Production method of modified wood, bamboo glued mould

Abstract

The invention discloses a method for manufacturing modified plywood formwork of wood or bamboo wood. The method is implemented by the following steps: small-diameter cotton-wood, China fir or small-diameter mixed bamboo instead of large-diameter high-quality wood and large-diameter moso bamboo are taken as raw materials to process into wood wool and bamboo filaments; soluble phenolic resin with a solid content of 20 to 30 percent is used as a modifier of the material; the phenolic resin is impregnated in the fiber cell lumens of the material by a pressure impregnation method to change the moisture expansion property of the material; the wood wool or the bamboo filaments containing less than or equal to 15 percent of water is used as assembly materials; modified and dried wood wool or bamboo filaments and paper impregnated with phenolic resin are used as assembly materials for plywood, and an assembly structure is a three-layer composite structure; main parameters of thermo-compression and bonding include: a unit pressure of 40 to 50 kg / cm<2>, a bonding temperature of 150 + / -10 DEG C, thermo-compression time of one minute for each millimeter of the thickness of board; the board is unloaded when cooled to less than or equal to 50 DEG C after thermo-compression and bonding and is subjected to edge cutting to be processed to the plywood; and after the worn surface finish of the plywood is restored through recoating by a secondary veneering method, the plywood is reused.

Description

Technical field: [0001] The invention relates to a method for making artificial boards, in particular to a method for making modified wood and bamboo glued templates. Background technique: [0002] At present, wood-based panels are mainly used as templates in the construction industry, multi-layer plywood made of wood and multi-layer bamboo plywood made of bamboo. The manufacturing method of these two types of plywood is to use large-diameter high-quality wood and large-diameter moso bamboo as raw materials, and process them into sheet-like wood veneers or bamboo curtains and bamboo mats of a certain size, and then use them as the base material of the board. , using phenolic resin as an adhesive to coat or dip in the surface of the sheet base material, and then form the blank according to the method of vertical, horizontal and vertical intersection, and then process it into a plywood by pre-pressing and hot-pressing. The surface of the two kinds of plywood can use phenolic ...

AI Technical Summary

Problems solved by technology

[0003] In the production process of the above two kinds of plywood, the adhesive is coated or dipped on the surface of the sheet material, that is, the surface of the base material of the wood veneer or bamboo curtain or bamboo mat. The chemical and physical forces glued the slabs into a whole board, which did not change the wet swelling properties of wood and bamboo. Therefore, under the condition of wet concrete operation, the water in the concrete is absorbed by the board and the sheet. As the wood bamboo or wood gradually absorbs, the moisture content of the board increases, the static bending strength and elastic modulus of the main mechanical indicators of the formwork decrease accordingly, and the board expands and deforms, resulting in the scrapping of the board and the phenomenon of unqualified engineering quality and Quality accidents, even if there is a film-coated material on the surface of the board, the effect of repeated turnover of the board cannot be achieved due to the deformation and scrapping of the board during use. This common problem in both wood and bamboo glued formwork illustrates the current The defects existing in the two traditional manufacturing methods of templates should be changed