EN 1417:1996+A1:2008

SLOVENSKI STANDARD
01-november-2008
Stroji za predelavo gume in plastike - Valjarji - Varnostne zahteve
Plastics and rubber machines - Two roll mills - Safety requirements
Kunststoff- und Gummimaschinen - Walzwerke - Sicherheitsanforderungen
Machines pour les matières plastiques et le caoutchouc - Mélangeurs à cylindres -
Prescriptions de sécurité
Ta slovenski standard je istoveten z: EN 1417:1996+A1:2008
ICS:
83.200 Oprema za gumarsko Equipment for the rubber and
industrijo in industrijo plastics industries
polimernih materialov
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 1417:1996+A1
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2008
ICS 83.200 Supersedes EN 1417:1996
English Version
Plastics and rubber machines - Two roll mills - Safety
requirements
Machines pour les matières plastiques et le caoutchouc - Kunststoff- und Gummimaschinen - Walzwerke -
Mélangeurs à cylindres - Prescriptions de sécurité Sicherheitsanforderungen
This European Standard was approved by CEN on 16 August 1996 and includes Amendment 1 approved by CEN on 8 June 2008.

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 CEN 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 CEN Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, 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
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1417:1996+A1:2008: E
worldwide for CEN national Members.

Contents Page
Foreword.3
Introduction .4
1 Scope .4
2 Normative references .5
3 Definitions .6
4 List of hazards.8
5 Safety requirements and/or measures .11
6 Verification of the safety requirements and/or measures .19
7 Information for use .21
Annex ZA (informative) !!!!Relationship between this European Standard and the Essential
Requirements of EU Directive 98/37/EC"""".23
Annex ZB (informative) !!!!Relationship between this European Standard and the Essential
Requirements of EU Directive 2006/42/EC"""".24

Foreword
This document (EN 1417:1996+A1:2008) has been prepared by Technical Committee CEN/TC 145 “Plastics
and rubber machines”, the secretariat of which is held by UNI.
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 February 2009, and conflicting national standards shall be withdrawn
at the latest by December 2009.
This document includes Amendment 1, approved by CEN on 2008-06-08.
The main changes compared to the previous version are:

• Modification of the main element of the title
• Editorial modification of Annex ZA
• Addition of Annex ZB
• editorial changes of EN 292-1:1991 to EN ISO 12100-1:2003 and of EN 292-2:1991 to EN ISO 12100-
2:2003 in the following clauses: Introduction, 2 and sub-clauses: 5.1.1.1, 5.1.1.2, 5.1.1.3, 5.1.1.4.6,
5.1.2.2, 5.2.1, 5.8, 7.1.1
• minor changes of Foreword, 7th paragraph and of sub-clause 7.2.1, 2nd and 3rd indents
• technical change of sub-clause 7.1.1, last indent.

This document supersedes EN 1417:1996.
The start and finish of text introduced or altered by amendment is indicated in the text by tags ! ".
This European Standard 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 Annexes ZA and ZB, which are integral parts of this
document."
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and United Kingdom.
Introduction
This European standard is a type C standard as defined in !EN ISO 12100" and has been elaborated by
CEN/TC145/WG4.
The extent to which hazards are covered is indicated in the scope of this standard. In addition, machinery
shall comply as appropriate with !EN ISO 12100" for hazards which are not covered by this standard.
1 Scope
This standard covers the essential health and safety requirements for all two roll mills for the processing of
rubber and plastics. Significant hazards are listed in clause 4 and are covered by this standard.
Figure 1 shows the principal parts of a two roll mill.
This standard does not cover requirements for the design of an exhaust system.
This standard applies to two roll mills which are manufactured after the date of issue of this standard.
Key:
1 Frame       6 Stock blender
2 Mill rolls       6.1 Stock blender rolls
3 Drive and transmission unit    6.2 Stock blender carriage
4 Stock guides      7 Mill tray
5 Strip cutting device
Figure 1 — Principal parts of a two roll mill
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
below. For dated references, subsequent amendments or revisions of these publications apply to this
European Standard only when incorporated in it by amendment or revision. For non-dated references, the
latest edition of the publication referred to applies.
!deleted text"
EN 294:1992, Safety of Machinery - Safety distances to prevent danger zones being reached by the upper
limbs
EN 349:1993, Safety of Machinery - Minimum gaps to avoid crushing of parts of the human body
EN 418:1992, Safety of Machinery - Emergency stop equipment, functional aspects – Principles for design
EN 563:1994, Safety of Machinery – Temperature of touchable surfaces – Ergonomic data to establish
temperature limit values for hot surfaces
!EN 574:1996, Safety of machinery - Two-hand control devices - Functional aspects - Principles for
design"
!EN 953:1997, Safety of machinery - Guards - General requirements for the design and construction of
fixed and movable guards"
EN 1088:1995, Safety of Machinery - Interlocking devices with and without guard locking – General principles
and provisions for design
prEN 50100-1:1994, Safety of Machinery – Electro-sensitive protective systems – Part 1: General
requirements and tests
EN 60204-1:1992, Safety of Machinery – Electrical equipment of machines – Part 1: General requirements
!EN ISO 12100-1:2003, Safety of machinery - Basic concepts, general principles for design - Part 1: Basic
terminology, methodology (ISO 12100-1:2003)
EN ISO 12100-2:2003, Safety of machinery - Basic concepts, general principles for design - Part 2: Technical
principles (ISO 12100-2:2003)"
3 Definitions
For the purposes of this standard, the following definitions apply:
3.1
two roll mill
a machine with two counter-rotating cylinders (known as mill rolls) which are not covered, which may be
smooth or grooved, and whose axes are on substantially the same horizontal plane (see figure 1)
3.2
principal crushing zone
zone extending over the full length of the mill rolls indicated by V in figure 2
Figure 2 — Principal crushing zone V, safety limits S and specified stopping angle α
3.3
stopping angle
the following stopping angle definitions are related to two roll mills equipped with a mechanically actuated trip
device in the form of a bar (trip bar).
The stopping angle α is the angle through which the mill rolls rotate from the actuation of the trip bar until the
rolls have come to rest.
3.3.1
specified stopping angle αααα
The stopping angle specified by the machine manufacturer (see figure 2), related to the following conditions:
 Machine unloaded;
 Machine running at maximum speed.
3.3.2
Maximum stopping angle αααα
max
The upper limit value of the stopping angle
3.3.3
Measured stopping angles αααα
m
Stopping angles measured in order to compare with:
 α under the conditions given in 3.3.1;
 α under the same conditions and, in addition, power assisted braking (if existing) inoperative
max
(simulation of a power failure).
These measured braking angles are intended to verify the state of the braking system.

3.4
safety limit
this definition applies only to two roll mills equipped with a trip bar. The safety limit is the vertical plane
indicated by line S in figure 2 demarcating the zone which is unsafe for operators who can reach into it without
actuating the trip bar.
3.5
stock guide (also known as "ear")
a part which prevents material in process from going beyond the mill roll end (see figure 1, location 4)
3.6
strip cutting device
a device, equipped with rotating or stationary blades, to cut off strips of the material from a mill roll (see figure
1, location 5)
3.7
stock blender
equipment used to continuously recirculate the material in process to obtain a uniform mixing, distributing it
with a reciprocating motion along the length of the mill rolls (see figure 1, location 6).
3.8
mill tray
equipment for catching material which falls under the mill rolls (see figure 1, location 7)
3.9
recovery conveyor belt
equipment for recirculating material which falls under the mill rolls (see figure 3c)
3.10
retractable plough
equipment which can be moved towards the mill roll in order to cut and turn over the material, and which can
be retracted (see figure 3b).
4 List of hazards
The locations of the hazards in 4.1 and 4.2 are shown in figure 3.
4.1 Mechanical hazards related to the mill rolls
4.1.1 Hazards of drawing-in and crushing between the mills rolls during normal (forward) operation
4.1.2 Hazard of drawing-in and crushing between the mill rolls during reverse operation
4.1.3 Hazard of drawing-in and crushing between the stock guides and the mill rolls
4.1.4 Hazards resulting from loss of braking efficiency
4.2 Mechanical hazards related to equipment as defined in clauses 3.6 to 3.10
4.2.1 Hazard of cutting hazard from the blades of the strip cutting device
4.2.2 Hazard of crushing between the stock blender carriage and the machine frame
4.2.3 Hazard of drawing-in and crushing between the stock blender rolls
4.2.4 Hazard of drawing-in and crushing between the recovery conveyor belt and the mill roll, when the rolls
are in reverse motion
4.2.5 Hazard of impact due to the ejection of the mill tray
4.2.6 Hazard of drawing-in and crushing between the retractable ploughs and the mill roll

Figure 3a — Two roll mill shown with strip cutting device and stock blender

Key
1 Rest position
2 Working position
Figure 3b — Two roll mill with retractable ploughs Figure 3c — Two roll mill with recovery conveyor
belt
Figure 3 — Location of mechanical hazards
4.3 Hazards due to failure of the control system
4.4 Electrical hazards
Electrical shock or burns caused by direct or indirect contact with live conductive parts.
4.5 Thermal hazards
Burns and/or scalds caused by unintentional contact with hot machine parts or hot material.
4.6 Hazards caused by gases, dusts or vapours hazardous to health
Contact with and/or inhalation of harmful substances which may be released from the materials processed.
4.7 Hazards generated by neglecting ergonomic principles
4.8 Hazards generated by noise
Hearing impairment caused by noise. The principal noise sources are the drive and transmission unit(s) and
the bursting of air bubbles in certain materials being processed.
5 Safety requirements and/or measures
5.1 Mechanical hazards related to the mill rolls
5.1.1 Hazard of drawing-in and crushing between the mill rolls during normal (forward) operation
Access to the principal crushing zone, as defined in 3.2, shall be prevented by one or more of the following:
5.1.1.1 Fixed guards (see !!!!EN ISO 12100-1:2003, 3.25.1"""" and figure 4 of this standard)
These guards shall be designed in accordance with !EN 953:1997", 3.2.2 and positioned according to
EN 294 Tables 2 and/or 4.
5.1.1.2 Interlocking guards or interlocking guards with guard locking (see !!EN ISO 12100-1:2003,
!!
3.25.4 or 3.25.5"""" and figure 4 of this standard)
The selection of these types of guards shall be made in accordance with EN 1088:1995, 7.4. These guards
shall be designed in accordance with !EN 953:1997, 3.5 or 3.6" and positioned according to EN
294:1992 Tables 2 and/or 4.
5.1.1.3 Mechanically actuated trip devices (see !!!!EN ISO 12100-1:2003, 3.26.5"""") in the form of a
hinged guard (see figure 4)
These devices, designed for involuntary actuation by the hand, shall meet the following requirements:
 They shall extend over the full length of the mill rolls;
 Actuation shall stop the movement of the mill rolls, stopping time shall be smaller than access time (see
EN 1088:1995, 3.8 and 3.9);
 Openings in these devices shall not allow access to the principal crushing zone (see EN 294:1992, table
4);
 Actuation of the trip devices shall not require a force greater than 25N;
 Actuation shall not cause separation or reversal of the mill rolls.
NOTE These requirements can generally be achieved only on the smaller type of two roll mills
Key
1 Fixed guard
2 Interlocking guard
3 Mechanically actuated trip device in the form of a hinged guard
Figure 4 — Examples of guards and a mechanically actuated trip device in the form of a hinged guard
5.1.1.4 Mechanically actuated trip devices in the form of a bar (see figure 5)
5.1.1.4.1 Prerequisites for the installation of this type of device
a) Installation of the machine
The top of the mill rolls shall be at a height of not less than 1300mm above the normal standing level of the
operator (see 7.1.2)
b) Braking system
 The maximum stopping angle α shall be 1 radian (57,3°);
max
 The specified stopping angle α shall not exceed α ;
0 max
 The mill rolls shall come to rest in an angle not greater than α after actuation of the trip bar;
 The mill rolls shall automatically come to rest in an angle not greater than α in the event of a power
max
failure.
NOTE If these requirements cannot be fulfilled see 5.1.1.4.7.
c) Measuring device
These two roll mills shall be equipped with a device for measuring the stopping angles (see 7.1.2).
5.1.1.4.2 Positioning of the trip bar
 The trip bar shall extend over the full length of the rolls
 It shall be positioned as follows:
a) A fixed height (a) of 1150mm above the operator's normal standing level (see figure 5)
b) A horizontal distance (b) between the nip and the bar in its switching position (see figure 5). The distance
b shall not be less than b which is calculated according
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