Suction mold leakage, vacuum mold too cold, overheat, premature release, insufficient vacuum, too early to stop vacuum, uneven cooling direction, uneven heat, uneven distribution of suction wall thickness, uneven spacing, too plane rigid design is not good, sheet unidirectional stretching, and serious shrinkage of plastic sheet.
In summary, it is caused by problems such as mold, demoulding and vacuuming, so in the face of these problems, how should we solve them?
When the air leakage of the blister mold can strengthen the tightness around different molds or increase the vacuum degree, when the vacuum mold is too cold, the heat balance of the mold can be maintained, when the mold is overheated, the setting temperature and time can be controlled, when the vacuum is insufficient, the vacuum speed can be increased, when the vacuum is stopped too early, the vacuum can be delayed to close, and when the mold is removed too early, the setting temperature and time can be controlled. When the cooling direction is uneven, the cooling direction can be evenly controlled; when the heating is uneven, the temperature of the heater can be adjusted according to the specific situation of the sheet heat; when the distribution of the blister wall thickness is uneven, the molding effect and mold drawing design can be controlled; when the rigidity design of the large plane is not good, the large plane structure design can be improved; when the interval is uneven, the mold can be accurately positioned and removed. When the sheet is unidirectional drawing, the sheet processing technology can be improved or the sheet with uniform orientation can be selected, and the orientation direction can be avoided during typesetting. When the blister sheet shrinks seriously, the forming sheet and the formula design can be reasonably selected.
As long as you pay attention to the above problems, you can solve the problem of shrinkage and warping of blister packaging.
