Rubber ring mould, tooling/die making service, Kayou plastic mold

Rubber ring mould, tooling/die making service, Kayou plastic mold

Service Details:

  • Brand:Kayou
  • Serial Number: M-0178
  • Country of Origin:Shenzhen, China
  • Certificate:ISO9001

Payment & Shipping Terms:

  • Price Quote:Negotiable
  • Minimum Order: 1
  • Average Delivery Time:25 days
  • Payment Method:T/T
  • Package Details:Wooden Case
  • Ability to Supply:5 Set/per month
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Rubber ring mould, tooling/die making service, Kayou plastic mold

Description

Rubber ring mould, tooling/die making service, Kayou plastic mold

Shrinkage thermosetting plastics due to structural changes in the molding process due to cross-linking reaction, the molecular structure changed from linear structure to network structure, due to the reduction of molecular chain spacing, the structure became compact, resulting in volume changes. This contraction caused by structural changes will not continue to occur when it reaches a certain level.

After the elastic recovery plastic parts are removed from the mould, the pressure acting on the plastic parts disappears. Because the plastic parts are not rigid after solidification, the elastic recovery will occur during demoulding, which will cause the negative shrinkage (expansion) of the plastic parts volume. This is especially true when forming thermosetting plastics filled with fiberglass and cloth.

When the plastic parts are demoulded, the forming pressure decreases rapidly, but the wall of the mould is pressed tightly around the plastic parts, resulting in plastic deformation. The shrinkage of the deformed part is larger than that of the non-deformed part, so the plastic parts tend to shrink smaller in the parallel direction of pressure and larger in the vertical direction of pressure. In order to prevent the difference of shrinkage between the two directions from being too large, the method of rapid demoulding can be used to remedy it.

The factors affecting shrinkage of thermosetting plastics are the same as that of thermoplastics, including raw materials, die structure, forming methods and forming process conditions. The types and contents of resins and fillers in plastics will also directly affect the shrinkage rate. When the resin used in the curing reaction emits more low molecular volatiles, the shrinkage rate is higher; when the low molecular volatiles emitted are less, the shrinkage rate is smaller than that of plastics with more fillers or inorganic fillers with more fillers.

The shrinkage of plastic parts can be reduced by increasing the molding pressure, filling fluidity and compacting the mould structure. For example, the shrinkage of plastic parts by compression or injection moulding is smaller than that by injection moulding. The shrinkage of plastic parts can be reduced by all the process factors that can make the plastic parts compact and volatile matter escape before forming, such as preheating and pressurizing phenolic plastics before forming.

Thermoplastic reinforced plastics

Thermoplastic reinforced plastics are generally composed of resins and reinforcing materials. At present, the commonly used resins are nylon, polystyrene ABS, AS, polycarbonate, linear polyester, polyethylene, polypropylene, polyformaldehyde and so on. Reinforcement materials are generally alkali-free glass fibers (there are two kinds of length, long fibers and granular materials are generally the same length, 2-3 mm, short fibers are generally less than 0.8 mm) after surface treatment and resin preparation. The fiberglass content is generally between 20% and 40%. Due to the different resin used in various reinforcing plastics, the length, diameter, alkali content and surface treatment agent of glass fibers are different, and their reinforcing effects and forming characteristics are different. As mentioned above, reinforced materials can improve a series of mechanical properties, but there are also a series of shortcomings. For example, impact strength and impact fatigue strength decrease (but notch impact strength increases), transparency and weld strength also decrease, and the anisotropy of shrinkage, strength, thermal expansion coefficient and thermal conductivity increases. So at present, the plastic is mainly used for small, high strength, heat resistance, poor working environment and high precision plastic parts.

 

 

 

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Rubber ring mould, tooling/die making service, Kayou plastic mold

 

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FAX :
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