吸塑知识（Blister knowledge）.docVIP

吸塑知识（Blister knowledge） 1, the local plastic copper core, copper prices are too high. Look at the inner liner of the refrigerator vacuum forming mould design method. Understanding! The mold is a key determinant of refrigerator liner vacuum forming quality and yield. The structure of inner liner of refrigerator vacuum forming mould is different from other kinds of plastic mold, vacuum forming equipment is different, the mold structure is also very different. Because of the particularity of molding process, mold design such more features. Of course, as a kind of plastic mold, it also has some common plastic mold design, such as molding cavity design, core pulling mechanism design and cooling system design etc.. Design and other material mould in the design process is basically the same, according to the following general program design. 2.1, collect, analysis and digest raw data. Accept the mold design task, should do the following work: 1, analysis of the products: from the product shape, size precision, drawing ratio, radius, taper, reinforcement and material aspects of whether plastic structure to meet the requirements of vacuum forming process. Usually, because vacuum molding products easy to deformation, the geometrical shape and size precision is not too high, the theory on the tensile ratio of about 0.5 is appropriate, but the tensile container molding than is often greater than this value, this can take bubble pre stretch forming, otherwise the wall thickness is not uniform, easy to be broken. Special attention should be paid to some of the local convex part can not be too high, the corner there can be an acute angle, radius of not less than the plate thickness, draft door liner is generally 0.5 ~ 3 degrees, but the chamber deep some 620 (such as 340 liner, and the shelf) for the sake of good cooperation, the draft should be small, minimum up to 0.25 degrees, so it is necessary to use compressed air assisted demoulding; in order to improve the rigidity of prod