Guides, 2: blow molding

Lee, N. C. Blow Molding Design Guide. (1998) Hanser Gardner Publications, Cincinnati. 

Blow Molding Processing Guide, Zytel Nylon Resins, H06024, E. I. du Pont de Nemours Co., Wilmington, Del., Oct. 1988. 

Table 4-11. Guide to Processing Temperatures of Plastics for Blow Molding. ...

Table 4-14. Guide to Common Blow Molding Problems...

Unlike injection blow molds, which are mounted onto a die set, extrusion blow molds are fitted with hardened-steel guide pins and bushings to ensure that the two mold halves are perfectly matched. Dies, mandrels, blow-pin cutting sleeves, and neck-ring striker plates are made from tool steel hardened to 56-58 HRC. 

Blow Molding Polyethylene Processing Guide, Nova Chemicals, Alberta, Canada, 1999. 

A practical guide for designing a rectangular container is to allow a minimum corner or edge radius of at least one-third the depth of the blow mold half. For cylindrical containers, the radius should be at least one-tenth the diameter of the container. 

Lee, Norman C. Blow Molding Desiai Guide Carl Hanser Veagi. Munich 1998 pg. 154-156... 

In blow and blow operations, the gob of glass (parison) is deUvered from the feeder to the blank mold. The gob drops through a guide funnel iato the blank mold ia the iaverted position. Air is appHed to settie the gob iato the finish, and air is blown ia to complete the parison shape. 

The parison and bottle molds are mounted onto a die set, which is then mounted to the platens of the injection blow molder. Keyways in two directions, on the upper and lower platens, are used to precisely position the cavities. Guide-posts and bushings maintain precise alignment between the plates. To speed the operation, the entire die set or mold assembly is exchanged during a job change. It is considered false economy to reuse the die set with another mold set. 

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