JP2021147072A - Shrink package - Google Patents

Abstract

To provide a shrink package capable of manually and efficiently removing packing therefrom in a short period of time while reliably preventing a foreign matter from being mixed.SOLUTION: The shrink package comprises an inside film 16 of a shrink film 11 formed by winding an article 14 to be packed in one direction and an outside film 22 made from another shrink film 21, which is wound by crossing an outside of the inside film 16 to the inside film 16. The inside film 16 and the outside film 22 are heat-shrunk, and closely attached to the article 14 to be packed. The inside film 16 has an inside film perforation 20 for opening. The outside film 22 has an outside film perforation 24 for opening. The inside film perforation 20 and the outside film perforation 24 are provided at a non-overlapping position.SELECTED DRAWING: Figure 1

Description

The present invention relates to a shrink wrapping body in which a plurality of objects to be packaged are wrapped with a shrink film.

Conventionally, unfilled aerosol cans are packed in cardboard boxes and shipped from can makers. However, there is a problem that corrugated cardboard powder is mixed into the can during transportation, and improvement is required. There is a shrink wrapping with a plastic film as a wrapping that prevents the mixing of paper dust and also collects and binds a plurality of cans. However, if the plastic film is torn and removed during the filling process of the contents, a force is applied to the can and the can falls apart, resulting in poor work efficiency in the filling process.

As a solution to this problem, for example, there is a shrink package disclosed in Patent Document 1. In this shrink package, the upper surface and the lower surface are covered with two base film, and the two base films are welded by a heat-sealing portion that goes around the side surface, and the two base films are heat-shrinked and adhered to the contents. On the pair of side surfaces parallel to each other, a first easy opening line substantially parallel to the upper surface portion is provided at a position close to the upper surface portion. On the upper surface, a second easy-opening line is provided so as to substantially cross the center and both ends thereof are continuous in the vicinity of the center in the longitudinal direction of each first easy-opening line. The first easy opening line and the second easy opening line are configured as perforations. When opening, cut the second easy opening line and cut the upper surface in half. Then, by pulling the cut end portion of the upper surface portion to both sides, each first easy opening line is cut and opened in a double-opened shape. At this time, the area to be opened is small, and the cans do not scatter. Place it on a conveyor belt with the open top side down and pull up the film to remove it. The cans placed on the belt conveyor are self-supporting. Then, it is sent to the process of filling the contents by a belt conveyor.

Japanese Unexamined Patent Publication No. 2015-217954

In the case of the above background technique, since the first easy opening line and the second easy opening line are configured as perforations, there is a possibility that fine dust and moisture may enter from the perforations. Further, when the upper surface portion is open, the four side surfaces and the lower surface portion cover the five surfaces of the can, so that a force is easily applied when the film is removed, and the packaged can may fall down. Further, when placing the can on the belt conveyor, it is necessary to turn it upside down so that the open upper surface portion is on the bottom, and even at this time, a force is easily applied and the can may come off and be scattered.

The present invention has been made in view of the above-mentioned problems of the background technology, and provides a shrink wrapping body which can surely prevent foreign matter from being mixed in and can be manually and efficiently removed from the wrapping in a short time. With the goal.

The present invention is provided with an inner film formed by winding an object to be packaged in one direction with a shrink film and an outer film formed by intersecting the outer side of the inner film with the inner film and winding the inner film with the shrink film. The inner film and the outer film are heat-shrinked and are shrink packages that are in close contact with the object to be packaged.

The inner film is provided with an inner film perforation for opening, the outer film is provided with an outer film perforation for opening, and the inner film perforation and the outer film perforation are positioned so as not to overlap each other. It is provided.

The object to be packaged is an empty can, and the shrink package is a package of a plurality of the empty cans arranged in parallel with each other in the insertion direction. The inner film is wound around a direction substantially perpendicular to the insertion direction of the empty can, and the width intersecting the winding directions is substantially equal to the height of the empty can, that is, the length in the insertion direction. The outer film is wound around a pair of end faces that intersect with respect to the insertion direction of the empty can, and the width intersecting the winding directions is slightly longer than the end faces, and both sides of the end faces. The tubular portion that protrudes laterally due to heat shrinkage is bent along the side edge of the end surface and comes into close contact with a part of the side surface of the empty can.

The inner film perforations are formed by a pair of straight lines that intersect and cross the inner film in the longitudinal direction, and the portion between the pair of inner film perforations is a band-shaped cutout portion. Similarly, the outer film perforations are formed by a pair of straight lines intersecting and crossing the outer film in the longitudinal direction, and the portion between the pair of outer film perforations is a band-shaped cutout portion.

The shrink film is a vertical uniaxial shrink film.

The inner film perforations of the inner film and the outer film perforations of the outer film are provided at positions that do not coincide with each other.

The shrink wrapping body of the present invention can surely prevent foreign matter from entering, and can manually and efficiently remove the wrapping in a short time. Even if the outer film is removed, the inner film is wound around the object to be packaged, so that the objects to be packaged do not fall apart even when there are a plurality of objects to be packaged. The inner film is strip-shaped and can be easily opened from the perforation of the film for opening, can be removed without applying force to the packaged object, and can be taken out with a plurality of packaged objects lined up. can. The position of the film perforation for opening is provided in the range where the shrink film is double-wound so as not to coincide with each other, and is closed by the other overlapping shrink film, so that foreign matter can be removed from the film perforation. It does not get mixed.

It is a perspective view (a) of the shrink package of one embodiment of the present invention, a perspective view (b) seen from the side opposite to (a), and a perspective view (c) showing a state in which the outer film is removed. .. It is a perspective view which shows the packing method of the shrink wrapping body of this embodiment. It is a perspective view which shows the opening method of the shrink wrapping body of this embodiment. It is a top view which shows the operation of the wrapping apparatus which attaches the inner film of the shrink wrapping body of this embodiment. It is a top view which shows the operation of the wrapping apparatus which attaches the inner film of the shrink wrapping body of this embodiment. It is a top view which shows the operation of the wrapping apparatus which attaches the inner film of the shrink wrapping body of this embodiment. It is a front view which shows the operation of the wrapping apparatus which attaches the outer film of the shrink wrapping body of this embodiment. It is a front view which shows the operation of the wrapping apparatus which attaches the outer film of the shrink wrapping body of this embodiment. It is a front view which shows the operation of the wrapping apparatus which attaches the outer film of the shrink wrapping body of this embodiment. It is a front view which shows the operation of the wrapping apparatus which attaches the outer film of the shrink wrapping body of this embodiment. It is a front view which shows the operation of the wrapping apparatus which attaches the outer film of the shrink wrapping body of this embodiment. It is a front view which shows the process of heating by the heating apparatus of the shrink package of this embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of the present invention. The shrink wrapping body 10 of this embodiment is for accumulating and bundling a plurality of objects to be packaged by shrink films 11 and 21 described later, and wraps the product. The object to be packaged here is a metal aerosol can, which is an assembly of unfilled empty cans 12. The shrink wrapping body 10 wraps an empty can assembly 14 formed by arranging a plurality of empty cans 12 in parallel with each other in the insertion directions of the cylinders. As shown in FIG. 1, the empty can assembly 14 is a total of 20 empty cans 12 arranged in 4 rows of 5 each, and the upper surfaces 12a and the lower surfaces 12b, which are the end faces of the empty cans 12, are arranged. Are flush with each other and arranged in a single layer to form a rectangular parallelepiped shape. The upper surface 12a or the lower surface 12b of the empty can 12 is open.

In the empty can assembly 14, the upper surface 12a side of the empty can 12 is the upper surface 14a, and the lower surface 12b side of the empty can 12 is the lower surface 14b. The upper surface 14a and the lower surface 14b are rectangular shapes that are long in one direction, and a pair of long side surfaces 14c and 14d that are continuous on the long side and a pair of short side surfaces 14e that are continuous on the short side are provided between the upper surface 14a and the lower surface 14b. Has been done. That is, in the direction in which the upper surface 14a intersects in the longitudinal direction, the upper surface 14a, the long side surface 14c, the lower surface 14b, and the long side surface 14d are connected in this order. In the longitudinal direction of the upper surface 14a, the upper surface 14a, the short side surface 14e, the lower surface 14b, and the short side surface 14e are connected in this order. 1 (a) is a perspective view of the long side surface 14d on the left and the short side surface 14e on the right, and FIGS. 1 (b) and 1 (c) show the long side surface 14c on the left and the short side surface 14e on the right. It is a perspective view which looked at the side surface 14e.

As shown in FIG. 1C, the shrink package 10 is provided with an inner film 16 that winds around the long side surface 14c, the short side surface 14e, the long side surface 14d, and the short side surface 14e of the empty can assembly 14. ing. The inner film 16 is formed of a strip-shaped shrink film 11, and the shrink film 11 is a vertical uniaxial shrink film that shrinks heat in the winding direction. That is, the inner film 16 is wound and banded in a direction substantially perpendicular to the insertion direction of the empty can 12, and is brought into close contact with the empty can 12 by heat shrinkage to bundle the empty can 12. The width of the inner film 16 intersecting the winding direction is approximately equal to the height of the empty can assembly 14, that is, the length between the upper surface 14a and the lower surface 14b. The inner film 16 is provided with heat seal portions 18 that intersect in the winding direction at positions that abut on the centers of the long side surface 14c and the long side surface 14d. Inner film perforations 20 for opening are provided along the heat-sealing portion 18 on both sides of the to-seal portion 18 that abuts on the long side surface 14c, and penetrate in the width direction. The portion between the pair of inner film perforations 20 becomes a strip-shaped cutout portion 23.

As shown in FIGS. 1 (a) and 1 (b), the upper surface 14a, the long side surface 14c, the lower surface 14b, and the long side surface 14d of the empty can assembly 14 are wound around the outside of the inner film 16. An outer film 22 is provided. Like the inner film 16, the outer film 22 is formed of a strip-shaped shrink film 21, and the shrink film 21 is a vertical uniaxial shrink film that shrinks heat in the winding direction. That is, the outer film 22 is wrapped in a winding sleeve so as to cover the upper surface 12a and the lower surface 12b that intersect in the insertion direction of the empty can 12, and is brought into close contact with each other by heat shrinkage, and the empty can 12 is bundled so as not to shift in the vertical direction. .. The width of the outer film 22 intersecting the winding direction is slightly longer than the longitudinal direction of the upper surface 14a of the empty can assembly 14, and protrudes in a cylindrical shape on both sides of the upper surface 14a in the longitudinal direction. The cylindrical portions protruding from both sides of the upper surface 14a in the longitudinal direction are heat-shrinked by a heating step described later, are bent along the four sides of the short side surface 14e, and are brought into close contact with the peripheral edge portion of the short side surface 14e. The center of the short side surface 14e is not covered with the outer film 22, and an opening 22a is formed. The outer film 22 is provided with outer film perforations 24 for opening that intersect in the winding direction at positions that abut on the long side surface 14d, and two outer film perforations 24 are provided in parallel with each other in the width direction. It penetrates. The portion between the pair of outer film perforations 24 becomes a strip-shaped cutout portion 25.

Both the inner film 16 and the outer film 22 are heat-shrinked and are in close contact with the empty can assembly 14. Since the empty can assembly 14 is banded with the inner film 16 and wrapped with the outer film 22 and wrapped in a sleeve, the entire circumference is wrapped. An opening 22a not covered with the outer film 22 is formed in the central portion of the short side surface 14e, but since the inner film 16 is located in the opening 22a, the empty can 12 is not exposed. No foreign matter can enter. Since the inner film perforations 20 and the outer film perforations 24 are provided at different positions from each other, they are closed by the inner film 16 or the outer film 22 to prevent foreign matter from entering.

Next, the packaging method will be described with reference to FIG. Twenty or five empty cans 12 to be packaged are arranged in four rows to form a rectangular parallelepiped empty can assembly 14. The long side surface 14c, the short side surface 14e, the long side surface 14d, and the short side surface 14e of the empty can assembly 14 are wound around the shrink film 11 which is a vertical uniaxial shrink film, and the inner film 16 is attached. The packaging device 26 shown in FIGS. 4 to 6 is used for attaching the shrink film 11.

Here, the packaging device 26 will be described. 4 to 6 are top views of the empty can assembly 14 as viewed from the upper surface 14a side. The packaging device 26 is provided with a supply conveyor 28 for carrying the empty can assembly 14, and a film cutting portion 30 for cutting the shrink film 11 to a predetermined length is provided on the downstream side of the supply conveyor 28. .. The film cutting portion 30 is composed of two members located on both left and right sides intersecting the flow direction of the supply conveyor 28, and cuts by sandwiching the shrink film 11 between the two members. The two members are composed of elongated members that cross the shrink film 11, one of which has a built-in heat ray that heat-melts the shrink film 11, and the other that sandwiches the shrink film 11 and brings it into contact with the heat ray. Film rollers 32 are provided on both sides of the supply conveyor 28. The film roller 32 has a substantially right angle in the axial direction with respect to the conveyor surface of the supply conveyor 28, and the film raw fabric 34 of the shrink film 11 is provided in the vicinity of the film roller 32. The shrink film 11 drawn from the original film 34 is guided by a film roller 32 and is supplied in a width direction substantially perpendicular to the conveyor surface of the supply conveyor 28.

Next, the operation of the packaging device 26 will be described. First, as shown in FIG. 4, 20 empty cans 12 are integrated on the supply conveyor 28 to form an empty can assembly 14. At this time, the upper surface 14a of the empty can assembly 14 is directed upward, and the long side surface 14c is directed downstream. At this time, the shrink film 11 drawn from the pair of left and right film raw fabrics 34 is guided by the film rollers 32 and supplied in the width direction substantially perpendicular to the conveyor surface of the supply conveyor 28. The tips of the shrink films 11 are heat-welded by the film cutting portion 30 and connected by the heat sealing portion 18, and cross the downstream side of the supply conveyor 28.

Next, the empty can assembly 14 is placed on the supply conveyor 28 and moves, and while pushing the shrink film 11, it passes between the pair of film cutting portions 30. Then, the heat-sealed portion 18 of the shrink film 11 comes into contact with substantially the center of the long side surface 14c, and the pair of short side surfaces 14e are covered with the shrink film 11. Then, as shown in FIG. 5, the pair of film cut portions 30 move toward each other, come into contact with each other near the center of the long side surface 14d, and heat-weld with the shrink film 11 sandwiched between them to form the heat seal portion 18. It becomes tubular and the inner film 16 is formed. At this time, inner film perforations 20 are formed on both sides of the heat seal portion 18 on the empty can assembly 14 side.

The inner film perforations 20 may be formed on both sides of the heat-sealed portion 18 of the welded shrink film 11 on the side separated from the empty can assembly 14. In this case, the inner film perforation 20 is located on the front side of the empty can assembly 14 in the feeding direction.

As shown in FIG. 6, the empty can assembly 14 is sent downstream by a discharge conveyor (not shown), the inner film 16 is separated from the shrink film 11, and the long side surface 14c, the short side surface 14e, the long side surface 14d, and the short side surface 14e are separated. The inner film 16 is completely attached by winding it around.

Next, the upper surface 14a, the long side surface 14c, the lower surface 14b, and the long side surface 14d are wound around the outer side of the inner film 16 with the film 21 which is a vertical uniaxial shrink film, and the outer film 22 is attached. The packaging device 36 shown in FIGS. 7 to 11 is used for attaching the outer film 22.

Here, the packaging device 36 will be described. 7 to 11 are front views of the empty can assembly 14 as viewed from the short side surface 14e. The packaging device 36 includes a supply conveyor 38 that carries an empty can assembly 14 to which the inner film 16 is attached, and an empty can assembly that is continuous on the downstream side of the supply conveyor 38 and has an outer film 22 attached to the outside of the inner film 16. Discharge conveyors 40 that carry out 14 are provided side by side. A gap 42 is provided between the supply conveyor 38 and the discharge conveyor 40.

A movable roller 46 on which a conveyor belt 44 is hung is provided at the downstream end of the supply conveyor 38. A movable roller 50 on which a conveyor belt 48 is hung is provided at the upstream end of the discharge conveyor 40.

A film cutting portion 52 for cutting the shrink film 21 to a predetermined length is provided in the gap 42 between the supply conveyor 38 and the discharge conveyor 40. The film cutting portion 52 is composed of a lower member 52a located below and an upper member 52b located above, and cuts by sandwiching the shrink film 21 between the lower member 52a and the upper member 52b. The lower member 52a and the upper member 52b are made of elongated members that intersect the flow direction of the supply conveyor 38, and have a length that crosses the shrink film 21. The lower member 52a contains a nichrome wire, which is a heat wire that heat-melts the shrink film 21, and is located inside the gap 42 and below the conveyor belt 44 of the supply conveyor 38. The upper member 52b abuts on the lower member 52a to bring the nichrome wire into contact with the shrink film 21, is located above the gap 42, and is moved toward the lower member 52a by the cylinder 53.

A film roller 54 is provided above the supply conveyor 38. The film rollers 54 are parallel to the surface of the conveyor belt 44 of the supply conveyor 38 in the axial direction and intersect in the flow direction. The film raw fabric 56 of the shrink film 21 is provided in the vicinity of the film roller 54, and the shrink film 21 pulled out from the film raw fabric 56 is guided by the film roller 54 and is guided by the conveyor belt 44 of the supply conveyor 38. It is supplied so that the width direction is parallel to the surface and the flow direction intersects.

Next, the operation of the packaging device 36 will be described. First, as shown in FIG. 7, an empty can assembly 14 to which the inner film 16 is attached is placed on the supply conveyor 38. At this time, the upper surface 14a of the empty can assembly 14 is directed upward, and the long side surface 14c is directed downstream. At this time, the shrink film 21 drawn out from the original film 56 is guided by the film roller 54 and supplied from above substantially parallel to the conveyor surface of the supply conveyor 38 in the width direction, and is supplied from above at the end of the shrink film 21. 21a hangs down in the gap 42 between the supply conveyor 38 and the discharge conveyor 40.

After that, the empty can assembly 14 is placed on the conveyor belt 44 of the supply conveyor 38 and moves, and moves toward the discharge conveyor 40 while pushing the shrink film 21. When the empty can assembly 14 is located near the movable roller 46 of the supply conveyor 38, the movable roller 46 moves so as to project toward the gap 42, and the gap 42 is temporarily narrowed.

Next, as shown in FIG. 8, when the empty can assembly 14 smoothly moves to the discharge conveyor 40 beyond the gap 42, it is between the conveyor belt 48 of the discharge conveyor 40 and the lower surface 14b of the empty can assembly 14. The end portion 21a of the shrink film 21 is sandwiched between the two. The upper member 52b of the film cut portion 52 is moved downward by the cylinder 53, and the side of the shrink film 21 opposite to the end portion 21a is folded back so as to cover the upper surface 14a and the long side surface 14d of the empty can assembly 14. It is pushed down by the member 52b, hangs down in the gap 42, is sandwiched between the lower member 52a and the upper member 52b of the film cut portion 52 below the discharge conveyor 40 conveyor belt 48 as shown in FIG. 9, and is a shrink film. 21 is cut to form the end 21b. As a result, the shrink film 21 has a length suitable for packaging the empty can assembly 14.

After the shrink film 21 is cut, the upper member 52b of the film cut portion 52 is raised to the original position by the cylinder 53 as shown in FIG. Then, the movable roller 50 of the discharge conveyor 40 moves to the side opposite to the gap 42, and the movable roller 50 moves to a position close to the center side of the lower surface 14b of the empty can assembly 14. As a result, the lower surface 14b on the gap 42 side of the empty can assembly 14 is exposed, a space 58 is formed below, and the end portion 21a of the shrink film 21 hangs down from the movable roller 50 into this space 58. The other end 21b of the shrink film 21 hangs down from the long side surface 14d of the empty can assembly 14.

Then, the movable roller 46 of the supply conveyor 38 moves into the space 58 and protrudes. The movable roller 46 reaches the vicinity of the movable roller 50 of the discharge conveyor 40 at a position close to the center side of the lower surface 14b of the empty can assembly 14, and the end portion 21b of the shrink film 21 is between the lower surface 14b of the empty can assembly 14. It is sandwiched between the two, bent at the lower end of the long side surface 14d, and overlapped with the bottom surface 14b. The outer film perforation 24 is located at a position where it abuts on the long side surface 14d.

After that, as shown in FIG. 11, when the empty can assembly 14 is conveyed by the discharge conveyor 40 and the end portion 21a of the shrink film 21 hanging downward from the movable roller 50 passes through the movable roller 50, It is overlapped on the outside of the end portion 21b that was previously overlapped on the lower surface 14b of the empty can assembly 14, and the circumference of the empty can assembly 14 is wound around the shrink film 21 in the vertical direction. As a result, the upper surface 14a, the long side surface 14c, the lower surface 14b, and the long side surface 14d are wound around the outer side of the inner film 16 around the shrink film 21, and the attachment of the outer film 22 is completed.

Then, as shown in FIG. 12, the shrink films 11 and 21 are heat-shrinked by being placed in the heating device 60 and heated, and the shrink films 11 and 21 are brought into close contact with the empty can assembly 14 and packaged. The method of heat shrinkage may be hot air or a hot roller. In addition to the method of heat-shrinking the shrink films 11 and 21, the shrink films 11 and 21 may be attached by various means such as an adhesive.

Next, in a filling factory where the empty can 12 is filled with the contents, an opening method for taking out the empty can 12 from the shrink package 10 will be described with reference to FIG. First, the empty can assembly 14 packaged in the shrink package 10 is placed on a conveyor belt or the like of a belt conveyor (not shown) in the filling process. Then, the cut portion 25 between the pair of outer film perforations 24 is caused from the end portion of the outer film 22 located on the short side surface 14e, and the outer film perforations 24 are cut and cut continuously on the long side surface 14d. Part 25 is removed. The outer film 22 is separated from the portion covering the long side surface 14d, and is opened and removed. Even if the outer film 22 is removed, the inner film 16 is wound around the empty can assembly 14 and is in close contact with the empty cans 12, so that the empty cans 12 do not fall or separate and do not fall apart.

Further, the empty can assembly 14 wrapped with the inner film 16 is placed on a predetermined conveyor belt or the like, and the cut portion 23 between the pair of inner film perforations 20 is raised from the end portion of the inner film 16 to cause the inner side. The film perforation 20 is cut, and the cutout portion 23 is removed. The inner film 16 is separated from the portion covering the long side surface 14c, and is opened and removed. As a result, the shrink package 10 can be completely removed, and 20 empty cans 12 can be independently supplied with the upper surface 12a or the lower surface 12b facing up in a state where 20 empty cans 12 are lined up on a conveyor belt or the like.

According to the shrink package 10 of this embodiment, the package can be manually and efficiently removed in a short time, foreign matter is prevented from adhering during transportation and storage, and quality control is easy. Even if the outer film 22 is removed, the inner film 16 is wound around the empty can assembly 14, so that the empty cans 12 do not fall apart. The inner film 16 and the outer film 22 can be easily separated and removed by raising the cutout portions 23 and 25 and removing the inner film perforations 20 or the outer film perforations 24 while cutting them. The inner film 16 does not cover the upper surface 14a and the lower surface 14b, and can be easily removed by simply cutting the cutout portion 23, and a strong force is applied to the empty can 12 so that the alignment is not disturbed. Can be taken out in an orderly and independent state, and can be sent to the filling process in an orderly and independent state, resulting in good work efficiency.

Further, since the shrink films 11 and 21 are double-wound, the strength is high. Moreover, the positions of the outer film perforations 24 and the inner film perforations 20 are provided in a range in which the shrink films 11 and 21 are doubly wound, and are closed by the other overlapped shrink films 11 and 21. Therefore, foreign matter does not enter from the outer film perforation 24 and the inner film perforation 20. Further, an opening 22a not covered with the outer film 22 is formed in the central portion of the short side surface 14e, but since the inner film 16 is exposed and closed in the opening 22a, foreign matter is also formed from this portion. Will not invade. The inner film 16 and the outer film 22 are vertical uniaxial shrink films, and shrink in the winding direction to securely bundle the empty cans 12, and the widths intersecting in the winding direction do not shrink, resulting in gaps and the like. Does not occur.

In addition, the shrink wrapping body 10 can be removed by placing the empty can 12 on the belt conveyor of the filling factory with the upper surface 12a or the lower surface 12b facing upward, and the desired surface can be self-supporting upward. There is no need to turn the empty can 12 upside down. The shrink wrapping body 10 can be packaged by using the wrapping device 26 and the wrapping device 36, which is efficient. In the wrapping device 36, the ends 21a and 21b of the shrink film 21 can be automatically overlapped with each other, and can be neatly wrapped.

The shrink wrapping body of the present invention can be used for various objects to be packaged, and is suitable for packaging objects to be packaged in a shape that easily falls over. The number of objects to be packaged can be changed as appropriate, and the upper surface and the lower surface may be reversed. The packaging device to which the inner film or the outer film is attached is not limited to the above embodiment, and the number and arrangement of each conveyor roller and film roller can be freely changed. The structure of the film cut portion may be other than the above, as long as the film is surely pushed down and cut to an arbitrary length and supplied. The method of overlapping the edges of the outer films may be other than the above, and may be connected by a heat seal portion like the inner film. stomach. The position, shape, and number of outer film perforations and inner film perforations can be changed as appropriate, as long as they do not match each other. You may. The material of the film used is free, and may be other than the vertical uniaxial shrink film.

10 Shrink packaging 11,21 Shrink film 12 Empty can 14 Empty can assembly 16 Inner film 20 Inner film perforation 22 Outer film 24 Outer film perforation 23,25 Cutout

Claims (6)

An inner film formed by winding an object to be packaged in one direction with a shrink film and an outer film formed by intersecting the outer side of the inner film with the inner film and winding the inner film with the shrink film are provided. A shrink wrapping body in which the outer film is heat-shrinked and adheres to the object to be packaged. The inner film is provided with an inner film perforation for opening, the outer film is provided with an outer film perforation for opening, and the inner film perforation and the outer film perforation are positioned so as not to overlap each other. The shrink wrapping body according to claim 1 provided. The object to be packaged is an empty can, and the shrink package is a package of a plurality of the empty cans arranged in parallel with each other in the insertion direction.
The inner film is wound around a direction substantially perpendicular to the insertion direction of the empty can, and the width intersecting the winding directions is substantially equal to the height of the empty can, that is, the length in the insertion direction.
The outer film is wound around a pair of end faces intersecting with respect to the insertion direction of the empty can, and the width intersecting the winding directions is slightly longer than the end faces, and both sides of the end faces. The shrink according to claim 1, wherein the cylindrical portion that protrudes into a cylindrical shape and protrudes laterally due to heat shrinkage is bent along the side edge portion of the end surface and adheres to a part of the side surface of the empty can. Packaging body. The shrink package according to claim 1, wherein the shrink film is a vertical uniaxial shrink film. The inner film perforation is formed by a pair of straight lines intersecting and crossing the longitudinal direction of the inner film, and a portion between the pair of inner film perforations becomes a band-shaped cutout portion, and the outer film perforation is formed. The shrink wrapping body according to claim 2, wherein the shrink wrapping body is formed by a pair of straight lines intersecting and crossing the outer film in the longitudinal direction, and a portion between the pair of outer film perforations is a strip-shaped cutout portion. The shrink package according to claim 2, wherein the inner film perforation of the inner film and the outer film perforation of the outer film are provided at positions that do not coincide with each other.

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