JPH0646943U - Watermarked laminated polypropylene sheet - Google Patents

Abstract

(57) [Abstract] [Purpose] Watermark suitable for molding and processing molded products, especially polypropylene boxes and cases, which have a beautiful exterior and have a window through which the inside can be seen through. The present invention relates to a laminated laminated polypropylene sheet. [Construction] A watermark obtained by integrally molding a decorative sheet (A) made of crystalline polypropylene having a peep window (C) punched out and a transparent sheet (B) mainly made of crystalline polypropylene Included laminated polypropylene sheet.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a watermarked laminated polypropylene sheet, and more particularly, to a molded article having an exterior with excellent appearance and a window through which the inside can be seen through, especially a polypropylene box or case. It relates to a watermarked laminated polypropylene sheet suitable for molding.

[0002]

[Prior art]

 Conventionally, when products are lined up in a store as products, they are often displayed in a case so that they do not get dusty. Also, comparatively small items are displayed by hanging down the case in order to use the space meaningfully. In particular, stationery and small items are often displayed in a store in a transparent plastic case called a box.

[0003]

[Problems to be solved by the device]

 The product placed in the box is not touched by the buyer because it is not directly touched by the buyer, but the buyer can see what the contents are like. Similarly, the entire box must be made of a transparent sheet. However, since a transparent box is not aesthetically pleasing and tasteless, a pigmented sheet is used as a base for the box, and a peep window is provided so that the inside can be seen, and that part is transparent. A thick box or sheet (hereinafter referred to as a transparent base material) is used to make a box inside the box. However, in such a box-making product, the transparent base material is distorted and adhered, or the box-making base material and the transparent base material are bonded by an adhesive, which causes a step, resulting in a display at a store. Among them, there was a drawback that the product value was significantly impaired because dust entered in the gap due to the step.

The present invention has been made in view of these problems of the prior art, and its purpose is to provide a molded article having an aesthetic appearance and a peep window through which the inside can be seen, It is an object of the present invention to provide a watermarked laminated polypropylene sheet that can be obtained by a simple forming process such as a box.

[0005]

[Means for solving problems]

 In order to achieve the above object, the laminated polypropylene sheet with a watermark in the present invention is formed by punching the decorative sheet A to form a peep window C and completely filling the hole of the peep window C. And the transparent sheets B are laminated by integral molding. The decorative sheet A is made of crystalline polypropylene and has a beautiful appearance by adding a pigment. Further, crystalline polypropylene may be used as a base material and a cyclopentadiene-based petroleum resin may be blended, or crystalline polypropylene may be blended with a cyclopentadiene-based petroleum resin and an inorganic additive.

[0006]

[Action]

 Hereinafter, the operation and constitution of the watermarked laminated polypropylene sheet of the present invention will be described in detail with reference to the drawings, but the present invention is not limited to these drawings and the examples described later. FIG. 1 is a perspective view of a main part of a watermarked laminated polypropylene sheet of the present invention. The sheet is a laminate of a decorative sheet A and a transparent sheet B, which are punched to obtain a viewing window C, which are integrally formed. The decorative sheet A is obtained by using crystalline polypropylene as a raw material, adding a stabilizer, a pigment, and various additives known to be added to polypropylene, and subjecting it to extrusion molding and stretch molding. Generally, in order to give the sheet an aesthetic appearance, a suitable pigment may be blended, but by incorporating a cyclopentadiene-based petroleum resin and subjecting it to extrusion molding and stretch molding, a pearl-like brightness and a non-woven fabric are obtained. Such a sheet can be obtained, and a soft and high cushioning sheet can be obtained by blending a cyclopentadiene-based petroleum resin and an inorganic additive and subjecting them to extrusion molding and stretch molding.

FIG. 2 is a perspective view of an essential part showing the concept of manufacturing a watermarked laminated polypropylene sheet. The watermarked laminated polypropylene sheet guides the decorative sheet A, which is wound around the original roll 3 of the decorative sheet, between the laminating roll I5 and the laminating roll II6, and further melts to the same portion by the extrusion molding machine 1. The melt-kneaded product 2 of the kneaded transparent sheet composition was introduced, and the decorative sheet A and the transparent sheet B were integrally molded with these two rolls. At this time, if the decorative sheet A 1 is embossed by using the laminated roll I5 on which the leather pattern is engraved, the appearance can be further enhanced. Next, the integrated laminated sheet is subjected to thickness adjustment between the laminating roll II6 and the laminating roll III7 to obtain a laminated sheet having a desired thickness. The laminated sheet is wound by the laminated sheet winding roll 4. In addition, as a technical application example, an injection-molded product with excellent decoration such as edging and marking can be obtained by stacking inserts during injection molding, which is a product with a decorative sheet removed. It is also possible.

FIG. 3 is a perspective view of a main part of a box making machine using a watermarked laminated polypropylene sheet. The box is manufactured by processing a laminated polypropylene sheet into a box shape, having a viewing window C composed of a transparent sheet B on the front surface, and covering the remaining portion with a beautiful decorative sheet. .

FIG. 4 is a cross-sectional view of a main part of a box using a watermarked laminated polypropylene sheet. In the box, the outer layer is made of a decorative sheet A having an excellent appearance, and the inner layer is made of a transparent sheet B. The part where the transparent sheet B is exposed to the outside is a part corresponding to the viewing window C, and the inside of the box making machine can be viewed through this part. The thickness of the box is uniform.

FIG. 5 is a sectional view of a main part of a conventional box making machine. The box is made up of a pigment-added sheet D in which a part of the viewing window C is punched, and a rectangular transparent sheet B slightly larger than the viewing window C is attached to the adhesive E on the back side of the box. Are connected through.

The box-making using the watermarked laminated polypropylene sheet of the present invention is formed by the transparent sheet that constitutes the box-making body like filling the hole punched for the viewing window C of the decorative sheet A. Therefore, the transparent base material, which is a drawback of the conventional box making, is not distorted and adhered, and dust is not accumulated on the step between the box making base material and the transparent base material.

[0012]

【Example】

 Examples will be described with reference to the drawings. A decorative sheet A mainly made of crystalline polypropylene and a cyclopentadiene-based petroleum resin was stretch-formed to a thickness of 50 μm, and a decorative sheet was punched for a peep window C. It is wound around the anti-roll 3, and the roll 3 is attached to the manufacturing apparatus shown in FIG. Next, a transparent sheet composition mainly composed of crystalline polypropylene is melt-kneaded by an extrusion molding machine 1, and the obtained melt-kneaded product 2 of the transparent sheet composition is used as a laminating roll I5 and a laminating roll. It is led to the space between II6 and the laminated sheet of the decorative sheet A and the transparent sheet B is manufactured. The laminate was passed between a laminating roll II6 and a laminating roll III7 to obtain a watermarked laminated polypropylene sheet having a thickness of 500 μm, and the sheet was wound with a winding roll 4.

[0013]

[Effect of device]

 Since the present invention is configured as described above, it has the following effects. Since the watermarked laminated polypropylene sheet according to claim 1 is formed by integrally molding a transparent sheet B and a decorative sheet A, which has an excellent appearance, in which a portion to be a viewing window C is punched, the laminated sheet is The molding process is very simple, the appearance is beautiful, and it is very effective for obtaining products that need to look inside.

In the watermarked laminated polypropylene sheet according to claim 2, the decorative sheet A is a cavity-containing stretch-molded product in which a crystalline polypropylene is blended with a cyclopentadiene-based petroleum resin and which is subjected to extrusion molding processing and stretch molding processing. Therefore, a sheet having a pearl-like brightness and a non-woven fabric pattern can be obtained.

In the watermarked laminated polypropylene sheet according to claim 3, the decorative sheet A is a crystalline polypropylene in which a cyclopentadiene-based petroleum resin and an inorganic additive are blended, and a cavity containing an extrusion molding process and a stretch molding process is performed. Since it is a stretch-molded product, a soft and highly cushioned sheet can be obtained.

The box made by processing the watermarked laminated polypropylene sheet according to claim 4 is composed of one laminated sheet including the observation window C. Since the transparent sheet B is not bonded to the back side of the pigment-added sheet D in which the window C has been punched through the adhesive E, the strength is strong, and the transparent sheet is not deformed such as distorted or loosened, and is not used as a decorative sheet. There is no need to worry about dust or dust accumulating on the level difference with the transparent sheet.

[Submission date] May 11, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

FIG. 2 is a perspective view of an essential part showing the concept of manufacturing a watermarked laminated polypropylene sheet. The watermarked laminated polypropylene sheet guides the decorative sheet A, which is wound around the original roll 3 of the decorative sheet, between the laminating roll I5 and the laminating roll II6, and further melts to the same portion by the extrusion molding machine 1. The melt-kneaded product 2 of the kneaded transparent sheet composition was introduced, and the decorative sheet A and the transparent sheet B were integrally molded with these two rolls. At this time, if the decorative sheet A is embossed with a laminated roll I5 having a leather pattern engraved on it, the appearance can be further enhanced. Further, the integrated laminated sheet is adjusted in thickness between the laminating roll I5 and the laminating roll II6 to obtain a laminated sheet having a desired thickness. The laminated sheet passes between the laminating roll II6 and the laminating roll III7 and is wound up by the laminated sheet winding roll 4. Further, as a technical application example, it is possible to obtain an injection-molded product excellent in decorativeness such as edging and marking by stacking inserts at the time of injection molding, which is a punched product of a decorative sheet. .

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

[0012]

【Example】

 Examples will be described with reference to the drawings. A decorative sheet A mainly made of crystalline polypropylene and a cyclopentadiene-based petroleum resin was stretch-formed to a thickness of 50 μm, and a decorative sheet was punched for a peep window C. It is wound around the anti-roll 3, and the roll 3 is attached to the manufacturing apparatus shown in FIG. Next, a transparent sheet composition mainly composed of crystalline polypropylene is melt-kneaded by an extrusion molding machine 1, and the obtained melt-kneaded product 2 of the transparent sheet composition is used as a laminating roll I5 and a laminating roll. II6 and the decorative sheet A and the transparent sheet B, and the laminated polypropylene sheet having a thickness of 500 μm is manufactured. The laminated sheet was passed between a laminating roll II6 and a laminating roll III7, and the winding roll 4 wound the sheet.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a watermarked laminated polypropylene sheet.

FIG. 2 is a main part perspective view showing the concept of manufacturing a watermarked laminated polypropylene sheet.

FIG. 3 is a perspective view of a main part of a box using a laminated polypropylene sheet with a watermark.

FIG. 4 is a cross-sectional view of an essential part of a box using a watermarked laminated polypropylene sheet.

FIG. 5 is a cross-sectional view of a main part of a conventional box making machine.

[Explanation of symbols]

A decorative sheet B transparent sheet C viewing window D pigment-added sheet E adhesive 1 extrusion molding machine 2 melt-kneaded product of transparent sheet composition 3 decorative sheet original roll 4 watermarked laminated polypropylene sheet take-up roll 5 laminated Roll I 6 Multi-layer roll II 7 Multi-layer roll III 8 Fishing hole

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Claims (4)

[Scope of utility model registration request] 1. Obtained by integrally molding a decorative sheet (A) made of crystalline polypropylene having a view window (C) punched out and a transparent sheet (B) mainly made of crystalline polypropylene. Watermarked laminated polypropylene sheet. 2. A watermarked laminated polypropylene sheet according to claim 1, wherein the decorative sheet (A) is composed of crystalline polypropylene and a cyclopentadiene-based petroleum resin. 3. A watermarked laminated polypropylene sheet according to claim 1, wherein the decorative sheet (A) is composed of crystalline polypropylene, a cyclopetadiene-based petroleum resin and an inorganic additive. 4. A box making obtained by molding the watermarked laminated sheet according to any one of claims 1 to 3.