What kind of glue does bamboo plywood use in general?
By using the manual blank, the blank is strictly divided according to the symmetrical principle, odd layer principle and the vertical texture of the adjacent layer bamboo. Bamboo panels are required to be made of good material, and bamboo pieces with lower material are used as backboard. Face and back of the bamboo chips outward oriented in core plate group tabasheer; blank, is toward the adjacent bamboo sheet are orderly arranged according to the bamboo chips, bamboo yellow alternate.
Pre pressure in order to prevent slab displacement is generated to heat press plate when caused by laminated core, seam defects before the blank after hot pressing, to slab preloading at room temperature, the material is glued into a whole.The hot pressing using heat bonding technology, the hot pressing temperature is about 140oC, the unit pressure of 2.5-3.0MPa, hot pressing time is calculated according to the sheet thickness, usually 1.1min/mm.In order to prevent the "bubbling" phenomenon, the three stage depressurization process is usually adopted in the later stage of hot pressing. The first paragraph from the work pressure down to "balance pressure", the second paragraph from "balance pressure" down to zero, the third section from zero to hot plate completed the opening.
The four roller coating machine soluble phenolic resin on bamboo roller gelatinize for water, 300-350g/ square meters (double). Adhesive can be added 1%--3% flour, soy flour and other fillers. The filling agent causes the bamboo sheet to form a gum film on the surface after gluing, which is difficult to produce flowing glue when hot pressing, and the brittleness of the adhesive layer can be improved after curing.
1. Preparation of thick bamboo strips with groovesThe large diameter bamboo was cut into bamboo segments, milled and then divided into 2-4 pieces, then milled to inner segment for cooking and softening, then heated and pressed on the upper pressure single layer press machine, and expanded the curved bamboo block into flat surface. Finally, after processing the double-sided planer, the thick without bamboo green bamboo bamboo.2. Setting dryingIn order to prevent the bamboo in the drying process, curl deformation makes the flat bamboo recovery force on the transverse elastic, compression technology and equipment must be used dry, wet bamboo is heated under pressure in pressure relief, out of the water and free shrinkage.
Water soluble phenolic resin adhesive is usually used. Water soluble phenolic resin adhesive is one of the most important types of insoluble phenolic resin adhesive. The component of free phenol content is low (usually <2.5%), less harm to human body, and a water soluble phenolic resin can save a large amount of organic solvent, easy cleaning in coating operation, so it is widely used in wood processing industry. The binder is mainly used for bonding wood.Bamboo plywood is made of bamboo with groove and equal thickness bamboo as its unit, and bamboo is made by rolling and planing. Bamboo plywood can be used as an ordinary structural board, and also can be used as the floor of a car by the length and surface treatment of sheet metal
