Method of multistage digital proofing with dimensional consistency

• US 6,087,060 A
• Filed: 05/12/1999
• Issued: 07/11/2000
• Est. Priority Date: 05/12/1999
• Status: Expired due to Fees

• Current Assignee: Presstek Incorporated (MAI Holdings, Inc.)
• Original Assignee: Presstek Incorporated (MAI Holdings, Inc.)
• Inventors: Benner, Gary, Dalzell, James, Zerillo, Samuel D., Chase, Kenneth P.
• Primary Examiner(s): Schilling, Richard L.
• Application Number:
  US09/310,604
• Time in Patent Office: 426 Days
• Field of Search: 430/200, 430/201, 430/256, 430/257, 430/258, 430/235, 430/199
• US Class Current: 430/201
• CPC Class Codes: G03F 3/108 using a non-impact printing method, e.g. ink jet, using duplicating or marking methods covered by B41M5/00, e.g. by ablation or by thermographic means

Abstract

Dimensional inconsistencies between a proof and an image to be overlaid thereon is avoided by subjecting both the proof image and the overlay image to the same heat treatment, thereby ensuring that both images undergo the same degree of shrinkage.

Claims

1. A method of multistage digital proofing, the method comprising the steps of:

a. providing a transparent receiver sheet having first and second sides;

b. transferring, onto a first side of the receiver sheet, a first imagewise pattern comprising at least one color;

c. transferring, onto a second side of the receiver sheet, a second imagewise pattern comprising at least one color and dimensionally consistent with the first imagewise pattern; and

d. thermally transferring the first imagewise pattern onto a substrate without causing substantial damage to the second imagewise pattern on the receiver sheet, thereby rendering substantially uncolored the first side of the receiver sheet and facilitating removable registration of the second imagewise pattern with the transferred first imagewise pattern notwithstanding shrinkage of the receiver sheet or the substrate.

2. The method of claim 1 wherein the first imagewise pattern is transferred onto the receiver sheet according to steps comprising:

a. providing a donor sheet comprising a thermally transferable colored material;

b. contacting the donor sheet with the first surface of the receiver sheet; and

c. heating the donor sheet so as to cause transfer of the colored material in the first imagewise pattern.

3. The method of claim 2 further comprising repeating steps (a)-(c) for at least a second donor sheet of a different color in register with the first imagewise pattern on the receiver sheet.

4. The method of claim 1 wherein the step of thermally transferring comprises lamination.

5. The method of claim 1 wherein the second imagewise pattern is transferred onto the receiver sheet according to steps comprising:

a. providing a donor sheet comprising a thermally transferable colored material;

b. contacting the donor sheet with the second surface of the receiver sheet; and

c. heating the donor sheet so as to cause transfer of the colored material in the second imagewise pattern.

6. The method of claim 5 further comprising repeating steps (a)-(c) for at least a second donor sheet of a different color in register with the second imagewise pattern on the receiver sheet.

7. The method of claim 5 wherein the first imagewise pattern is transferred onto the substrate simultaneously with transfer of the second imagewise pattern onto the receiver sheet.

8. The method of claim 1 wherein the second imagewise pattern is transferred by lamination.