Composite Laminate Mold Releasability via Release Agent
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Solution Overview
Problem
Existing methods for producing fiber-reinforced thermoplastic (FRTP) members struggle with achieving stable production of FRTP members with good surface appearance and mechanical properties, while also ensuring releasability from molds and adequate workability and coating adhesion.
Innovation Solution
A composite laminate comprising an A layer and a B layer, where the A layer contains reinforcing fibers with an average length of 1 μm to 300 μm, spherical particles, and a thermoplastic resin, and the B layer contains longer reinforcing fibers and a thermoplastic resin. This laminate is produced by disposing the A layer film on both sides of the B layer sheet and applying heat and pressure to integrate them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a release film is used to prevent sticking of the layered base material to the mold, then the releasability from the mold is improved, but the heat conduction from the mold to the layered base material is interfered with, resulting in insufficient melting or solidification of the thermoplastic resin and low mechano-physical properties
Solution Approach 1:
The patent introduces a release agent applied directly to the mold surface as an intermediary substance. This release agent forms a thin coating layer that prevents sticking while maintaining thermal contact, serving as a mediator between the mold and the layered base material to resolve the contradiction between releasability and heat conduction.
Solution Approach 2:
The patent changes the physical state and application method of the release mechanism by applying a release agent as a coating rather than using a thick release film. This parameter change in the release mechanism's structure allows for better thermal contact while still providing sufficient release functionality.
2Strength
If the temperature of the mold is excessively increased or decreased to ensure proper melting or solidification of the thermoplastic resin, then the mechano-physical properties are improved, but the mold repeats contraction and expansion and may be damaged
Solution Approach 1:
The release agent acts as a thermal intermediary that improves heat transfer efficiency between the mold and the thermoplastic resin. This allows the process to achieve proper melting and solidification at lower temperature extremes, reducing thermal stress on the mold and preventing damage from repeated contraction and expansion.
3Strength
If continuous fibers are used to achieve good mechano-physical properties and less variations, then the strength is improved, but the shapability for complicated three-dimensional shapes is worsened
Solution Approach 1:
The patent segments the continuous fibers into shorter fiber lengths (5mm to 50mm) while maintaining fiber reinforcement functionality. This segmentation allows the fiber-reinforced thermoplastic material to be more formable into complicated three-dimensional shapes while still providing good mechano-physical properties and consistency.
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
The composite laminate achieves excellent releasability from molds, surface smoothness, mechanical properties, workability, and coating adhesion, enabling stable production of high-quality FRTP members.
Implementation Method 1
the heat conduction from the mold to the layered base material is interfered with, so that the resultant FRTP member has low mechano-physical properties, including strength and rigidity. If the heat conduction from the mold to the layered base material is interfered with, melting or solidification by cooling of the thermoplastic resin becomes insufficient
Implementation Method 2
melting or solidification by cooling of the thermoplastic resin becomes insufficient
Implementation Method 3
melting or solidification by cooling of the thermoplastic resin becomes insufficient
Data Source
AI summary
Provided is a composite laminate having excellent releasability from a mold during a production process, excellent surface appearance (surface smoothness) and mechano-physical properties, and excellent workability and coating adhesion. A composite laminate 1 includes an A layer 2 and a B layer 3, wherein the A layer 2 is provided directly or indirectly on one or both sides of the B layer 3, the A layer 2 contains reinforcing fibers (a1) with an average fiber length of 1 μm to 300 μm, spherical particles (a11) with a volume mean particle diameter of 0.01 μm to 100 μm, and a thermoplastic resin (a2), and the B layer 3 contains reinforcing fibers (b1) with an average fiber length of 1 mm or more and a thermoplastic resin (b2).