Today, Eternal Sheng Xiaobian will take everyone to see the causes of poor blister molding in the blister machine and the improvement methods.

whitish

Reason: 1. The stretching speed is too slow. Method: Speed up the pumping and stretching speed.

2. The length of the grill is inconsistent with the length of the mold. Methods: a properly adjust the length of the baking sheet APET,PS (natural color) is easy to turn white B. reduce the heating time of the two films c. use a hot air gun to heat the white part, which will cause whitening (not applicable to APET materials)

3. The temperature is too high method: reduce the temperature and shorten the heating time

Ghost

Reason: The mold temperature is too low Method: After the mold temperature is normal, it can be preheated first, generally the first batch of production or just production.

Control line

Reason: 1. The gap between the concave and convex positions of the mold is small and at right angles: A modifies the mold structure, changes the right angle to rounded corners, B adjusts the upper molding method, and the temperature of the electric oven grill at the angle C is too low or too high.

2. Improper position of vacuum hole: Modify the vacuum hole and add more vacuum holes to the last stretched part.

3. The method of heating the sheet too high: reduce the temperature or shorten the heating time to improve the cooling efficiency.

4. Improper adjustment of the upper die: use appropriate sheets or use a grid-like upper die to help press.

5. Improper coordination method of gate lowering: adjust the gate lowering time

6. The method of unreasonable upper die structure: remake the upper die or modify the orientation of the upper die

7. Vacuum time too fast or too slow method: appropriate adjustment of the time of both, both

Poor demoulding (deformation)

Reason: 1. Mold adjustment or poor processing method: mold design to improve processing accuracy (try to avoid right angles)

2. Vacuum eye quantity is not enough method: increase the amount of vacuum eye

3. High mold temperature method: reduce the mold temperature (extend the cooling time)

4. Demoulding strength is not enough or too high method: demoulding blowing or shock mold can be used

5. Sheet stretching method: modify the mold structure or thicken the sheet

Uneven thickness

Reason: 1. Sheet temperature uneven method: replacement of raw materials

2. Local over-stretching method: the use of shelf-assisted stretching to reduce local over-stretching

3. Mold arrangement too dense method: reduce the number of mold arrangement, re-layout

4. Sheet heating uneven method: improve the heating device, re-adjust the temperature of the electric furnace

5. Upper and lower die asymmetry method: adjust the upper and lower die pressure evenly

6. Vacuum suction too fast method: slow vacuum suction time

Deformation after forming

Reason: 1. Demoulding too slow method: speed up the demoulding time

2. Sheet uneven method: use uniform raw materials

3. Method of excessive demoulding blowing: reduce demoulding blowing

4. Vacuum time is too short method: extend the vacuum time

5. Improper matching method of upper die: adjust the angle of upper die

Pressure injury, scratch

Reason: 1. Uneven mold method: adjust to the mold level

2. The upper mold protector is too thick method: reduce the thickness of the protector

3. Demoulding and wiping method: proper use of release agent

4. Product stacking and wiping method: neat and regular stacking

Pit, grease, flower, concave, crystal point

Reason: 1. The sheet has foreign matter method: use a better sheet

2. The surface of the mold is not clean method: use water and sandpaper to polish

3. Cooling system has moisture method: heating cooling filter

4. Poor environmental sanitation method: organize the work site

5. There are bubbles in the sheet method: use a better sheet

6. Mold damage method: re-mold or mold repair