Compression molding is a product molding method according to the characteristics of each stage in the resin curing reaction. Compression moulding normally uses a hydraulic press in which a mold tooling is fixed on the top and bottom platens of the press. The compression tool consists of a top cavity and a bottom cavity designed to produce the part to be manufactured and heated to the desired molding temperature. Firstly, powdery, granular or fibrous plastic is put into the cavity of mold at the molding temperature, then the compression mold is closed and pressurized to form and cure it, then the product is ejected by ejector, repairing the flash. MDC controls the flash within an ideal range through CNC processing technology and the processing technology of mold steel to reduce the waste of materials as much as possible. In addition, it can also be used for thermoplastic and rubber materials.
Comparing the compression moulding with injection moulding, injection molding can produce high quality products with complex structures. However, the strength of products is not enough, while compression molding allows longer fiber materials with very good strength and toughness. Moulds for compression moulding are generally simpler than their injection mold counterparts. There is no sprue and runner system in a compression mold and the process itself is generally limited to simpler part geometries due to the lower flow capabilities of the starting thermosetting materials. However, provision must be made for heating the mold, usually accomplished by electric resistance heating, steam, or hot oil circulation. What are the advantages of compression molding?
1. Suitable for mass production, short cycle and high efficiency;
2. The loss of raw materials is small, and the mold wear is small. MDC uses high-quality steel to improve the mold life.
3. The product has high precision, good performance, bright and clean surface, and less flash. MDC controls flash within an ideal range through CNC machining process and die steel processing process, and hardly requires additional complicated processing.
4. Advanced composite materials are used to ensure better mechanical properties of the products.
Compression molding are one of MDC's largest products, including SMC moldings, BMC moldings, and the design, produce, manufacture of carbon fiber composite moldings. Compression molds can be classified as hand molds, used for trial runs; semiautomatic, in which the press follows a programmed cycle but the operator manually loads and unloads the press, and automatic, which operate under a fully automatic press cycle (including automatic loading and unloading). MDC thinks that for compression molding, material, shape, pressure, temperature, part thickness, cycle time must be considered. MDC has mastered and innovated the molding process, analyzed the characteristics of the materials and the requirements of the products, and considered the applied pressure, temperature, time and other factors to ensure the uniform flow of the materials in the cavity of mold and fill the gaps to obtain the perfect products.The following are some of MDC's experiences with compression moulding： 1: Maintain pressure during cooling to avoid uneven surface. 2: Smooth surface mould with fast cooling rate can prevent the product from sticking to the mould.. 3: ...
Compression Molding is widely used in industry, agriculture, transportation, electricity, chemical industry, construction, machinery and other fields. It is usually used to manufacture large flat or moderately curved parts. MDC has developed molds such as spoiler templates, fenders, bumpers, front panel moulds on trucks, engine covers, doors, bottom fenders, car ceilings, seat backs, electric boxes and bathroom door panel basin moulds, etc. After effective optimization, the compression moulding we produce has a longer mould life and higher precision of product.
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