Compression molding polyurethane is a manufacturing process. In this process, we place polyurethane materials in a mold cavity. Then, we apply pressure and heat. This makes the polyurethane flow and take the shape of the mold, creating polyurethane products with various shapes and properties.
Our Compression Molding Services
Our compression molding services cover both polyurethane and silicone rubber. Polyurethane compression molding is great for producing parts with larger cross – sectional dimensions, thick walls, high surface finish needs, and loose dimensional tolerance requirements.
The cost of compression molding molds is lower than injection molding molds but higher than open casting molds. Thus, it’s very cost – efficient for small batch orders and doesn’t need secondary processing.
Compression Molding Process Details
1. The Process Steps
First, pour the liquid polyurethane into the preheated mold. Next, through the mold, apply certain pressure and temperature to compress the materials in the mold. This makes a chemical reaction occur and the materials cure in the mold, giving us products with the desired shape and size.
However, compared with other polyurethane molding processes, compression molding usually has a longer production time. The reaction of liquid polyurethane and its complete curing can extend the overall production time. Additionally, the compression molding process generates more waste, and this waste is non – recyclable, which may raise the total cost of each part.
2. When to Choose Polyurethane Compression Molding
If your parts have a large cross – sectional area, complex structure, low dimensional accuracy requirements, small quantity demand, and a long cycle time, then polyurethane compression molding is the right choice for your project. We offer professional compression molding services and customized production to meet your diverse project part needs.
3. Silicone Compression Moulding
Silicone compression molding involves putting unvulcanized LSR material into the cavity of each half of the mold. After that, assemble the mold, place it in a heated compression press, and vulcanize it through compression molding to make parts.
We’ve produced silicone wheels, parts, and compression molded parts for OEM customers. We can also provide silicone to metal bond. Silicone rubber rollers are used for hot stamp, heat transfer, and heat seal applications.
Case Examples of Compression Molded Polyurethane
1. Polyurethane Seal Gasket
Polyurethane seals can effectively prevent liquids or gases from leaking. They maintain the pressure, stability, and tightness of the medium in the system. These seals are used for sealing various machinery, pipes, valves, pumps, etc.
2. Polyurethane Bushing
Polyurethane bushes are widely used in machinery manufacturing and construction. They reduce friction and wear, provide good shock absorption, and enhance component stability and load – bearing capacity.
3. Silicone Rubber Roller
Silicone rubber rollers offer good flexibility, elasticity, and resistance to wear, aging, and chemical corrosion. This reduces item damage during transmission. They’re often used in printing, electronics, food processing, and other high – temperature – resistant working environments.
FAQs for Compression Molding Polyurethane
1. Advantages of Compression Molded Polyurethane:
Polyurethane compression molding is an ideal choice for parts with simple or flat contours and larger or heavier sizes. It doesn’t need secondary processing, and the mold cost is relatively low.
2. Customizable Sizes:
We can customize various complex shapes and sizes according to your drawing. Just provide detailed specifications.
3. Production Cycle:
The production cycle of compression molding is relatively long. It specifically depends on the product complexity and order quantity.
4. Cost Calculation:
The cost of compression molding mainly depends on the product size, shape, quantity, and the type and quality of materials used.
5. Sample Provision:
Before bulk production, we can provide samples for you to evaluate if the product meets your requirements.
6. Product Durability:
The durability of compression molded polyurethane products depends on the specific usage environment and working conditions. Generally, polyurethane has good durability.
