Fireproof Wood Strand Board Manufacturing Process
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Solution Overview
Problem
Existing methods for producing fire retardant oriented strand boards (OSB) face challenges in large-scale production, including inefficient impregnation of flame retardant chemicals, surface seepage leading to adhesive failure, and toxicity concerns, which hinder their indoor use in public buildings.
Innovation Solution
A method involving immersing wood strands in a watery flame retardant solution, separating and stirring them to enhance impregnation, followed by controlled drying to prevent chemical seepage, using a composition with ammonium phosphate and pH regulation, and applying adhesives to form boards with improved fire retardancy and environmental safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If strands are immersed in flame retardant solution for extended periods to ensure thorough impregnation, then fire retardancy is improved, but production time and efficiency deteriorate
Solution Approach 1:
The impregnation process is divided into two distinct stages: initial rapid impregnation where strands absorb flame retardant solution quickly, followed by a separation stage where strands are distributed and allowed to drain excess solution. This segmentation enables thorough impregnation without requiring extended immersion times, maintaining both fire retardancy and production efficiency.
Solution Approach 2:
The method performs preliminary separation and drainage of strands before they enter the pressing and bonding stages. By removing excess solution in advance, the process prevents adhesive contamination while ensuring strands are adequately impregnated, thereby eliminating the need for extended immersion times and maintaining high production speed.
2Reliability
If strands are thoroughly impregnated with flame retardant solution, then fire proofing is improved, but adhesive bonding deteriorates due to chemical seepage
Solution Approach 1:
The process includes a preliminary drainage and separation stage before adhesive application, where strands are allowed to shed excess flame retardant solution. This beforehand cushioning prevents chemical seepage from contaminating the adhesive, ensuring strong bonding while maintaining thorough impregnation for fire proofing.
Solution Approach 2:
By performing the separation and excess solution removal as a preliminary action before adhesive coating, the process ensures that strands retain sufficient flame retardant for fire proofing while preventing adhesive contamination, thereby resolving the contradiction between fire proofing and bonding strength.
3Reliability
If toxic flame retardant agents are used to meet fire safety standards, then fire retardancy is improved, but environmental safety deteriorates
Solution Approach 1:
The invention changes the chemical parameters of the flame retardant solution by using non-toxic substances such as ammonium phosphate, ammonium sulfate, and boric acid instead of traditional toxic agents. This parameter change maintains fire retardancy effectiveness while eliminating toxicity, thereby improving environmental safety.
Solution Approach 2:
The process applies flame retardant treatment specifically to the strand surfaces and internal structures through controlled impregnation, ensuring fire protection is localized where needed while using non-toxic chemicals that do not pose environmental hazards, thus resolving the contradiction between fire safety and environmental safety.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method significantly reduces impregnation time, prevents chemical seepage, and ensures effective bonding, producing fireproof OSB suitable for indoor use without toxic emissions, meeting fire safety standards and environmental health criteria.
Implementation Method 1
When immersed in the watery solution of the flame retardant chemical composition, the strands thus absorb this watery solution until they are saturated
Implementation Method 2
In the step (d), the strands are at least in part dried, whereby the water is at least in part removed from said strands, but the fire retardant chemical composition remains within the strands
Data Source
Figure 1
Figure 2~3
AI summary
The invention pertains to a method of manufacturing a fire proof board from strands of wood, the method comprising the following steps in the given order: (a) providing strands of wood, (b) immersing the strands of wood in a watery solution of a flame retardant chemical composition, (c) separating the strands of wood from each other, (d) at least in part drying the strands of wood, (e) applying an adhesive to the strands of wood, and (f) forming a board of a predetermined shape from the strands.. The invention furthermore pertains to a board formed by a plurality of strands of wood that are compressed and bonded together with an adhesive, wherein the board further comprises a flame retardant chemical composition, said composition comprising a phosphate compound.