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Blow mold design and processing

ABIS Mold Technology Co.,Ltd Updated: Oct 22, 2018

                                Blow mold design and processing

   Factors that determine mold efficiency are: l) materials;2) cooling;3) blank opening design;4) exhaust.

   The material to make the mold must have high thermal conductivity and sufficient cutting edge strength.The current aluminum 70/75 is the advanced alloy used to make most molds.Because the metal has good machining performance, the die cavity is usually cut by machine.The copper alloy mold also has high heat transfer and good corrosion resistance.However, its high cost and high price, due to its ratio of three times aluminum, may be more serious wear on the forming machinery.It is easily repaired by welding or inlaying method by steel alloy mould.

   The thermal conductivity of cast aluminum mold is worse than that of cut aluminum mold.The cutting edge of the mold cavity usually needs copper alloy or stainless steel inlay, because the strength and hardness of cast aluminum can not meet the requirements of cutting edge.

   Kirk alloy (zinc) castings can be made on steel moulds.The mold cavity and the bottom plate are poured into a definite size.Since kirk alloy is not strong enough to cut off the plastic, the operating holes and shoulder area are inlaid with copper alloy or stainless steel.The base and neck are also inlaid with these two metals.Molds can also be made of cast copper alloy.It is easier to cast with a steel cavity because it is cast under pressure or gravity.These cavities have many fine parts made from steel moulds or ceramic moulds.

   Cooling is challenging and important in die design.Drilled cooling pipelines are installed where cooling is most needed.For better control of production, most moulds are designed with several independent cooling zones.The neck and bottom require the most heat to be expended, thus requiring the most effective cooling.

   Cutting mouth.The design depth of the blank section may be an important factor in the output and quality of the parts.The blanking area is the place where too much plastic goes into the parts when they are blown.The type and shape of the blank opening may determine the welding of a part.String 6

   For harder resins, steel or copper alloys are used as raw materials.Sometimes the blanking area is blown with air to accelerate the cooling of the plastic, remove excess material and prevent parts from being distorted.

   Exhaust.When parts are blow-molded, the mold must be vented in order for the gas to escape quickly.The most common and economical method of exhaust is surface exhaust.Deep sand blasting or texturing of the mold cavity also helps to vent.Another important reason to vent (for those parts where plastics have to be blown into tight Spaces) is to show the details.

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