Plastic article or earthenware shaping or treating: apparatus – Diverse distinct type shaping means – Shaping orifice and either a downstream preform reshaping...
Patent
1995-04-30
2000-04-18
Pyon, Harold
Plastic article or earthenware shaping or treating: apparatus
Diverse distinct type shaping means
Shaping orifice and either a downstream preform reshaping...
4251331, 425192R, 425336, 425377, 425380, 425381, 425392, B29C 4722
Patent
active
060508051
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to apparatus for forming elongate thermoplastics material extrusion especially to apparatus for forming thermoplastics material profiled pipe such as helically or annularly ribbed or corrugated pipe. In large extrusion apparatus requiring alignment between the die and downstream equipment, it is conventional to adjust the position of the extruder carrying the die or the position of the downstream equipment, or both. The downstream equipment may be, for example, tooling, tooling dies, sizing tables, etc.
For example, when forming pipe in a mold tunnel, extrudate is extruded through an elongate nozzle of annular cross section into the tunnel to form the pipe. It is very important that the elongate nozzle be axially aligned with the tunnel so that even thickness of extrudate is deposited evenly on the walls of the tunnel. This has presented a considerable problem in the art.
The machinery involved for making pipe of large diameter, say, for example, a diameter of more than one foot, is very massive. When even larger diameter pipe is needed the machinery is even more massive. Nevertheless, it is conventional to align the elongate nozzle either by adjustment of the position of the extruder which carries the die and the nozzle and/or by adjustment of the position of the mold tunnel.
Further problems have occurred in centering a mandrel within an outer casing of the elongate nozzle to ensure that the extrudate itself emerges having uniform thickness of the wall around its periphery. These subsidiary problems, however, may be approached by providing means for centering the mandrel within the nozzle casing. It is not these subsidiary problems concerning the thickness of the wall of the extrudate which are the concern of the present inventor, but the more basic problem of properly aligning the nozzle with the mold tunnel without the need for adjusting the position of very large pieces of machinery.
Conventionally, in order to adjust the relative position of downstream apparatus with respect to upstream apparatus, it may be necessary to move the relatively massive upstream apparatus or the relatively massive downstream apparatus in both lateral and vertical directions. This may involve a large number of adjusting mechanisms all of which must be relatively sophisticated and heavy duty.
In apparatus for making profiled pipe, for example, annularly or helically ribbed or corrugated double walled pipe, whether the extruder is an in-line feed extruder or a side-feed extruder is an in-line feed extruder or a side-feed extruder, it has been conventional that the die be fixed in position with respect to the extruder. Thus, it has not been possible to adjust the position of the die and elongate extrusion nozzle with respect to the extruder.
It is possible to provide some minor range of adjustment of the extrusion nozzle casing, i.e. the outer casing of the extrusion nozzle with respect to the die casing. The purpose of this range of adjustment is to solve the subsidiary problems referred to above, i.e. to center the extrusion nozzle casing around the mandrel which forms the inner wall of a delivery passage for extrudate and thus allow for the delivery of an extrudate having constant wall thickness. It will be appreciated that relative movement between the extrusion nozzle casing and the mandrel will affect the wall thickness of the extrudate. Movement of the whole extruder including the die, the extrusion nozzle and its inner mandrel will, however, not affect the adjustment between the extrusion nozzle and its inner mandrel.
For whatever reason, it is wholly conventional in the extrusion art as known that adjustment of the upstream and downstream equipment involve the adjustment of the main upstream apparatus and/or the main downstream apparatus.
The present inventor has addressed the problem which arises in adjustment of the massive extruder and mold tunnels.
Since the die together with the extrusion nozzle casing and its associated mandrel is, even when large diameter pipe is t
REFERENCES:
patent: 1368658 (1921-02-01), Royle
patent: 3357051 (1967-12-01), Zolotarevsky
patent: 4846660 (1989-07-01), Drossbach
patent: 4995800 (1991-02-01), Lupke
patent: 5123827 (1992-06-01), Lupke
patent: 5511964 (1996-04-01), Hegler et al.
Leyson Joseph
Pyon Harold
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