Apparatus for parison extrusion专利检索-塑性收缩建筑材料专利检索查询-专利查询网

Apparatus for parison extrusion

阅读：783发布：2023-03-26

专利汇可以提供Apparatus for parison extrusion专利检索，专利查询，专利分析的服务。并且A process and apparatus for programming the wall thickness of thermoplastic parison extrusions for subsequent conversion to blow-molded plastic articles. The apparatus for forming the parison includes a mandrel or core pin and a die assembly wherein the mandrel is made from a material having predictable and repeatable elastic properties and has enclosed therein a piston and piston rod. The piston rod extends the full length of the mandrel and is connected to the piston on the rod''s opposite end. The piston is contained in a chamber that is connected to a hydraulic fluid source. The wall thickness of the formed parison is changed by varying the size of the extrusion orifice through expansion or contraction of the mandrel produced by the application or release of hydraulic pressure on the top of the piston. The die assembly is particularly suited for extrusion of parisons from heat sensitive thermoplastic material such as polyvinyl chloride since no sliding surfaces are utilized which are known to trap and cause degradation of heat sensitive thermal plastics.，下面是Apparatus for parison extrusion专利的具体信息内容。

权利要求

1. A die assembly for use in the extrusion of tubular parisons of plastic material comprising, in combination: a hollow body having an inlet and an outlet for flow of plastic material through the body, the interior walls of said hollow body defining a bore in fixed relation to and communicating with said outlet; a core pin disposed in said bore to define an annular orifice for extrusion of said parison, said core pin being composed of an expansionable metal, said core providing in its interior an axially aligned cavity having an enlarged portion at the upper end thereof; a means for elongating said core pin comprising a piston rod received in said cavity and having its upper end connected to a piston provided in the enlarged portion, the lower end of said rod touching the bottom of said cavity inside said core pin; and means to permit fluid flow in and out of said enlarged upper portion of said cavity whereby pressure can be applied through said piston and piston rod to produce axial elongation of said core pin to change the width of said annular orifice.

2. The die assembly of claim 1, wherein said core pin and body are so constructed as to define an annular orifice which decreases in width when the core pin is elongated.

3. The die assembly of claim 1, including means for varying the pressure applied to the piston in downward relation to the discharge of the plastic material from said orifice, whereby parisons are formed having wall thickness of predetermined varying dimensions in relation to the length of the parison being extruded.

4. The die assembly of claim 1, wherein the core pin is constructed of titanium metal.

5. The die assembly of claim 1, wHerein the terminal end of said core pin provides an inwardly inclined surface and the outlet end of said bore provides a matching inclined surface whereby elongation of said core pin causes said inclined surfaces to approach each other thereby reducing the width of said annular orifice.

6. The die assembly of claim 1, wherein the terminal end of said core pin provides an outwardly inclined surface and the outlet end of said bore provides a matching inclined surface whereby elongation of said core pin causes said inclined surfaces to separate from each other thereby increasing the width of said annular orifice.

7. In a die assembly for extruding plastic parisons the combination comprising: a. a body having a bore therethrough defining an inlet and an outlet for the flow of plastic material through said body; b. a core pin disposed in said bore to define an orifice at said outlet for the extrusion of said parison; i. said core pin being constructed of a material having a low modulus of elasticity and providing in its interior an axially aligned cavity; c. a means for elongating said core pin comprising a piston rod received in said cavity, i. the lower end of said piston rod contacting said core pin adjacent its lower end; and d. means to permit application of fluid pressure to the upper end of said piston rod to produce a change in length of said core pin thereby varying the width of said orifice.

8. In the die of claim 7 wherein said cavity has an enlarged portion at its upper end and a piston connected to the upper end of said piston rod slidably received in said enlarged portion.

9. In the die of claim 7 wherein means are provided for applying fluid pressure to either side of said piston to produce a change in the length of said core pin.

10. In the die of claim 7 wherein the outlet end of said body is provided with a separate adjustable bushing.

11. In the die of claim 10 wherein said bushing is threadably coupled to said outlet end of said body.

12. In the die of claim 11 wherein opposed recesses are provided in the inner wall of said bushing and said outlet end and an annular spacer ring is received in said recesses.

13. In the die of claim 7 wherein the lower end of said core pin is provided with a separate adjustable tip.

14. In the die of claim 13 wherein said tip is threadably coupled to said lower end of said core pin.

15. In the die of claim 13 wherein said tip is coupled to said lower end of said core pin by means of a bolt threadably engaging said lower end.

16. In the die of claim 15 wherein a spacer washer is received between said separable tip and the lower end of said core pin.

17. In the die of claim 7 wherein said core pin is provided with a separate enlarged upper portion threadably connected to an elongated lower portion.

说明书全文

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