​Bonding Quality of plywood

2018-07-31 17:50:56 Japan plywood 1933

Bonding Quality of plywood

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Article 3 Criteria for the bonding quality of plywood shall be as follows:

1.For Type Special, the plywood product shall meet the requirement of either (1), (2) or (3) (limited to those consist of softwood veneers only) of all of the followings:

(1)As the results of Continuous Boiling Test specified in 3(2) of the Appendix, the average wood failure ratio and shear strength shall be not less than the values provided in Table (1). In this case, for layers with its fiber direction mostly parallel to that of the adjacent veneers (hereinafter, referred to as ‘parallel layer’), the length of non‐delaminated portion on the same bonding layer of the specimen shall be not less than 2/3 of the length of each side.

(2)As the results of Cyclic Steaming Test specified in 3(2) of the Appendix, the average wood failure ratio and shear strength shall be not less than the values provided in Table (1). In this case, for the parallel layers, the length of non‐delaminated portion on the same bonding layer of the specimen shall be not less than 2/3 of the length of each side.

(3)As the results of Vacuum Pressure Test as specified in 3(2) of the Appendix, the specimens shall meet the following conditions from a. to c. In this case, for the parallel layers, the length of non‐ delaminated portion on the same bonding layer of the specimen shall be not less than 2/3 of the length of each side.

a.The average wood failure ratio of all test specimens shall be not less than 80%.

b.The number of test specimens with the wood failure ratio of 60% or greater shall be not less than 90%.

c.The number of test specimens with the wood failure ratio of 30% or greater shall be not less than 95%.

2.For Type I, the plywood product shall meet the requirement of either (1), (2) or (3) (limited to Concrete forming plywood consists of softwood veneers only) of all of the followings. However, for Surface processed concrete forming plywood, Natural wood decorative plywood, Specially processed decorative plywood and Special core plywood (referring to the plywood with other than ‘veneer core’, hereinafter the same), as the results of Type I Immersion Delamination Test specified in 3(3) of the Appendix, the length of non‐delaminated portion on the same bonding layer of the specimen shall be not less than 50mm at each side.

(1)As the results of Cyclic Boiling Test specified in 3(2) of the Appendix, the average wood failure ratio and shear strength shall be not less than the values provided in Table (1). In this case, for the parallel layers, the length of non‐delaminated portion on the same bonding layer of the specimen shall be not less than 2/3 of the length of each side.

(2)As the results of Steaming Treatment Test specified in 3(2) of the Appendix, the average wood failure ratio and shear strength shall be not less than the values provided in Table (1). In this case, for the parallel layers, the length of non‐delaminated portion on the same bonding layer of the specimen shall be not less than 2/3 of the length of each side.

(3)As the results of Vacuum Pressure Test as specified in 3(2) of the Appendix, the average wood failure ratio and shear strength shall be not less than the values provided in Table (1). In this case, for the parallel layers, the length of non‐delaminated portion on the same bonding layer of the specimen shall be not less than 2/3 of the length of each side.

3.For Type II of Plywood for General Use (except for the special core plywood), as the results of Hot and Cold Water Immersion Test specified in 3(2) of the Appendix, the average wood failure ratio and shear strength shall be not less than the values provided in Table (1). In this case, for the parallel layers, the length of non‐delaminated portion on the same bonding layer of the specimen shall be not less than 2/3 of the length of each side.

For Type II of Natural wood decorative plywood, Specially processed decorative plywood and Special core plywood, as the results of Type II Immersion Delamination Test specified in 3(3) of the Appendix, the length of non‐delaminated portion on the same bonding layer of the specimen shall be not less than 50mm at each side.

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Jiangsu Senso Building Materials Co.,Ltd. (SENSO) is one of largest manufacturer of plywood and related products in China, which was founded in 1995 with 6 subsidiaries. We are now enjoying 62 production lines of film faced plywood ,commercial plywood and LVL.......

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