Method and apparatus of injection stretch blow molding
US5468443A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 12, 1993 |
| Grant date | Nov 21, 1995 |
| Priority date | — |
| Expiry date | Apr 12, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2949/0715
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An injection stretch blow molding method sequentially circulates a plurality of neck mold moving units for supporting and conveying neck molds adapted to hold the neck portions of hollow containers and preforms used to mold the hollow containers at least through preform injection molding, blow molding and ejecting stations, the preform injection molding step, the blow molding step for blow molding the hollow containers from the preforms having their potential heat provided by the injection molding step and the product ejecting step being repeatedly carried out. The injection molding stations of M in number are provided for blow molding stations of N in number (M>N.gtoreq.1). Preforms are injection molded in each of the injection molding stations at an injection molding start time staggered from those of the other injection molding stations by time equal to N.times.T/M where T is an injection molding cycle time in each of the injection molding stations. The neck mold moving units are sequentially moved from the injection molding stations to the empty blow molding station after the respective one of the injection molding stations has molded the preforms. The preforms are blow molded …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.