Process for manufacturing a body of moisture-proof container for packaging

• US 3,933,559 A
• Filed: 12/26/1973
• Issued: 01/20/1976
• Est. Priority Date: 08/07/1973
• Status: Expired due to Term

• Current Assignee: Dai Nippon Printing Company Limited
• Original Assignee: Dai Nippon Printing Company Limited
• Inventors: Watanabe, Tetsuo
• Primary Examiner(s): Drummond, Douglas J.
• Assistant Examiner(s): Lewris, Basil J.
• Application Number:
  US05/428,410
• Time in Patent Office: 755 Days
• Field of Search: 29/475, 29/527.1, 29/527.2, 29/480, 156/211, 156/222, 156/224, 156/210, 156/212, 156/229, 156/245, 156/253, 156/268, 156/285, 156/292, 156/309, 156/257, 206/42, 206/437, 206/538, 229/3.5 MF, 161/69, 161/113, 161/119, 161/120, 161/127, 161/131, 93/1 D
• US Class Current: 156/211
• CPC Class Codes: B29C 51/14 using multilayered preforms or sheets
• CPC Class Codes: B29K 2705/00 Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
• CPC Class Codes: B32B 15/08 of synthetic resin
• CPC Class Codes: Y10T 156/1026 with slitting or removal of material at reshaping area prior to reshaping
• CPC Class Codes: Y10T 156/1048 to form dished or receptacle-like product
• CPC Class Codes: Y10T 156/1064 Partial cutting [e.g., grooving or incising]

Abstract

A process for manufacturing a body of a moisture-proof container having at least two recesses for packaging purposes which comprises adhering a metal foil to a first thermoplastic resin film with a hot melt-type adhesive to form a laminated sheet, forming at least two closed blank portions in said laminated sheet by cutting only the metal foil, adhering a second thermoplastic resin film on the surface of the metal foil and stretch-forming said closed blank portions of the laminated sheet at a temperature wherein the hot melt-type adhesive and the thermoplastic resin films are softened, thereby forming said recesses.

Claims

1. A process for manufacturing a body of a moisture-proof container having at least two recesses for packaging purposes which comprises adhering a metal foil to a first thermoplastic resin film with a hot melt-type adhesive to form a laminated sheet, forming at least two closed blank portions in said laminated sheet by cutting only the metal foil, adhering a second thermoplastic resin film on the surface of the metal foil and stretch-forming said closed blank portions of the laminated sheet at a temperature wherein the hot melt-type adhesive and the thermoplastic resin films are softened, thereby forming said recesses.

2. The process as claimed in claim 1 wherein the first and second thermoplastic resin films are selected from the group consisting of polyvinyl chloride, polyethylene, polyproylene, a polyester or a polycarbonate.

3. The process as claimed in claim 1, wherein the thickness of the first and second thermoplastic resin film is 100 - 500 μ

.

4. The process as claimed in claim 1, wherein the metal foil is a film selected from the group consisting of aluminium, tin, copper and iron.

5. The process as claimed in claim 1 wherein the thickness of the metal foil is 30 - 150 μ

.

6. The process as claimed in claim 1 wherein the hot melt type adhesive comprises a main component selected from the group consisting of ethylenevinylacetate copolymer, polyvinyl acetate, polyvinylbutyral, polyethylene and a polyamide and an additive.

7. The process of claim 6, wherein the additive is selected from the group consisting of a rosin, an ester gum and a paraffin.

8. The process as claimed in claim 1 wherein the thickness of the hot melt type adhesive is 3 - 30 μ

.

9. The process of claim 1, wherein the thickness of the first and second thermoplastic resin film is 150 - 300 microns.

10. The process of claim 1, wherein the thickness of the first and second thermoplastic resin film is 150 - 200 microns.

11. The process of claim 1, wherein the thickness of the metal foil is 40 - 70 microns.

12. The process of claim 1, wherein the thickness of the hot melt-type adhesive is 10 - 15 microns.

13. The process of claim 1, wherein a third thermoplastic resin film is adhered to the second thermoplastic film and the blank portions are made by cutting the metal foil and the second thermoplastic resin film.

14. The process of claim 1, wherein the second thermoplastic resin film is adhered to the metal foil with an adhesive selected from the group consisting of a saturated polyester type adhesive and a saturated polyester-isocyanate type adhesive.

15. The process of claim 14, wherein the thickness of the adhesive is 10 - 15 microns.