Hot pressing process of silicone products

The hot pressing process of silicone products has become an indispensable material in many fields in modern industrial production due to its excellent temperature resistance, corrosion resistance, and good physical properties. As a key technology in the production of silicone products, the precise process control of hot pressing technology is crucial for product quality.

1. Introduction to Hot Pressing Forming Process

Hot pressing is a commonly used process in the production of silicone products, which mainly utilizes high temperature and pressure to transform solid silicone raw materials into the desired shape. The process flow is complex and requires precise control of parameters such as temperature, pressure, and time to ensure the quality and performance of the product.

2. Hot pressing process flow

Raw material preparation: Select suitable silicone raw materials, usually in the form of milky white blocks. According to product requirements, add vulcanizing agents (ripening agents) and other additives such as colorants, luminescent powders, fluorescent powders, etc.

Rubber mixing: Put the prepared raw materials and additives into the rubber mixing machine for mixing, usually for about 30 minutes. This step ensures the uniform mixing of raw materials and additives.

Cutting: Cut the blended silicone raw materials into the required size for subsequent hot pressing molding.

Awakening material: Place the cut silicone raw material on the awakening material rack and let it sit for a period of time, usually about 8 hours. This step helps bubbles in the raw materials escape, ensuring the compactness of the finished product.

Hot pressing molding:

Put the awakened silicone raw material into the mold of the hot press vulcanizing machine.

Heat the mold to the set temperature, usually between 130 °C and 160 °C.

Apply pressure to fill the mold cavity with silicone material.

Maintain a certain holding time to allow the silicone to fully cure and form.

Sulfurization: During hot pressing, the silicone raw material undergoes a vulcanization reaction to form a stable rubbery substance.

Inspection: The molded silicone products need to undergo strict quality inspection, including inspection of appearance, size, performance, and other aspects.

Edge removal: Take qualified products out of the mold and remove excess burrs and materials.

Post processing: Based on product requirements, perform subsequent processing such as surface spraying, printing, engraving, etc.

Final inspection: Conduct final inspection on all processed products to ensure that each product meets quality standards.

Packaging: Packaging qualified products and preparing them for shipment.

In summary, through in-depth analysis of the hot pressing process of silicone products, we not only appreciate the complexity and precision of this technology, but also recognize its important role in promoting industry progress. With the continuous development of technology and changes in market demand, the hot pressing molding process will continue to be optimized and upgraded, bringing broader application prospects to the silicone products industry.