RU1818253C - Process of producing of pencil small planks - Google Patents

Abstract

SUMMARY OF THE INVENTION: A pencil plaque is obtained from various wood species by peeling churaks on veneers with a finished sheet thickness of 1.0-3.0 mm. For refinement, a batch of peeled veneer of the same breed and the same thickness is selected and heat treatment is carried out with simultaneous paraffin impregnation at 180-250 ° C for 0.5-60 minutes. The veneered veneers are sorted, chined and treated with adhesive. A packet of a given thickness is formed, glued and cut into planks. 1 tab.

Description

The invention relates to the woodworking industry and can be used in pencil manufacturing.

The purpose of the invention is to increase the yield of planks while improving the ginning properties,

The method is carried out as follows.

A pencil board is obtained from both coniferous and hardwood (spruce, pine, fir, aspen, birch, etc.). Preparation of raw materials for peeling is carried out in the usual way (boiling, cutting into churaki, debarking). Peeling of churaks is carried out on peeling machines. The thickness of the finished veneer sheets is 1.0-3.0 mm. The veneer strips are cut on guillotine shears to a predetermined format. At the same time, veneer pieces are cut and trimmed. When sorting and selecting raw format veneers, veneer parameters, wood defects and defects are taken into account. For refinement, a batch of peeled veneer of the same breed and the same thickness is selected. The raw veneer is refined by heat treatment with simultaneous impregnation in paraffin at a temperature of 180-250 ° C for 0.5-60 minutes. The refinement process can be carried out both continuously and periodically (in bathtubs of continuous or periodic type) on a single sheet or in containers. Refined veneer sorted. An interline interval that has processing defects and dropped knots is repaired, closing all knots and crack cracking. The veneer is glued with a gummed tape on rib gluers for longitudinal gluing. The surface of the veneer is treated with adhesive. As the adhesive composition, any adhesive composition used in the woodworking industry can be used, for example, PVA, urea-formaldep / Gd-KF-MT resin and hardener, oxalic acid, their mixture or albumin.

(L

WITH

00

00 N3 O1 CO

The veneered veneered places are laid in a package symmetrically to the central plane, while the number of veneer sheets in the package must be even, and the sheets themselves have the back to the back and the front to the front, with the same fiber direction in all layers. The bag is glued to the layered material in a cold or hot state (depending on the adhesive composition) in presses used to make sheet or plate materials.

The glued laminated material is kept in tight feet for 5 days, cut onto a board on special equipment used for cutting board and sheet materials, sorted and packaged. The proposed method for making a board is illustrated by the examples given in the table. The cutting force is determined in a wood cutting force research apparatus.

As can be seen from the data in the table, the proposed method allows

0

in comparison with cedar, reduce the cutting force by 15–20 N. replace cedar wood with a less scarce and expensive raw material. In addition, the proposed method allows to increase the yield of a pencil board by 10-20%.

Formula izobreten and A method for producing a pencil plaque, including peeling chunks on the veneer with its subsequent cutting and sorting, characterized in that, in order to increase the yield of the plank while improving the reproductive properties of the Karan5 dasha, the veneer is produced with a finished thickness 1.0-3.0 mm, sorted veneer is ennobled by heat treatment with simultaneous impregnation in paraffin at 180-250 ° C for 0.5-60 minutes, treated with adhesive composition, a package of a given thickness is formed, glued and cut t on the board.

180 200 220 230

10 30 60 1) 5

PVA UNDER PVL UNDER

Number of sheets

tone package, pcs 3 2 46 C

Package thickness, mm 6.0 6.0 6.0 6.0 6.0

260

0.3

UNDER 170 6.5 PVL

125 180-300

that

2 6.0

6.1

1 6.1