JPH02191782A - Decorative sheet - Google Patents

Abstract

PURPOSE:To obtain a decorative sheet exhibiting beautiful appearance having uniform relief pattern by coating a surface of a spun-bond cloth with a coating agent using a gravure coater. CONSTITUTION:A surface of a spun-bond cloth is gravure coated with a coating agent produced by adding a pigment, filler, etc., to a coating agent such as cellulosic natural resin or vinyl chloride (co)polymer. The part having high density is exclusively coated by this process to obtain a beautiful decorative sheet having a relief appearance. The sheet is suitable as a packaging material or a raw material for envelope. etc.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a decorative sheet having a beautiful colored or non-colored amorphous pattern on two surfaces, which is suitable for decorating and protecting the surface of an object, or as a material for packaging an object. .

(Prior art) Sheet-like materials used as wallpaper, decorative paper, packaging materials for packaging daily goods such as medicines, medical instruments, foods, beverages, and clothing, or materials for postal envelopes. requires water resistance, strength and aesthetics. Japanese paper or sheet-like nonwoven fabric with high wet strength is used as the base material for such decorative sheets.

Particularly in recent years, there has been an increase in the use of spunbond sheets of plastic fiber nonwoven fabric produced by the spunbond method.3 These sheets are usually coated or printed to meet the needs of each application or for aesthetic purposes. It is used as a decorative sheet.

(Problems to be Solved by the Invention) Spunbond cloth is a cloth-like or paper-like sheet made by bonding a web in which filaments are randomly arranged at the intersections of the filaments. There are areas where the filaments intersect, i.e., areas with high density, and areas where the filaments intersect, i.e., areas with low density. However, depending on the manufacturing process, it can be observed that there is an extremely wide variety of shapes, such as feather-like shapes, spiral shapes, and natural stone mottled shapes.

When such spunbond fabrics are entirely or partially treated with dyes, paints, inks, varnishes, or other processing agents or coatings using normal dipping or coating methods, the hue will vary depending on the density distribution of the spunbond fabrics. This results in uneven gloss and gives a very dirty impression. Therefore, when adding decorations, it is best to avoid solid painted areas as much as possible in the design, or apply a sealant in advance, then dip or apply a treatment agent or coating agent, etc. The actual situation is that they are engaged in engineering, printing, etc.

(Means for Solving the Problem) The present inventors studied spunbond cloth coated with various coating agents, and found that the coating film in the dense areas was smooth and exhibited beautiful color and gloss. The low-density areas have a porous shape, and the coating material is applied to the inner surface of the pores to form an irregular coating film, so the amount of incident light is smaller than the high-density areas, and the reflected light is also directed in different directions. It was observed that the color was restricted and exhibited a dull color tone, resulting in an overall dirty and uneven surface.

Based on the above knowledge, the inventors conducted repeated research and found that
By the gravure printing method using a gravure plate! 1! By applying coating agents such as dyes, gravure inks, and varnishes to spunbond cloth, the coating film in areas with high density is smooth and develops a desired gloss and hue, but the coating film in areas with low density is coated. Almost no agent is applied and many beautiful matte white areas remain, resulting in various patterns such as feathers, spirals, and mottled patterns of natural stones such as marble, depending on the distribution shape of the dense areas of the spunbond fabric. Uses that require aesthetic appeal, such as wallpaper, decorative paper, and packaging materials for daily necessities such as pharmaceuticals, medical equipment, food, beverages, and clothing, and materials for postal envelopes that appear raised. They discovered that a useful decorative sheet could be obtained and completed the present invention.

The material and manufacturing method of the spunbond cloth used in the decorative sheet of the present invention are not specified, and the thickness and length of the filament may be arbitrarily selected, and the stretching method, presence or absence of a binder, type, etc. Optional. Furthermore, the thickness of the spunbond cloth is not limited as long as it can be selected depending on the purpose of the decorative sheet, and the material of the filament should also be selected appropriately depending on the purpose. Polyethylene terephthalate (PET), polyethylene, polypropylene Commercially available spunbond fabrics such as , nylon, etc. can all be used.

The coating material used in the decorative sheet of the present invention is not specified; it should be selected depending on the adhesion to the spunbond fabric and the required performance as a decorative sheet, as well as the conditions required for ordinary printing and coating. For example, cellulose-based, hard resin thread ring natural resin-based, vinyl chloride (co)polymer, acrylic (co)polymer, ethylene/vinyl acetate resin, modified polyethylene resin, modified polypropylene resin, polyester resin, Resin solutions and resin dispersions of known thermoplastic resins such as modified nylon resins and known thermosetting resins such as urethane resins, epoxy resins, thermosetting acrylic resins, oil-free alkyd resins, and amine resins, either alone or in combination of two or more. Examples include coating agents using a liquid or a solvent-free resin liquid as a vehicle.

In addition to pigments, fillers, etc., the coating material may optionally contain additives such as dispersants, leveling agents, lubricants, etc. which are commonly used in paints or printing inks.

In addition, clear paints that do not contain insoluble components such as pigments, fillers such as extender pigments, and erasers such as silica powder, or colorless coatings that contain extender pigments and matting agents but do not contain colored pigments, are also used. It is possible to create a beautiful decorative pattern by changing the gloss and other textures only in the denser parts of the spunbond cloth.

In addition, novel patterns can be formed by using coating materials containing metal pigments such as aluminum powder and plus powder, coating materials containing Burr pigments, and the like.

In the decorative sheet of the present invention, the coating material is applied using a gravure plate, but the gravure plate may be manufactured by a known method, i.e., an ordinary gravure plate, a net gravure plate, or a gravure plate by electronic engraving method. There is no particular limit to the screen density, but it is suitable for use between 80 and 250 lines, preferably between 120 and 1904 lines. It is. In addition, the depth of the gravure plate may be within the range of a normal gravure plate, and a range of several μ to 120 μ is appropriate.
Further, a range of 5μ to 50μ is preferable.

(Functions and Effects) The decorative sheet of the present invention is obtained by applying a coating agent to the surface of spunbond cloth using a gravure plate, but spunbond cloth is a web in which filaments are randomly arranged as described above. are bonded together at the intersections of filaments to form a cloth-like or paper-like sheet, and areas of high density and areas of low density exist irregularly.

When a coating is applied to the surface using a coater or the like, the coating material flows into areas with low density, giving a dirty appearance as if staining has occurred.

However, in the decorative sheet of the present invention, since the coating agent is applied to the surface of the spunbond cloth using a gravure plate, no printing pressure is applied to areas with low density, and therefore almost no transfer of the coating agent occurs. Only the denser areas are coated, creating a pattern that stands out and gives a beautiful appearance.

Hereinafter, it will be explained in more detail with reference to Examples.

``Example 1'' A gravure plate cylinder (depth 1
Brighton HIPAL-22 by 0μ, 1601)
A decorative sheet was produced by coating with 03 red ink (gravure ink for plastics manufactured by Kohon Ink Kagaku Kogyo ■).

The entire surface of the coated surface is colored red, but the areas where the density of the nonwoven fabric is high are notable for their density and luster.

The feather-like pattern rose to form a beautiful pattern.

[Comparative Example 1] In Example 1, the coating material was applied using a normal natural roll coater, the wet film thickness was adjusted to 8 μm, and a decorative sheet was produced by the same treatment.

Although the entire surface of the coated surface was colored red, the areas where the density of the nonwoven fabric was low were slightly darkened and the density seemed to be high, and the boundary surfaces of the pattern were unclear and a pattern that looked like dirt was formed.

[Example 2 In Example 1, AK was used as a spunbond nonwoven fabric.
S)+2050 (polyethylene nonwoven fabric manufactured by Asahi Kasei Kogyo ■) was used, and Brighton HIPAL-Z was used as the coating material.
805 black ink (gravure ink for plastics manufactured by Dainippon Ink and Chemicals) was coated with a gravure cylinder (depth 3μ, 16041 mm) to produce a decorative sheet.

The entire surface of the coating is colored in a light ink color, but the less dense parts of the nonwoven fabric are a matte, extremely pale grayish-white color, and the more dense parts appear gray and have a pattern similar to the markings of 5-treated stone. A decorative sheet was obtained.

(Comparative Example 2) In Example 2, the coating method was changed to a knife coater, and the wet film thickness was adjusted to 5 μm.

The surface of the obtained coated sheet was generally covered with a light ink color, but the less dense areas of the nonwoven fabric felt darker than the more dense areas, and no clear pattern was visible.

Claims (1)

[Claims] A decorative sheet characterized by coating the surface of spunbond cloth with a coating agent using a gravure plate.