Rubber ring tooling, mould/die making for rubber parts, plastic mould

Rubber ring tooling, mould/die making for rubber parts, plastic mould

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 tooling, mould/die making for rubber parts, plastic mould


Rubber ring tooling, mould/die making for rubber parts, plastic mould

Thermosetting plastics use screw or plunger to heat polymer barrels (48-126 C) to reduce viscosity, and then inject into heated dies (149-232 C). Once the plastic fills the mould, it is kept under pressure. Chemical crosslinking occurs at this time, which hardens the polymer. Hard (i.e. cured) plastic parts can be ejected from the die while hot, and it can not be re-formed or re-melted. The forming equipment has a hydraulic driving clamping device with a closed die and an injection device capable of conveying material. Most thermosetting plastics are used in granular or flaky form and can be fed to a screw injection device by a gravity hopper. When processing polyester monolithic moulding plastics (BMC), it is like "bread dough". The main polymers processed by this process are phenolic plastics, polyester monolithic moulding plastics, melamine, epoxy resin, urea-formaldehyde plastics, vinyl ester polymer and diallyl phthalate (DAP).

Most thermosetting plastics contain a large number of fillers (up to 70%) to reduce costs or improve their low shrinkage, strength or special properties. Common fillers include glass fiber, mineral fiber, clay, wood fiber and carbon black. These fillers can be very abrasive and produce high viscosity, which must be overcome by processing equipment. Figure Thermoplastics and thermosetting plastics both reduce viscosity when heated. However, unlike thermoplastics, the viscosity of thermosetting plastics increases with time and temperature due to chemical crosslinking reaction. The combined result of these effects is that the viscosity changes in a U-shaped curve with time and temperature. It is the purpose of thermosetting injection moulding to complete the filling operation in the lowest viscous area, because the pressure required for the material to form the shape of the mould is the lowest. This also helps to minimize fiber damage in polymers.

Compared with thermoplastics, thermosetting plastics have the characteristics of good dimensional stability, good heat resistance and rigidity, so they are widely used in engineering. The technological properties of thermosetting plastics are obviously different from those of thermoplastics. The main performance indexes of thermosetting plastics are shrinkage, fluidity, moisture content, volatile content and curing speed.

The shrinkage rate of thermosetting plastics is the same as that of thermoplastic plastics. The shrinkage rate of thermosetting plastics is calculated by the same method as that of thermoplastic plastics. The main causes of contraction are as follows.

Heat shrinkage and heat shrinkage are shrinkage caused by thermal expansion and cold contraction, which results in the cooling of plastic parts. As the main component of plastics is resin, the linear expansion coefficient is several to several dozen times larger than that of steel. When the plastic parts are cooled from the processing temperature to room temperature, the shrinkage will be much larger than the shrinkage of the die size. The shrinkage can be judged by the linear expansion coefficient of plastics. Thermal shrinkage is directly proportional to the temperature of the die, which is one of the main shrinkage factors in the forming shrinkage.



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Rubber ring tooling, mould/die making for rubber parts, plastic mould


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Business Phone :
86-7552-3156569(Working time)
Factory Address :
E bulding 220th Reixing industrial Park XingYe Road Wusha ChangAn GuangDong provice China

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