(1) Uneven cooling.
The cooling water pipe of the mold should be increased, and check whether the cooling water pipe is blocked.
(2) Uneven wall thickness distribution.
The pre-tensioning and pressure-assisting devices should be improved, and pressure-assisting plungers should be used. The sheet used for forming should be uniform in thickness and heated evenly. Where possible, the structural design of the product should be appropriately modified, and reinforcing ribs should be set on the large plane.
(3) The mold temperature is too low.
The mold temperature should be appropriately increased to slightly lower than the curing temperature of the sheet, but the mold temperature should not be too high, otherwise
The shrinkage rate is too large.
(4) Demoulding is too early.
The cooling time should be appropriately increased. Air cooling can be used to speed up the cooling of the product, and the product must be cooled below the solidification temperature of the sheet to be demolded.
(5) The sheet temperature is too low.
The heating time should be appropriately extended, the heating temperature should be increased, and the evacuation speed should be accelerated.
(6) Poor mold design.
The design should be modified. For example, during vacuum forming, the number of vacuum holes should be appropriately increased, and the grooves on the trimming line of the mold should be increased.
