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Blowing Mould Has A Method Of Exhaust
Aug 14, 2017

  blowing mould has a method of exhaust

  Plastic blowing mould methods are five: extrusion blowing mould, injection blowing mould, stretch blowing mould, multi-layer blowing mould and foam blowing mould. The process of blowing mould products are generally: preparation and transportation of raw materials i production of i-shaped billet inflation, molding and cooling products, dressing and quality inspection Once you choose a good molding method, the molding process is basically determined. In addition, in the mass production of blowing moulded products, should also consider the operation of the molding process and should be equipped with auxiliary equipment.

  Operation methods are: manual operation, semi-automatic operation, fully automatic operation.

  The following issues should be considered when equipped with auxiliary equipment.

  (1) whether the raw materials are dry and the technical measures to be taken.

  (2) Corner waste disposal methods, reuse methods and technical requirements.

  (3) temperature control of the parison reheating device.

  (4) blowing mould or injection mold temperature control.

  (5) the use of compressed air drying and pressure.

  (6) blowing mould products after the cooling system.

  (7) blowing mould surface treatment, surface printing method.

  (8) blowing mould quality (size, pressure, anti-leakage, resistance to environmental stress cracking, etc.) check the way, methods and tools.

  What are the advantages and disadvantages of blowing mould compared to injection molding?

  Compared with injection molding, extrusion blowing mould has the following advantages:

  (1) blowing mould machinery (especially blowing mould) cost less (forming similar products, the cost of blowing mould machinery is about injection machinery 1 / 3-1 / 2), the production cost of the product is also low The

  (2) In the blowing mould, the parison is molded at a lower pressure by the nose and inflated at a low pressure (mostly 0.2 to 1.0 MN), so that the residual stress of the article is small, tensile, impact, and bending And the environment and other high performance of the strain, with good performance. In the injection molding, the melt in the high pressure (15-140yPa) through the mold flow and the gate, which will lead to uneven stress distribution.

  (3) The relative molecular mass of blowing mould grade plastics (eg PE) is much higher than that of injection grade plastics. Therefore, blowing moulded products have a high impact toughness and high resistance to environmental stress cracking performance, suitable for the production of packaging or transport of detergent and chemical reagents containers or vats.

  (4) Since the blowing mould is constituted only by the female mold, it is possible to change the wall thickness of the product by simply adjusting the gap or the extrusion condition of the nose die, which is advantageous for the inability to accurately calculate the desired wall thickness. While the injection molding i changes the wall thickness of the product is much higher.

  (5) blowing mould can produce products with small wall thickness, which can not be produced by injection molding.

  (6) blowing mould can produce complex, irregular and integral products. The use of injection molding, the first to produce two or more products, through the buckle with, solvent teaching or ultrasonic welding and other combinations together.

  However, the accuracy of blowing moulded products is generally not high in injection molding products.

  What is the design step for plastic blowing mould?

  Good blowing mould is from the beginning of the design. Plastic container blowing mould design is to create a competitive, high quality container key, is a systematic, integrated surname of the project planning. The first is to consider the use of functional; and then the material selection, to determine the blowing mould method (in particular, pay attention to the blowing mould of the type, stripping, exhaust, etc.); Finally, blowing mould die structure size and technical requirements to determine, At the same time also take into account the mold processing technology. The whole process should be closely integrated with production costs and efficiency.