Introduction to Plastic Molding Processing Technology
Low Pressure Molding, Hot Melt Molding, Waterproof and Dustproof, Encapsulation Molding
Small, thin, and lightweight! Challenging the production of a mobile antenna using a plastic molded composite integrated design!
This is an introduction to a case where "hot melt molding technology" was adopted to achieve the miniaturization of portable antennas for PCs equipped with digital TV tuners. To miniaturize the antenna, it was essential to fold the antenna in half. To achieve this, it was necessary to mold it as a single unit, including the hinge. What made this possible was a method using hot melt resin that can be molded at ultra-low pressure, which is still not widely used in Japan. By combining three types of molding technologies—gas assist, carbon dioxide, and hot melt—we successfully shaped a folded antenna through integrated molding without using a single screw. 【Benefits of Implementation】 ■ Reduction of subsequent processes through integrated molding ■ Good results in environmental testing (thermal shock testing machine) *For more details, please refer to the catalog or feel free to contact us.
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basic information
【Overview】 ■ Conducted carbon dioxide gas molding using a mold modified with additional gates to prevent underfilling. ■ Performed insert molding for carbon dioxide gas molding with an antenna substrate and hinge connected to the hollow case obtained from gas-assisted molding. ■ Successfully protected the exposed hinge with hot melt resin. ■ The hot melt molding material has excellent adhesion to various plastics, allowing for composite molding without any abnormalities such as peeling. *For more details, please refer to the catalog or feel free to contact us.
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Applications/Examples of results
For more details, please refer to the catalog or feel free to contact us.
Detailed information
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Example of waterproof sealing for agricultural machinery circuit boards. The left photo shows before sealing, and the right photo shows after sealing (the black part is the hot melt molded section).
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Example of encapsulation for industrial equipment circuit boards. The left photo shows before encapsulation, and the right photo shows after encapsulation (the black area is the hot melt molding section).
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Example of waterproof sealing for motor stators. The amber-colored areas around the circuit board and coils in the photo are hot melt molded sections.
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Company information
Our company provides comprehensive support for the introduction of hot melt molding methods, from initial technical discussions and appropriate hot melt selection to prototype production and evaluation, optimal process considerations for mass production, proposals for optimal equipment or the design and manufacturing of dedicated machines (automated systems), hot melt supply and line support. For customers for whom equipment installation poses a barrier to adopting this method, we even offer production contracting at our facility, ensuring support from "start to finish." **Benefits of Hot Melt Molding** - Improved production efficiency and cost reduction through alternative methods to potting - Greater design flexibility due to mold forming, enabling miniaturization and lightweighting of components - Use of sustainable raw materials derived from natural fatty acids We have various molding machines and displays of adopted products available at our prototype lab in Fuji City, Shizuoka Prefecture. Please feel free to visit, even just for a tour.
![Contributing to Sekisui's development products [heat dissipation, EMC, and weight reduction measures]!](https://image.mono.ipros.com/public/product/image/ae6/2001507285/IPROS11039745654635322290.jpg?w=280&h=280)