JP3579008B2 - Stretch film roll - Google Patents

Description

【００１７】
また、この発明は、ストレッチフィルム１に張力を掛けないで、巻き取るようにしているので、図２に示すように、巻芯２として、紙管を使用することなく、使用後に平板状に展開可能な紙等からなる平板を円筒形に湾曲させたものを使用することができる。
【００１８】
巻芯２として紙等の平板を使用すると、平板状に広げて廃棄ができ、また、リサイクルが可能となる。
【００１９】
【発明の効果】
この発明に係るストレッチフィルムのロール体は、以上のように、巻芯として厚みの薄いものを使用しても、圧縮破壊が生じず、また高温雰囲気下に放置しても、巻ずれを生じないので、製品コストの低減が図れる。
【図面の簡単な説明】
【図１】ストレッチフィルムのロール体に切り込みを入れた状態を示す斜視図
【図２】この発明に係るストレッチフィルムのロール体の一例を示す断面図
【符号の説明】
１ ストレッチフィルム
２ 巻芯
ａ 切れ込み幅[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a roll of a stretch film in which a stretch film for packing is wound around a core.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a stretch film used to prevent a product from collapsing in a load has been used in the form of a roll wound around a core.
[0003]
[Problems to be solved by the invention]
Incidentally, a stretch film made of polyolefin resin having a thickness of about 18 μm and a width of about 500 mm is often used.
[0004]
The winding length is usually hundreds of meters, and is wound around the winding core while giving a tension of about 5 to 8 kg / m to the winding section, and is stretched around the winding core. Has a large residual stress.
[0005]
Therefore, conventionally, a core having a high strength is used as a winding core so as to withstand this large residual stress, and in a business where a large amount of a roll body of a stretch film is used, a large amount of used paper core accumulates. .
[0006]
However, since the paper tube has a high strength as described above, when it is disposed of, it cannot be crushed as long as it is stomped on.
[0007]
Further, although the paper core is discarded after use, a high-strength paper core is expensive. There is also a problem that this expensive paper tube increases the product cost of the roll body.
[0008]
In addition, if there is a large residual stress in the stretch film of the roll body, the core itself is compressed and broken during storage, or when left for a long time in a high-temperature atmosphere, a winding shift occurs and the commercial value is reduced. There was a problem.
[0009]
Accordingly, an object of the present invention is to provide a roll body of a stretch film which does not require the use of a high-strength winding core and does not cause a winding deviation even when left in a high-temperature atmosphere for a long time.
[0010]
[Means for Solving the Problems]
According to the present invention, the tension when winding a polyolefin resin stretch film having a thickness of 18 μm, a width of 500 mm, and a length of 300 m on a core having an inner diameter of 3 inches and a wall thickness of 4.5 mm or less is taken up. When the residual stress of the stretch film is inspected by the width of the notch width generated when a notch with a depth of 10 mm or more is made over the entire width in the axial direction on the surface of the stretch film so that the width is within 5 mm. It was regulated.
[0011]
That is, when the stretch film is wound on the core, if the tension applied to the stretch film is increased, the stretch film after winding has a large residual stress. Displacement is also likely to occur. Therefore, in the present invention, paying attention to the fact that the stretch film has self-adhesiveness and can be wound on the core without applying tension, when the stretch film is wound up, the tension is minimized. Specifically, a notch with a depth of 10 mm or more is placed over the entire width in the axial direction on the surface of the wound stretch film so as not to be caught, and when the notch width is measured, the notch width is within 5 mm. In this way, the winding tension is regulated to prevent the shrinkage and winding deviation of the stretch film, and the necessity of using a strong core as the winding core is eliminated.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described.
When winding a stretch film made of polyolefin resin having a thickness of 18 μm and a width of 500 mm by 300 m by a winder, the tension of the winding section is set to three different conditions of 8 kg / m, 5 kg / m, and 0.5 kg / m. Then, various rolls of a stretch film wound on a paper tube having an inner diameter of 3 inches having different wall thicknesses are prepared, and after leaving at 40 ° C. for 4 hours, the paper tube is broken or the winding is displaced. Was tested.
[0013]
The results are as shown in Table 1. The winding portion has a tension of 0.5 Kg / m and almost no tension is applied when the winding is performed. When a notch having a length of 10 mm was cut across the entire width in the axial direction and the notch width was measured, the notch width was 2 mm, which satisfied the condition of the present invention that the notch width was 5 mm or less. No compression breakage occurred, and no winding deviation occurred.
[0014]
On the other hand, when the tension of the winding portion is 5 kg / m or 8 kg / m, the residual stress of the stretch film is inspected by making a cut of 10 mm deep on the surface of the stretch film over the entire width in the axial direction. When the cut width was 8 mm and 12 mm, respectively, and the thickness of the paper tube was 5 mm or less, compression breakage occurred in the paper tube and left at 40 ° C. for 4 hours. Then, a winding deviation occurred.
[0015]
In addition, as shown in FIG. 1, the cut width a of the outer peripheral portion of the stretch film 1 was measured after cutting the stretch film 1 with a cutter as shown in FIG.
[0016]
[Table 1]

[0017]
Further, in the present invention, since the stretch film 1 is wound without applying tension, as shown in FIG. 2, the stretch core 1 is developed into a flat shape after use without using a paper tube. It is possible to use a flat plate made of a possible paper or the like curved into a cylindrical shape.
[0018]
When a flat plate made of paper or the like is used as the core 2, it can be spread and discarded in a flat plate shape, and can be recycled.
[0019]
【The invention's effect】
As described above, the roll body of the stretch film according to the present invention does not cause compression failure even if a thin core is used as the winding core, and does not cause winding deviation even when left in a high-temperature atmosphere. Therefore, the product cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a state in which a cut is made in a roll body of a stretch film. FIG. 2 is a cross-sectional view showing an example of a roll body of a stretch film according to the present invention.
1 Stretch film 2 Core a Cut width

Claims (2)

The above-mentioned winding was performed on a roll of a stretching film in which a polyolefin resin stretch film having a thickness of 18 μm, a width of 500 mm, and a length of 300 m was wound on a winding core having an inner diameter of 3 inches and a wall thickness of 4.5 mm or less . When the residual stress of the stretch film is inspected by the width of the cut width generated by making a notch having a depth of 10 mm or more over the entire width in the axial direction on the surface of the stretch film, the width is set to be 5 mm or less. A roll of stretch film that regulates the tension during removal. The roll body of a stretch film according to claim 1, wherein a flat plate made of paper or the like that can be developed into a flat plate shape after use is curved into a cylindrical shape.

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