Xiamen Better Silicone Rubber Co., Ltd
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Valve Compression Mould, also be known as Umbrella Valve Mold, One-way Check Valve Molding, Membrane Moulding, Duckbill Valve Mold and Mushroom Valve Moulding, mainly produce silicone valve that be used as sealing elements in backflow prevention devices. The valves include umbrella valve, duckbill valve, membrane and cross slit valve. They are often used to block the return of gas or liquid, creating a one-way access.
Valve Compression Mould's advantage is that compare to transfer mlding and injection molding, it is one of the lowest cost molding methods; In addition, it wastes relatively little material, which gives it an advantage when dealing with expensive compounds.
Valve Compression Mould's Structures
Compression Mold Valve Materials
EPDM Valve | Hardness:30~90 Shore A |
| Service temperature: -45℃~100℃ | |
| Advantaged: Excellent heat resistance, weather resistance and ozone resistance. Good water resistance, electrical insulation, low temperature. | |
| Disadvantages: Poor air tightness, self-viscosity and mutual viscosity, not resistant to non-polar solutions. |
Neoprene Valve | Hardness: 40~95 Shore A |
| Service temperature:-45℃~135℃ | |
| Advantages: Great resistance to exposure to the ozone, sunlight, oxidation, weather, oils, solvents, and several other materials. It is also tear resistant, is durable, and easily adheres to metals and fabrics. | |
| Disadvantages: Poor resistance to strong oxidising acids, esters, ketone and certain hydrocarbons. |
FVMQ Valve | Hardness: 45~80 Shore A |
| Service temperature: -60℃~180℃ | |
| Advantages: Heat resistance, cold resistance, high voltage resistance, weather resistance, oil resistance, acid and alkali resistance, hydrocarbon solvent resistance. | |
| Disadvantages: Poor wear and abrasion resistance. Not recommended for dynamic sealing. |
NBR Valve | Hardness: 50~90 Shore A |
Normal service temperature:-35℃~100℃ Low temperature resistance type: -55℃~100℃ High temperature resistance type: -30℃~125℃( in the air); -30℃~150℃( in the oil) | |
| Advantages: Excellent resistance to oil and non-polar solvents, excellent bonding properties, good mechanical properties and air tightness. | |
| Disadvantages: Weather resistance and ozone resistance is not strong. |
Compression Mould Surface Treatment
Sand blasting adopts compressed air as the power to form a high-speed jet beam to spray the material (copper ore, quartz sand, emery, iron sand) to the surface of the mold to be treated at high speed, remove the residual burrs and rust, and make the surface of the mold smoother. The surface requirements of the different products are different, and sand of different thickness is used. At the same time, the mechanical properties of the workpiece surface are improved, the fatigue resistance of the workpiece is improved, the adhesion between it and the coating is increased, the durability of the coating is extended, and the flow and decoration of the coating are also beneficial.
The sand blasting method is simple, so the cost is low. However, if the mold surface is sandblasted twice or multiple times, the tool edge of the mold will be damaged, resulting in more rough edges and thicker parting lines.
In the process of using chemical liquid to corrode the mesh, the liquid soaks the mold for a fixed time chemical reaction, which is not affected by the surrounding environment.
However, when the liquid corrodes the mesh, it needs to cover the non-texture area, which is difficult to operate. Moreover, the mesh life in the corrosion area of the liquid is relatively short, which can easily lead to the rapid scrapping of the mold core.
For the small mesh area that needs to be treated, there will be a dividing line between the mesh in different areas, so that the surface pattern of the products is inconsistent. In this case, chemical corrosion is suitable for products that need to form a large area of mesh.
EDM treatment is easy to operate, short time, high precision, suitable for small area of mesh processing. And the electrical spark hit out of the mesh is harder. Usually 5 Axis Machine is used for processing, so the cost of EDM is the highest.
