# US 5,702,554 A · Process of laminating gold foil and gold foil card

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- Number: US 5,702,554 A
- Document ID: US5702554A
- Status: Granted
- Kind: A
- Application number: 08/583,210
- Filed: 1996-01-04
- Granted: 1997-12-30
- Earliest claimed: 1996-01-04
- Inventors: Edmond Mun Hang Lee
- Web page: https://patentgrep.com/patent/US5702554A

## CPC

- B42D 25/373: Metallic materials
- B32B 15/08: of synthetic resin
- B32B 37/185: {Laminating sheets, panels or inserts between two discrete plastic layers}
- B32B 38/04: Punching, slitting or perforating
- B42D 25/00: Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof (printing processes to produce identification or security features B41M3/14)
- B42D 25/369: Magnetised or magnetisable materials
- B42D 25/46: using pressure
- B32B 2307/412: Transparent
- B32B 2311/04: Gold
- B32B 2425/00: Cards, e.g. identity cards, credit cards
- B42D 2033/32
- Y10T 156/1039: Surface deformation only of sandwich or lamina [e.g., embossed panels]
- Y10T 428/239: Complete cover or casing
- B42D: BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A process of laminating gold foil includes the steps of pressing a gold piece to form an elongated thin gold foil having an even thickness from 0.3 mm to 1 mm; cutting the gold foil to a plurality of gold foil pieces with predetermined size; placing each of the gold foil pieces between two plastic sanding mold sheets having a size larger than the gold foil piece, in which each of the two plastic sanding mold sheets has an interior sanded surface; pressing the two plastic sanding mold sheets onto the two surfaces of the gold foil piece so as to press the surfaces of the gold foil piece to form sanded surfaces; removing the sanded gold foil piece from the pair plastic sanding mold sheets and placing the sanded gold foil piece between two plastic laminating sheets having a size larger than the sanded gold foil piece; heating and pressing the two plastic laminating sheets with the sanded gold foil piece positioning there between, wherein the sanded surfaces of the sanded gold foil piece are integrally attached to the interior surfaces of the two plastic laminating sheets so as to form a rigid laminated gold foil card piece with transparent plastic coating on the two sanded surfaces of the sanded gold foil piece; and cutting the laminated gold foil card piece to remove the plastic fringe to form a gold foil card of predetermined shape and size.

## Claims

### Claim 1

A process of laminating gold foil, comprising the following steps:
(a) pressing a gold piece to form an elongated thin gold foil having a thickness of 0.1 mm to 1 mm;
(b) cutting said elongated thin gold foil into a plurality of gold foil pieces of predetermined size;
(c) placing each of said gold foil pieces between a pair of plastic sanding mold sheets having a size larger than said gold foil piece, in which each of said two plastic sanding mold sheets has an interior sanded surface;
(d) pressing said two plastic sanding mold sheets onto the two surfaces of said gold foil piece respectively by pressing said two plastic sanding mold sheets toward each other, wherein said pair of plastic sanding mold sheets with said gold foil piece therebetween are placed between two plastic molds on a hydraulic press, and said two plastic molds coaxially are driven toward each other to press on said pair of plastic sanding mold sheets, the pressing force applied thereto presses said sanded interior surfaces evenly onto said two surfaces of said gold foil piece due to an elastic and flexible nature of said plastic sanding mold sheets to form two sanded surfaces respectively on said gold foil;
(e) removing said sanded gold foil piece from said pair of plastic sanding molding sheets and placing said sanded gold foil piece between two plastic laminating sheets having a size larger than said sanded gold foil piece;
(f) heating and pressing said two plastic laminating sheets with said sanded gold foil piece positioning therebetween simultaneously, wherein said sanded surfaces of said sanded gold foil piece are integrally attached to two interior surfaces of said two plastic laminating sheets so as to form a rigid laminated gold foil card piece with transparent plastic coating on said two sanded surfaces of said sanded gold foil piece;
(g) cutting said laminated gold foil card piece to remove a plastic fringe formed on the periphery thereof to form a gold foil card of predetermined shape and size; and
(h) printing or pressing predetermined figures and wordings on at least one plastic surface of said laminated gold foil card.

### Claim 2 (depends on 1)

A process of laminating gold foil, as recited in claim 1, further comprising the step of attaching a magnetic tape on at least one said plastic surface of said laminated gold foil card.

### Claim 3 (depends on 1)

A process of laminating gold foil, as recited in claim 1, in which, in step (a), said elongated long and thin gold foil is pressed by two rotating rollers of a rolling machine, wherein said two rollers are aligned in parallel and driven to rotate in opposite direction so as to press said gold piece to reduce the thickness thereof.

### Claim 4 (depends on 2)

A process of laminating gold foil, as recited in claim 2 in which, in step (a), said elongated long and thin gold foil is pressed by two rotating rollers of a rolling machine, wherein said two rollers are aligned in parallel and driven to rotate in opposite direction so as to press said gold piece to reduce the thickness thereof.