KR102036940B1 - Base film for liquid pressure transfer - Google Patents

Abstract

[Problem] A hydraulic transfer base film capable of sufficiently preventing curl when floating on a liquid surface, and capable of forming a hydraulic transfer transfer film having excellent transfer efficiency, a hydraulic transfer transfer film formed therefrom, and the hydraulic transfer transfer film are used. To provide a hydraulic transfer method.
[Measures] A base film 1 for hydraulic pressure transfer having a linear incision at an end portion 3; A film for hydraulic transfer formed by printing on the surface of the base film 1 for hydraulic transfer; And a step of floating the surface on which the printing for the hydraulic transfer film is printed on the liquid surface and pressing the transfer object from above the floating liquid surface transfer film.

Description

BASE FILM FOR LIQUID PRESSURE TRANSFER

The present invention provides a hydraulic transfer transfer base film for forming a hydraulic transfer transfer film for use in printing a transfer object such as a molded body having a concave-convex surface or a curved surface, a hydraulic transfer transfer film formed therefrom, and the hydraulic pressure. A hydraulic transfer method using a transfer film.

As a means for forming a printing layer for imparting designability or improving surface properties to a surface of a molded body having an uneven solid surface or a curved surface, a hydraulic pressure former having a transfer printing layer formed on a water-soluble or water-swellable film surface The method of using a use film is known. For example, in Patent Literature 1, the printing surface of the film for hydraulic transfer is lifted up on the liquid surface of a liquid represented by water, and then various kinds of molded bodies, which are transfer targets, are pushed from above, to use the hydraulic pressure on the surface of the transfer target body. A method of transferring a printed layer is described.

In the hydraulic transfer method, it is important to prevent curl when the film for hydraulic transfer is floated on the liquid surface. For example, Patent Literature 2 discloses curls due to a recent difference in the absorption of the design printing surface and the non-printing surface of a film for hydraulic transfer due to the printing of a design being multi-layer printing or the use of printing ink with excellent durability. In order to prevent this, it is described that heat treatment is performed on the surface on the side opposite to the surface in contact with the film forming belt or the film forming drum when the base film for hydraulic transfer is produced.

In addition, Patent Document 3 discloses a small shape of a circle or square shape in order to achieve a beautiful transfer print by effectively preventing curl generation at the peripheral end of the thin film when the water-soluble polymer thin film is floated on the surface and the transfer printing is performed on an object. It is described to use a thin film having a large number of holes formed at its ends.

Japanese Patent Laid-Open No. 54-33115 Japanese Unexamined Patent Publication No. 2009-1009 Japanese Laid-Open Patent Publication No. 55-41283

However, in the method of patent document 2, since the prevention effect of curl is still inadequate, the transfer efficiency was bad. On the other hand, in the method described in Patent Literature 3, it is not very easy to form a small hole as described therein, so that the productivity (production speed) of the hydraulic transfer base film is reduced or cut out when a small hole is formed. Debris adheres to the surface of the film to cause defects during printing on the surface of the hydraulic transfer base film or hydraulic transfer to the transfer object, or even when printing in the vicinity where the small hole is formed, the small hole portion during hydraulic transfer Since the printing was omitted, it was found that the vicinity of the formation of the small hole had a problem such that the effective area which could not contribute to the hydraulic transfer was substantially reduced, thereby reducing the effective area. Then, in this invention, the base film for hydraulic-transfer transcription | transfer which can form the film for hydraulic-transfer transcription | transform excellent in the transfer efficiency can be prevented sufficiently by the means different from the method of patent document 3, and it floats on the liquid surface, It is an object of the present invention to provide a hydraulic transfer film formed therefrom and a hydraulic transfer method using the hydraulic transfer film.

MEANS TO SOLVE THE PROBLEM As a result of earnestly examining in order to achieve the said objective, the present inventors formed the linear incision which was comparatively easy to form in the edge part of a hydraulic transfer base film beforehand, and represents the hydraulic transfer film formed using it by water. It was found that the curls when floated on the liquid surface were highly suppressed. MEANS TO SOLVE THE PROBLEM The present inventors made further examination based on the said knowledge, and completed this invention.

That is, the present invention,

[1] a hydraulic film transfer base film having a linear incision at an end,

[2] The base film for hydraulic transfer according to the above [1], having a linear incision at a ratio of 7 mm or more per 100 mm of the length of the end of the base film for hydraulic transfer;

[3] The base film for hydraulic transfer according to the above [1] or [2], having a linear infeed in a range of 1 to 10 mm from the end of the base film for hydraulic transfer;

[4] the base film for hydraulic transfer according to any one of the above [1] to [3], which is a polyvinyl alcohol film;

[5] A film for hydraulic transfer, wherein the film is printed on the surface of the base film for hydraulic transfer according to any one of the above [1] to [4];

[6] The present invention relates to a liquid pressure transfer method having a step of floating the surface on which the hydraulic transfer film of [5] is printed on a liquid surface and a step of pressing the transfer object from above the floating pressure transfer film.

ADVANTAGE OF THE INVENTION According to this invention, the base film for hydraulic transfer which can fully prevent the curl when floating on the liquid surface, and can form the film for hydraulic transfer excellent in the transfer efficiency, the film for hydraulic transfer formed therefrom, and the said film for hydraulic transfer A hydraulic transfer method is provided.

1 is a schematic view showing an example of an embodiment of the present invention.
Fig. 2 is a schematic diagram showing a method for measuring the length of the linear incisions per 100 mm of the length of the stage.
3 is a schematic view showing each embodiment described in the examples.

EMBODIMENT OF THE INVENTION Below, this invention is demonstrated in detail.

The base film for hydraulic pressure transfer of this invention has a linear cut in the edge part (part of the edge vicinity of the base film for hydraulic pressure transfer). By having a linear incision in an edge part, the curl at the time of floating the film for hydraulic transfer formed thereon on a liquid surface can fully be prevented. Although this invention is not limited at all, it is thought that this is because the progress of curl stops by the said incision even if curl generate | occur | produced from the end of the film for hydraulic pressure transfer. Moreover, unlike the case of the small hole as described in patent document 3, linear incision is comparatively easy to form, and it can manufacture a base film for hydraulic-transfer transcription | transfer with favorable productivity, and also it does not generate | occur | produce brittleness, Furthermore, The vicinity in which the linear incision is formed can also contribute to hydraulic transfer, and the reduction of the effective area of the hydraulic transfer film can also be reduced.

The general hydraulic transfer base film may be a long film, or may be a rectangular film. In the case of a long film, the surface of the film is printed on the surface while continuously feeding the rolled form into a film for hydraulic transfer. Then, after winding up in roll shape as it is or once, it can draw out again and can provide to a hydraulic transfer continuously. In the base film for hydraulic transfer of the present invention, the shape may be a long film, or may be a rectangular film having a relatively short length (for example, one side has a length of less than 1 m), or may be either. Although a polygonal shape such as a triangle, a pentagon, or a circular shape may be used, a long film and a rectangular film are preferable from the viewpoint of handleability during hydraulic transfer and the like, and it is possible to continuously perform printing or hydraulic transfer. In view, long films are preferred.

Although there is no restriction | limiting in particular in the length and width in a long film, From a viewpoint of the productivity at the time of printing, it is preferable that length is 1 m or more, It is more preferable that it is 100 m or more, It is more preferable that it is 1000 m or more. Moreover, as an upper limit of length, 10000 m is mentioned, for example. On the other hand, it is preferable that width is 50 cm or more from a viewpoint of the productivity improvement at the time of printing, It is more preferable that it is 80 cm or more, It is further more preferable that it is 100 cm or more. Moreover, it is preferable that it is 4 m or less, and, as for the said width, the point which is easy to produce the base film for hydraulic transcription which has a uniform thickness, and it is more preferable that it is 3 m or less.

The base film for hydraulic pressure transfer of this invention has linear incision at the edge part. In the present invention, macroscopically, at least a part of the end portion of the hydraulic transfer base film should just have a linear incision. For example, in the case where the hydraulic transfer base film of the present invention has a relatively short rectangle, it is one of four sides. You may have a linear incision only in the edge part of two sides which oppose. However, in terms of being able to prevent curling more effectively, it is preferable to have a linear incision over the entire end along all the ends of the hydraulic transfer base film which is brought into contact with the liquid surface during hydraulic transfer. Specifically, in the case where the base film for hydraulic transfer of the present invention is a rectangular film having a relatively short length, it is preferable to have a linear incision over the entire end portion near four sides, and in the case of a long film, two long sides It is preferable to have linear incision over the whole edge part of the vicinity, and, in the case of circular shape, it is preferable to have linear incision over the whole edge part which rotates.

Said linear incision may penetrate in the thickness direction of a hydraulic transfer base film, and may open only to one surface of a hydraulic transfer base film, or whichever may be cut | disconnected easily, Moreover, since the prevention effect of a curl is exhibited more remarkably, it is preferable that linear incision penetrates in the thickness direction of the base film for hydraulic transcription. Moreover, even if only one surface of the hydraulic transfer base film is opened, the thickness of the non-penetrating portion can be made very thin, so that the obtained hydraulic transfer film is floated on the liquid surface within a few seconds (for example, within 3 seconds). It can penetrate, and such incision is also one of the preferable aspects.

Said linear incision may exist intermittently in the direction along the edge of the hydraulic transfer base film, and it may be continuous in the direction along a step in the case where the said incision is opening only to one surface of the hydraulic transfer base film. Although it may exist, either may be sufficient, It is preferable to exist in intermittent plurality in the direction along a stage from the surface etc. of the intensity | strength of the base film for hydraulic transcription. There is no restriction | limiting in particular in the shape which looked at each linear cut-out from the film surface side, A straight line, a cut line, a curve, the shape in which two or more of these were combined, etc. are mentioned. Among these, since the transfer efficiency of the film for hydraulic transcription obtained becomes more excellent, and the formation of an incision is also simpler, the said shape is preferably linear.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows an example in the case where a base film for hydraulic pressure transcription | transfers is a long film and has linear incision over the whole edge part of two long sides vicinity. In FIG. 1, the plurality which penetrates in the thickness direction of a base film for hydraulic transcription across the whole edge part 3 which is a part near the edge 2 corresponding to two long sides of the long base film 1 for hydraulic transmission. Linear infeed 4 is formed. Here, each linear cut-out 4 is linear in the shape seen from the film surface side, and the some cut-out 4 intermittently exists in the direction along the edge 2 of the base film 1 for hydraulic transcription.

Although there is no restriction | limiting in particular in the magnitude | size of each linear cut, The length is preferable in the range of 3-50 mm, It is more preferable to exist in the range of 7-35 mm from the point which can prevent curl more effectively, It is more preferable to exist in the range of 10-25 mm. Moreover, the line width of the opening part of linear incision is normally less than 200 micrometers, It is preferable that it is 150 micrometers or less, It is more preferable that it is 100 micrometers or less, It is more preferable that it is 70 micrometers or less, Moreover, the opposing cross sections of an incision are at least the In part, they may be in contact with each other.

In addition, it is preferable that each linear incision exists substantially parallel to the end of the base film for hydraulic transfers (tangential point in the point closest to the incision to which it is a target when a step is not a straight line). In this case, the angle between the end of the hydraulic transfer base film and the linear infeed is approximately 0 °, as well as a slight deviation (preferably within ± 30 °, more preferably about parallel to the end of the hydraulic transfer base film). Means within ± 10 °). In addition, when the shape which saw individual linear incision from the film surface side is other than a straight line, the line segment which connects the shortcomings in individual linear incision (when there exists more than one line segment of the length of the largest line segment) is It is preferable that it is substantially parallel to the stage of the base film for hydraulic pressure transfer.

In order to reduce the curl area ratio to be described later, the base film for hydraulic transfer of the present invention preferably has the linear incision as close to the end as possible. Specifically, the distance from the end of the hydraulic transfer base film to the linear cutting is preferably 10 mm or less, more preferably 8 mm or less, and even more preferably 6 mm or less. On the other hand, when the distance from the end is too short, the prevention effect of curl may be reduced, so the distance is preferably 1 mm or more. Herein, the distance from the stage to the linear infeed refers to the minimum distance (shortest distance) among the distances between the points on the linear incision and the stage.

Since the base film for hydraulic-transfer transcription | transfer of this invention can prevent curl more effectively, it is preferable to have said linear incision in the ratio of 7 mm or more per 100 mm of length of the said stage, and said said at the ratio of 10 mm or more It is more preferable to have linear incision. Moreover, it is preferable to have said linear incision in the ratio of 50 mm or less per 100 mm of lengths from a surface, such as the strength of the base film for hydraulic transcription. As shown in FIG. 2, the above ratio is obtained when the linear incision 4 (when a plurality is present) is projected in the vertical direction on the paper surface with respect to the stage 2 of the base film for hydraulic transfer. After dividing the sum of the lengths of the line segments (the sum of the length L1 and the length L2 in FIG. 2) by the length of the stage 2, it can be calculated as a value per 100 mm of the length of the stage 2.

As a material which comprises the base film for hydraulic transcription of this invention, the thing by which the base film for hydraulic transcription obtained becomes water-soluble can be used, Specifically, polyvinyl alcohol, carboxymethyl cellulose, hydroxyethyl cellulose, polyvinyl film Although there may be mentioned ralidone, polyacrylic acid or its salt, starch, gelatin, etc., it is relatively easy to change all conditions, such as the degree of polymerization, saponification degree, and the combination of additives, such as starch, and therefore, the required mechanical strength and handling Polyvinyl alcohol is preferable because the moisture resistance can be controlled.

When the base film for hydraulic pressure transfer is a polyvinyl alcohol (hereinafter, "polyvinyl alcohol" may be abbreviated as "PVA") film, the PVA may include vinyl acetate, vinyl formate, vinyl propionate, vinyl butyrate, and pivalic acid. What is obtained by saponifying the polyvinyl ester obtained by superposing | polymerizing 1 type (s) or 2 or more types of vinyl esters, such as vinyl, a vinyl basatate, a vinyl laurate, a vinyl stearate, a vinyl benzoate, and isopropenyl acetate, can be used. Among the above-mentioned vinyl esters, vinyl acetate is preferable in view of the ease of production of PVA, the availability, cost, and the like.

It is preferable that said polyvinyl ester is obtained using only 1 type, or 2 or more types of vinyl esters as a monomer, It is more preferable that it was obtained using only 1 type of vinyl ester as a monomer, However, the range which does not inhibit the effect of this invention If it is inside, the copolymer of 1 type, or 2 or more types of vinyl ester and the other monomer copolymerizable with this may be sufficient.

As another monomer copolymerizable with said vinyl ester, For example, C2-C30 alpha olefins, such as ethylene, propylene, 1-butene, isobutene; (Meth) acrylic acid or its salts; Methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, i-propyl (meth) acrylate, n-butyl (meth) acrylate, i-butyl (meth) acrylate, t- (meth) acrylate (Meth) acrylic acid ester, such as butyl, 2-ethylhexyl (meth) acrylic acid, dodecyl (meth) acrylate, and octadecyl (meth) acrylate; (Meth) acrylamide, N-methyl (meth) acrylamide, N-ethyl (meth) acrylamide, N, N-dimethyl (meth) acrylamide, diacetone (meth) acrylamide, (meth) acrylamide propanesulfonic acid Or (meth) acrylamide derivatives such as salts thereof, (meth) acrylamidepropyldimethylamine or salts thereof, N-methylol (meth) acrylamide or derivatives thereof; N-vinylamides, such as N-vinylformamide, N-vinylacetamide, and N-vinylpyrrolidone; Vinyl such as methyl vinyl ether, ethyl vinyl ether, n-propyl vinyl ether, i-propyl vinyl ether, n-butyl vinyl ether, i-butyl vinyl ether, t-butyl vinyl ether, dodecyl vinyl ether, stearyl vinyl ether Ether; Vinyl cyanide such as (meth) acrylonitrile; Vinyl halides such as vinyl chloride, vinylidene chloride, vinyl fluoride and vinylidene fluoride; Allyl compounds such as allyl acetate and allyl chloride; Maleic acid or its salts, esters or acid anhydrides; Itaconic acid or its salt, ester or acid anhydride; Vinyl silyl compounds such as vinyl trimethoxysilane; Unsaturated sulfonic acid; and the like. Said polyvinyl ester can have a structural unit derived from 1 type (s) or 2 or more types of said other monomer.

It is preferable that it is 25 mol% or less based on the number-of-moles of all the structural units which comprise polyvinyl ester, and, as for the ratio of the structural unit derived from said other monomer in the said polyvinyl ester, it is more preferable that it is 15 mol% or less. It is preferable and it is more preferable that it is 5 mol% or less. When the said ratio exceeds 25 mol%, there exists a tendency for the affinity etc. of the base film for hydraulic pressure transfer and a printing layer to fall.

As long as said PVA exists in the range which does not impair the effect of this invention, what modified | denatured by the monomer which can be graft copolymerized by 1 type, or 2 or more types may be sufficient. As a monomer which can be graft-copolymerized, For example, unsaturated carboxylic acid or its derivative (s); Unsaturated sulfonic acid or derivatives thereof; C2-C30 alpha olefin, etc. are mentioned. It is preferable that the ratio of the structural unit derived from the graft copolymerizable monomer in PVA is 5 mol% or less based on the number-of-moles of all the structural units which comprise PVA.

A part of the hydroxyl group may be bridge | crosslinked in said PVA, and it is not necessary to be bridge | crosslinked. In the PVA, a part of the hydroxyl groups may react with an aldehyde compound such as acetaldehyde, butyl aldehyde or the like to form an acetal structure, and may not react with these compounds to form an acetal structure.

It is preferable that the polymerization degree of said PVA exists in the range of 500-3000, It is more preferable to exist in the range of 700-2800, It is still more preferable to exist in the range of 1000-2500. When the degree of polymerization of PVA is less than 500, the mechanical strength of the obtained base film for hydraulic pressure transfer may be insufficient. On the other hand, when the polymerization degree of PVA exceeds 3000, the production efficiency at the time of manufacturing a hydraulic transfer base film may fall, and also the water solubility of a hydraulic transfer base film and also a hydraulic transfer film will fall and it will be economical. It may become difficult to perform hydraulic pressure transfer at the phosphorus process speed. In addition, the polymerization degree of PVA as used in this specification means the average polymerization degree measured based on description of JISK6726-1994.

It is preferable that the saponification degree of said PVA exists in the range of 80-99 mol%, It is more preferable to exist in the range of 83-96 mol%, It is still more preferable to exist in the range of 85-90 mol%. When the saponification degree of PVA is less than 80 mol%, the water solubility of a hydraulic transfer base film and also a hydraulic transfer film falls, and it may become difficult to perform hydraulic transfer at an economical process speed. On the other hand, even when the saponification degree of PVA exceeds 99 mol%, the water solubility of a hydraulic transfer base film and a hydraulic transfer film falls, and it may become difficult to perform hydraulic transfer at an economical process speed. In addition, the saponification degree of PVA in this specification means the said vinyl alcohol unit with respect to the total number-of-moles of the structural unit (typically a vinyl ester unit) and vinyl alcohol unit which PVA has can be converted into a vinyl alcohol unit by saponification. The ratio (mol%) which the mole number of occupies says. Saponification degree can be measured according to description of JISK6726-1994.

Flexibility can be provided by containing a plasticizer in said PVA film. As a plasticizer, polyhydric alcohol is preferable, and ethylene glycol, glycerin, propylene glycol, diethylene glycol, diglycerol, triethylene glycol, tetraethylene glycol, trimethylol propane etc. are mentioned as a specific example. It is preferable that it is 20 mass parts or less with respect to 100 mass parts of PVA, and, as for content of the plasticizer in a PVA film, it is more preferable that it is 15 mass parts or less. When content of a plasticizer exceeds 20 mass parts, blocking of a PVA film may generate | occur | produce.

In addition, the mechanical strength required for forming the printing layer on the hydraulic transfer base film is imparted, and the moisture resistance when handling the hydraulic transfer base film is maintained, or the hydraulic transfer film having the printing layer formed on the liquid surface. For the purpose of adjusting the rate of softening by absorption of the liquid when absorbed, the ductility in the liquid surface, the time required for diffusion into the liquid, the ease of deformation in the hydraulic transfer process, and the like. It is preferable to contain water-soluble polymers other than starch and / or PVA in said PVA film.

As starch, For example, natural starches, such as corn starch, potato starch, sugar cane starch, wheat starch, rice starch, tapioca starch, sago starch; Processed starch etc. which etherification process, esterification process, oxidation process, etc. were performed are mentioned, Processed starch is especially preferable. It is preferable that it is 15 mass parts or less with respect to 100 mass parts of PVA, and, as for content of starch in a PVA film, it is more preferable that it is 10 mass parts or less. When the content of starch exceeds 15 parts by mass, the impact resistance of the base film for hydraulic transfer and the film for hydraulic transfer decreases and becomes vulnerable, and the process passability may decrease.

As water-soluble polymers other than PVA, for example, dextrin, gelatin, glue, casein, shellac, gum arabic, polyacrylamide, sodium polyacrylate, polyvinyl methyl ether, copolymer of methyl vinyl ether and maleic anhydride, acetic acid Copolymers of vinyl and itaconic acid, polyvinylpyrrolidone, cellulose, acetyl cellulose, acetylbutyl cellulose, carboxymethyl cellulose, methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, sodium alginate and the like. It is preferable that it is 15 mass parts or less with respect to 100 mass parts of PVA, and, as for content of water-soluble polymers other than PVA in a PVA film, it is more preferable that it is 10 mass parts or less. When content of water-soluble polymers other than PVA exceeds 15 mass parts, the solubility and dispersibility of the film for hydraulic pressure transfer at the time of hydraulic pressure transfer may fall.

In addition, the above-mentioned PVA is used for the purpose of controlling the speed of softening by absorption of liquid when the liquid transfer film having a printed layer formed thereon is placed on the liquid surface, the conductivity of the liquid surface, the time required for diffusion into the liquid, and the like. It is preferable to contain additives, such as a boron type compound and surfactant, in a film.

As a boron type compound, boric acid and borax are preferable. It is preferable that it is 5 mass parts or less with respect to 100 mass parts of PVA, and, as for content of the boron type compound in a PVA film, it is more preferable that it is 1 mass part or less. When content of a boron type compound exceeds 5 mass parts, the water solubility of a base film for hydraulic transfers or a film for hydraulic transfers falls, and it may become difficult to perform hydraulic transfer at an economical process speed.

There is no restriction | limiting in particular as surfactant, A well-known anionic surfactant, cationic surfactant, nonionic surfactant, etc. can be used. It is preferable that it is 5 mass parts or less with respect to 100 mass parts of PVA, and, as for content of surfactant in a PVA film, it is more preferable that it is 1 mass part or less. When content of surfactant exceeds 5 mass parts, the base film for hydraulic pressure transfers will be easy to adhere, and handleability may fall.

In addition to the above components, the PVA film can contain other components such as a heat stabilizer, a ultraviolet absorber, an antioxidant, a colorant, and a filler. Although content of these other components changes also with the kind, Usually, it is preferable that it is 10 mass parts or less with respect to 100 mass parts of PVA, and it is more preferable that it is 5 mass parts or less. When content of another component exceeds 10 mass parts, the impact resistance of a base film for hydraulic transfers may deteriorate.

It is preferable that it is in the range of 2-6 mass%, and, as for the moisture content of the base film for hydraulic pressure transfer of this invention, it is more preferable to exist in the range which is 3-5 mass%. When moisture content is less than 2 mass%, the moisture content of the film for hydraulic pressure transfer obtained also tends to become low, and there exists a tendency for the grade of curl to become large at the time of hydraulic pressure transfer. On the other hand, when moisture content exceeds 6 mass%, there exists a tendency which tends to generate | occur | produce the problem, such as the precision of printing falling.

What is necessary is just to select the thickness of the base film for hydraulic-transfer transcription | transfer of this invention suitably in consideration of the balance of water solubility and process passability, Usually, in the range of 10-100 micrometers, Preferably it is in the range of 20-80 micrometers, More preferably, It is good to exist in the range of 30-50 micrometers. When thickness is less than 10 micrometers, the intensity | strength of a hydraulic transfer base film may be insufficient, and the fall of a process passability may arise. On the other hand, when thickness exceeds 100 micrometers, the water solubility of a hydraulic transfer base film and a hydraulic transfer film may fall, and it may become difficult to perform hydraulic transfer at an economical process speed.

Moreover, in order to improve the printability at the time of forming a printing layer in a hydraulic transfer base film, or to improve the slip property of the surface of a hydraulic transfer base film, a mat process is given to the surface of a hydraulic transfer base film. It is desirable to have. As a method of a mat | matte process, the online mat process which transfers the mat surface on a roll or a belt to a film at the time of film forming, the method of embossing after winding up a film formed into a film once, etc. are mentioned. It is preferable that it is 0.5 micrometer or more in Ra, and, as for the surface roughness of the surface to which the mat process was given, it is more preferable that it is 1 micrometer or more. As an upper limit of Ra, 10 micrometers is mentioned, for example. Moreover, it is preferable that it is 1 micrometer or more in Rmax, and it is more preferable that it is 3 micrometers or more. As an upper limit of Rmax, 20 micrometers is mentioned, for example.

According to the base film for hydraulic transfer of this invention, the film for hydraulic transfer which can fully prevent the curl at the time of floating on the liquid surface can be formed. The degree of curl of the film for hydraulic pressure transfer can be evaluated by modeling the degree of curl of the base film for hydraulic pressure transfer itself. In this specification, the curl area ratio is used as a method of evaluating the degree of curl of a base film for hydraulic pressure transfer. The curl area ratio is the ratio of the area of the portion which is not brought into contact with the surface by curling the end of the hydraulic transfer base film after being floated on the surface to the area of the hydraulic transfer base film before floating on the surface, Is measured. As the curl area ratio is smaller, curling is prevented, which means that the transfer efficiency of the hydraulic transfer film is excellent. Specifically, 7% or less is preferable, 6% or less is more preferable, and 5% or less. More preferred.

There is no restriction | limiting in particular in the manufacturing method of the base film for hydraulic pressure transfer of this invention, For example, The method of forming a film without a cut | disconnection beforehand and forming linear incision in this; Although the convex part for forming linear incision is formed in the support body for film forming, The method of forming linear incision simultaneously when forming a film is mentioned, The film without an incision is formed into a film previously from the ease of film forming, etc., The method of forming a linear incision in this is preferable. Although it does not specifically limit as a formation method of linear incision with respect to the film formed into a film, For example, when manufacturing a long hydraulic transfer base film, it is lined at both ends using a perforation cutter etc. with respect to a long film. It is good to form incision continuously, and when manufacturing the sheet | leaf-like hydraulic transfer base film, such as a rectangular film, it is good to form a linear incision at the edge part for every batch using a cutter knife etc.

As mentioned above, in any case of forming a film without cutting in advance, and simultaneously forming a linear incision at the time of film forming, there is no restriction | limiting in particular in the film forming method of a film, According to the kind of material which comprises a film, etc., it is flexible A film can be formed by employ | adopting film forming methods, such as a method, an extrusion method, a melting method, and an inflation method, suitably. Moreover, unstretched may be sufficient as the film after film forming, and you may perform uniaxial stretching or biaxial stretching in order to improve a mechanical characteristic according to the transfer conditions at the time of liquid level transfer.

By printing on the surface of the hydraulic film transfer base film of this invention, it can be set as the film for hydraulic transfer. There is no restriction | limiting in particular in the said printing method, A printing layer can be formed by employ | adopting a well-known printing system, For example, gravure printing, screen printing, offset printing, a roll coat, etc. can be employ | adopted. The printing may be performed directly on the hydraulic transfer base film by printing ink, or may be printed by transferring the transfer layer onto the hydraulic transfer base film after the printing layer is once formed on another film. In the case of printing directly on the hydraulic transfer base film with printing ink as in the former case, the latter may cause limitations in the composition of the printing ink, problems of the drying process, and problems of color deviation in multicolor printing. It is preferable to perform printing by forming a printing layer once on another film as described above, and then transferring it to a base film for hydraulic transfer. As a printing ink used for printing, a conventionally well-known thing can be used.

The above-mentioned hydraulic transfer film can be placed on a liquid surface such as water with the printed surface facing up, and hydraulic transfer can be performed by pressing transfer objects such as various molded bodies from above. As a more detailed hydraulic transfer method, for example, the first step of activating the printing layer by spraying the ink activator and spraying an ink activator with the surface on which the hydraulic transfer film is printed face up, and activating the printing layer, The second step of lowering and pressurizing the transfer target body from the upper side of the film to be used as the transfer surface downward, and after the printing layer of the film for hydraulic transfer is sufficiently adhered to the surface of the transfer body, the hydraulic pressure transfer in the hydraulic transfer film The hydraulic transfer method which consists of each process of the 3rd process of removing a used base film part, and the 4th process of fully drying the to-be-transferred body which the printing layer transferred to the to-be-transferred surface is mentioned.

There is no restriction | limiting in particular in the kind of transfer object, For example, Wooden base materials, such as a wood, a plywood, a particle board; Various plastics; Gypsum board ; Fiber cement boards such as pulp cement board, slate board and asbestos cement board; Calcium silicate plate; Magnesium silicate plate; Glass fiber reinforced cement; concrete ; Metal plates such as iron, stainless steel, copper and aluminum; These composites, etc. are mentioned. The object to be transferred may have a flat surface, a rough surface, a concave-convex shape, or any one, but may be a transfer object having a concave-convex solid surface or a curved surface. It is preferable at the point which can utilize more effectively.

Example

Hereinafter, although an Example demonstrates this invention still in detail, this invention is not limited at all by these. Moreover, the measuring method of the moisture content and the curl area rate of the base film for hydraulic pressure transfer is described below.

Water content measurement of the base film for hydraulic transfer

It was measured using a Karl Fischer moisture meter.

Curl area ratio measurement of hydraulic transfer base film

After putting 10 liters of water in the container of 420 mm x 320 mm x 160 mm height, and adjusting it to 30 degreeC, the base film for hydraulic transcription produced by the following example or the comparative example (size: 200 mm x 200) Mm) was floated on the water surface in the said container so that the surface on the opposite side to the surface which contact | connects the stainless steel belt at the time of film forming may be in contact with water. By this operation, the end of the hydraulic transfer base film is usually curled upward with respect to the water surface. 25 seconds after starting to float, the area (Amm <2>) of the part which contacted the water surface was measured, and the curl area ratio (%) was computed by following Formula. In addition, said area (Amm <2>) was measured by image-processing the image data obtained by camera-photographing a series of operation | movement with a computer.

Curl area ratio (%) = [1-A / (200 × 200)] × 100

It was determined that curl area ratio was 7% or less as "(circle)" (good), and the thing larger than 7% was determined as "x" (bad).

[Production Example 1]

Manufacture of base film for hydraulic transfer

Contains 88 mass% of saponification degree, 100 mass parts of PVA of polymerization degree 2400, 3 mass parts of glycerin, 5 mass parts of corn starch (average particle size 20 micrometers), 0.7 mass part of borax, and 1 mass part of polyoxyethylene sorbitan monolaurate And the aqueous solution whose density | concentration of PVA is 18 mass% was cast | flow_spreaded on the stainless steel belt of the temperature of 95 degreeC, and it dried for 2 minutes. After drying, the surface on the side opposite to the surface in contact with the belt was heat treated with an 80 ° C heat treatment roll for 8 seconds to obtain a PVA film having a thickness of 40 μm.

Example 1

After cutting out the square film of 200 mmx200 mm from the PVA film obtained by the manufacture example 1, using a cutter knife, as shown in (a) of FIG. 3, it is a linear form of length 10mm in the position of 5 mm from the edge of one side. Two cuttings (penetrating in the thickness direction of the film; the line width of the opening portion of 70 µm or less) were formed. It cut | disconnected similarly in the edge part of the remaining three sides, and it was set as the base film for hydraulic pressure transfer (water content 4.0 mass%) for curl area ratio measurement, and the curl area ratio was measured according to the said method. The results are shown in Table 1.

Example 2

After cutting out the square film of 200 mm x 200 mm from the PVA film obtained by the manufacture example 1, using a cutter knife, as shown in FIG.3 (b), it is a linear form of length 20mm in the position of 5 mm from the edge of one side. One incision (penetrating in the thickness direction of the film; the line width of the opening portion is 70 µm or less) was formed. It cut | disconnected similarly in the edge part of the remaining three sides, and it was set as the base film for hydraulic pressure transfer (water content 4.0 mass%) for curl area ratio measurement, and the curl area ratio was measured according to the said method. The results are shown in Table 1.

Example 3

After cutting out the square film of 200 mmx200 mm from the PVA film obtained by the manufacture example 1, using a cutter knife, it is a linear form of length 40mm in the position of 5 mm from the edge of one side as shown in (c) of FIG. One incision (penetrating in the thickness direction of the film; the line width of the opening portion is 70 µm or less) was formed. It cut | disconnected similarly in the edge part of the remaining three sides, and it was set as the base film for hydraulic pressure transfer (water content 4.0 mass%) for curl area ratio measurement, and the curl area ratio was measured according to the said method. The results are shown in Table 1.

Example 4

After cutting out the square film of 200 mmx200 mm from the PVA film obtained by the manufacture example 1, using a cutter knife, as shown in (d) of FIG. 3, it is linear form of length 10mm in the position of 5 mm from the edge of one side. Two cuttings (penetrating in the thickness direction of the film; the line width of the opening portion of 70 µm or less) were formed. It cut | disconnected similarly in the edge part of the remaining three sides, and it was set as the base film for hydraulic pressure transfer (water content 4.0 mass%) for curl area ratio measurement, and the curl area ratio was measured according to the said method. The results are shown in Table 1.

Example 5

After cutting out the square film of 200 mm x 200 mm from the PVA film obtained by the manufacture example 1, using a cutter knife, as shown in (e) of FIG. 3, it is a linear form of length 20mm in the position of 10 mm from the edge of one side. One incision (penetrating in the thickness direction of the film; the line width of the opening portion is 70 µm or less) was formed. It cut | disconnected similarly in the edge part of the remaining three sides, and it was set as the base film for hydraulic pressure transfer (water content 4.0 mass%) for curl area ratio measurement, and the curl area ratio was measured according to the said method. The results are shown in Table 1.

Example 6

After cutting out the square film of 200 mmx200 mm from the PVA film obtained by the manufacture example 1, using a cutter knife, as shown in (f) of FIG. 3, linear form of length 5mm at the position of 5 mm from the edge of one side. Four cut-outs (penetrating in the thickness direction of a film; the line width of an opening part are 70 micrometers or less) were formed. It cut | disconnected similarly in the edge part of the remaining three sides, and it was set as the base film for hydraulic pressure transfer (water content 4.0 mass%) for curl area ratio measurement, and the curl area ratio was measured according to the said method. The results are shown in Table 1.

Comparative Example 1

After cutting out the 200-mm * 200-mm square film (water content 4.0 mass%) from the PVA film obtained by the manufacture example 1, it was used as it is as a base film for hydraulic-transfer transcription | transfer for Curl | Karl area rate measurement, and it curled according to the said method. The area ratio was measured. The results are shown in Table 1.

In the base film for hydraulic transfer of Examples 1-6, the value of the curl area ratio is small, it can be seen that the curl when floating on the liquid surface can be sufficiently prevented, and the film for hydraulic transfer having excellent transfer efficiency can be formed. have. On the other hand, in the base film for hydraulic pressure transfer of the comparative example 1, the value of the curl area ratio was large.

Industrial availability

The base film for hydraulic transfer of the present invention can sufficiently prevent curls when floated on the liquid surface, can form a film for hydraulic transfer having excellent transfer efficiency, and has a surface having a three-dimensional or curved surface with irregularities. It can use suitably for the hydraulic transfer at the time of forming a printing layer in the present invention.

1: base film for hydraulic transfer
2:
3: end
4: infeed on board

Claims (6)

As a base film for hydraulic transfer which has linear incision in an edge part,
It has the said linear incision in the ratio of 7 mm or more per 100 mm of length of the stage of the said hydraulic-pressure transfer base film,
The linear incision is present in parallel with respect to the end of the hydraulic transfer base film at an angle within ± 30 °, and the distance from the end of the hydraulic transfer base film to the linear incision is 1 to 10 mm, Base film for hydraulic transfer. The method of claim 1,
A base film for hydraulic transfer, which is a polyvinyl alcohol film. The film for hydraulic pressure transfer which forms by printing on the surface of the base film for hydraulic pressure transfer of Claim 1 or 2. The hydraulic transfer method which has the process which floats the film on which the printing for hydraulic pressure transfer of Claim 3 surfaced on the liquid surface, and pressurizes a to-be-transferred body from above the floating hydraulic transfer film. delete delete

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