Why is your plastic sleeves box brittle?

First, the mold level

(1) The water gate is too small.

(2) The splitter is too small or unreasonably equipped.

(3) The mold design of collapsible bulk containers is not very good, resulting in abnormal injection molding cycle time.

2. Machinery and equipment

(1) There are blind spots or obstacles in the head, which are very easy to promote the dissolution of the molten raw materials.

(2) The melting capacity of the mechanical equipment is too small, the raw materials of the plastic coating box in the cylinder are not fully melted, the melting capacity of the mechanical equipment is large, and the heating and cutting time of the plastic in the cylinder is too long, and the plastic is very easy to age, making the equipment more and more brittle.

(3) The bouncing equipment is skewed or unbalanced, and the cross-section is small or uneven.

3. Raw materials

(1) The raw materials of the Plastic Sleeve Pack Box are mixed with other residues or unreasonable or excessive organic solvents or other additives.

(2) Too much plastic remanufacturing frequency, high reconstituted raw material composition, or too long heating time in the cylinder will promote the brittle cracking of the parts.

(3) The quality of plastics is poor, such as high relative molecular mass distribution, rigid molecular structure chains and other components with asymmetrical structures, which account for too much or are mixed with other plastics, poor additives, dust, and other residual environmental pollution are also due to brittleness.

4. the processing technology level

(1) If The temperature of the barrel and nozzle is too low, increase it. If the raw material is very easy to dissolve, the temperature of the barrel and the nozzle should be raised.

(2) Reduce the working pressure and speed ratio of the screw pre-plastic back pressure type, make the material slightly loose, and reduce the dissolution of the plastic due to over-temperature cutting.

(3) If the mold temperature is too high, it will be difficult to eject the mold; if the mold temperature is too low, the plastic will be refrigerated too early, and the welding seam will be poorly bonded, which is very easy to crack, especially for high melting point plastics such as polycarbonate.

(4) The cavity core must have a moderate ejection inclination. When the core is difficult to eject, increase the cavity temperature and reduce the cooling time. When the cavity is difficult to remove, reduce the cavity temperature and increase the cooling time.

(5) Try to avoid the use of metal material inserts, such as brittle plastics with a large specific volume of heat and cold, such as polyethylene, and do not add inserts for injection molding.

5. product design plan level

(1) The Plastic Sleeve Pack Box contains bevels, vacancies, or positions with very large thickness differences that are very prone to pressure cracking.

(2) The design of the Plastic Sleeve Pack Box is too thin or has too many hollow carvings.