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The bar size automatic control system

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  • 20/06/2018

Pressing the size of the automatic system of God see:1 a head; 2-LVDT; 3 an air meter; 4-piston device; 5 a control device; 6-SCR control; 7 a motor;The dimensional change of the bar at the die is converted into the change of the control voltage of the SCR motor, so that the speed of the production line is adjusted.Heat treatment: In the cooling process of the bar, the internal and external contraction cooling is inconsistent. Therefore, the internal stress of the bar is generally large. This int…

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Plastic bar cooling and braking adjustment

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  • 19/06/2018

The temperature of the cooling sizing die: the temperature of the cooling sizing die is somewhat lower. Cooling at the cooling stencil is stronger, improving the apparent quality of the bar and increasing the traction speed. The interface between the molten part and the solidified part of the cross-section of the bar in the dies is conical. If the molten plastic can be continuously fed to the tip of the cone, there will be no voids after the rod is cured. Therefore, the pressure of the molten pla…

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Plastic bar extrusion temperature requirements

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  • 15/06/2018

Drying of raw materials: The trace amount of moisture in the raw materials will cause a large amount of honeycomb inside the barVoids, engineering plastics such as PA and PC that are prone to absorb water must be dried to a moisture content of 0.3%-O.1%the following. There are many methods of plastic drying, such as infrared drying, vacuum drying, circulating air dryingand many more. Which specific method to use depends on the properties of the raw materialsThe dried plastic should be used immedi…

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Plastic bar extrusion process features

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  • 13/06/2018

When extruding plastic rods, in addition to reasonably controlling the temperature of the cylinders, the proper control of the temperature of the head and the hot and cold mold sections and the speed of the feeding speed is the key to extruding high quality rods.(1) Characteristics of extrusion process of non-crystalline plastic rods with high viscosity and poor fluidity When extruding non-crystalline plastic rods such as PC and modified polyphenylene ether, the fluidity of the high-bulk plastics…

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Thermal insulation and braking device for extruded bar

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  • 12/06/2018

Insulation washers: Insulation washers, also known as insulating baffles, are placed between the head and the cooling sizing die.Mainly between the head and the cooling sizing die to form a clear cold and hot interface. Insulation gasketGood choice of fluoroplastics, such as PTFE. PTFE is resistant to high temperatures, has a low thermal conductivity, and is unpaid.Self-lubrication and elasticity do not affect the surface quality of bars; their disadvantages are low hardness and creep.Phenomenon,…

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Extrusion bar cooling setting die

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  • 11/06/2018

The cooling and setting mold of the bar is similar to the cooling and setting mold of the pipe; the difference lies in the following points.1 The cooling bar of the bar must be closely connected with the machine head, and a gasket must be added between them.2 Do not set the evacuated structure in the cooling plate of the bar. All the cooling water is used.3 The diameter of the bar cooling sizing die should be slightly larger than the bar diameter.4 The cooling mold of the bar should be shorter. A…

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