摘要:
METHOD FOR EXTRUSION FORMING A PREFORM INTO A TUBULAR CLOSED END EXTRUSION WHICH IS TRIM-FREE. IN THE EXTRUSION PROCESS A LUG PUSHES A HEATED PREFORM THROUGH A RELATIVELY SMALL APERTURE IN THE MIDDLE OF A DIE PLATE, THE PLUG CAUSING THE PREFORM TO FLOW FROM THE OUTSIDE TOWARDS THE MIDDLE OF THE DIE PLATE TO FORM THE EXTRUSION THROUGH THE APERTURE. THE TRIM-FREE CLOSED END TUBULAR EXTRUSION CAN BE EMPLOYED AS A PARISON FOR A BLOW MOLDED CONTAINER HAVING A NARROW NECK.
摘要:
AN APPARATUS FOR FORMING A SHEET MATERIAL INTO A CONTAINER END COVER AND SIMULTANEOUSLY SEALINGLY ATTACHING THE END COVER ABOUT THE RIM OF THE CONTAINER. THE APPARATUS INCLUDES A CYLINDRICAL MEMBER HAVING A HEIGHT LESS THAN THE HEIGHT OF THE CONTAINER TO BE COVERED AND AN INTERNAL DIAMETER GREATER THAN THE CONTAINER DIAMETER, SUCH THAT WHEN THE CONTAINER TO BE COVERED IS LOCATED IN THE
APPARATUS, A GAP EXISTS BETWEEN THE CYLINDRICAL MEMBER AND THE CONTAINER, MEANS ARE ALSO PROVIDED FOR CREATING A VACUUM IN THIS GAP WHEREBY A FORMABLE PLASTIC SHEET MATERIAL OVERLYING THE CONTAINER RIM AND UPPER SURFACE OF THE CYLINDRICAL MEMBER IS DRAWN INTO THE GAP AND BROUGHT INTO ENGAGEMENT WITH THE CONTAINER SIDE SURFACE.