Hot pressing process for plywood

A hot pressing process and plywood technology, applied in the direction of manufacturing tools, wood processing appliances, wood veneer bonding, etc. The effect of improving, saving labor and reducing energy consumption of hot pressing

Inactive Publication Date: 2016-03-09
栾金榜 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most manufacturers who produce plywood will increase the number of hot-pressing shifts to cooperate with other processes, which not only increases labor input, but also causes high damage to hot-pressing equipment, high energy consumption, and it is easy to affect the performance of the board, resulting in large differences in the performance of the produced slabs.

Method used

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  • Hot pressing process for plywood
  • Hot pressing process for plywood

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Taking a 15mm eucalyptus slab as an example, adopt the process requirements of the present invention to carry out hot pressing treatment. The water content of the veneer forming the slab is 10%, and the phenolic resin adhesive used for the slab has a solid content of 50%.

[0023] In the first hot-pressing stage, turn on the hot-pressing machine to quickly increase the pressure to a plate surface pressure of 1.2Mpa and a temperature of 130°C. It takes 1 minute and 12 seconds to carry out the first stage of heat preservation and hot-pressing of the slab. The total hot-pressing time is based on the slab The thickness is set at 58s / mm, the total time is 15mm×58s / mm=870s, and the hot-pressing time of each hot-pressing stage is one-third of the total hot-pressing time, that is, 870s÷3=290s;

[0024] In the second hot-pressing stage, when the time of the first hot-pressing stage is over, the hot-pressing machine quickly lowers the pressure to 0.7MPa on the surface of the slab,...

Embodiment 2

[0034] Take a 12mm poplar slab as an example and adopt the process requirements of the present invention to carry out hot pressing treatment. The water content of the veneers forming the slab is 13%, and the urea-formaldehyde resin adhesive used in the slab has a solid content of 45%.

[0035] In the first hot-pressing stage, turn on the hot-pressing machine to quickly raise the pressure to 0.9Mpa on the surface of the slab, and raise the temperature to 100°C. It takes 1 minute to carry out the first stage of heat preservation and hot-pressing of the slab. The total hot-pressing time is based on the thickness of the slab. 55s / mm setting, the total time is 12mm×55s / mm=660s, and the hot-pressing time of each hot-pressing stage is one-third of the total hot-pressing time, that is, 660s÷3=220s;

[0036] In the second hot-pressing stage, when the time of the first hot-pressing stage is over, the hot-pressing machine quickly reduces the pressure until the surface pressure of the slab...

Embodiment 3

[0046] Taking the 18mm birch slab as an example, adopt the process requirement of the present invention to carry out hot pressing treatment, the water content of the veneer constituting the slab is 13%, and the urea-formaldehyde resin adhesive used in the slab has a solid content of 52%.

[0047]In the first hot-pressing stage, turn on the hot-pressing machine to quickly increase the pressure to a plate surface pressure of 1.3Mpa, and raise the temperature to 120°C. It takes 1 minute and 30 seconds to carry out the first stage of heat preservation and hot-pressing of the slab. The total hot-pressing time is pressed The thickness of the slab is set at 60s / mm, the total time is 18mm×60s / mm=1080s, and the hot-pressing time of each hot-pressing stage is one-third of the total hot-pressing time, that is, 1080s÷3=360s;

[0048] In the second hot-pressing stage, when the first hot-pressing stage is over, the hot-pressing machine quickly depressurizes to a pressure of 0.8MPa on the sur...

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Abstract

The invention discloses a hot pressing process for plywood. The hot pressing process for plywood includes a first hot pressing stage, a second hot pressing stage, a third hot pressing stage and a fourth non-polar pressure relief stage; hot pressing pressure of the three stages fluctuates, Brownian movement of the surface of a plate blank and internal plate layers is quickened, the hot pressing time of the plywood in each batch is greatly shortened by more than 10 min, and the bottleneck of the hot pressing working procedure in the plywood flow line production process is solved; and meanwhile, the plywood is better in performance and more stable.

Description

technical field [0001] The invention relates to the technical field of wood processing, in particular to a hot-pressing process for plywood, which is applied to the production of floor substrates. Background technique [0002] With the improvement of living standards, people are used to laying wooden floors with better foot feel indoors to look beautiful and elegant, and to make the living environment more comfortable. Plywood is made of three or more layers of veneer or thin board with a thickness of more than one millimeter and hot pressing. Plywood has the advantages of small deformation, large format, convenient construction, no warping, and good mechanical properties, so it is widely used as a floor substrate. The production of plywood mainly includes the following steps: material selection → rotary cutting → drying → cloth glue → billet formation → hot pressing → post-processing → finished plywood. The hot pressing process refers to: the slab with the adhesive applie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27D1/08
Inventor 栾金榜
Owner 栾金榜
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