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Quantitative test method for cold compressive strength of plywood embryos

A technology of cold-pressed strength and test method, applied in measuring devices, instruments, mechanical devices, etc., can solve the problems of disturbing the stability of the consolidated adhesive layer, difficulty in obtaining cold-pressing strength, etc., achieving easy standardized testing, convenient cutting, The effect of avoiding economic losses

Active Publication Date: 2016-05-11
XUYI HENGXIN CLAY TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the test specimen is prepared according to the national standard GB / T9846-2004 technical standard, during the sawing and grooving process of the specimen, the external force will inevitably disturb the stability of the unconsolidated adhesive layer; at the same time, the curing degree of the adhesive varies with the The dynamic process is continuously improved due to the prolongation of the storage time. If the sample preparation time is too long, the test cannot be completed within a limited time after pre-compression, and it will be difficult to obtain the real cold-compression strength test results.

Method used

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  • Quantitative test method for cold compressive strength of plywood embryos
  • Quantitative test method for cold compressive strength of plywood embryos
  • Quantitative test method for cold compressive strength of plywood embryos

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Cutting of the first test piece

[0031] Select the poplar veneer with no cracks and knots on the board surface and uniform thickness as the mother board of the test piece. The thickness of the mother board is 1.2mm. After the surface of the mother board is sanded by a sander, select two The mother boards belong to the same test group. According to the principle that the short side must be parallel to the direction of wood grain fibers and the long side is perpendicular to the direction of wood fibers, respectively cut the mother boards into test pieces 1 with a length and width of 300×100mm. Cut a slit 2 parallel to the short side every 25mm (A value) in the long side direction of one side of the test piece. The length of the slit 2 is about 75mm, and the uncut part keeps the test piece as a whole.

[0032] The second step of the pretreatment of the test piece

[0033] Number the cut test pieces, select one of the test pieces for each group, and paste two self-adhesiv...

Embodiment 2

[0042] Cutting of the first test piece

[0043] Select a basswood veneer with no cracks and knots on the board surface and uniform thickness as the mother board of the test piece. The thickness of the mother board is 0.8mm. The mother boards belong to the same test group. According to the principle that the short side must be parallel to the direction of wood grain fibers and the long side is perpendicular to the direction of wood fibers, cut the mother boards into test pieces with a length and width of 300×100mm. Cut a slit parallel to the short side every 40mm (value A) on one side of the test piece in the long side direction, the length of the slit is about 75mm, and the uncut part keeps the test piece as a whole.

[0044] The second step of the pretreatment of the test piece

[0045] Number the cut test pieces, select one of the test pieces for each group, and paste two self-adhesive tapes with a width of 15mm in parallel in the direction of the vertical gap, keeping the ...

Embodiment 3

[0054] Cutting of the first test piece

[0055] Select the birch veneer with no cracks and knots on the board surface and uniform thickness as the mother board of the test piece. The thickness of the mother board is 2.0mm. The mother boards belong to the same test group. According to the principle that the short side must be parallel to the direction of wood grain fibers and the long side is perpendicular to the direction of wood fibers, respectively cut the mother boards into test pieces with a length and width of 300×100mm. Cut a slit parallel to the short side every 10mm (A value) in the long side direction of one side, the length of the slit is about 75mm, and the uncut part keeps the test piece as a whole.

[0056] The second step of the pretreatment of the test piece

[0057] Number the cut test pieces, select one of the test pieces for each group, and paste two self-adhesive tapes with a width of 10mm in parallel in the direction of the vertical gap, keeping the width ...

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Abstract

The invention discloses a method for quantitatively testing the cold pressing strength of a plywood assembly. The method comprises the following steps: sanding a wood veneer as a motherboard, precutting to form a test piece, pasting with an adhesive tape, coating an adhesive, ageing, removing the adhesive tape, carrying out collaging combination, cold-pressing, cutting to form a plurality of test piece samples with symmetrical structure and unified dimension, carrying out stretching stress test on the above test piece in a limited time range, obtaining the bonding strength of each of the test pieces according to the stretching strength and the test piece adhesive tape area during the rupture of the test adhesive tape, and calculating the average value of the obtained test results, that is, the cold pressing strength. Tentative detection carried out before the mass production of plywood in a factory is used for determining that whether novel adhesives, fillers and production process parameters meet the batch production requirements of the plywood or not, and guiding the development of new materials and the optimization of plywood production process parameters.

Description

technical field [0001] The invention relates to the field of plywood production, in particular to a quantitative test method for the cold-pressed strength of plywood blanks, which provides quantitative basis for the development, research and industrial application of different types of wood boards, new adhesives and fillers used in plywood production, and guides the production of enterprises and improves scientific research efficiency. Background technique [0002] Because plywood has the characteristics of small deformation, large format, convenient construction, not easy to warp, anti-shrinkage, anti-cracking, high strength, high tensile strength of transverse grain, and exquisite finish, it is widely used in furniture, home decoration, building materials, vehicles, ships, packaging and many other industries. It is widely used in the industrial sector. Stimulated by huge market demand, my country's plywood industry has entered a period of rapid development since the early...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N19/04
Inventor 汤庆国翁卫东关雪阳刘晓冬王菲
Owner XUYI HENGXIN CLAY TECH