JP6856247B2 - Wrapping body of stretch film for packaging and its winding manufacturing method - Google Patents

Description

The present invention relates to a roll of a stretch film for packaging and a method for manufacturing the roll thereof. In particular, the present invention relates to a winding body of an ultra-thin long stretch film, which can be easily peeled off from the winding body and pulled out at the time of use, and a winding manufacturing method thereof.

Stretch films for wrapping, which are wrapped around an article to pack and wrap the article, have been known for the purpose of preventing the load from collapsing during transportation of the article, preventing the shape from collapsing, protecting the article, and waterproofing. (Patent Document 1).

The stretch film for packaging is a long film formed by forming a synthetic resin into a film having a thickness (thickness) of about 6 to 30 μm. It is extremely thin with a wall thickness of about 6 to 30 μm, has a long length in the longitudinal direction of about 300 m to 500 m, and has a size in the lateral direction that is orthogonal to the longitudinal direction, that is, a width of about 300 mm to 500 mm. Is common.

Blow molding (inflation film forming method), T-die molding (cast film molding), and the like are used as the manufacturing method. In addition, there is also a manufacturing method in which a film formed by these methods is stretched by a secondary process to obtain a pre-stretched film which is a thinned and toughened film.

As shown in FIGS. 1 and 2, such a long film is wound around a tubular core 2 and provided on the market as a roll 1 of a stretch film for packaging. As the tubular winding core, a hollow tubular paper tube, a plastic tube, or the like is adopted, and the size of the outer diameter thereof is generally about 50 to 75 mm. The thickness of the winding layer 3 of the winding body 1 of the packaging stretch film wound around the tubular winding core 2 is usually at least about 10 mm.

As shown in FIG. 2, when the packaging stretch film 4 is peeled off from the packaging stretch film winding body 1 and pulled out for use, the tip side 5 in the longitudinal direction is fixedly grasped and stretched by applying tension. While pulling out (stretching) and wrapping it around the article. The surface of the stretch film for packaging is sticky, and the article is fixed by wrapping it while applying tension. Due to the adhesiveness of the stretch film for packaging (which does not adhere to the article) that is laminated on the outer circumference of the article by wrapping it around the article while stretching (stretching) with tension, it does not come apart and is stretched. With the residual tension, functions such as prevention of load collapse can be exhibited.

The applicant of the present application has also proposed a winding body of a stretch film for packaging without a winding core and a method for manufacturing the same (Patent Documents 2 and 3). The purpose is to eliminate shrinkage deformation during storage and deformation during transportation and handling, and to reduce transportation costs to the same level as a stretch film roll for packaging that is wound around a tubular core without being bulky. It was the one that was done.

The wrapping stretch film roll is used for manual winding work in which an operator holds the film by hand and winds it around an article, or a machine that winds it around an article while stretching it with a machine such as a stretch wrapping machine. Used for winding work.

The winding body of the stretch film for packaging used for the manual winding work is generally a long film having a wall thickness of 6 to 25 μm and a width of about 300 mm to 500 mm.

The body of the stretch film for packaging used for mechanical winding work is a long film with a wall thickness of 12 to 20 μm and a width of about 500 mm in the case of a conventional type that is not stretched greatly while being wound, and a pre-stretch type that is stretched greatly before winding. In the case of, it is generally a long film having a wall thickness of 20 to 30 μm and a width of about 500 mm.

Jikkai Sho 63-123563 Japanese Unexamined Patent Publication No. 2004-131169 Japanese Unexamined Patent Publication No. 2004-137073 Japanese Unexamined Patent Publication No. 3-226414

"Thinking about hand-tied materials and soft ropes tied by hand" (Kenichi Suzuki) "Packaging Technology JPI Journal April 2016 Japan Packaging Technology Association, pp. 50-55"

Stretch films for packaging have been developed over the last 20 to 25 years due to technological development of linear low-density polyethylene resin (LLDPE) used as the main raw material, etc., and because they are easy to stretch and have excellent moldability. It was generalized at once.

Furthermore, with the development of metallocene catalysts, LLDPE resins have come to be used in this technical field as resins with further characteristics, also called m-LLDPE, so that stretch films for packaging are widely used in the market. It has become.

Such a stretch film for packaging has excellent stretchability, excellent toughness (strength), and resistance to tearing (excellent tear strength, puncture strength), so that the thickness of the stretch film can be reduced. I'm on the way.

In particular, due to the rapid increase in the amount used, the wall thickness has been further reduced in recent years from the viewpoint of treatment as industrial waste, environmental measures, and manufacturing cost.

On the other hand, as the film becomes thinner, the stretch film has adhesiveness and is difficult to peel off, and it becomes difficult to peel it off and pull it out.

Not only is it difficult to peel off due to the thinning of the film, but it also breaks when it is pulled out and used due to scratches or damage on the side edges of the roll-shaped stretch film for packaging wound around the tubular core 2. It will be easier to do.

Further, in the case of a roll-shaped stretch film for packaging wound around a tubular core, the width is as large as 300 mm to 500 mm as compared with the diameter of the central core (about 50 to 75 mm). As the film becomes thinner, it takes time to pull it out completely.

Therefore, the present invention proposes a winding body of an ultra-thin long stretch film, which can be easily peeled off from the winding body and pulled out at the time of use, and a winding manufacturing method thereof. I am aiming.

[1]
It is a roll of a stretch film for packaging in which an ultra-thin long stretch film is rolled into a roll, and is continuous in the longitudinal direction of the long stretch film between the stretch films that are laminated to form a roll layer. A plurality of air layers forming in the lateral direction of the long stretch film, or a plurality of air layers intermittently formed in the longitudinal direction in the lateral direction of the long stretch film are present for packaging stretch. Film roll.

[2]
The air layer includes a plurality of portions of the long stretch film having different wall thicknesses continuously in the longitudinal direction or intermittently in the longitudinal direction in the lateral direction of the long stretch film. The winding body of the stretch film for packaging of [1] formed by the above.

[3]
This is a manufacturing method for winding a roll of stretch film for packaging, which winds an ultra-thin long stretch film into a roll.
A plurality of portions having different wall thicknesses continuous in the longitudinal direction of the long stretch film with respect to the long stretch film before being wound into a roll shape are formed in the lateral direction of the long stretch film, or A plurality of portions having different wall thickness formed intermittently in the longitudinal direction are formed in the lateral direction of the long stretch film, stretched 1.2 to 6 times in cross-sectional area ratio, and wound into a roll. As a result, between the stretch films that are laminated to form a winding layer, a plurality of air layers that are continuous in the longitudinal direction of the long stretch film are formed in the lateral direction of the long film, or in the longitudinal direction. A method for winding a winding body of a stretch film for packaging in which a plurality of intermittently formed air layers are present in the lateral direction of the long stretch film.

[4]
A plurality of uneven portions continuous in the longitudinal direction of the long stretch film are formed in the lateral direction of the long stretch film with respect to the long stretch film before the winding is performed, and these are formed by the cross-sectional area ratio. 1. The method for winding a roll of a stretch film for packaging according to [3], which is stretched 2 to 6 times.

[5]
By embossing the long stretch film before the winding is performed, a plurality of portions having different wall thicknesses are intermittently formed in the longitudinal direction, and a plurality of the long stretch films are formed in the lateral direction. [3] The method for winding a roll of a stretch film for packaging.

[6]
By pressing a stamp having a predetermined shape against the long stretch film before the winding is performed, portions having different wall thicknesses are intermittently interrupted in the longitudinal direction of the long stretch film, and the lateral hand of the long film is used. The method for winding a roll of a stretch film for packaging according to [3], in which a plurality of films are formed in a direction and the film is stretched 1.2 to 6 times in cross-sectional area ratio.

[7]
While partially stretching the long stretch film before the winding is performed, the portions having different wall thicknesses continuous in the longitudinal direction of the long stretch film are formed on the side of the long stretch film. The method for winding a roll of a stretch film for packaging according to [3], in which a plurality of films are formed in the direction and stretched 1.2 to 6 times in cross-sectional area ratio.

[8]
While partially stretching the long stretch film before the winding is performed, the portions having different wall thicknesses continuous in the longitudinal direction of the long stretch film are formed on the side of the long stretch film. The process of molding multiple in the direction is
A pair of cylindrical stretching rollers that are provided with outer peripheral ridges and outer peripheral groove portions alternately in a direction in which the central axis extends and that rotate about the central axis are the one of the cylindrical stretching rollers. With respect to a stretching roller in which the outer peripheral ridge portion is arranged so as to mesh with the outer peripheral groove portion of the other cylindrical stretching roller.
[7] The method for manufacturing a wound body of a stretch film for packaging, which is performed by inserting a long stretch film before winding in the longitudinal direction.

[9]
The pair of cylindrical stretching rollers are arranged on the upstream side and the downstream side in the direction in which the long stretch film before the winding is inserted in the longitudinal direction, and the cylindrical stretching on the downstream side. [8] The method for winding a roll of a stretch film for packaging, wherein the roller rotates at a higher peripheral speed than the cylindrical stretching roller on the upstream side.

According to the present invention, it is possible to provide a winding body of an ultra-thin long stretch film, which can be easily peeled off from the winding body and pulled out at the time of use, and a winding manufacturing method thereof. it can.

The front view explaining an example of the winding body of the conventional stretch film for packaging. A perspective view in which a part of the film is omitted to explain a state in which the film is peeled off from a roll of a conventional stretch film for packaging and pulled out for use. The front view explaining an example of the winding body of the stretch film for packaging of one Embodiment of this invention. The perspective view which explained the state which peeled off the film from the winding body of the stretch film for packaging of one Embodiment of this invention, and pulled out and used. Schematic cross-sectional view of the wound body of the stretch film for packaging according to the embodiment of the present invention, in which a part explaining the structure on the outer peripheral (outer diameter) side of the long stretch film which is laminated to form a winding layer is omitted. .. It is a conceptual diagram explaining the process of one Embodiment of the winding manufacturing method of the winding body of the stretch film for packaging of this invention, (a) is a plan view, (b) is a side view corresponding to this. It is a figure explaining one embodiment of the pair of stretch rolls adopted in the stretching step in one embodiment of the winding manufacturing method of the winding body of the stretch film for packaging of this invention, omitting a part. (A), (b), and (c) are one embodiment of a pair of stretching rolls in the case where the stretching step is performed by embossing in one embodiment of the method for winding a wound body of a stretch film for packaging of the present invention. The figure explaining the form by omitting a part. (A) and (b) are a part of one embodiment of a pair of stretching rolls in the case where the stretching step is performed by embossing gear processing in one embodiment of the method for winding a wound body of a stretch film for packaging of the present invention. The figure which omits and explains.

(Stretch film roll for packaging)
An example of the winding body 11 of the stretch film for packaging of this embodiment will be described with reference to FIGS. 3 to 5.

As shown in FIGS. 3 and 4, the wrapping stretch film roll 11 of this embodiment is extremely thin (for example, having a wall thickness of about 6 to 30 μm) and has a long length of 300 m or more in the longitudinal direction. A long stretch film 14 having a size of about 500 m in the lateral direction, which is a direction orthogonal to the longitudinal direction, that is, a width of about 300 mm to 500 mm, is rolled into a roll.

In the embodiment shown in FIGS. 3 and 4, the long stretch film 14 is wound around a cylindrical hollow winding core 2.

In the wrapping body 11 of the stretch film for packaging shown in FIGS. 3 and 4, the long stretch film 14 is continuously provided with a plurality of portions having different wall thicknesses in the lateral direction of the long film 14. As a result, the air layers 17a, 17b, 17c, and 17d that are continuous in the longitudinal direction of the long stretch film 14 are stretched between the long stretch films 14 that are laminated to form the winding layer 13. There are a plurality of films 14 in the lateral direction.

FIG. 5 is a cross-sectional view in which a part of explaining the structure on the outer peripheral (outer diameter) side of the long stretch film 14 which is laminated to form the winding layer 13 is omitted. In FIG. 5, the upper side is the outer diameter side of the winding body 11, and the lower side is the inner diameter side of the winding body 11.

In the long stretch film 14 (FIG. 3) which is laminated to form the winding layer 13, the long stretch film 14a wound on the outermost side is from the side edge portion 18a which is the end edge portion in the lateral direction thereof. A thin-walled portion 15 g, a thick-walled portion 15c, a thin-walled portion 15f, a thick-walled portion 15b, a thin-walled portion 15e, a thick-walled portion 15a, and a thin-walled portion 15d are provided in the lateral direction toward the inside.

Similarly, in the long stretch film 14 (FIG. 3) that is laminated to form the winding layer 13, the long stretch film 14b that is on the inner diameter side of the long stretch film 14a in the radial direction is in the lateral direction. The thin-walled portion 16g, the thick-walled portion 16c, the thin-walled portion 16f, the thick-walled portion 16b, the thin-walled portion 16e, the thick-walled portion 16a, and the thin-walled portion 16d are formed from the side edge portion 18b, which is the edge portion, inward in the lateral direction. I have.

That is, in the long stretch film 14 wound around the winding core 2 in a roll shape, the thick portion and the thin portion continuous in the longitudinal direction thereof are alternately arranged in the lateral direction of the long stretch film 14. I have.

As a result, when the long stretch film 14 is wound around the winding core 2 to form a roll-shaped wound body, the long stretch film 14 is laminated between the long stretch films 14 forming the winding layer 13. The air layers 17a, 17b, 17c, and 17d that are continuous in the longitudinal direction of the stretch film 14 are present in the lateral direction of the long stretch film 14.

As a result, as shown in FIG. 4, when the tip side 5 in the longitudinal direction is fixedly grasped, the wrapping stretch film 14 is peeled off from the wrapping stretch film winding body 11, and the wrapping stretch film 14 is pulled out and used, the outermost side ( Since the air layers 17a, 17b, 17c, and 17d are present between the film 14a on the outer peripheral side) and the film 14b on the inner peripheral side thereof, the film 14a can be easily peeled off and pulled out.

In this embodiment, the long stretch film 14 is continuous in the longitudinal direction, and the portions having different wall thicknesses (thick part 15a, etc. and thin part 15d, etc.) are formed on the long stretch film 14. By providing a plurality of stretch films in the lateral direction, an air layer 17a, etc., which are continuous in the longitudinal direction of the long stretch film 14 between the stretch films that are laminated to form the winding layer 13, and the like are formed in the long stretch film 14. The structure was described in which a plurality of films are formed in the horizontal direction of the above.

Although not shown, instead of such a structure, the long stretch film 14 is provided with a plurality of portions having different wall thicknesses intermittently in the longitudinal direction in the lateral direction of the long stretch film 14. A plurality of air layers intermittently formed in the longitudinal direction of the long stretch film 14 are formed in the lateral direction of the long stretch film 14 between the stretch films that are laminated to form the winding layer 13. Even with the structure, as shown in FIG. 4, when the tip side 5 in the longitudinal direction is fixedly grasped, the packaging stretch film 14 is peeled off from the winding body 11 of the packaging stretch film, and the packaging stretch film 14 is pulled out and used. Since the air layer exists between the outermost (outer peripheral side) film and the film on the inner peripheral side thereof, the film can be easily peeled off and pulled out easily.

(Manufacturing method for winding a roll of stretch film for packaging)
The method for winding a roll of a stretch film for packaging according to this embodiment is an ultra-thin (for example, a wall thickness of about 6 to 30 μm), a long length in the longitudinal direction of about 300 m to 500 m, and a longitudinal length. As shown in FIG. 3, a roll of a stretch film for packaging is manufactured by winding a long stretch film having a size in the lateral direction, which is an orthogonal direction, that is, a width of about 300 mm to 500 mm, into a roll shape. The method.

In this embodiment, a plurality of portions having different wall thicknesses are continuously formed in the longitudinal direction of the long film with respect to the long stretch film before being wound into a roll shape, and these are formed by the cross-sectional area ratio. An air layer 17a, etc., which is continuously stretched in the longitudinal direction of the long stretch film 14 between the stretch films forming the winding layer 13 by being stretched 1.2 to 6 times and wound into a roll. Are made to exist in a plurality in the lateral direction of the long film 14. Alternatively, a plurality of air layers 17a, etc., which are intermittently formed in the longitudinal direction, are present in the lateral direction of the long stretch film.

In this case, for example, by forming a convex portion in the longitudinal direction of the long film with respect to the long stretch film before winding, a portion having a different wall thickness continuous in the longitudinal direction of the long film is formed. It is possible to adopt a step of forming a plurality of the films in the lateral direction and stretching them 1.2 to 6 times in cross-sectional area ratio.

For example, while partially stretching a long stretch film before winding, a plurality of portions having different wall thicknesses continuous in the longitudinal direction of the long film are formed in the lateral direction. Is stretched 1.2 to 6 times in cross-sectional area ratio.

FIG. 6 shows a schematic configuration of an example of an apparatus adopted in such a manufacturing process.

The original fabric 22 of the long stretch film before stretching is attached to the original fabric film holder 20 provided with the brake device 21.

The long stretch film unwound from the raw film holder 20 is stretched by a pair of stretching rolls 25. The pair of stretching rolls 25 can be, for example, a pair of embossing rolls, a pair of gear rolls, and a pair of grooved rollers.

The pair of stretching rolls 25 are driven by a drawing roll drive motor 23 and a drive gear 24 that interlocks the pair of stretching rolls 25. The draw ratio between the rolls in the pair of draw rolls 25 is set by, for example, a combination gear.

A case where the pair of stretching rolls 25 is composed of a pair of gear rolls will be described with reference to FIG.

The pair of gear rolls shown in FIG. 7 is a combination of a high-speed side gear 25a and a low-speed side gear 25b. For example, each gear roll has an outer diameter of 150 m / mφ, a groove depth of 15 mm, and an interval (P). Can be set to 15 mm and a reduction ratio of 1.0 to 3.0.

In FIG. 7, at the portion indicated by reference numeral A, stretching in the lateral direction is unlikely to occur because the gear 25b on the low speed side is pressed by the convex portion. On the other hand, in FIG. 7, at the portion indicated by reference numeral B, stretching in the lateral direction occurs by being guided by the high-speed side gear 25a. As a result, the long stretch film portion passing through the portion indicated by the reference numeral A in FIG. 7 has a thicker cross section (thickness) than the long stretch film portion passing through the portion indicated by the reference numeral B in FIG. The long stretch film portion passing through the portion indicated by the reference numeral B of No. 7 has a thinner (thinner) cross section than the long stretch film portion passing through the portion indicated by the reference numeral A in FIG.

As a result, a plurality of portions of the long stretch film having different wall thicknesses continuous in the longitudinal direction can be formed in the lateral direction.

The draw ratio increases due to the surface speed and biting (GAP) of the high-speed side gear 25a and the low-speed side gear 25b forming a pair of gear rolls.

In the pair of cylindrical stretching rolls 25 shown in FIG. 6A, for example, in the direction in which the long stretch film before winding is inserted in the longitudinal direction, as shown in FIG. 6A. In the pair of cylindrical stretching rolls 25 arranged on the upstream side and the downstream side, the stretching roller 25 on the downstream side rotates at a higher peripheral speed than the stretching roller 25 on the upstream side. can do.

With reference to FIG. 8, an example will be described in which a plurality of portions having different wall thicknesses intermittently in the longitudinal direction of a long film are formed in the lateral direction by embossing.

The pair of gear rolls shown in FIG. 8 is formed by a pair of embossed rolls 25c and 25d (FIG. 8A). When the embossed rolls 25c and 25d are matched, the film is as shown in FIG. 8 (b), and when the embossed rolls 25c and 25d are displaced, the film is as shown in FIG. 8 (c). A plurality of portions having different wall thicknesses are formed on the surface of the long film intermittently in the longitudinal direction of the long film in the lateral direction of the long film.

With reference to FIG. 9, an example will be described in which a plurality of portions having different wall thicknesses intermittently in the longitudinal direction of a long stretch film are formed in the lateral direction by embossing gear processing.

According to the embossed gear processing shown in FIG. 9, stretching in the longitudinal direction (rotational direction) is performed by the unevenness of the gear, and the notch groove portion is not stretched but becomes a thick portion.

As described above, a long film in which a plurality of portions having different wall thicknesses continuous in the longitudinal direction are formed in the lateral direction, or a plurality of portions having intermittently different wall thicknesses in the longitudinal direction are formed in the lateral direction. The formed long film is subsequently sent to the film extension.

In the embodiment shown in FIG. 6, first, the film is expanded by the wrinkle removing and film expansion guide rolls 26 arranged on the downstream side of the pair of stretching rolls 25.

The wrinkle removing and film expansion guide roll 26 of the illustrated embodiment is composed of a plurality of wrapping rubber rolls having a continuously small outer diameter at the center.

A pair of stretching rolls 27 are subsequently arranged on the downstream side of the wrinkle removing and film expansion guide rolls 26. The pair of stretching rolls 27 are, for example, rubber rolls, which are composed of an upper low-speed side roll and a lower high-speed side roll in FIG. 6B (the gap between the rolls is, for example, 1 to 5 mm) in the longitudinal direction. Stretching to is performed.

The stretching in the longitudinal direction here is, for example, the treatment with a pair of stretching rolls 25 by embossing rolls, and the portion of the long film whose wall thickness is intermittently different in the longitudinal direction is laterally stretched. In the case of a plurality of moldings, the long film after such treatment is stretched in the longitudinal direction.

Further, when the treatment with the pair of stretching rolls 25 is performed by something other than the embossing rolls, the stretching treatment with the pair of stretching rolls 27 has physical characteristics in the longitudinal (longitudinal) direction (MD) and the biaxial lateral direction (TD). It becomes a stretching process for optimizing.

The pair of stretching rolls 27 are rotationally driven by a drive motor 29, and are stretched in the longitudinal direction by a pair of nip rolls 30 interlocked by a drive interlocking gear 28 located on the downstream side of the pair of stretching rolls 27. The broken long film is taken over. In the figure, reference numeral 31 is a take-up shaft and a paper tube holder.

After that, it is wound by the winding roll 32 driven by the winding drive motor 33.

In this way, the winding body 11 of the stretch film for packaging of this embodiment described with reference to FIGS. 3 to 5 is wound and manufactured.

When plastic is stretched, a phenomenon called shrinkage occurs. Utilizing this, streaks are made in the plastic film and stretched, and the shrinkage difference after stretching between the streaks (thick part) and the valleys of the streaks (thin part) is used to twist the plastic film. , A technique for generating wrinkles and giving a voluminous feeling and a soft feeling to a string made from such a plastic film is known (Non-Patent Document 1).

While partially stretching the long stretch film before winding is performed as described above, a plurality of portions having different wall thicknesses continuous in the longitudinal direction of the long stretch film are formed in the lateral direction. The process utilizes this technique.

In this way, a plurality of portions having different wall thicknesses are continuously formed in the longitudinal direction of the long stretch film with respect to the long stretch film before being wound into a roll shape, and these are formed by the cross-sectional area ratio. An air layer 17a, etc., which is continuously stretched in the longitudinal direction of the long stretch film 14 between the stretch films forming the winding layer 13 by being stretched 1.2 to 6 times and wound into a roll. Are made to exist in the horizontal direction.

As described above with reference to FIGS. 6 to 9, stretching by a pair of stretching rolls 25 including a pair of embossing rolls, a pair of gear rolls, a pair of grooved rollers, etc., wrinkle removing, and a film by a film expansion guide roll 26. By expansion and stretching in the longitudinal direction by a pair of stretching rolls 27, for example, a conventional long stretch wound around a winding body of a conventional stretching film for packaging which is set so as to be fed and rotatably set on the feeding side of the raw film. When the film has a wall thickness of 23 μm and a width of 250 mm, it is stretched twice in the width direction and twice in the longitudinal direction. A long stretch film formed in a plurality of directions is formed, which is wound by a winder, and the winding body 11 of the packaging stretch film of this embodiment described with reference to FIGS. 3 to 5 is wound and manufactured. can do.

Further, as described above, when the winding body 11 of the packaging stretch film of the embodiment is wound and manufactured, the side edge portion of the winding body of the roll-shaped packaging stretch film wound around the tubular core (FIG. 5). Reference numerals 18a, 18b, 18c, and 18d) are unstretched and are wound on the roll of the conventional stretch film for packaging, which is set to be rotatably fed on the feed side of the raw film. The wall thickness of the shaku stretch film can be almost maintained. Therefore, it is possible to reduce the possibility of breakage when the film is pulled out and used due to scratches or damage on the side edges of the roll-shaped stretch film for packaging wound around the tubular core.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, and can be variously modified within the technical scope grasped from the description of the claims. ..

For example, as described above, instead of forming a plurality of portions having different wall thicknesses continuously in the longitudinal direction of the long stretch film with respect to the long stretch film before being wound into a roll shape, It is possible to form a plurality of portions having different wall thicknesses intermittently in the longitudinal direction.

In this case, for example, embossing is performed on the long stretch film before winding, or pressing a stamp having a predetermined shape on the long stretch film before winding is performed. Therefore, it is possible to form a plurality of portions having different wall thicknesses intermittently in the longitudinal direction of the long film.

1, 11 Wrapping stretch film winding body 2 Cylindrical hollow winding core 3, 13 Rolling layer 4, 14 Long stretch film 5 Tip side 14a outermost (outer diameter side) in the longitudinal direction of the packaging stretch film Long stretch film 14b wrapped around the outermost (outermost diameter side) long stretch film with a single inner diameter 15d, 15e, 15f, 15g, 16d, 16e, 16f, 16g Thin parts 15a, 15b , 15c, 16a, 16b, 16c Thick part 17a, 17b, 17c, 17d Air layer 18a, 18b Side edge part 20 Original film holder 21 Brake device 22 Original fabric of long stretch film before stretching 23 Drive for stretching roll Motor 24 Drive gear 25 Pair of stretching rolls 25a High-speed side gear 25b Low-speed side gear 25c, 25d Pair of embossing rolls 26 Wrinkle removal and film expansion guide roll 27 Pair of stretching rolls 28 Drive interlocking gear 29 Drive motor 30 Pair of nip rolls 31 windings Winding shaft, paper tube holder 33 Winding drive motor 32 Winding roll

Claims (8)

It is a roll of stretch film for packaging, which is made by rolling an ultra-thin long stretch film into a roll.
A plurality of portions having different wall thicknesses continuous in the longitudinal direction of the long stretch film are provided in the lateral direction of the long stretch film.
Alternatively, a plurality of portions having different wall thicknesses intermittently in the longitudinal direction of the long stretch film are provided in the lateral direction of the long stretch film.
The long air layer is continuous in the longitudinal direction of the elongated stretch film between the film each other to form a laminated by winding layers, there are a plurality in the transverse direction of the long stretch film,
Alternatively, a plurality of air layers intermittent in the longitudinal direction of the long stretch film are present between the films that are laminated to form a winding layer in the lateral direction of the long stretch film. Winding body. This is a manufacturing method for winding a roll of stretch film for packaging, which winds an ultra-thin long stretch film into a roll.
A plurality of portions having different wall thicknesses continuous in the longitudinal direction of the long stretch film with respect to the long stretch film before being wound into a roll shape are formed in the lateral direction of the long stretch film, or A plurality of portions having different wall thickness formed intermittently in the longitudinal direction are formed in the lateral direction of the long stretch film, stretched 1.2 to 6 times in cross-sectional area ratio, and wound into a roll. As a result, between the films that are laminated to form a winding layer, a plurality of air layers that are continuous in the longitudinal direction of the long stretch film are formed in the lateral direction of the long stretch film, or in the longitudinal direction. A method for winding a winding body of a stretch film for packaging in which a plurality of intermittently formed air layers are present in the lateral direction of the long stretch film . A plurality of uneven portions continuous in the longitudinal direction of the long stretch film are formed in the lateral direction of the long stretch film with respect to the long stretch film before the winding is performed, and these are formed by the cross-sectional area ratio. Stretch 1.2 to 6 times
The method for producing a roll of a stretch film for packaging according to claim 2. By embossing the long stretch film before the winding is performed , a plurality of portions having different wall thicknesses are intermittently formed in the longitudinal direction, and a plurality of the long stretch films are formed in the lateral direction. The method for winding a roll of a stretch film for packaging according to claim 2, wherein the film is stretched 1.2 to 6 times in cross-sectional area ratio. By pressing a stamp having a predetermined shape against the long stretch film before the winding is performed, portions having different wall thicknesses in the longitudinal direction of the long stretch film are intermittently formed, and the long stretch film is formed. The method for winding a roll of a stretch film for packaging according to claim 2, wherein a plurality of films are formed in the lateral direction and the film is stretched 1.2 to 6 times in cross-sectional area ratio. While partially stretching the long stretch film before the winding is performed , the portions having different wall thicknesses continuous in the longitudinal direction of the long stretch film are formed on the side of the long stretch film. The method for winding a roll of a stretch film for packaging according to claim 2, wherein a plurality of films are formed in the direction and the film is stretched 1.2 to 6 times in cross-sectional area ratio. While partially stretching the long stretch film before the winding is performed , the portions having different wall thicknesses continuous in the longitudinal direction of the long film are formed in the lateral direction of the long film. The process of molding multiple
A pair of cylindrical stretching rollers that are provided with outer peripheral ridges and outer peripheral groove portions alternately in a direction in which the central axis extends and that rotate about the central axis are the one of the cylindrical stretching rollers. With respect to a stretching roller in which the outer peripheral ridge portion is arranged so as to mesh with the outer peripheral groove portion of the other cylindrical stretching roller.
The method for manufacturing a roll of a stretch film for packaging according to claim 6 , wherein the long stretch film before being wound is inserted in the longitudinal direction. The pair of cylindrical stretching rollers are arranged on the upstream side and the downstream side in the direction in which the long stretch film before the winding is inserted in the longitudinal direction, and the cylindrical stretching on the downstream side. The method for winding a roll of a stretch film for packaging according to claim 7 , wherein the roller rotates at a higher peripheral speed than the cylindrical stretching roller on the upstream side.

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