JPS6120423B2 - - Google Patents

Description

Detailed Description of the Invention The present invention involves laminating a synthetic resin containing a foaming agent on the surface of a base material made of paper, cloth, etc., preheating it, and using an embossing roll to create a fine, acute-angled uneven pattern on the entire surface. Then, by printing a desired pattern on this with printing ink containing a foam inhibitor, and further heating and foaming, the foam inhibitor printed area remains as a fine, acute-angled uneven pattern, and the foam inhibitor is removed. This invention relates to a method for producing a foamed decorative material, characterized in that the unprinted areas are foamed, and the fine, acute-angled uneven patterns expand to form dew-like uneven parts that are 2 to 3 times rounder. .

Conventionally, the method for producing foamed decorative materials with uneven patterns involves forming a coating film of synthetic resin containing a foaming agent on a base material, gelling it by heating at a temperature below the decomposition temperature of the foaming agent, and then applying the coating. After printing a desired pattern on the surface of the membrane with a printing ink containing a foaming inhibitor, heat treatment is performed below the decomposition temperature of the foaming agent to foam the areas where the printing ink containing a foaming inhibitor has not been applied, forming the printed pattern. A so-called chemical embossing method, which is a method for producing a foamed decorative material having a concavo-convex pattern that matches the above, is known.

However, although foamed decorative materials using this chemical embossing method can be made with various patterns, they lack depth in appearance, and are particularly difficult to create with fine uneven patterns with acute angles, or where the boundaries between concave and convex parts are reversely tapered, right-angled, etc. It was impossible to do so.

This is because the foaming inhibitor cannot exhibit its inhibitory effect unless it is printed in a certain amount or more, so if the printed area is small, the areas that should become recesses are not sufficiently suppressed during the heating and foaming process, resulting in foaming. Even if it were suppressed, the printing area was so small that only gentle depressions could be formed, and the appearance lacked depth as a decorative material.

In addition, as a manufacturing method for foamed decorative materials having an uneven pattern, a coating film of a synthetic resin containing a foaming agent is formed on a base material, dried to form a gel, and then preheated at a temperature below the decomposition temperature of the foaming agent, followed by embossing. Forming a fine uneven pattern on the synthetic resin layer using a roll, further heating and foaming to expand the uneven pattern 2 to 3 times, and then preheating again at a temperature at which the foamed uneven pattern does not melt and disappear; A so-called secondary embossing method is known in which an embossing roll is used to partially crush the uneven portion of the foam to form a flat surface.

The foamed decorative material produced by this method only has a pattern formed by the rounded dewdrop pattern-like concave and convex portions formed by foaming and the concave portions that are crushed and flattened by the secondary embossing, but the appearance is limited. Although it has depth, it is slow to change, and because it is impossible to match the printing ink and the uneven pattern, it is only possible to manufacture patterns with simple structures.

In addition, in addition to the foaming heat treatment, preheating is repeated twice, which causes thermal deterioration of the synthetic resin layer and the base material, impairing its function as a decorative material in terms of strength.

The purpose of the present invention is to eliminate the drawbacks of these conventional methods, and to create a beautiful appearance that has depth in appearance and has both an unfoamed micro-acute-angled uneven pattern that matches printing and a rounded dewdrop-shaped foamed uneven pattern. An object of the present invention is to provide an excellent foam decorative material.

The present invention will be explained below based on the drawings.

In Figure 1, a synthetic resin paste 2 of a desired color containing a foaming agent is applied onto the surface of a paper or cloth base material 1 using a coating doctor 3 or a roll coater, and the paste is maintained at a predetermined temperature below the foaming agent decomposition temperature. The synthetic resin paste is passed through a drying chamber 4 to gel, and a coating layer 5 is provided on the entire surface. Next, the coating layer 5 is preheated by being passed under a preheating device 6 set at a temperature below the blowing agent decomposition temperature, and the coating layer 5 is embossed by an embossing roll device 7 to give a fine uneven pattern 8 having acute angles to the entire surface. do. Next, using a gravure printing machine 9 or a rotary screen printing machine, a desired printing pattern is printed in multiple colors on the fine uneven pattern resin layer 8 using a printing ink containing a foaming inhibitor and a normal printing ink. After surface treatment is performed using a surface treatment machine 10 to adjust the surface gloss, the foam is passed through a foaming furnace 11 set at a temperature of approximately 230°C to foam the foaming agent contained therein, and then cooled using a cooling roll 13. Manufactures foam decorative materials.

As a result of this foaming and heating, the portions printed with the printing ink containing the foaming inhibitor remain as the acute-angled fine uneven pattern 8 obtained by embossing, and the portions where the printing ink containing the foaming inhibitor is not printed remain. is foamed, and the pattern which had an acute uneven pattern before foaming expands 2 to 3 times to form a rounded dewdrop-like uneven pattern 12.

The foamed decorative material obtained in this way has a desired pattern of an unfoamed acute-angled fine unevenness pattern portion 8 and a foamed rounded dewdrop-like unevenness pattern portion 12, and is also compatible with printing ink. Matched foam decoration material. In addition, this method allows multicolor printing and provides foamed decorative materials that cannot be obtained using conventional valley dyeing methods.

In the conventional chemical embossing method, as shown in Figure 2, the foamed part has a plano-convex surface A, and the unfoamed part B only has a plano-concave surface, and the areas of the plano-concave surface B and plano-convex surface A are made smaller. That was impossible.

In addition, in the secondary embossing method, the foamed part A becomes a rounded dewdrop shape as shown in Figure 3, but the part crushed by the secondary embossing only has a flat and concave surface B, and moreover, it does not match the printed pattern. It was not possible to match the uneven patterns.

As shown in Figure 4, the foamed decorative material obtained by the method of the present invention has a fine uneven pattern B with acute angles in the unfoamed part, and a dewdrop-like uneven pattern with rounded acute angles in the foamed part. Furthermore, since two types of uneven patterns matching the multicolored printed pattern can be obtained, the appearance is rich in depth and excellent in aesthetic appearance. Furthermore, when performing embossing with an embossing roll device, if the shape of the embossing roll used is made into a reverse tapered fine uneven pattern, it is possible to create foam decorations with an inverted tapered uneven pattern that cannot be obtained with the chemical embossing method. material can be manufactured.

In the present invention, what is referred to as a foaming inhibitor has the effect of hindering the action of a stabilizer that has a foaming promoting effect and is mixed in advance into the foaming agent-containing synthetic resin layer.For example, as a foaming promoting stabilizer, There are organozinc compounds, and their inhibitors include benzotriazole. The organozinc compound serves to lower the decomposition temperature of the blowing agent, and the benzotriazole serves to substantially eliminate this action of the organozinc compound, resulting in a substantially higher decomposition temperature of the blowing agent. Therefore, by controlling the temperature and time of the foaming heat treatment, the areas to which the foaming inhibitor has been applied and the areas to which it has not been formed will become non-foaming areas and foaming areas, resulting in differences in thickness. There are many combinations of foam promoting stabilizers and foam suppressing agents, as detailed in Japanese Patent Publication No. 47-27794.

〔Example〕

Formulation table (parts are parts by weight) PVC 100 parts DOP 50 parts Stabilizer A (Zn-based) 1.0 parts Stabilizer B (organozinc compound) 1.5 parts Foaming agent (ADCA-based) 5 parts Calcium carbonate 20 parts Above compounding ratio After applying a synthetic resin paste with a thickness of 0.15 mm to the base material and drying it to gel, it is preheated at 130°C to 140°C, which is lower than the decomposition temperature of the blowing agent, to soften the synthetic resin layer and use a cold embossing machine. A fine, acute-angled uneven pattern is formed on the entire surface using

Next, add foam suppressant benzotriazole to 5-25%.
A multicolor pattern is printed using the containing printing ink and a normal printing ink.

The printing machine used for printing may be a gravure type or rotary screen type printer, but since the surface to be printed has fine irregularities, if possible, use a rotary screen type printer that can coat a large amount of ink. It is preferable to do so.

Next, the gloss of the surface was adjusted using a surface treatment machine, and then the synthetic resin layer was foamed in a foaming furnace set at about 230℃. The non-printed portion of the foam suppressor is foamed and has a rounded dew-like uneven pattern, and the printed pattern and the two types of uneven patterns match, giving the foam a deep appearance. Decorative material was obtained.

[Brief explanation of the drawing]

Figure 1 is a process diagram for carrying out the present invention. figure-
2 is an enlarged sectional view of an uneven pattern obtained by chemical embossing. Figure 3 is an enlarged cross-sectional view of the uneven pattern obtained by the secondary embossing method. figure-
4 is an enlarged sectional view of the uneven pattern obtained by the present invention. 1: Base material, 2: Synthetic resin paste, 3: Coating doctor, 4: Drying chamber, 5: Coating layer, 6: Preheating device, 7: Embossing roll device, 8: Fine uneven pattern, 9: Gravure printing machine , 10: Surface treatment machine, 11: Foaming furnace, 12: Dewdrop pattern, 1
3: Cooling roll, A: Convex pattern, B: Concave pattern.

Claims (1)

[Claims] 1. A foaming agent-containing synthetic resin layer laminated on a base material is preheated at a temperature lower than the decomposition temperature of the foaming agent, and an uneven pattern is formed on the synthetic resin layer via an embossing roll device, after which a foaming inhibitor is applied. A method for producing a foamed decorative material, comprising printing a desired pattern with a printing ink contained therein, and then foaming a foaming agent-containing synthetic resin layer.