US3900595A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making wiping cylinder of steel engraving printing press
Assignee: KBA Notasys SA
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Filing: 1973-10-24
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Granted: 1975-08-19
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Expires: 1993-10-24
Abstract
Abstract The wiping cylinder of a steel engraving printing press is coated with a plurality of thin plastic layers over a rubber base layer. When the wiping cylinder is to be cleaned with an organic solvent, the plastic coatings are of a thermoplastic synthetic resin that is soluble in water but not in organic solvents, for example polyvinyl alcohol that is partially saponified and contains acetyl groups. When the wiping cylinder is to be cleaned by an aqueous solution, the coatings are of a synthetic resin such as polyvinyl chloride that is not soluble in water. The thin plastic layers are applied successively by means of a doctor blade assuring smoothness, uniformity and exact thickness of the layers, and each layer is hardened before the next is applied.
Inventors
- 👤 Gualtiero Giori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:28
CPC Classifications
B; B41; B41N; B41N10/00; B41N10/005
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
284 words
A METHOD OF MAKING A WIPING CYLINDER OF A STEEL ENGRAVING PRESS WHICH COMPRISES PROVIDING A BASE CYLINDER, COVERING SAID BASE CYLINDER WITH A THIN LAYER OF RUBBER, PROVIDING A FIRST HOMOGENEOUS MIXTURE COMPOSED OF 100 PARTS BY WEIGHT OF POLYVINYL CHLORIDE, 30-50 PARTS BY WEIGHT OF DIOCTYLPHTHALATE, 30-50 PARTS BY WEIGHT OF TRICESYLPHOSPHATE AND 0.5 TO 3 PARTS BY WEIGHT OF A STABILIZER, PROVIDING A SECOND HOMOGENEOUS MIXTURE COMPOSED OF 100 PARTS BY WEIGHT OF POLYVINYL CHLORIDE, 25-40 PARTS BY WEIGHT OF DIOCTYLPHTHALATE, 15-30 PARTS BY WEIGHT OF TRICRESYLPHOSPHATE, 3-10 PARTS BY WEIGHT OF CACO3, 2-5 PARTS BY WEIGHT OF GRAPHITE AND 0.5-3 PARTS BY WEIGHT OF A STABILIZER, INITIALLY COATING SAID RUBBER COVERING WITH AN INITIAL SEAMLESS LAYER OF SAID FIRST HOMOGENEOUS MIXTURE HAVING A UNIFORM THICKNESS OF FROM 0.3 TO 1 MM, THEN COATING SAID LAYER WITH A PLURALITY OF INTERMEDIATE SEAMLESS LAYERS EACH COMPOSED OF ONE OF SAID FIRST AND SECOND HOMOGENEOUS MIXTURES AND EACH HAVING A UNIFORM THICKNESS OF FROM 0.3 TO 1 MM. UNTIL A COMPOSITE COATING INCLUDING SAID FIRST MENTIONED LAYER HAVING A UNIFORM TOTAL THICKNESS OF FROM 2 TO 3.5 MM. IS OBTAINED, AND FINALLY COATING SAID COMPOSITE COATING WITH A FINAL SEAMLESS LAYER OF SAID SECOND HOMOGENEOUS MIXTURE HAVING A UNIFORM THICKNESS OF FROM 0.3 TO 1 MM TO PROVIDE A SMOOTH CYLINDRICAL SURFACE PRECISELY CONCENTRIC WITH THE AXIS OF ROTATION OF SAID WIPING CYLINDER, EACH OF SAID LAYERS BEING HEAT HARDENED BEFORE AND OVERLAYING LAYER IS APPLIED, SAID LAYERS OF SAID FIRST MIXTURE BEING HARDENED IN SITU TO HARDNESS OF APPROXIMATELY SHORE A 60 TO 70 AND SAID FINAL LAYER BEING HARDENED IN SITU TO A HARDNESS OF APPROXIMATELY SHORE A 80 TO 95.
Claim 2
Independent Claim
284 words
A METHOD OF MAKING A WIPING CYLINDER OF A STEEL ENGRAVING PRESS WHICH COMPRISES PROVIDING A BASE CYLINDER, COVERING SAID BASE CYLINDER WITH A THIN LAYER OF RUBBER, PROVIDING A FIRST HOMOGENEOUS MIXTURE COMPOSED OF 100 PARTS BY WEIGHT OF POLYVINYL CHLORIDE, 30-50 PARTS BY WEIGHT OF DIOCTYLPHTHALATE, 30-50 PARTS BY WEIGHT OF TRICESYLPHOSPHATE AND 0.5 TO 3 PARTS BY WEIGHT OF A STABILIZER, PROVIDING A SECOND HOMOGENEOUS MIXTURE COMPOSED OF 100 PARTS BY WEIGHT OF POLYVINYL CHLORIDE, 25-40 PARTS BY WEIGHT OF DIOCTYLPHTHALATE, 15-30 PARTS BY WEIGHT OF TRICRESYLPHOSPHATE, 3-10 PARTS BY WEIGHT OF CACO3, 2-5 PARTS BY WEIGHT OF GRAPHITE AND 0.5-3 PARTS BY WEIGHT OF A STABILIZER, INITIALLY COATING SAID RUBBER COVERING WITH AN INITIAL SEAMLESS LAYER OF SAID FIRST HOMOGENEOUS MIXTURE HAVING A UNIFORM THICKNESS OF FROM 0.3 TO 1 MM, THEN COATING SAID LAYER WITH A PLURALITY OF INTERMEDIATE SEAMLESS LAYERS EACH COMPOSED OF ONE OF SAID FIRST AND SECOND HOMOGENEOUS MIXTURES AND EACH HAVING A UNIFORM THICKNESS OF FROM 0.3 TO 1 MM. UNTIL A COMPOSITE COATING INCLUDING SAID FIRST MENTIONED LAYER HAVING A UNIFORM TOTAL THICKNESS OF FROM 2 TO 3.5 MM. IS OBTAINED, AND FINALLY COATING SAID COMPOSITE COATING WITH A FINAL SEAMLESS LAYER OF SAID SECOND HOMOGENEOUS MIXTURE HAVING A UNIFORM THICKNESS OF FROM 0.3 TO 1 MM TO PROVIDE A SMOOTH CYLINDRICAL SURFACE PRECISELY CONCENTRIC WITH THE AXIS OF ROTATION OF SAID WIPING CYLINDER, EACH OF SAID LAYERS BEING HEAT HARDENED BEFORE AND OVERLAYING LAYER IS APPLIED, SAID LAYERS OF SAID FIRST MIXTURE BEING HARDENED IN SITU TO HARDNESS OF APPROXIMATELY SHORE A 60 TO 70 AND SAID FINAL LAYER BEING HARDENED IN SITU TO A HARDNESS OF APPROXIMATELY SHORE A 80 TO 95.
Claim 3
Dependent Claim
76 words
A method according to claim 1, wherein said initial and final coating steps each include heat treating the formed layer within a temperature range of from 200*C-250*C to effect hardening of the layer; and wherein intermediate coating steps each include heat treating the formed layer within a temperature range of from 150200*C to effect hardening of the layer, said hardening of said initial layer and each intermediate layer being effected before the next layer is applied.
Claim 4
Dependent Claim
73 words
A method according to claim 1, wherein said initial coating step comprises applying said layer of said first homogeneous mixture to said rubber covering at a temperature of from 20*C to 60*C, heat treating the applied layer for at least 5 minutes at a temperature of from 200*C to 250*C, and cooling the heat treated layer back down to a temperature of from 20*C to 60*C by immersing same in a water bath.
Claim 5
Dependent Claim
82 words
A method according to claim 1, including the steps of roughening the surface of said rubber covering before said initial coating step and thereafter applying over the roughened surface of said rubber covering a gauge strip saturated with said first homogeneous mixture, removing any excess of said first mixture to produce an evenly distribued layer having a thickness of 0.3 to 1 mm and then hardening said layer to form a thin even base film in which said gauge strip is embedded.
Claim 6
Dependent Claim
37 words
A method according to claim 2, including the step of cooling said initial layer and each said intermediate layer to a temperature of 20*C to 60*C after said heat treating and before the next layer is applied.
Claim 7
Dependent Claim
81 words
A method according to claim 1, wherein each of said layers is applied by rotating said cylinder with its axis horizontal and with its periphery precisely and uniformly spaced from a horizontal stright blade parallel to the axis of said cylinder and extending the full length of said cylinder and supplying said homogeneous mixture to an upper face of said blade throughout its length, said cylinder being rotated in a direction to cause its periphery to move downwardly past said blade.
Claim 8
Dependent Claim
59 words
A meThod according to claim 6, wherein the supply of said homogeneous mixture is discontinued after a sufficient quantity of said mixture has been supplied to form a layer on said cylinder, whereupon rotation of said cylinder is continued with said blade in place to remove any excess mixture and assure formation of a uniform layer of predetermined thickness.
Claim 9
Dependent Claim
36 words
A method according to claim 7, wherein rotation of said cylinder is continued after formation of each said layer while applying to said cylinder simultaneously throughout its length radiant heat to effect hardening of said layer.
Claim 10
Dependent Claim
48 words
A method according to claim 8, wherein said application of heat is discontinued after sufficient heat has been applied to harden said layer and rotation of said cylinder is continued while applying to said cylinder throughout its length a cooling fluid to reduce the temperature of said layer.
Claim 11
Dependent Claim
41 words
A method according to claim 6, in which said blade is first brought into engagement with said cylinder throughout the length of the cylinder and is then retracted a predetermined distance to apply a uniform layer of material of specified thickness.
Claim 12
Dependent Claim
25 words
A method according to claim 1, wherein the proportion of the constituents of said first and second homogeneous mixtures are by weight approximately as follows:
Claim 13
Dependent Claim
30 words
A method according to claim 1, wherein said layer of rubber is 0.3 to 4 mm thick and is cured to a hardness of approximately Shore A 40 to 90.
Claim 14
Dependent Claim
30 words
A method according to claim 1, wherein said rubber layer is composed of a mixture of nitrite and vinyl polymers having a hardness of approximately Shore A 70 to 75.
Claim 15
Dependent Claim
31 words
A method according to claim 1, wherein each layer of said first homogeneous mixture other than the initial layer is hardened to a hardness of approximately Shore A 60 to 70.
Claim 16
Independent Claim
202 words
A method of making a wiping cylinder of a steel engraving press which comprises providing a base cylinder covering said base cylinder with a layer of rubber, providing a first homogeneous filtered mixture composed of 150 g. of 30-88 polyvinyl alcohol, 150 g. of 50-88 polyvinyl alcohol and 900 g. of 70-88 polyvinyl alcohol wherein the first number of each polyvinyl alcohol designation indicates the relative length of the molecule chains and the second number indicates the degree of saponification, 300 g. of ethyl alcohol, 510 parts by weight of water and 30 parts by weight of glycerine; providing a second homogeneous mixture composed of 1.5l of said first homogeneous mixture, 50ml of CaCO3 and 10ml of tannic acid; coating said rubber covering with a plurality of layers each composed of said first homogeneous filtered mixture and each having a thickness of from 0.1 to 0.3 mm; and finally coating the last applied layer of said plurality of layers with a number of layers of said second homogeneous mixture to obtain a composite coating including said plurality of layers having a total thickness of from 1 to 2 mm, each of said layers being heat hardened before an overlying layer is applied.
Claim 17
Independent Claim
202 words
A method of making a wiping cylinder of a steel engraving press which comprises providing a base cylinder covering said base cylinder with a layer of rubber, providing a first homogeneous filtered mixture composed of 150 g. of 30-88 polyvinyl alcohol, 150 g. of 50-88 polyvinyl alcohol and 900 g. of 70-88 polyvinyl alcohol wherein the first number of each polyvinyl alcohol designation indicates the relative length of the molecule chains and the second number indicates the degree of saponification, 300 g. of ethyl alcohol, 510 parts by weight of water and 30 parts by weight of glycerine; providing a second homogeneous mixture composed of 1.5l of said first homogeneous mixture, 50ml of CaCO3 and 10ml of tannic acid; coating said rubber covering with a plurality of layers each composed of said first homogeneous filtered mixture and each having a thickness of from 0.1 to 0.3 mm; and finally coating the last applied layer of said plurality of layers with a number of layers of said second homogeneous mixture to obtain a composite coating including said plurality of layers having a total thickness of from 1 to 2 mm, each of said layers being heat hardened before an overlying layer is applied.
Claim 18
Independent Claim
36 words
A method of making a wiping cylinder of a steel engraving press which comprises providing a base cylinder, covering said base cylinder with a layer of rubber, providing a first homogeneous mixture having the following composition:
Claim 19
Independent Claim
36 words
A method of making a wiping cylinder of a steel engraving press which comprises providing a base cylinder, covering said base cylinder with a layer of rubber, providing a first homogeneous mixture having the following composition:
Claim 20
Dependent Claim
33 words
A method according to claim 16, including the further step of truing said cylinder after said final coating has been applied and said cylinder has set about 12 hours to stabilize said coatings.
Claim 21
Dependent Claim
44 words
A method according to claim 15, wherein each layer of the first homogeneous mixture is hardened to a hardness of Shore A 60 to 70 and each layer of the second homogeneous mixture is hardened to a hardness of Shore A 80 to 95.
Claim 22
Dependent Claim
21 words
A method according to claim 18, wherein each layer of the second homogeneous mixture has a thickness of about 0.15 mm.
Claim 23
Dependent Claim
22 words
A method according to claim 7, wherein each layer of said first homogeneous mixture has a thickness of 0.1 to 0.2 mm.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |