
of the circumference of the roll for a table height between 800 mm and 1 050 mm. In the case of exceptionally tall
round products (e.g. ham) there can be used an infeed table which permits a free part of the tooth roll not more
than 90° for a table height > 800 mm.
5.2.1.1.4 The operation switch for the drive system of the tooth roll shall be a hold-to-run control. The tooth roll shall
stop within 2 s, after the operator has released the operating switch (see 5.3.1). The operating switch can, for
example, be foot, knee or belly operated and shall be protected against unintentional actuation.
5.2.1.1.5 Normal positioning of machines
The access to open derinding machines shall be prevented, except the operator side. This will be achieved e.g. by
the following measures:
normal positioning of a machine in a small working area
An open derinding machine shall be positioned with one side towards a wall. The table and a container shall be
placed on the other free sides to receive the round products (see Figures 10 and paragraph 7.1a).
The operator stands in front of the open derinding machine. By this way of positioning access to the open derinding
machine is prevented for other persons.
normal machine positioning in working area with cutting line
An open derinding machine shall be positioned with one side against the cutting line. The table and a container will
be placed on the other free sides in order to receive the round products (see Figure 11 and paragraph 7.1a).
The operator stands in front of the open derinding machine. By this way of positioning access to the open derinding
machine is prevented for other persons.
Key Key
1 Table or container 1 Table or container
2 Open derinding machines 2 Open derinding machines
3 Cutting wall 3 Cutting line
Figure 10 — Open derinding machine in a smaller Figure 11 — Open derinding machine on a cutting
working area line
5.2.1.1.6 Further possibility of positioning
The access to the tooth roll by third party personnel shall be prevented at an free standing, open derinding machine
by a fixed guard, e.g. guarding fence (see Figure 12). The dimensions of the guardings shall be in accordance with
EN 294.
Figure 12 — Example of guard preventing access to the tooth roll by third party personnel at rear or sides
5.2.1.1.7 Normal operating conditions
Only round products (e.g. pickled knuckle of pork or ham) shall be processed on open derinding machines
(see 5.2.1.1.10).
Flat products (e.g. fatbacks) shall only be used in conjunction with automatic derinding machines (see 5.2.2).
5.2.1.1.8 Wearing of protective gloves
When operating an open derinding machine, the operator shall only wear manufacturer approved protective
gloves. Metal wire mesh gloves, or metal wire reinforced gloves shall not be worn (see 7.1.d).
On open derinding machines a permanently fixed notification shall be present, with the following text:
“Attention: Do not wear metal wire mesh gloves or metal wire reinforced gloves”.
5.2.1.1.9 Operator training
The manufacturer shall devise safe working procedures to be followed by operators. These shall be included in the
instructions for use (see 5.2.1.1.10), together with the elements of training and frequency of retraining to be given
to the operators.5.2.1.1.10 Information in the instruction handbook.
5.2.1.1.10 The manufacturer shall in the instruction handbook describe clearly:
processing of tall, round products ( 5.2.1.1.3);
the normal positioning of machines in small working areas ( 5.2.1.1.5, paragraph 1);
the normal machine positioning in working areas with cutting line (5.2.1.1.5, paragraph 2);
further possibility of machine positioning (5.2.1.1.6);
normal operating conditions on open derinding machines (5.2.1.1.7);
wearing of protective gloves (5.2.1.1.8);
operator training before starting the process (5.2.1.1.9).
5.2.1.2 - Zone 2
The access to the inrunning nip between tooth roll and stripper comb shall be prevented. This can be achieved e.g.
by observance of the following measures:
5.2.1.2.1 The angle between tooth roll and stripper comb shall be > 90° (see Figure 13).
5.2.1.2.2 The stripper comb shall be interlocked. Requirements for the interlocking of the stripper comb,
see 5.2.
Key
1 Tooth roll 1 Tooth roll
2 Stripper comb 2 Stripper comb
3 Protective bar
Figure 13 — Open derinding machine Figure 14 — Open derinding machine,
tooth roll with stripper comb tooth roll with protective bar
5.2.1.3 - Zone 3
The access to the inrunning nip between rotating tooth roll and fixed machine parts shall be prevented. This can be
achieved e.g. by the following measures:
5.2.1.3.1 The distance between a rotating tooth roll and a fixed machine part shall be > 80 mm (see Figure 13).
5.2.1.3.2 Shorter distances shall be guarded by a protective bar. The angle shall be > 90° and the distance
between protective bar and tooth roll shall be < 2,0 mm (see Figure 14).
5.2.1.4 - Zone 4
When using a double blade above the blade holder, the double blade shall not form an inrunning nip with the tooth
roll. This will be achieved, if the stand out of the knife tips is > 2 mm (see Figure 15).
Key
1  Double blade
2  Blade holder
Figure 15 — Location of a double blade relative to the blade holder
5.2.2 Automatic derinding- and membrane removal machine
5.2.2.1 - Zone 1
The access to the cutting edge and inrunning nip between the rotating tooth/transportation roll, adjustable height
blade holder with blade and rotating hold down rollers/hold down finger rollers shall be restricted. This can be
achieved e.g. by observance of the following measures:
5.2.2.1.1 At the infeed side:
the product shall be fed to the tooth/transportation roll and the hold down rollers/hold down finger rollers by
means of a conveyor belt;
there shall be a guard (e.g. tunnel shaped cover);
the cover shall be movable and interlocked (see Figure 16);
a fixed cover shall be provided and the upper edge of the infeed opening shall be provided with a trip device
(e.g. trip bar or light barrier) (see Figure 17).
Key Key
1 Mobile guard 2 Fixed cover
3 Trip bar
4 Light sensor
Figure 16 — Mobile interlocked guard with
interlocking switch with a fixed cover Figure 17 — Fixed cover with trip bar / light sensor
The tunnel shaped guard shall continue into the guard over the hold down rollers / hold down finger rollers
(see Figure 18).
The tunnel-shaped guard by itself or in combination with light barrier (ESPE electro-sensitive protection
equipment) over the infeed device shall meet to the following dimensions in Table 1 (see Figure 18).
The length of the fixed part of the guard shall be > 200 mm by using a light barrier (see Figure 19).
Table 1 — Relation of opening height B and C to distance A from the inrunning up (Dimensions in
millimetres)
A> 230 450 550 A = Distance to inrunning nip
B< 40 95 125 B = Opening height including control distance at the front
edge of the guard or trip bar
C< 50 125 155
C = Opening height of the guard in
combination with one or more light barriers
Key Key
1 Product 1 Light barriers
2 Stripper rake 2 Product
3 Fixed bar 3 Fixed bar
Figure 18 — Automatic derinding machine - Figure 19 — Automatic derinding machine -
safety measures at the infeed safety measures at the infeed and outfeed
The tooth roll and hold down roller/hold down finger roller shall stop within 2 s, after the interlocking of the
movable guard, the trip bar or the light barrier has been actuated. The guard shall be designed and pivoted
such that it can be operated with a force < 50 N.
Requirements for the interlocking of the movable guard and switch bar, see 5.2. The photoelectric device shall
comply with ESPE Type 2 of EN 61496-1:1997.
5.2.2.2 - Zone 2
The access to the inrunning nip between the hold down rollers and guard shall be restricted. This can be achieved
e.g. by the following measures:
5.2.2.2.1 At the outfeed side a stripper rake shall be provided between the rotating hold down rollers and the guard.
The angle between the hold down rollers and the stripper rake shall be > 90° and the distance between the hold
down rollers and the guard shall be 25 mm ± 1,0 mm (see Figure 19).
5.2.2.3 - Zone 3
The access to the inrunning nip between the rotating tooth roll and the stripper comb shall be prevented. This can
be achieved e.g. by the following measures:
Safety requirements see 5.2.1.2, Zone 2.
5.2.2.4 - Zone 4
The access to the inrunning nip between the rotating tooth roll and fixed machine parts shall be prevented. This
can be achieved e.g. by observance of the following measures:
Safety requirements see 5.2.1.3, Zone 3.
5.2.2.5 - Zone 5
The access to the inrunning nips between conveyor and drive and return rollers shall be prevented. This can be
achieved e.g. by observance of the following measures:
At the inrunning nip points between the conveyor and the drive and return rollers a fixed guard (e.g. side covers)
shall be provided.
5.2.2.6 - Zone 6
The access to the cutting edges of the circular blades at the outfeed side shall be restricted. This can be achieved
e.g. by observance of the following measures:
the product shall be carried away from the rotating circular blades by means of a conveyor belt and
be provided with a guard (e.g. tunnel-shaped cover);
the cover shall be movable and interlocked see Figure 16);
if a fixed cover is used, the upper edge of the outfeed opening shall be provided with a trip device (e.g. trip bar
or light barrier) (see Figure 17);
the dimensions of the cover shall meet the measures of Table 1 (see 5.3.1.1.1);
requirements for the interlocking of the movable guard and trip device, see 5.2. The light barrier shall be ESPE
type 2, according to EN 61496-1:1997.
5.2.2.7 - Zone 7
Opening machine components, e.g. guards shall be prevented against falling into the closed position. This can be
achieved e.g. by observance of the following measures:
5.2.2.7.1 The movable safety guard in its open position shall be sufficiently far behind the point of balance.
5.2.2.7.2 When its open position is insufficiently far behind the point of balance, there shall be provided e.g. a
counterbalance or spring.
5.2.3 Combination derinding- and membrane removal machine
A combination derinding- and membrane removal machine can be used as automatic or open derinding machine
with infeed table.
5.2.3.1 If a combination derinding- and membrane removal machine is used as a combination machine with hold
down rollers/hold down finger rollers, there shall be met the safety requirements of 5.2.2.
5.2.3.2 If a combination derinding- and membrane removal machine is used without hold down rollers/hold down
finger rollers and cover like an open derinding- and membrane removal machine with infeed table, there shall be
met the safety requirements of 5.2.1 and 5.2.4.
5.2.4 Open skinning and membrane removal machine with infeed table
5.2.4.1 - Zone 1
The access to the cutting edge and entanglement area between the rotating transport roll and fixed blade shall be
restricted. This will be achieved e.g. by observance of all following measures:
5.2.4.1.1 The distance between the rotating transport roller and the tip of the cutting edge of the blade shall be
< 0,5 mm.
5.2.4.1.2 The blade and the blade holder shall be designed such that the blade can only be placed in a defined
position (see Figures 5 and 9).
5.2.4.1.3 At the circumference of the rotating transport roller the point to point distance of the tooth grooves shall be
< 2,5 mm and the groove depth < 2,0 mm. The grooves shall not have circumferential passes (see Figure 20).
Key
1 Transport roll without grooves
2 Transport roll with grooves
Figure 20 — Membrane removal machine - safety measures of the transport roll
5.2.4.1.4 The operation switch for the drive of the transport roller shall be a hold-to-run control device. The
transport roller shall stop not later than 2 s, after the operator has stopped to actuate the operation switch (see
5.3.1). This switch can be e.g. foot, knee or belly operated and shall be protected against unintentional actuation.
5.2.4.1.5 Safety requirements:
for the normal machine installation in a small working area (see 5.2.1.1.5, paragraph 2 and Figure 10)
for the normal machine installation in a working area with a cutting line (see 5.2.1.1.5, paragraph 2 and
Figure 11)
for further installation (see 5.2.1.1.6 and Figure 12)
5.2.4.1.6 Normal operating conditions
Open membrane removal machines shall only be used in conjunction with the removal of skin or membrane from
flat and round products.
5.2.4.1.7 Wearing of protective gloves
When operating an open membrane removal machine, the operator shall only wear manufacturer approved
protective gloves. Metal wire mesh gloves, or metal wire reinforced gloves shall not be worn (see 7.1.d).
On open membrane removal machines a permanently fixed notification shall be present, with the following text:
“Attention: Do not wear metal wire mesh gloves or metal wire reinforced gloves”.
5.2.4.1.8 Operator training
The manufacturer shall devise safe working procedures to be followed by operators. These shall be included in the
instructions for use (see 5.2.4.1.9), together with the elements of training and frequency of retraining to be given to
the operators.
5.2.4.1.9 Information in the instruction handbook
The manufacturer shall describe clearly:
the normal installation of the machine in small working areas (see 5.2.4.1.5, paragraph 1);
the normal installation of the machine in a working area with cutting line (see 5.2.4.1.5, paragraph 2);
the installation of the machine in further installation ( see 5.2.4.1.5, paragraph 3);
the normal operating conditions for membrane removal machines (see 5.2.4.1.6);
the wearing of protecting gloves (see 5.2.4.1.7);
the operator training before starting work (see 5.2.4.1.8).
5.2.4.2 - Zone 2
The access to the entanglement zone (point) between the rotating transport roll and the stripper roll shall be
prevented. This can be achieved e.g. by observance of the following measures:
5.2.4.2.1 The direction of rotation of these rolls, the form of the grooves of the stripper roll and the circumferential
velocity of the rolls shall not form an entanglement hazard.
5.2.4.2.2 Alternatively if an entanglement hazard occurs, a guard (e.g. guard cover) shall be provided. The guard
shall be removable and interlocked.
5.2.4.2.3 Requirements of interlocking shall be according to 5.2.
5.2.4.3 - Zone 3
The access to the entanglement zone between the rotating tooth roll and fixed machine parts or air jet cleaning
device shall be prevented. This can be achieved e.g. by observance of the following measures:
Safety requirements see 5.2.1.4.
5.2.5 Automatic membrane removal machines
On automatic skinning- and membrane removal machines the safety requirements shall apply with 5.2.2.
5.2.6 Drive system
Zone 8
The access to the danger points on the drive system shall be prevented. This can be achieved e.g. by observance
of the following measures:
5.2.6.1 At the drive system guards (e.g. doors) shall be provided according to 3.2 of EN 953:1997. The guards can
be fixed or removable and interlocked.
5.2.6.2 If guards have to be removed for changing the machine operation or cleaning, these guards shall be
interlocked.
Requirements for interlocking of guards see 5.2.
5.3 Electrical hazards
The electrical equipment shall comply with EN 60204-1.
5.3.1 Stopping function of switching devices
The stopping function of switching devices shall be in accordance with 9.2.2, category 0 of EN 60204-1.
5.3.2 Emergency stop-device
Installation of an emergency stop on individual machines may be dispensed because no hazard is present which
requires an emergency stop. The usual OFF switch shall be easily reachable from the operator position.
5.3.3 Protection against water ingress
5.3.3.1 IP degrees of protection
Electrical operating components shall comply with the following degrees of protection in accordance with
EN 60529:
IP X5 External electrical operating components:
on the machine;
on the control box on the machine;
on the control box located in the process room.
IP X3 Internal electrical operating components:
in the machine with enclosed housing with the degree of protection IP X5 and open lower
surface;
protection against direct and indirect impact of a water jet shall be assured e.g. by a hood.
IP X2 Internal electrical operating components:
in a machine with completely enclosed housing with the degree of protection IP X5. Protection
against condensate water shall be provided e.g. by a hood;
in the control box enclosure.
IP X0 Internal electrical operating components:
in a machine with completely enclosed housing with the degree of protection IP X5. Protection
against condensate water shall be provided and assurance that fingers and back of the hands
cannot contact live points by the design of the electrical device according to EN 60529.
5.3.3.2 Hoods
If derinding-, skinning- and membrane removal machines are foreseen to be cleaned with pressurized water,
ingress of water into the external electrical operating componen
...