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.可能出現(xiàn)問題的原因，(1).注塑速度不足。(2).塑料缺料(3).螺桿在行程結(jié)束處沒留下螺桿墊料。(4).運行時間變化。(5).射料缸溫度太低。(6).注塑壓力不足。(7).射嘴部分被封。(8).射嘴或射料缸外的加熱器不能運作。(9).注塑時間太短。(10).塑料貼在料斗喉壁上。(11).注塑機容量太小（即注射重量或塑化能力）。(12).模溫太低。 (13).沒有清理干凈模具的防銹油。(14).止退環(huán)損壞，熔料有倒流現(xiàn)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.解決方法：(1).增加注塑速度。(2).檢查料斗內(nèi)的塑料量。(3).檢查是否正確設(shè)定了注射行程，需要的話進行更改。(4).檢查止逆閥是否磨損或出現(xiàn)裂縫。(5).檢查運作是否穩(wěn)定。(6).增加熔膠溫度。(7).增加背壓。(8).增加注塑速度。(9).檢查射嘴孔有沒有異物或未塑化塑料。(10).檢查所有的加熱器外層用安培表檢驗?zāi)芰枯敵鍪欠裾_。(11).增加螺桿向前時間。(12).增料斗喉區(qū)的冷卻量，或降低射料缸后區(qū)溫度。(13).用較大的注塑機。(14).適當(dāng)升高模溫。(15).清理干凈模具內(nèi)的防銹劑。(16).檢查或更換止退環(huán)。

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.

注塑件尺寸差異：1.注塑件缺陷的特征：注塑過程中重量尺寸的變化超過了模具、注塑機、塑料組合的生產(chǎn)能力。2.可能出現(xiàn)問題的原因：(1).輸入射料缸內(nèi)的塑料不均。(2).射料缸溫度或波動的范圍太大。(3).注塑機容量太小。(4).注塑壓力不穩(wěn)定。(5).螺桿復(fù)位不穩(wěn)定。(6).運作時間的變化、溶液黏度不一致。(7).注射速度（流量控制）不穩(wěn)定。(8).使用了不適合模具的塑料品種。(9).考慮模溫、注射壓力、速度、時間和保壓等對產(chǎn)品的影響。

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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