EP0203499B1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
A method of and apparatus for applying a mark to paper and a paper for use in such method
Assignee: Belmarque Systems SA
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Filing: 1986-05-20
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Granted: 1991-10-09
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Expires: 2006-05-20
Abstract
Abstract A method of applying a "pseudo watermark" to paper, comprises the steps of preparing a paper containing a suitable amount of a thermally sensitive material, the presence of which renders the translucency of the paper variable by temperature change, and subsequently applying heat to a part of the surface of the paper in a manner to cause a region of the paper to become semi-translucent. Apparatus suitable for applying heat to the paper is also disclosed.
Inventors
- 👤 Terence George Makin
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 19:20
CPC Classifications
B; B41; B41M; B41M3/00; B41M3/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
57 words
A method of applying a "pseudo watermark" to paper, which method comprises the steps of preparing a sheet or roll of paper containing a suitable amount of a thermally sensitive material, and subsequently applying heat to a part of the surface of the paper in a manner to cause a region of the paper to become semi-translucent.
Claim 2
Dependent Claim
18 words
A method according to claim 1, wherein the paper contains from 5 to 60% of thermally sensitive material.
Claim 3
Dependent Claim
17 words
A method according to claim 1 or 2, wherein the thermally sensitive material is a polyethylene polymer.
Claim 4
Dependent Claim
21 words
A method according to claim 1, 2 or 3, wherein the heat is applied directly to the surface of the paper.
Claim 5
Independent Claim
45 words
A method according to any one of claims 1 to 4, wherein a cut-out mask is placed over the paper and a heat source exposed to the paper so that only the un-masked areas of the paper are exposed to the effect of the heat.
Claim 6
Dependent Claim
22 words
A method according to claim 5, wherein a laser beam is used to apply heat to the un-masked portions of the paper.
Claim 7
Independent Claim
28 words
A method according to any one of claims 1 to 4, wherein a heated die or plate is used to apply heat to the surface of the paper.
Claim 8
Dependent Claim
30 words
A method according to claim 7, wherein the die or plate is applied to the surface of the paper at pressure in the range of from 0 to 80 kPa.
Claim 9
Independent Claim
29 words
A method according to any one of claims 1 to 8, wherein heat is applied to produce a paper surface temperature in the range 100 to 300 o C.
Claim 10
Dependent Claim
24 words
A method according to claim 9, wherein heat is applied to produce a paper surface temperature in the range 200 to 240 o C.
Claim 11
Dependent Claim
66 words
Apparatus comprising means for intermittently feeding paperstock, containing a thermally sensitive material, in a transport path between die members comprising a heated marking die or plate and a backing plate; and means for closing said die members upon the paperstock therebetween while said paperstock is stationary, for a timed period appropriate to effect marking of the paperstock by the application of heat to the surface thereof.
Claim 12
Dependent Claim
32 words
A paper for use in the method of any one of claims 1 to 10, or in the apparatus of claim 11, comprising from 5 to 60% of a thermally sensitive material.
Claim 13
Dependent Claim
15 words
A paper according to claim 12, wherein the thermally sensitive material is a polyethylene polymer.
References Cited (Backward Citations)
No citation records indexed.
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