Method of decorating a molded article

• US 6,929,771 B1
• Filed: 07/31/2000
• Issued: 08/16/2005
• Est. Priority Date: 07/31/2000
• Status: Expired due to Fees

• Current Assignee: High Voltage Graphics, Inc.
• Original Assignee: High Voltage Graphics, Inc.
• Inventors: Abrams, Louis Brown
• Primary Examiner(s): Lee, Edmund H.
• Application Number:
  US09/629,746
• Time in Patent Office: 1,842 Days
• Field of Search: 264/511, 264/135, 264/243, 264/247, 264/250, 264/257, 264/275, 264/265
• US Class Current: 264/511
• CPC Class Codes: B29B 11/10 Extrusion moulding
• CPC Class Codes: B29C 2049/2412 outside the article
• CPC Class Codes: B29C 2049/2429 Multilayered labels
• CPC Class Codes: B29C 33/68 Release sheets
• CPC Class Codes: B29C 41/04 Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould
• CPC Class Codes: B29C 41/20 incorporating preformed parts or layers, e.g. moulding inserts or for coating articles
• CPC Class Codes: B29C 45/14065 Positioning or centering articles in the mould
• CPC Class Codes: B29C 45/14811 Multilayered articles B29C45/14827 takes precedence
• CPC Class Codes: B29C 45/16 Making multilayered or multicoloured articles B29C45/0062 takes precedence; feeding colouring materials into the injection unit B29C45/1816
• CPC Class Codes: B29C 49/24 Lining or labelling
• CPC Class Codes: B29C 67/246 Moulding high reactive monomers or prepolymers, e.g. by reaction injection moulding [RIM], liquid injection moulding [LIM] casting monomers B29C39/006, mixing construction B29B7/74
• CPC Class Codes: B29K 2713/00 Use of textile products or fabrics for preformed parts, e.g. for inserts B29K2105/06 takes precedence
• CPC Class Codes: B29K 2715/006 Glues or adhesives, e.g. hot melts or thermofusible adhesives

Abstract

A method of providing a molding article with a plush surface is provided. The method includes providing a flocked transfer, securing the transfer in place in a mold, and molding the article such that the transfer is embedded in the surface of the article. The article can be injection molded.

Claims

1. A method of decorating a molded article comprising:

providing a transfer having a flocking layer, a release sheet on one side of the flocking layer and a layer of a permanent adhesive on an opposite side of the flocking layer to adhere the transfer to the molded article;

securing the release sheet to an interior wall of a mold in which the article is made; and

molding a part from a resin such that the resin contacts the layer of permanent adhesive, wherein the permanent adhesive does not liquefy and ooze out around the flock during molding;

cooling the mold;

ejecting the part; and

removing the release sheet from the transfer.

2. The method of claim 1 wherein the release sheet is affixed to the mold base with an adhesive.

3. The method of claim 1 wherein the permanent adhesive is a thermosetting polyester.

4. The method of claim 1 wherein the permanent adhesive cross links with the resin in the molding step.

5. The method of claim 4 including a step of preventing the resin from entering interstitial spaces between the flock fibers in the flocking layer and wherein the preventing step includes forming a dam around the perimeter of the transfer.

6. The method of claim 5 wherein the dam is formed by placing a barrier in the mold, the transfer being positioned within the barrier.

7. The method of claim 4 wherein the dam is part of the transfer, the dam comprising a built up section of a binder adhesive around the periphery of the transfer.

16. The method of claim 1 wherein the permanent adhesive is a layer of binder adhesive.

17. The method of claim 1 wherein the permanent adhesive is a tie coat material.

42. The method of claim 1 wherein the permanent adhesive is free of a hot melt adhesive.

54. The method of claim 1 further comprising before the molding step:

forming the transfer into a nonplanar, three-dimensional shape, wherein there is no hot melt adhesive layer located between the permanent adhesive and resin.

8. A method of decorating a molded article comprising:

coating a release sheet with a release adhesive;

flocking flock into said release adhesive by embedding a first end of said flock into the release adhesive to result in at least one pattern of flock arranged to form a predetermined design adhered to said release sheet having the release adhesive, flock and permanent adhesive thereon;

applying a permanent adhesive to an opposite side of the flocking;

affixing said release sheet to the interior surface of a mold; and

introducing a molten resin in said mold to form the molded article;

said permanent adhesive permanently bonding said flock to said article, wherein, under the thermal conditions experienced by the permanent adhesive during molding, the permanent adhesive does not liquefy and ooze out around the flock and wherein the permanent adhesive is positioned between the flock and the resin and cross-linked with a polymer material in a portion of the molded article.

9. The method of claim 8 wherein the permanent adhesive is cross linked with the resin.

10. The method of claim 8 further comprising providing a dam on the surface of the mold, the transfer being applied to the mold within the dam.

11. The method of claim 8 wherein the step of molding the article comprises injecting molten resin into the mold and wherein the permanent adhesive is free of a hot melt adhesive.

12. The method of claim 11 wherein the resin is initially injected at a first pressure, the first pressure being sufficiently low to prevent dislodgment of the transfer from the mold wall;

and then providing a second injection of the resin at a second higher pressure.

13. The method of claim 11 wherein the injected resin has a lower melting point than the release adhesive.

14. The method of claim 8 wherein said step of molding said article over said permanent adhesive comprises molding a surface of said article over said permanent adhesive;

said surface being a contoured surface.

15. The method of claim 8 wherein said step of molding said article over said permanent adhesive comprises molding a surface of said article over said permanent adhesive;

said surface being a generally flat surface.

18. The method of claim 11 wherein the permanent adhesive is a thermosetting polymer.

19. The method of claim 8 wherein the permanent adhesive is a binder adhesive which adhesively holds said transfer to said article.

20. The method of claim 8 wherein said permanent adhesive is a thermosetting adhesive;

said thermosetting adhesive cross-linking with the molded article to hold said transfer to said article.

21. The method of claim 8 wherein said permanent adhesive is a tie coat material.

43. The method of claim 8 wherein the permanent adhesive is free of a hot melt adhesive.

55. The method of claim 8 further comprising before the molding step:

forming the design into a nonplanar, three-dimensional shape and wherein there is no hot melt adhesive layer located between the permanent adhesive and resin.

22. A method for producing a decorated molded article, comprising:

providing a flocked structure, the flocked structure comprising a plurality of flock fibers adhered to a permanent adhesive;

positioning the flocked structure in a part of a mold;

introducing a molten resin into the mold while the flocked structure is positioned in the mold; and

after solidification of the resin, removing from the mold the decorated molded article comprising the flocked structure, wherein a melting temperature of the permanent adhesive is greater than the maximum temperature experienced by the permanent adhesive during the introducing step, wherein the decorated molded article comprises the flock fibers and permanent adhesive and a molded part, wherein the permanent adhesive is positioned between the flock fibers and the molded part, and wherein the permanent adhesive is cross-linked with a polymer material in a portion of the molded part.

23. The method of claim 22, wherein the permanent adhesive is free of a hot melt adhesive and wherein the introducing step comprises the substep of:

cooling the mold to cause solidification of the resin.

24. The method of claim 22, wherein the flocked structure comprises multiple colors of flock fibers defining a decorative design and wherein the permanent adhesive crosslinks with the molten resin.

25. The method of claim 22, wherein the flock fibers are resilient and wherein there is no hot melt adhesive layer between the flock fibers and polymer material.

26. The method of claim 22, wherein the flock fibers are at least one of rayon, nylon, and polyester.

27. The method of claim 22, further comprising:

electrostatically depositing the flock fibers onto an adhesive-coated substrate to form the flocked structure.

28. The method of claim 22, wherein the permanent adhesive is a thermosetting polyester coating lower ends of the flock fibers.

29. The method of claim 22, further comprising:

maintaining the flocked structure stationary in the closed mold during the introducing step.

30. The method of claim 29, wherein the maintaining step is performed using a vacuum.

31. The method of claim 22, wherein the flocked structure comprises:

a dimensionally stable sheet;

the plurality of flock fibers;

a first release adhesive attaching the plurality of flock fibers to the dimensionally stable sheet; and

the permanent adhesive coating lower ends of the plurality of flock fibers.

32. The method of claim 31, wherein the dimensionally stable sheet is in contact with a surface of the closed mold and the permanent adhesive is a binder adhesive.

33. The method of claim 32, wherein a second release adhesive is positioned on an opposite side of the dimensionally stable sheet from the first release adhesive to locate the flocked surface in position inside the mold.

34. The method of claim 22, wherein the mold comprises a depression sized to receive the flocked surface.

35. The method of claim 31, wherein a melting point of the first release adhesive is higher than a melting point of the resin.

36. The method of claim 22, wherein the introducing step is performed by an injection molding technique.

37. The method of claim 22, wherein the introducing step is performed by one of the following techniques:

reaction injection molding, blow molding, rotational molding, and transfer molding.

38. The method of claim 22, wherein the introducing step comprises:

first introducing a first resin into the closed mold at a first pressure; and

second introducing a second resin into the closed mold at a second pressure, wherein the first pressure is less than the second pressure.

39. The method of claim 31, further comprising after the removing step:

removing the dimensionally stable sheet from the decorated molded article.

40. The method of claim 31, wherein the permanent adhesive is at least one of a thermosetting adhesive and a water based latex.

41. The method of claim 22, wherein the closed mold comprises a raised surface surrounding at least a portion of the flocked surface to prevent the resin from contacting the flock fibers.

44. The method of claim 22 wherein the permanent adhesive is free of a hot melt adhesive.

56. The method of claim 22 further comprising before the introducing step:

forming the flocked structure into a nonplanar, three-dimensional shape and wherein there is no hot melt adhesive layer located between the permanent adhesive and molded part.

45. A method for producing a molded article, comprising:

providing a flocked structure, the flocked structure comprising a plurality of flock fibers and a permanent adhesive;

positioning the flocked structure in a part of the mold;

introducing a molten resin into the mold while the flocked structure is positioned in the mold to form the decorated molded article, the decorated molded article comprising a molded part, the flock fibers, and permanent adhesive, wherein the molded part comprises the resin, wherein the permanent adhesive is positioned between the flock fibers and the molded part, wherein there is no hot melt adhesive layer located between the permanent adhesive and molded part, and wherein, at the maximum temperature experienced by the permanent adhesive in the mold, the permanent adhesive does not ooze out around the flock fibers.

46. The method of claim 45 wherein the permanent adhesive is one of a tie coat material, a binder adhesive, and a thermosetting polyester and wherein a melting temperature of the permanent adhesive is greater than temperatures experienced by the permanent adhesive in the mold and wherein the permanent adhesive cross links with the resin, wherein the permanent adhesive is bonded to the molded part, and wherein there is no hot melt layer between the flock fibers and molded part.

47. The method of claim 45 wherein the permanent adhesive is free of a hot melt adhesive.

48. The method of claim 45 wherein the permanent adhesive is a thermosetting polyester.

49. The method of claim 45 wherein the flocked structure is a transfer and comprises a release sheet and a release adhesive positioned on a first surface defined by ends of the plurality of flock fibers, wherein the permanent adhesive is located on a second surface defined by ends of the plurality of flock fibers, and wherein the first and second surfaces are opposed to one another.

50. The method of claim 49 wherein the release sheet contacts an interior wall of the mold cavity.

51. The method of claim 50 wherein the release sheet is affixed to the interior wall with a second release adhesive.

52. The method of claim 45 wherein the permanent adhesive is a tie coat material.

53. The method of claim 45 wherein the permanent adhesive is a binder adhesive.

57. The method of claim 45 further comprising before the introducing step:

forming the flocked structure into a nonplanar, three-dimensional shape, wherein there is no hot melt layer between the permanent adhesive and molded part.