SU856851A1 - Method of pressing chip-wood boards - Google Patents

Description

(54) METHOD FOR PRESSING WOOD-BODY

PLATE

t

The invention relates to woodworking and can be used in the manufacture of chipboard.

A known method of pressing chipboard by flat pressing in multi-floor presses 1.

There is also known a method of pressing chipboard plates, which includes the production of chip-adhesive mass, the formation of chipboard bags, cold prepressing, hot pressing in a high-rise press, trimming and grinding of plates. At the same time, between the plates of the press, only one package is loaded, the cold prepressing is carried out at a pressure of 10-18 kgf / cm2 2.

The disadvantage of this method is that a further increase in the productivity of the hot press is possible only with an increase in the number of floors of the press, which is associated with the creation of new presses or with a significant modernization of sushi, with the increase of the height of the building.

The purpose of the invention is to increase productivity, reduce energy consumption and save wood and a binder.

The goal is achieved by the fact that the cold prepressing is carried out at

pressure of 20-22 kgf / cm2, and during hot pressing between the floors of the press at the same time at least two packages are placed, separated by a pallet.

The method is carried out as follows.

All technological operations prior to cold pressing: chopping wood, its wood, preparing a binder, mixing wood particles with a binder, forming chipboard bags remain unchanged. For maximum uplifting of the chip package, cold pressing is carried out at a specific pressure of 20-22 kg / cm. Then the packages on pallets are doubled in thickness (and the pallet of the upper package separates them) on the double transfer mechanism, which is additionally installed

15 and in pairs loaded into an existing boot shelf. After filling all the floors, all the packages are simultaneously loaded into the spans of a hot press, in which the spacer bars are installed on a double plate thickness. Auxiliary operations for loading and unloading do not change as these operations are not complicated. Thickness allowance for plate grinding remains

the former (1.5-2.0 mm), but it is divided into two plates, i.e. halved, saving wood and binder. The pressing time is calculated from the accepted values per 1 mm of plate thickness based on the total thickness of the pressed plates in each floor. Further operations and mechanisms applied for their implementation are not changed.

Experiments show:

1. Cold pressing of packages at a pressure of 20-22 xg / cm2 reduces the original thickness of the package by 3-3.5 times. For example, for a plate with a thickness of 17 mm, the initial thickness of the bag is about 85 mm, after pressing it is reduced to 24 mm.

2. Physical and mechanical testing of plates pressed together on two brushes in the floor of the press is within the limits established by GOST 10632-77. For example, the tensile strength during static bending in plates with a thickness of 16 mm kg / cm; usr density 746kg / m.

The capacity of a 15-story press for pressing plates pressed together with two brushes in the floor of the press increases for plates, mm:

3500x1750; 9 11 ° / o

3500 1750x1613%

3500x1750x1315 / (

3500x1750x10from 19 to 26%

The annual economic effect only due to an increase in the removal of plates from one press in m is, rubles:

For slabs thick

3500x1750x19 mm 785000 16mm 916290

13 mm 981720 10 mm 112580-1570750 These figures do not take into account the savings from reduced energy costs, wood and a binder.

When using the proposed method in enterprises equipped with domestic presses (53 enterprises), with the release of plates with a thickness of 16 mm, the savings can be 48,563,000 rubles. per year or increase in production at 539593m.

Claims (2)

1. USSR author's certificate number 686896, cl. B 29 J 5/00, 1977. 2.Shvartsman GM. Production of chipboard. M., “Forest Industry, 1967, p. 178.