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Wood modification to enhance fire retardancy

A fire-retardant, wood technology, used in wood treatment, wood heating, wood impregnation, etc., can solve the problems of not being able to achieve and meet durability, and achieve the effect of improving dimensional stability and increasing wood densification

Inactive Publication Date: 2017-09-26
WOOD MODIFICATION TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The heat and chemical treatments currently applied to most wood species do not achieve and meet the levels of durability (for fungal decay and insect attack, mainly termites) and fire resistance prescribed by current territorial (national) standards

Method used

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  • Wood modification to enhance fire retardancy
  • Wood modification to enhance fire retardancy
  • Wood modification to enhance fire retardancy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (a) The operating pressure ranges from 50 to 3000 kPa depending on the various processing methods used.

[0031] (b) Also depending on the various processing methods used, the operating vacuum ranges from -10 to -90 kPa. These processes also require initial vacuum, final vacuum, extended vacuum, etc.,

[0032] (c) Depending on the process used, the pressure and vacuum cycle time will be from 2 to 120 minutes.

[0033] Heating (fixing) process.

[0034] Once the treated flame retardant "working solution" has been impregnated into the wood (via the treatment method), the wood must then undergo a heat (fixation) process based on a time / temperature scheme. The time / temperature protocol is based on a time range of 18 to 36 hours and a temperature range (in / out) of 80 to 130°C. The time / temperature range parameters are very critical to optimize chemical fixation without compromising wood strength.

[0035] In order to evaluate and quantify the effectiveness of chemical fi...

specific Embodiment approach

[0037] Example 1

[0038] wood impregnation process

[0039] The preservative treatment of wood by the pressure method is the preferred commercial method because it achieves a higher efficiency in controlling the conditions and effectiveness in achieving a more uniform, deeper penetration and greater absorption of the working solution. The processing equipment has doors at one or both ends to receive untreated lumber (charge) which is then loaded into containers for the processing to take place. The facility has various auxiliary equipment such as working tanks, flood lines, controls, vacuum pumps and pressure pumps to provide various treatment options.

[0040] There are two types of treatment pressure methods; the first is the "empty cell process" where compressed air is applied to the wood prior to the application of the wood preservative "working solution". The wood preservative was added from the equalizing tank into the container where air was exchanged with the prese...

Embodiment 2

[0052] heat (fixing) treatment

[0053] Once the treated fire retardant wood has been treated it has a high moisture content (%mc) in the range of 60-100% which needs to be dried to bring the moisture below 18%mc for resale. During the drying process, various kiln schemes are used to control temperature (set point), air flow (fan) and relative humidity at predetermined times. The kiln scheme calls for an inlet temperature (wet bulb) in the temperature range of 70-100°C and an outlet temperature (dry bulb) in the temperature range of 100-130°C. Initial time-temperature 1-2 hours, continue 18-36 hours, then return to ambient temperature. Pre-steaming can also be used in the initial stages. Other heat sources such as steam, radio frequency and microwaves can also be used.

[0054] The heating (fixation) process and the conditions required to achieve this are critical as it achieves two important processes, firstly reducing the moisture content (%mc) and secondly providing ener...

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PUM

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Abstract

The co-formulation of a wood preservative ('treated') with an inorganic (alkali metal silicates) based flame retardant which undergoes chemical impregnation. Once the 'treated flame retardant" working solution has fully penetrated (sapwood) into the wood, it then undergoes a heat (fixation) process using various heating schedules to achieve chemical fixation. The treated flame retardant Modified Wood [tfrMW] products are then tested for their enhanced fire performance properties. When heated, wood undergoes thermal degradation and combustion producing gases, vapours, tars & chars. Using the 'cone calorimeter' test method, the [tfrMW] products showed a significant reduction in the following parameters: heat release rate (HRR), mass loss rate (MLR) & smoke generated (SEA) values compared to untreated radiata pine.

Description

technical field [0001] It is an object of the present invention to provide a wood modification treatment that enhances the durability and flame retardancy of treated and untreated wood products. The treatment relies on the impregnation of various wood preservatives, flame retardants (auxiliaries) and other additives, followed by a final wood modification heat treatment step to produce a range of treated flame retardant modified wood [tfrMW] products . Background technique [0002] The development in the field of wood modification has increased significantly owing to the demand and need to enhance the properties of both treated and untreated wood products. The thermal and chemical treatment methods currently applied to most wood species do not achieve and satisfy the levels of durability (for fungal decay and insect attack, mainly termites) and fire resistance prescribed by current territorial (national) standards. [0003] While conventional chemically treated wood involve...

Claims

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Application Information

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IPC IPC(8): B27K3/08B27K5/02B27K3/52B27K5/00
CPCB27K3/08B27K3/52B27K5/001B27K5/02B27K2240/30B27K2240/20B27K2240/70B27K3/0292B27K3/153B27K3/22B27K5/0085C08L97/02C09K21/02B27K3/02
Inventor 罗纳德·菲利普·莫恩
Owner WOOD MODIFICATION TECH LTD
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