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A thermally modified wood product and a process for producing said product

A thermal modification, wood technology, used in wood treatment, wood impregnation, wood drying, etc.

Inactive Publication Date: 2019-01-15
STORA ENSO OYJ
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] There have been several attempts to reduce the negative impact of thermal modification on strength properties, although with little success

Method used

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  • A thermally modified wood product and a process for producing said product
  • A thermally modified wood product and a process for producing said product
  • A thermally modified wood product and a process for producing said product

Examples

Experimental program
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Effect test

Embodiment

[0042] heat treatment of materials

[0043] Sawn 45 x 145mm Norway spruce planks were heat treated according to the standard Thermowood D protocol and according to the specific protocol of the present invention. Both protocols used a 3-h plateau at a temperature of 212°C. A set of planks from the same batch was kept untreated to be used as reference material.

[0044] Standard Thermowood treatment

[0045] The standard Thermowood D scheme is designed as figure 1 shown. The 77h protocol included initial heating to 100°C, drying phase at elevated temperature up to 130°C, heating to plateau temperature, 3h treatment at 212°C, cooling, and conditioning.

[0046] The climate at the end of the HT-drying phase at 130° C. dry bulb and 99° C. wet bulb corresponds to an equilibrium moisture content (EMC) = 1% to 2,5%.

[0047] Specific treatment according to the invention

[0048] This particular treatment scheme is based on the idea of ​​reducing or eliminating the hydrolysis...

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PUM

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Abstract

The present invention relates to a process for preparing a modified wood product. More specifically, the invention relates to a method of performing thermal modification, wherein the thermally modified wood is suitable for load bearing use. The present invention also relates to a modified wood product produced using said process.

Description

technical field [0001] The present invention relates to a process for the preparation of modified wood products. More specifically, the present invention relates to a method of thermally modifying wood suitable for load-bearing applications. The invention also relates to modified wood products produced using said method. Background technique [0002] Many wood species are susceptible to damage caused by the external environment. Untreated wood that has been exposed to moisture and / or soil for a sustained period of time can become weakened by various types of microbial or insect attack. Therefore, it is important to treat less durable wood to increase its resistance to moisture and fungal attack. [0003] There are many different treatments that increase the resistance of wood to biological decay. Chemical treatments of wood to increase biological durability and strength have been used for a long time. Many different chemicals can be added. These chemicals are commonly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27K5/00B27K3/00
CPCB27K5/0085F26B5/04B27K3/00B27K5/00B27K5/009B27K3/0214F26B2210/16
Inventor B.凯兰德
Owner STORA ENSO OYJ