JP5872991B2 - Composite sheet, composite sheet manufacturing method, and article container - Google Patents

Description

  The present invention relates to a composite sheet, a method for producing the composite sheet, and an article container using the composite sheet. In particular, the present invention relates to a composite sheet having a non-woven fabric on the surface of the sheet and performing offset printing to have a versatile function, a method for manufacturing the composite sheet, and an article container.

  A composite sheet that is made by laminating a plurality of sheets and films each having a unique function is already known. Usually, another sheet or film is stuck on a base sheet that functions as a base plate (mounting paper). Each sheet or film can be used to perform unique functions that cannot be obtained. Among such composite sheets, there is one in which a nonwoven fabric is used as one element of the constituent sheet. Nonwoven fabrics are commonly found in daily life. Nonwoven fabrics are used, for example, as outer shell packaging sheets for disposable body warmers, flower tobacco packaging paper, and clothing covers. As a packaging material, a multifilament yarn made of a thermoplastic polymer is deposited in a random direction on a nonwoven fabric made of a core-sheath type composite fiber made of a thermoplastic polymer, and integrated into a sheet by thermocompression bonding. Is known (Patent Document 1).

In addition to wrapping paper, general posters, advertising flyers, direct mail, brochures, covers for books and magazines, etc. are printed. In addition to visibility such as clarity, It is required that the print surface does not deteriorate or fade due to contact wear. For example, as a display sheet to be applied to the outdoor asphalt road surface, the platform floor surface in the station premises and the outer wall of the building, an ink layer that covers the convex portion and penetrates into the concave portion is formed on the surface of the base material having the concave and convex surface, A display sheet in which an adhesive layer for adhering to an object on the back surface of a base material is also disclosed (Patent Document 2).
In addition, a wrapping paper material is also disclosed in which a backing is pasted on one side of a nonwoven fabric made of vegetable fiber pulp, the other side of the nonwoven fabric is printed by multicolor printing, and the plant fibers on this printed surface are brushed with printing ink. (Patent Document 3).

JP 2007-118229 A JP 2010-181700 A Japanese Patent No. 3050868

  Nonwoven fabrics have various advantages over woven and knitted fabrics in which warp and weft yarns are woven, but the nonwoven fabric alone lacks rigidity and its use is limited in this respect. In particular, it is difficult to perform clear printing on the surface of the nonwoven fabric, and is not suitable for offset printing that can be printed simply and inexpensively. In order to perform clear printing on the nonwoven fabric, it is necessary to form a special protective film or protective layer on the surface of the nonwoven fabric. Moreover, although it is somewhat inferior in tensile strength compared with a woven or knitted fabric, and is excellent in heat retention and flexibility, it is said to be relatively weak in water resistance.

  The present invention has a unique aesthetic appearance on the sheet surface and an excellent texture, texture, and non-slippery as well as the advantages of the nonwoven fabric, and has a high tensile strength as a whole, and performs a clear offset printing on the surface of the nonwoven fabric. Therefore, it is an object of the present invention to provide a composite sheet excellent in robustness, further waterproofing and shape retention, and a method for producing the same.

  In the present invention, when printing is performed on the surface of the sheet, the portion where the printing pressure is applied, such as a pattern or printing, is locally concave, and the texture and non-slip properties are excellent in texture such as embossing It is intended to provide a composite sheet that can be applied in various ways, such as packaging sheets, storage bags, cosmetic boxes, article covers, pamphlets, postcard papers, noun papers, and the like, and its manufacturing method. It is.

  Another object of the present invention is to provide an article container using the composite sheet.

According to the present invention, the composite sheet is provided in the synthetic resin of a hard flexible substrate surface of the sheet through the thin film, characterized in that bonded nonwoven fabric.

  According to another aspect of the present invention, there is provided a composite sheet that is offset printed on the upper surface of the nonwoven fabric. As simple and inexpensive offset printing is possible, it can be used as a confectionery box, cosmetic box, design card, brochure, etc. that has a printed surface with any indication or non-woven fabric flavor (feeling of touch, prevention of hand slipping when handling, etc.) Wide use is possible.

  According to another aspect of the present invention, there is provided a composite sheet, wherein the hard flexible base sheet is formed of polypropylene or polyethylene terephthalate having a thickness of 0.1 to 0.7 mm. Thus, if the base sheet is made of a synthetic resin polymer, the outer surface is the nonwoven fabric side, and the inner surface (back surface) is the base sheet side to form a box or bag body. A packaging box and a packaging bag can be constructed.

  According to another aspect of the present invention, there is provided a composite sheet, wherein the thin film is a polyethylene film. As a result, the non-woven fabric is easily and firmly bonded, and the composite sheet is strong and does not peel or tear.

According to still another aspect of the invention, there is provided a composite sheet, wherein the nonwoven fabric is a polypropylene or polyester nonwoven fabric having a basis weight of 20 g / m ² and a thickness of 0.1 to 0.5 mm. Stable and clear offset printing is ensured by using a non-woven fabric having such a form and having short hairs.

Method of manufacturing a composite sheet according to the present invention, a thin film to a rigid flexible substrate sheet made of synthetic resin and adhering with an adhesive, on the thin film on the hard flexible base sheet A step of adhering a non-woven fabric to the substrate, and a step of feeding the composite of the hard flexible base sheet, the thin film and the non-woven fabric while applying pressure.

  According to another aspect of the present invention, there is provided a method for producing a composite sheet, wherein the step of feeding the composite while pressurizing includes a step of performing offset printing while applying a high printing pressure. Since simple and inexpensive offset printing is possible, it is widely used as a confectionery box, cosmetic box, design card, pamphlet, etc. that has a printed surface with a non-woven-flavored outer surface (feeling of touch, prevention of hand slipping during handling, etc.) It becomes possible.

  According to another aspect of the present invention, there is provided a method for producing a composite sheet, wherein the hard flexible base sheet is polypropylene or polyethylene terephthalate having a thickness of 0.1 to 0.7 mm. Thus, by making the base sheet into a synthetic resin polymer, if the box is formed with the outer surface on the non-woven fabric side and the inner surface (back side) on the base sheet side, the inside of the box is made waterproof. Boxes and packaging bags can be configured.

  According to another aspect of the present invention, there is provided a method for producing a composite sheet, wherein the thin film is a polyethylene film. As a result, the non-woven fabric can be easily and firmly bonded, and a composite sheet that is strong and does not peel or tear can be obtained.

According to another aspect of the present invention, there is provided a method for producing a composite sheet, wherein the nonwoven fabric is a polypropylene or polyester nonwoven fabric having a basis weight of 20 g / m ² and a thickness of 0.1 to 0.5 mm. Stable and clear offset printing is ensured by using a non-woven fabric having such a shape and having short hair legs.

According to the present invention, the synthetic resin rigid flexible substrate surface of the sheet through the thin film is formed of a composite sheet obtained by bonding the nonwoven fabric so that the nonwoven fabric of the composite sheet becomes an outer surface side An article container is provided which is formed in a bag shape or a box shape. In addition, a packaging bag, a storage bag, a packaging box, a storage box, etc. are called an article storage tool here.

According to another aspect of the present invention, there is provided an article container characterized in that offset printing is performed on the outer surface of the nonwoven fabric of the composite sheet. Since simple and inexpensive offset printing is possible, the confectionery box, cosmetic box, and various storage bags that have a printed surface with an arbitrary display and non-woven fabric flavor (feeling of touch, prevention of hand slipping during handling, etc.) on the outer surface Can do.
Since the outer surface of the article container is a non-woven fabric, the outer surface becomes a rough surface, and there is no risk that the article slips and drops when handling, and the inner surface of the article container is a smooth surface of the base sheet. Therefore, wiping and cleaning the inner surface of the container is also facilitated.

  In the composite sheet according to the present invention, since the nonwoven fabric is pressure-bonded onto a hard and flexible base sheet through a thin film, a composite sheet having a good texture and texture can be obtained. The hard base sheet functions as a reinforcement, has no unnecessary elongation or breakage, and becomes a non-woven fabric with a rough surface or outer surface, so that it does not slip out of the hand when used as the packaging bag or storage box. . Moreover, since the inner surface of the said container becomes a smooth base material sheet, even if an inner surface becomes dirty, it becomes easy to wipe off.

  Furthermore, since the nonwoven fabric is backed by a hard base sheet, it is possible to perform clear offset printing on the nonwoven fabric, and the nonwoven fabric portion is embossed due to the printing pressure during printing. The back side is a composite sheet that is water and water resistant.

It is sectional drawing of the composite sheet which concerns on Example 1 of this invention. It is the schematic which shows the offset printing process in the case of printing on the composite sheet which concerns on this invention. It is a perspective view perspective view of the handbag accommodation bag using the composite sheet which concerns on Example 2 of this invention. It is a perspective view of the storage box using the composite sheet which concerns on Example 3 of this invention. It is a top view which shows one example of the nonwoven fabric printing surface of the composite sheet which concerns on Example 4 of this invention.

  Next, various embodiments will be described with reference to the drawings.

As shown in FIG. 1, the composite sheet 1 according to Example 1 is a polyethylene for improving the adhesion of a nonwoven fabric to the surface of a base sheet 2 having a thickness of about 0.1 to 0.7 mm of polypropylene or polyethylene terephthalate serving as a mount. A thin film 3 such as a film is adhered with a polyurethane adhesive, and a nonwoven fabric 4 is adhered to the upper surface of the thin film 3 to form a three-layer laminate 6. It has a structure in which a printing surface 5 is formed by offset printing under pressure. The base sheet 2 is harder than the upper layer nonwoven fabric and has flexibility. In this Example 1, the nonwoven fabric 4 is configured as a three-dimensional fiber assembly in which polypropylene fibers are randomly dispersed and bonded or mechanically entangled. The nonwoven fabric 4 is selected as short as possible in consideration of offset printing in the final process. In this case, the polypropylene nonwoven fabric 4 has a thickness of 0.1 to 0.5 mm and a basis weight of 20 g / m ² . Other mechanical properties are: tensile strength (N / 5cm) length 70, width 20, breaking elongation (%) length, width 17 both, tear strength (N) length 9, width 21, air flow ( cc / cm ² · sec) is 210.

  The reason why the thickness of the base sheet 2 is about 0.1 to 0.7 mm is that the composite sheet 1 has a thickness suitable for workability to postcards, handbags, storage boxes, and the like, which will be described later. Therefore, the thickness of the base material sheet 2 is not limited to this, and may be a sheet having a thickness that can be applied to a printing machine, and is appropriately selected depending on properties required for a molded product. For example, as the polypropylene / polyethylene terephthalate, offset printing can be performed if it is 12 μm or more. The nonwoven fabric employed in the present invention is not limited to the above-mentioned polypropylene, but may be a polyester nonwoven fabric or other nonwoven fabric having similar properties. Moreover, the thickness, basis weight, and other mechanical properties of the nonwoven fabric are not limited to those described above.

  The laminate 6 composed of the base sheet 2, the thin film 3, and the nonwoven fabric 4 is subjected to a pressurizing step and stretched into a sheet shape. Offset printing is performed on the upper surface of the sheet-like laminate 6, that is, on the surface of the nonwoven fabric 4. In this case, the nonwoven fabric 4 on the upper surface of the laminate is formed into a nonwoven fabric with short hairs. FIG. 2 shows an offset printing process employed in the present invention. In this case, four colors of ink are printed with a UV printing machine 90 with a printing pressure higher than usual, and then cured by UV irradiation. As shown in the figure, the fountain solution layer supplied from the fountain solution supply device 91 and the printing ink layer from the ink supply device 92 are on a plate cylinder 93 having an oleophilic image portion and a hydrophilic non-image portion. Formed, the printing ink adheres to the oleophilic portion, and the printing ink is transferred to a blanket cylinder 94 that rotates in contact with the plate cylinder 93. Then, printing is performed on the nonwoven fabric surface of the sheet-like laminate 6 that is fed between the blanket cylinder 94 and the impression cylinder 95.

  In the present invention, pressure is applied at the stage of forming the sheet-like laminate, and a strong printing pressure is applied to the sheet-like laminate even between the blanket cylinder and the impression cylinder in the offset printing process. In this way, a composite sheet on which high-grade and clear printing is performed can be obtained by applying pressure at the stage of forming a laminate with short hairs and the stage of offset printing.

  The above-described composite sheet is cut into a required size and formed into, for example, a noun, a postcard, a pamphlet, or the like, and can be assembled into a three-dimensional shape to form a handbag, a storage box, a small case, or the like, that is, an article storage device. FIG. 3 shows an example in which a handbag 10 which is an example of an article container is configured with the composite sheet described in the first embodiment. The side portion and the bottom portion that form the outer surface 11 are bonded to each other with an adhesive, and the strap 13 is attached to the upper opening 12. In this case, the printing surface, that is, the nonwoven fabric portion is configured to be on the outside. As a result, the texture of the appearance is improved and the outer surface is rough due to the nature of the non-woven fabric, so that it is possible to avoid holding the bag by hand during handling or sliding the bag even when it is placed on the knee. In addition, since the inner surface of the bag 10 is a hard and smooth base material sheet surface 15 of polypropylene / polyethylene terephthalate, waterproofness is ensured, and even if the bag inner surface becomes dirty due to water-containing contents, it is easily wiped off. be able to. Furthermore, both the base sheet and the nonwoven fabric have a higher tensile strength than a general paper bag and are not torn. In particular, when printing non-woven fabrics, the part where the printing pressure is applied becomes locally concave, resulting in an embossed wind, which also increases the strength and can be torn even with heavy objects. Is prevented.

  FIG. 4 is a perspective view of a container box (article container such as a confectionery box, a cosmetic box, and an accessory case) 20 with an open / close lid formed by the composite sheet according to the present invention shown in the first embodiment. Also in this case, by making the non-woven fabric of the printing surface become the outer surface 21 of the box 20, it becomes difficult to slip from the hand at the time of use, and the inner surface 22 of the box 20 becomes the aforementioned base material sheet surface. In addition, when Western confectionery, raw confectionery, raw food, or the like is placed, it becomes easy to clean the interior even when the inside of the box becomes dirty with these items. Further, as in the case of the handbag of the second embodiment, the waterproofness of the inside is ensured, the strength is high, and the shape is hardly deformed. As a modification of Example 3, the outer surface of the box can be a base sheet, and the nonwoven fabric can be placed inside the box. For example, when storing jewelry or other accessories or information equipment media for a long period of time, the inner surface of the box is rough, so that even if the stored item is left in contact with the inner surface of the box for a long period of time. Therefore, it is possible to prevent the contents from being fixed to the inner surface of the box and to cause deterioration of the contents.

  FIG. 5 is a plan view illustrating the printing surface offset-printed on the nonwoven fabric of the composite sheet 30. By using a non-woven fabric with a hardness that is secured by the base material sheet and short hairs, a clear and well-colored offset printing surface can be obtained.

  In the above-described embodiments, examples in which the base sheet is formed of a synthetic resin polymer such as polypropylene / polyethylene terephthalate are shown. However, the base sheet is also a relatively hard and flexible cardboard. Or the like. The application example of the above composite sheet is just one example. In addition to this, the cover of small portable communication equipment, the warmer packaging sheet, the bouquet packaging sheet, the costume cover, and other posters and magazines that make use of the surface slip resistance Various applications such as a cover are possible.

  Thus, according to the composite sheet of the present invention and the method for producing the composite sheet, it is possible to provide a sheet body capable of performing clear and good color offset printing on the surface of the nonwoven fabric. Therefore, the composite sheet of the present invention having a base sheet, non-woven fabric, and a clear and well-colored printing layer is excellent in robustness combined with excellent texture, touch and non-slip properties with unique aesthetics brought about by non-woven fabric and printing. Synergistic effects such as water resistance, waterproofness, strength and shape retention.

DESCRIPTION OF SYMBOLS 1,30 Composite sheet 2 Base material sheet 3 Thin film 4 Nonwoven fabric 5 Printing surface 6 Laminate body 10 Handbag 11 Inner surface 12 Upper opening 13 Led string 15 Base material sheet surface 20 Storage box 21 Outer surface of storage box 22 Inner surface of storage box 90 UV Printing machine 91 Dampening water supply device 92 Ink supply device 93 Plate cylinder 94 Blanket cylinder 95 Impression cylinder

Claims (7)

In the state where a polyethylene film is adhered to the surface of a base material sheet made of either a polypropylene sheet or a polyethylene terephthalate sheet, and the nonwoven fabric is stuck on the polyethylene film, offset printing is performed on the upper surface of the nonwoven fabric. A composite sheet which is cured by UV irradiation .   The composite sheet according to claim 1, wherein the polypropylene sheet or polyethylene terephthalate sheet is formed of polypropylene or polyethylene terephthalate having a thickness of 0.1 to 0.7 mm. The composite sheet according to claim 1, wherein the nonwoven fabric is a polypropylene or polyester nonwoven fabric having a basis weight of 20 g / m ² and a thickness of 0.1 to 0.5 mm.   A step of adhering a polyethylene film with an adhesive to a base material sheet made of either a polypropylene sheet or a polyethylene terephthalate sheet, a step of adhering a nonwoven fabric on the polyethylene film on the base material sheet, and the base material sheet, A method for producing a composite sheet, comprising a step of applying offset printing while applying pressure while feeding a laminate of the polyethylene film and the non-woven fabric, and curing by UV irradiation.   5. The method for producing a composite sheet according to claim 4, wherein the polypropylene sheet or polyethylene terephthalate sheet is polypropylene or polyethylene terephthalate having a thickness of 0.1 to 0.7 mm. The method for producing a composite sheet according to claim 4 or 5, wherein the nonwoven fabric is a polypropylene or polyester nonwoven fabric having a basis weight of 20 g / m ² and a thickness of 0.1 to 0.5 mm. In the state where a polyethylene film is adhered to the surface of a base material sheet made of either a polypropylene sheet or a polyethylene terephthalate sheet, and the nonwoven fabric is stuck on the polyethylene film, offset printing is performed on the upper surface of the nonwoven fabric. An article container characterized by being cured by UV irradiation .