JP2019069801A - Winding body of stretch film for packaging and winding manufacturing method of the winding body - Google Patents

Abstract

To provide a winding body of stretch film for packaging which is a winding body for an ultrathin long stretch film, and in which the stretch film for packaging can be easily peeled from the winding body and drawn out when used, and to provide a winding manufacturing method of the winding body.SOLUTION: In a winding body 11 of stretch film for packaging, an ultrathin long stretch film 14 is wound in a roll shape, and a plurality of air layers continuing in the longer direction of the long stretch film exist between the films laminated and forming a wound layer in the lateral direction of the long stretch film, or a plurality of air layers formed intermittently in the longer direction exist in the lateral direction of the long stretch film. The winding body of stretch film for packaging winds the ultrathin long stretch film in a roll shape.SELECTED DRAWING: Figure 3

Description

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

  A stretch film for packaging that is wound around an article etc. and used to pack and package the article etc. for the purpose of preventing load collapse during transportation of the article etc., preventing shape collapse, or protecting the article etc., waterproofing etc. (Patent Document 1).

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

  As a manufacturing method, blow molding (inflation film forming method), T-die molding (cast film molding) or the like is used. In addition, there is also a manufacturing method in which a film formed by these methods is drawn by secondary processing to obtain a pre-stretched film which is a thin and toughened film.

  Such a long film is wound around a cylindrical core 2 as shown in FIG. 1 and FIG. 2, and is provided on the market as a wound film 1 of a stretch film for packaging. As the cylindrical core, a hollow cylindrical paper pipe, a plastic pipe or the like is adopted, and 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 cylindrical winding core 2 is usually about 10 mm at the minimum.

  As shown in FIG. 2, when the stretch film 4 for packaging is peeled off from the winding film 1 for stretch film for packaging and pulled out for use, the end side 5 in the longitudinal direction is held fixedly, stretched and stretched While pulling (while stretching), it is pulled out and wound around the article. The surface of the packaging stretch film is tacky and the article is fixed by winding while applying tension. By stretching (stretching) while stretching under tension, the adhesive film (which does not adhere to the articles) of the packaging stretch film laminated on the outer periphery of the articles, etc. With the residual tension, it can exhibit functions such as load collapse prevention.

  The applicant of the present application has also proposed a winding body of a packaging stretch film without a winding core and a method for producing the same (Patent Documents 2 and 3). The purpose is to eliminate shrinkage deformation during storage and deformation during transportation and handling, and to suppress transportation costs without being bulky in the same way as packaging stretch film rolls wound around a cylindrical core. It was

  A roll of packaging stretch film is used in a manual winding operation where an operator holds a film and stretches it while hand stretching it, or a machine that winds around an article etc. while stretching with a machine such as a stretch packaging machine. Used for winding work.

  In general, the wound film of the stretch film for packaging to be subjected to the manual winding operation is a long film having a thickness of 6 to 25 μm and a width of about 300 mm to 500 mm.

  In the case of a conventional type in which the stretch film for packaging used in the machine winding operation is not stretched while being wound, a long film with a thickness of 12 to 20 μm and a width of about 500 mm, prestretched type stretched significantly before winding In the case of the above, it is general that the film is a long film having a thickness of 20 to 30 μm and a width of about 500 mm.

Japanese Utility Model Application Publication No. 63-123563 JP 2004-131169 A JP, 2004-137073, A Unexamined-Japanese-Patent No. 3-226414

"Considerations of hand binding materials and soft ropes that are tied by hand" (Suzuki Kenichi) "Packaging technology JPI Journal April 2016 Japan Packaging Technology Association 50-55"

  The stretch film for packaging is the technology development of linear low density polyethylene resin (LLDPE) used as the main raw material, etc., and it is easy to stretch and has excellent moldability etc. It was generalized at once.

  Furthermore, LLDPE resin is to be used in this technical field as a resin with additional features, also called m-LLDPE, by development of metallocene catalyst, and packaging stretch film is widely used in the market. It has become.

  Such a packaging stretch film has extremely stretchability, excellent toughness (strength), and tear resistant properties (excellent tear strength, puncture strength), so it can be made thinner. I'm going forward.

  In particular, since the amount used has rapidly increased, in recent years, thinning has further progressed from the viewpoint of the problem of processing as industrial waste, environmental measures, and further, from the viewpoint of manufacturing cost and the like.

  On the other hand, when thinning of the film proceeds, the stretch film has adhesiveness, so it is difficult to peel off, and it becomes difficult to peel and pull out.

  In addition, it is not only difficult to peel off due to thinning of the film, but it is broken when pulled out and used due to scratches on the side edge of the roll-like packaging stretch film wound around the cylindrical core 2 or damage. It becomes easy to do.

  Further, in the case of a roll-like wrapping stretch film wound around a cylindrical winding core, the width is as large as 300 mm to 500 mm as compared with the diameter (about 50 to 75 mm) of the winding core serving as the center. As film thinning progresses, it takes time to completely pull out the film.

  Therefore, the present invention proposes to propose a roll of packaging stretch film which can be easily peeled off from the roll at the time of use with a roll of extremely thin stretch film, and a method for winding and winding the same. I am aiming for the purpose.

[1]
A roll of packaging stretch film in which an extremely thin stretch film is wound in a roll, which is continuous in the longitudinal direction of the stretch film between stretch films which are laminated to form a roll layer. A plurality of air layers formed in the lateral direction of the long stretch film or a plurality of air layers formed intermittently in the longitudinal direction are present in the lateral direction of the long stretch film. Roll of film.

[2]
In the air layer, the long stretch film has a plurality of portions having different thicknesses continuously in the longitudinal direction or intermittently in the longitudinal direction in the lateral direction of the long stretch film A roll of stretch film for packaging used in [1].

[3]
A method of winding and producing a roll of packaging stretch film, comprising winding a very thin long stretch film in a roll.
With respect to the long stretch film before being wound into a roll, a plurality of portions of different thickness which are continuous in the longitudinal direction of the long stretch film, in the lateral direction of the long stretch film, or A plurality of portions having different thicknesses which are formed intermittently in the longitudinal direction are formed in the lateral direction of the long stretch film, and this is stretched by 1.2 to 6 times in a cross sectional area ratio and wound in a roll shape Between stretch films that are laminated to form a wound layer, a plurality of air layers continuing in the longitudinal direction of the long stretch film in the lateral direction of the long film, or in the longitudinal direction A method of winding and producing a roll of a stretch film for packaging, wherein a plurality of air layers formed intermittently are present in the transverse direction of the long stretch film.

[4]
A plurality of concavo-convex portions continuing in the longitudinal direction of the long stretch film are formed in the transverse direction of the long stretch film with respect to the long stretch film before the winding is performed, The method for winding and manufacturing the wound film for packaging stretch film according to [3], which is stretched by 1.2 to 6 times.

[5]
By embossing the long stretch film before the winding is performed, the portions having different thicknesses are interrupted in the longitudinal direction, and a plurality of cross sections of the long stretch film are formed, The film is stretched by 1.2 to 6 times in cross-sectional area ratio [3] The method for winding and manufacturing the wound film for packaging stretch film.

[6]
By pressing a pressing die of a predetermined shape against the long stretch film before the winding is performed, a portion having a different thickness in the longitudinal direction of the long stretch film is interrupted to cross the long film. A method for winding and manufacturing a wound film for a packaging stretch film according to [3], wherein a plurality of moldings are formed in a direction and the cross-sectional area ratio is stretched 1.2 to 6 times.

[7]
The portions of different thickness continuous in the longitudinal direction of the long stretch film while partially stretching the long stretch film before the winding is performed A method for winding and manufacturing a wound film for a packaging stretch film according to [3], wherein a plurality of layers are formed in a direction and stretched by 1.2 to 6 times in cross-sectional area ratio.

[8]
The portions of different thickness continuous in the longitudinal direction of the long stretch film while partially stretching the long stretch film before the winding is performed The process of forming multiple in the direction is
The pair of cylindrical stretching rollers provided with the outer peripheral ridges and the outer peripheral groove in a direction in which the central axis extends alternately and which rotates about the central axis are the above-mentioned cylindrical ones of the cylindrical drawing rollers. With respect to a drawing roller in which an outer peripheral ridge portion is disposed in a structure in which it engages with the outer peripheral groove of the other cylindrical drawing roller,
The method for winding and manufacturing the wound film for a packaging stretch film of [7], which is performed by inserting the long stretch film before the winding is performed in the longitudinal direction.

[9]
The pair of cylindrical stretching rollers are disposed on the upstream side and the downstream side in the direction in which the long stretch film is inserted in the longitudinal direction before the winding is performed, and the cylindrical stretching on the downstream side A method for winding and producing a wrap film for a packaging stretch film of [8], 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 roll of packaging stretch film which can be easily peeled off and pulled out of the roll at the time of use with a roll of extremely thin stretch film, and a method for winding and manufacturing the roll. it can.

The front view explaining an example of the roll of the conventional stretch film for packaging. The film is peeled off from the winding body of the conventional packaging stretch film, and the perspective view which abbreviate | omitted one part explaining the state used and pulled out and used. BRIEF DESCRIPTION OF THE DRAWINGS The front view explaining an example of the roll of the stretch film for packaging of one Embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS The perspective view which abbreviate | omitted one part explaining the state which peels off a film from the roll of the stretch film for packaging of one Embodiment of this invention, and it draws out and uses it. The roll of the stretch film for packaging of one Embodiment of this invention WHEREIN: The schematic sectional view which abbreviate | omitted one part explaining the structure of the outer peripheral (outer diameter) side of the long stretch film which is laminated | stacked and forms the winding layer. . It is a conceptual diagram explaining the process of one Embodiment of the winding-up manufacturing method of the roll of the stretch film for packaging of this invention, (a) is a top view, (b) is a side view corresponding to this. The figure which abbreviate | omits one part and demonstrates one Embodiment of a pair of extending | stretching roll employ | adopted at an extending process in one Embodiment of the winding-up manufacturing method of the roll of the stretch film for packaging of this invention. (A), (b) and (c) are an embodiment of a pair of stretching rolls in the case where the stretching step is performed by embossing in one embodiment of the winding and producing method of the wound film for packaging of the present invention. The figure which abbreviate | omits one part and demonstrates a form. (A) and (b) show a part of one embodiment of a pair of stretching rolls in the case where the stretching process is performed by embossing gear processing in one embodiment of the winding production method of the wound film for packaging of the present invention. The figure which omits and explains.

(Wound film of stretch film for packaging)
An example of the roll 11 of the stretch film for packaging of this embodiment is demonstrated using FIGS. 3-5.

  The wrap film 11 of the stretch film for packaging of this embodiment has an extremely thin (for example, a wall thickness of about 6 to 30 μm) and a long longitudinal length of 300 m as shown in FIGS. 3 and 4. A long stretch film 14 having a size of about 500 m and a width in the lateral direction which is a direction orthogonal to the longitudinal direction, that is, about 300 mm to 500 mm, is wound in 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 winding film 11 of the packaging stretch film shown in FIGS. 3 and 4, the long stretch film 14 has a plurality of portions having different thicknesses continuously in the longitudinal direction, in the lateral direction of the long film 14 The air layers 17a, 17b, 17c and 17d continuous in the longitudinal direction of the long stretch film 14 between the long stretch films 14 that are laminated to form the wound layer 13 are long stretches. A plurality of films 14 exist in the lateral direction of the film 14.

  FIG. 5: is sectional drawing which abbreviate | omitted one part explaining the structure by the side of the outer periphery (outer diameter) of the elongate stretch film 14 which is laminated | stacked and has formed the winding layer 13. As shown in FIG. 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.

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

  Similarly, in the long stretch film 14 (FIG. 3) which is laminated to form the wound layer 13, the long stretch film 14b which is on the inner diameter side of the long stretch film 14a in the radial direction is in the lateral direction. The thin wall 16g, the thick wall 16c, the thin wall 16f, the thick wall 16b, the thin wall 16e, the thick wall 16a, and the thin wall 16d are arranged inward in the lateral direction from the side edge 18b, which is the edge. Have.

  That is, the long stretch film 14 wound in the form of a roll around the winding core 2 alternately has thick portions continuous in its longitudinal direction and thin portions in the lateral direction of the long stretch film 14. Have.

  As a result, when the long stretch film 14 is rolled around the winding core 2 or the like to form a roll-like wound body, the long stretch film 14 is stacked to form the winding layer 13. The air layers 17 a, 17 b, 17 c, 17 d continuous in the longitudinal direction of the stretch film 14 are configured to be present in the lateral direction of the long stretch film 14.

  As a result, as shown in FIG. 4, the distal end side 5 in the longitudinal direction is gripped in a fixed manner, and the packaging stretch film 14 is peeled from the wrap film 11 for packaging and pulled out for use. Since the air layers 17a, 17b, 17c, and 17d are present between the film 14a on the outer peripheral side and the film 14b further on the inner peripheral side, the film 14a is easily peeled off and easily pulled out.

  In this embodiment, the long stretch film 14 is continuous in its longitudinal direction, and the portions with different thickness (thick portion 15a, etc., thin portion 15d, etc.) By providing a plurality in the lateral direction, the air layers 17 a and the like continuous in the longitudinal direction of the long stretch film 14 between the stretch films which are laminated to form the wound layer 13 are the long stretch film 14. It has been described in the structure in which a plurality of crosswise directions are formed.

  Although not shown, in place of such a structure, the long stretch film 14 is provided with a plurality of portions having different thicknesses which are interrupted in the longitudinal direction thereof in the lateral direction of the long stretch film 14. A plurality of air layers formed intermittently 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 laminated to form the wound layer 13 In the structure, as shown in FIG. 4, when the front end side 5 in the longitudinal direction is gripped fixedly, the stretch film 14 for packaging is peeled off from the roll 11 of the stretch film for packaging and pulled out for use. The presence of an air layer between the outermost film (outer side) and the film further inner side makes the film easy to peel off and easy to pull out. Rukoto can.

(How to roll up and wind a stretch film for packaging)
The method for winding and winding the stretch film for packaging according to this embodiment is extremely thin (for example, with a thickness of about 6 to 30 μm), and the length in the longitudinal direction to be long is about 300 m to about 500 m in the longitudinal direction As shown in FIG. 3, as illustrated in FIG. 3, a roll of a stretch film for packaging stretch film is used to roll a long stretch film having a size in the crosswise direction which is the orthogonal direction, ie, a width of about 300 mm to 500 mm. It is a method.

  In this embodiment, a plurality of portions having different 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 the cross sectional area ratio is determined The air layer 17a is continuously extended in the longitudinal direction of the long stretch film 14 between the stretch films which are laminated to form the wound layer 13 by being stretched by 1.2 to 6 times and wound in a roll. Are present in the lateral direction of the long film 14. Alternatively, a plurality of air layers 17a and the like formed intermittently in the longitudinal direction may be provided 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 being wounded, a portion having a different thickness which is continuous in the longitudinal direction of the long film A step of forming a plurality of these in the lateral direction and stretching this in a cross-sectional area ratio of 1.2 to 6 times can be employed.

  For example, while partially stretching the long stretch film before being wounded, a plurality of portions having different thicknesses which are 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 employed in such a manufacturing process.

  A long stretch film original fabric 22 before stretching is attached to an original film holder 20 provided with a 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 is driven by a stretching roll drive motor 23 and a drive gear 24 that interlocks the pair of stretching rolls 25. The draw ratio between rolls in the pair of draw rolls 25 is set by, for example, a combination gear.

  The case where the pair of stretching rolls 25 is configured by 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 the high speed gear 25a and the low speed gear 25b. For example, the outer diameter of each gear roll is 150 m / mφ, the groove depth is 15 mm, and the distance (P) Can be set to 15 mm and a reduction ratio of 1.0 to 3.0.

  In FIG. 7, in the portion indicated by the reference symbol A, stretching in the lateral direction is less likely to occur by being pressed by the convex portion of the low speed gear 25 b. On the other hand, at a portion indicated by reference numeral B in FIG. 7, stretching in the lateral direction occurs by being induced by the high speed gear 25 a. As a result, the long stretch film portion passing through the portion indicated by symbol A in FIG. 7 is thicker (thick) in cross section than the long stretch film portion passing through the portion indicated by symbol B in FIG. The long stretch film portion passing through the portion indicated by the symbol B of 7 has a thin (thin) cross section as compared with the long stretch film portion passing through the portion indicated by the symbol A in FIG.

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

  The drawing ratio is increased by the surface speed of the high speed gear 25a and the low speed gear 25b forming the pair of gear rolls, and the biting (GAP).

  In the pair of cylindrical stretching rolls 25 shown in FIG. 6 (a), for example, as shown in FIG. 6 (a), in the direction in which the long stretch film is wound in the longitudinal direction before being wound up. The downstream stretching roller 25 in the pair of cylindrical stretching rolls 25 disposed on the upstream side and the downstream side rotates at a peripheral speed higher than that of the upstream stretching roller 25 can do.

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

  The pair of gear rolls shown in FIG. 8 is formed of a pair of embossing rolls 25c and 25d (FIG. 8 (a)). When the emboss rolls 25c, 25d coincide with each other, as shown in FIG. 8 (b), when the emboss rolls 25c, 25d shift, as shown in FIG. 8 (c), the long stretch film A plurality of portions of different thickness are formed in the surface direction of the long film intermittently in the longitudinal direction of the long film in the lateral direction of the long film.

  An example will be described with reference to FIG. 9 in which a plurality of portions having different thicknesses are intermittently formed in the transverse direction in the longitudinal direction of the long stretch film 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, the portions of different thickness which are continuous in the longitudinal direction are long films formed in a plurality in the lateral direction, or the portions whose thickness is different intermittently in the longitudinal direction are a plurality of in the lateral direction. The formed long film is subsequently sent to the film extension.

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

  The de-wrinkling and film-expanding guide roll 26 of the illustrated embodiment is comprised of a plurality of flared rubber rolls with a continuously decreasing outer diameter at the center.

  A pair of draw rolls 27 are disposed downstream of the wrinkle removal and film expansion guide roll 26. The pair of stretching rolls 27 is, for example, a rubber roll, and consists of an upper low speed side roll and a lower high speed side roll in FIG. 6B (a gap between the rolls is, for example, 1 to 5 mm). Stretching is performed.

  The stretching in the longitudinal direction here is, for example, the treatment with the pair of stretching rolls 25 by the embossing roll, and in the longitudinal direction of the long film, a portion having different thickness intermittently in the transverse direction In the case of multiple molding, the long film after such treatment is stretched in the longitudinal direction.

  Further, when the treatment with the pair of drawing rolls 25 is other than the embossing roll, the drawing treatment with the pair of drawing rolls 27 has physical properties in the longitudinal (longitudinal) direction (MD) and the biaxial transverse direction (TD) It becomes a stretching process to optimize the

  The pair of stretching rolls 27 are rotationally driven by the drive motor 29 and stretched in the longitudinal direction by the pair of nip rolls 30 interlocked by the drive interlocking gear 28 positioned downstream of the pair of stretching rolls 27. The long film is taken away. In the drawing, reference numeral 31 denotes a winding shaft and a paper tube holder.

  Thereafter, it is taken up by the take-up roll 32 driven by the take-up drive motor 33.

  Thus, the roll 11 of the stretch film for packaging of this embodiment described with reference to FIGS. 3 to 5 is wound and manufactured.

  The plastic causes a phenomenon of contraction by drawing. Taking advantage of this, draw streaks in the plastic film, and stretch it to make a scratch on the plastic film using the difference in shrinkage after stretching between the streaks (thick part) and the valley of the streak (thin part) There is known a technique for generating wrinkles and giving a feeling of volume and softness to a string made from such a plastic film (Non-Patent Document 1).

  As described above, while partially stretching the long stretch film before being wounded, a plurality of portions having different thicknesses which are continuous in the longitudinal direction of the long stretch film are formed in the lateral direction. The process utilizes this technology.

  Thus, a plurality of portions of different thickness continuously formed in the longitudinal direction of the long stretch film with respect to the long stretch film before being wound into the roll shape are formed in the crosswise direction, The air layer 17a is continuously extended in the longitudinal direction of the long stretch film 14 between the stretch films which are laminated to form the wound layer 13 by being stretched by 1.2 to 6 times and wound in a roll. In the lateral direction.

  As described above with reference to FIGS. 6 to 9, the film by the drawing, the wrinkle removal and the film expansion guide roll 26 by the pair of drawing rolls 25 comprising the pair of embossing rolls, the pair of gear rolls, the pair of grooved rollers, etc. A conventional long stretch wound on a roll of a conventional packaging stretch film which is set so as to be drawn out and rotated to the original film side by expansion, drawing in the longitudinal direction by a pair of drawing rolls 27, for example. When the film has a thickness of 23 μm and a width of 250 mm, it is stretched by 2 times in the width direction and twice in the longitudinal direction, and 6 μm in thickness and 500 mm in width A long stretch film formed in a plurality of directions, which is wound by a winder, is described with reference to FIGS. The winding film 11 for packaging stretch film can be wound and manufactured.

  In addition, as described above, when the wound body 11 of the packaging stretch film of the embodiment is wound and manufactured, the side edge portion of the roll of the packaging stretch film wound around the cylindrical core (see FIG. 5). The parts indicated by reference numerals 18a, 18b, 18c and 18d are not stretched and the conventional long film is wound around a roll of a conventional packaging stretch film which is unrolled to the original film unwinding side and is rotatably set. The thickness of the stretch film can be almost maintained. Therefore, it is possible to reduce the possibility that breakage may occur when it is pulled out and used due to scratches, damage or the like of the side edge of the roll of the packaging stretch film for winding wound around a cylindrical 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 various modifications can be made within the technical scope understood from the description of the claims. .

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

  In this case, for example, embossing may be performed on the long stretch film before being wounded, or a pressing die having a predetermined shape may be pressed on the long stretch film before being wounded. Thus, it is possible to form a plurality of portions with different wall thicknesses intermittently in the longitudinal direction of the long film.

1, 11 winding film for packaging stretch film 2 cylindrical hollow winding core 3, 13 winding layer 4, 14 long stretch film 5 front end side 14a in the longitudinal direction of the stretch film for packaging (outside diameter side) Long stretch film 14b wound from the outermost (outermost diameter side) long stretch film to inner stretch film of long stretch film 15d, 15e, 15f, 15g, 16d, 16e, 16f, 16g thin walled part 15a, 15b , 15c, 16a, 16b, 16c thick parts 17a, 17b, 17c, 17d air layers 18a, 18b side edges 20 original film holder 21 brake device 22 original stretch of long stretch film before stretching 23 drive for stretching roll Motor 24 Drive gear 25 A pair of drawing rolls 25a High speed gear 25b Low speed gear 25c, 25d A pair of embossing rolls 26 A wrinkle removal and film expansion guide roll 27 A pair of drawing rolls 28 A drive interlocking gear 29 A drive motor 30 A pair of nip rolls 31 A winding shaft, paper tube holder 33 A winding drive motor 32 A winding roll

Claims (9)

  It is a roll of a packaging stretch film in which a very thin stretch film is wound in a roll, and is continuous in the longitudinal direction of the stretch film between the films which are laminated to form a roll layer. Packaging stretch film in which a plurality of air layers are formed in the lateral direction of the long stretch film, or a plurality of air layers formed intermittently in the longitudinal direction are present in the lateral direction of the long stretch film Roll of.   In the air layer, the long stretch film has a plurality of portions having different thicknesses continuously in the longitudinal direction or intermittently in the longitudinal direction in the lateral direction of the long stretch film A roll of the stretch film for packaging according to claim 1, which is formed by A method of winding and producing a roll of packaging stretch film, comprising winding a very thin long stretch film in a roll.
A plurality of portions having different thicknesses which are 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 plural in the lateral direction of the long film, or Forming a plurality of portions having different thicknesses which are formed intermittently in the longitudinal direction in the transverse direction of the long stretch film, and stretching it by 1.2 to 6 times in a cross sectional area ratio and winding it in a roll shape Between the films that are laminated to form a wound layer, a plurality of air layers continuing in the longitudinal direction of the long stretch film in the lateral direction of the long stretch film, or intermittent in the longitudinal direction A plurality of air layers formed in the same direction in the lateral direction of the long stretch film; A plurality of concavo-convex portions continuing in the longitudinal direction of the long stretch film are formed in the transverse direction of the long stretch film with respect to the long stretch film before the winding is performed, The method for winding and manufacturing the wound film for packaging stretch film according to claim 3, wherein the film is stretched 1.2 to 6 times. By embossing the long stretch film before the winding is performed, the portions having different thicknesses are interrupted in the longitudinal direction, and a plurality of cross sections of the long stretch film are formed, The film is stretched by 1.2 to 6 times in cross-sectional area ratio. By pressing a pressing die of a predetermined shape against the long stretch film before the winding is performed, a portion having a different thickness in the longitudinal direction of the long stretch film is interrupted to cross the long film. The method for winding and manufacturing the wound film for a packaging stretch film according to claim 3, wherein a plurality of moldings are formed in a direction and the cross-sectional area ratio is stretched to 1.2 to 6 times. The portions of different thickness continuous in the longitudinal direction of the long stretch film while partially stretching the long stretch film before the winding is performed The method according to claim 3, wherein a plurality of layers are formed in the direction and stretched in a cross sectional area ratio of 1.2 to 6 times. A portion of different thickness which is continuous in the longitudinal direction of the long film while performing a partial stretching process on the long stretch film before the winding is performed, in the lateral direction of the long film The process of molding multiple
The pair of cylindrical stretching rollers provided with the outer peripheral ridges and the outer peripheral groove in a direction in which the central axis extends alternately and which rotates about the central axis are the above-mentioned cylindrical ones of the cylindrical drawing rollers. With respect to a drawing roller in which an outer peripheral ridge portion is disposed in a structure in which it engages with the outer peripheral groove of the other cylindrical drawing roller,
The method according to claim 7, wherein the long stretch film before being wound up is inserted in the longitudinal direction. The pair of cylindrical stretching rollers are disposed on the upstream side and the downstream side in the direction in which the long stretch film is inserted in the longitudinal direction before the winding is performed, and the cylindrical stretching on the downstream side 9. The method according to claim 8, wherein the roller rotates at a peripheral speed higher than that of the cylindrical stretching roller on the upstream side.

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