Method for molding headliners

• US 6,146,578 A
• Filed: 03/26/1998
• Issued: 11/14/2000
• Est. Priority Date: 10/09/1997
• Status: Expired due to Fees

• Current Assignee: Vantage Technology Corporation
• Original Assignee: Lear Corporation
• Inventors: Byma, George B., Van Ert, Jack M.
• Primary Examiner(s): Silbaugh, Jan H.
• Assistant Examiner(s): Poe, Michael I.
• Application Number:
  US09/048,496
• Time in Patent Office: 964 Days
• Field of Search: 264/510, 264/511, 264/553, 264/554, 264/571, 264/DIG. 65, 264/DIG. 78, 264/313, 264/322, 264/316, 264/101, 425/405.1
• US Class Current: 264/510
• CPC Class Codes: B29C 2791/006 Using vacuum
• CPC Class Codes: B29C 33/20 Opening, closing or clamping
• CPC Class Codes: B29C 33/28 using hydraulic or pneumatic means
• CPC Class Codes: B29C 35/0227 using pressure vessels, e.g. autoclaves, vulcanising pans B29C35/065 takes precedence
• CPC Class Codes: B29C 43/36 Moulds for making articles of definite length, i.e. discrete articles
• CPC Class Codes: B29C 51/082 by shaping between complementary mould parts
• CPC Class Codes: B29C 51/18 Thermoforming apparatus
• CPC Class Codes: B29C 51/30 Moulds
• CPC Class Codes: B29C 51/428 of moulds or mould parts
• CPC Class Codes: B29L 2031/3011 Roof linings
• CPC Class Codes: B32B 37/1018 using only vacuum
• CPC Class Codes: B32B 38/12 Deep-drawing
• CPC Class Codes: B60R 13/0225 self supporting head liners
• CPC Class Codes: Y10S 264/65 Processes of preheating prior to molding
• CPC Class Codes: Y10S 264/78 Processes of molding using vacuum

Abstract

A method for forming a vehicle headliner comprises providing at least one layer of formable material and a cover member; heating the layer and the cover member; providing a mold having a pair of mold halves and a compressible seal disposed between the mold halves, at least one of the mold halves having an aperture and a channel in communication with the aperture; positioning the layer and the cover member between the mold halves; bringing the mold halves toward each other to effect a sealed relationship; and applying a vacuum pressure to the aperture to sufficiently draw the mold halves together and compress the seal, thereby compressing the at least one layer and the cover member together to form the headliner.

Claims

1. A method for thermoforming an article, the method comprising:

providing at least one layer of formable plastic material;

heating the at least one layer of formable plastic material;

inserting the at least one layer of formable plastic material into a mold having first and second thin mold halves, each thin mold half having a non-planar configuration, one thin mold half having at least one aperture in fluid communication with a vacuum source;

moving one of the thin mold halves toward the other thin mold half to effect a sealed relationship between the thin mold halves by compressing a compressible seal disposed about a periphery of one of the thin mold halves; and

applying a vacuum pressure to the at least one aperture by the vacuum source to reduce air pressure within the mold to thereby cause ambient air pressure to forcefully bias the thin mold halves sufficiently together so as to further compress the seal and form the at least one layer of formable plastic material to a contour corresponding to the non-planar configurations of the thin mold halves;

wherein each thin mold half is sufficiently rigid such that the thin mold halves do not substantially flex when the thin mold halves are forcefully biased together, thereby accurately forming the at least one layer of formable plastic material to the contour.

2. The method of claim 1 wherein the at least one layer is air permeable.

3. The method of claim 1 wherein the compressible seal enables the mold halves to be drawn together when the vacuum pressure is applied to the at least one aperture by the vacuum source.

4. The method of claim 1 wherein the heating step comprises preheating the at least one layer prior to inserting the at least one layer into the mold.

5. The method of claim 1 wherein at least one of the mold halves has a flexible portion.

6. The method of claim 1 wherein at least one of the mold halves has at least one pin for holding the at least one layer within the mold.

7. The method of claim 1 wherein at least one of the mold halves has a channel in fluid communication with the at least one aperture.

8. The method of claim 1 further including providing a formable cover member and inserting the cover member into the mold with the at least one layer.

9. The method of claim 1 wherein the mold halves are hinged together.

10. The method of claim 1 wherein each mold half has a thickness of less than 1.0 inches.

11. The method of claim 1 wherein each mold half has a thickness of less than 0.5 inches.

12. The method of claim 1 wherein at least one mold half has a plurality of apertures in communication with the non-planar configuration of the at least one mold half for applying the vacuum pressure.

13. The method of claim 1 wherein each mold half has a plurality of apertures in fluid communication with the non-planar configurations of each mold half for applying the vacuum pressure.

14. The method of claim 1 wherein the heating step comprises heating the at least one layer after inserting the at least one layer into the mold.

15. The method of claim 14 wherein heating comprises blowing steam into the mold.

16. The method of claim 14 wherein heating comprises blowing heated air into the mold.

17. A method for thermoforming a vehicle headliner, the method comprising:

providing at least one layer of formable plastic material and a cover member;

heating the at least one layer of formable plastic material;

providing a mold having first and second thin mold halves and a compressible seal disposed between the thin mold halves and about a periphery of one of the thin mold halves, each of the thin mold halves having a non-planar configuration, at least one of the thin mold halves having at least one aperture in fluid communication with a vacuum source and a channel along a periphery of the mold in fluid communication with the at least one aperture;

positioning the at least one layer of formable plastic material and the cover member between the thin mold halves;

moving one of the thin mold halves toward the other thin mold half to effect a sealed relationship between the thin mold halves;

applying a vacuum pressure to the at least one aperture and the channel by the vacuum source to reduce air pressure within the mold to thereby cause ambient air pressure to forcefully bias the thin mold halves together and compress the seal, thereby compressing the at least one layer of formable plastic material and the cover member together and forming the at least one layer of formable plastic material and the cover member to a contour corresponding to the non-planar configurations of the thin mold halves;

wherein each thin mold half is sufficiently rigid such that the thin mold halves do not substantially flex when the thin mold halves are forcefully biased together, thereby accurately forming the at least one layer of formable plastic material and the cover member to the contour.