Plastic bottle manufacturing process involves injecting a PET preform with varying wall thickness, orienting the preform and locating in a non-symmetric blow mold for bottle blowing

摘要

A preform(1) is injection molded in modified or unmodified polyethyleneterephthalate(PET) with a varying wall thickness along the length(4). After reconditioning the preform is oriented to a particular direction, located in a non-symmetric blow mold and a bottle is molded whose neck forms the bottle opening. The principal axis of the bottle body is at an angle( alpha ) to an axis of the bottle neck. Independent claims are made for: a) a preform(1) for bottle manufacture which has a varying wall thickness along the length; b) a use of a two part injection mold for preform manufacture which is divided along the preform length(4); c) a blow mold for producing bottles which has a tool section for holding the bottle neck area of a preform and defining the main axis of the mold and has an inclined bottle forming cavity whose opposing wall sections in a first plane through the main mold axis are at equal distances from the main axis and opposing wall sections in a second plane at a right angle to the first plane are at different distances from the main axis; d) a PET bottle produced by the process using the claimed preform.