JPH03187859A - Sheet-like mold - Google Patents

Abstract

PURPOSE:To reduce a manufacturing cost of an outer packaging case and eliminate deterioration in a commercial value of a product using the case as a package by forming design indications based on rough-surface-finishing at specific positions of the surface of a sheet-like mold which has been subjected to smooth finishing. CONSTITUTION:Synthetic resin or molten substance is rolled by a pair of emboss rolls and then cooled and set to have an outer surface 11b smooth-finished while an inner surface 11a is subjected to rough-surface-finishing with crimp patterns for ensuring smooth insertion/removal of a cassette tape so that a sheet-like mold 11 in a specific shape is molded. At the same time a specific number of rough-surface- finished design indications 12 are formed at constant positions on the outer surface 11b of the sheet-like mold 11. Then the sheet is stamped into a specific number of small pieces 13 during a stamping process, and a crease 14 is pressed on each of the small pieces 13, and joint pieces 15 are folded inward with the crease 14 as a border to be overlaid and jointed with each other to have a protection case 16 assembled. At this time such an appearance is exhibited that a design indication 12 is located at a constant position of the protection case 16 as if the design indication 12 has been printed at the constant position of a transparent sheet so as to exhibit a design effect equal to printing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sheet-like molded product used as a packaging material, for example, a protective case for a VTR cassette tape, a book case, or a designed case for cosmetics.

[Conventional technology]

In recent years, with the diversification of products, the exterior cases of products are printed with various designs in addition to the brand name, quality, and other characters necessary for identification. Cases have come to take on forms that can meet users' tastes or demands for luxury goods. The above-mentioned exterior cases include those made of paper and those made of synthetic resin. For example, protective cases for VTR cassette tapes, decorative cases for cosmetics, etc. are made of the latter to make them more luxurious products. They are common, and more recently, synthetic resins have been increasingly used for book cases. In view of manufacturing costs, these synthetic resin exterior cases are generally assembled by punching out sheet-shaped molded synthetic resin products.

Conventional sheet-shaped molded products of this type are often made of, for example, polypropylene because of their good processability, and the above-mentioned exterior case is processed, for example, in accordance with the processing sequence shown in FIG.

In Fig. 2, reference numeral 1 is a plain sheet-like molded product that has been sheeted with an embossing roll or the like, and the sheet-like molded product 1 is cut into a predetermined length at the time of sheeting and formed into a large rectangular shape. has been done. Next, the sheet-like molded product 1 is printed with a design display part 2 consisting of a predetermined number of brand name, product name identification characters, etc. at a predetermined position by offset printing, for example, and is further punched into a predetermined number of small pieces 3 having the same shape. .

Next, each of the small pieces 3 is subjected to a creasing process to form a fold line 4 by stamping, that is, by heat processing or the like.

Then, it is bent along the fold line 4, and the joint pieces 5 formed with the fold line 4 as a boundary are superimposed on each other, and the necessary parts are welded by ultrasonic processing or the like to assemble the case 6.

Note that the design display portions 2 are printed on each of the sheet-like molded products 1 so as to be positioned at predetermined positions on the assembled case 6.

[Problem that the invention seeks to solve]

However, in such conventional sheet-shaped molded products, the design display part is printed in a separate process when processing the exterior case, which increases the manufacturing cost of the case. There was a problem. In other words, among the series of processing steps mentioned above, the printing process accounts for the largest cost, and since it must be carried out at a specialized printing factory, transportation costs are also added, which is a major factor in increasing the manufacturing cost of exterior cases. Ta.

Furthermore, in the case of protective cases for VTR cassette tapes, for example, price competition is fierce in the cassette tape market, and cassette tape manufacturers need to reduce not only the cost of the cassette tape itself, but also the cost of the protective case as much as possible. has become a major issue. Furthermore, since synthetic resin cases are generally more expensive than paper cases, tape manufacturers are eager to reduce the cost of the protective cases mentioned above.

Furthermore, if the sheet-shaped molded product is made of a synthetic resin such as polypropylene that has poor adhesion to printing ink, the design display area is printed particularly by silk screen printing or offset printing; Even with this printing technology, the adhesion of the ink is still insufficient, and the printed portion often peels off and falls off during the distribution stage or during use. As a result, there has been a problem in that the quality of products using the exterior case as a packaging material has deteriorated, making them the subject of user complaints.

The present invention was made against the background of the above-mentioned conventional technical problems, and it is possible to omit the printing process of the design display part, prevent the printed part from peeling off or falling off, and reduce the manufacturing cost of the exterior case. A further object of the present invention is to provide a sheet-like molded product that eliminates the reduction in commercial value of products using the case as a packaging material.

[Means for solving problems]

The present invention provides a sheet-like molded product in which at least one of the inner and outer surfaces is smooth-finished, and a design display portion based on a rough surface finish is provided at a fixed position on the surface of the smooth-finished sheet-like molded product. The present invention provides a sheet-like molded product in which

C Effect] In the present invention, a design display portion based on a rough surface finish is formed at a fixed position of a sheet-like molded product whose surface has been smoothed in the sheeting process. Next, the sheet-like molded product is punched out and ruled with folded lines, then bent, and the joint pieces are joined to assemble an exterior case in which the above-mentioned design display parts are formed at fixed positions.

In the present invention, since the exterior case with the design display area formed thereon is assembled without a printing process, the manufacturing cost of the case can be significantly reduced while achieving the same design effect as printing. It is possible to obtain a sheet-like molded product that prevents a decrease in the commercial value of a product using the case as a packaging material due to peeling or falling off of parts.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings, but the present invention is not limited only to the embodiments shown below.

In this embodiment, a sheet-like molded product in a protective case for a VTR case/nod tape will be taken as an example.

FIG. 1 is a diagram showing an embodiment of the present invention.

First, this configuration will be explained.

In FIG. 1, reference numeral 11 indicates a transparent sheet-like molded product, and the sheet-like molded product 11 has both inner and outer surfaces 11a and 11b.
In this embodiment, the outer surface 11b of at least one of them is finished smooth, and the inner surface 11a has a rough surface finish with a textured pattern so that a cassette tape (not shown) can be smoothly taken in and out of the case. There is.

Note that the grain pattern applied to the inner surface 11a does not necessarily have to be applied to the inner surface, but is arbitrary, and for example, a pattern in which both surfaces are completely smooth may also be adopted.

Further, these finishes are carried out by a sheeting technique in which a continuously supplied melt of synthetic resin, such as polypropylene, is rolled by a pair of embossing rolls (not shown) and cooled and solidified.

With these embossing rolls, a predetermined number of design display portions 12 are formed at predetermined positions on the outer surface 11b of the regular sheet-like molded product 11 that is continuously molded. That is, on the surface of one of the embossing rolls that rolls in contact with the outer surface 11b, a predetermined number of concavo-convex portions forming an embossed pattern are provided at predetermined positions. The design display portion 12 can be formed with a rough surface finish. A design display portion 12 based on the presence or absence of a grain pattern, that is, a difference in surface finish processing, is formed at the same time as the sheet-like molded product 11 is sheeted.

Reference numeral 13 indicates a small piece obtained by punching the sheet-like molded product 11 into a predetermined number of pieces, six pieces in this example, using a punching device (not shown), and each of the small pieces 13 is subjected to ruled line processing by a line stamping machine (not shown) to form a fold line 14. be done.

Note that, instead of using such a sushi pressing machine, the above-mentioned embossing roll is provided with a convex shape for forming ruled lines, and the design display area 1 is
It is also possible to form the polygonal line 14 simultaneously with the formation of the polygonal line 2. In this case, similarly to the design display section 12, the position of the convex shape for forming ruled lines needs to be sufficiently calculated and designed in consideration of shrinkage of the synthetic resin (for example, polypropylene) after cooling.

Then, the small pieces 13 are bent along the fold lines 14, and the bonded pieces 15 are overlapped with each other to form a protective case 16 for a VTR cassette tape, which is bonded by, for example, ultrasonic processing. A design display section 12 is located at a predetermined position on the protective case 16.

Note that the fact that the design display portion 12 is formed to be located at a predetermined position on the protective case 16 is the same as in the case of conventional printing.

Further, the design display section 12 displays, for example, only the brand name, and the quality display is displayed on the cassette tape housed in the protective case 16.

Next, the effect will be explained.

In FIG. 1, a synthetic resin, for example, a melt of polypropylene, is rolled by a pair of embossing rolls (not shown), cooled and solidified to give a smooth outer surface 11b, and an inner surface 11a (not shown) as shown above. A regular-shaped sheet-like molded product 11 is formed, which has a rough surface finish with a grain pattern to allow smooth insertion and removal of the cassette tape. At the same time, a predetermined number of roughened design display portions 12 are formed at predetermined positions on the outer surface 11b of the sheet-like molded product 11.

Next, in a punching process, a predetermined number of small pieces 13, six pieces in this example, are punched out, and each of the small pieces 13 has a fold line 1.
4 is pushed.

Further, the bonding pieces 15 are bent inward along the fold line 14, and the bonding pieces 15 are overlapped and bonded by, for example, ultrasonic processing to assemble the protective case 16.

At this time, the design display section 12 is located at a fixed position on the protective case 16, giving an appearance as if the design display section 12 was printed at a fixed position on a transparent sheet, and exhibiting a design effect equivalent to printing. be able to. In addition, since the design display section 12 is not printed, peeling and falling off during the distribution process or during use are of course eliminated.
The design display section 12 will not fall off unless the protective case 16 is exposed to severe conditions such as melting.

Note that the outer surface of the protective case 16 corresponds to the outer surface 11b of the sheet-like molded product 11.

As described above, in this embodiment, since the design display portion 12 based on the difference in surface finish is formed at a fixed position of the sheet-like molded product 11 in the sheeting process, the protective case 16
It is possible to omit the printing process and eliminate peeling and falling off of the printed part. As a result, the manufacturing cost of the protective case 16 can be significantly reduced while achieving a design effect equivalent to that of printing.
It is possible to eliminate the decline in the commercial value of cassette tapes. In addition, by reducing the manufacturing process by one step,
It is possible to shorten product delivery times and further reduce distribution costs.

In this example, the design display portion 12 based on the difference in surface finishing is formed only on the outer surface 11b, but the design display portion may be similarly formed only on the inner surface 11a or on both surfaces. .

Furthermore, the sheet-like molded product 11 is not limited to a transparent one, but may be an opaque one containing pigments, fillers, and the like.

Furthermore, the sheet-like molded product is not limited to a single layer, but may be a multilayer product in which multiple layers are laminated.

〔Effect of the invention〕

According to the present invention, the design display portion based on the rough surface finish is formed at a fixed position on the sheet-like molded product in the sheeting process, so the printing process for the exterior case is omitted, and
It is possible to eliminate peeling and falling off of the printed part. Therefore, while exhibiting the same design effect as printing, it is possible to significantly reduce the manufacturing cost of the exterior case, and furthermore, it is possible to eliminate the decrease in the commercial value of products using the case as a packaging material.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of the process of manufacturing an exterior case from a sheet-like molded product according to the present invention, and FIG. 2 is a diagram showing a conventional process of manufacturing an exterior case from a sheet-like molded product. It is a diagram. 11; Sheet-like molded product 11a; Inner surface 11b; Outer surface 12; Design display area

Claims (1)

[Claims] (1) A sheet-like molded product with a smooth finish on at least one of its inner and outer surfaces, wherein a design display portion based on the rough surface finish is provided at a fixed position on the surface of the smooth-finished sheet-like molded product. Formed sheet-like molded product.