Printing boards and printing plate products using the same

Abstract

To provide an engraving board which is easy to carve using cutting tools such as chisels and is less likely to be chipped or cracked after completion, and to provide a print art engraved board products using the same.SOLUTION: An engraving board provided herein consists of a molded product containing a vinyl chloride resin having an average polymerization degree of 650 to 5000 and a plasticizer having a dissolution parameter of 8 to 11. The engraving board of the present invention can be easily carved. In the meanwhile, a robust print art engraved board product can be obtained by heating the engraving board of the present invention further.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a printing plate and a printing plate precursor product using the same, and more particularly to a printing plate having excellent machinability and a printing plate precursor product using the same. [Background technology]

[0002] Printmaking is carried out, for example, by carving a design such as letters or figures into a printing plate (also called printing material) using a cutting tool such as a carving knife, placing various coloring materials such as ink or paint on the uneven areas created by the cutting, and then transferring the coloring materials to a material such as paper. Such printmaking is enjoyed by many people, from preschoolers to adults. Some works created by skilled artisans known as famous printmakers and creators are highly regarded for their artistic and economic value. Furthermore, some of these printmaking masters are produced industrially and sold as printmaking master products.

[0003] Printing boards used for printmaking are made of various materials such as wood, copper, and rubber. In recent years, many creators have been using erasers or similar materials for their printing boards. For example, Patent Document 1 discloses a printing board whose base material is a specific vinyl chloride resin and a plasticizer. Printing boards made of such materials have the advantage that even minute patterns can be easily cut using, for example, a carving knife.

[0004] However, excellent machinability also poses a drawback in use. In other words, if a material is easy to cut, it can easily chip or crack when it is used as a printmaking master (product) with a completed design. If a printmaking master is prone to chipping and cracking, it can be difficult for printmakers and creators to properly transfer the delicate designs they wish to express. On the other hand, in order to prevent the printmaking master (product) from chipping or cracking, they have no choice but to use printing boards that are less easy to cut (so-called difficult to carve). This contradiction is one of the factors that hinder the free imagination and expression of printmakers and creators. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2008-15110 A Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention is intended to solve the above problems, and has as its object to provide a printing plate which is easily cuttable with cutting tools such as carving knives and which is less likely to chip or crack after completion, and a printing plate precursor product which uses the same. [Means for solving the problem]

[0007] The present invention relates to a printing plate comprising a molded body containing a vinyl chloride resin having an average degree of polymerization of 650-5000 and a plasticizer having a solubility parameter of 8-11.

[0008] In one embodiment, the plasticizer is at least one compound selected from the group consisting of benzoates, phosphates, phthalates, citrates, and sulfonates.

[0009] In one embodiment, the molded body does not contain a filler.

[0010] In one embodiment, the molded body is optically opaque.

[0011] The present invention also relates to a method for producing a printing plate, which includes a step of molding a mixture of a vinyl chloride resin having an average degree of polymerization of 650 to 5,000 and a plasticizer having a solubility parameter of 8 to 11 to obtain a molded body.

[0012] The present invention is also directed to a printing plate precursor product comprising the heating body of the printing plate described above, the heating body having a cutting surface.

[0013] In one embodiment, the heating element is optically transparent.

[0014] The present invention also provides a method for producing a printmaking plate product, comprising the steps of: A step of cutting at least one surface of a molded body constituting a printing plate containing a vinyl chloride resin and a plasticizer to obtain a cut printing plate having a cut surface; heating the cut printing plate; The method includes:

[0015] In one embodiment, the step of heating the cut printing plate is performed until the cut printing plate becomes optically clear.

[0016] In one embodiment, the vinyl chloride resin has an average degree of polymerization of 650 to 5,000.

[0017] In one embodiment, the plasticizer has a solubility parameter of 8-11. Effect of the Invention

[0018] According to the present invention, even delicate designs such as small letters and thin line drawings can be easily expressed on the cutting surface. Meanwhile, the completed printing plate is robust, and even if it is used repeatedly, the possibility of the delicate designs on the cutting surface being damaged is reduced. In the present invention, the change in the cutting surface from the printing plate to the printing plate can be easily and visually determined by the presence or absence of transparency of the molded body having the cutting surface. [Brief description of the drawings]

[0019] [Figure 1] 1 is a photograph showing the change in transparency that occurs when sample plates (E1) to (E6) produced in Examples 1 to 6 are heated in a thermostatic chamber. [Diagram 2]This figure shows whether there is any change between the prints transferred from the cut surface (printing surface) of sample plates (E1) to (E6) produced in Examples 1 to 6 immediately after cutting (before heating, 0 minutes) and the prints transferred from the cut surface (printing surface) of the sample plates having the cut surface after a predetermined time has passed (after 15 minutes and 30 minutes of heating). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] The present invention will be described in detail below.

[0021] (Print board) The printing plate of the present invention is composed of a molded product containing a vinyl chloride resin and a plasticizer.

[0022] The term "printing plate" used in the present invention refers to a molded body used to prepare a printing plate, and refers to a molded body in a state before a cutting surface is provided. In contrast, the term "printing plate" used in this specification refers to the printing plate having a cutting surface on which a predetermined design (for example, letters, figures, or a combination thereof) is engraved in order to prepare a print. In addition, in this specification, a printing plate that is industrially produced on the assumption that many users will purchase and use it is also called a "printing plate product."

[0023] The vinyl chloride resin is a paste vinyl chloride resin having an average degree of polymerization of, for example, 650 to 5000, preferably 700 to 3700, and more preferably 1100 to 1500. In the present invention, when the average degree of polymerization of the vinyl chloride resin is within the above range, a good printing plate can be provided. If the average degree of polymerization of the vinyl chloride resin is below 650, the resulting printing plate becomes too soft and causes undesired deformation during heating as described below, or the resulting printing plate is also easily deformed, and the pressure applied during imprinting may cause distortion in the resulting print. If the average degree of polymerization of the vinyl chloride resin is above 5000, the molding temperature required for molding the printing plate becomes high, which may cause problems such as deterioration and discoloration of the vinyl chloride resin itself.

[0024] The vinyl chloride resin may be a homopolymer of vinyl chloride or a copolymer containing primarily vinyl chloride as a constitutional unit and also containing vinyl acetate, ethylene, methyl acrylate, methyl methacrylate, and the like as comonomers.

[0025] In the present invention, the base resin may contain other resins or rubbers in addition to the vinyl chloride resin as long as the effect of the present invention is not impaired. Examples of other resins include thermoplastic elastomers such as styrene-based thermoplastic elastomers, olefin-based thermoplastic elastomers, acrylic-based thermoplastic elastomers, PVC-based thermoplastic elastomers, polyester-based thermoplastic elastomers, polyurethane-based thermoplastic elastomers, nylon-based thermoplastic elastomers, and chlorinated polyethylene copolymer crosslinked alloys, as well as combinations thereof. Examples of other rubbers include natural rubbers and synthetic rubbers, as well as combinations thereof. Specific examples of synthetic rubbers include diene-based rubbers such as isoprene rubber, butadiene rubber, styrene butadiene rubber, chloroprene rubber, and acrylonitrile butadiene rubber, as well as combinations thereof; and non-diene-based rubbers such as butyl rubber, ethylene-propylene rubber, urethane rubber, silicone rubber, chlorosulfonated polyethylene, chlorinated polyethylene, acrylic rubber, epichlorohydrin rubber, and fluororubber, as well as combinations thereof.

[0026] In order to impart suitable transparency to the final printmaking precursor or printmaking precursor product, it is desirable for such other resins or rubbers to have a refractive index substantially equal to that of the vinyl chloride resin, i.e., a refractive index of preferably 1.44 or more, more preferably 1.50 or more, and even more preferably 1.52 to 1.55. The content of the other resins or rubbers can be appropriately selected by those skilled in the art.

[0027] The plasticizer is added to provide the resulting printing plate with appropriate flexibility and machinability, and to provide the final printing plate or printing plate product with appropriate fastness. In the present invention, the plasticizer is added to the polyvinyl chloride resin in order to reduce the refractive index (R pvc ) with a refractive index (R pl The refractive index (R pl The refractive index (R pl ) is less than 1.44, the refractive index (R pvc ) becomes larger, and the transparency that can be imparted to the final printmaking master plate or printmaking master plate product may decrease. In the present invention, in order to increase such transparency, the refractive index (R pvc ) and the refractive index of the plasticizer (R pl ) and the absolute value of the difference (|R pvc -R pl |), but for example:

[0028]

number

[0029] It is preferable to satisfy the following:

[0030] The plasticizer also has a solubility parameter (sp value) of, for example, 8 to 11, preferably 9.4 to 11, more preferably 9.5 to 10.5, and even more preferably 9.6 to 10. If the solubility parameter of the plasticizer is outside this range, compatibility with the vinyl chloride resin decreases, making it difficult to obtain a more homogeneous molded product (printing plate).

[0031] The plasticizer may be one that is generally intended to be blended with vinyl chloride resin. Specific examples of such plasticizers include benzoic acid esters, phosphoric acid esters, phthalic acid esters, citrate esters, and sulfonic acid esters, as well as combinations thereof. More specific examples of plasticizers include diethylene glycol dibenzoate, dipropylene glycol dibenzoate, triethylene glycol dibenzoate, tricresyl phosphate, trixylenyl phosphate, bis(2-ethylhexyl) phthalate, diisononyl phthalate, benzyl butyl phthalate, tributyl acetyl citrate, alkylsulfonic acid phenyl ester, bis(2-ethylhexyl) adipate, tri(2-ethylhexyl) trimellitate, and the like, as well as combinations thereof.

[0032] In the present invention, the content of the plasticizer is not necessarily limited, but is preferably 50 to 200 parts by mass, more preferably 100 to 150 parts by mass, relative to 100 parts by mass of the vinyl chloride resin. If the content of the plasticizer is less than 50 parts by mass, the resulting printing plate may become hard and / or brittle, and the pattern obtained by cutting may be easily chipped. If the content of the plasticizer is more than 200 parts by mass, the hardness of the resulting printing plate may decrease and become sticky, which may result in poor cutting ability in that it becomes difficult to engrave a delicate pattern.

[0033] The printing plate of the present invention may also contain other ingredients to the extent that they do not significantly impair the machinability and other properties achieved by the combination of the vinyl chloride resin and the plasticizer alone. Such other ingredients include, for example, stabilizers and colorants, and combinations thereof.

[0034] The stabilizer is one commonly used in the field of resin molding, and is preferably a heat stabilizer for vinyl chloride resin. Examples of heat stabilizers for vinyl chloride resin include metal soaps of metals such as barium, zinc, and calcium and organic acids such as stearic acid, lauric acid, ricinoleic acid, naphthenic acid, and 2-ethylhexanoic acid. Other examples of stabilizers include antioxidants, ultraviolet absorbers, and light stabilizers. Examples of antioxidants include hindered phenol-based antioxidants, phosphorus-based antioxidants, and sulfur-based antioxidants. Examples of ultraviolet absorbers include benzotriazole-based ultraviolet absorbers, triazine-based ultraviolet absorbers, benzophenone-based ultraviolet absorbers, cyanoacrylate-based ultraviolet absorbers, salicylate-based ultraviolet absorbers, and oxanilide-based ultraviolet absorbers. Examples of light stabilizers include various hindered amine-based light stabilizers, oxalic acid derivatives, salicylic acid derivatives, and hydrazine derivatives.

[0035] The colorant is preferably one that is generally used for polyvinyl chloride resins. Examples of the colorant include inorganic pigments, organic pigments, disperse dyes, and reactive dyes.

[0036] While the printing plate of the present invention has excellent machinability, by forming the cutting surface and then heating at an appropriate temperature as described below, a printing plate precursor having appropriate fastness at the expense of reduced machinability can be obtained. Such changes in properties relating to machinability and fastness can be visually recognized through the molded body (particularly the surface of the molded body) that constitutes the printing plate.

[0037] The mixture of the vinyl chloride resin and the plasticizer is usually optically opaque, but has the property of becoming optically transparent when heated. The printing plate of the present invention is preferably made of a molded body in an optically opaque state, and such a molded body provides excellent cutting properties. On the other hand, when the molded body is heated as described below, the molded body changes to an optically transparent state, at which point the above-mentioned fastness is imparted.

[0038] From this viewpoint, it is preferable that the molded body constituting the printing plate of the present invention does not contain a filler that can be generally used in resin moldings, because if a filler is contained in the molded body, the filler may block the transparency of the molded body, making it difficult to visually confirm the above-mentioned changes in properties.

[0039] The molded product constituting the printing plate of the present invention may have any shape, for example, a plate shape; a polygonal prism such as a square prism or a triangular prism, a cylinder, an elliptical cylinder, etc. For example, when the printing plate of the present invention is in the form of a plate, the vertical and horizontal dimensions are not particularly limited, and the thickness is, for example, 3 mm to 20 mm, preferably 5 mm to 15 mm. Since the printing plate of the present invention has such a thickness, it is possible to carve any desired pattern using various cutting tools.

[0040] The printing plate of the present invention can be produced, for example, by molding a mixture of the vinyl chloride resin, the plasticizer, and other components that may be used as required at a predetermined temperature, which is preferably melt-kneaded by any means known to those skilled in the art.

[0041] Examples of the molding include press molding, injection molding, and extrusion molding. As a specific example, the printing plate of the present invention can be manufactured by kneading the above-mentioned components in a blender to prepare a sol, degassing the sol, putting it into a mold to gel it, and then pressing it under a predetermined pressure. The temperature applied during this molding is, for example, 70°C to 150°C, preferably 90°C to 130°C. If the temperature applied during molding is lower than 70°C, the gelation of the vinyl chloride resin is insufficient, and the strength of the obtained molded body is reduced, making it difficult to remove from the mold. If the temperature applied during molding is higher than 150°C, the gelation of the vinyl chloride resin proceeds too much, and the printing plate may not have the appropriate cutting ability desired.

[0042] The time required for the molding (molding time) is not necessarily limited, but is, for example, 10 to 40 minutes. If the molding time is less than 10 minutes, gelation of the vinyl chloride resin is insufficient, and the strength of the obtained molded body may decrease, making it difficult to remove from the mold. If the molding time is more than 40 minutes, gelation of the vinyl chloride resin may proceed too much, and appropriate cutting properties desired for the printing plate may not be obtained.

[0043] After the above molding, the molded body is cooled, for example, by a means known to those skilled in the art. The molded body may be cut into an appropriate size as necessary.

[0044] In this manner, the printing plate of the present invention can be obtained.

[0045] With the printing plate of the present invention, creators from preschoolers to adults can easily carve the letters, lines and other designs they intend, regardless of their level of proficiency in printmaking, using cutting tools that are commonly used in printmaking (for example, carving knives (e.g., round knives, triangular knives, flat knives, marking knives, sword tips, etc.), design knives, utility knives, toothpicks, bamboo skewers, bamboo spatulas, pencils, mechanical pencils, etc.).

[0046] (Printmaking originals and printmaking original products) The printing plate and printing plate product of the present invention (hereinafter, these may be collectively referred to as the printing plate (product)) are composed of the above-mentioned printing plate heater. The printing plate (product) of the present invention also has a cutting surface on which an arbitrary pattern is engraved.

[0047] The heating element constituting the printing plate (product) of the present invention preferably has a suitable overall strength and has reduced machinability to the extent that it is somewhat difficult to carve with the above-mentioned cutting tools such as a carving knife, etc. This gives the printing plate (product) suitable robustness and reduces the possibility of chipping or cracking of the design applied to the cutting surface during use or storage.

[0048] The heating body constituting the printing plate precursor (product) of the present invention is also preferably optically transparent. The term "optically transparent" as used herein refers to a transparency in which, for example, when the heating body is formed into a plate shape with a thickness of 10.7 mm from the front to the back, a white document on which characters that can be visually recognized under indoor conditions (40 W white fluorescent lamp) are printed is placed on the back of the heating body so that the printed surface comes into contact with the back of the heating body, and the characters can be recognized from the surface of the heating body under indoor conditions (40 W white fluorescent lamp). In the present invention, the fact that the heating body is "optically transparent" can be an indicator of the above-mentioned robustness.

[0049] Such a printing plate (product) is produced, for example, as follows.

[0050] First, cutting is performed on at least one surface of the molded body constituting the printing plate. The cutting is performed by the creator using the above-mentioned cutting tool to carve a desired design. This produces a cut printing plate in which a cutting surface is provided on a part of the printing plate.

[0051] The cut printing plate is then heated, for example, at a temperature of 100°C to 180°C, preferably 120°C to 160°C. If the temperature applied to the cut printing plate is lower than 100°C, the resulting heated body may have low transparency and may not have sufficient robustness. If the temperature applied to the cut printing plate is higher than 180°C, the resulting heated body may melt and the cut design may be deformed.

[0052] The cutting plate is preferably heated until the cutting plate becomes optically transparent. This is because it is easy to visually confirm that the heated plate has acquired appropriate fastness. The time required for such heating (heating time) is not necessarily limited, but is, for example, 5 to 40 minutes. If the heating time is less than 5 minutes, the cutting plate does not become transparent, and as a result, a heated plate having excellent fastness may not be obtained. If the heating time exceeds 40 minutes, the obtained heated plate may melt and the cut pattern may be deformed. The cutting plate may be heated using a heating means known to those skilled in the art, such as a commercially available oven.

[0053] After the heating, the resulting heated body is cooled, for example, using means known to those skilled in the art.

[0054] In this manner, the printing plate precursor (product) of the present invention can be obtained.

[0055] The printing plate (product) of the present invention manufactured as described above can retain the pattern engraved on the cutting surface of the printing plate in a substantially intact state. In other words, the pattern engraved on the cutting surface of the cut printing plate is maintained in a substantially similar state to that before the heating operation without local or overall shrinkage, expansion, cracking, etc., caused by the heating operation for obtaining the heating body.

[0056] For this reason, the printmaking master (product) of the present invention retains the creator's design expressed on the printing plate on the heated body in almost its entirety, while the improved strength gives the printing plate appropriate robustness, significantly reducing the possibility of the printing plate's machinability decreasing and the entire printmaking master (product), including the cutting surface, chipping or cracking. EXAMPLES

[0057] The present invention will be described in detail below with reference to examples, but the present invention is not limited to these examples.

[0058] (Example 1: Preparation of sample plate (E1)) 100 parts by mass of a paste-like polyvinyl chloride resin (PQ140 manufactured by Shin-Daiichi Vinyl Corporation; average degree of polymerization 1210-1410) and 120 parts by mass of a plasticizer (PN6120 manufactured by ADEKA Corporation; benzoic acid ester-based plasticizer, refractive index 1.53, sp value 9.8) were kneaded in a blender to form a sol, which was then degassed and placed in a press molding machine and molded at 80°C for 30 minutes. The contents were then removed from the molding machine and cut into rectangles measuring 30 mm in length and 30 mm in width to obtain multiple sample plates (E1). The sample plates (E1) had a thickness of 10.7 mm at room temperature and were generally opaque beige in color. The characteristics of the obtained sample plates (E1) are shown in Table 1.

[0059] (Examples 2 to 6: Preparation of sample plates (E2) to (E6)) A plurality of sample plates (E2), (E3), (E4), (E5) and (E6) were prepared in the same manner as in Example 1, except that the types and amounts of paste-like polyvinyl chloride resin and plasticizer, as well as the molding conditions, shown in Table 1 were used. All of these sample plates (E2) to (E6) had a thickness of 10.7 mm at room temperature. The characteristics of the obtained sample plates (E2) to (E6) are shown in Table 1.

[0060] [Table 1]

[0061] (Evaluation of the ease of carving sample plates using cutting tools and transparency) Each of the sample plates (E1) to (E6) produced in Examples 1 to 6 was heated in a thermostatic chamber set to a predetermined temperature for 5 minutes, and then removed and allowed to cool at room temperature. The temperature of the thermostatic chamber was set to 140°C for sample plates (E1) to (E4), and 160°C for sample plates (E5) and (E6). Next, a straight line of about 20 mm was carved into each of the sample plates using two types of cutting tools (a toothpick and a design knife), and the feel during the carving (carving feel) was evaluated according to the following criteria: 5 points: There was almost no resistance when the cutting tool was inserted into the sample plate, making it easy to carve. 4 points: Some resistance was felt when cutting into the sample plate with the cutting tool, but it was easy to carve. 3 points: There was resistance when inserting the cutting tool into the sample plate, but the plate was still able to be carved. 2 points: There was resistance when inserting the cutting tool into the sample plate, making it difficult to carve. 1 point: The sample plate was so sticky that the cutting tool could not penetrate it and it was impossible to carve.

[0062] The results obtained are shown in Table 2.

[0063] In addition, the other sample plates (E1) to (E6) prepared in Examples 1 to 6 were heated in the same manner as above, except that the time in the thermostatic chamber was changed to 10 minutes, 15 minutes, 20 minutes, and 25 minutes, respectively, and after cooling, the carving feel was evaluated using a cutting tool. The results obtained are shown in Table 2 together with the results of the sample plates (E1) to (E6) before being placed in the thermostatic chamber (0 minutes).

[0064] [Table 2]

[0065] As shown in Table 2, all of the sample plates (E1) to (E6) produced in Examples 1 to 6 were easy to engrave and had excellent cutting properties before being placed in the thermostatic bath (0 minutes). In contrast, the longer the sample plates were placed in the thermostatic bath (for example, 20 minutes or 25 minutes), the more difficult they became to engrave and the more their cutting properties were lost. This shows that the sample plates (E1) to (E6) produced in Examples 1 to 6 can be used as printing plates with excellent cutting properties before being placed in the thermostatic bath and heated, and that by heating in the thermostatic bath, they can acquire the excellent robustness desired for printing original plates.

[0066] In addition, sample plates (E1) to (E6) were placed on a paper printed with a checkered pattern consisting of white and dark gray, under indoor (40W white fluorescent lamp) and photographed before (0 min) and after (5 min, 10 min, 15 min, 20 min, and 25 min) heating in the thermostatic chamber. The results are shown in Figure 1.

[0067] As shown in FIG. 1, the transparency of all of the sample plates (E1) to (E6) produced in Examples 1 to 6 increased the longer they were placed in the thermostatic chamber, and the checkered pattern on the back surface became more clearly visible.

[0068] (Evaluation of the cutting surface (print surface) of the sample board using a cutting tool) A cut surface (print surface) was created on each of the sample plates (E1) to (E6) produced in Examples 1 to 6 by carving a circle with a toothpick, a rectangle with a design knife, a thin straight line with a triangular knife, and a thick straight line with a round knife. The cut surface (print surface) thus obtained was pressed against an ink pad (Versa Craft Real Black, manufactured by Tsukineko Co., Ltd.) and imprinted on white paper to obtain a print. The state of this print was photographed. The results are shown in FIG. 2.

[0069] Thereafter, the sample plates (E1) to (E6) on which these cut surfaces (printing surfaces) were formed were placed in a thermostatic bath at 140°C and heated (for 15 minutes), after which the cut surfaces (printing surfaces) of the obtained sample plates (E1) to (E6) were pressed against an ink tray in the same manner as above and imprinted onto white paper to obtain prints. After further heating for 15 minutes in the same manner (equivalent to a cumulative heating time of 30 minutes), the plates were pressed against an ink tray in the same manner as above and imprinted onto white paper to obtain prints. These prints were arranged in order of heating time as shown in Figure 2.

[0070] As shown in Fig. 2, no significant changes were observed in the patterns represented by the prints obtained using the cut surfaces (print surfaces) of the sample plates (E1) to (E6) produced in Examples 1 to 6 before (0 min) and after (15 min and 30 min) they were placed in the thermostatic bath. This shows that the patterns of the cut surfaces (print surfaces) of the sample plates (E1) to (E6) produced in Examples 1 to 6 were not affected by heating, regardless of whether they were heated in a thermostatic bath or not.

[0071] (summary) Taking the results of Table 2 and Figures 1 and 2 together, it can be seen that the sample plates (E1) to (E6) prepared in Examples 1 to 6 were suitable as printing plates that were easy to engrave and had excellent machinability before being heated in a thermostatic bath. Furthermore, by heating in a thermostatic bath, the machinability was lost but the plate became excellent in durability, and this state could be determined by the appearance of transparency on the sample plate surface. Furthermore, since there was no significant change in the cut surface as a printing surface before and after such heating, it can be seen that all of the sample plates (E1) to (E6) after heating in a thermostatic bath were usable as excellent original printing plates.

Claims

1. A printing plate for obtaining a printing plate product by heating after cutting out a pattern, comprising: The molded body is made of a mixture of a vinyl chloride resin having an average degree of polymerization of 650 to 5000 and a plasticizer having a solubility parameter of 8 to 11, The mixture has a property of changing from opaque to transparent through the heating.

2. A printing board as described in claim 1, wherein the properties of the mixture are used as an indicator of the cuttability and durability of the printing board.

3. 3. The printing plate of claim 1, wherein the plasticizer is at least one compound selected from the group consisting of benzoates, phosphates, phthalates, citrates, and sulfonates.

4. 4. A printing plate according to claim 1, wherein the shaped body does not contain a filler.

5. 5. A printing plate according to claim 1, wherein the body is optically opaque.

6. A method for producing a printing plate as described in any one of claims 1 to 5, comprising a step of molding a mixture of polyvinyl chloride resin having an average degree of polymerization of 650 to 5000 and a plasticizer having a solubility parameter of 8 to 11 to obtain a molded body.

7. 6. A printing plate precursor product comprising a heating element of the printing plate according to any one of claims 1 to 5, said heating element having a cutting surface.

8. 8. The print precursor product of claim 7, wherein said heater element is optically transparent.

9. A method for producing a printmaking master product, comprising the steps of: A step of cutting at least one surface of the molded body constituting the printing plate according to any one of claims 1 to 5 to obtain a cut printing plate having a cut surface; heating the cut printing plate; A method comprising:

10. 10. The method of claim 9, wherein the step of heating the cut printing plate is performed until the cut printing plate becomes transparent.

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