US3818832A - Method of forming an engraved plate - Google Patents

Method of forming an engraved plate Download PDF

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Publication number
US3818832A
US3818832A US27728172A US3818832A US 3818832 A US3818832 A US 3818832A US 27728172 A US27728172 A US 27728172A US 3818832 A US3818832 A US 3818832A
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Grant
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Prior art keywords
layer
engraving
rubber
face
printing
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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Inventor
T Coale
D Tompkins
S Gunn
F Merrigan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Stone Container Corp
REGIS PAPER CO
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REGIS PAPER CO
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41CPROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00Forme preparation
    • B41C1/02Engraving; Heads therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41NPRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM In this subclass the COPES System is used
    • B41N1/00Printing plates or foils; Materials therefor
    • B41N1/12Printing plates or foils; Materials therefor non-metallic other than stone, e.g. printing plates or foils comprising inorganic materials in an organic matrix

Abstract

An engraving blanket which comprises an engraveable layer of live resilient rubber material vulcanized at one face to a face of a base layer of nonhard, nonresilient rubber material. Talcum powder is evenly dispersed between the vulcanized faces of the two layers to control the degree of adhesion between the two. This permits selected portions of the engraveable layer to be cut out and stripped from the base layer to produce a printing design and yet provides sufficient adhesion to keep the layers together during use of the blanket. The disclosure also relates to the method of making the engraving blanket.

Description

United States Patent 1191 8/1926 Stedman 156/248 X 11] 3,818,832 Coale et al. 14 June 25, 1974 [5 METHOD OF FORMING AN ENGRAVED 1,597,432 8/1926 Conant 1. 156/289 x PLATE 3,002,231 10/1961 Walker et al. 156/289 X 1 3,180,260 4/1965 Joseph 101/401.1 Inventors: as -v oa Pensacola; Sldney 3,276,947 10/1966 Waterman 101 /415.1 x

W. Gunn, Cantonment; Frank Merrigan; Donald Tompkins, FOREIGN PATENTS OR APPLICATIONS both of Pensacola, all of Fla. 100,912 5/1937 Australia 101/395 [73] Assignee: St. Regis Paper Company, New

York, NY. Primary Examiner-Clyde l. Coughenour Attorne A em, or Firm-Woodlin ,Krost, Gran er [22 Filed; Aug. 2, 1972 & Rusty g g g [21] Appl. No: 277,281

[57] ABSTRACT U-S. An engraving blanket comprises an engraveable 156/289 layer of live resilient rubber material vulcanized at one [51] f CL 1/02 1332b 31/12, B3219 31/18 face to a face of a base layer of nonhard, nonresilient 158] Field of Search 156/248 289; 101/395 rubber material. Talcum powder is evenly dispersed 101/401, 401-] between the vulcanized faces of the two layers to control the degree of adhesion between the two. This per- [56] References Cited mits selected portions of the engraveable layer to be UNlTED STATES PATENTS cut out and stripped from the base layer to produce a 1,093,310 4/1914 Carkhuff 101/368 x Printing design and y Provides Sufficient adhesion to 1,195,311 8/1916 White 156/239 x keep the layers together during use of the blanket. 1,367,180 2/1921 Darrow.... 156/289 X The disclosure also relates to the method of making 1,534,527 4/1925 Joseph |O1/401.1 X the engraving blanket, 1 1,589,665 6/1926 Schmutz 101/395 1,595,581 3 Claims, 3 Drawing lFigures PAlENfEnJunzsmm 3818.832 sum; are- I 1 METHOD OF FORMING AN ENGRAVED PLATE The present invention relatesin general to what are commonly referred to as engraving blankets where a printing design is produced at the printing face of the blanket to perform a printing function.

Many prior art blankets include a cover sheet of a rubber composition which has a base or backing sheet of a canvas or cloth construction. In these constructions, problems arise in that the edges of the backing sheet fray and raise, causing problems during the printing operation. Frayed or raised edges cause undesirable lines or smudges in the printing operation.

Other prior art designs have involved the use of two or more layers of rubber-like material; however, no provision has been made to provide for the easy removal or stripping of selected portions of the printing layer from the base layer to form a printing design.

In'the design of the engraving blanket of the present invention the problems involved with the canvas or cloth backing sheet have beenobviated in that both the top engraveable layer and the base layer are constructed of a rubber composition without the use of cloth or canvas. In the present design provision is made for the convenient removal or stripping of selected portions of the engraveable layer to produce a desired printing design by placing a small but effective amount of an extremely fine grit talcum powder between the engraveable layer and the base layer before vulcanizing the two layers together in a press.

It is, therefore, an object of the present invention to provide an engraving blanket which obviates the abovementioned difficulties of the prior art and which is economical to produce, reliable in operation and has a substantial longevity.

Other objects and a fuller understanding of this invention may be had by referring to the following description and claims, taken in conjunction with the accompanying drawings, in which:

FIG. 1 is an isometric view of a step in making the engraving blanket of the present invention;

FIG. 2 is a fragmentary elevational view showing an other step in making the engraving blanket; and

FIG. 3 is an isometric view of the completed engraving blanket.

FIGS. 1 through 3 best illustrate the method of making and the finished construction of the engraving blanket of the present invention and FIG. 1 illustrates the placing of an engraving layer 22 of a rubber composition into contact with a plate of magnesium engraving metal 24. A printing face 26 of the engraving layer 22 is placed in contact with place 24 and this is to provide a very fine finish for the face 26 because of the nature of the magnesium from which the plate is formed. The engraving layer is also provided with what will be described as a stripping face 27.

After the engraving layer has been so placed, the

stripping face 27 thereof is provided with a fine grit talcum powder 28 evenly dispersed over the surface thereof. The talcum powder is dispersed in an amount on the order of one-fourth gram for each square yard of stripping face 27 surface area.

A base layer 30 of a rubber composition having a stripping face 31 is next brought into contact with the engraving layer 22 with the faces 27 and 31 together and with the talcum powder 28 sandwiched therebetween. If desired, the talcum powder may be applied to face 31 of layer 30 before face 31 is brought into contact with face 27.

The so assembled plate 24, layer 22 and layer 30 are next placed in a vulcanizing press (FIG. 2) which includes upper and lower platens 35 and 36. The unvulcanized rubber composition layers 22 and 30 are vulcanized together in the press at a temperature of on the order of 130C for about 15 minutes.

The assembly is then removed from the vulcanizing press and any flash of rubber composition is removed from around the edges of plate 24. The vulcanized layers 22 and 30 are removed from plate 24 and if desired the exposed surface of the base layer 30 may be ground to produce the overall desired thickness of the engraving blanket 20 which is then ready for engraving. As an example, the total thickness of the engraving blanket 20 may be on the order of 0.1 10 to 0.112 inch.

FIG. 3 illustrates the engraving process and here it will be seen that the letters S and R are produced. This is accomplished by utilizing ajsharp instrument such as an engraving knife and cutting through the engraving layer 22from the printing face 26 down to the contiguous stripping faces 27 and 31. The cut portions of engraving layer 22 are then stripped from face 31 of the base layer 30 to define the voids indicated by reference numeral 34 and the letters S and R are formed of the portion of the engraving layer which remains. The engraving blanket is now ready to perform its printing function by the application of a printing fluid to the printing face and impressing the same onto an object which is to beprinted.

The rubber composition of the engraveable layer is an engraving gum stock of a live and resilient nature which is capable of a life of up to one million printing impressions. It may be a natural rubber composition having a Shore Durometer (Shore A) Hardness of on the order of 50-55 after vulcanization. It may also be a vulcanizable polyblend made by mixing a polyvinyl chloride with a rubbery nitrile copolymer rubber with the vulcanizate exhibiting a Shore Durometer (Shore A) Hardness of on the order of 50-55.

The rubber composition of the base layer is best described as beinga nonresilient (i.e., dead), nonhard material which is compatible for vulcanization with the material of the engraveable layer. It may be of a natural or synthetic composition but is preferably a vulcanizable nitrile rubber which exhibits a Shore Durometer (Shore A) Hardness of on the order of 50-55 after vulcanization. The nitrile rubber used is a butadieneacrylonitrile copolymer with the butadiene content being more than 50 percent of the total weight. The nature of the base layer material is such that it is resistant to creeping or stretching as the engraving blanket is used.

The resiliency of. the engraveable layer is relatively high compared to the resiliency of the base layer. In tests on standard rubber rebounding test machinery it has been found that the engraveable layer has a rebound value of on the order of 177 and the base layer in one instance had a rebound value of about and in another instance a value of about 69. The figures represent comparative values with the higher the number representing the greatest rebound. It will be seen that the engraveable layer has at least two times the resiliency as the base layer.

The talcum powder 28 used is for the purpose of controlling the degree of vulcanization between the en- 3 graving layer 22 and the base layer 30. This can be explained in terms other than the amount of talcum used and the terms are the amount of force necessary to pull the two layers apart. The test to determine the force is made on what is known in the art as a Scott Model X-3 Test Machine. A sample of the engraving blanket of a size 1 inch X 10.25 inches is cut from the roll in the filling direction. The two layers'are stripped away from each other a distance about 1 inch to 1 /2 inches. The sample is placed in the Scott Model X-3 and run at a speed of 2.5 inches/minute. A reading in pounds is recorded and the preferred adhesion between the layers in this invention gives a reading between 6 and 8 pounds.

It will thus be seen that the construction of the present invention provides for the convenient preparation of the printing face of the engraving layer and does away with the problems of blankets which utilize a canvas or cloth backing. The blanket of this invention is economical to produce and has a long commercial life.

Although this invention has been described in its preferred form with a certain degree of particularity, it is understood that the present disclosure of the preferred form has been made only by way of example and that numerous changes in the details of construction and the combination and arrangement of parts may be resorted to without departing from the spirit and the scope of the invention as hereinafter claimed.

What is claimed is:

- having a stripping face, uniformly adding a small but effective amount of talcum powder on the order of onefourth gram for each square yard to at least one of said stripping faces, placing the stripping face of said first layer into contiguous contact with the stripping face of said second layer, placing the first and second layers in a vulcanizing press and vulcanizing the two layers together, cutting through the printing face of said first layer down to said stripping faces in a given pattern and stripping the pattern of said first layer from said second layer to leave indicia for printing at said printing face of said first layer.

2. The method as claimed in claim 1, wherein said rubber composition of said engraveable layer is a vulcanizable natural rubber or a vulcanizable polyblend of polyvinyl chloride and a nitrile rubber and said rubber composition of said base layer is a vulcanizable nitrile rubber.

3. The method as claimed in claim 2, wherein the Shore Durometer (Shore A) Hardness of the engraveable layer and the base layer are on the order of 50 55.

Claims (3)

1. The method of making an engraving blanket including the steps of providing a first layer of relatively live relisient material of a rubber composition and having a printing face and a stripping face and providing a second layer of relatively nonhard, nonresilient material compatible for vulcanization with the material of the first layer and being of a rubber composition and having a stripping face, uniformly adding a small but effective amount of talcum powder on the order of one-fourth gram for each square yard to at least one of said stripping faces, placing the stripping face of said first layer into contiguous contact with the stripping face of said second layer, placing the first and second layers in a vulcanizing press and vulcanizing the two layers together, cutting through the printing face of said first layer down to said stripping faces in a given pattern and stripping the pattern of said first layer from said second layer to leave indicia for printing at said printing face of said first layer.
2. The method as claimed in claim 1, wherein said rubber composition of said engraveable layer is a vulcanizable natural rubber or a vulcanizable polyblend of polyvinyl chloride and a nitrile rubber and said rubber composition of said base layer is a vulcanizable nitrile rubber.
3. The method as claimed in claim 2, wherein the Shore Durometer (Shore A) Hardness of the engraveable layer and the base layer are on the order of 50 - 55.
US3818832A 1972-08-02 1972-08-02 Method of forming an engraved plate Expired - Lifetime US3818832A (en)

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US3818832A US3818832A (en) 1972-08-02 1972-08-02 Method of forming an engraved plate

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Application Number Priority Date Filing Date Title
US3818832A US3818832A (en) 1972-08-02 1972-08-02 Method of forming an engraved plate
CA 176474 CA1012837A (en) 1972-08-02 1973-07-16 Rubber printing master
US05383556 US3991673A (en) 1972-08-02 1973-07-30 Nonfabric engraving blanket

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US05383556 Division US3991673A (en) 1972-08-02 1973-07-30 Nonfabric engraving blanket

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3947309A (en) * 1973-04-18 1976-03-30 Trus Joist Corporation Pitched wooden truss with integral ridge connector
WO2013041319A1 (en) * 2011-09-19 2013-03-28 Contitech Elastomer-Beschichtungen Gmbh Multi-layered structure form for use as printing blanket or printing plate for relief printing, in particular flexo printing

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1093310A (en) * 1908-09-04 1914-04-14 Stacy G Carkhuff Vehicle-tire.
US1195311A (en) * 1916-08-22 Johw f
US1367180A (en) * 1918-03-06 1921-02-01 Goodyear Tire & Rubber Method of manufacturing pneumatic-tire treads
US1534527A (en) * 1921-04-16 1925-04-21 Tucker Rubber Corp Rubber fabrication
US1589665A (en) * 1924-03-05 1926-06-22 Schmutz Mfg Company Article of manufacture
US1595581A (en) * 1925-01-21 1926-08-10 James H Stedman Rubber interior decorative unit
US1597432A (en) * 1920-09-10 1926-08-24 Leon B Conant Process of uniting two rubber surfaces
US3002231A (en) * 1958-06-06 1961-10-03 Phillips Petroleum Co Molding process
US3180260A (en) * 1963-05-07 1965-04-27 Foamcraft Inc Method of assembling resin foam printing member
US3276947A (en) * 1961-04-17 1966-10-04 Us Rubber Co Lithographic printer's blanket and method of making same

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1195311A (en) * 1916-08-22 Johw f
US1093310A (en) * 1908-09-04 1914-04-14 Stacy G Carkhuff Vehicle-tire.
US1367180A (en) * 1918-03-06 1921-02-01 Goodyear Tire & Rubber Method of manufacturing pneumatic-tire treads
US1597432A (en) * 1920-09-10 1926-08-24 Leon B Conant Process of uniting two rubber surfaces
US1534527A (en) * 1921-04-16 1925-04-21 Tucker Rubber Corp Rubber fabrication
US1589665A (en) * 1924-03-05 1926-06-22 Schmutz Mfg Company Article of manufacture
US1595581A (en) * 1925-01-21 1926-08-10 James H Stedman Rubber interior decorative unit
US3002231A (en) * 1958-06-06 1961-10-03 Phillips Petroleum Co Molding process
US3276947A (en) * 1961-04-17 1966-10-04 Us Rubber Co Lithographic printer's blanket and method of making same
US3180260A (en) * 1963-05-07 1965-04-27 Foamcraft Inc Method of assembling resin foam printing member

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3947309A (en) * 1973-04-18 1976-03-30 Trus Joist Corporation Pitched wooden truss with integral ridge connector
WO2013041319A1 (en) * 2011-09-19 2013-03-28 Contitech Elastomer-Beschichtungen Gmbh Multi-layered structure form for use as printing blanket or printing plate for relief printing, in particular flexo printing

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Publication number Publication date Type
CA1012837A (en) 1977-06-28 grant
CA1012837A1 (en) grant

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Legal Events

Date Code Title Description
AS Assignment

Owner name: CHAMPION INTERNATIONAL CORPORATION

Free format text: MERGER;ASSIGNOR:ST. REGIS CORPORATION 1/28/85;REEL/FRAME:004679/0807

Effective date: 19850128

Owner name: STONE BROWN PAPER, INC., A CORP. OF DE.

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CHAMPION INTERNATIONAL CORPORATION, A CORP.OF N.Y.;REEL/FRAME:004680/0410

Effective date: 19860707

AS Assignment

Owner name: STONE CONTAINER CORPORATION

Free format text: MERGER;ASSIGNOR:STONE BROWN PAPERS, INC., A DE CORP., (MERGED INTO);REEL/FRAME:004893/0167

Effective date: 19861222

Owner name: STONE CONTAINER CORPORATION

Free format text: MERGER;ASSIGNORS:STONE CONTAINER CORPORATION, A CORP. OF IL, (MERGED INTO);S.C.C. MERGER CORPORATION, A CORP. OF DE, (CHANGED TO);REEL/FRAME:004893/0153

Effective date: 19870515