1、TAPPI/ANSI T 512 sp-12 SUGGESTED METHOD 1969 OFFICIAL STANDARD 1975 OFFICIAL TEST METHOD 1981 REVISED 1986 REVISED 1991 STANDARD PRACTICE 1996 REVISED 2002 REAFFIRMED 2007 REVISED 2012 2012 TAPPI The information and data contained in this document were prepared by a technical committee of the Associ
2、ation. The committee and the Association assume no liability or responsibility in connection with the use of such information or data, including but not limited to any liability under patent, copyright, or trade secret laws. The user is responsible for determining that this document is the most rece
3、nt edition published. Approved by the Standard Specific Interest Group for this Test Method TAPPI CAUTION: This Test Method may include safety precautions which are believed to be appropriate at the time of publication of the method. The intent of these is to alert the user of the method to safety i
4、ssues related to such use. The user is responsible for determining that the safety precautions are complete and are appropriate to their use of the method, and for ensuring that suitable safety practices have not changed since publication of the method. This method may require the use, disposal, or
5、both, of chemicals which may present serious health hazards to humans. Procedures for the handling of such substances are set forth on Material Safety Data Sheets which must be developed by all manufacturers and importers of potentially hazardous chemicals and maintained by all distributors of poten
6、tially hazardous chemicals. Prior to the use of this method, the user must determine whether any of the chemicals to be used or disposed of are potentially hazardous and, if so, must follow strictly the procedures specified by both the manufacturer, as well as local, state, and federal authorities f
7、or safe use and disposal of these chemicals. Creasing of flexible packaging material paper specimens for testing 1. Scope This standard practice describes a creasing procedure for tests requiring creased specimens of flexible packaging materials made of paper or paper-based materials. In most instan
8、ces, it is advantageous to compare the results of the creased specimens with those of uncreased specimens. This standard practice is not applicable to board grades (those exceeding 0.25 mm 0.01 in. in thickness). 2. Significance The diagonal creasing procedure more realistically simulates the manner
9、 of creasing during converting operations than the static loading devices. 3. Apparatus 3.1 Creasing surface or bedplate, consisting of a flat, rectangular plate; e.g., a piece of machined, smooth, metal plate with a flatness of 0.13 mm (0.005 in.) within 300 mm (12 in.), approximately 6 mm (0.25 in
10、.) thick or an equivalent piece of plate glass. The width and length are required to be at least 25 mm (1 in.) longer than the specimen size. 3.2 Creasing roller1, weighing 2.04 kg 0.04 (4.5 0.1 lb) with a rubber cover approximately 6 mm (0.25 in.) thick and having a Shore A Durometer hardness of 75
11、 5. The dimensions of the roller are 95 5 mm (3.75 in.) diameter and 45 5 mm (1.75 in.) wide. A handle is so attached at the axis of the roller that it can be used without additional pressure being applied by the operator. 1Names of suppliers of testing equipment and materials for this method may be
12、 found on the Test Equipment Suppliers list, available as part of the CD or printed set of Standards, or on the TAPPI website general Standards page. T 512 sp-12 Creasing of flexible packaging material paper specimens for testing / 2 NOTE 1: If a glass plate is used, it is advisable to have a size a
13、t least 200 mm (8 in.) square to prevent the edges from being chipped by the roller used in creasing the specimen. 4. Sampling and test specimens From each test unit of the material obtained in accordance with TAPPI T 400 “Sampling and Accepting a Single Lot of Paper, Paperboard, Containerboard, or
14、Related Product,” cut square specimens of the number and size required for the applicable test and with the principal directions parallel to the cut edges. NOTE 2: Unlike static loading procedures (e.g., TAPPI T 465 “Static Creasing of Paper for Water Vapor Transmission Tests”) where a weight and tw
15、o plane surfaces are used to make the crease, the effectiveness of the creasing is independent of the size of the specimen or the length of the crease. 5. Procedure 5.1 Condition the specimens in an atmosphere in accordance with TAPPI T 402 “Standard Conditioning and Testing Atmospheres for Paper, B
16、oard, Pulp Handsheets, and Related Products.” 5.2 While wearing latex gloves, make two diagonal creases on each specimen as follows: bring two of the opposite corners of the specimen together, thus inducing a fold along a diagonal; place the specimen on the creasing surface, and, while holding the c
17、orners, place the creasing roller on one end of the fold and roll it once along the fold, taking care not to apply additional pressure (see 3.2) at a rate of 25 12 mm/s (1 in./s) to form a crease. Unfold the specimen, then lightly refold it along the other diagonal, but with the reverse side folded
18、in, and again crease it with the roller. Finally unfold the test specimen. 5.3 The specimens are now ready to be tested for the penetration of or permeability to grease, gases, or other fluids. 6. Precision A precision statement is not applicable to this standard practice. 7. Keywords Creasing, Flex
19、ible packaging, Paper, Samples, Sample preparation 8. Additional information 8.1 Effective date of issue: November 1, 2012. 8.2 The 1981 version included an explanation of the relationship to other creasing methods. 8.3 This method was first published in 1969 as a Suggested Method and became an Offi
20、cial Method in 1975. In 1996, it was reclassified as a Standard Practice. 8.4 Related methods: ASTM F119 “Grease Penetration of Flexible Barrier Materials (Rapid Method),” American Society for Testing and Materials, Philadelphia, PA; TR 14, Flexible Packaging Association; MIL-B-121E, Military. Your comments and suggestions on this procedure are earnestly requested and should be sent to the TAPPI Standards Department.
