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Company Address: Shangye Industrial Zone, Jiangkou Street, Huangyan District, Taizhou City

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Common quality problems and causes of preform mold
Edit:Taizhou Huangyan Yige Machinery Co., Ltd.   UpDate:2019-05-06

1.1 Bottle mouth flash

Flange at the mouth of the bottle means that the thread at the mouth of the bottle may have a thin layer of protrusions at the mold closure. Generally, the mold is closed due to mold wear, which results in too much data for injection molding, showing flash phenomenon.

1.2 Poor clamping

Preform mold clamping failure includes preform clamping failure and blow molding clamping failure. The reason for its composition is similar to that of the bottle mouth flashing due to the mold wear.

1.3 Dark ring

There is residual information on the shoulder of the bottle, and a ring is set there. The reason for its composition is generally due to uneven heating and rotation, and uneven stretching data during blow molding.

1.4 with impurities

There are impurities, black spots, foreign objects, unablated particles and so on in the bottle. The reason is generally that there is a problem with data processing before injection. For example, if the mold is clean, there will be black spots on the bottle. Impure particles will cause the presence of foreign matter and incomplete ablation. The failure of the filter at the mouth of the central distributor will cause incompletely plasticized particles to enter the mold cavity, and then make the inside of the bottle. There are unablated particles.

1.5 color

The color problem is for colored bottles, such as green tea bottles. At this time, you need to pay attention to whether the color is normal. There is a certain range of color depth, which is mainly distinguished by eyes. Colors above or below the color range are abnormal colors. The abnormal color is generally the abnormal operation of the masterbatch machine, and it may be abnormal when the screw rotates and mixes.

1.6 bottom deviation

Bottom deviation means that the injection point does not coincide with the center of the blow molding, making the thickness around the bottle uneven. There are many reasons. The common reasons are as follows: The first reason may be that the injection mold itself is not good enough, which makes the thickness of the injection preform uneven. The second possibility is that during the heating process, the preform is heated unevenly, and the stretching time is also uneven. The third is that the stretching rod is inclined downward during the blow molding process.

1.7 fluorescence

Fluorescence generally appears along with the bottom bias, which means that the screen wall is too thin to look under the light, and some areas are white and shiny. This phenomenon becomes fluorescence. The reason for the fluorescence composition is similar to the bottom deviation. It often appears on the bottom and shoulders of the bottle, and sometimes the blowing pressure will form fluorescence.

1.8 bubbles

There are air bubbles in the bottle. The main reason is that the boring is not enough when it is boring, so that the plasticized data contains gas.

1.9 Other

The bottle sometimes becomes whitish, opaque, and the ring is lifted up. Generally, the composition of these defects is relatively comprehensive and uncommon. Briefly.

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