A plate roll and an adhesive sheet therefor.

BACKGROUND OF THE INVENTION

1. Field of the invention

0001The present invention relates to a novel plate roll attached with a printing plate made of resin by means of adhesive and a novel adhesive sheet utilized for attaching the printing plate to the base plate roll.

2. Prior art

0002A printing plate leaf made of resin is attached to a base plate roll to form a plate roll by means of a double faced adhesive sheet and continuous printing is made by rotating the plate roll.

0003Adhesives generally utilized for attaching the printing plate leaf to the base plate roll have strong adhesive ability and the printing plate leaf is not easily detached from the base plate roll after the printing is finished. Occasionally, the printing plate leaf made of resin is torn up during the operation of detaching. A part of the adhesive and the adhesive sheet usually remains on the surface of the base plate roll or the printing plate and removal of the remaining things takes time.

SUMMARY OF THE INVENTION

0004The present invention accordingly has an object to provide a plate roll in which printing plate is firmly attached during the printing operation, the printing plate is easily detached from the base plate roll after the printing operation is finished and remaining adhesive is easily removed. Another object of the invention is to provide an adhesive sheet utilized for the plate roll.

0005Thus, the plate roll attached with a printing plate made of resin by means of an adhesive of the present invention is characterized in that a photo curable adhesive which loses adhesive ability by curing by irradiation of electromagnetic wave or electron beam is used as the adhesive.

0006The plate roll attached with a printing plate made of resin by means of an adhesive of the invention is also characterized in that a water swelling adhesive which loses adhesive ability by swelling by water is used as the adhesive.

0007The adhesive sheet utilized for attaching a printing plate made of resin to a base plate roll of the invention is characterized in that the adhesive sheet comprises a removable sheet and a photo curable adhesive which loses adhesive ability by curing by irradiation of electromagnetic wave or electron beam and is coated on one face of the removable sheet.

0008The adhesive sheet utilized for attaching a printing plate made of resin to a base plate roll of the invention is also characterized in that the adhesive sheet comprises a supporting sheet, a removable sheet and adhesive layers coated on both faces of the supporting sheet, that the adhesive layer coated at least on one face of the supporting sheet comprises a photo curable adhesive which loses adhesive ability by curing by irradiation of electromagnetic wave or electron beam and that the removable sheet is attached at least on one face of the adhesive sheet.

0009The adhesive sheet utilized for attaching a printing plate made of resin to a base plate roll of the invention is also characterized in that the adhesive sheet comprises a removable sheet and a water swelling adhesive which loses adhesive ability by swelling by water and is coated on one face of the removable sheet.

0010The adhesive sheet utilized for attaching a printing plate made of resin to a base plate roll of the invention is also characterized in that the adhesive sheet comprises a supporting sheet, a removable sheet and adhesive layers coated on both faces of the supporting sheet, that the adhesive layer coated at least on one face of the supporting sheet comprises a water swelling adhesive which loses adhesive ability by swelling by water and that the removable sheet is attached at least on one face of the adhesive sheet.

0011The adhesive sheet utilized for attaching a printing plate made of resin to a base plate roll of the invention is also characterized in that the adhesive sheet comprises a supporting sheet, a removable sheet and adhesive layers coated on both faces of the supporting sheet, that the adhesive layer coated on one face of the supporting sheet comprises a photo curable adhesive which loses adhesive ability by curing by irradiation of electromagnetic wave or electron beam, that the adhesive layer coated on the other face of the supporting sheet comprises a water swelling adhesive which loses adhesive ability by swelling by water and that the removable sheet is attached at least on one face of the adhesive sheet.

0012Other and further objects, features and advantages of the invention will appear more fully from the following description.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

0013It was considered by the present inventors that the antinomic problem that a printing plate is firmly attached to base plate roll during the printing operation and easily detached after the printing operation is finished can be solved only by changing the adhesive ability of the adhesive utilized between the time of attachment and the time of detachment. For the purpose of changing the adhesive ability of the adhesive utilized, a mechanism of decreasing the adhesive ability by curing the adhesive by the action of electromagnetic wave and another mechanism of decreasing the adhesive ability by swelling the adhesive by water were considered. These considerations led to the completion of the present invention.

0014The present invention as a whole comprises the following seven inventions: Invention 1: A plate roll attached with a printing plate made of resin by means of an adhesive which is characterized in that a photo curable adhesive which loses adhesive ability by curing by irradiation of electromagnetic wave or electron beam is used as the adhesive. Invention 2: A plate roll attached with a printing plate made of resin by means of an adhesive which is characterized in that a water swelling adhesive which loses adhesive ability by swelling by water is used as the adhesive. Invention 3: An adhesive sheet utilized for attaching a printing plate made of resin to a base plate roll which is characterized in that the adhesive sheet comprises a removable sheet and a photo curable adhesive which loses adhesive ability by curing by irradiation of electromagnetic wave or electron beam and is coated on one face of the removable sheet. Invention 4: An adhesive sheet utilized for attaching a printing plate made of resin to a base plate roll which is characterized in that the adhesive sheet comprises a supporting sheet, a removable sheet and adhesive layers coated on both faces of the supporting sheet, that the adhesive layer coated at least on one face of the supporting sheet comprises a photo curable adhesive which loses adhesive ability by curing by irradiation of electromagnetic wave or electron beam and that the removable sheet is attached at least on one face of the adhesive sheet. Invention 5: An adhesive sheet utilized for attaching a printing plate made of resin to a base plate roll which is characterized in that the adhesive sheet comprises a removable sheet and a water swelling adhesive which loses adhesive ability by swelling by water and is coated on one face of the removable sheet. Invention 6: An adhesive sheet utilized for attaching a printing plate made of resin to a base plate roll which is characterized in that the adhesive sheet comprises a supporting sheet, a removable sheet and adhesive layers coated on both faces of the supporting sheet, that the adhesive layer coated at least on one face of the supporting sheet comprises a water swelling adhesive which loses adhesive ability by swelling by water and that the removable sheet is attached at least on one face of the adhesive sheet. Invention 7: An adhesive sheet utilized for attaching a printing plate made of resin to a base plate roll which is characterized in that the adhesive sheet comprises a supporting sheet, a removable sheet and adhesive layers coated on both faces of the supporting sheet, that the adhesive layer coated on one face of the supporting sheet comprises a photo curable adhesive which loses adhesive ability by curing by irradiation of electromagnetic wave or electron beam, that the adhesive layer coated on the other face of the supporting sheet comprises a water swelling adhesive which loses adhesive ability by swelling by water and that the removable sheet is attached at least on one face of the adhesive sheet.

0015The kind of the printing plate made of resin and the base plate roll utilized in the invention is not particularly limited but any kind may be utilized.

0016The adhesive utilized in the invention 1 is not particularly limited so long as the adhesive loses its adhesive ability by irradiation of electromagnetic wave, such as ultraviolet light, visible light, γ-ray, X-ray infrared light and the like, or electron beam. When electromagnetic wave having weaker penetrating power through substances, such as ultraviolet light, visible light and infrared light, is utilized, the printing plate made of resin is desirably more transparent.

0017The loss of adhesive ability in the invention means a remarkable decrease of adhesive strength. It is the condition that the adhesive strength is so lower than the original strength that the printing plate can be detached easily by hands.

0018Examples of the photo curable adhesive of the invention are: (1) an adhesive comprising polymer having two or more photo reactive unsaturated bonds as the main component of the adhesive and (2) an adhesive which is prepared by compounding a photo sensitive monomer and like other reactive low molecular weight compounds into a conventional adhesive.

0019Examples of the photo curable adhesive (1) are: a polymer prepared by reacting glycidyl (meth)acrylate with acid groups in copolymer of acrylic ester or methacrylic ester and a small amount of acrylic acid or methacrylic acid; and a polymer prepared by reacting half-urethane with a mixture of β-hydroxyethyl (meth)acrylate having hydroxylgroup in the molecule with copolymer of acrylic ester or methacrylic ester and a small amount of acrylic acid or methacrylic acid. The half-urethane is prepared by the reaction of polyisocyanate with a monomer containing hydroxyl group. Photo reactive groups are introduced into the polymer by these reactions.

0020Examples of the photo curable adhesive (2) are: a compound prepared by mixing a photo sensitive monomer with conventional rubber or acrylic adhesive in the amount from 1 to 50 weight %.

0021Examples of the photo sensitive monomer are: (meth)arylic esters having two or more double bonds in the molecule, such as 1,4-butylene glycol diacrylate, 1,6-hexane glycol diacrylate, neopentyl glycol diacrylate, (poly)ethylene glycol diacrylate, trimethylolpropane tri(meth)acrylate, tetramethylolmethane tetracrylate and the like.

0022It is desirable that a photo sensitizer is added to the photo curable adhesive to enhance the reaction rate of curing. Examples of such photo sensitizer are: diacetyl, benzil, benzophenone, benzoin, bromoacetophenone, chloroacetone, benzoquinone, anthraquinone, 2-ethylanthraquinone, benzoin isopropyl ether, benzoin ethyl ether and the like other organic carbonyl compounds. The photo sensitizer is generally utilized in the amount from 0.1 to 10 weight % of the adhesive.

0023After printing is finished, the plate roll of the invention 1 is irradiated by electromagnetic wave or electron beam from the surface of the printing plate made of resin attached on the base plate roll. Because the adhesive between the printing plate and the base plate roll is cured by the irradiation, the adhesive ability of the adhesive is lost and the printing plate made of resin is easily detached from the base plate roll.

0024The source of the irradiation is not particularly limited so long as the irradiation cures the adhesive and can be appropriately selected according to the adhesive utilized. Ultraviolet light is preferable because of efficiency of the irrdiation time and simplicity of apparatus.

0025The kind of the water swelling adhesive of the invention 2 is not particularly limited so long as the adhesive loses adhesive ability by swelling with water.

0026An example of the water swelling adhesive is an adhesive described in Japanese Patent Publication Showa 49-23294 which is described in the following.

0027The adhesive comprises (A) one or more than one kinds of nonionic surface active agent which comprises ethylene oxide group as the hydrophillic group and (B) one or more than one kinds of copolymer composed of 40 to 99 mole % of one or more than one kinds of constituent unit having the formula (I) and 60 to 1 mole % of one or more than one kinds of constituent unit having the formula (II) and, optionally according to the needs, carboxyl groups comprised in the component (B) are crosslinked by a cross linking agent reacting with carboxyl group, such as zinc acetate and magnesium chloride; <chemistry id="chem0001" num="0001"><img file="EP0452808A2_D0001.tif" /></chemistry> wherein R₁ is hydrogen, chlorine or lower alkyl group, R₂ is hydrogen, chlorine, lower alkyl group, -OCOR₃, -OR₃, -COOR₃, phenyl, tolyl, -CN, -CONH₂, -CONHCH₂OH, -CH₂OH, -C₂H₄OH, -OH or pyridyl and R₃ is alkyl group of 1 to 8 carbon atoms; <chemistry id="chem0002" num="0002"><img file="EP0452808A2_D0002.tif" /></chemistry> wherein X, Y and Z may be the same kind or different kinds selected from hydrogen, chlorine, lower alkyl group, -COOR₄, -COOH, -CH₂COOH or -CH₂COOR₄ and R₄ is alkyl group of 1 to 4 carbon atoms. Alkaline compounds, such as potassium hydroxide, may be added when the adhesive is crosslinked by the crosslinking agent

0028Examples of the nonionic surface active agent which comprises ethylene oxide group as the hydrophillic group of the component (A) are: <ul id="ul0001" list-style="none"><li>(1) OH(C₂H₄O)_a(C₃H₆O)_b(C₂H₄O)_cH, wherein a, b and c are integers from 20 to 80;</li><li>(2) RA(C₂H₄O)_dH, wherein R is alkyl group of 6 to 18 carbon atoms, alkylphenyl group having alkyl group of 4 to 20 carbon atoms or a group having the formula (III) <chemistry id="chem0003" num="0003"><img file="EP0452808A2_D0003.tif" /></chemistry> wherein A is oxygen, sulfur or -COO-, -CONH-, -CON(C₂H₄O)_dH-, -PO₄H- or -PO₄(C₂H₄O)_dH- and d is an integer from 2 to 80; and <chemistry id="chem0004" num="0004"><img file="EP0452808A2_D0004.tif" /></chemistry> wherein R is alkyl group of 6 to 18 carbon atoms and x, y and z are integers of 2 to 40.</li></ul>

0029Preferable examples of the nonionic surface active agent which comprises ethylene oxide group as the hydrophillic group of the component (A) are: polyethylene glycol nonylphenyl ether, polyethylene glycol sorbitane monooleyl ester, polyethylene glycol lauryl ether, block copolymer of polyethylene glycol and polypropylene glycol, polyethylene glycol lauryl phenyl ether, polyethylene glycol t-butyl phenyl ether and the like.

0030The constituent unit having the formula (I) of the component (B) is introduced by using a monomer, such as vinyl esters like vinyl acetate, methacrylic esters like ethyl acrylate, ethylene, styrene, methyl vinyl ether, vinyl chloride and acrylonitrile. The constituent unit having the formula (II) of the component (B) is introduced by using a monomer having carboxyl group, such as acrylic acid, methacrylic acid, crotonic acid, itaconic acid, maleic acid, fumaric acid, aconotic acid, monoalkyl maleic acid, monoalkyl fumaric acid, monoalkyl itaconic acid and the like.

0031It is required that the component (A) and the component (B) are compatible and the adhesive prepared swells with water and, therefore, that the ratio of the component (A) and the component (B) is within a definite range as described in the cited reference.

0032Epoxy compounds of glycidyl derivative may be optionally utilized with the component (A) and the component (B).

0033Another example of the water swelling adhesive is an adhesive described in Laid Open Japanese Patent Publication Showa 59-157162 which is described in the following.

0034The adhesive comprises (A) water soluble polymer and (B) (meth)acrylic ester monomer which gives water soluble or water swelling polymer by polymerization.

0035An example of the water soluble polymer of the component (A) is polymer prepared from a monomer having the following formula (V): <chemistry id="chem0005" num="0005"><img file="EP0452808A2_D0005.tif" /></chemistry> wherein R₅ is hydrogen or methyl group, R₆ is alkylene group of 2 to 4 carbon atoms, R₇ is alkyl group of 1 or more than 1 carbon atoms and n is an integer of 1 or more than 1, such as (meth)acrylic ester, acrylic acid, vinylpyrrolidone, acrylamide, dimethylaminoethyl (meth)acrylate, diethylaminoethyl (meth)acrylate, vinyl methyl ether and the like. A water soluble polymer prepared by copolymerizing 30 weight part or less of acrylic ester, vinyl acetate, styrene and the like monomer with 100 weight parts of the monomer having the formula (V) may be optionally utilized as the water soluble polymer of the component (A).

0036Example of (meth)acrylic ester monomer of the component (B) are: (meth)acrylic ester, dimethylaminoethyl (meth)acrylate, diethylaminoethyl (meth)acrylate and the like.

0037Still another example of the water swelling adhesive is the adhesive described in Laid Open Japanese Patent Publication Showa 56-70077 which is described in the following.

0038The adhesive comprises (A) a salt of a copolymer prepared by neutralizing carboxylic acid in a copolymer comprising 10 to 40 mole% of monomer having carboxyl group, 60 to 90 mole % of alkyl (meth)acrylate in which the alkyl group has 4 or more carbon atoms and 0 to 20 mole % of other vinyl monomer and (B) a hydrophillic compound having the formula: R₈O(R₉O)_mR₁₀, wherein R₈ is alkyl group of 1 to 4 carbon atoms, R₉ is alkylene group of 2 to 4 carbon atoms, R₁₀ is hydrogen or alkyl group or acetyl group of 1 to 4 carbon atoms and m is an integer of 1 to 6.

0039When the printing operation using the plate roll of the invention 2 is finished and the printing plate made of resin attached to the base plate roll is detached, water is added to the adhesive sheet remaining on the face of the base plate roll or the printing plate. The adhesive sheet is swelled by water and the adhesive ability of the adhesive sheet is lost. The adhesive sheet and adhesive layer are removed completely with ease.

0040The adhesive sheet of the invention 3 is the adhesive sheet utilized for the plate roll of invention 1. The adhesive sheet comprises a layer of the photo curable adhesive and a removable sheet on one or both faces of the adhesive layer.

0041The adhesive sheet comprising a layer of the photo curable adhesive and a removable sheet only on one face of the adhesive layer can be stored in the form of roll. It is desirable that the faces of the removable sheet have such characteristics that a face of the removable sheet is more easily removed from the adhesive than the other face of the removable sheet.

0042When the ease of removal of the adhesive from the removable sheet is different between the two faces of the removable sheet, the problem that the adhesive coated originally on one face of the removable sheet is separated on the both faces of the removable sheet in the roll can be surely prevented during the operation. When the adhesive sheet is utilized, it is pulled out from the roll, the adhesive face of the adhesive sheet is pressed to the outer face of the base plate roll or to the inner face of the printing plate and the removable sheet is removed from the adhesive. The printing plate is attached to the base plate roll by pressing it against the base plate roll and the plate roll is prepared.

0043When the adhesive sheet comprises a layer of the photo curable adhesive and a removable sheet on both faces of the adhesive layer, it is desirable that the removable sheet at one face of the adhesive layer is more easily detached from the adhesive than the removable sheet at the other face of the adhesive layer by the same reason as described. When the adhesive sheet is utilized, the removable sheet which can be removed from the adhesive more easily is first removed from the adhesive sheet and the adhesive sheet is pressed to the outer face of the base plate roll or to the inner face of the printing plate and the remaining removable sheet is removed from the adhesive. The printing plate is attached to the base plate roll by pressing it against the plate roll and the plate roll is prepared.

0044When the operation of printing is finished by using the adhesive sheet of invention 3, the plate roll attached with the printing plate made of resin is irradiated by, for example, ultraviolet light for 20 to 30 seconds from the surface of the printing plate made of resin. The photo curable adhesive on the inner face of the printing plate is cured by the irradiation and loses adhesive ability. Thus, the printing plate is easily detached from the plate roll by hand. Remaining adhesive on the faces are removed easily.

0045The adhesive sheet of the invention 4 comprises a supporting sheet and two layers of adhesive coated on both faces of the supporting sheet and at least one of the two layers of adhesive comprises the photo curable adhesive. The adhesive sheet can be stored by attaching a removable sheet on one or both faces of the adhesive sheet.

0046The supporting sheet is not particularly limited. Examples of the supporting sheet are films of polyethylene terephthalate, nylon, polypropylene, polycarbonate and the like other materials. When ultraviolet light, visible light and infrared light are utilized for irradiation, films having higher transparency is preferable so that the light transmission is easier.

0047It is also preferable that the surface of the supporting sheet is activated by corona discharge or by like other methods to enhance the affinity of the adhesive and the surface.

0048When the adhesive sheet of the invention 4 having a removable sheet on one face of the sheet is utilized, the adhesive sheet is attached to the outer face of the plate roll or to the inner face of the printing roll by the face on which the adhesive is exposed. The removable sheet is removed and the printing plate is attached to the base plate roll by pressing to the base plate roll. It is desirable that the adhesive layer of photo curable adhesive is placed to the face of the base plate roll.

0049When the printing plate is attached to the base plate roll by utilizing the adhesive sheet of the invention 4 having photo curable adhesive on one face and conventional adhesive on the other face and the adhesive layer of the photo curable adhesive is placed to the face of the base plate roll, the adhesive on the surface of the base plate roll is cured by irradiation of ultraviolet light and the printing plate can be detached from the base plate roll while the adhesive sheet is still attached to the printing plate.

0050Printing plates made of resin are often disposed after the use. The adhesive sheet of the invention 4 having photo curable sheet only on one face is suitable for easy disposal because the adhesive sheet need not be removed.

0051When a printing plate made of resin is used again after it is utilized for printing, the adhesive sheet of the invention 4 having photo curable adhesive on the both faces is suitable for use.

0052The adhesive sheet of the invention 5 is utilized for the plate roll of the invention 2 and comprises a layer of water swelling adhesive and a removable sheet attached on one or both faces of the layer of the adhesive.

0053When the removable sheet is attached only on one face of the adhesive layer, the adhesive sheet can be stored in the form of roll. It is desirable that the faces of the removable sheet have such characteristics that a face of the removable sheet is more easily removed from the adhesive than the other face of the removable sheet.

0054When the ease of removal of the adhesive from the removable sheet is different between the two faces of the removable sheet, the problem that the adhesive coated originally on one face of the removable sheet is separated on the both faces of the removable sheet in the roll can be surely prevented during the operation. When the adhesive sheet is utilized, it is pulled out from the roll, the adhesive face of the adhesive sheet is pressed to the outer face of the base plate roll or to the inner face of the printing plate and the removable sheet is removed from the adhesive. The printing plate is attached to the base plate roll by pressing it against the base plate roll and the plate roll is prepared.

0055When the adhesive sheet comprises a layer of the water swelling adhesive and a removable sheet on both faces of the adhesive layer, it is desirable that the removable sheet at one face of the adhesive layer is more easily detached from the adhesive than the removable sheet at the other face of the adhesive layer by the same reason as described. When the adhesive sheet is utilized, the removable sheet which can be removed from the adhesive more easily is first removed from the adhesive sheet and the adhesive sheet is pressed to the outer face of the base plate roll or to the inner face of the printing plate and the remaining removable sheet is removed from the adhesive. The printing plate is attached to the base plate roll by pressing it against the plate roll and the plate roll is prepared.

0056When the operation of printing is finished by using the adhesive sheet of the invention 5, the printing plate made of resin is detached from the base plate roll by using a conventional method. Adhesive remaining on the surfaces of the base plate roll and printing plate made of resin is treated with water. The adhesive is swelled by water and loses adhesive ability and can be removed very easily by wiping with cloth or the like.

0057The adhesive sheet of the invention 6 comprises a supporting sheet and two water swelling adhesive layers coated on both faces of the supporting sheet. As the supporting sheet, a porous sheet is preferred because water penetrates easily in the sheet.

0058When the adhesive sheet of the invention 4 having the photo curable adhesive only on one face is coated with the water swelling adhesive on the other face, the adhesive sheet formed corresponds to the adhesive sheet of the invention 7. The plate roll is prepared by utilizing the adhesive sheet in the same way as in the invention 4.

0059The plate roll attached with the printing plate by utilizing the adhesive sheet of the invention 7 through the photo curable adhesive on the outer face of the base plate roll and the water swelling adhesive on the inner face of the printing plate is, after finishing the operation of printing, irradiated with ultraviolet light and the printing plate is removed from the face of the base plate roll while the adhesive sheet is still attached to the printing plate.

0060When the printing plate is dipped into water, the adhesive is swelled and the adhesive sheet is removed spontaneously from the printing plate. The remaining printing plate can be utilized again after drying.

0061When the base plate roll is attached with the printing plate through the water swelling adhesive on the outer face of the base plate roll and the photo curable adhesive on the inner face of the printing plate, the printing sheet remains on the surface of the base plate roll and can be removed by swelling with water.

0062The former method is preferable because the printing plate is quickly detached from the base plate roll.

0063The invention will be understood more readily with reference to the following examples; however these examples are intended to illustrate the invention and are not to be construed to limit the scope of the invention.

Example 1

0064Polyethylene terephthalate film of 50µ thickness activated by corona discharge on both faces was used as the supporting sheet for a double faced tape.

0065A removable sheet of polyethylene terephthalate film of 38µ thickness coated with silicone on one face was coated with a photo curable adhesive to 15µ thickness by a knife coater on the face coated with silicone. The adhesive was an acrylic adhesive comprising 40 weight % of trimethylolpropane (meth)acrylate and 5 weight % of benzoin was further added as the photo sensitizer.

0066The removable sheet coated with the photo curable adhesive was laminated to the both faces of the supporting sheet and a double face adhesive sheet was prepared.

0067One of the removable sheets on the adhesive sheet was removed and the adhesive sheet was pressed to a printing plate made of resin (Torayleaf®, a product of Toray Co., Ltd., 1 mm thickness). The other removable sheet was removed and the printing plate was attached to a stainless steel base plate roll by using the double face adhesive sheet.

0068After standing for 24 hours, the plate roll was irradiated with ultraviolet light by a 35 mW/cm² ultraviolet lamp for 20 seconds over the printing plate made of resin. Total dose of ultraviolet light irradiated was 700 mJ/cm².

0069After the irradiation, the printing plate made of resin was easily detached by fingers. The adhesive sheet remained attached to the face of the printing plate when the printing plate was detached from the base plate roll and was removed from the printing plate easily by fingers.

0070The same adhesive sheet as the above was laminated to the same printing plate as the above and used for adhesion test without attaching to the base plate roll. After standing for 24 hours, the adhesive strength was 1700 g/25 mm width. Then, ultraviolet light was irradiated to the outer face of the printing plate made of resin in the same condition as the above. Ten minutes after the irradiation, the adhesive strength decreased to 90 g/25 mm width.

Example 2

0071A removable sheet coated to the thickness of 50µ with an acrylic water swelling adhesive which comprised a copolymer of ethyl acrylate, vinyl acetate and methacrylic acid and polyethylene glycol lauryl ether and was crosslinked by zinc acetate in the presence of potassium hydroxide was utilized in place of one of the two removable sheets coated with adhesive utilized in Example 1. A porous sheet of polyethylene terephthalate treated by corona discharge was utilized as the supporting sheet. A printing plate was attached to a base plate roll by the same method as in Example 1.

0072After standing for 24 hours, ultraviolet light was irradiated by the same method as in Example 1. The printing plate was detached from the base plate roll easily by fingers.

0073When the printing plate was detached from the base plate roll, the adhesive sheet was firmly attached to the inner face of the printing plate. After dipping the printing plate in water for 3 hours, the adhesive sheet was removed from the printing plate easily by fingers.

0074While the invention has been particularly shown and described with reference to preferred embodiments threrof, it will be understood by those skilled in the art that the foregoing and other changes in form and details can be made therein without departing from the spirit and scope of the invention.

0075To summarize the advantages obtained by the invention, the plate roll attached with the printing plate made of resin according to the invention has advantages that the printing plate attached is easily detached, the adhesive sheet and remaining adhesive are easily removed after the operation of printing is finished and thus efficiency of the operation of printing is enhanced.