JP2008168999A - Plastic core - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plastic core which has excellent bending strength, flattening strength and impact resistance and in which dimension change to the axial center direction is extremely small even when temperature is changed. <P>SOLUTION: The plastic core 1 is formed of a material obtained by mixing 25-35 pts. by mass of talc (water-containing magnesium silicate) with 100 pts. by mass of polypropylene. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a plastic core used as a core for films, sheets and the like.

Conventional cores of this kind of film, sheet, etc. have generally been used as paper tubes, but paper tubes are made by compressing cardboard into a cylindrical shape that can be reused. There is a problem that it is not a thing but disposable and must be disposed of as waste when it is used up. Therefore, reusable plastic cores are being used instead of paper tubes. As a plastic core material currently used, ABS resin is often used as disclosed in Patent Document 1.
JP 2004-256277 A

  A plastic core made of an ABS resin as disclosed in Patent Document 1 is excellent in bending strength and flattening strength, but is weak against impact, and has a large linear expansion coefficient in the axial direction due to a temperature change. There is a problem that dimensional changes are likely to occur.

  An object of the present invention is to solve such problems, and to provide a plastic core that is excellent in bending strength, flattening strength, impact resistance, and that has a very small dimensional change in the axial direction even with a temperature change. is there.

  The plastic core according to claim 1 of the present invention is made of a material obtained by mixing talc (hydrous magnesium silicate) in a range of 25 to 35 parts by mass with respect to 100 parts by mass of polypropylene.

  As described above, the plastic core of the present invention is made of a material obtained by mixing talc (hydrous magnesium silicate) in a range of 25 to 35 parts by mass with respect to 100 parts by mass of polypropylene. It is possible to provide a plastic core that is excellent in strength and impact resistance and that has a very small dimensional change in the axial direction even when the temperature changes.

Hereinafter, an embodiment of the present invention will be specifically described with reference to FIG.
In the figure, 1 is a plastic core of the present embodiment, and this plastic core 1 is made of a material obtained by mixing talc (hydrous magnesium silicate) in a range of 25 to 35 parts by mass with 100 parts by mass of polypropylene. . If the amount of talc is less than 25 parts by mass, there is a problem that the required strength as an alternative to an ABS plastic core cannot be obtained, and if the amount of talc is more than 35 parts by mass, excellent performance in terms of impact resistance is obtained. There is a problem that can not be. A preferable amount of talc is 30 parts by mass.

  Therefore, as described above, the plastic core 1 of the present embodiment made of a material obtained by mixing 30 parts by mass of talc with 100 parts by mass of polypropylene, the plastic core made of polypropylene not containing talc, and the plastic core made of polyethylene Then, ABS plastic cores were prepared with a thickness of 5 mm and an inner diameter of 75 mm, respectively, and a flatness test and a deflection test of these plastic cores were performed at a test speed of 10 mm / min. The result of the flat test is shown in FIG. 2, and the result of the deflection test is shown in FIG. From the graph shown in FIG. 2, the plastic core 1 of the present embodiment is superior to other plastic cores in flat strength, and the plastic core 1 of the present embodiment is also made of ABS in bending strength from the graph shown in FIG. It can be seen that the plastic core has the same strength as other plastic cores and is superior to other plastic cores.

  Furthermore, the plastic core 1 of the present embodiment made of a material in which 30 parts by mass of talc is mixed with 100 parts by mass of polypropylene, a plastic core made of polypropylene not containing talc, a plastic core made of polyethylene, and ABS Table 1 shows the linear expansion coefficient of the plastic core.

表１からもポリプロピレン１００質量部に対してタルクを３０質量部混ぜ合わせた材料からなる本実施の形態のプラスチックコア１は線膨張係数が他のプラスチックコアよりも小さく、温度変化によっても軸芯方向への寸法変化が極めて小さなプラスチックコアが得られる。

Table 1 also shows that the plastic core 1 of the present embodiment, which is made of a material obtained by mixing 30 parts by mass of talc with 100 parts by mass of polypropylene, has a smaller linear expansion coefficient than other plastic cores. A plastic core with a very small dimensional change is obtained.

  In addition, it is generally known that a material made of polypropylene is superior in toughness (hardness to crack) compared to a material made of ABS, and by mixing talc with this polypropylene, A plastic core having excellent bending strength and flattening strength, and having a very small dimensional change in the axial direction even with a temperature change can be provided.

It is a perspective view of the plastic core in one embodiment of the present invention. It is a graph which shows the flat test result of the plastic core from which material differs. It is a graph which shows the bending test result of the plastic core from which material differs.

Explanation of symbols

  1 Plastic core

Claims (1)

A plastic core made of a material obtained by mixing talc (hydrous magnesium silicate) in a range of 25 to 35 parts by mass with respect to 100 parts by mass of polypropylene.

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