Plastic Plate Deformation Using Controlled Temperature and Mould Catalyst
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Solution Overview
Problem
Existing methods for deforming plastic plates under elevated pressure and temperature conditions require multiple steps, including a post-curing process that uses chemicals, leading to increased costs and chemical loss, and result in undesirable springback and material defects.
Innovation Solution
The method involves heating the plastic plate to a temperature range of (Tg+15° C.) to (Tg+115° C.) before deformation, ensuring a glass transition temperature (Tg) of at least 70° C. to prevent springback, using a resin with suitable reactivity and pH-value, and applying differential pressure in a mould to achieve stable deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the plastic plate is deformed using the known method with asymmetric heating and immersion bath post-curing, then the plate can be deformed, but the process requires three separate operations and uses chemicals that increase costs and cause chemical loss
Solution Approach 1:
The patent combines the post-curing step with the deformation step by incorporating a catalytic amount of carboxylic acid directly into the mould. This allows the deformation and post-curing to occur simultaneously in a single operation, eliminating the need for separate immersion bath treatment and reducing process complexity
2Shape
If the plastic plate is deformed using the known method with incomplete resin curing, then the plate can be deformed, but springback occurs and mechanical properties are reduced
Solution Approach 1:
The patent changes the chemical parameter of the resin by adding a catalytic amount of carboxylic acid during deformation. This accelerates the curing reaction of the melamine-formaldehyde resin, ensuring complete curing during the deformation process itself, which prevents springback and improves the reliability of the deformed shape
3Reliability
If the plastic plate is deformed using the known method with immersion bath post-curing, then internal stress is reduced, but chemicals are lost and costs increase
Solution Approach 1:
The patent extracts the carboxylic acid catalyst from the immersion bath environment and incorporates it directly into the mould structure. This eliminates the need for chemical immersion baths while still achieving complete resin curing and internal stress reduction, thereby preventing chemical loss and reducing costs
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 approach simplifies the deformation process, reduces springback, and enhances mechanical properties by maintaining the intended shape and reducing material defects, while adhering to the NEN-EN438 norm.
Implementation Method 1
the plastic plate must have a temperature in the range of (Tg+15° C.)-(Tg+115° C.) prior to being deformed in the mould, wherein Tg (° C.) is the deformation or glass transition temperature of the plastic plate
Implementation Method 2
a deformation method characterised in that the plastic plate must have a temperature in the range of (Tg+15° C.)-(Tg+115° C.) prior to being deformed in the mould
Data Source
AI summary
The present invention relates to a method for deforming a plastic plate comprising a core of resin-treated fibers, wherein the plate is obtained by-compression under elevated pressure and temperature conditions and the plate thus obtained is deformed in a mold (1, 2, 3), characterized in that the plastic plate must have a temperature in the range of (Tg+15″C)-(Tg+115″C) prior to being deformed in the mold, wherein Tg (″C) is the deformation or glass transition temperature of the plastic plate.