The Advantages of Polyurethane Isostatic Molds for Isostatic Technology
The Advantages of Polyurethane Isostatic Molds for Isostatic Technology
Isostatic pressing is inseparable from forming molds. Forming molds include steel molds and elastomer molds. Among them, polyurethane molds specially developed for isostatic pressing applications are the best to meet the needs of isostatic pressing. CIP rubber sleeves for cold isostatic pressing molding, DIP molds for dry bag isostatic pressing molds, and isolation sealing rubber sleeves for dry bag equipment.
Commonly used isostatic pressing molds include polyurethane isostatic pressing molds and rubber isostatic pressing molds. In traditional isostatic pressing equipment, rubber is widely used because it was used in isostatic pressing molds earlier. However, in recent years, polyurethane has gradually become well-known. Because of its excellent elasticity, it is replacing rubber products in various industries at an alarming rate, including isostatic rubber molds in isostatic pressing equipment. What are the advantages of polyurethane isostatic pressing molds compared with rubber isostatic pressing molds? Mainly reflected in the following aspects:
1. Wider application range. Polyurethane materials have a wide range of hardness and can be made into isostatic pressing molds with different hardness according to different equipment or pressing processes. For example, when pressing large-size workpieces, use polyurethane materials with greater hardness to make rigid molds, which have good support when loading and the mold will not deform; when pressing some special-shaped parts, use soft polyurethane molds with low hardness , easy to demould after pressing and easy to use. These characteristics cannot be satisfied by isostatic rubber molds.
2. The precision of polyurethane isostatic pressing mold is higher. Polyurethane molds are made by casting, with higher precision and more uniform material. The advantages are more obvious when pressing high-precision products.
3. Small deformation and high yield. The polyurethane isostatic pressing mold is cast from liquid polyurethane prepolymer. The material is more uniform, and the pressure is transmitted more evenly during the pressing process without bending or distortion.
4. Longer service life. Polyurethane has better pressure resistance than rubber, rebounds quickly after pressure, has small deformation, and does not reduce accuracy after long-term use. Moreover, the surface of the isostatic rubber mold is prone to oxidation and stickiness after being used for a long time. The polyurethane material has anti-oxidation ability, and the mold performance will not be reduced after long-term use or storage.
5. The surface of the polyurethane mold is smoother, and the surface of the pressed finished product is also very smooth. Post-processing is reduced, which improves efficiency and reduces costs.
6. Easy to demould. Polyurethane has good rebound, non-stick material, rapid demoulding after pressing, less post-processing and high efficiency.
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