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A two station machine forms a parison from a plastic resin and then stretch blowing into a hollow-molded product. The machine has a preform station for forming a parison and a blow mold station for stretching and inflating the parison into the hollow molded object and then ejecting the hollow-molded

A two station machine forms a parison from a plastic resin and then stretch blowing into a hollow-molded product. The machine has a preform station for forming a parison and a blow mold station for stretching and inflating the parison into the hollow molded object and then ejecting the hollow-molded product from the machine. The preform station and the blow mold station are disposed at diametrically opposite locations on a circumference of a circle. A transfer portion has a transfer head rotatable about an axis extending through the center of the circle and having a pair of identical transfer stations located at diametrically opposite locations with respect to the axis. An indexer rotates the transfer head between two aligned positions in which one of the transfer stations is in registry with the preform station and the other transfer station is in registry with the blow mold station. Each transfer station has at least one parison engaging and retaining neck mold for engaging the parison formed at the preform station and retaining the parison for transfer from the preform station to the blow mold station upon rotation of the transfer portion from one to other of the two positions.

대표청구항 ▼

A machine for forming hollow molded products by injection stretch blow molding, comprising: a preform station for forming a parison; a blow mold station for stretching and inflating the parison into the hollow molded product and then ejecting the hollow-molded product from the machine; the preform s

A machine for forming hollow molded products by injection stretch blow molding, comprising: a preform station for forming a parison; a blow mold station for stretching and inflating the parison into the hollow molded product and then ejecting the hollow-molded product from the machine; the preform station and the blow mold station being positioned at diametrically opposite locations on a circumference of a circle; a transfer portion having a transfer head rotatable about an axis extending through the center of the circle and having a pair of identical transfer stations located at diametrically opposite locations with respect to the axis; indexing means for rotating the transfer head between two aligned positions in which one of the transfer stations is in registry with the preform station and the other transfer station is in registry with the blow mold station; each transfer station having at least one parison engaging and retaining means for engaging the parison formed at the preform station and retaining the parison for transfer from the preform station to the blow mold station upon rotation of the transfer portion from one to another of the two positions; adjustment means for moving the transfer head between a raised transfer position for rotating the transfer head between the aligned positions and a lowered operating position for forming the parison and the hollow-molded product; the preform station having a preform mold below the transfer head having an injection opening aligned with each of the parison engaging and retaining means of the aligned station of the transfer head and the preform station having a preform moving platen movable between a raised position and a lowered position and having a preform core pin depending downward and extending through the transfer head and into each of the injection openings when the transfer head and the preform moving platen are in the lowered position for forming the parison retained by the parison engaging and retaining means; and the blow mold station having a stretch blow mold below the transfer head having a mold cavity aligned with each of the parison engaging and retaining means of the aligned station of the transfer head for receiving the parison and forming the hollow-molded product, and the blow mold station having a blow mold moving platen movable between a raised position and a lowered position and having a blow core pin depending downward to extend through the transfer head and to seal the parison in the parison engaging and retaining means and each blow core pin having a stretch rod extending through a bore, the stretch rods movably mounted to the blow mold moving platen for movement between a retracted position, an extended position for stretching the parison and an ejection position for ejecting the hollow-molded product, wherein the stretch rod stretches the parison in the mold cavity and the blow core pin blows the parison into the hollow-molded product and then the hollow-molded product is ejected from the machine.