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What are the reasons for the shortage of medicinal plastic bottle caps?

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What are the reasons for the shortage of medicinal plastic bottle caps?

2019-07-23
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The lack of material in the medicinal plastic bottle cap refers to a partial incomplete phenomenon at the end of the stream or a part of the multi-cavity is not completely filled, generally occurring in a place away from or thin section. Below we Hubei pharmaceutical plastic bottle manufacturers to give you a detailed introduction to the lack of materials:


1, process factors

(1) The filling pressure and speed are too slow. During the injection molding process, the pressure of the cavity is insufficient due to pressure loss, and it is difficult for the melt to fill the entire cavity.


(2) The injection time is too short, the melt has not filled the cavity, and the injection process has ended. The injection time can be extended or the injection speed can be increased.


(3) The mold temperature is too low, the flow resistance of the melt increases, the flow rate is slowed down, and even in the middle of the flow path, gate or filling, the feed is prevented from continuing to feed, and the cavity is not easily filled. The temperature of the chiller can be increased to increase the mold temperature.



(4) The temperature of the material tube or the temperature of the hot runner is too low, which affects the fluidity of the melt, which may easily lead to insufficient filling, and may increase the temperature or increase the injection pressure.


2, equipment factors

(1) The nozzle is clogged, affecting the discharge, the nozzle should be cleaned, and clean raw materials should be used.


(2) The inside of the injection rubber cylinder is leaked, the injection rubber cylinder is inspected and the oil seal is replaced.


(3) The nozzle leaks, the machine center and mold center point should be adjusted or the nozzle should be replaced.


3, the mold factor

(1) The mold is poorly exhausted, the air in the cavity cannot be discharged in time, resulting in insufficient filling, and the filling speed can be appropriately reduced, or the mold clamping force can be reduced or the vent hole can be increased.


(2) The mold design is unreasonable, repair the mold into the glue gate position, increase the glue gate or mold to reduce meat.


(3) The insert is loose and the insert screws are locked.


(4) The hot runner is unbalanced or the hot runner is blocked, causing the melt to flow unsmoothly, adjusting the hot runner temperature corresponding to the high-deficient product and adjusting the runner or gel, and using clean raw materials.


(5) The ejector pin is not retracted, and the effective filling space is reduced. The ejector pin hole and the ejector pin should be polished.


(6) The drum is not returned and should be polished or replaced.

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