One problem or another may be encountered in the process of mold injection molding. What are the most likely defects? The author tells you that the defects most likely to be encountered in the process of mold injection molding are as follows: 1 Defects in injection molded parts are characterized by incomplete injection molding process, because the mold cavity is not filled with plastic or the injection molding process lacks some details.

2.可能出现问题的原因，(1).注塑速度不足。(2).塑料缺料(3).螺杆在行程结束处没留下螺杆垫料。(4).运行时间变化。(5).射料缸温度太低。(6).注塑压力不足。(7).射嘴部分被封。(8).射嘴或射料缸外的加热器不能运作。(9).注塑时间太短。(10).塑料贴在料斗喉壁上。(11).注塑机容量太小（即注射重量或塑化能力）。(12).模温太低。 (13).没有清理干净模具的防锈油。(14).止退环损坏，熔料有倒流现象。

2. Possible causes of problems, (1) Insufficient injection speed. (2). Plastic material shortage (3) There is no screw pad left at the end of the stroke. (4). Running time changes. (5). The temperature of the injection cylinder is too low. (6). Insufficient injection pressure. (7). The nozzle is partially sealed. (8). The heater outside the nozzle or injection cylinder cannot operate. (9). Injection molding time is too short. (10). The plastic is pasted on the throat wall of the hopper. (11). The capacity of the injection molding machine is too small (i.e. injection weight or plasticizing capacity). (12). Mold temperature is too low. (13). There is no antirust oil to clean the mold. (14). The check ring is damaged and the molten material has backflow.

3.方法：(1).增加注塑速度。(2).检查料斗内的塑料量。(3).检查是否正确设定了注射行程，需要的话进行更改。(4).检查止逆阀是否磨损或出现裂缝。(5).检查运作是否稳定。(6).增加熔胶温度。(7).增加背压。(8).增加注塑速度。(9).检查射嘴孔有没有异物或未塑化塑料。(10).检查所有的加热器外层用安培表检验能量输出是否正确。(11).增加螺杆向前时间。(12).增料斗喉区的冷却量，或降低射料缸后区温度。(13).用较大的注塑机。(14).适当升高模温。(15).清理干净模具内的防锈剂。(16).检查或更换止退环。

3. Solutions: (1) Increase injection speed. (2). Check the amount of plastic in the hopper. (3). Check whether the injection stroke is set correctly and change it if necessary. (4). Check the check valve for wear or cracks. (5). Check whether the operation is stable. (6). Increase the melt temperature. (7). Increased back pressure. (8). Increase injection speed. (9). Check the nozzle hole for foreign matter or unplasticized plastic. (10). Check the outer layer of all heaters and check whether the energy output is correct with an ammeter. (11). Increase the screw forward time. (12). Increase the cooling capacity in the throat area of the hopper or reduce the temperature in the rear area of the injection cylinder. (13). Use a larger injection molding machine. (14). Properly raise the mold temperature. (15). Clean the rust inhibitor in the mold. (16). Check or replace the retaining ring.

注塑件尺寸差异：1.注塑件缺陷的特征：注塑过程中重量尺寸的变化超过了模具、注塑机、塑料组合的生产能力。2.可能出现问题的原因：(1).输入射料缸内的塑料不均。(2).射料缸温度或波动的范围太大。(3).注塑机容量太小。(4).注塑压力不稳定。(5).螺杆复位不稳定。(6).运作时间的变化、溶液黏度不一致。(7).注射速度（流量控制）不稳定。(8).使用了不适合模具的塑料品种。(9).考虑模温、注射压力、速度、时间和保压等对产品的影响。

Dimensional difference of injection molded parts: 1 Defect characteristics of injection molded parts: the change of weight and size in the injection molding process exceeds the production capacity of mold, injection molding machine and plastic combination. 2. Possible causes of problems: (1) The plastic in the input injection cylinder is uneven. (2). The temperature or fluctuation range of the injection cylinder is too large. (3). The capacity of the injection molding machine is too small. (4). The injection pressure is unstable. (5). Unstable screw reset. (6). The change of operation time and solution viscosity are inconsistent. (7). The injection speed (flow control) is unstable. (8). Plastic varieties that are not suitable for molds are used. (9). The effects of mold temperature, injection pressure, speed, time and pressure holding on the product are considered.

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