The accuracy of the mold directly determines the dimensional accuracy of the vacuum formed product, and seriously affects its molding. So in the process of mold design, multiple factors need to be considered: mold structure design, mold materials, processing and manufacturing,
(1) Mold structure design
The size design of the cavity directly determines the size. The process of defining the cavity size is not only based on the size of the product itself, but also takes into account factors such as material shrinkage and processing errors. This will be explained in detail in the materials section below.
02 Sheet difference
(1) Blister sheet, main physical performance indicators:
① Tensile strength: The maximum stress that a stretched sheet can withstand during the stretching process; ② Tensile elongation at break: The maximum elongation that a stretched sheet can achieve during the stretching process:
③ Tensile yield strength: The ability of a stretched sheet to resist yielding during the stretching process, with higher strength making plastic deformation more difficult
④ Shrinkage rate: The percentage difference in size between stretched sheets cooled to room temperature after heating:
⑤ Transparency: The transparency of stretched sheets,
⑥ Wear resistance: The wear resistance of stretched sheets. (2) Raw material acceptance method
① Tensile strength, tensile machine testing, test speed 100mm/min, data for different material structures vary. Enterprises can appropriately increase performance requirements and test the stability of each batch. The higher the tensile strength, the better the tensile resistance of the sheet and the less likely it is to break,
② Fracture tensile rate, tensile strength, and testing are similar to tensile strength. Different materials have different performance data, and testing is conducted to verify the values of each batch and test the stability of each batch. The fracture elongation rate mainly tests the maximum elongation rate of the sheet during the process of stretching to fracture.
