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Blister Forming
Blister Forming
According to the principle that the blister is formed by heating the PVC film (hard sheet) through the mold and using compressed air or vacuum to form the blister of the required shape and size, so when the formed blister has problems, it is necessary to start from the following aspects solve:
(1) Whether the PVC film (the hard sheet) is qualified product;
(2) Whether the temperature of heating device is too high or too low;
(3) Whether the surface of heating device is adhered to PVC;
(4) Whether the forming molds is qualified, whether the forming hole is smooth, and whether the air hole is unobstructed;
(5) Whether the cooling system of forming model works normally and effectively;
(6) Whether the vacuum degree and exhaust rate of the drum negative pressure forming can reach the normal value, and whether pipeline has abnormal loss;
(7) Whether the compressed air of the flat type positive pressure forming is clean and dry, whether the pressure and flow rate can reach normal values, and whether there is any abnormal loss in the pipeline;
(8) Whether the flat positive pressure forming molds clamps the PVC belt in parallel, and whether there is air leakage.
