Molding Method For Thin Parts

• US 20100013130A1
• Filed: 07/18/2008
• Published: 01/21/2010
• Est. Priority Date: 07/18/2008
• Status: Abandoned Application

• Current Assignee: Dell Products LP (Dell Technologies Inc.)
• Original Assignee: Dell Products LP (Dell Technologies Inc.)
• Inventors: Mundt, Kevin, Ramirez, Ernesto
• Application Number:
  US12/175,488
• Publication Number:
  US 20100013130A1
• Time in Patent Office: Days
• US Class Current: 264/544
• CPC Class Codes: B29C 2043/3444 using pressurising feeding means located in the mould, e.g. plungers or pistons
• CPC Class Codes: B29C 43/34 Feeding the material to the mould or the compression means B29C43/085 takes precedence
• CPC Class Codes: B29C 44/0415 by regulating the pressure of the material during or after filling of the mould, e.g. by local venting
• CPC Class Codes: B29C 45/1704 the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles B29C45/1732 and B29C45/1734 take precedence; injection blow-moulding B29C49/06
• CPC Class Codes: B29C 45/561 Injection-compression moulding

Abstract

A method for molding a part includes introducing a gas into a material that is in a liquid phase. A mold is then positioned in an intermediate position The material, in the liquid phase and including the introduced gas, is then injected into the mold. The mold is then positioned in a closed position such that the material that was injected into the mold is compressed by the mold.

Claims

1. A molding system, comprising:

a material supply system that comprises a gas introduction device, wherein the material supply system further comprises components that are operable to supply a material in a liquid phase to the gas introduction device, and the gas introduction device is operable to introduce a gas into the material in the liquid phase; and

a mold coupled to the material supply system, wherein in the mold is operable to receive the material, in the liquid phase and including the introduced gas, into a first mold volume that is defined by the mold, and the mold is further operable to compress the material located in the first mold volume into a second mold volume that is defined by the mold such that at least some of the introduced gas in the material is removed from the material.

2. The system of claim 1, wherein the material supply system comprises a material phase change device that is operable to convert the material to the liquid phase.

3. The system of claim 2, wherein the material supply system comprises a material storage that is coupled to the material phase change device, and wherein the material storage is operable to provide the material in a solid phase to the material phase change device.

4. The system of claim 1, wherein the first mold volume is defined by the mold in a intermediate position, and the second mold volume is defined by the mold in a closed position.

5. The system of claim 1, wherein the gas comprises an inert gas.

6. The system of claim 1, wherein the material comprises a plastic resin.

7. The system of claim 1, wherein the second mold volume comprises a thin-wall section and at least one rib section.

8. A method for molding a part, comprising:

introducing a gas into a material that is in a liquid phase;

positioning a mold in an intermediate position;

injecting the material, in the liquid phase and including the introduced gas, into the mold; and

positioning the mold in a closed position such that the material that was injecting into the mold is compressed by the mold and at least some of the introduced gas in the material is removed from the material.

9. The method of claim 8, wherein the gas comprises an inert gas.

10. The method of claim 8, wherein the material comprises a plastic resin.

11. The method of claim 8, wherein the mold defines a mold volume in the closed position that comprises a thin-wall section and at least one rib.

12. The method of claim 8, further comprising:

providing the material in a solid phase.

13. The method of claim 12, further comprising:

converting the material to the liquid phase.

14. The method of claim 8, further comprising:

cooling the liquid phase material in the mold while the mold is in the closed position in order to convert the liquid phase material to a solid phase material and produce a part.

15. The method of claim 14, wherein the part comprises a first section of the material in a homogenous solid phase and a second section of the material in a solid phase that includes a plurality of gas bubbles throughout the second section.

16. A method for molding a part, comprising:

providing a mold that comprises a first section and a second section, wherein the first section is moveable relative to the second section;

moving the first section relative to second section to define a first mold volume between the first section and the second section;

injecting a liquid phase material that comprises a plurality of gas bubbles into the first mold volume; and

compressing the liquid phase material that comprises the plurality of gas bubbles by moving first section relative to the second section to define a second mold volume that is smaller that the first mold volume and that comprises a thin-wall section and a rib section, wherein the compressing the liquid phase material further comprises removing at least some of the plurality of gas bubbles from the liquid phase material that is located in the thin-wall section.

17. The method of claim 16, further comprising:

cooling the liquid phase material that is located in the second mold volume in order to convert the liquid phase material to a solid phase material and produce a part.

18. The method of claim 16, wherein the plurality of gas bubbles comprise an inert gas.

19. The method of claim 16, further comprising:

converting the material to the liquid phase.

20. The method of claim 19, further comprising:

introducing the gas bubbles into the liquid phase material.