JP4847066B2 - Manufacturing method of stamp materials - Google Patents

Description

The present invention relates to a method for manufacturing a printing material that is made of a porous resin body and is used for imprinting with ink on a imprinting surface by pressing.

Conventionally, as this type of stamping material, a porous stamping material having a stamping surface layer with protruding characters on the surface and an ink absorption holding layer on the back side of the stamping layer is known (for example, Patent Documents). 1). The stamp material has a plurality of ink supply holes formed by laser light on the surface of the stamp surface layer. Further, the stamp layer includes a surface layer and an ink adjustment layer, which are integrally formed and laminated with the ink absorption holding layer.
Japanese Unexamined Patent Publication No. 2000-212226 (pages 2 and 4)

  However, since the stamp material described in Patent Document 1 is formed by laminating the stamp surface layer and the ink absorption holding layer separately, an adhesive or the like for joining the two layers is required. In this case, there is a problem that the ink absorbed in the ink absorption holding layer is blocked by the adhesive layer, and the ink cannot smoothly penetrate into the printing surface layer. Furthermore, since a plurality of ink replenishing holes are provided in the printing surface layer and the ink reaches the printing surface (imprinting surface) through the ink replenishing holes, there is a possibility that the ink permeation becomes uneven.

The present invention has been made paying attention to such problems of the prior art. The object of the present invention is to sufficiently hold the ink and to uniformly and smoothly infiltrate the ink onto the stamping surface. Another object of the present invention is to provide a method for manufacturing a printing material.

In order to achieve the above-mentioned object, the manufacturing method of the stamping material according to claim 1 is characterized in that the stamping surface portion having the stamping surface and the ink holding portion that holds the ink and supplies it to the stamping surface portion are made of a resin porous body. In a method for producing an integrally formed printing material, a raw material for a printing surface part containing a thermoplastic resin and a water-soluble bubble forming material, and a raw material for an ink holding part containing a thermoplastic resin and a water-soluble bubble forming material are heated and melted. A first step of obtaining an extruded product that is integrated in a sheet by extrusion molding in a state where both raw materials heated and melted are laminated, and the water-soluble foam-forming material contained in the extruded product with water A second step of extracting and removing, and setting an average particle diameter of the water-soluble bubble forming material contained in the stamp face portion raw material to 5 μm or more and less than 50 μm, and being contained in the ink holding portion raw material The water-soluble gas The average particle diameter of the foam-forming material is set to 50 μm or more and 250 μm or less, and the ratio of the thermoplastic resin in the stamp face part raw material is larger than the ratio of the thermoplastic resin in the ink holding part raw material. It is characterized by setting as follows.

According to a second aspect of the present invention, there is provided a printing material manufacturing method according to the first aspect , wherein in the first step, the first extruder to which the raw material for the printing surface is supplied and the raw material for the ink holding unit are provided. Of the stamp face portion raw material extruded from the first extruder and the ink holding portion raw material extruded from the second extruder, using an extrusion molding apparatus connected to a second extruder supplied with A sheet-like extruded product is extruded with the thickness of each layer based on each extrusion amount .

According to the present invention, the following effects can be exhibited.
The stamp material manufactured by the manufacturing method of the stamp material according to the first aspect of the present invention is configured such that a stamp surface portion having a stamp surface and an ink holding portion that holds ink and supplies it to the stamp surface portion are integrally formed of a porous resin body. Has been. For this reason, it is possible to omit the bonding by an adhesive layer or the like between the marking surface portion and the ink holding portion, and it is possible to uniformly and smoothly permeate the ink from the ink holding portion to the marking surface portion and further to the stamping surface. I can .

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
As shown in FIG. 1, the stamp member 10 has a stamping member 12 accommodated in a holder 11 having a substantially covered cylindrical shape, and a male screw portion 11 b provided in a protruding portion 11 a at the center of the upper end of the holder 11 having a spherical shape. A female screw portion 13a of the body 13 is screwed together. The marking material 12 shown in FIG.1 and FIG.2 is comprised by the marking surface part 15 into which the lower surface became the stamping surface 14, and the ink holding | maintenance part 16 which hold | maintains ink and supplies it to the marking surface part 15, and these are resin porous bodies. It is constructed integrally.

  The resin porous body of the marking surface portion 15 is set to have an average cell diameter of 5 μm or more and less than 50 μm, and the resin porous body of the ink holding portion 16 is set to have an average cell diameter of 50 μm or more and 250 μm or less. Thus, by setting the average cell diameter of the porous resin body to be large at the ink holding portion 16 and small at the marking surface portion 15, the ink holding amount can be secured in the ink holding portion 16, and the ink in the marking surface portion 15. Therefore, an appropriate ink penetration amount can be obtained. Here, the average cell diameter corresponds to, for example, the value of the average particle diameter of a water-soluble bubble forming material (powder) described later.

  When the average cell diameter of the marking surface portion 15 is less than 5 μm, the ink flow in the marking surface portion 15 is extremely suppressed, and the function of the marking surface portion 15 cannot be achieved. On the other hand, if the average cell diameter exceeds 50 μm, the amount of ink permeating through the marking surface portion 15 becomes too large, causing ink leakage from the marking surface 14. When the average cell diameter of the ink holding unit 16 is less than 50 μm, the amount of ink supplied from the ink holding unit 16 to the printing surface portion 15 is insufficient, and ink shortage occurs in the printing surface portion 15. On the other hand, when the thickness exceeds 250 μm, the ink holding unit 16 does not hold the ink sufficiently, the ink is excessively supplied to the stamping surface 15, and ink leakage occurs from the stamping surface 14 of the stamping surface 15.

  Furthermore, the porosity of the stamp face portion 15 is set to 62% or more and less than 75%, and the ink holding portion is set to a porosity of 75% or more and 85% or less. Thus, by setting the porosity of the resin porous body to be large at the ink holding portion 16 and to be small at the marking surface portion 15, the ink holding portion 16 combines ink with the average cell diameter of the resin porous body. Can be secured, and an appropriate ink permeation amount can be obtained at the stamping surface portion 15. Here, the porosity (%) corresponds to, for example, the ratio of water-soluble components such as a water-soluble bubble forming material and a water-soluble polymer compound in a material for a printing surface portion or a material for an ink holding portion described later.

  When the porosity of the marking surface portion 15 is less than 62%, the ink flow in the marking surface portion 15 is insufficient, and the function of the marking surface portion 15 cannot be achieved. On the other hand, when the porosity is 75% or more, the amount of ink permeating through the stamping surface portion 15 becomes excessive, causing ink leakage from the stamping surface 14. Further, when the porosity of the ink holding unit 16 is less than 75%, the amount of ink supplied from the ink holding unit 16 to the printing surface portion 15 is small, and ink shortage occurs in the printing surface portion 15. On the other hand, when the porosity exceeds 85%, an excessive amount of ink is not held by the ink holding unit 16 and flows to the marking surface portion 15, and ink leakage occurs from the stamping surface 14 of the marking surface portion 15.

  In addition, the hardness of the printing material 12 is set so that the printing surface portion 15 is harder than the ink holding portion 16 from the viewpoints of ink permeability and retention, clearness of the marking on the marking surface 14, and feel at the time of stamping. It is preferable to do. Specifically, the Asker C hardness is preferably 40 or more and 60 or less in the marking surface portion 15, and the Asker C hardness is preferably 5 or more and less than 40 in the ink holding portion 16. This hardness basically depends largely on the physical property values of the thermoplastic resin itself that forms the skeleton of the printing surface portion 15 and the ink holding portion 16, so that an appropriate thermoplastic resin is selected according to the intended printing material 12. Is done. Here, Asker C hardness represents the hardness measured by a hardness meter (a kind of durometer hardness meter which is a spring type hardness meter) defined in SRIS0101 (Japan Rubber Association Standard).

  When the Asker C hardness at the marking surface 15 is less than 40, the marking surface 15 becomes soft, the deformation amount at the time of stamping is large, and the ink oozes out excessively, which is not preferable. On the other hand, when the Asker C hardness exceeds 60, the marking surface portion 15 becomes hard and the ink seepage deteriorates, and the sharpness of the marking on the marking surface 14 is lowered. In addition, when the Asker C hardness at the ink holding unit 16 is less than 5, it is not preferable because the strength of the ink holding unit 16 is insufficient. On the other hand, when the Asker C hardness is 40 or more, the ink holding portion 16 becomes too hard and the ink permeability is deteriorated.

  The ratio of the thickness of the marking surface portion 15 to the ink holding portion 16 is determined from the balance of the amount of ink retained and exuded in the marking surface portion 15 and the amount of ink retained in the ink retaining portion 16, but 1: It is preferable to set to around 2.

  The printing material 12 of the present embodiment is preferably a method of manufacturing by combining the following extrusion process and extraction process. That is, the extrusion surface raw material is extruded at a predetermined flow rate in the extrusion molding process, and the ink holding portion raw material is extruded at a predetermined flow rate and integrated by extrusion molding, and then the extrusion molded product is immersed in water in the extraction step. It is obtained by extracting and removing water-soluble components such as a water-soluble bubble forming material and a water-soluble polymer compound, and drying. A thermoplastic resin, a water-soluble bubble-forming material, a water-soluble polymer compound, and a functional substance as required are used as the stamp surface material and the ink holding material.

  Explaining about the extrusion molding apparatus used in the extrusion molding step, as shown in FIG. 3, a first extruder 17 for extruding a molten stamping material is connected to the extrusion molding apparatus 18, A second extruder 19 for extruding the molten ink holding material is connected to the extrusion molding device 18. In the extrusion molding apparatus 18, a sheet-like extrusion molding is performed with the thickness of each layer based on the extrusion amount of the stamping material raw material extruded from the first extruder 17 and the ink holding material raw material extruded from the second extruder 19. Article 20 is extruded. In the extrusion molding apparatus 18, extrusion molding is performed under a temperature condition of, for example, 130 to 150 ° C.

  As the thermoplastic resin that becomes the skeleton of the porous resin body, thermoplastic elastomer (TPE), olefin resin, or the like is used. As thermoplastic elastomers, polyester polyurethane, polyether polyurethane, polyether ester polyurethane, polystyrene elastomer, polyamide elastomer, polyolefin thermoplastic elastomer (TPO), chlorinated polyethylene thermoplastic elastomer (T-CM) Etc. Examples of the olefin resin include low density polyethylene (LDPE), high density polyethylene (HDPE), linear low density polyethylene (LLDPE), and polypropylene (PP).

  Any water-soluble foam-forming material can be used as long as it is soluble in water and is thermally stable even when the thermoplastic resin is melted by heat. By using this water-soluble cell forming material, when the extruded product 20 is immersed in water, the water-soluble cell forming material dissolves in water and dissolves to form cells. Therefore, the average particle diameter of the water-soluble bubble forming material substantially corresponds to the average cell diameter of the cells. Therefore, the average particle diameter of the water-soluble bubble forming material is preferably 5 μm or more and less than 50 μm when the stamp surface portion 15 is formed, and 50 μm or more and 250 μm or less when the ink holding portion 16 is formed. Such a water-soluble bubble forming material is such that the removal traces become bubbles (cells) as they are, and by setting the particle size of the water-soluble bubble forming material to a desired value, the marking surface portion 15 and the ink holding portion. 16, the average cell diameter (average bubble diameter) can be easily controlled.

Examples of the water-soluble foam-forming material include inorganic substances such as sodium nitrate (NaNO ₃ ), potassium chloride (KCl), calcium chloride (CaCl ₂ ), ammonium chloride (NH ₄ Cl), sodium chloride (NaCl), sodium nitrite ( NaNO ₂ ) and the like. Examples of organic substances include trimethylolethane (TME), trimethylolpropane, trimethylolbutane, sucrose, soluble starch, sorbitol, glycine, or sodium salts of organic acids (malic acid, citric acid, glutamic acid, or succinic acid). .

  Next, the water-soluble polymer compound is a component that dissolves in water and lowers the viscosity of the thermoplastic resin. Examples of the water-soluble polymer compound include polyethylene glycol derivatives such as polyethylene glycol diacrylate, polyethylene glycol dioleate, polyethylene glycol, and polyethylene glycol diacetate. In addition, any compound that dissolves in water and functions to lower the viscosity of the thermoplastic resin can be used.

  Examples of the functional substance include a coloring substance, a fluorescent substance, a shaping substance, an antibacterial substance, a deodorizing substance, and the like, which are appropriately selected according to the function to be expressed. As the shape, any shape can be used as long as it can be mixed in the thermoplastic resin, but it is preferably in the form of powder or fiber in order to be integrated into a sheet by an extrusion method. It is.

  In the extraction step, the water-soluble bubble forming material dispersed in the extruded product 20 is extracted and removed by contacting with water as a solvent for a predetermined time. In this case, the most efficient method is to immerse the entire extruded product 20 in water. The immersion time in water depends on the shape, thickness, and the like of the extruded product 20, but is set to 24 to 48 hours, for example. Moreover, it does not specifically limit about the temperature of water, Although it may be about room temperature, in order to remove the said water-soluble bubble formation material efficiently, you may utilize 30-60 degreeC warm water.

  The blending ratio of the thermoplastic resin and other components is preferably such that the content of the thermoplastic resin in the stamp face part raw material is 25% by volume or more and 38% by volume or less. The thermoplastic resin content is preferably 15% by volume or more and less than 25% by volume. Accordingly, the content of other components is preferably 62% by volume or more and 75% by volume or less in the raw material for the stamp face part, and more than 75% by volume and 85% by volume or less in the raw material for the ink holding part. . In this case, by setting the ratio of the thermoplastic resin that forms the skeleton of the marking surface portion 15 to be larger than the ratio of the thermoplastic resin that forms the skeleton of the ink holding portion 16, the porosity at the marking surface portion 15 is set to the ink. It can be made smaller than the porosity in the holding part 16. When the content of the thermoplastic resin in the raw material for the stamp face is less than 25% by volume, the ratio of the thermoplastic resin serving as the skeleton becomes too small to obtain the required strength. On the other hand, when the volume exceeds 38% by volume, the ratio of the thermoplastic resin is large, and the formation of the cells is insufficient and the ink permeability is lowered. In addition, when the content of the thermoplastic resin in the ink holding portion raw material is less than 15% by volume, the ratio of the cells to be communicated increases, and the ink permeability tends to be too high, which is not preferable. On the other hand, when the content is 25% by volume or more, the ratio of the thermoplastic resin forming the skeleton is large, and the formation of cells is hindered.

  The content of the water-soluble bubble forming material is preferably 25 to 80% by volume, and more preferably 50 to 70% by volume. In this case, in order to satisfy the void ratio in the marking surface portion 15 and the ink holding portion 16, the content of the water-soluble bubble forming material in the marking surface portion 15 is equal to or less than the content of the water-soluble bubble forming material in the ink holding portion 16. It is preferable to set to. If the content of the water-soluble bubble forming material is less than 25% by volume, not only is it difficult to obtain a three-dimensionally connected porous structure, but the water-soluble bubble forming material is covered with a thermoplastic resin and extracted and removed. It becomes difficult to be done. On the other hand, if it exceeds 80% by volume, the moldability tends to decrease.

  Furthermore, the content of the water-soluble polymer compound is preferably 10 to 25% by volume. When the content of the water-soluble polymer compound is less than 10% by volume, the slip of the thermoplastic resin is deteriorated, resulting in a decrease in moldability. When the content exceeds 25% by volume, the water-soluble polymer compound is reduced. Since it becomes excessive, the viscosity of the mixture decreases during heating, and the molding tends to be difficult.

  In order to sufficiently integrate the stamp face portion raw material and the ink holding portion raw material by extrusion molding under heating, it is preferable that the stamp face portion raw material and the ink holding portion raw material exhibit compatibility. Specifically, it is preferable that the difference in the solubility parameter of the thermoplastic resin, which is the main raw material for the stamp face portion material and the ink holding portion raw material, is 1.0 or less. If the difference in solubility parameter exceeds 1.0, surface bonding by lamination is performed only by physical phenomena such as an anchor effect by heating and melting, and a state in which the bonding is not sufficiently performed, that is, a state where peeling easily occurs. It is in.

  Here, the solubility parameter (δ value) is a value calculated from the molecular structure and density of the compound based on the molecular attraction constant of the substituent of the compound (“Adhesion Chemistry and Actuality”, pages 21 to 26, by H. Keiun. , 1962, Polymer publication society). The molecular attraction constant is described in Journal of Applied Chemistry (Vol. 3, pages 71 to 80, 1953) by PS Small.

  Now, the operation of the present embodiment will be described. In the stamping material 12, a stamping surface portion 15 having a stamping surface 14 and an ink holding portion 16 are integrally formed of a porous resin body. That is, the porous resin body is formed by extruding the stamp face portion material and the ink holding portion material and integrating them so that the boundary portion thereof disappears. For this reason, cells are formed beyond the boundary surface, and a three-dimensional open cell structure is obtained. Accordingly, there is no need for bonding with an adhesive layer or the like between the marking surface portion 15 and the ink holding portion 16 as in the prior art, and the ink smoothly penetrates from the ink holding portion 16 to the marking surface portion 15 and further to the stamping surface 14. . In addition, since the average cell diameter and the porosity of the marking surface portion 15 are set to be smaller than the average cell diameter and the porosity of the ink holding portion 16, the ink holding portion 16 can sufficiently hold the ink, The surface portion 15 can suppress the flow of ink.

The effects exhibited by the above embodiment will be described collectively below.
In the printing material 12 in the present embodiment, the marking surface portion 15 having the marking surface 14 and the ink holding portion 16 that holds the ink and supplies the ink to the marking surface portion 15 are integrally configured by a porous resin body. For this reason, the ink can be uniformly and smoothly permeated from the ink holding portion 16 to the marking surface portion 15 and further to the marking surface 14. Further, the marking surface portion 15 has an average cell diameter of 5 μm or more and less than 50 μm, and the ink holding portion 16 has an average cell diameter of 50 μm or more and 250 μm or less. Further, the porosity of the stamping surface portion 15 is set to 62% or more and less than 75%, and the ink holding portion 16 is set to a porosity of 75% or more and 85% or less. Accordingly, the ink holding unit 16 can sufficiently hold the ink, and the printing surface unit 15 can suppress an ink flow and obtain an appropriate ink penetration amount.

  The marking surface portion 15 has an Asker C hardness of 40 or more and 50 or less, and the ink holding portion 16 has an Asker C hardness of 5 or more and less than 40. Therefore, the marking surface portion 15 has a hardness suitable for stamping, and the ink holding portion 16 can exhibit a hardness suitable for ink holding.

  In the printing material 12 of the present embodiment, the printing surface portion 15 and the ink holding portion 16 are integrally manufactured through the extrusion molding process and the extraction process. Compared with the method of laminating without using an agent and mechanically fixing with a holder or the like, the number of assembly steps can be reduced, and the production efficiency can be improved.

Hereinafter, the embodiment will be described more specifically with reference to examples and comparative examples, but the present invention is not limited to these examples.
(Examples 1-3)
The stamp 12 was manufactured using the manufacturing apparatus shown in FIG. Polyether-based polyurethane was used as a raw material thermoplastic resin for forming the stamp face portion 15 and the ink holding portion 16. Therefore, the difference in solubility parameter of the thermoplastic resin forming the stamp face portion 15 and the ink holding portion 16 was zero. NaCl was used as the water-soluble foam forming material, and polyethylene glycol diacrylate was used as the water-soluble polymer compound. And each raw material which forms the stamping surface part 15 and the ink holding | maintenance part 16 with the compounding quantity (mass part) shown in Table 1 was prepared. The average particle diameter (μm) of NaCl is also shown in Table 1.

そして、印面部用原料を第１押出機１７に供給し、インク保持部用原料を第２押出機１９に供給し、押出成形装置１８で１４０℃の温度にて常法に従って押出成形を行い、インク保持部１６の厚さが４ｍｍ、印面部１５の厚さが２ｍｍのシート状をなす押出成形品２０を得た。

And the raw material for the stamp face is supplied to the first extruder 17, the raw material for the ink holding part is supplied to the second extruder 19, and the extrusion molding device 18 performs extrusion molding at a temperature of 140 ° C. according to a conventional method. An extruded product 20 having a sheet shape in which the thickness of the ink holding portion 16 was 4 mm and the thickness of the stamp face portion 15 was 2 mm was obtained.

  The obtained extruded product 20 was immersed in water for 24 hours. As a result, NaCl and polyethylene glycol diacrylate, which are water-soluble bubble forming materials in the extrusion-molded product 20, were eluted into water, and a large number of cells were formed. By drying this, a printing material 12 made of the intended porous resin body was obtained. The average cell diameter, porosity and hardness of the obtained stamp 12 were measured by the methods shown below, and the results are shown in Table 1.

Average cell diameter (μm): The average particle diameter of the water-soluble cell forming material was taken as the average cell diameter of the stamp.
Porosity (%): The mixing ratio of the water-soluble component composed of the water-soluble bubble forming material and the water-soluble polymer compound was defined as the porosity.

Hardness (Asker C hardness): Indicates hardness measured by a hardness meter defined in SRIS0101 (Japan Rubber Association Standard).
When the stamping material 12 manufactured as described above was accommodated in the holder 11 shown in FIG. 1 and impregnated with ink, the stamping operation was repeated. As a result, the stamping surface 14 was successfully stamped. In addition, sufficient ink is held in the ink holding portion 16, and the ink is guided to the marking surface portion 15, so that the ink can be imprinted without being discharged even in repeated imprinting operations.
(Examples 4 and 5)
A printing material was produced in the same manner as in Example 1, except that low density polyethylene was used as the thermoplastic resin, and the average particle diameter of NaCl, the porosity, and the blending amount of each component were changed as shown in Table 2. Therefore, the difference in solubility parameter of the thermoplastic resin forming the stamp face portion 15 and the ink holding portion 16 was zero. And the average cell diameter of the obtained stamping material 12, the porosity, and hardness were measured by the method similar to Example 1, and those results were shown in Table 2.

表２に示したように、実施例４及び５では印面部１５の平均セル径が２０〜４０μｍ、空隙率が７０〜７５％であり、インク保持部１６の平均セル径が１００〜２００μｍ、空隙率が７５〜８０％であることから、印材１２の押印状態が良好で、押印操作を繰り返してもインクの補充が十分で良好な押印状態が維持された。
（比較例１及び２）
比較例１では、実施例１において、平均粒子径の異なるＮａＣｌを用い、印材の平均セル径及びアスカーＣ硬度を変えた以外は、実施例１と同様にして印材を製造した。また、比較例２では、実施例２において、平均粒子径の異なるＮａＣｌを用い、印材の平均セル径及びアスカーＣ硬度を変えた以外は、実施例１と同様にして印材を製造した。そして、得られた印材の平均セル径及び硬さを実施例１と同様の方法で測定し、それらの結果を表３に示した。

As shown in Table 2, in Examples 4 and 5, the marking cell portion 15 has an average cell diameter of 20 to 40 μm and a porosity of 70 to 75%, and the ink holding portion 16 has an average cell diameter of 100 to 200 μm and a void. Since the rate was 75 to 80%, the stamping state of the stamping material 12 was good, and even when the stamping operation was repeated, the ink was sufficiently replenished and the good stamping state was maintained.
(Comparative Examples 1 and 2)
In Comparative Example 1, a printing material was produced in the same manner as in Example 1 except that NaCl having a different average particle diameter was used and the average cell diameter and Asker C hardness of the printing material were changed. In Comparative Example 2, a printing material was produced in the same manner as in Example 1 except that NaCl having a different average particle diameter was used and the average cell diameter and Asker C hardness of the printing material were changed. And the average cell diameter and hardness of the obtained stamp were measured by the method similar to Example 1, and those results were shown in Table 3.

表３に示したように、比較例１では印面部及びインク保持部の平均セル径が小さいことから、インクの浸透量が少なく印材の押印状態が不良で、押印操作を繰り返してもインクの補充がなされなかった。さらに、比較例２では印面部及びインク保持部の平均セル径が大きいことから、インクの浸透量が多く印材の押印時にインク漏れが生じ、押印操作を繰り返してもインクの漏れが止まらなかった。

As shown in Table 3, in Comparative Example 1, since the average cell diameter of the printing surface portion and the ink holding portion is small, the amount of ink permeation is small, the stamping state of the printing material is poor, and the ink is replenished even if the stamping operation is repeated. Was not done. Further, in Comparative Example 2, since the average cell diameter of the printing surface portion and the ink holding portion was large, the ink penetration amount was large, and ink leakage occurred when the printing material was imprinted. Even if the imprinting operation was repeated, the ink leakage did not stop.

It should be noted that the present embodiment can be implemented with the following modifications.
It is also possible to form the marking surface portion 15 or the ink holding portion 16 with a plurality of layers having different average cell diameters or porosity. In this case, the stamp face 15 or the ink holding part 16 can be made more suitable for the purpose.

  A method for producing a printing material by forming a sheet for a printing surface part and a sheet for an ink holding part, respectively, and laminating and integrating them by a hot press molding method, and then extracting and removing water-soluble components such as a water-soluble bubble forming material. Can also be adopted.

Further, the technical idea that can be grasped from the embodiment will be described below.
(1) The porous resin body is obtained by heating and melting at least a raw material for a printing surface part containing a thermoplastic resin and a water-soluble bubble forming material, and an ink holding part raw material containing at least a thermoplastic resin and a water-soluble bubble forming material. , after integrated into a sheet by extrusion molding, you characterized in that is obtained by extracting and removing at least a water-soluble foaming material by water mark material. In such a configuration, by melting a raw material for the ink holding portion indicia surface, it is possible to obtain a porous resin body in a simple way of performing an extraction operation after extrusion.

(2) The content of the water-soluble bubble forming material is set so that the content of the water-soluble bubble forming material in the marking surface portion is equal to or less than the content of the water-soluble bubble forming material in the ink holding portion. to that mark material. In this case, the porosity of the indicia surface portion can be smaller than the porosity in the ink retaining portion.

(3) a sign material you wherein a difference in solubility parameter of the thermoplastic resin in the raw material and the ink retaining portion for feedstock wherein the seal face part is 1.0 or less. In this case, it is possible to perform integration of a sign face and the ink retaining portion more fully.

Sectional drawing which shows the stamp member in embodiment. The perspective view which cuts and shows a printing material partially. Schematic explanatory drawing which shows the extrusion molding apparatus for manufacturing a printing material.

Explanation of symbols

  12 ... stamping material, 14 ... stamping surface, 15 ... marking surface portion, 16 ... ink holding portion.

Claims (2)

In the manufacturing method of the stamping material in which the stamping surface portion having the stamping surface and the ink holding portion that holds the ink and supplies the ink to the stamping surface portion are integrally formed of the porous resin body
In a state where the raw material for the printing surface part containing the thermoplastic resin and the water-soluble bubble forming material and the raw material for the ink holding part containing the thermoplastic resin and the water-soluble bubble forming material are heated and melted, and both the heated and melted raw materials are laminated. A first step of obtaining an extrusion-molded product integrated into a sheet by extrusion molding;
A second step of extracting and removing the water-soluble foam-forming material contained in the extruded product with water,
The average particle diameter of the water-soluble bubble forming material contained in the stamp face material is set to 5 μm or more and less than 50 μm, and the average particle size of the water-soluble bubble forming material contained in the ink holding part material. Is set to 50 μm or more and 250 μm or less,
Method for producing a stamp material, wherein a ratio of the thermoplastic resin in the seal face portion for the raw material is set to be larger than the ratio of the thermoplastic resin in the ink retaining portion for the raw material. In the first step, an extrusion molding apparatus in which a first extruder to which the stamp face raw material is supplied and a second extruder to which the ink holding raw material is supplied is used,
A sheet-like extruded product is extruded with the thickness of each layer based on the amount of extrusion of the printing surface raw material extruded from the first extruder and the ink holding raw material extruded from the second extruder. printing material manufacturing method according to claim 1, characterized in that.

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