JP2001294365A - Plastic film rolled body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plastic film rolled body excellent in handleability capable of reducing complication of handling equipment and allowing easy handling in a process prohibited from use of an end face protecting material. SOLUTION: In a plastic film rolled body formed by winding up a plastic film on a winding core, the both end parts of the winding core are protruded from both end faces of the film wound layer. Suitably, a projection length of the winding core from each end face of the film wound layer ranges from 3 mm to 100 mm in both ends, while the winding core is formed into a hollow structure with an inside diameter of 76 mm or more and a thickness of 5 mm or more.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic film roll having excellent handleability, in which a plastic film is wound around a core.

[0002]

2. Description of the Related Art Plastic films are widely used in industrial applications because of their excellent properties. With the increase in the demand, in order to improve the productivity and the processing capacity, the rolled material is also becoming wider and longer and larger in diameter.

[0003] Conventionally, a plastic film roll provided for such a widening or a long and long diameter has the same length of the core and the width of the film, and the both end faces of the film winding layer and the core are formed. It is normal to be wound so that both ends are aligned, and in the case of such a plastic film roll, with increasing length and diameter of the film, the difficulty in handling such as packing, transportation and processing increases. In particular, it is more necessary than ever to protect the end face of the wound plastic film layer from deformation or damage due to external pressure or rubbing.

[0004] For this reason, improvement studies have been made to protect the handling equipment surface and the end face of the equipment for transportation and the like with a protective material having a cushioning property.

[0005]

However, in these prior arts, the equipment required for handling plastic rolls having various dimensions is renewed and modified in terms of complicated operation and economical efficiency. In secondary processing, which is insufficient, and unwinding, cutting, and the like must be handled without an end face protecting material, a sufficient effect has not yet been obtained.

An object of the present invention has been made in view of the above problems, and as a result of intensive studies, it has been found that a plastic film winding excellent in handleability which can reduce the complexity of handling equipment and can be easily handled even in a process where an end face protection material cannot be used. To provide things.

[0007]

In order to achieve the above-mentioned object, a plastic film roll for winding a plastic film around a core according to the present invention has both ends of the core projecting from both end surfaces of a film winding layer. The plastic film winding of the present invention further has the following preferred embodiment. (a) The projecting length of the core from both end surfaces of the film winding layer is 3 mm or more and 100 mm or less at both ends. (b) The core has a hollow structure with an inner diameter of 75 mm or more and 260 mm or less and a wall thickness of 5 mm or more and 20 mm or less. (c) The plastic film is a polypropylene film. (d) The thickness of the plastic film is 2 μm or more and 25 μm
m or less, and the winding length is 8000 m or more.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, in a plastic film wound product in which a plastic film is wound around a core, it is necessary that both ends of the core protrude from both end surfaces of the film winding layer.

If both ends of the core do not protrude from both end surfaces of the film winding layer, the end surface of the plastic film winding is deformed by external pressure or rubbing during handling in packing, transportation, processing and the like. And easily become scratched.

In the present invention, the projecting length at which both ends of the core project from both end surfaces of the film winding layer is preferably 3 mm or more, more preferably 5 mm or more, and further preferably 10 mm or more.

On the other hand, if the projecting lengths of both ends of the core are too long, it is necessary to use a wider machine than necessary in a plastic film processing machine or the like, or when the film is wound around the center of the core. The projection length is preferably 100 mm or less, more preferably 75 mm or less, further preferably 50 mm or less, and particularly preferably 30 mm or less, because positioning may be difficult. The protruding length of both ends of the core may be the same or different, but the packing materials can be standardized, the balance can be easily balanced when attaching and detaching the plastic film to the processing machine, etc. It is preferable that they are the same from the viewpoint of easy positioning in the direction.

The core used for the plastic film roll of the present invention preferably has a hollow shape structure. The inner diameter of the core of such a hollow structure is 38 mm
(Nominal value 1.5 inches), 76 mm (nominal value 3 inches), 152 mm (nominal value 6 inches) and 254 mm
(A nominal value of 10 inches), and when the core is handled in a direction perpendicular to the ground, a large diameter is preferable from the viewpoint of stability. If the diameter is too large, there is a restriction on the mechanism of various processing machines, so that the diameter is preferably 75 mm or more and 260 mm or less, more preferably 100 mm or more and 200 mm or less.

There is also a suitable value for the thickness of the core. As the length and diameter of the plastic film roll become longer and longer, the pressure due to the weight and tightening of the roll tends to increase. From this viewpoint, it is preferable that the thickness of the core is thicker, whereas if it is too thick, the weight of the core increases. 5 mm or more, preferably 20 mm or less, more preferably 6 mm or more, 15 mm or less, because it is disadvantageous in terms of handleability and economy in that point,
More preferably, it is 8 mm or more and 15 mm or less.

A notch called a notch may be provided in the winding core depending on the structure of a portion of a facility such as a processing machine where a plastic film roll is attached.
In the plastic film roll of the present invention, the notch does not hinder. That is, the plastic film is not wound on the cutout portion due to the protruding portion , and the film is not deformed.

Examples of the material of the core used for the plastic film roll of the present invention include paper, plastic, a simple substance of metal, a mixture or a laminate thereof, and the like. It is not limited.

The shape of the core used for the plastic film roll of the present invention is preferably a hollow structure, and the hollow structure is, for example, a cylindrical or polygonal cylindrical shape. Although it does not matter, it is preferable that the film has a cylindrical shape from the viewpoint that the film is not deformed.

Further, at the beginning of the winding of the plastic film wound material of the present invention, the material to be attached to the core when the film is attached is not particularly limited. For example, an adhesive tape or an adhesive may be used. Also, it may be water, or may be wound without using a sticking material.

The plastic film of the plastic film roll of the present invention has poor rigidity, for example, 2 μm.
As described above, it is more suitable for a thin film having a thickness of 25 μm or less, and a plastic film having a thickness in this range is more preferably one having a winding length of 8000 m or more so that the winding diameter becomes large. The plastic film roll of the present invention is particularly suitable for a long and large-diameter film having a width of 200 mm or more and an outside diameter including a film winding layer of 200 mm or more.

The type of the plastic film of the plastic film roll of the present invention is not particularly limited, and examples thereof include a polypropylene film, a polyethylene terephthalate film, a polycarbonate film, a polyethylene naphthalate film, a polystyrene film, and a polyimide film. However, the present invention is more suitable for a film having low rigidity such as a polypropylene film.

Next, an example of a method for producing a plastic film roll of the present invention will be described.

First, the plastic resin is melted, and the molten plastic resin is extruded into a sheet from a slit T-die and stretched in the length direction and the width direction.
Wind the heat-treated film with a winder.

The width 1000 mm thus obtained,
While cutting both ends of the film having a length of 17000 mm with a slitter, it is about 6 to 200 mm longer than the film width.
It is wound around a central portion of a paper core having an inner diameter of 152 mm and a thickness of 10 mm.

The use of the plastic film roll of the present invention includes magnetic materials such as video tapes and audio tapes, packaging materials for food and clothing, capacitors and electrical insulation. Examples include electrical applications, decorative applications such as book covers and albums, and miscellaneous goods applications such as adhesive tape.
So-called general industrial uses, including other optical films and mold release.

[0024]

Next, the present invention will be described based on embodiments. The measurement method and evaluation method used in the present invention are as follows.

(1) Projection length The distance from each end surface of the film winding layer to the end of the core is measured at three points obtained by equally dividing the circumferential direction of the core with a metal straight scale specified in JIS B 7516. The average was determined.

(2) Handling property The plastic film roll cut by the slitter is
Further, after detaching at the unwinding portion of the narrow slitter, the state of the end surface of the wound film layer was observed.

Example 1 A polypropylene resin was supplied to an extruder and melted. The molten polypropylene resin was extruded from a slitted T-die into a sheet, cooled and solidified by a cooling roll, and then lengthwise and widthwise. It was stretched in the direction and wound up by a winder. The film thickness was 8 μm.

Next, both ends of the film wound in this manner were slit, and the width was 620 mm and the length was 1600.
Five pieces were wound around the center of a cylindrical paper core having an inner diameter of 152 mm, a wall thickness of 10 mm, and a length of 650 mm so as to be 0 m.
The distance from the end face of the film winding layer to the end of the core is 15 on both sides.
mm.

The rolled polypropylene film thus obtained was further attached to the unwinding portion of a small width slitter using a movable crane above the floor, and then removed, and the end face of the rolled film layer was observed.

No scratches or pressure marks were found on both end faces of the five wound film layers. In addition, one of these five pieces was attached to the small width slitter again, and was rewound at a speed of 300 m / min with an unwinding tension of 6 kg, but no trouble occurred.

Example 2 A polypropylene resin was supplied to an extruder and melted. The molten polypropylene resin was extruded from a slitted T-die into a sheet, cooled and solidified by a cooling roll, and then lengthwise and widthwise. It was stretched in the direction and wound up by a winder. The film thickness was 8 μm.

Next, both ends of the film wound in this manner were slit, and the width was 620 mm and the length was 1600.
Five pieces were wound around the center of a cylindrical paper core having an inner diameter of 152 mm, a thickness of 10 mm, and a length of 624 mm so as to be 0 m.
The distance from the end surface of the film winding layer to the end of the core is 2 m on both sides.
m.

The rolled polypropylene film thus obtained was further attached to the unwinding portion of a narrow slitter with a floor-mounted crane, and then removed, and the end face of the rolled film was observed.

Pressing marks were formed on one side of the end faces of two of the film winding layers out of the five. One of the pressing marks was reattached to the narrow slitter and unrolled with a feeding tension of 6 kg.
The film was rewound at a speed of 00 m / min, but no trouble occurred.

Example 3 A polypropylene resin was supplied to an extruder and melted, and the melted polypropylene resin was extruded from a slit T-die into a sheet, cooled and solidified by a cooling roll, and then lengthwise and widthwise. It was stretched in the direction and wound up by a winder. The film thickness was 8 μm.

Next, both ends of the film wound in this manner were slit, and the width was 620 mm and the length was 1600.
Five rolls were wound around the center of a cylindrical paper core having an inner diameter of 152 mm, a wall thickness of 6 mm, and a length of 650 mm so as to be 0 m. The distance from the end surface of the film winding layer to the end of the core is 15 m on both sides
m.

The thus obtained rolled polypropylene film was further mounted on the unwinding portion of the narrow slitter with a floor crane, and then removed, and the end face of the rolled film layer was observed.

No scratches or pressure marks were found on both end faces of the five film winding layers. One of these five pieces was reattached to the narrow slitter and unrolled with a tension of 6 kg to 300 pieces.
The film was rewound at a speed of m / min, but no trouble occurred.

(Comparative Example 1) A polypropylene resin was fed to an extruder and melted, and the melted polypropylene resin was extruded into a sheet from a slit T-die, cooled and solidified by a cooling roll, and then lengthwise and widthwise. It was stretched in the direction and wound up by a winder. The film thickness was 8 μm.

Next, both ends of the film wound in this manner were slit, and the width was 620 mm and the length was 1600.
Five rolls were wound on a cylindrical paper core having an inner diameter of 152 mm, a thickness of 10 mm, and a length of 620 mm so that the end faces of the film winding layer were aligned with both ends of the core so as to be 0 m. The distance from the end surface of the film winding layer to the end of the core is 0 m on both sides.
m.

The rolled polypropylene resin film thus obtained was further attached to the unwinding portion of a small width slitter with a floor-mounted crane, and then removed, and the end surface of the rolled film layer was observed.

All five of the five had scratches on the end faces of the film winding layers on both sides. One of the five scratched pieces was attached to the small width slitter again and rewound at a speed of 300 m / min with an unwinding tension of 6 kg.
At 700m, the film broke.

Example 4 A polypropylene resin was supplied to an extruder and melted. The molten polypropylene resin was extruded from a slit T-die into a sheet, cooled and solidified by a cooling roll, and then lengthwise and widthwise. It was stretched in the direction and wound up by a winder. Film thickness is 18μm
Met.

Next, both ends of the film wound in this manner were slit, and the width was 650 mm and the length was 1500.
m, inner diameter 76 mm, wall thickness 8 mm, length 80
Five pieces were wound around the center of a 0 mm cylindrical plastic core. The distance from the end surface of the film winding layer to the end of the core was 78 mm on one side and 72 mm on the other side.

The rolled polypropylene resin film thus obtained was further manually attached to the unwinding portion of a narrow slitter, which was removed and the end face of the rolled film was observed.

There were no scratches or pressure marks on both end faces of the five film winding layers. Further, one of these five pieces was attached to the small width slitter again, and was rewound at a speed of 250 m / min with an unwinding tension of 7 kg, but no trouble occurred.

(Comparative Example 2) A polypropylene resin was supplied to an extruder and melted. The molten polypropylene resin was extruded from a slitted T-die into a sheet, cooled and solidified by a cooling roll, and then lengthwise and widthwise. It was stretched in the direction and wound up by a winder. Film thickness is 18μm
Met.

Next, both ends of the film wound in this manner were slit, and the width was 650 mm and the length was 1500.
m, inner diameter 76 mm, wall thickness 8 mm, length 80
Five rolls were wound on a 0 mm cylindrical plastic core such that one end was aligned with the end surface of the film winding layer. The distance from the end surface of the film winding layer to the end of the core is 150 m on one side.
m, and the other side was 0 mm.

The rolled polypropylene resin film thus obtained was further manually attached to the unwinding portion of a narrow slitter, which was removed and the end face of the rolled film was observed.

Four of the five had scratches on the side where the film winding layer and the core end were aligned. One of the scratched pieces was attached to a small width slitter again and rewound at a speed of 250 m / min with an unwinding tension of 7 kg.
At 20m, the film was broken. In addition, it took time to position the film in the width direction in order to set the film at the center of the small width slitter.

[0051]

According to the present invention, it is possible to reduce the complexity of handling equipment and to obtain a plastic film roll excellent in handleability, which can be easily handled even in a process where the end face protecting material cannot be used. .

As a result, it is possible to prevent the edge of the film from being damaged.
Especially 25μm where slight scratches easily reach the film break
The effect is remarkable in the following thin films.

Claims (5)

[Claims] 1. A plastic film wound product comprising a plastic film wound around a core, wherein both ends of the core project from both end surfaces of the film winding layer. 2. The plastic film roll according to claim 1, wherein the length of protrusion of the core from both end surfaces of the film winding layer is 3 mm or more and 100 mm or less at both ends. 3. The core has an inner diameter of 75 mm or more and 260 mm.
The plastic film roll according to claim 1 or 2, having a hollow structure having a thickness of 5 mm or more and 20 mm or less. 4. The plastic film roll according to claim 1, wherein the plastic film is a polypropylene film. 5. The plastic film roll according to claim 4, wherein the thickness of the plastic film is 2 μm or more and 25 μm or less, and the winding length is 8000 m or more.