Extrusion die for extrusion blow molding equipment

Details Extrusion die for extrusion blow molding equipment Extrusion die for extrusion blow molding equipment

1991-06-17

1992-10-20

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

264 37, 2641761, 425132, 4251331, 425562, B29C 4718

Patent

active

051568578

ABSTRACT:
Disclosed are resin stream modulation or shut-off control apparatus for use in a multi-layer extrusion die head for forming a multi-layer plastic resin parison tube suitable for blow-molding. The tube can be formed into articles such as containers. By use of the apparatus, the tube, and accordingly articles therefrom can have layers which vary in thickness or can have portions wherein layers are omitted, e.g., portions which become flash. In an apparatus herein, there is a resin channel having an exit orifice defining a merge area where a first resin stream merges with at least one second resin stream. A die member adjacent to the exit orifice can define the resin channel. Movable means and the die element are caused to intermittently abut or contact one another at the merge area to control, i.e., modulate or shut-off, the flow of the first resin. There is preferably no contact downstream of the merge area. In another embodiment a volumetric increase in the flow of the first resin controls or prevents its flow. Methods are directed to utilizing the apparatus and for forming a container having a scrap layer substantially devoid of one or more selected resins. The multi-layer extrusion blow-molded article or container has a layer which includes scrap from parison sections which are substantially devoid of the selected resin(s).

REFERENCES:
patent: Re24577 (1958-12-01), Haines
patent: 3023461 (1962-03-01), Sherman
patent: 3457337 (1969-07-01), Turner
patent: 3976226 (1976-08-01), Monnet
patent: 4149839 (1979-04-01), Iwawaki et al.
patent: 4276250 (1981-06-01), Satchell et al.
patent: 4522775 (1985-06-01), Briggs et al.
patent: 4554190 (1985-11-01), McHenry
patent: 4659531 (1987-04-01), Ezaki
patent: 4824618 (1989-04-01), Strum et al.
patent: 4907957 (1990-03-01), Nakagawa et al.
patent: 5030077 (1991-07-01), Orimoto et al.
Iwawaki et al, "Coextrusion-blow molding for gas tanks and industrial parts," Modern Plastics, pp. 70-73, (Mar. 1977).
Luker, Keith, Lab Coextrusion Hardware, "Advances in Extension Technology Seminar," Killion Extruders, Inc., Princeton, NJ, Dec. 2-4, 1987.
"Intermittent coextrusion creates market potential," PM&E (Mar. 1988).
Patent Abstract of Japan vol. 11, No. 321(M-633) Oct. 20, 1987.

Affiliated with

Also associated with

Rating

Extrusion die for extrusion blow molding equipment does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Extrusion die for extrusion blow molding equipment, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Extrusion die for extrusion blow molding equipment will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-190706