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Analysis of the reasons for the lack of glue in the products produced by vertical rubber injection machines will have the following situations
Release time
Aug 06,2021
Analysis of the reasons for the lack of glue in the products produced by vertical rubber injection machines will have the following situations
The first case: the screw of the vertical rubber injection machine can reach the set glue melting stroke, but it cannot reach the set injection stroke (including the amount of residual glue). In other words, there is glue in the barrel, but it cannot enter the mold cavity. Possible causes:
1. The melt fluidity of the vertical rubber injection machine is not enough. Fluidization of the melt is not sufficient, the flow resistance is large, and the mold filling is difficult. This may also be caused by the following reasons: a) The raw material itself has poor fluidity; B) The temperature display is incorrect, the barrel processing temperature is set too low or the temperature does not reach the set value. A mold temperature is low. Although there is colloid flow in the barrel, it flows into the mold channel, cooling is too fast, and the flow in the mold cavity is not smooth, resulting in insufficient filling.
2. The injection molding process parameters of the vertical rubber injection machine are not set correctly. Under the low injection pressure of the vertical injection molding machine, the bottom filling resistance of the colloid cannot be overcome; the injection speed is low, and when the melt is filled with a long cooling time, the fluidity is reduced, resulting in a large filling resistance; the injection residence time is short before the product is filled Stop filling the primer, etc., will cause dissatisfaction with the plastic products.
3. The filling channel of the vertical rubber injection machine is blocked. If cold glue, impurities or other substances block the glue filling channel, the glue cannot be repaired and the product is not satisfied with the glue. At this time, it is necessary to check whether the nozzle, main flow channel, shunt channel and gate of the vertical rubber injection machine are unblocked. If there is any blockage, it needs to be cleaned up.
4. The pouring system of the vertical rubber injection machine mold is defective. The defects of the mold gating system are divided into the following aspects: a) the runner is too small, too thin or too long, which increases the fluid resistance; B) the runner and the gate are rough, with scars or sharp corners, and the surface is rough and poor, which affects the material flow. Improper cold feeding or non-installation, cold glue collection is not timely, resulting in blockage of the runner or gate; Improper gate location or quantity, glue resistance is greater than injection pressure, glue cannot be injected into the mold; (e) The mold of the vertical rubber injection machine has poor exhaust or the exhaust position is improperly set, and the mold is partially stuck and the product is filled.
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