Plastic Mold for Motor bracket, injection molding production

Plastic Mold for Motor bracket, injection molding production

Service Details:

  • Brand:Kayou
  • Serial Number: M-0025
  • 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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Plastic Mold for Motor bracket, injection molding production

Description

Plastic Mold

Fluidity
The fluidity of thermoplastics can generally be analyzed from a series of indices such as molecular weight, melt index, Archimedes spiral flow length, apparent viscosity and flow ratio (flow length / plastic wall thickness). Low molecular weight, wide molecular weight distribution, poor molecular structure, high melt index, long snail flow length, low viscosity, and good flow ratio. For injection molding. According to the mold design requirements, the fluidity of common plastics can be roughly divided into three categories:
Good fluidity: PA, PE, PS, PP, CA, polymethyl decene;
Medium fluidity: polystyrene series resins (such as ABS, AS), PMA, POM, polyphenylene ether;
Poor fluidity: PC, hard PVC, polyphenylene ether, polysulfone, polyarylsulfone, fluoroplastic.
The fluidity of various plastics also varies with each molding factor. The main factors affecting are as follows:

Temperature
When the material temperature is high, the fluidity increases, but different plastics also have different, PS (especially high impact resistance and MHFR value), PP, PA, PMMA, modified polystyrene (such as ABS, AS), PC The fluidity of plastics such as CA and CA varies greatly with temperature. For PE and POM, the temperature increase and decrease has little effect on the fluidity. Therefore, the former should adjust the temperature to control the fluidity during molding.

Pressure
When the injection pressure is increased, the molten material is subjected to large shearing action and fluidity is also increased, especially PE and POM are sensitive. Therefore, it is necessary to adjust the injection pressure to control the fluidity during molding.

Mold structure
The form, size, arrangement, cooling system design, melt flow resistance (such as profile finish, channel section thickness, cavity shape, exhaust system) of the casting system directly affect the actual melt content in the cavity. Fluidity, where the melt is reduced in temperature and the fluidity resistance is increased, the fluidity is reduced. The mold should be designed according to the fluidity of the plastic used, and a reasonable structure should be selected. At the time of molding, the material temperature, the mold temperature, the injection pressure, the injection speed, and the like can be controlled to appropriately adjust the filling condition to meet the molding requirements.

Crystallinity
Thermoplastics can be divided into two types: crystalline plastics and amorphous (also known as amorphous) plastics.
The so-called crystallization phenomenon is that when the plastic is from the molten state to the condensation, the molecules move independently, completely in a disordered state, and the molecules stop moving freely, at a slightly fixed position, and have a tendency to make the molecules arranged into a regular model. a phenomenon.
As the standard for judging the appearance of these two types of plastics, it is possible to see the transparency of thick plastic parts of plastics. Generally, the crystalline material is opaque or translucent (such as POM), and the amorphous material is transparent (such as PMMA). However, there are exceptions. For example, polymethyl decene is a crystalline plastic with high transparency, and ABS is amorphous but not transparent.

In the mold design and selection of injection molding machines, attention should be paid to the following requirements and precautions for crystalline plastics.

When cooling back, the heat is released and it needs to be cooled sufficiently.
The specific gravity difference between the molten state and the solid state is large, the molding shrinkage is large, and shrinkage cavities and pores are likely to occur.
Fast cooling, low crystallinity, small shrinkage and high transparency. The crystallinity is related to the wall thickness of the plastic part, the wall thickness is slow to cool, the crystallinity is 髙, the shrinkage is large, and the physical properties are good. Therefore, the crystalline material should control the mold temperature as required.
The anisotropy is remarkable and the internal stress is large. Molecules that have not crystallized after demolding tend to continue to crystallize, are in an energy-unbalanced state, and are prone to deformation and warpage.
The crystallization temperature range is narrow, and it is easy to inject the unmelted material into the mold or block the feed port.

 

 

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Plastic Mold for Motor bracket, injection molding production

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Work Time :
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FAX :
86-7552-3156569
Business Phone :
86-7552-3156569(Working time)
Factory Address :
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