JP4697849B2 - Manufacturing method for exhibition mount - Google Patents

Description

  The present invention relates to a method for manufacturing an exhibition mount, in which paper is laminated on both sides of a polystyrene resin foam plate that is suitably used for POP advertising applications and the like.

  Since polystyrene-based resin foam plates are lightweight, inexpensive, and easy to process, they are actively used as mounts for printing advertisements directly on the surface of the foam plates or attaching printed matter such as advertisements and photographs. However, since the printability of the surface of the foam plate is inferior to that of paper or the like, a laminate of paper on the surface of the foam plate is suitably used as a display board particularly suitable for printing.

  This display board is manufactured by laminating paper on both sides of a polystyrene resin foam board with an adhesive, but if the adhesion between the foam board and the paper is insufficient, the paper will peel off from the edges. In order to reduce the value of the product, it was necessary to have sufficient adhesion.

  However, if a large amount of adhesive is used to ensure adhesion in the production of this display mount, the cost increases or the laminated paper expands and contracts due to the influence of moisture etc. contained in the adhesive. However, there is a problem that the display board is warped and wrinkles are generated on the paper, and that drying takes a long time and productivity of the display board is lowered.

  In view of the above background, there has been a demand for a method for providing sufficient adhesive strength to paper even if the adhesive used for laminating the foam plate and paper is reduced.

  As one of the methods, improvement of the surface property of the foam plate was performed. The technology described in Japanese Patent Application Laid-Open No. 2003-220639 improves the surface smoothness of the foamed plate and makes the foamed plate provided with minute concave holes on the surface that can use the anchor effect between the adhesive and the foamed plate. (Patent Document 1). By using such a foamed plate, it has become possible to reduce the amount of adhesive used in a method for manufacturing a display board in which paper is laminated on both sides.

  However, when manufacturing with a reduced amount of adhesive, parts with weak adhesive strength are generated locally, or foam plates and paper are completely bonded in a circular shape when the atmosphere is dry, such as in winter. It was still not sufficient for the production of a stable display mount.

JP 2003-220639 A

  This invention relates to a method for manufacturing a display board in which paper is laminated on both sides, and exhibits an adhesive strength between a foamed plate and paper that can withstand practical use without any variation in adhesiveness even as a relatively small amount of adhesive. An object of the present invention is to provide a method for manufacturing a board with high productivity.

As a result of earnest study, the inventor applied a water-based adhesive on both the front and back surfaces of the polystyrene resin foam plate, and then in the method of manufacturing an exhibition mount for attaching paper,
It has been found that the above-mentioned problems can be solved by applying a surfactant in advance to the adhesive application surface of the polystyrene-based resin foam plate, then applying the aqueous adhesive, and pasting paper.

  The present invention relates to a method for manufacturing an exhibition mount in which an adhesive is applied to the front and back surfaces of a polystyrene resin foam plate, and then a paper is pasted. This is a method for producing an exhibition mount, characterized in that an agent is applied, the adhesive is then applied, and a paper is pasted. Further, the present invention provides a display board in which paper is laminated on at least the surface of a polystyrene resin foam plate via an aqueous adhesive, and a surfactant is previously provided on the adhesive-coated surface of the polystyrene resin foam plate. It is a mount for exhibition characterized by being applied.

The surfactant is preferably contained in an amount of 0.05 to 0.5 g / m ² per coated surface of the adhesive. Moreover, it is preferable that the said adhesive agent is 18 g / m < ² > or less as a non-volatile component per application | coating surface of the said adhesive agent, especially 5-18 g / m < ² > as a non-volatile component.
The surface coated with the surfactant preferably has a water contact angle in the range of 55 ° to 80 °.
Further, it is preferable that the surface coated with the surfactant has a charge amount within a range of ± 3 KV.

Thereby, the adhesive is applied in a uniform state over the entire surface of the foamed plate, the thickness of the adhesive layer is easily uniformed, and stable adhesiveness can be obtained with a smaller amount of adhesive. In addition, it is possible to prevent adhesion failure due to local application unevenness of the adhesive, which seems to be caused by static electricity.
That is, even when the amount of the adhesive is the same, a defect is generated in the adhesive layer when no surfactant is applied, but this defect is reduced by applying the surfactant. Furthermore, by increasing the coating amount, defects are further reduced and the adhesive strength is increased. This phenomenon is thought to be due to the fact that the affinity between the polystyrene resin foam plate containing the surfactant on the surface and the water-based adhesive is improved, and this defect is reduced because the adhesive extends thinly on the surface of the polystyrene resin foam plate. It is done. In particular, in the case of a foamed plate in which minute concave holes (for example, concave holes having a major axis of the concave hole opening of 25 μm or more and less than 100 μm) that provide an anchoring effect of an adhesive on the surface are formed on the surface, preferable “wetting” In this state, the water-based adhesive penetrates into the concave hole containing this surfactant, and the affinity of the water-based adhesive and its physical anchoring effect combine with each other. It spreads in a uniform state over the entire surface including the concave holes, and the adhesive strength is improved.

  In addition, as described above, the polystyrene resin foam board is likely to be charged under dry conditions such as in the winter season, so that the water-based adhesive is repelled, and there may be a portion where no adhesive layer is present. When a surfactant is included in the adhesive application surface, the antistatic effect of the surfactant is exerted on the adhesive application surface, so that the adhesive does not repel on the application surface, thereby avoiding poor adhesion. And the adhesive is applied uniformly.

  As described above, the manufacturing method of the display board of the present invention can reduce defects on the coated surface of the water-based adhesive used for bonding the polystyrene-based resin foam plate and the paper, so that even a small amount of adhesive can be bonded. It is possible to manufacture a display board that exhibits good adhesiveness (hereinafter referred to as interleaf property) of paper to the agent and is difficult to peel off the adhered paper.

  In addition, it is preferable that the surface on which the surfactant is applied has a water contact angle in the range of 55 ° to 80 ° as described above. When a large amount of surfactant is applied and the angle is less than 55 °, the friction coefficient on the surface of the foamed plate becomes too small, causing slippage with a feed roll or the like, making it difficult to produce stably. When the application amount of the surfactant is small and exceeds 80 °, it is difficult to obtain the effect of the present invention.

  Further, as described above, the surface on which the surfactant is applied preferably has a charge amount within a range of ± 3 KV. When the charge amount is larger than +3 KV or smaller than −3 KV. Since such a foamed plate is easily charged, there is a case where it is further charged when paper is bonded, and the adhesive is repelled by the discharge of the charged static electricity, which may cause poor coating.

  In the present invention, paper is laminated with an adhesive on a polystyrene resin foam board coated with a surfactant, so that practical adhesive strength can be obtained with a small amount of adhesive, no warpage, and no wrinkles on the paper. It is possible to manufacture a display board with low productivity at low cost.

  FIG. 1 is a schematic cross-sectional view of a display board showing an embodiment of the present invention. In FIG. 1, 10 is a display board, 100 is a polystyrene resin foam board constituting the display board 10, and 103 and 103 are papers laminated on both front and back surfaces with aqueous adhesives 102 and 102. Surfactants 101 and 101 are applied in advance to the application surfaces of the adhesives 102 and 102 in the polystyrene resin foam plate.

(Polystyrene resin foam board)
As a polystyrene-type resin foam board which can be used for this invention, the sheet | seat obtained by a well-known extrusion foaming method and its laminated body can be used.

  Specific polystyrene-based resins constituting the polystyrene-based resin foam plate include polystyrene, rubber-modified polystyrene, styrene-acrylic acid copolymer, and the like.

  The polystyrene-based resin foam plate can be a foam sheet obtained by a conventional extrusion foam molding method or a laminate thereof, but is obtained by a fusion method because of its excellent flatness. Those are preferred.

The polystyrene-based resin foam plate used in the present invention has a density of 0.13 to 0.042 g / cm ³ , a thickness of ^{3 to} 15 mm, an average cell diameter of 0.1 to 0.4 mm, and an open cell rate of 15% or less. It is preferable. The density is 0.13 g / cm ³
If it is larger, the lightness of the display mount is impaired. If it is less than 0.042 g / cm ³ , the strength of the display board will be insufficient. If the thickness is less than 3 mm, the strength is insufficient. If it exceeds 15 mm, too much display space is taken, which is not preferable. If the open cell ratio exceeds 15%, the strength decreases.

Moreover, as a polystyrene-type resin foam board used by this invention, the foam board in which the minute concave hole is formed in the application | coating surface of the said adhesive agent is preferable. Specifically, it is a foamed plate in which a concave hole having a diameter (diameter) of an opening of 25 μm or more and less than 100 μm is formed. It is preferable to have the concave holes at a rate of 20/4 mm ² or more per unit area of the adhesive application surface.

A more preferable polystyrene-based resin foam plate is a foam plate as described in JP-A No. 2003-220639. That is, a plate-like or sheet-like polystyrene-based resin foam board provided with a skin layer, and the surface of the skin layer has 20 recesses per unit area whose major axis of the opening is 25 μm or more and less than 100 μm. It is a polystyrene resin foam plate having a ratio of 4 mm ² or more. In addition, the surface roughness of the surface of the skin layer is preferably 2 to 10 μm in terms of the center line average roughness Ra. Thereby, it becomes possible to completely cover the surface of the foam plate with less adhesive, and the anchor effect can be used more effectively.

In addition, about the measurement of the number of the said recessed hole parts of the said foaming board surface, and the major axis of opening, the enlarged photograph (40-times multiplication factor) of the surface of a polystyrene-type resin foaming board is taken with a scanning electron microscope [Hitachi Ltd. S-3000N] was used to measure the major axis of all the recesses in the area where the actual dimension is 2 mm square (= 4 mm ² ), and the major axis was 25 μm or more and less than 100 μm. The number of recesses having a specific major axis is obtained. Photographing is performed at any three locations on the foam of the polystyrene resin foam plate, and the average number of the recesses of a specific long diameter at each position obtained thereby is arithmetically averaged (rounded off after the decimal point) to obtain polystyrene resin foam The number of concave portions having a specific long diameter on the plate (pieces / 4 mm ² ) was used.

  The surface roughness was measured using a surface roughness measuring machine [Handy Surf E-30A] manufactured by Tokyo Seimitsu Co., Ltd. under the conditions of a cutoff value of 0.8 mm and a measurement length of 4 mm. The surface roughness of the surface was measured, and the centerline average roughness Ra was determined from the measured value. The measurement is carried out by averaging the values obtained by carrying out the calculation in five arbitrary locations for the extrusion direction (MD direction) of the polystyrene-based resin foam plate and the direction (TD direction) perpendicular thereto, and the MD direction and The center line average roughness Ra (μm) in the TD direction was used.

The average bubble diameter is measured by measuring the average bubble diameter inside the polystyrene resin foam plate by ASTM.
In accordance with the measurement method described in D2842-69, the foamed plate is first cut along the MD direction and the TD direction, and an enlarged photograph of each cut surface is taken with a scanning electron microscope [manufactured by Hitachi, Ltd. S-3000N], and then in the MD direction and the TD direction, and further in the thickness direction (VD direction) of the foam plate perpendicular to both directions, provided at an arbitrary position on the photographed photo, The number of bubbles on a straight line (length 60 mm) along each direction was counted, and the average chord length t of the bubbles in the above three directions was determined by the following formula.
Average string length t = 60 / (number of bubbles × photo magnification)
Then, the average bubble diameter d (= φMD, φTD or φVD) in each direction was determined by the following formula.
Average bubble diameter d (mm) = t / 0.616

Regarding the measurement of the open cell rate, the internal open cell rate (%) of the polystyrene-based resin foam plate is determined by ASTM.
The measurement was performed according to the air pycnometer (air comparison type hydrometer) method (1-1 / 2-1 atmospheric pressure method) defined in D-2856. The air comparison type specific gravity meter manufactured by Toshiba Beckman Co., Ltd. was used.

The density was determined by measuring the weight and volume of the polystyrene-based resin foam plate density (g / cm ³ ) and calculating weight (g) ÷ volume (cm ³ ).

(adhesive)
The adhesive used in the present invention is preferably an aqueous adhesive using water as the main solvent because the effect of the surfactant is likely to appear and the adhesive is thinly applied using a roll coater or the like.

  Water-based adhesives include starch, modified starch, casein, carboxymethylcellulose, hydroxycellulose, soy protein, polyvinyl alcohol and other water-soluble polymers and water-based adhesives, polyvinyl acetate, ethylene-acetic acid There are emulsion-based emulsions such as vinyl / acrylic copolymer resins, ethylene / vinyl acetate copolymers, acrylic / modified vinyl acetate copolymer resins, etc., but emulsion-based aqueous adhesives that are easy to handle and have good processability are preferred. .

The aqueous emulsion adhesive is preferably used at a concentration such that the adhesive component (nonvolatile component) is 50 to 60% by weight. If the amount is too small, the initial adhesive strength is inferior. If the amount is too large, the viscosity becomes too high and it becomes difficult to apply a uniform thin film.
The coating amount is preferably 10 to 30 g / m ² (5 to 18 g / m ² as a non-volatile component). If it is less than 10 g / m ² , it is difficult to apply uniformly, and adhesion cannot be ensured. If it exceeds 30 g / m ² , the adhesiveness is sufficient, but the cost is increased, the paper is wrinkled by excessive moisture, and it takes a long time to dry at the time of production, resulting in a decrease in productivity. 10-25 g / m ² is more preferable, and 10-20 g / m ² is particularly preferable.
The amount of the non-volatile component is a value measured in accordance with JIS K6828, and indicates (percentage of the weight of the sample after drying / the weight of the sample before drying) after leaving the sample at 105 ° C. for 1 hour. Index.

  The amount of adhesive applied in the present invention is determined by examining the weight of the adhesive from the weight of the display board immediately after bonding both the weight of the paper and the foamed plate measured in advance, and from the bonded area It was calculated by dividing.

(paper)
Examples of the paper used in the present invention include high-quality paper, Kent paper, and kraft paper.
The basis weight is preferably 30 to 150 g / m ² , more preferably 60 to 110 g / m ² . If it is less than 30 g / m ² , the strength reinforcing effect is small and the printability may be insufficient. If it exceeds 150 g / m ² , the cost increases and the display board becomes heavy.

(Surfactant)
The surfactant used in the present invention has a hydrophilic group and a lipophilic group, and includes an aliphatic soap, an N-acyl amino acid salt, an alkyl ether carboxylate, an alkyl sulfonate, an alkyl benzene sulfonate, and an alkyl naphthalene. Anionic surfactants such as sulfonates, sulfosuccinates, α-olefin sulfonates, aliphatic amine salts, cationic surfactants such as quaternary ammonia salts thereof, and zwitterionic systems such as aminocarboxylates Nonionic surfactants such as surfactants and ether types such as polyoxyethylene alkyl ethers, ester types, and nitrogen-containing types may be mentioned.

  Among these surfactants, alkyl sulfonates are more desirable because of their high affinity with emulsion-type aqueous adhesives such as polyvinyl acetate.

(Surfactant application method)
In the present invention, the surfactant is applied to the polystyrene resin foam plate by spraying the surface of the polystyrene resin foam plate with a diluted solution of the surfactant in the form of a mist or diluting the non-woven fabric with water absorption. The method of making it contain continuously and making it contact is mentioned. The latter contact coating method is desirable in view of simplicity and cost.

  In addition, there is a method in which a surfactant is pre-blended with a thermoplastic resin, and then melt-kneaded and extrusion-foamed to obtain a foamed plate containing the surfactant, but the effect is small compared to coating.

The coating amount of the surfactant is preferably 0.05 to 0.5 g / m ² per adhesive surface. If it is less than 0.05 g / m ² , the adhesion improving effect cannot be obtained. On the other hand, even if the surfactant is applied in excess of 0.5 g / m ² , the adhesive improvement effect is not increased, the surface friction coefficient of the foamed plate is lowered, and the metal roll is used in the manufacturing process of the display board. Slip occurs when the foam plate is fed, etc. 0.08 to 0.3 g / m ² is more preferable.

As a method for applying a certain amount of surfactant, a predetermined amount of an aqueous solution containing a surfactant diluted with water to a predetermined concentration is applied to a foamed plate. The water evaporates and the surfactant remains on the foam board. The coating amount of the surfactant-containing aqueous solution is preferably 10 to ²⁰ g / m ² . If it is less than 10 g / m ² , it is difficult to apply uniformly and stably, and if it exceeds 20 g / m ² , it takes time to dry the moisture. If it is 20 g / m ² or less, when it is applied by an extrusion line of the foam plate, the extruded foam plate is still high in temperature, moisture easily evaporates, and the subsequent drying time can be reduced. If the coating amount is constant within this range and the concentration of the surfactant in the aqueous solution is changed, the coating amount of the surfactant can be easily adjusted.

(Lamination method)
A thermoplastic resin foam board with a surface-treated surfactant is applied thinly and uniformly using a roll coater or the like, and then a laminated paper is pasted using a pressure roller after placing the paper to be bonded.

An aqueous solution of an anionic surfactant diluted to 1.0% was applied to each surface of a polystyrene foam plate so as to be 16 g per 1 m ² on both sides using the surfactant application device shown in FIG. . FIG. 3 is a schematic side view showing the concept of the surfactant coating apparatus. In FIG. 3, 100 is a polystyrene foam plate, and 200 is a coating apparatus main body. As shown in FIG. 3, this coating apparatus main body 200 includes one ends of polyester nonwoven fabrics 203 and 204 in which an aqueous solution of a surfactant is contained on the front and back surfaces of a sheet-like polystyrene foam plate 100 transferred by rolls 201 and 202. It is the structure which a part contacts. The other end portions of the polyester nonwoven fabrics 203 and 204 are impregnated in supply tanks 205 and 206 in which an aqueous solution of a surfactant is stored. As shown in FIG. 3, the aqueous solution of the surfactant is fed to the supply tanks 205 and 206 from the surfactant tank 208 in which the aqueous solution of the surfactant is stored through the liquid feed pump 207. The arrow indicates the direction of feeding the aqueous solution. Further, from the supply tanks 205 and 206, an excess aqueous solution of the surfactant is returned to the surfactant tank 208. The arrow indicates the return direction of the aqueous solution.

In this example, the polystyrene foam plate has a density of 0.066 g / cm ³ , a thickness of 7 mm, a width of 630 mm, and a length of 930 mm. The aqueous solution of the anionic surfactant is prepared by adding 1 part by weight of an anionic surfactant (Sanyo Kasei, trade name “Chemist 3033”) to 99 parts by weight of water. The actual coating amount of the surfactant on the polystyrene foam plate is 0.16 g / m ^{2 on} one side.

As a result of measuring the charge amount of the obtained polystyrene foam plate coated with a surfactant, it was 1 KV. Moreover, it was 60 degrees when the contact angle of water was measured. Similarly, the surface specific resistance was 6.2 × 10 ⁹ [Ω].

  Next, using this polystyrene foam plate, an exhibition board was manufactured by a bonding apparatus as shown in FIG. FIG. 4 is a schematic view showing a bonding apparatus. In FIG. 4, reference numeral 300 denotes a stock apparatus that accumulates polystyrene foam plates coated with the surfactant on the front and back surfaces and feeds them to the adhesive coating apparatus 301 side. The polystyrene foam plate 100 coated with the surfactant is fed to the adhesive coating device 301 by a feed roller 302 at a constant speed. In the adhesive application device 301, the aqueous adhesives 102 and 102 stored in the adhesive tanks 3011 and 3012 are transferred to the application rolls (quarter rolls) 3015 and 3016 by the supply rolls 3013 and 3014, and the surfactant is added. The aqueous adhesives 102 and 102 are applied to the adhesive application surface of the applied polystyrene foam plate 100 by application rolls 3015 and 3016. Subsequently, as shown in FIG. 4, the paper 103, 103 unwound from the long rolls 303, 303 is placed on the front and back surfaces of the polystyrene foam plate 100 coated with a water-based adhesive, and the pressure rolls 304, The paper 103 is bonded to the front and back surfaces of the polystyrene foam plate 100 by 304.

In this example, an ethylene / vinyl acetate copolymer aqueous emulsion adhesive (Kanae Chemical Industry Co., Ltd., A-3400L, nonvolatile content 55% ± 2%) is used as the aqueous adhesive, and a quarter roll is used. 12 g (one side) of m ² of the polystyrene foam plate 100 was applied. As the paper, Kent paper (basis weight 86 g / m ² , thickness 0.09 mm) is used. As described above, this paper is placed on the front and back surfaces of the polystyrene foam plate 100 coated with the surfactant, and using a pressure roll. Compressed and laminated. The obtained paper-laminated polystyrene foam board 10 was air-dried for 2 days, and was obtained as a display board for Example 1.

  Next, the peel strength of each of the obtained display mounts was measured by the following method with respect to the feeding direction (flow direction) and the width direction of the laminated polystyrene foam plate. As a result of the obtained peel strength, the integral average value in the flow direction is 322.1 g / f, the width direction is 228.7 g / f, and the minimum point load is 142.0 g / f and 131.0 g / f in the flow direction. Met.

  Next, with respect to the display board of the above embodiment of the polystyrene foam board on which the paper is laminated, the paper is carefully peeled off from the polystyrene foam board so that the material state does not occur in the surface state of the bonded portion, and the micro-sheet of KEYENCE Corp. Using a scope (trade name: KEYENCE VH-5000), it was magnified 50 times, and the adhesion of the adhesive was confirmed on the peeled surface of the Kent paper peeled from the polystyrene foam plate. As a result, it was confirmed that the adhesive was uniformly distributed over almost the entire surface. FIG. 2-1 is an enlarged photograph taken by coloring the peeled surface of the Kent paper peeled off from the polystyrene foam plate on the display board of Example 1 at a magnification of 50 times using a KEYENCE microscope VH-5000. It is. In the photograph, the dark part is a part with a lot of adhesive, and the light part is a part with little adhesive. In Example 1, it was confirmed that there was little difference in shading and there was little uneven distribution of the adhesive.

In the same manner as in Example 1, a polystyrene foam plate (density 0.066 g / cm ³
3) (thickness 7 mm, width 630 mm, length 930 mm) using the surfactant coating apparatus shown in FIG. 3, so that the anionic surfactant aqueous solution diluted to 0.5% is 16 g per 1 m ² on both sides. To each surface (actual coating amount 0.08 g / m ² (single side)). The anionic surfactant is Sanyo Kasei, trade name “Chemist 3033”, and its aqueous solution is 99.5 parts by weight of water and 0.5 part by weight of the anionic surfactant (Sanyo Kasei, trade name “Chemist 3033”). In addition it has been prepared.

The charge amount of the obtained polystyrene foam plate coated with surfactant was measured and found to be 2.4 KV. The contact angle of water was measured and found to be 70 °. Similarly, the surface specific resistance was 1.0 × 10 ¹⁰ [Ω].

Example 1 Similarly, the ethylene-vinyl acetate copolymer aqueous emulsion adhesive (Kanae Chemical Industry (Ltd.), A-3400L, nonvolatile content 55% ± ^{2%) m} 2 per 12 g (one side with a quarter roll ) And Kent paper was applied using a pressure roll. After air-drying for 2 days, the display board for Example 2 was obtained.

  For this display board, the peel strength in the flow direction and the width direction was measured in the same manner as in Example 1. As a result of the peel strength obtained, the integrated average value in the flow direction is 280.7 g / f, the width direction is 221.0 g / f, and the minimum point load is 137.0 g / f in the flow direction and 109.0 g in the width direction. / F. Further, as in Example 1, the adhesive surface was carefully peeled off and the adhesion of the adhesive was confirmed using a microscope. As shown in FIG. It was recognized that there was little unevenness in the distribution of the adhesive, although there was a slight difference in density compared to.

[Comparative Example 1]
Exhibit mount of Comparative Example 1 was obtained by manufacturing under the same conditions as in Example 1 except that the surfactant was not applied. With respect to this display board, the charged amount of the polystyrene foam plate was measured and found to be 5 KV. The contact angle of water was measured and found to be 85 °. Similarly, the surface specific resistance was 1.6 × 10 ¹⁶ . Thereto, Example 1 and ethylene-vinyl acetate copolymer aqueous emulsion as in Example 2 (Kanae Chemical Industries (Ltd.), A-3400L, nonvolatile content 55% ± ^2%) m 2 using a quarter roll 12g (one side) was applied and Kent paper was applied using a pressure roll. After air-drying for 2 days, a display board for Comparative Example 1 was obtained.

  For the display board of Comparative Example 1, the peel strength in the flow direction and the width direction was measured in the same manner as in Example 1. As a result of the obtained peel strength, the integrated average value in the flow direction is 250.7 g / f, the width direction is 181.2 g / f, and the minimum point load is 82.0 g / f in the flow direction and 71. It was 0 g / f. However, the paper surface of the adhesive part was carefully peeled off as in Example 1, and the adhesion of the adhesive was confirmed using a microscope. As shown in FIG. 2-3, the difference in density was large and the uneven distribution of the adhesive was large. It was confirmed.

[Comparative Example 2]
As in Example 1, an anionic surfactant (Sanyo Kasei, trade name “Chemistat”) diluted to 4.0% in a polystyrene foam plate (density 0.066 g / cm ³ , thickness 7 mm, width 630 mm, length 930 mm). 3033 ") The aqueous solution was applied to each surface so that the amount was 16 g per 1 m ² on both surfaces (actual coating amount 0.64 g / m ² (single surface)). The amount of charge of the surfactant-coated polystyrene resin foam plate obtained in the same manner as in Example 1 was measured and found to be 0.7 KV. The contact angle of water was measured and found to be 54 °. Similarly, the surface resistivity was 2.4 × 10 ⁹ . Similarly to Example 1, an aqueous ethylene / vinyl acetate copolymer emulsion (Kanae Chemical Industry Co., Ltd., A-3400L, non-volatile content 55% ± 2%) was tried to be applied using a quarter roll. Pre-coated polystyrene resin foam board is slippery when fed out, causing poor feeding, and it is impossible to balance with the supply of paper to be laminated. There wasn't.

[Comparative Example 3]
A surfactant was not applied to a polystyrene foam plate (density 0.066 g / cm ³ , thickness 7 mm, width 630 mm, length 930 mm), and the charge amount of the polystyrene resin foam plate was measured as in Examples 1 and 2. However, it was 5.0 KV. The contact angle of water was measured and found to be 85 °. Similarly, the surface specific resistance was 1.6 × 10 ¹⁶ . As in Examples 1 and 2, an ethylene / vinyl acetate copolymer aqueous emulsion (Kanae Chemical Industry Co., Ltd., A-3400L, non-volatile content 55% ± 2%) was added 36 g per m ² using a quarter roll ( One side) was applied, and Kent paper was applied using a pressure roll. Since the amount of the adhesive is larger than in Example 1, Example 2 and Comparative Example 1, the texture is wet immediately after application, and after 2 days of air drying, drying is still insufficient, and after 3 days of air drying A display board for Comparative Example 3 was obtained.

  For this display board, the peel strength in the flow direction and the width direction was measured in the same manner as in Example 1. As a result of the obtained peel strength, the integral average value in the flow direction is 1670 g / f, the width direction is 1647 g / f, and the minimum point load is 988.3 g / f in the flow direction and 466.5 g / f in the width direction. Although it was sufficiently adhered, it was determined that there was a problem because some of the paper wrinkles associated with the use of a large amount of adhesive were observed.

  Table 1 summarizes the results of evaluating the mounts of these examples and comparative examples. From the table, if it is a display board of polystyrene resin foam board having an application surface of an adhesive containing a surfactant, the adhesive is applied in a uniform state over the entire surface of the foam board, It can be seen that the thickness can be easily uniformed and stable adhesiveness can be obtained with a smaller amount of adhesive.

(Water contact angle measurement method)
In addition, the contact angle at the time of dripping the water of the polystyrene-type resin foam board which surface-treated the surfactant was measured by the droplet method using the solid-liquid interface analyzer DropMaster300 (made by Kyowa Interface Science Co., Ltd.). The dropping solution was water, the liquid volume was 0.5 μL, and the contact angle was calculated by the θ / 2 method.

(Measurement method of surface resistivity)
The surface specific resistance of the thermoplastic resin foam board surface-treated with the surfactant was measured by the method described in JIS K6911: 1995 “General Test Method for Thermosetting Plastics”. That is, using a test device (advantest digital ultra-high resistance / microammeter R8340 and resiliency chamber R12702A), an electrode is crimped to a sample sample with a load of about 30 N, and the resistance after charging for 500 V for 1 minute. The value was measured and calculated by the following formula. The sample sample was 100 × 100 × 7 (total thickness) mm.
Ps = π (D + d) / (D−d) × Rs
Ps: Surface resistivity (MΩ)
D: Inner diameter (cm) of the annular electrode on the surface
d: outer diameter of inner circle of surface electrode (cm)
Rs: Surface resistance (MΩ)

(Measurement method of charge amount)
After the polystyrene resin foam board to be measured is stored in a room maintained at a temperature of 23 ± 2 ° C. and a humidity of 60 ± 5% for 24 hours, the surface is measured using an electrostatic potential measuring device (“Statilon DZ3” manufactured by Sicid Electrostatic Co., Ltd.) The amount of charge was measured from a portion separated by 100 mm. Measurements were made at 10 arbitrary locations in the width direction, and the arithmetic average value was taken as the charge amount.

(Adhesive evaluation)
The adhesiveness between the foam board and the paper in the display mount was evaluated by peel strength.
The peel strength was measured according to the 180 ° peeling method based on JIS Z-0237 (1980). The display board to be measured is stored in a room maintained at a temperature of 23 ± 2 ° C. and a humidity of 60 ± 5% for 24 hours, and then a test piece having a length of 100 mm and a width of 25 mm is cut out from one end in the longitudinal direction of the test piece. The laminated paper is peeled 5 mm over the entire width (25 mm) and folded back 180 °. Next, the foamed plate part from which the paper has been peeled is sandwiched between the lower clamps and fixed. Hold the folded part of the paper with the upper clamp. The upper clamp is pulled up at a speed of 200 mm / min, and the load is recorded with a self-recording recorder. The measurement is performed until all of the measurement is removed from the position where it has been removed 5 mm after being pulled up. The integrated average load value is obtained from the load curve recorded from the start of measurement until it is completely removed from the position excluding the first 5 mm. The minimum point load value is the minimum load value recorded within the measurement range.

  A Tensilon universal testing machine (manufactured by Orientec Co., Ltd., UCT-10T) was used as a load measuring device. FIG. 5 is a schematic diagram of the main part of the measurement apparatus, and FIG. 6 is a conceptual diagram of the measurement result, illustrating a method for specifying the integrated average load from the graph.

The evaluation standard is preferably an integral average load value of 200 g / f or more. Those having a weight of less than 200 g / f have poor adhesiveness, and the paper tends to peel off from the end. Moreover, the thing whose minimum point load value of peeling strength is 100 g / f or more is preferable. What is less than 100 g / f is easily peeled off partially when it is cut. It is preferable that the integral average load value of the peel strength is 200 g / f or more and the minimum point load value of the peel strength is 100 g / f or more.
In addition, these evaluation methods cut out five test pieces in each of the long side direction (MD) and the short side direction (TD) from any part of the display board, and measure the peel strength by the above method for each. For the integrated average load value, the arithmetic average value of these five values was used as the peel strength of the display board in each direction. About the minimum point load value, the minimum thing of the minimum point load values of each of five test pieces was made into the minimum point load value.
Table 1 shows these results by the following ○ ×.
○: Integrated average load value of 200 gf or more and minimum point load value of 100 gf or more ×: Integrated average load value of less than 200 gf or less than minimum point load value of 100 gf

(Defect on the adhesive surface)
As for the surface state of the bonded portion, the paper surface was carefully peeled off so as not to cause material destruction, and the adhesion of the adhesive was confirmed using a microscope VH-5000 manufactured by KEYENCE, and defects occurring on the bonded surface were confirmed.

  The exhibition mount of the present invention can be used as a mount for directly printing an advertisement on the surface of a foamed plate or attaching a printed matter such as an advertisement or a photograph.

It is a schematic sectional drawing of the mount for exhibition which shows one Embodiment of this invention. 2 is a 50 × magnified photograph of the peeled surface of Example 1. FIG. It is the same enlarged photograph of the Example 2. It is the same enlarged photograph of the comparative example 1. FIG. 3 is a schematic side view showing the concept of the surfactant coating apparatus. FIG. 4 is a schematic view showing a bonding apparatus. FIG. 5 is a schematic view of a measuring apparatus in the peel strength measuring method. FIG. 6 is a schematic view of a measurement result in the peel strength measurement method.

Explanation of symbols

10 Display Mount 100 Polystyrene Resin Foam Board 101 Surfactant 102 Adhesive 103 Paper

Claims (5)

In the manufacturing method of the mount for exhibition which attaches paper, after apply | coating an aqueous adhesive to the front and back of a polystyrene-type resin foam board with a density of 0.13-0.042g / cm < ³ > and an open cell rate of 15% or less ,
An aqueous solution containing a surfactant is previously applied to the surface of the polystyrene resin foam plate to which the water-based adhesive is applied so as to be 10 to ²⁰ g / m ^2, and the surface on which the surfactant is applied is contacted with water. The angle is in the range of 55 ° to 80 °, the charge amount is in the range of ± 3 KV,
Thereafter the water was allowed to volatilize the foam board remaining surfactant, wherein the aqueous adhesive ^{10~30g / m 2 (5~18g / m} 2 as a nonvolatile component) is applied, that is affixed to the paper A method for manufacturing a mounting board for display. The paper has a basis weight of 30 to 150 g / m. ² The manufacturing method of the mount for exhibition of Claim 1 which is. The method for producing a display board according to claim 1 or 2, wherein the polystyrene-based resin foam plate is a foam plate in which a concave hole having a diameter (diameter) of an opening of 25 µm or more and less than 100 µm is formed. The recessed holes are 20/4 mm per unit area of the adhesive application surface. ² The manufacturing method of the mount for exhibition of Claim 3 which has it in the above ratio. The surfactant is an aliphatic soap, N-acyl amino acid salt, alkyl ether carboxylate, alkyl sulfonate, alkyl benzene sulfonate, alkyl naphthalene sulfonate, sulfosuccinate or α-olefin sulfonate. The manufacturing method of the mount for exhibition of Claim 1.