1、TAPPI/ANSI T 812 om-13 SUGGESTED METHOD 1970 OFFICIAL TEST METHOD 1980 REVISED 1985 REVISED 1992 REVISED 1997 REVISED 2003 REAFFIRMED 2008 REVISED 2013 2013 TAPPI The information and data contained in this document were prepared by a technical committee of the Association. The committee and the Asso
2、ciation 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 recent edition published. Approved by
3、 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 issues related to such use. The us
4、er 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 both, of chemicals which may pres
5、ent 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 potentially hazardous chemicals. Prior
6、 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 for safe use and disposal of these
7、 chemicals. Ply separation of solid and corrugated fiberboard (wet) 1. Scope This method describes a laboratory test for evaluating the resistance to ply separation of solid or corrugated fiberboard after exposure to water. It is intended primarily to distinguish between boards fabricated with weath
8、er-resistant adhesives and those with nonweather-resistant adhesives. 2. Significance The ability of a fiberboard shipping container to meet certain wet weather-resistance requirements is influenced by the resistance of the plies of the solid or corrugated fiberboard to separation after exposure to
9、water. An appraisal of the strength of the combining adhesive after a period of immersion in water is therefore one of the criteria for weather-resistant fiberboard shipping containers. 3. Apparatus 3.1 Corrosion-resisting tank, for holding water and test specimens, of suitable size so that water ha
10、s free access to all surfaces of each specimen. NOTE 1: The tank must be kept clean. 3.2 Rack, or other means for supporting the specimens vertically and keeping them separated from each other and from the sidewalls of the tank in such a manner that ply separation is not restricted. 3.3 pH meter and
11、 thermometer, to record pH and temperature. To be routinely calibrated using manufacturers procedures and recommendations. T 812 om-13 Ply separation of solid and corrugated fiberboard (wet) / 2 4. Materials Water, use tap or potable water maintained at a temperature of 23 3C (73 5F) with a pH betwe
12、en 6.5 and 7.5, drawn fresh for each batch of specimens. 5. Conditioning Preliminary conditioning. After manufacture precondition and condition the solid or corrugated fiberboard in accordance with TAPPI T 402 “Standard Conditioning and Testing Atmospheres for Paper, Board, Pulp Handsheets and relat
13、ed products.” For specific customer requests that require the preconditioning and conditioning steps to take place outside the time or temperature/humidity limits shown in T 402, the special preconditioning and/or conditioning procedures shall be listed in the 8.2.4 section of the Report. NOTE 2: Fo
14、r control purposes only, a quick test of the board at the time of manufacture may be made by placing it in an oven for 10-20 min at a temperature of 105C (221F) to accelerate the cure of the adhesive prior to cutting and submerging the test specimens. 6. Sampling and test specimens 6.1 From each tes
15、t unit obtained in accordance with TAPPI T 400 “Sampling and Accepting a Single Lot of Paper, Paperboard, Containerboard, or Related Product,” depending on lot size, cut 3-5 specimens, 150 x 250 mm (6 x 10 in.) in size, from undamaged, unscored, unprinted portions of the board. 6.1.1 Cut corrugated
16、fiberboard specimens so that the flute openings are along the 250-mm (10-in.) dimension. 6.1.2 If finished containers do not permit specimens of this size, use smaller size specimens. Some printing or a score near the middle of the specimen (not near an edge) is acceptable if unavoidable. 7. Procedu
17、re 7.1 Submerge the specimens vertically with the 250-mm (10-in.) edges horizontal and the top edge 25 mm (1 in.) below the surface of the water. Support the specimens so that the water has free access to all surfaces and ply separation, if it occurs, is not restricted. 7.2 Allow the specimens to re
18、main submerged for 24 1 h. NOTE 3: For reduced levels of (wet) weather or moisture resistant adhesives, reduced immersion times may be selected and so reported. 7.3 Remove the specimens from the water and continue to support them in a vertical position, allowing them to drain until their surfaces no
19、 longer glisten, and in the case of corrugated fiberboard allow any excess water to drain from the flutes. Also, for corrugated board samples, to assist in the removal of entrained water and air within the flutes, samples may be “tapped” or shaken after they are removed from the water. Fig. 1. Proce
20、dure for overcoming surface tension. 7.4 Immediately following drainage, check the specimens for adhesion between components. 3 / Ply separation of solid and corrugated fiberboard (wet) T 812 om-13 NOTE 4: Separation of components may occur spontaneously and freely during soaking; however, surface t
21、ension may often cause the wet components of fiberboard to cling together even though not bonded by adhesive. To overcome the surface tension, brush lightly with the ball of the thumb across the cut edges of the specimen at several points on both faces of each of the four edges, particularly the 250
22、-mm (10-in.) or machine direction edges. 8. Report 8.1 Report whether the specimen exhibited separation of the edges, and if so, the extent of separation expressed in millimeters (inches) of delamination measured inward from the edge of the specimen. 8.2 Report also the following: 8.2.1 Number of sp
23、ecimens tested. 8.2.2 Dimensions of the specimens, if not of standard size. 8.2.3 The temperature and pH of the water. 8.2.4 Any additional relevant information. 9. Precision A precision statement is not applicable to this qualitative method. 10. Keywords Corrugated boards, Fiberboards, Ply separati
24、on, Bonding strength 11. Additional information 11.1 Effective date of issue: November 5, 2013. 11.2 Significant changes were included in the 2008 revision: The conditioning atmosphere has been narrowed to TAPPI standards and the length of conditioning time has been reduced prior to cutting and subm
25、ersion of specimens. 11.3 Housekeeping changes were made to sections 5.1 and 7.3 in 2013. Reference ASTM D4727 “Standard Specifications for Corrugated and Solid Fiberboard Sheet Stock (Container Grade) and Cut Shapes.” Glue bond separation of weather-resistant and water and water-vapor resistant classes. (American Society for Testing and Materials) Your comments and suggestions on this procedure are earnestly requested and should be sent to the TAPPI Standards Department.
