Common manufacturing methods of plywood are common is the dry heat method, that is, after dry single board coating, put in the hot press glued into plywood. The main processes include log dashand and cross saw, wood section heat treatment, wood section fixation center and spin cutting, single board drying, single-board application of glue, slab slabs, slab pre-pressure, hot pressure, and a series of post-treatment. So, what are the classifications of plywood?
Here's a detailed description of it:
1, plywood panel tree species for the plywood tree species, in China, commonly used broad-leaved tree wood is birch, water willow, birch, poplar, birch, birch, yellow polo, maple, nanwood, wood, birch, commonly used conifer trees have pine, Yunnan pine, larch pine, spruce and so on.
2, plywood classification methods are many, can be classified according to tree species, such as broad-leaved tree plywood (birch plywood, tropical broad-leaved tree plywood, etc.), conifer tree plywood;
3, according to the use of points, can be divided into ordinary plywood and special plywood, ordinary plywood is adapted to a wide range of uses of plywood, special plywood is to meet the special purpose of plywood;
4, can be based on the water resistance and durability of the glue layer, in China, the common plywood is divided into climate-resistant plywood (I. plywood, with durable, hard-to-boil or steam treatment and other properties, can be used outdoors), water-resistant plywood (class II plywood, can be impregnated in cold water, or often short-term hot water impregnation, but not resistant to boiling),Moisture-resistant plywood (Class III plywood, resistant to short-term cold water impregnation, suitable for indoor use) and moisture-resistant plywood (IV plywood, used under the normal indoor, with a certain strength of plyceous).
5, according to the structure of plywood, can be divided into plywood, sandwich plywood and composite plywood, sandwich plywood for plywood with core, composite plywood for the core (or certain layers) by the material other than solid wood or single board, the two sides of the core usually have at least two layers of wood pattern vertical arrangement of single board.
6, according to the surface processing, can be divided into sanding plywood, scraping plywood, veneer plywood, pre-trimmed plywood, sanding plywood for the board by sanding machine sanding plywood, scraping plywood for the surface through the scraper scraper polished plywood, veneer plywood for the surface has been re-decorated single sheet, wood sheet, wood sheet, plastic sheet,
Resin film or metal sheet and other veneer materials, pre-finished plywood for manufacturing has been made of a special surface treatment of plywood, the use of no need to re-modify the plywood.
7, according to the shape of plywood, can be divided into flat plywood and molded plywood, molding plywood is already in accordance with the requirements of the product, in the mold will be directly pressed into a curved shape of plywood, for special needs, such as wall panels, ceiling corrugated plywood and chair back, hind legs and so on. 8, plywood is divided into three layers or multi-layer thin wood glue two parts, now the vast majority of the production of thin wood is rotating thin wood, often called single board usually with odd layers of single board, adjacent layer single board fiber direction perpendicular to each other, common triad, five-in-one, seven-in-one odd layer plywood, its outermost layer single board called surface plate, front surface plate called panel, The opposite plate is called the back plate, and the inner single plate is called the core plate or the midplate.
