Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Producing multilayer work or article
Patent
1990-01-26
1991-07-23
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Producing multilayer work or article
264541, 264173, 4251331, 425532, 425381, 425462, 425466, B29C 4706
Patent
active
050341790
ABSTRACT:
In the discontinuous manufacture of multilayer, co-extruded, hose-like thermoplastics material preforms used in the production of large volume multilayer hollow members in a divided blow mold, at least two different annular shaped material melts are brought together in series within an axially extending annular piston to form a multilayer material melt. An annular flow channel in the piston receives the layers of material melt. The flow channel widens in a funnel-like manner toward an annular storage space. The preform is subsequently ejected from the storage space through an annular nozzle gap by the annular piston moving in its axial direction. The annular piston acts as a co-extrusion head and is pressed upward by the multilayer material melts. In supplying the material melts from extruders into the flow channel of the piston, the material melts flow first in the extrusion direction and then are redirected for flow radially inwardly into the flow channel of the piston. By the redirection of the material melts in the transition from the extruder to the co-extruder or piston, no cross-sectional changes occur and weak points are eliminated or reduced to a point where they have no deleterious effect.
REFERENCES:
patent: 4548568 (1985-10-01), Herbert et al.
patent: 4548569 (1985-10-01), Pitigliano et al.
patent: 4758144 (1988-07-01), Becker
patent: 4770620 (1988-09-01), Steinecke et al.
patent: 4838778 (1989-06-01), Becker et al.
patent: 4846648 (1989-07-01), Spence et al.
patent: 4937035 (1990-06-01), Richter
LandOfFree
Method of and apparatus for discontinuous manufacture of multila does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of and apparatus for discontinuous manufacture of multila, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of and apparatus for discontinuous manufacture of multila will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-431298