JP3211207U - Plastic molded product - Google Patents

Abstract

Disclosed is a resin molded product such as a clear file, a binder, or a book cover that is less susceptible to damage such as whitening or cracking. A resin molded article 10 is made of a composite material in which an elastomer is blended with a thermoplastic resin. A long sheet body 12 is bent at a central line 12a in a longitudinal direction and the central line 12a serves as a boundary on one side. The sheet part 12b and the sheet part 12c on the other side are overlapped to form a rectangle. At one end portion 10a in the longitudinal direction of the resin molded product 10 having a rectangular shape, a welded portion 14 is formed in which the folded sheet portions 12b and 12c are welded to each other by thermal welding or ultrasonic welding. The molded product 10 has a so-called file shape in which a storage space is defined between the sheet portions 12b and 12c and a storage object such as a document or a notebook can be stored in the space. [Selection] Figure 1

Description

  The present invention relates to a resin molded product containing a resin, and particularly formed from the resin.

  Conventionally, clear files, binders, book covers and the like have been widely used as this type of resin molded product. These resin molded products are generally produced from thermoplastic resins with good processability, and polypropylene having a particularly high strength and excellent chemical resistance is widely used.

  However, a resin molded product made of a single polypropylene has a problem that damage such as whitening or cracking is likely to occur due to external force such as impact during use.

  Therefore, the present invention has been made in view of such problems, and an object of the present invention is to provide a resin molded product that is less susceptible to damage such as whitening and cracking.

  In order to solve the above problems, one embodiment of the present invention is composed of a composite material in which an elastomer is blended with a thermoplastic resin.

  According to the present invention, it is possible to provide a resin molded product that is less susceptible to damage such as whitening and cracking. The other effects of the present invention will also be described in the section for implementing the following invention.

It is a front view which shows typically the resin molded product which concerns on embodiment. It is a figure which shows the various test results in the resin molded product which concerns on embodiment, and the general resin molded product used as a comparison object.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present embodiment, in the present specification and the drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 1, a resin molded product 10 according to an embodiment of the present invention includes a long sheet body 12 that is bent at a longitudinal center line 12 a and a sheet portion 12 b on one side with the center line 12 a as a boundary. And the sheet portion 12c on the other side are overlapped to form a rectangle. At one end portion 10a in the longitudinal direction of the resin molded product 10 having a rectangular shape, a welded portion 14 is formed in which the folded sheet portions 12b and 12c are welded to each other by thermal welding or ultrasonic welding. The molded product 10 has a so-called file shape in which a storage space is defined between the sheet portions 12b and 12c and a storage object such as a document or a notebook can be stored in the space. In addition, a notch 16 is formed in the sheet portion 12b on one side in the vicinity of the other longitudinal end portion 10b of the resin molded product 10 to facilitate the separation of the sheet portions 12b and 12c, that is, the opening of the accommodation space. ing.

  In the present embodiment, the sheet body 12 is composed of a composite material in which an elastomer is blended (super finely dispersed) in polypropylene. The blending ratio (weight ratio) of this polypropylene and elastomer is preferably in the range of 98: 2 to 70:30. The thickness of the sheet body 12 is preferably 0.1 mm to 3.0 mm, and is preferably formed as a single sheet. By configuring in this way, the sheet main body 12 has transparency and can realize a texture equivalent to that of a resin molded product sheet made of polypropylene alone, and at a lower cost than the sheet, it is flexible (elastic), It becomes possible to improve impact resistance. Moreover, by using an elastomer, the above properties such as flexibility can be imparted to polypropylene without using a plasticizer.

Example 1
Various tests were performed on the above-described resin molded product 10 and a conventional resin molded product (hereinafter referred to as a conventional product) composed of a general polypropylene alone. Here, the resin molded product 10 and the conventional product were formed by molding the sheet main body of the resin molded product 10 to a thickness of 0.7 mm and cutting it into an appropriate test piece. FIG. 2 shows various test items and the results of the test method. The test was performed in a state in which the test pieces were arranged horizontally (MD) and vertically (TD). Note that Autograph AGS-1KNJ manufactured by Shimadzu Corporation was used for the tests of tensile yield strength, tensile yield elongation, and tensile yield modulus. Further, a DuPont impact tester manufactured by Toyo Seiki Seisakusho Co., Ltd. was used for the DuPont impact strength test.

  As shown in FIG. 2, the resin molded product 10 has a higher tensile yield strength and tensile yield modulus for both MD and TD, and higher tensile yield strength and DuPont impact strength for both MD and TD than the conventional product. It became the result.

  From the above test results, it can be seen that the sheet body 12, and thus the resin molded product 10, has lower rigidity than the conventional product, that is, high flexibility, and excellent impact resistance and cold resistance. Accordingly, the resin molded product 10 has extremely useful characteristics such that whitening and cracking are less likely to occur and scratches are less likely to occur compared to conventional products.

  In the present embodiment described above, it has been described that polypropylene is used as the component of the sheet body 12, but the present invention is not limited to this. Any thermoplastic resin that can be blended with an elastomer may be used. Examples thereof include olefin thermoplastic resins such as polyethylene and polypropylene, styrene thermoplastic resins such as polystyrene, polyamide thermoplastic resins such as nylon, and polyethylene. Examples thereof include polyester thermoplastic resins such as terephthalate, acrylic thermoplastic resins such as ABS resin, and vinyl chloride thermoplastic resins such as polyvinyl chloride. Moreover, these may be mixed and used. The elastomer is preferably a thermoplastic elastomer having elasticity at room temperature (having the properties of a rubber elastic body). By using a thermoplastic elastomer, characteristics such as flexibility can be imparted to polypropylene without using a plasticizer.

  Moreover, in this embodiment, although demonstrated that the resin molded product 10 made file shape, it is not limited to this. The resin molded product 10 may be made of the composite material described above or may include a part thereof, such as a binder, a holder, a calendar holder, a clear pocket, a pouch capable of accommodating articles such as paper. , Accessories such as small cases, trays, boxes, notebook and diary covers, notebook covers, cover materials such as book covers, mouse pads, desk mats, stationery such as underlays, and name holders, calendar cases, cards Examples include injection molded products such as cases.

  Note that “consisting of a composite material” in claim 1 in the scope of a utility model registration claim does not mean that the composite material is composed solely of a composite material, but a part of the composite material is used. That is, it is meant to include those composed of the composite material.

  The present invention can be implemented in various other forms without departing from the gist or main features thereof. Therefore, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. The scope of the present invention is indicated by the scope of the utility model registration request, and is not restricted by the text of the specification. Further, all modifications, various improvements, alternatives and modifications belonging to the equivalent scope of the utility model registration claims are all within the scope of the present invention.

1 Resin molded product 12 Sheet body

Claims (5)

  A resin molded product comprising a composite material in which an elastomer is blended with a thermoplastic resin.   The resin molded product according to claim 1, wherein a blending ratio of the thermoplastic resin and the elastomer is 97: 3 to 70:30. The resin molded product is formed from a sheet-like material made of the composite material,
3. The resin molded product according to claim 1, wherein the sheet has a thickness of 0.1 mm to 3 mm.   The said elastomer is a thermoplastic elastomer, The resin molded product as described in any one of Claims 1-3 characterized by the above-mentioned.   The resin molded article according to any one of claims 1 to 4, wherein the thermoplastic resin is polypropylene.

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