Quickly Learn About The Common Quality Defects And Solutions in Bottle Blowing Packaging Materials

Blowing is one of the main processes in the molding of cosmetic packaging materials. Its molding methods are also diverse, including injection blowing, injection stretch blowing, extrusion blowing, etc. Commonly used blowing materials include HDPE, LLDPE, LDPE, PP, EVA, PETG , PETP, etc. Blow molding products are widely used in skin care and cleaning products. This article analyzes several common quality defects of bottle blowing craft products, for your reference.

Bottom molding is not full (concave feet)

Symptoms: The bottom contour of the petals is not ideal, especially the bottom corners are concave. Although the bottom is not fully formed, it has little effect on filling, but it affects the stability of the bottle.

Factor:

1. Caused by insufficient high pressure gas;

2. The temperature in the area where the bottom corner is located is not enough;

3. The high-pressure blowing time is too short (the pre-blowing time is too long);

4. The pre-blowing air is too late;

5. The exhaust hole of the bottom mold is blocked.

Solution:

1. Check whether the high-pressure air intake is above 28BAR;

2. Check whether the high pressure filter on the side of the mold is unblocked;

3. Check the working conditions of each valve to ensure accurate positioning of stretching during pre-blowing and high-pressure molding;

4. Check the pre-blowing and high-pressure blowing control components to ensure the correct set value and the interior is unblocked;

5. Ensure that the pre-blowing is not too late, and the time should not be too long. Otherwise, the high-pressure blowing time is too short, and the effective cooling time of the bottle in the mold is not enough;

6. Ensure that the exhaust holes in the bottom mold are unblocked;

7. Increase the heating percentage of the area where the bottom corner is located or increase the number of lamp tubes to increase the temperature of the area;

8. According to the actual situation of the bottle (bottle partition weight, thickness), reduce the temperature of the thinner area, so that the material at the bottom corner is distributed to these areas.