Patent US4187107A successfully refreshed from Google Patents.
US4187107A
Expired / Lapsed
US
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Making gravure plate with tint screen
Assignee: Toppan Inc
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Filing: 1978-08-23
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Granted: 1980-02-05
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Expires: 1998-08-23
Abstract
Abstract A plate making method for gravure printing which method is easy to carry out and excellent in the tone reproducibility of highlight portion. The method of the invention comprises the steps of: A. exposing a photosensitive material to light source through a gravure screen having desired number of transparent lines; B. exposing the photosensitive material to light through a tint screen and continuous tone positive; C. further exposing the photosensitive material to light through only the continuous tone positive; and D. treating the exposed photosensitive material with succeeding plate making steps such as transferring, developing and etching, in which the order of the above exposing steps A, B and C is not fixed.
Inventors
- 👤 Kokichi Homma, deceased
- 👤 Yoshio Kameyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:52
CPC Classifications
G; G03; G03F; G03F5/00; G03F5/20
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
229 words
A plate making method for gravure printing using a continuous tone positive, which method comprises the steps of: (a) placing a gravure screen having the desired number of transparent lines on a photosensitive material and exposing to light said photosensitive material through said gravure screen so that the portions of said photosensitive material under the transparent portions of said gravure screen may be cured, (b) placing a tint screen having transparent portions and a large number of opaque dots and also placed a continuous tone positive on said photosensitive material and again exposing said photosensitive material to light, the opaque dots of said tint screen being uniform in area, thereby said photosensitive material portions under the transparent portions of said tint screen being curved in response to the darkness of said continuous tone positive so that said curing is shallow in the shadow portions and deep in the highlight portions thereof, (c) placing said continuous tone positive on said photosensitive material and again exposing the latter to light, thereby said entire photosensitive material being cured in response to the darkness of said continuous tone positive so the said curing is shallow in the shadow portions and deep in the highlight portions thereof, the order of said steps (a), (b), and (c) being arbitrary, and (d) treating said photosensitive material subjected to said exposure steps to make a gravure plate.
Claim 2
Dependent Claim
229 words
A plate making method for gravure printing using a continuous tone positive, which method comprises the steps of: (a) placing a gravure screen having the desired number of transparent lines on a photosensitive material and exposing to light said photosensitive material through said gravure screen so that the portions of said photosensitive material under the transparent portions of said gravure screen may be cured, (b) placing a tint screen having transparent portions and a large number of opaque dots and also placed a continuous tone positive on said photosensitive material and again exposing said photosensitive material to light, the opaque dots of said tint screen being uniform in area, thereby said photosensitive material portions under the transparent portions of said tint screen being curved in response to the darkness of said continuous tone positive so that said curing is shallow in the shadow portions and deep in the highlight portions thereof, (c) placing said continuous tone positive on said photosensitive material and again exposing the latter to light, thereby said entire photosensitive material being cured in response to the darkness of said continuous tone positive so the said curing is shallow in the shadow portions and deep in the highlight portions thereof, the order of said steps (a), (b), and (c) being arbitrary, and (d) treating said photosensitive material subjected to said exposure steps to make a gravure plate.
Claim 3
Dependent Claim
36 words
A plate making method for gravure printing as claimed in claim 1, wherein the area of each screen dot of said tint screen is smaller than the area of each screen dot of said gravure screen.
Claim 4
Dependent Claim
56 words
A plate making method for gravure printing as claimed in claim 1, wherein the area of each screen dot or said tint screen is smaller than the sum of the area of each screen dot of said gravure screen and the area of the transparent lines on two sides of said dot of said gravure screen.
Claim 5
Dependent Claim
56 words
A plate-making method for gravure printing as claimed in claim 1, wherein the area of each screen dot of said tint screen is not smaller than the sum of the area of each screen dot of said gravure screen and the area of the transparent lines on two sides of said dot of said gravure screen.
Claim 6
Dependent Claim
44 words
A plate making method for gravure printing as claimed in claim 1, wherein said tint screen used in said exposure step B is applied to a portion of said photosensitive material, which portion corresponds to characters and/or patterns of the original to be printed.
Claim 7
Dependent Claim
57 words
A plate making method for gravure printing as claimed in claim 1, wherein said photosensitive material is a carbon resist and said succeeding plate making steps comprises the steps of: transferring exposed carbon resist on the surface of a gravure cylinder; developing said carbon resist; and etching the surface of said gravure cylinder through said carbon resist.
Claim 8
Dependent Claim
68 words
A plate making method for gravure printing as claimed in claim 1, wherein said photosensitive material is a gravure resist film and said succeeding plate making steps comprises the steps of: developing exposed gravure resist film with developing agents; transferring said developed gravure resist film on a gravure cylinder; again developing said gravure resist film with hot water; and etching said gravure cylinder through said gravure resist film.
Claim 9
Dependent Claim
45 words
A plate making method for gravure printing as claimed in claim 1, wherein said photosensitive material is a photosensitive resin layer formed on a gravure cylinder and said succeeding plate making steps comprise the step of developing said photosensitive resin layer on said gravure cylinder.
Claim 10
Dependent Claim
53 words
A plate making method for gravure printing as claimed in claim 1, wherein a continuous tone negative or a combination of a halftone negative and a diffusion sheet each having the same sizes as those of said continuous tone positive, is put in layers with said gravure screen in said exposure step A.
Claim 11
Dependent Claim
41 words
A plate making method for gravure printing as claimed in claim 1, wherein said exposure step A is omitted and a continuous tone positive having transparent crosslines is used in place of said continuous tone positive in said exposure step B.
Claim 12
Dependent Claim
32 words
A plate making method for gravure printing as claimed in claim 10, wherein said continuous tone positive having transparent crosslines has said crosslines only in the regions of middle tone to shadow.
Claim 13
Dependent Claim
130 words
A plate making method for gravure printing as in claim 1, wherein the resultant plate has a first group of ink cells in response to the dots of said tint screen in the highlight portions of said continuous tone positive, which ink cells have sufficient depth to retain ink after being subjected to a doctor blade, and said plate having a second group of ink cells in the middle tone to the shadow portions of said continuous tone positive, said second group of ink cells each having a deep portion and a shallow portion, said deep portions being formed in response to the dots of said tint screen, said first and second groups of ink cells having a variety of depths proportional to the darkness of said continuous tone positive.
Claim 14
Dependent Claim
39 words
A plate making method for gravure printing as in claim 1, wherein the resultant plate has ink cells including a deep portion and a shallow portion, said deep portions being formed between the transparent lines of said gravure screen.
Claim 15
Dependent Claim
52 words
A plate making method for gravure printing as claimed in claim 1, wherein said tint screen includes a plurality of opaque half-tone dots and surrounding transparent portions, said half-tone dots being uniformly distributed over said tint screen, the borderline between each of said half-tone dots and said surrounding transparent portions being distinct.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-02-04 | 1983-08-06 | 1984-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-04 | 1987-08-06 | 1988-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-04 | 1991-08-06 | 1992-02-05 | $7700.00 | Window Closed / Lapsed |