3240 epoxy board can be used in electrical insulation, mechanical equipment, electronic structural components, and other applications. It possesses properties such as insulation, heat resistance, and mechanical strength. During the manufacturing process of 3240 boards, strict material selection and lamination curing processes ensure product performance. This article will introduce the manufacturing process of 3240 epoxy board from raw material selection to final inspection.
3240 epoxy board, officially named Epoxy Phenolic Laminated Fiberglass Board, conforms to the national standard GB/T 1303.1. “32” represents the material as epoxy resin, and “40” represents the reinforcing material as alkali-free fiberglass cloth. It is a rigid sheet material made by impregnating electronic-grade alkali-free fiberglass cloth with epoxy resin and then hot-pressing it.
The manufacture of 3240 epoxy boards requires strict selection of raw materials, primarily including the following two:
1. Epoxy Resin: High-quality epoxy resin is used, combined with specific curing agents such as phenolic resin. This combination gives the board high-temperature resistance, strong adhesion, and chemical stability.
2. Alkali-Free Fiberglass Cloth: E-grade fiberglass cloth is used. Its low alkali metal oxide content ensures the electrical insulation performance of the board and maintains stable performance in humid environments. Simultaneously, the fiberglass cloth provides support to the board, determining its mechanical strength.
Adhesive application is the first step in manufacturing and directly affects the uniformity of the board.
· A roll of alkali-free fiberglass cloth is passed through an impregnation tank containing prepared epoxy resin solution.
· Ensure the fiberglass cloth is fully impregnated and evenly coated. Consistent resin content is ensured by controlling the cloth’s travel speed, tension, and resin viscosity.
· The impregnated fiberglass cloth is then placed in an oven. Pre-curing is performed at a specified temperature to achieve a “semi-cured” (Stage B) state, forming a dry and non-sticky adhesive cloth.
· The large roll of adhesive cloth is cut to the corresponding specifications according to the finished product size requirements.
· Multiple layers of cut adhesive cloth are stacked together. The thickness of the finished product is determined by the number of stacked layers. This step requires a clean environment to prevent impurities from entering.
Hot pressing is the core step in the manufacturing process. During this process, the adhesive cloth undergoes a chemical reaction to form a strong board.
Place the stacked adhesive tape assembly between the stainless steel templates of the press.
The hot pressing process consists of three stages:
1. Preheating: Under the set pressure and temperature, the resin softens and flows, expelling internal air and volatiles.
2. Temperature and Pressure Holding: Increasing the temperature and pressure allows the epoxy resin to fully cross-link and cure. Temperature, pressure, and time are critical parameters and must be precisely controlled—too low a temperature or insufficient time will result in incomplete curing, and insufficient pressure will cause the board structure to become loose and delaminate.
3. Cooling and Demolding: After curing, the board is gradually cooled under pressure and then removed from the press.
• Remove burrs generated during the pressing process to ensure accurate board dimensions.
• Cut the large boards into different specifications according to customer requirements.
• Conduct comprehensive testing on the boards according to national standards (such as GB/T 1303.1) or customer requirements, including:
1. Visual inspection: Check for defects such as bubbles, delamination, and scratches.
2. Dimensional inspection: Measure the thickness, length, width, and other dimensional parameters of the boards.
3. Performance testing: Test key performance indicators such as electrical strength (breakdown voltage), mechanical strength (flexural strength), heat resistance, and water absorption.
Only boards that pass all inspection items can be shipped as qualified 3240 epoxy boards.
The manufacturing of 3240 epoxy boards involves material selection and multiple precision processes. Each step, from raw material screening, impregnation, lamination, and hot-pressing curing, directly affects product quality and performance. Understanding its manufacturing process helps to gain a more comprehensive understanding of this material. At the same time, it can also provide a basis for selection, so as to select 3240 epoxy boards that are of qualified quality and stable performance.
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