Hot lamination process for the manufacture of a combination contact/contactless smart card

• US 6,514,367 B1
• Filed: 08/05/1999
• Issued: 02/04/2003
• Est. Priority Date: 10/17/1995
• Status: Expired due to Term

• Current Assignee: Brian P. King, Carl J. Niedzwiecki, Catherine M. Niedzwiecki, Constance J. Januzzi, Keith R. Leighton, Lois Leighton, Roland A. Januzzi
• Original Assignee: Leighton Technologies LLC (General Patent Corporation)
• Inventors: Leighton, Keith R.
• Primary Examiner(s): AFTERGUT, JEFFRY H
• Application Number:
  US09/368,846
• Time in Patent Office: 1,279 Days
• Field of Search: G06/K 1.9077, 156/277, 156/153, 156/555, 156/154
• US Class Current: 156/153
• CPC Class Codes: B32B 2305/342 Chips
• CPC Class Codes: B32B 2309/02 Temperature
• CPC Class Codes: B32B 2309/022 Temperature vs pressure profiles
• CPC Class Codes: B32B 2309/025 Temperature vs time profiles
• CPC Class Codes: B32B 2309/04 Time
• CPC Class Codes: B32B 2309/12 Pressure
• CPC Class Codes: B32B 2310/0831 using UV radiation
• CPC Class Codes: B32B 2327/06 PVC, i.e. polyvinylchloride
• CPC Class Codes: B32B 2425/00 Cards, e.g. identity cards, credit cards
• CPC Class Codes: B32B 2519/02 RFID tags
• CPC Class Codes: B32B 37/185 Laminating sheets, panels or inserts between two discrete plastic layers
• CPC Class Codes: B32B 38/06 Embossing
• CPC Class Codes: B32B 38/145 Printing
• CPC Class Codes: G06K 19/07718 the record carrier being manufactured in a continuous process, e.g. using endless rolls
• CPC Class Codes: G06K 19/07745 Mounting details of integrated circuit chips
• CPC Class Codes: G06K 19/07749 the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
• CPC Class Codes: G06K 19/07769 the further communication means being a galvanic interface, e.g. hybrid or mixed smart cards having a contact and a non-contact interface
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H05K 2203/0228 Cutting, sawing, milling or shearing
• CPC Class Codes: H05K 2203/068 : Features of the lamination press or of the lamination process, e.g. using special separator sheets
• CPC Class Codes: H05K 2203/1105 : Heating or thermal processing not related to soldering, firing, curing or laminating, e.g. for shaping the substrate or during finish plating
• CPC Class Codes: H05K 3/0044 : Mechanical working of the substrate, e.g. drilling or punching H05K3/0008 takes precedence
• CPC Class Codes: H05K 3/281 : by means of a preformed insulating foil H05K3/284 takes precedence
• CPC Class Codes: H05K 3/284 : for encapsulating mounted components H05K1/185 takes precedence
• CPC Class Codes: Y10T 156/108 : Flash, trim or excess removal

Abstract

A plastic smart card, such as a card having a radio frequency identification (RFID) proximity function, including at least one electronic element embedded therein and a physical contact card function and the hot lamination process for the manufacture of this dual function smart card and other plastic cards including a micro-chip embedded therein. The process results in a card having a preferred overall thickness in the range of 0.028 inches to 0.032 inches with a surface suitable for receiving dye sublimation printing—the variation in card thickness across the surface should not exceed 0.0005 inches. A card manufactured in accordance with the present invention also complies with all industry standards and specifications. Also, the hot lamination process of the present invention results in an aesthetically pleasing card. The invention also relates to a plastic card formed in accordance with the hot lamination process of the present invention.

Claims

1. A process for incorporating at least one electronic element in the manufacture of a plastic card, comprising the steps of:

(a) providing first and second plastic core sheets;

(b) positioning said at least one electronic element in the absence of a non-electronic carrier directly between said first and second plastic core sheets to form a core, said plastic core sheets defining a pair of inner and outer surfaces of said core;

(c) positioning said core in a laminator apparatus, and subjecting said core to a heat and pressure cycle, said heat and pressure cycle comprising the steps of;

(i) heating said core for a first period of time;

(ii) applying a first pressure to said core for a second period of time such that said at least one electronic element is encapsulated by said core;

(iii) cooling said core while applying a second pressure to said core, the second pressure being at least 10% greater than the first pressure; and

(d) milling a region of said core to a controlled depth so as to form a cavity which exposes at least one contact pad of said at least one electronic element.

2. The process for incorporating at least one electronic element in the manufacture of a plastic card as recited in claim 1, wherein said laminator apparatus has first and second laminating plates, at least one of said first and second laminating plates having a matte finish for creating a textured surface on at least one of said outer surfaces of said core.

3. The process for incorporating at least one electronic element in the manufacture of a plastic card as recited in claim 2, wherein each of said first and second laminating plates has a matte finish for creating said textured surface on both of said outer surfaces of said core.

4. The process for incorporating at least one electronic element in the manufacture of a plastic card as recited in claim 1, wherein said first and second plastic core sheets are made from a material selected from the group consisting of polyvinyl chloride, polyester, and acrylonitrile-butadiene-styrene, each of said sheets having a thickness in the range of 0.007 to 0.024 inch.

5. The process for incorporating at least one electronic element in the manufacture of a plastic card as recited in claim 4, wherein said first and second plastic core sheets have a thickness of approximately 0.0125 inch.

6. The process for incorporating at least one electronic element in the manufacture of a plastic card as recited in claim 1, wherein said second pressure ranges from about 10% to about 40% greater than said first pressure.

7. A process as recited in claim 1 having a further step following step(c), said step comprising:

positioning a layer of overlaminate film on at least one of said surfaces of said core, positioning said overlaminate film and said core in a laminator apparatus and laminating said layer of overlaminate film to said core in said laminator to thereby form a sheet of plastic card stock.

8. The process of claim 7, further comprising the step of coating said at least one surface of said core with a layer of ink prior to positioning said overlaminate film on said at least one surface of said core.

9. The process for incorporating at least one electronic element in the manufacture of a plastic card as recited in claim 1, wherein said core is heated in step (c)(i) to a temperature in the range of 275°

F. to 400°

F. and said first period of time is at least five (5) minutes.

10. The process for incorporating at least one electronic element in the manufacture of a plastic card as recited in claim 1, wherein said first pressure is approximately 450 p.s.i. and said second period of time is at least 10 minutes.

11. The process for incorporating at least one electronic element in the manufacture of a plastic card as recited in claim 1, wherein a coating step is carried out on at least one surface of said core utilizing a printing press.

12. The process for incorporating at least one electronic element in the manufacture of a plastic card as recited in claim 1, wherein a coating step is carried out on at least one surface of said core utilizing a coating technique selected from the group consisting of silk screen printing, offset printing, letterpress printing, screen printing, roller coating, spray printing, and litho-printing.

13. The process for incorporating at least one electronic element in the manufacture of a plastic card as recited in claim 1, having a further step after said step (c) comprising:

(a) positioning an overlaminate film on said at least one surface of said core;

(b) subjecting said core to a heat and pressure cycle comprising the steps of;

(i) heating said core to a temperature between approximately 175°

F. to 300°

F. for approximately 10 to 25 minutes;

(ii) applying approximately 1000 p.s.i. pressure to said core; and

(iii) cooling said core to a temperature in the range of approximately 40°

F. to 65°

F. for approximately 10 to 25 minutes.

14. The process of claim 13, further comprising the step of coating said at least one surface of said core with a layer of ink prior to positioning said overlaminate film on said at least one surface of said core.

15. A process as recited in claim 1 comprising the further step of inserting a second electronic element into said cavity, the second electronic element being in electrical communication with the at least one electronic element.

16. The process for incorporating at least one electronic element in the manufacture of a plastic card as recited in claim 1, wherein said at least one electronic element is a micro-chip and an associated circuit board antenna or an associated wire antenna.

17. The process for incorporating at least one electronic element in the manufacture of a plastic card as recited in claim 1, wherein said at least one electronic element is a read/write integrated chip and an associated antenna.

18. The process according to claim 1, wherein the pressure on said core in step (c)(i) is less than 10 p.s.i.

19. The process according to claim 1, wherein said core is heated in step (c)(ii).

20. A process for incorporating at least one electronic element in the manufacture of a plastic card, comprising the steps of:

(a) providing first and second plastic core sheets;

(b) positioning said at least one electronic element in the absence of a non-electronic carrier directly between said first and second plastic core sheets to form a core, said plastic core sheets defining a pair of inner and outer surfaces of said core;

(c) positioning said core in a laminator apparatus, and subjecting said core to a heat and pressure cycle, said heat and pressure cycle comprising the steps of;

(i) heating said core for a first period of time;

(ii) applying a first pressure to said core for a second period of time such that said at least one electronic element is encapsulated by said core;

(iii) cooling said core while applying a second pressure to said core, the second pressure being at least 10% greater than the first pressure.

21. The process according to claims 20, further comprising:

forming a cavity in said core.

22. The process according to claim 21, wherein the step of forming a cavity in said core comprises:

after step (c), milling a region of said core to a controlled depth so as to form a cavity which exposes at least one contact pad of said at least one electronic element.

23. The process according to claim 22, further comprising:

inserting a second electronic element into said cavity, the second electronic element being in electrical communication with the at least one electronic element.