ASTM D3811/D3811M-21a

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D3811/D3811M − 21 D3811/D3811M − 21a
Standard Test Method for
Unwind Force of Pressure-Sensitive Tapes
This standard is issued under the fixed designation D3811/D3811M; the number immediately following the designation indicates the
year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last
reapproval. A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope
1.1 This test method covers one procedure for determining the force required to unwind a roll of pressure-sensitive tape.
1.2 The values stated in either SI or inch-pound units are to be regarded separately as standard. The values stated in each system
may not be exact equivalents; therefore, each system must be used independently, without combining values in any way.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
D996 Terminology of Packaging and Distribution Environments
D3715/D3715M Practice for Quality Assurance of Pressure-Sensitive Tapes
D4332 Practice for Conditioning Containers, Packages, or Packaging Components for Testing
E122 Practice for Calculating Sample Size to Estimate, With Specified Precision, the Average for a Characteristic of a Lot or
Process
3. Terminology
3.1 Definitions—General terms in this test method are defined in Terminology D996.
4. Summary of Test Method
4.1 The sample roll of tape is placed on a free-turning spindle held in a CRE (constant-rate-of-extension) tension tester. While the
crosshead is moved at a specified rate, the maximum force measured during unwinding of approximately 150 mm [6 in.] of tape
is taken as the unwind force.
This test method is under the jurisdiction of ASTM Committee D10 on Packaging and is the direct responsibility of Subcommittee D10.14 on Tape and Labels.
Current edition approved April 15, 2021Nov. 1, 2021. Published April 2021April 2022. Originally approved in 1979. Last previous edition approved in 20182021 as
D3811/D3811M – 96 (2018).D3811/D3811M – 21. DOI: 10.1520/D3811_D3811M-21.10.1520/D3811_D3811M-21A.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D3811/D3811M − 21a
5. Significance and Use
5.1 This procedure simulates hand and machine unwinding of tape at low rates. The force required for unwinding at low rates is
a function of rate. At some rate (expected to be different for each construction type and manufacturer) there occurs an inversion
of the response. The rate for this test method does not allow for comparisons of different tapes that will be unwound at high rates.
5.2 This procedure can be used to indicate satisfaction where a specification for unwind; either maximum, minimum, or mean;
is established and when the responses referred to in 5.1 are taken into consideration.
6. Apparatus
6.1 Unwind Force Tester—A CRE tension tester shall be used. The tester shall have two clamps with centers in the same plane,
parallel with the direction of motion of the stressing clamp, and so aligned that they will hold the specimen wholly in the same
plane; a means of moving the stressing clamp at a uniform rate of 5 6 0.2 mm/s [12.0 6 0.5 in./min]; and an autographic device
for recording load. The instrument shall be calibrated to an accuracy of 0.5 % full scale. The scale range used for any test shall
be such that the mean test level falls within 20 to 50 % of full scale.
6.2 Free-Turning Spindle, sized to fit snugly inside the sample tape core, with its axis horizontally supported in a frame that
can be held in the clamp on the crosshead of the unwind tester that is not supporting the load cell.
7. Sampling
7.1 Acceptance Sampling—Sampling shall be in accordance with Practice D3715/D3715M.
7.2 Sampling for Other Purpo
...