SU895661A1 - Method of producing plywood plates - Google Patents

Description

I

The invention relates to the woodworking industry, and. in particular, to the methods of production of plywood plates.

There is a method of gluing multilayer plywood, which includes the gluing of veneer glue, the formation of a package of spread and un-anointed veneer sheets and pressing 1.

There is also known a method of making plywood plates, which includes applying glue to veneer sheets, forming layers and a package, pressing it and pressing 2.

A disadvantage of the known methods is the high pressing cycle.

The purpose of the invention is to shorten the pressing cycle.

This is achieved in that the formation of at least one middle layer is carried out of veneer strips, which are laid during the formation of a package with a gap relative to each other.

The drawing shows a diagram of a plywood plate.

The plywood plate 1 includes longitudinal sheets of spike 2, transverse veneer sheets 3 spread with glue, and a middle layer 4 of

veneer strips 5, which are located with a gap of 6.

Under laboratory conditions, samples of plywood were manufactured by the known and proposed methods.

By a known method, a packet of birch veneer was collected, even sheets of which were smeared with carbamide resin at the rate of PO g / m after assembly, the bag was loaded into a press and kept at a pressure of 20 kg / cm and PO-P5 ° C, while seven or nine were made tee-eleven-layer samples of plywood plates.

According to the proposed method, a packet of birch shppon was assembled, in which two middle layers adjacent to the central longitudinal sheet of the spike 2 were formed from the strips of the spontaneous 5 50 mm wide with a gap 6 between them equal to 10 mm, while the transverse veneer sheets 3 were smeared with carbamide resin from calculating 110 g / m after assembly, the package was loaded into a press and kept at a pressure of 20 kg / cm and a temperature of 125-130 ° C.

Claims (2)

The table shows the data characterizing the manufacturing process of the above samples. The introduction of the ordered method allows pressing multilayer plywood boards, consisting of, and more veneer layers, in accelerated modes; i.e., to increase the productivity of the pressing equipment by 80% / bj. €, and also to save raw materials by using lumpy veneer. Claim method A method of making plywood plates, including applying glue to veneer sheets, forming layers and a package of its pressing and pressing, characterized in that, in order to shorten the pressing cycle, the formation of at least one middle layer of drying is made of veneer strips which stack when forming a package with a gap relative to each other. Sources of information taken into account during the examination 1. Handbook of veneer, M., Lesna industry, 1968, p. 256. 2. Technological instructions for the production of plywood, plywood boards and wood plastics. L., TsNIIF, 1970, p. 8, 9, (prototype).