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2014-10-30 19:40 Reply
How to choose plastic injection molding machine -1
 
Typically, the important factors when choosing plastic injection molding machine include mold, product, molding requirements and so on. Therefore, you must collect or have the following information before making a choice: mold dimension (width, height, thickness), weight and special design; types and amount of the plastic (single or multiple plastic materials); dimensions and weight of injection molding product (length, width, height, thickness); molding requirements, such as quality condition, production speed and so on. In obtaining the above information, you can follow these steps to choose a suitable plastic injection molding machine: Choose the right type of plastic injection molding machine: make decision by the products and plastic The plastic injection molding machine has a lot of types, so at the beginning, you should determine that what kind or which series of plastic injection molding machine is fit for the product. For example, for thermoplastic plastic or Bakelite resin or PET, the product is single color, two-color, multi-color, laminated or blending. In addition, some product requires high stability (closed loop), high precision, high injection speed, high injection pressure and rapid production (multi-loop) and so on. Able to put it on: the size of mold determine whether the internal spur of large column, the mold thickness, the minimum mold dimension and the mold plate size of plastic injection molding machine are suitable or not, to make sure that it is able to put mold on. The mold width and height must be less than or at least less than the internal spur of large column; The mold width and height must in the mold plate size range; the mold thickness should be between the thickness of plastic injection molding machine; The mold width and height must be fit with the minimum mold size recommended by the plastic injection molding machine. Able to put it out: the mold and product judge whether the “Opening Stroke” and “Ejector Stroke” are enough to remove the finished product. The opening stroke should at least larger than the product height along the opening direction more than twice, including the length of vertical sprue; ejector stroke should long enough to eject the finished product. Able to maintain locked: the product and plastic determine the tonnage of “clamping force”. When the raw materials inject into the mold cavity in a high pressure, it will create a bulging force, so the clamping unit of the plastic injection molding machine should provide sufficient “clamping force” so that the mold was not subject to distraction. The need of clamping force is calculated as follows: Clamping force = projected area of product in the direction of opening and closing mould (cm2) ×the number of mold cavity×in-mold pressure (kg/cm2); Projected area of product in the direction of opening and closing mould is generated by the product appearance size. In-mold pressure is different with different materials, generally take 350-400 kg/cm2. The machine clamping force is usually greater than 1.17 times of the bulging force.
 
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