Production process of silicone products
1. Core molding process
Compression molding
Place the mixed silicone raw material in the mold and apply high temperature (160-180 ℃) and pressure (15-20MPa) through a vulcanizing machine to solidify and form, suitable for high-precision and complex shaped products (such as seals and buttons).
Advantages: Accurate size, smooth surface; Disadvantages: High mold cost and limited product structure.
Extrusion molding
Squeezing silicone raw materials through screws to form long strip or tubular products (such as silicone tubes and sealing strips) through specific cross-sectional molds.
Advantages: Continuous production, high efficiency; Disadvantage: The cross-sectional shape is limited by the mold.
Injection molding
Inject liquid silicone into the mold, cure at high temperature and form, suitable for precision electronic components and encapsulated products (such as phone cases and medical devices).
Features: High precision (± 0.05mm), capable of encapsulating materials that are not resistant to high temperatures (such as plastics).
Dropping process
Liquid silicone gel is dripped into the mold through a pneumatic syringe, and after vulcanization, it forms multi-color products (such as wristbands and phone cases).
Advantages: Supports multi-color design; Limitations: Low production capacity, relying on manual operations.
Liquid injection molding
Using A/B component liquid silicone mixed and injected into a 130 ℃ mold, suitable for coating materials that are not resistant to high temperatures (such as plastic parts).
Features: Low temperature molding, high degree of automation, but the raw material cost is 3-5 times that of solid silicone gel.
2、 Other types of processes
Rolling forming
The silicone raw material is pressed into sheets through a rolling machine for the production of flexible products such as silicone pads and sealing strips.
Vacuum forming
Silicone raw materials are attached to molds under vacuum adsorption, suitable for complex curved products (such as irregular seals).
Secondary sulfurization
Perform secondary high-temperature treatment (180-200 ℃) on the formed silicone products to remove odors and residual low molecular compounds, and improve food grade safety.
3、 Supporting process flow
Raw material mixing
When mixing silicone rubber with vulcanizing agents, colorants, and other auxiliary materials, it is necessary to control the number of rolling cycles (60-80 times) and time (about 20 minutes) to ensure uniformity.
Post processing
Including trimming of cape burrs (manual/mechanical/frozen deburring), cleaning, polishing, and full inspection (appearance, size, performance testing).
