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A kind of plywood and hot pressing method thereof

A hot pressing method and plywood technology, applied in the field of wood processing and manufacturing, can solve the problems of unfavorable development of plywood enterprises, large slab compression ratio, increased production cost, etc., so as to shorten hot pressing time, improve sheet performance, and improve hot pressing. The effect of efficiency

Active Publication Date: 2021-02-26
BEIJING FORESTRY UNIVERSITY +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional hot-pressing process of plywood is stable for a period of time after one pressurization, and then the pressure is relieved step by step and maintained for a period of time respectively. However, most of the traditional processes have problems such as long hot-pressing time, large slab compression ratio, and slab explosive plates. It not only affects the production efficiency, but also increases the production cost, which is not conducive to the long-term development of plywood enterprises

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047]A kind of hot pressing method of plywood that present embodiment proposes, comprises the following steps:

[0048] 1) Apply glue to the veneer, assemble the billet, and after cold pressing, increase the pressure to 1.27MPa for the first time, set the hot pressing temperature to 145°C, and set the stabilization time of the first increase to 120s; the glue coating of the veneer The amount is 160g / m 3 The glue includes glue and flour, and the quality of the glue and common edible flour is 150kg and 50kg respectively; the glue is a lignin adhesive.

[0049] 2) After the initial depressurization to 0.4MPa, the steam exhaust time shall not exceed 6 times the stabilization time of the initial pressure increase; the stabilization time of the initial depressurization is 720s.

[0050] 3) Boost the pressure twice to 1.27MPa, and the duration is not longer than the stabilization time of the first boost. After the thickness of the slab is fixed, the pressure is released for the sec...

Embodiment 2

[0059] A kind of hot pressing method of plywood that present embodiment proposes, comprises the following steps:

[0060] 1) Apply glue to the veneer, assemble the billet, and after cold pressing, increase the pressure to 1.1MPa for the first time, set the hot pressing temperature to 110°C, and set the stabilization time of the initial pressure increase to 100s; the gluing of the veneer The amount is 160g / m 3 The glue includes glue and flour, the quality of the glue and common edible flour is 150kg and 50kg respectively; the glue is a urea-formaldehyde resin adhesive.

[0061] 2) After that, the pressure is released to 0.4MPa for the first time, and the steam exhaust time is not more than 6 times of the stabilization time of the initial pressure increase; the stabilization time of the initial pressure relief is 600s.

[0062] 3) Boost the pressure twice to 1.1MPa, and the duration is not longer than the stabilization time of the first boost. After the thickness of the slab is...

Embodiment 3

[0071] A kind of hot pressing method of plywood that present embodiment proposes, comprises the following steps:

[0072] 1) Apply glue to the veneer, assemble the billet, and after cold pressing, increase the pressure to 1.2MPa for the first time, set the hot pressing temperature to 130°C, and set the stabilization time of the initial pressure increase to 100s; the glue coating of the veneer The amount is 165g / m 3 The glue includes glue and flour, the quality of the glue and common edible flour is 150kg and 50kg respectively; the glue is a phenolic resin adhesive.

[0073] 2) After the initial depressurization to 0.4MPa, the steam exhaust time shall not exceed 6 times the stabilization time of the initial pressure increase; the stabilization time of the initial depressurization is 720s.

[0074] 3) Boost the pressure twice to 1.2MPa, and the duration is not longer than the stabilization time of the first boost. After the thickness of the slab is fixed, the pressure is releas...

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Abstract

The invention provides a plywood and its hot-pressing method. The hot-pressing method comprises the following steps: applying glue to the veneer, forming a billet, and after cold-pressing, boosting the pressure to 1.20‑1.30 MPa for the first time; then releasing the pressure for the first time to 0.3 ‑0.5MPa, the steam exhausting time is not more than 6 times of the initial boosting stabilization time; the second boosting to 1.20‑1.30MPa, the duration is not longer than the initial boosting stabilization time, after the thickness of the slab is fixed, the second pressure relief ; When the pressure is released to 0MPa for the second time, take out the plate. The hot-pressing method described in the present invention is a preferred hot-pressing mode for plywood under the synergy of multiple factors. By reducing the relative time of high pressure and efficiently discharging the moisture inside the slab, it not only effectively shortens the hot-pressing time and improves the hot-pressing efficiency, but also can Strengthen the performance of the board, reduce the compression rate of the board itself, so as to improve the utilization rate of wood.

Description

technical field [0001] The invention relates to a plywood which can improve the properties of the plywood board, increase the production efficiency and reduce the production cost and a hot pressing method thereof, belonging to the technical field of wood processing and manufacturing. Background technique [0002] Hot pressing is one of the most important links in the production process of plywood and one of the key factors affecting the quality of the board. The traditional hot-pressing process of plywood is stable for a period of time after one pressurization, and then the pressure is relieved step by step and maintained for a period of time respectively. However, most of the traditional processes have problems such as long hot-pressing time, large slab compression ratio, and slab explosive plates. It not only affects the production efficiency, but also increases the production cost, which is not conducive to the long-term development of plywood enterprises. At present, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B27D1/04B32B7/12B32B37/12B32B37/06B32B37/10C09J197/00C09J199/00C09J161/24C09J161/06
CPCB27D1/04B32B7/12B32B37/06B32B37/10B32B37/12C09J161/06C09J161/24C09J197/005C08L99/00
Inventor 袁同琦陈月英孙润仓周贤鹏刘西姜志华赵保成
Owner BEIJING FORESTRY UNIVERSITY
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