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The Customization Of Silicone & Plastic Products
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The Customization of Silicone & Plastic Products
Part 1 Silicone Molding/Vacuum Casting Process
Step 1. Prepare the Master for Making the Silicone Mold
The master can be made from any stable material. Or it can be provided by the customer. In most cases, we make it via CNC machining or 3D printing.
Master materials are usually plastic or metal, which need to remain stable at 60-70℃ for a certain time.
Step 2. Make the Silicone Mold
The master is placed in a box and silicone is poured into it. It is then heated to 60-70℃in an oven until the silicone has completely cured.
After taking out the box from the oven, we cut the silicone into halves and remove the master. The silicone mold is ready with a shape as same as the master.
Step 3. Making the Parts via Silicone Mold
We can inject various compound materials into the mold according to your design requirements. To ensure that the replica is the same shape as the master, the mold is placed in a vacuum environment to remove air from the cavity and fill every area with liquid silicone.
After the material inside the silicone mold is cured and demolding, the part is ready.
Step 4. Doing the Surface Treatments
Sasanian offers a wide range of finishings to ensure that the part meets your expectations entirely. Our surface treatments include deburring, sandblasting, polishing, painting, drilling, tapping and threading holes, silk-screening, laser engraving, etc.
We also have a professional quality control team and equipment to inspect the parts to guarantee high quality.
Part 2 Plastic Injection Molding Production Process
Each plastic’s properties will make them appropriate for use in certain molds and components. The most common thermoplastics used in injection molding and their characteristics include:
Acrylonitrile-Butadiene-Styrene (ABS) – with a smooth, rigid and tough finish, ABS is great for components that require tensile strength and stability.
Nylons (PA) – available in a range of types, different nylons offer various properties. Typically, nylons have good temperature and chemical resistance and can absorb moisture.
Polycarbonate (PC) – a high-performance plastic, PC is lightweight, has high impact strength and stability, alongside some good electrical properties.
Polypropylene (PP) – with good fatigue and heat resistance, PP is semi-rigid, translucent and tough.
Injection molding machines can be powered by either hydraulics or electricity. Increasingly, Essentra Components is replacing its hydraulic machines with electric-powered injection molding machines, showing significant cost and energy savings.
Once the molten plastic reaches the end of the barrel, the gate (which controls the injection of plastic) closes and the screw moves back. This draws through a set amount of plastic and builds up the pressure in the screw ready for injection. At the same time, the two parts of the mold tool close together and are held under high pressure, known as clamp pressure.
Once most of the plastic is injected into the mold, it is held under pressure for a set period. This is known as ‘holding time’ and can range from milliseconds to minutes depending on the type of thermoplastic and complexity of the part.
After the holding and cooling times have passed and the part is mostly formed, pins or plates eject the parts from the tool. These drop into a compartment or onto a conveyor belt at the bottom of the machine. In some cases, finishing processes such as polishing, dying or removing excess plastic (known as spurs) may be required, which can be completed by other machinery or operators. Once these processes are complete, the components will be ready to be packed up and distributed to manufacturers.
The Customization of Silicone & Plastic Products
One-Stop Sourcing Service
