JP2000079648A - Thermosensible adhesive paper for three-dimensional molding machine and three-dimensional molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermosensible adhesive paper which can be used appropriately for a heat adhesion type three-dimensional molding machine. SOLUTION: In the thermosensible adhesive paper to be used for a three- dimensional molding machine for obtaining a three-dimensional molding by a process in which thermosensible adhesive paper 31 with a thermosensible adhesive layer formed on the back is supplied in turn to the upper surface of a vertically movable base 32, the surface of the supplied adhesive paper is heated while being pressed to be adhered to the base or the surface of the already supplied adhesive paper, cutting lines 41, 42, 43 of a prescribed shape are formed in the adhesive paper, a laminate 44 comprising a plurality of layers is formed, and an unnecessary part is removed from the laminate, the thermosensible adhesive layer 50-150 deg.C in melting temperature is formed on the back of base paper 40-200 g/m2 in basis weight to be 5-30 g/m2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-sensitive adhesive paper used for a heat bonding type three-dimensional printing machine, and a three-dimensional printed article obtained by using the same.

[0002]

2. Description of the Related Art Conventionally, when designing various parts for automobiles, parts for home electric appliances, various toys, etc., a three-dimensional model (three-dimensional molded article) is manufactured using clay, wood, metal, or the like. That was being done. In addition, a three-dimensional molded article was manufactured using wood or the like, and a casting was manufactured by a method in which a mold was manufactured using sand or the like based on the three-dimensional molded article, and a molten metal was poured into the mold and cooled and solidified. .

Recently, with the development of computer technology, various methods for automatically producing these three-dimensional objects have been proposed. For example, a method of producing a three-dimensional structure using an ultraviolet curable resin has been proposed. In this method, the bat is filled with a liquid ultraviolet-curing resin, the stage placed at the bottom is raised, the resin on the stage is irradiated with ultraviolet rays to cure the resin, the stage is lowered, and then raised again to emit the ultraviolet rays. This is a method of obtaining a three-dimensional structure by repeating irradiation. A method of obtaining a three-dimensional structure by laminating the resin while melting the resin has also been proposed.

Japanese Patent Application Laid-Open No. 9-66565 discloses that a heat-sensitive adhesive sheet having a heat-sensitive adhesive layer provided on the back surface is sequentially supplied to the upper surface of a vertically movable table, as will be described in detail later. The paper is heated while being pressed while being adhered to the table or the surface of the already supplied heat-sensitive adhesive sheet, and a cut line of a predetermined shape is provided on these heat-sensitive adhesive sheets to form a laminate composed of a plurality of layers. However, there has been proposed a method of manufacturing a three-dimensional structure by removing unnecessary portions from the laminate.

[0005]

Disadvantages common to the above-mentioned method of obtaining a three-dimensional object by using a resin are that the accuracy of the object is poor and that the processing when the object becomes unnecessary is problematic. It is to become. The method using the heat-sensitive adhesive sheet described in JP-A-9-66565 is higher in accuracy than the method using a resin, and when a heat-sensitive adhesive paper is used as the heat-sensitive adhesive sheet, it is compared with a molded article using a resin. However, there is an advantage that the incineration treatment is easy, but there is a drawback that a long time is required for molding due to poor heat bonding efficiency of the heat-sensitive adhesive paper. JP-A-9-66565 does not disclose any means for solving this drawback. It is an object of the present invention to develop a heat-sensitive adhesive paper having good heat bonding efficiency, which can be suitably used for the three-dimensional molding machine.

[0006]

According to the present invention, a heat-sensitive adhesive paper provided with a heat-sensitive adhesive layer on a back surface is sequentially supplied to an upper surface of a vertically movable table, and the surface of the supplied heat-sensitive adhesive paper is pressed. While heating to adhere to the table or the surface of the already supplied heat-sensitive adhesive paper, a cut line of a predetermined shape is provided on the heat-sensitive adhesive paper to form a laminate composed of a plurality of layers. In a heat-sensitive adhesive paper used for a three-dimensional printing machine that obtains a three-dimensional printing object by removing an unnecessary portion from a paper, a heat-sensitive adhesive layer having a melting temperature of 50 to 150 ° C. is formed on a base material having a basis weight of 40 to 200 g / m ² . 5-30 g / m on back of paper
^This is a heat-sensitive adhesive paper for three-dimensional printing machines characterized by ^two features.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for using a heat-sensitive adhesive paper for three-dimensional printing according to the present invention will be described with reference to an example of a three-dimensional printing machine. FIG. 1 is a configuration diagram showing a state in which a three-dimensional molding machine described in FIG. 7 of the above-mentioned Japanese Patent Application Laid-Open No. 9-66565 is producing a molded object. In FIG. 1, reference numeral 32 denotes a vertically movable table, on which a material (heat-sensitive adhesive paper) 31 is sequentially fed from a supply roll 33 via a guide roll 34. 35 is front and back on the base 32 (left and right in the figure)
The material 31 is fed to the base 32 or heated by pressing the material 31 onto the base 32 while pressing the material 31 toward the base 32, thereby bonding the material 31 to the base 32 or the material already fed to the base 32. The new material 31 sent thereon is bonded to 31. 36 is provided on the upper side of the base 32,
2 is a movable optical head that can move back and forth and right and left, and sends a laser beam sent from a laser light source 38 via a mirror 37 onto the base 32 to cut the material 31 on the base 32. Has become.

Reference numeral 39 denotes a guide roll 34 sandwiching the base 32.
Guide rolls provided to face the
Is a take-up roll that takes up the unnecessary portion of the material 31 after use through the guide roll 39. When forming a molded article, first, the material 31 fed from the supply roll 33 is used.
Is wound around a take-up roll 40, and the heating roller 35 is moved on the base 32 to adhere the material 31 to the base 32. Next, a laser beam is generated while operating the laser light source 38 and moving the movable optical head 36, thereby cutting the contour 41 having a predetermined shape on the material 31 and cutting line 42 on the outer peripheral edge of the portion used for modeling. Are cut in the unnecessary portions, respectively.

Then, the base portion 3 is formed by the thickness of the formed layer.
2 is lowered, the take-up roll 40 is rotated, a new material 31 is placed on the cut material 31, and the above-described operation is repeated to form a multi-layer laminate 44. Obtaining an object by removing unnecessary portions from the laminate 44 is performed.

In the above-mentioned Japanese Patent Application Laid-Open No. 9-66565, the use of a cutter instead of cutting with a laser beam prevents the parts constituting the modeled object from adhering to the unnecessary parts, thereby preventing the removal of the unnecessary parts from becoming difficult. At the same time, a proposal has been made to make the device cheaper. The heat-sensitive adhesive paper for a three-dimensional printing machine of the present invention can provide a heat-sensitive adhesive paper that can be used for both laser cutting and cutter cutting.

Next, an example of producing a base paper used in the present invention will be described. The base paper of the present invention is a hardwood bleached kraft pulp (LBKP) or a softwood bleached kraft pulp (NBK).
P), bleached hardwood sulphite pulp (LBSP), softwood bleached sulphite pulp (NBSP) and other chemical pulp, groundwood pulp (GP), thermomechanical pulp (T
MP) or other non-wood pulp such as wood pulp such as mechanical pulp, cotton pulp, hemp, bagasse, kenaf, esparto, mulberry, mitsumata, goose, etc., and starch or polyacrylamide Dry paper strength agent, wet paper strength agent such as polyamide / polyamine / epichlorohydrin resin, urea formalin resin, melamine formalin resin, rosin type, alkyl ketene dimer type, alkenyl succinic anhydride type, styrene-
Acrylic, stearic anhydride, petroleum resin-based sizing agents, sulfuric acid bands, fixing agents such as aluminum chloride, sodium aluminate, basic aluminum chloride, basic polyaluminum hydroxide, retention and drainage improvers ,
A paper material appropriately mixed with an antifoaming agent, a dye, a coloring pigment and the like is usually used in a freeness of 250 to 550 ml. S. F. Prepared in
It can be obtained by making a paper using a known paper machine such as a fourdrinier paper machine or a circular net paper machine. At this time, it is also possible to apply an auxiliary agent such as starch, polyvinyl alcohol, or various surface sizes to the paper surface during the paper making by a size press device or the like.
Further, if necessary, a machine calendering treatment or a super calendering treatment is performed to appropriately improve the surface smoothness.

In the present invention, it is preferable to use a wet paper strength enhancer together with the papermaking of the base paper. By using the wet paper strength enhancer, it is possible to reduce the possibility that the molded article after molding absorbs moisture in the air and expands, and is deformed over time.

In the present invention, the basis weight of the base paper is from 40 to
200 g / m ² , more preferably 60 to 120 g / m ²
And When the grammage is less than 40 g / m ² , it takes a long time to form a predetermined thickness, and the efficiency becomes poor.
If it exceeds 0 g / m ² , the heat bonding efficiency will be poor and the bonding strength between the heat-sensitive adhesive papers will be insufficient. When the basis weight of the base paper is 60
When it is set to 120 g / m ² , the balance between the production efficiency and the heat bonding efficiency is improved.

In the present invention, a moisture-proof layer can be further provided on the base paper. By adopting such a configuration, it is possible to further reduce the possibility that the molded article after molding absorbs moisture in the air and expands, and is deformed over time. The moisture-proof layer is formed by applying a resin having a large moisture-proof effect, such as a vinylidene chloride resin, to one or both sides of a ² to 15 g / m ² base paper.

The heat-sensitive adhesive used in the present invention is, for example,
Acrylate copolymer, methacrylate copolymer, polyvinyl acetate, vinyl acetate-acryl copolymer, ethylene-vinyl acetate copolymer, ethylene-vinyl acetate-acryl copolymer, vinyl chloride-ethylene copolymer Polymer, unsaturated polyester resin, ionomer resin, S
Mainly thermoplastic resin such as BR, MBR, NBR,
Additives such as various plasticizers and waxes are added to this as needed, and those having a melting temperature of 50 to 150 ° C. in a state where various additives are added to a thermoplastic resin can be used. If the temperature is lower than 50 ° C., blocking occurs during storage of the paper, and if it is higher than 150 ° C., adhesion by heat becomes extremely poor. In the present invention, the melting temperature is J
It means a value measured according to “Method for measuring melting point of chemical products” specified in IS K0064.

The form of the heat-sensitive adhesive may be any of a water-based, solvent-based, and hot-melt-based adhesive. However, when a solvent-based heat-sensitive adhesive is used, a process for preventing the penetration of the solvent into the base paper is required. In the present invention, it is preferable to use a water-based heat-sensitive adhesive since it must be applied.

As the plasticizer to be added to the thermoplastic resin used for the heat-sensitive adhesive, known plasticizers such as dicyclohexyl phthalate and dihexyl phthalate can be used. Thereby, the thermoplastic resin easily sticks when the heat-sensitive adhesive paper is heated and laminated, and the required adhesive strength can be obtained at a lower temperature than when no plasticizer is added. In the present invention, waxes such as natural wax and synthetic wax can be added to the thermoplastic resin. This allows
This is because blocking can be prevented even when a resin having a low glass transition temperature is used. As other additives, various fillers, coloring agents such as dyes and pigments, antioxidants, thickeners and the like can be used.

In forming a three-dimensional structure using the heat-sensitive adhesive paper of the present invention, it is sometimes preferable that the heat-sensitive adhesive paper has good hot tack properties. Hot tack is
For example, when confectionery is filled in a bag of a light packaging material (usually a polymer film provided with a heat-sensitive adhesive layer) for high-speed automatic packaging, this is one of the characteristics that are very important. The bonded portion of the bag of the packaging material put on the high-speed automatic packaging machine is sandwiched between metals, heated quickly, and thermally bonded under pressure. The thermal bond is released from the pressurized state when the adhesive layer is still molten. When the portion hitting the bottom of the bag is in such a state, the contents (confectionery) are filled at a high speed, so that the adhesive portion still in the molten state is subjected to the action of being peeled off due to the load of the contents. The hot tack property of the heat-bonded part means that the adhesive keeps its perfect state in the molten state before the adhesive cools and solidifies, and the good hot tack property means that the filling process and the bonding process can be performed at a higher speed. Means that you can do it with

In the present invention, the hot tack property is evaluated using a numerical value called "hot tack value". This hot tack value means a value measured by a heat seal tester (trade name “heat seal tester TP701A”, manufactured by Tester Sangyo Co., Ltd.). FIG. 2 shows the principle of the measurement. 3 is an upper seal bar (25 mm in width x 300 mm in length), and 4 is a lower seal bar. Sample 2, that is, two sheets of heat-sensitive adhesive paper are prepared in the form of a long sheet, and are sandwiched between the upper seal bar 3 and the lower seal bar 4 such that the front surface and the back surface (heat-sensitive adhesive-coated surface) overlap. Is installed as follows. In two samples 2,
Through the guide rolls 1 each having a diameter of Rmm, the angle θ
A load of Wg is applied with a certain degree. At this time, the extended portion of the sample is pulled with a load of 2 × Wg so that the sample does not move. The upper seal bar 3 descends to transfer the sample between the lower seal bar 4 and the seal width 25 mm.
The seal length is 300 mm and the weight is Qkg. The upper seal bar 3 can be heated, and the seal temperature can be set to T ° C. After the sealing, the upper seal bar 3 is lifted, and at the same time, the load of 2 × Wg applied to the feeding portion of the sample is released, and the seal 2 is sealed by the load Wg applied to the tip of the sample.
The samples are instantaneously peeled off. At that time, the distance in the long direction peeled off is measured and defined as a hot tack value (mm).
That is, the lower the hot tack value, the better the hot tack property.

When forming a three-dimensional molded article using the heat-sensitive adhesive paper of the present invention, for example, when a situation in which the molded article is to be produced urgently is attempted to increase the speed of the three-dimensional molding machine, If an attempt is made to increase the reciprocating speed of the heating roller, the heat-sensitive adhesive may be insufficiently melted to cause poor bonding. In order to solve this, the temperature of the heating roller may be increased. However, in this case, the heat-sensitive adhesive is in an over-molten state, so the amount of heat trapped inside the modeled object is larger than the amount of heat received from the heating roller radiated to the outside air, and the solidification of the heat-sensitive adhesive is delayed, causing internal distortion. This may cause a problem that the molded article is deformed (the adhesive migrates and swells in the thickness direction of the laminate). As a result of various studies aimed at solving this problem, the present inventors have found that this deformation is unlikely to occur when the hot tack value of the heat-sensitive adhesive is below a certain value.

As a result of investigations by the present inventors, the diameter of the guide roll in the heat seal tester shown in FIG.
0 mm, the pressure load of the upper seal bar is 1 kg / cm ² ,
The hot tack value when the compression time is 1 second, the weight W applied to the tip of the sample is 30 g, the angle θ is 20 degrees, and the sealing temperature is [the melting temperature of the adhesive + 30] ° C, is the deformation due to the internal distortion of the modeled object. When the value is 30 mm or less, there is no problem that the molded article is deformed due to internal strain even if the adhesive is in an over-melted state.
In addition, if a heat-sensitive adhesive paper having a hot tack value of 30 mm or less is used, there is also an advantage that a driver of a three-dimensional molding machine does not require skill in process control such as molding speed and temperature of a heating roller.

Hot tack refers to the fact that the heat-sensitive adhesive keeps its seal intact from the molten state until it cools and solidifies, and is generally highly correlated with the cohesive strength and viscosity of the adhesive. There is no unique method to reduce the hot tack value to 30 mm or less. Generally, it is sufficient to increase the cohesive strength and viscosity, and the molecular weight of the heat-sensitive adhesive, the addition of a tackifier, and the elasticity during melting. The rate may be considered. However, it goes without saying that it is important to design in consideration of other physical properties and factors, such as the melting temperature of the heat-sensitive adhesive and the amount of coating.

According to the results of various studies conducted by the present inventors, the heat-sensitive adhesive is an ethylene-vinyl acetate copolymer resin having a melting temperature of 60 to 90 ° C. The agent is a mixture of an ethylene-vinyl acetate copolymer resin and a wax, and the one having a melting temperature of 60 to 90 ° C. is particularly suitable for the present invention because of its good heat bonding efficiency and excellent blocking resistance. It turned out that it could be used.

When the coating liquid is water-based, the heat-sensitive adhesive
Normally, using a coating machine such as an air knife coater, blade coater or roll coater, a gravure coater or a roll coater for solvent type, or a hot melt coater or extrusion coater for hot melt type. Apply to Coating amount is 5 to 30 g / m
² (in terms of dry weight). If the coating amount is less than 5 g / m ² , the adhesiveness will be poor, and if it exceeds 30 g / m ² , blocking will easily occur, and the adhesiveness will be saturated and it will be economically disadvantageous to apply further. Because it becomes.

In the present invention, when applying the heat-sensitive adhesive to the base paper, it is particularly preferable to form fine irregularities on the surface of the heat-sensitive adhesive layer. By doing so, the surface of the adhesive becomes "point contact" at the convex portion during storage of the heat-sensitive adhesive paper, and blocking resistance can be improved.

Any means may be used for forming the fine irregularities on the surface of the heat-sensitive adhesive layer. However, powder may be added to the heat-sensitive adhesive, and the coating amount of the heat-sensitive adhesive layer may be partially reduced. It is a simple method to form the film by changing the thickness, and the method can be suitably adopted in the present invention.

As the powder to be added to the heat-sensitive adhesive, it is preferable to use, for example, cellulose powder, starch particles, glass beads, polyethylene particles, silica particles, etc., which have a large effect of preventing blocking and have a low rate of decreasing the adhesive force. Can be used for Usually, the particle diameter of these powders is 3 to 200 μm.
m.

As means for forming a fine uneven shape by partially changing the coating amount of the heat-sensitive adhesive layer, the adhesive is applied by a gravure coating machine, and a concave portion having a predetermined shape is provided. A method of forming irregularities of a predetermined shape by filling the concave portion of the gravure roll with an adhesive and transferring it to the base paper, or applying a coating liquid with a high coating solution viscosity and applying a roll coater to form a streaky coated surface of the irregularities And a method of forming wire streaks by rubbing the coated surface immediately after coating with a wire bar.

When a three-dimensional molded article is manufactured using a heat-sensitive adhesive paper having a heat-sensitive adhesive layer having a fine uneven surface on the surface, the adhesive at the convex portion is formed by the roll pressure. Since it moves to the concave side, almost uniform adhesive force is exhibited as a whole. In addition, by adopting such a structure, the heat of the heating roller reaches the base paper during thermal bonding, the moisture contained in the base paper evaporates, there is no escape area, and the base paper is partially bonded due to floating. There is also an advantage that troubles that cause defects can be reduced.

A coating layer of a heat-sensitive adhesive is provided on the back surface of the base paper by the method described above, but a small amount of a thermoplastic resin is coated on the surface of the base paper (the surface opposite to the coating layer of the heat-sensitive adhesive). Can also be appropriately performed. As the type of the thermoplastic resin, the same resins as those used for the heat-sensitive adhesive layer, that is, acrylate copolymer, methacrylate copolymer, polyvinyl acetate, vinyl acetate-acryl copolymer , An ethylene-vinyl acetate copolymer, an ethylene-vinyl acetate-acrylic copolymer, a vinyl chloride-ethylene copolymer, an ionomer resin, SBR, MBR, NBR and the like can be used. 5-5 g / m ²
And By providing this layer, familiarity with the heat-sensitive adhesive layer provided on the back surface of the base paper is improved, and strong adhesion is easily obtained. However, such a structure tends to cause a problem that the thermoplastic resin is transferred to the surface of the heat roller and contaminates the roller when producing a three-dimensional molded article. To prevent this problem, it is effective to coat the surface of the heat roller with a resin having excellent releasability, such as polytetrafluoroethylene resin.

The heat-sensitive adhesive paper of the present invention obtained by the above-described method is heat-bonded by using a three-dimensional molding machine as illustrated in FIG. 1 to produce a three-dimensional molded article. . The paper expands and contracts by absorbing and releasing moisture, and a three-dimensional object may cause undesirable deformation. In order to prevent this, a resin having a low water vapor permeability, such as an acrylic resin, a polyester resin, a polyvinyl chloride resin, a polyvinylidene chloride resin, a polyolefin resin, etc., is usually applied to the surface of the molded product at 5 to 50 g / m ² can be coated using a brush or the like. According to the results of studies by the present inventors, polyvinylidene chloride resin has excellent moisture resistance,
The result was the best.

[0032]

EXAMPLES The present invention will be described in detail below with reference to Examples and Comparative Examples, and all weights are dry weights. [Making of base paper (A) without added wet paper strength enhancer] NB
Raw pulp consisting of 25 parts by weight of KP and 75 parts by weight of LBKP was mixed with 400 ml of C.I. S. F. Then, kaolin was added to 5% by weight of pulp, rosin sizing agent was added to 0.6% by weight of pulp, and sulfuric acid band was added to 2% by weight of pulp to prepare a paper stock. Base papers of various basis weights were made according to the method. [Papermaking of base paper (B) to which wet paper strength enhancer is added] Polyamine / polyamide / epichlorohydrin resin (trade name “WS-500”, Nippon PMC) as wet paper strength enhancer
A paper was prepared in the same manner as described above except that 0.5% by weight of pulp was further added.

[Application of Heat-Sensitive Adhesive (A)] An unsaturated polyester resin (melting temperature: 150 ° C.) was applied using a gravure coater. [Application of heat-sensitive adhesive (B)] An unsaturated polyester resin (melting temperature: 50 ° C) was applied using a gravure coater. [Coating of heat-sensitive adhesives (C1 to C4)] Ethylene / vinyl acetate copolymer emulsions and wax emulsions are mixed at various mixing ratios to prepare heat-sensitive adhesives having different melting temperatures, which are then coated using a gravure coater. Coated.

[Examples 1 to 10] Table 1 shows the structure of the heat-sensitive adhesive paper used in each example, that is, the type and basis weight of the base paper, the type of the heat-sensitive adhesive, the melting temperature, the coating amount, and the coating surface. The presence or absence of irregularities is shown together. The unevenness of the heat-sensitive adhesive-coated surface was formed by rubbing the coated surface immediately after the coating with a wire bar (the interval between the convex portions was 0.7 mm).

Example 11 A heat-sensitive adhesive paper was produced in the same manner as in Example 3 except that the surface of the base paper was coated with 5 g / m ² of an unsaturated polyester resin having a melting temperature of 180 ° C.

[Comparative Examples 1 to 4] Table 1 shows the structure of the heat-sensitive adhesive paper used in each comparative example, ie, the type and basis weight of the base paper, the melting temperature of the heat-sensitive adhesive, the coating amount, and the unevenness of the coated surface. The presence or absence is shown together. The unevenness of the coated surface was formed by rubbing the coated surface immediately after the application of the heat-sensitive adhesive with a wire bar (the interval between the convex portions is 0.7 mm).

[0037]

[Table 1]

The following items were evaluated using the heat-sensitive adhesive papers shown in Table 1. The results are summarized in Table 2. [Evaluation of anti-blocking property] Ten heat-sensitive adhesive paper samples having a size of 5 × 5 cm were stacked so that the adhesive-coated surface and the non-coated surface were sequentially overlapped, and 500 g in a thermostat at 30 ° C.
/ Cm ² , and the sample was peeled off after cooling, and the state of blocking was evaluated. The evaluation was performed according to a 5-point method. The state where no blocking occurred was evaluated as 5 points, and the state where blocking was remarkably occurred was evaluated as 1 point. Three
It is practically necessary that the number of points is equal to or more than that (the state in which blocking that would break the paper upon peeling has not occurred).

[Evaluation of Performance as Adhesive Paper] Using a three-dimensional molding machine (trade name “LOM1015E”, sold by Toyota Koki Co., Ltd.) as shown in FIG.
The bonding speed was changed according to the values shown in Table 2 to produce a cubic object having a length, width, and height of 10 cm, respectively, and the following evaluation was performed.

[Adhesion] The paper layer to which the molded article was adhered was peeled off by hand and evaluated by a five-point method. Five points indicate ideal adhesion, one point indicates no adhesion, and practically three or more points are required.

[Hot tack value and deformation of molded object] FIG. 2
The hot tack value of the heat-sensitive adhesive paper was measured using a heat seal tester (trade name “Heat Seal Tester TP701A”, manufactured by Tester Sangyo Co., Ltd.). The measurement conditions were as follows: the diameter of the guide roll was 20 mm, the pressure load on the upper seal bar was 1 kg / cm ² , the pressure time was 1 second, the weight W applied to the tip of the sample was 30 g, the angle θ was 20 degrees,
This is the hot tack value when the sealing temperature is [adhesive melting temperature + 30] ° C. Table 2 also shows the presence or absence of deformation of the molded article when heat-bonded under the above conditions.

[Stretching of molded article] A polyvinylidene chloride resin was applied to the obtained cubic molded article with a brush in order to impart moisture resistance, and the molded article was placed in a thermo-hygrostat at 20 ° C and 65% RH.
After standing for 4 hours, the expansion and contraction caused by the absorption of moisture by the cube was measured. Evaluation was made by a five-point method. Five points indicate that no problematic expansion and contraction occurred, and one point indicates that expansion and contraction occurred remarkably. Practically, three or more points are required.

[Comprehensive Evaluation] The above items were comprehensively evaluated by a five-point method. Five points indicate no problem at all, one point indicates a remarkable defect, and practically three or more points are required.

[0044]

[Table 2]

From the results of Tables 1 and 2, the following can be understood. 1) From the comparison between each example and the comparative example, the melting temperature is 50 to 1
The 50 ° C. heat sensitive adhesive layer of the heat-sensitive adhesive sheet having a basis weight 40~200g / m ² of the present invention on the back surface of the base paper 5 to 30 g / m ² provided, as heat-sensitive adhesive sheet for three-dimensional molding machine It turns out that it has performance. 2) It is also found that the use of an ethylene-vinyl acetate copolymer as the adhesive is superior in overall evaluation. 3) Example 3 in which no thermoplastic resin layer is provided on the base paper surface;
In comparison with Example 11 in which the thermoplastic resin layer was provided, it was found that the provision of the thermoplastic resin layer improved the adhesiveness. 4) In comparison with Example 6 in which fine irregularities are not provided on the surface of the adhesive layer and Example 8 in which irregularities are provided, it can be seen that blocking resistance is improved when fine irregularities are provided. 5) In comparison with Example 9 in which the wet paper strength enhancer was not used as the base paper and Example 10 in which the wet paper strength enhancer was used, it was found that the molded article was less likely to expand and contract when the wet paper strength enhancer was used. 6) It can be seen that when the hot tack value is 30 mm or less, there is no deformation of the molded article.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an example of a three-dimensional molding machine for producing a three-dimensional molded object using a heat-sensitive adhesive paper.

FIG. 2 is an explanatory diagram showing the concept of an apparatus for measuring a hot tack value.

[Explanation of symbols]

 31 Thermally Sensitive Adhesive Paper 32 Vertically Movable Table 33 Supply Roll 34 Guide Roll 35 Heating Roller 36 Movable Optical Head 37 Mirror 38 Laser Light Source 39 Guide Roll 40 Take-up Roll 41 Predetermined Contour 42 Cutting Line 43 Grid Cutting Wire 44 laminate

Claims (15)

[Claims] 1. A heat-sensitive adhesive paper having a heat-sensitive adhesive layer provided on a back surface is sequentially supplied to an upper surface of a vertically movable table, and the surface of the supplied heat-sensitive adhesive paper is heated while being pressed, so that the table or the table is heated. By adhering to the surface of the heat-sensitive adhesive paper that has already been supplied, a cutting line of a predetermined shape is provided on these heat-sensitive adhesive papers to form a laminate including a plurality of layers, and unnecessary portions are removed from the laminate. In a heat-sensitive adhesive paper used for a three-dimensional printing machine for obtaining a three-dimensional printing object, the melting temperature is 50 to 1
The heat-sensitive adhesive layer of 50 ° C., heat-sensitive adhesive sheet for three-dimensional molding machine, characterized by comprising 5 to 30 g / m ² on the rear surface of the base paper having a basis weight 40~200g / m ^2. 2. The hot tack value of the heat-sensitive adhesive is 30.
2. The heat-sensitive adhesive paper for a three-dimensional printing machine according to claim 1, wherein the thickness is not more than mm. 3. The base paper having a basis weight of 60 to 120 g / m ^2.
The heat-sensitive adhesive paper for a three-dimensional printing machine according to claim 1, wherein: 4. The method according to claim 1, wherein the heat-sensitive adhesive is an ethylene-vinyl acetate copolymer resin.
The heat-sensitive adhesive paper for a three-dimensional printing machine according to any one of claims 3 to 7. 5. The heat-sensitive adhesive according to claim 1, wherein the heat-sensitive adhesive is a mixture of an ethylene-vinyl acetate copolymer resin and a wax, and has a melting temperature of 60 to 90 ° C.
The heat-sensitive adhesive paper for a three-dimensional printing machine according to any one of claims 1 to 4. 6. The heat-sensitive adhesive layer is coated on the back surface of
Heat-sensitive adhesive sheet for three-dimensional modeling machine according to any one of claims 1-5, characterized in that provided 25 g / m ^2. 7. The heat-sensitive adhesive paper for a three-dimensional molding machine according to claim 1, wherein fine irregularities are formed on the surface of the heat-sensitive adhesive layer. 8. The heat-sensitive adhesive paper for a three-dimensional molding machine according to claim 7, wherein the fine uneven shape is formed by adding powder to the heat-sensitive adhesive. 9. The three-dimensional molding machine according to claim 7, wherein the fine irregularities are formed by partially changing a coating amount of the heat-sensitive adhesive layer. Thermal adhesive paper. 10. The heat-sensitive adhesive paper for a three-dimensional printing machine according to claim 1, wherein the base paper is made using a wet paper strength enhancer. 11. The heat-sensitive adhesive paper for a three-dimensional printing machine according to claim 1, wherein a moisture-proof layer is provided on the base paper. 12. The method according to claim 1, wherein a thermoplastic resin layer is provided on the surface of the base paper in an amount of 0.5 to 5 g / m ² .
The heat-sensitive adhesive paper for a three-dimensional printing machine according to any one of claims 11 to 11. 13. The heat-sensitive adhesive paper according to claim 1, which is sequentially supplied to an upper surface of a vertically movable table, and heated while pressing the surface of the supplied heat-sensitive adhesive paper. Then, the heat-sensitive adhesive paper is bonded to the table or the surface of the heat-sensitive adhesive paper that has already been supplied, and a cut line having a predetermined shape is formed on the heat-sensitive adhesive paper to form a laminate including a plurality of layers. Three-dimensional object manufactured by removing the 14. The three-dimensional structure according to claim 13, wherein the surface of the three-dimensional structure is coated with a resin having low water vapor permeability. 15. The three-dimensional structure according to claim 14, wherein the resin having a low water vapor permeability is polyvinylidene chloride.