JP2003292030A - Shrink package and shrink packaging device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shrink package and a shrink packaging device, which prevent tearing of a perforation even in shrink packaging under a high tension. <P>SOLUTION: The shrink packaging body comprises an article to be packaged and shrink packaging for packaging the article in a close contact state. The shrink package is characterized in that an unsealing part, which can be more easily opened and torn than other parts of the shrink packaging at unsealing, is formed in a part of the outer periphery of the shrink packaging. The shrink packaging device is used for the manufacture of the shrink package. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shrink wrapping body and a shrink wrapping device, and more particularly, in a shrink wrapping body provided with perforations, when shrink wrapping is performed under the condition that the shrink film shrinks with high tension. Also relates to a shrink wrapping body in which the perforation is not broken, and a shrink wrapping device capable of obtaining the shrink wrapping body.

[0002]

2. Description of the Related Art In recent years, photographic films are often sold in a form in which two to five films are stored in one paper box. The paper box is often packed with shrink film in a state of collecting 4 to 5 pieces.

In the shrink wrapping body in which the paper boxes are collectively packaged, perforations have not been formed in the related art. Therefore, it is necessary to make a cut in the shrink film with a cutter knife or scissors when opening.

Therefore, in recent years, it has been considered to provide perforations in the shrink package so that it can be easily opened without using a tool such as a cutter knife or scissors.

FIG. 17 shows an example of the shrink package.

The shrink wrapping body P shown in FIG. 17 is a set of five rectangular parallelepiped paper boxes A in each of which a cylindrical moisture-proof case in which a photographic film cartridge is accommodated is arranged along the short side direction. This is a packaging body in which the body is wrapped with a shrink film B, and has a rectangular plate-like form with the long side of the paper box A as the short side as a whole. A perforation p that facilitates opening is provided at the center of the shrink wrapping body P in the width direction.
Are provided along the longitudinal direction.

As a shrink wrapping device for shrink wrapping the aggregate of the paper boxes A, there is a shrink wrapping device S shown in FIG.

As shown in FIG. 18, the shrink wrapping device S supports an original fabric roll a around which an original fabric of a shrink film folded in two along the longitudinal direction is wound, and supports the original fabric roll a from below. A pair of film-placing rollers b, a pair of right-angled triangular plate-shaped triangular formers c for changing the transport direction of the shrink film s unwound and transported from the original roll a toward the paper surface by 90 °, and a shrink. A perforation blade d1 and a perforation blade receiving roller d2 which are located on the upstream side of the triangular former c with respect to the film transport direction and which are provided with perforations on the shrink film s, and the perforation blade d1 and the perforation blade receiving roller d2. Is also located on the upstream side, and a film perforation roller e for perforating an air vent hole in the shrink film s so that the inside air escapes when shrinking. It has. A tension roller g2 and a nip roller g1 which apply tension to the shrink film s and convey it in the direction of the arrow at the same time are provided between the film perforating roller e and the original roll a. In FIG. 18, f and h indicate pass rollers.

The aggregate of the paper box A is loaded between the triangle formers c, and is conveyed by the shrink film s in the longitudinal direction together with the shrink film s as shown in FIGS. 19 (A) and (B). It is sandwiched from above and below. Then, as shown in (C), the shrink film s is sealed on three sides, and the aggregate of the paper box A is wrapped in the bag-shaped shrink film s.

In this state, when the aggregate of the paper box A is maintained at the shrinkage temperature of the shrink film s or higher, the shrink package P shown in FIG. 17 is obtained.

[0011]

Shrink wrapping device S
In FIG. 19, since the perforations p are punched in the shrink film s in the state of being folded in two, as shown in FIG. 19 (B), not only the portion of the shrink film s located above the paper box A but also below The perforation p is also given to the portion positioned at, and as a result, as shown in FIG. 17, in the shrink wrapping body P, the perforation p is provided so as to make one turn in the longitudinal direction of the shrink wrapping body P. .

However, in the shrink package P, when the shrink film s is heat-shrinked after the three-way sealing, the perforation on the lower side of the paper box A sometimes breaks.

In particular, when the paper box A is provided with the header A2 as shown in FIG.
In the figure, as shown in (B), the headers A2 are folded toward the paper box body A4 and a predetermined number of them are collected along the width direction. Then, as shown in (C), the shrink film s is formed.
Since the shrink wrapping is performed with the shrink wrapping, the three-way sealing and the heat shrinkage need to be performed in the shrink wrapping P under the condition that a strong tension is applied to the shrink film s.

However, if the three-way sealing and the heat shrinkage are performed under the above conditions, there is a problem that the perforation p is more likely to be broken.

According to the present invention, in a shrink wrap provided with perforations, the shrink wrap does not break even when the shrink wrapping is performed under the condition that the shrink film shrinks with high tension, and An object of the present invention is to provide a shrink wrapping device that can easily manufacture the shrink wrapping body.

[0016]

According to a first aspect of the present invention, there is provided a shrink package comprising an article to be packaged and a shrink wrap that wraps the article to be packaged in a close contact state. The shrink wrapping body is characterized in that an opening portion that can be easily torn apart from the other parts of the shrink wrapping is formed along a part of the outer periphery of the shrink wrapping.

In the shrink package, since the opening portion is not provided on the entire circumference of the circumference of the article to be packaged, the opening portion is split when heat-shrinkable to form a shrink package. There is nothing to do.

Further, since the shrink film forming the shrink wrap is easily torn from the tear once the tear is formed, the shrink wrap is formed by opening the opening portion of the shrink wrap to form the shrink wrap. Can be opened easily.

Further, since the opening portion can be easily opened by hand, it is not necessary to use a tool such as scissors or a knife to open the shrink wrap.

Examples of the articles to be packaged include a box-shaped paper box for storing a photographic film in a moisture-proof case, and a paper box assembly formed by arranging a plurality of the paper boxes in a flat rectangular parallelepiped shape. Can be mentioned,
The article is not limited to the paper box or the paper box assembly as long as it can be wrapped with a shrink film.

The shrink wrapping includes, for example, sandwiching the article to be wrapped between two folded shrink films,
It can be formed by performing a three-way seal for sealing the three sides along the outer periphery of the article to be packaged. Alternatively, the article to be packaged may be sandwiched between two shrink films, and four-way sealing may be performed to seal four sides along the outer periphery of the article to be packaged.

The shrink film includes, for example, a polyethylene biaxially stretched film obtained by biaxially stretching a polyethylene film. In addition, a biaxially stretched film of various polyolefins such as ethylene / propylene copolymer, a PET biaxially stretched film. , Nylon (R) biaxially stretched film and the like.

At the time of opening, the unsealing part can be easily torn by applying a force to both sides of the unsealing part in the shrink wrap in a direction of opening the unsealing part. After the packaged article is wrapped and shrink-heated to form a shrink wrap, it is formed so as not to be split. The cleavage portion is usually formed in a linear shape. Examples of the unsealed portion include perforations, which will be described later, and thin-walled portions which are linear areas in which the thickness of the film is thinner than the surrounding area.

According to a second aspect of the present invention, the article to be packaged has a flat shape, and the shrink wrapping has the opening portion formed only on a portion in contact with one surface of the article to be packaged. The shrink wrapping body according to claim 1.

When the article to be packaged has a flat shape, a particularly strong force acts on the unsealing portion at the time of heating and shrinking, so that perforations and the like are formed over the entire circumference of the article to be packaged. When the unsealed portion is formed, the portion located below the unsealed portion is likely to be broken.

However, since the shrink wrapping body has the advantage that it can be heated and shrunk by gripping it so that the part without the opening is located on the lower side, the shrink wrapping will shrink even if it is heated and shrunk under severe conditions. There are no tears in the packaging.

In addition to the features of the shrink wrapping body according to claim 1, the shrink wrapping has a particularly large opening portion, so that a large tear is formed in the shrink wrapping by manually tearing the opening wrapping portion. Since it is possible, it has an advantage of being easy to open.

The shrink wrapping body is formed by wrapping the article to be wrapped with a folded shrink film and sealing it on three sides, or by sandwiching the article to be wrapped between two pieces of shrink film and sealing it on four sides. An example of such a shrink wrapping body is one in which an opening portion is formed on the film on the side in contact with one surface of the article to be packaged.

The invention according to claim 3 relates to a shrink wrapping body, wherein the article to be packaged is an assembly formed by arranging a plurality of box-shaped bodies in one row or in two or more rows.

The shrink wrap is, for example, a paper box containing a predetermined number of photographic films in a moisture-proof case.
This is an example in which the present invention is applied to an aggregate having a rectangular parallelepiped shape as a whole, which is arranged in a matrix in two or more rows.

According to a fourth aspect of the present invention, there is provided a mount having an opening formed so that at least one of the box-shaped bodies can be seen when the aggregate is placed on one surface of the mount. The present invention relates to a shrink wrap that is shrink-wrapped while the aggregate is placed on the mount.

Conventionally, in order to make the box-like bodies constituting the aggregate visible from the outside, a mount provided with a notch has been used, so that the shrink film is kept under the condition that a large tension remains in the shrink film. When packaged, the notch portion of the mount may be bent or deformed due to the tension.

On the other hand, since the mount does not have a notch that causes a reduction in strength, even when shrink-wrapped under the above conditions, the mount will not be deformed due to the shrinkage stress. In many cases, a bar code is drawn or an expiration date is printed on the surface of the box-shaped body forming the aggregate, which is the side in contact with the mount, that is, the rear surface. Therefore, if a shrink film package having the above-mentioned packaging form is formed, it is possible to optically read the barcode or the expiration date printed on the box-like body through the opening without breaking the shrink package. it can.

The invention according to claim 5 relates to a shrink package in which the opening portion is a perforation.

Since the perforations can be easily formed and can be easily torn by hand when opening, the shrink wrapping body can be easily manufactured and can be easily opened.

According to a sixth aspect of the present invention, there is provided a shrink film supplying means for supplying a shrink film, and a packaged article covering means for covering both sides of the packaged article with the shrink film supplied from the shrink film supplying means. An unsealing portion forming means for forming an unsealing portion in a portion of the shrink film supplied to the wrapping article covering means in contact with one surface of the wrapping article, and the wrapping article is covered by the wrapping article covering means. Sealing means for sealing a shrink film along the outer periphery of the article to be packaged to form a package, and heating the package formed by the sealing means to shrink the shrink film to form a shrink package. And a shrink wrapping device.

According to the shrink wrapping device, the shrink wrapping body according to any one of claims 1 to 5 can be easily manufactured.

The shrink film, the article to be packaged, and the opening section are as described in claim 1.

Examples of the shrink film supply means include a double-folded film supply unit, which will be described later, and a double film supply device for supplying two shrink films while maintaining a positional relationship so as to face each other.

Examples of the unsealing portion forming means include a perforation forming device for forming perforations in the shrink film, and a thin portion forming device for forming a linear thin portion.

As the packaged article coating means, a packaged article coating apparatus having a space forming portion and a packaged article charging section, which will be described later, as well as two shrink films supplied from the double film supply apparatus. An example is a packaged article covering device in which the packaged article is placed on one side and the other side of the shrink film covers the packaged article.

Between the shrink film supplied from the double film supply device and the three-way seal device applied when the article to be packaged is wrapped by the shrink film supplied from the double-fold supply part, as the sealing means. A four-way sealing device applied when the article to be packaged is sandwiched and packaged.

According to a seventh aspect of the present invention, the shrink film supply means has a double-folded film supply section for supplying the shrink film in a state of being folded in two in the longitudinal direction, and the article to be packaged is covered. The means includes a space forming portion that separates side edges of the shrink film supplied from the double-folded film supplying portion to form a space, and the space formed in the shrink film in the space forming portion into the package. A packaged article loading section for loading an article, wherein the unsealing section forming means opens the section between one of the side edges of the shrink film and a fold section formed by folding in two. The present invention relates to a shrink wrapping device that includes an unsealing portion forming portion that forms a portion.

In the shrink wrapping device, the sealing means may seal the surrounding three sides of the article to be packed, so that the shrink wrapping body can be efficiently manufactured.

Examples of the unsealed portion forming portion include the perforation forming device and the thin portion forming device described in the sixth aspect.

According to an eighth aspect of the present invention, the space forming portion is wound around the shrink film in the two-fold state supplied from the two-fold film supply portion, and the side edges of the shrink film are separated from each other. To form a space, and at the same time, the shrink film is conveyed in the direction 90.
The present invention relates to a shrink wrapping device provided with a triangle former formed of a pair of triangular plate members that are converted.

In the shrink wrapping device, the articles to be packaged are loaded from between the triangular formers, and the articles to be packaged are conveyed along the conveying direction of the shrink film, so that the articles to be wrapped are wrapped with the shrink film. The article charging section can be wrapped.

Therefore, the shrink wrapping device is
The configuration of the article-to-be-wrapped covering means can be particularly simplified.

[0049]

BEST MODE FOR CARRYING OUT THE INVENTION 1. Embodiment 1 An example of the shrink package according to the present invention is shown in FIG.

As shown in FIG. 1, the shrink wrapping body 10 is composed of five rectangular parallelepiped paper boxes 2A for accommodating a predetermined number of photographic film cartridges, for example, 2 to 5, and the side faces on the long sides thereof are adjacent to each other. The assembly 2 having a flat rectangular parallelepiped shape as a whole is shrink-wrapped with a shrink film 42. The paper box 2A corresponds to the box-shaped body in the shrink package of the present invention.

The assembly 2 is loaded into a space formed by separating the side edges of the folded shrink film 42 from each other. Then, the shrink film 42 is sealed on three sides along the outer periphery of the assembly 2 to form the seal portion 6. This corresponds to the upper shrink film 4A that covers the upper side of the assembly 2, the lower shrink film 4B that covers the lower side of the assembly 2, and the folds of the shrink film 42, and along the longitudinal direction of the assembly 2. A shrink wrap 4 having a fold portion 4C that covers one side surface is formed.

The perforations 8 are an example of the unsealing portion according to the present invention, and are provided only on the upper shrink film 4A along the longitudinal direction of the assembly 2, and the lower shrink film 4 is provided.
B is not provided. Therefore, even when shrink wrapping is performed under the condition that a large tension is applied to the shrink film 42, as in the case of shrink wrapping a paper box assembly provided with a header, the portion of the perforations 8 is not removed during heating and shrinking. It won't break. Further, by breaking the perforations 8, the shrink wrap 4 can be broken without using a tool such as a knife or scissors.

2. Embodiment 2 FIG. 2 shows another example of the shrink package according to the present invention.
2, the same reference numerals as those in FIG. 1 denote the same elements as those shown in FIG. 1 unless otherwise specified.

Shrink package 12 according to the second embodiment
5 is similar to the shrink wrap 10 according to the first embodiment.
This is a box-shaped aggregate 2 which is made up of individual paper boxes 2A, and is shrink-wrapped as a whole, and as shown in FIG. 2, perforations 8 are provided along the width direction of the aggregate 2.

Except for this point, the shrink package 12 is the same as the shrink package according to the first embodiment.

The shrink wrap 12 is similar to the shrink wrap according to the first embodiment in the shrink film 42.
Even when shrink-wrapped under conditions where a large amount of tension is applied, the perforations 8 will not break during heating and shrinking, and the perforations 8 can be broken to allow tools such as knives and scissors. The shrink wrap 4 can be broken without using.

3. Embodiment 3 FIG. 3 shows still another example of the shrink package according to the present invention. 3, the same reference numerals as those in FIG. 1 denote the same elements as those shown in FIG. 1 unless otherwise specified.

Shrink package 14 according to the third embodiment
3 is the same as the shrink package according to the first embodiment except that the perforations 8 are provided in a cross shape along the longitudinal direction and the width direction of the assembly 2 as shown in FIG.

The shrink wrap 14 has the same features as those of the shrink wraps according to the first and second embodiments, and more easily when the perforation 8 is broken, because a cross-shaped cut is formed in the shrink film 42. In addition, the shrink wrap 4 can be torn and opened.

4. Embodiment 4 FIG. 4 shows a top view of an example of a shrink package in which a paper box having a header is shrink-wrapped,
A view from below is shown in FIG. Unless otherwise noted
4 and 5, the same reference numerals as those in FIG. 1 denote the same elements as those shown in FIG.

Shrink package 16 according to the fourth embodiment
As shown in FIGS. 4 and 5, an assembly in which five paper boxes 20 shown in FIG. 6 in which bill-shaped headers 22 are provided along the long sides are arranged so that the side faces on the long side are adjacent to each other. 24 is placed on the upper surface of the mount 26, sandwiched by the shrink film 42 folded in two from the top and bottom, and heat-shrinked by three-way sealing. As shown in FIG. 7, the aggregate 24 is formed by placing the adjacent paper boxes 20 on the header 22 provided on the paper box 20. In addition, like the paper box 2A described in the first to third embodiments, the paper box 20 is a paper box in which a predetermined number of moisture-proof cases for storing the photographic film cartridges are stored.

The mount 26 is provided with an opening 28 so that the barcode printed on the paper box 20 and the printing of the expiration date can be read through the shrink film 42.

The seal portion 6 is a three-way seal portion provided along the outer periphery of the mount 26.

The upper shrink film 4A is the assembly 2
4 and the lower shrink film 4B covers the side of the mount 26 opposite to the side on which the aggregate 24 is placed.

The perforation 8 is provided along the longitudinal direction of the aggregate 24 in the widthwise central portion of the upper shrink film 4A, as in the shrink package according to the first embodiment.

In the shrink package 16 according to the fourth embodiment, the perforations 8 are formed by the upper shrink film 4A.
Since it is only provided on the perforation, the perforation portion does not break during heat shrinkage. Also, when opening the bag, perforation 8
By breaking, the shrink wrap 4 can be broken and the paper box 20 can be taken out without using a tool.

5. Embodiment 5 FIG. 8 shows another example of a shrink package in which a paper box having a header is shrink-wrapped.

Shrink package 18 according to the fifth embodiment
8 is a wrapping body obtained by shrink-wrapping a rectangular parallelepiped paper box 21 in which a bill-shaped header 23 is provided along a short side, as shown in FIG.

The structure of the paper box 21 shown in FIG. 8A is folded so that the header 23 is in contact with the paper box body 21 as shown in FIG. 5 pieces are arranged in the above to form an aggregate 25.

Then, as shown in (C) in the figure, the assembly 25 is sandwiched between the shrink films 42 folded in two from above and below, and the reel portion 6 is formed by three-side sealing to form a reel portion 6 and then heat shrinking, The shrink wrapping body 18 is obtained by forming the shrink wrap 4 having the shrink film 4A, the lower shrink film 4B, and the side edge portion 4C.

In the shrink wrapping body 18 according to the fifth embodiment, since the shrink wrapping is performed with the header 23 of the paper box 21 folded, a stronger tension is exerted on the shrink film than the shrink wrapping bodies according to the first to third embodiments. Three-way sealing and heat contraction are carried out under conditions such that they are applied. However, the perforation 8 is formed by the upper shrink film 4
Since it is provided only in A, the perforated portion does not break during heat shrinkage. Further, at the time of opening, by breaking the perforations 8, the shrink wrap 4 can be broken and the paper box 20 can be taken out without using a tool.

6. Embodiment 6 Regarding an example of the shrink wrapping device according to the present invention, the overall configuration is shown in FIG. 9, and the configuration of a double-folded film supply unit described later is shown in FIG. According to the shrink wrapping apparatus, the shrink wrapping body according to the first or fourth embodiment is manufactured.

As shown in FIG. 9, in the shrink wrapping apparatus 1000 according to the sixth embodiment, the double-folded film supply section 100 for supplying the shrink film 42 in the double-folded state.
And a side edge portion of the shrink film 42 in the two-fold state supplied from the half-fold film supply portion are separated from each other to open the shrink film 42 in a C shape to form a space, and at the same time, the space is formed in the first embodiment. The covering portion 200 in which the aggregate 2 described in 1 above is charged and covered with the shrink film 42 and the shrink film 42 in which the aggregate 2 is covered by the encapsulating portion 200 are three-way sealed along the outer periphery of the aggregate 2. The shrink film 300 that forms the package and the package sealed by the seal are heated to shrink film 42.
And a shrink tunnel 400 that shrinks to form the shrink package 10. The double-folded film supply unit 100, the covering unit 200, the sealing unit 300, and the shrink tunnel 400 respectively correspond to a shrink film supplying unit, a packaged article covering unit, a sealing unit, and a heat shrinking unit in the shrink packaging apparatus according to the present invention.

As shown in FIG. 9 and FIG. 10, the double-folded film supply section 100 includes a raw roll 1 around which a raw shrink film double-folded in the longitudinal direction is wound.
02, a pair of film placing rollers 104 supporting the original fabric roll 102 from below, and the shrink film 42 unwound in a folded state from the original fabric roll 102, while at the same time applying tension. The tension roller 106 and the nip roller 108 which convey the shrink film 42 along the arrow a, and the shrink film 42 which is located downstream of the tension roller 106 along the conveyance direction a so that the inner air escapes when heat shrinks. The film-punching roller 110 in which four piercing projections for forming holes are formed along the circumferential direction and the film-punching roller 110 located downstream of the film-punching roller 110 along the transport direction a, and covers the shrink film 42 with the covering portion 200. And pass rollers 112 and 114 that guide toward.

A tension is applied to the shrink film 42 between the tension roller 106 and the film placing roller 104, and the shrink film 42 is guided so that the winding angle of the shrink film 42 around the tension roller 106 becomes large. A pass roller 116 is provided.

As shown in FIGS. 9 and 10, the covering section 200 separates the side edges of the shrink film 42 in the folded state supplied from the folded film supply section 100 from each other and opens in a C-shape. A pair of right-angled triangular plate-shaped triangular formers 202 that form a space therebetween and simultaneously change the conveying direction a of the shrink film 42 in the horizontal plane by 90 °, and are adjacent to the upstream side of the triangular former 202 with respect to the conveying direction a. Then, a disc-shaped perforation blade 502 for imparting perforations to the upper shrink film of the shrink film 42 opened in the C-shape by the triangular former 202, and a conveying path of the perforation-provided shrink film. Arranged between the perforation blade receiving roller 504, which faces the perforation blade 502 with the pinch interposed, and the triangular former 202. Is, conveying direction a of the shrink film 42 in the triangular former 202 was converted 90 °
The product conveyor 204 which conveys the aggregate | assembly 2 along. The product conveyor 204 is omitted in FIG. 10. The triangular formers 202 are arranged vertically so as to sandwich the conveyance path of the shrink film 42. Below, the triangular former 202 located on the upper side
Is referred to as "upper triangular former 202A", and the lower triangular former 202 is referred to as "lower triangular former 2".
02B ".

The perforation blade 502 is a score cutting blade which is driven to rotate while being pressed against the surface of the perforation blade receiving roller 504 to push and cut the shrink film 42. The perforation blade 502 and the perforation blade receiving roller 504 correspond to the unsealing portion forming means included in the shrink packaging device according to the present invention.

The rotation of the film perforating roller 110 is transmitted to the perforation blade receiving roller 504 by the belt 506 so that the perforating blade receiving roller 504 rotates at a peripheral speed substantially equal to the conveying speed of the shrink film 42.

However, in the shrink wrapping apparatus 1000, not only the perforation blade receiving roller 504 but also the perforation blade 502 is provided with a drive unit, and the drive unit drives the peripheral speed substantially equal to the conveying speed of the shrink film 42. You may rotate. Further, only the perforation blade 502 is rotated at a peripheral speed substantially equal to the conveyance speed of the shrink film 42, and the perforation receiving roller 504 is driven to rotate by the frictional force between the shrink film 42 and the perforation blade 502. May be.

Examples of the drive unit include a belt and a chain for transmitting the rotation of the film perforating roller 110 to the rotary shaft of the perforation blade 502, a gear, and a motor for rotating the perforation blade 502, but preferable ones are preferable. Examples of the friction wheel include a friction wheel 514 driven by a frictional force with the shrink film 42 fed near the perforation blade receiving roller 504.

As shown in FIG. 11, the friction wheel 514 includes a disc portion 514B and a disc portion 514, which are concentrically fixed to one end of the rotary shaft 502A of the perforation blade 502.
An outer ring portion 514A fitted to the outer peripheral surface of B and abutting on the shrink film 42. The outer ring portion 514A is preferably formed of a flexible material having a large friction coefficient such as sponge rubber, and the outer diameter thereof is preferably substantially the same as the outer diameter of the perforation blade 502.

The friction wheel 51 on the rotary shaft 502A
4 is rotatably supported by a bearing 516 at the end opposite to the fixed side. The bearing 516 is fixed to a base (not shown) of the shrink wrapping apparatus 1000 by appropriate means.

By providing a driving unit on the perforation blade 502, the perforation blade 502 is provided at the valley portion of the perforation blade 502.
The problem that the rotation of the machine stops and the perforations continue is prevented.

When the shrink film 42 is fed, an alarm is output when the perforation blade 502 does not rotate, so that the rotation of the perforation blade 502 is stopped and a continuous perforation is generated. Since it can be detected early, it is possible to prevent the occurrence of defective products having continuous perforations.

Further, if a one-way mechanism is provided in the drive section, the perforating roller 1 in the shrink film 42 is provided.
When slack occurs between 10 and the perforation blade 502,
The rotation of the perforation blade 502 is prevented from stopping until this slack is removed.

In addition, in the above case, the perforation blade 5
02 and the perforation blade receiving roller 504, contrary to the positional relationship shown in FIGS. 9 and 10, the perforation blade 502 abuts the lower surface of the shrink film 42 at the time of feeding, and the upper surface of the shrink film 42 is abutted. If the perforation blade receiving roller 504 is disposed so as to abut, the structure of the drive unit is simplified.

The seal portion 300 is a triangular former 202.
It is provided adjacent to the downstream side of the triangular former 202 along the conveyance direction a which is turned by 90 °.

The seal portion 300 is made up of the shrink film 4
L seal bar 3 which is located above the transport path 2 and has an L-shaped planar shape and which cuts into an L-shape while sealing the shrink film 42 along the outer periphery of the assembly 2.
02 and the transport path of the shrink film 42, and L
It is located below the seal bar 302 and is located between the L seal bar 302 and the L seal bar receiver 304, which receives the L seal bar 302 at the time of sealing, and the shrink film 42 and the assembly 2 are arranged. An L seal conveyor 306 that conveys the L seal bar 302 and the L
Shrink film winding section 30 for winding the remaining shrink film 42 sealed by the seal bar 302
8 and the film drive chains 310 and 312 that are provided adjacent to the L seal bar 302 and that convey the shrink film 42 toward the shrink film winding portion 308 while holding the side edge portions thereof. A heat resistant rubber plate is attached to the upper surface of the L seal bar receiver 304.
Note that, in FIG. 9, the film drive chain 310 located above the transporting path of the shrink film 42 is illustrated as being located far above the L seal bar 302, but in reality, in FIG. As indicated by the chain double-dashed line, the shrink film 42 is arranged so as to face the film drive chain 312 with the transport path of the shrink film 42 interposed therebetween. The film drive chain 312 is driven by an appropriate drive means such as a motor, and the film drive chain 310 follows the film drive chain 312.

FIG. 12 shows a vertical cross section of the L seal bar 302.

As shown in FIG. 12, the L seal bar includes a plate-shaped seal bar 302A and a pair of film retainers 302 provided so as to cover the seal bar 302A from both sides.
B and a cutting blade 302C which is planted at the tip of the seal bar 302A and cuts the shrink film 42 at the time of sealing.
With.

A seal bar heater 302D for heating the seal bar 302A is provided in the vicinity of the cutting blade 302C inside the seal bar 302A.

The film retainer 302B has a fixing bolt 3
02E, the steady rest bolt 302F, and the steady rest nut 302G are fixed to the seal bar 302A.

The operation of the shrink wrapping device 1000 will be described below.

In the double-folded film supply section 100, the original roll 102 is mounted so that the fold 4C of the shrink film 42 is located on the left side in FIG.

The shrink film 42 in the two-fold state unwound from the original roll 102 is shown in FIGS. 9 and 10.
As shown in FIG. 5, the film is wrapped around the film placing roller 104 and the pass roller 116, and is conveyed in the direction of arrow a by the tension roller 106 and the nip roller 108. The shrink film 42 that has passed between the tension roller 106 and the nip roller 108 is wound around the film perforating roller 110, and at the same time, an air hole is formed by the projection 110A provided on the surface of the film perforating roller 110. .

The film perforating roller 110 rotates at the same peripheral speed as the conveying speed of the shrink film 42. The rotation of the film perforating roller 110 is also transmitted to the perforation blade receiving roller 504 by the belt 506, and the perforation blade receiving roller 504 is also driven at the same peripheral speed as the transport speed of the shrink film 42.

Next, the shrink film 42 is processed by the pass rollers 112 and 114 to form the triangular former 202.
At the same time as being guided to, the pass roller 114 and the triangular former 202 open the C-shape to separate the upper shrink film 4A and the lower shrink film 4B.

The upper shrink film 4A passes through the pass roller 114 and then passes between the perforation blade 502 and the perforation blade receiving roller 504, whereby the upper shrink film 4A is pressed by the perforation blade 502 into a point shape and cut along the longitudinal direction. A perforation 8 is formed. On the other hand, the lower shrink film 4B has the perforation blade 50 after passing the pass roller 114.
It is guided to the lower triangular former 202B of the triangular formers 202 without passing between 2 and the perforation blade receiving roller 504. Therefore, the perforations 8 are formed only on the upper shrink film 4A.

As shown in FIG. 9, the upper shrink film 4A is wound around the upper triangular former 202A of the triangular formers 202 in the direction from the upper surface to the lower surface. On the other hand, the lower shrink film 4B is wound around the lower triangular former 202B in the direction from the lower surface to the upper surface. The fold 4C of the shrink film 42 is bent at a right angle at the left ends of the upper triangular former 202A and the lower triangular former 202B.

The assembly 2 is placed on the product conveyor 204 and inserted between the upper triangular former 202A and the lower triangular former 202B, and the upper surface, the lower surface, and the side surface on the side facing the paper surface in FIG. 9 shrink. Covered by film 42.

The assembly 2 covered with the shrink film 42 is further conveyed by the product conveyor 204 along the conveying direction a, and by the L seal conveyor 306, as shown in FIG. Is transported to a position adjacent to the downstream side of.

FIG. 13 shows a state in which the shrink film 42 is sealed and cut in the seal portion 300 as viewed from above.

When the assembly 2 wrapped in the shrink film 42 moves to the position of the seal portion 300, the L seal bar 3 is placed so as to face the seal portion 6 formed at the end of the shrink film 42 in the previous shrink packaging.
02 descends toward the shrink film 42. L
When the seal bar 302 descends, the upper shrink film 4A and the lower shrink film 4B are sandwiched between the L seal bar receiver 304 and the tip ends of the film retainer 302B and the cutting blade 302C.

Here, in the L seal bar 302,
Since the seal bar heater 302D is previously energized and the seal bar 302A and the cutting blade 302C are heated, the heat causes the upper shrink film 4A and the lower shrink film 4B to be heat-sealed and the cutting blade 30.
Cut by 2C.

Thus, the film drive chain 310
The shrink film 42 is formed with an L-shaped seal portion 6 that extends along with and is bent at a right angle toward the fold portion 4C at the end on the upstream side with respect to the transport direction a. The sealing portion 6 is continuous with the heat-sealing portion 6 formed at the time of the previous sealing at the end on the downstream side with respect to the transport direction a, and has a U-shape as a whole. The upper shrink film 4A and the lower shrink film 4B are joined to each other by the seal portion 6 and the fold portion 4C to form a bag-shaped body that houses the assembly 2 therein.

The assembly 2 sealed in the sealing section 300 is conveyed into the shrink tunnel 400 by the L-sealing conveyor 306. Then, the shrink film 42 is heated in the shrink tunnel 400 at a temperature equal to or higher than the shrinking temperature of the shrink film 42 and the shrink film 42 shrinks, whereby the shrink package 10 shown in FIG. 1 is obtained.

Shrink packaging apparatus 10 according to the sixth embodiment
In 00, since the perforations 8 are formed only on the upper shrink film 4A, the shrink tunnel 40
The perforations 8 will not be broken during heating within 0.

If the assembly 2 is placed on the product conveyor 204, the assembly 2 is automatically sent to the seal part 300 and then to the shrink tunnel 400 to be shrink-wrapped. , The operator simply places the assembly 2 at the upstream end of the product conveyor at regular intervals. Therefore, the shrink wrapping apparatus 1000 is easy to operate.

Furthermore, the shrink film 4 in the form of two folds
Since the assembly 2 is sandwiched from above and below by shrink wrapping with 2, the seal portion 300 can be simplified in structure by sealing only two sides along the outer periphery of the assembly 2.

7. Embodiment 7 FIG. 14 shows the overall configuration of another example of the shrink wrapping device according to the present invention. 14, the same reference numerals as those in FIGS. 9 and 10 denote the same elements as those shown in the drawings.

Shrink packaging apparatus 10 according to the seventh embodiment
As shown in FIG. 14, the shrink wrapping device 02 according to the sixth embodiment is different from the sewing machine blade 502 shown in FIG. It has the same configuration as.

In the shrink wrapping device 1002,
The laser light irradiation device 508 is a perforation blade receiving roller 50.
The upper triangular former 202A is provided above the lower triangular former 202A or the lower triangular former 202B.
It may be provided below and adjacent to.

In the shrink packaging device 1002,
Perforations are formed by irradiating the upper shrink film 4A or the lower shrink film 4B with laser light at regular intervals.

Therefore, unlike the shrink wrapping apparatus according to the sixth embodiment, it is not always necessary to rotate the perforation blade receiving roller 504 at the same speed as the film perforating roller 110. When the laser light irradiation device 508 is provided at a position facing the upper triangular former 202A, the laser light emitted downward from the laser light irradiation device 508 passes through the upper shrink film 4A,
Since it is blocked by the upper triangular former 202A, it cannot reach the lower shrink film 4B. Therefore, since the perforation is not formed even on the lower shrink film 4B by the laser light, the perforation blade receiving roller 504 can be omitted. This is a laser light irradiation device 50.
The same applies to the case where 8 is provided at a position facing the lower triangular former 202B.

The shrink wrapping apparatus 1002 is the same as the shrink wrapping apparatus 10 according to the sixth embodiment except for the above points.
It has the same features as 00.

8. Embodiment 8 With respect to still another example of the shrink wrapping apparatus according to the present invention, the overall configuration is shown in FIG. 15, and the configuration of the double-folded film supply unit is schematically shown in FIG. 15 and 16
9, the same reference numerals as those in FIGS. 9 and 10 denote the same elements as those shown in the drawings.

Shrink packaging apparatus 10 according to the eighth embodiment
04 has the same configuration as the shrink wrapping apparatus 1000 according to the sixth embodiment as shown in FIGS. 15 and 16, except that a perforation forming roller 510 is used instead of the perforation blade 502.

The perforation forming roller 510 is provided at the same position as the perforation blade 502 in the shrink wrapping apparatus 1000 so as to be orthogonal to the transport direction a of the shrink film 42, and the surface of the cylinder 510A. The perforation blades 5 planted in a row along the axial direction
10B and. The perforation blade 510B is the same as the perforation blade 502 in the shrink wrapping apparatus 1000 in that it is a score cutting blade.

A belt 512 is provided between the perforation forming roller 510 and the perforation blade receiving roller 504, and the rotation of the film perforating roller 110 is transmitted to the perforation forming roller 510 by the belt 506 and the belt 512. . As a result, the perforation forming roller 510 rotates at a predetermined speed to form the perforations 8 on the upper shrink film 4A in a direction orthogonal to the transport direction a, in other words, in a direction orthogonal to the fold portion 4C. .

Therefore, the shrink packaging device 1004
According to this, a shrink wrapping body having the form shown in FIG. 2 is obtained.

With the exception of this point, the shrink wrapping device 1
004 is the shrink wrapping apparatus 100 according to the sixth embodiment.
It has the same features as 0.

[0122]

As described above, according to the present invention,
In a shrink wrap provided with perforations, a shrink wrap that does not tear at the perforations even when shrink wrapping is performed under conditions such that the shrink film shrinks with high tension, and the shrink wrap is obtained. A shrink wrapping machine is provided.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a shrink package according to the present invention.

FIG. 2 is a perspective view showing another example of the shrink package according to the present invention.

FIG. 3 is a perspective view showing still another example of the shrink package according to the present invention.

FIG. 4 is a perspective view showing an example of a shrink package in which a paper box having a header is shrink-wrapped, as seen from above.

FIG. 5 is a perspective view showing the shrink wrapping body shown in FIG. 4 as seen from below.

FIG. 6 is a perspective view showing a paper box with a header forming the shrink wrapping body shown in FIGS. 4 and 5;

FIG. 7 is a perspective view showing how to stack the paper boxes shown in FIG.

FIG. 8 is a perspective view showing another example of a shrink package in which a paper box having a header is shrink-wrapped, the paper box, an assembly formed by arranging the paper boxes, and the shrink package itself. .

FIG. 9 is a perspective view showing an overall configuration of an example of the shrink wrapping device according to the present invention.

FIG. 10 is a schematic layout diagram showing an arrangement of respective constituent elements in a double-fold film supply unit included in the shrink wrapping apparatus shown in FIG. 9.

FIG. 11 is an enlarged view showing the configuration of another example of the perforation blade provided in the shrink wrapping device shown in FIG. 9.

12 is a vertical cross-sectional view showing the structure of an L seal bar included in the shrink wrapping device shown in FIG.

FIG. 13 is a top view showing a portion where the shrink film 42 is sealed and cut in the seal part of the shrink wrapping device shown in FIG. 9.

FIG. 14 is a perspective view showing the overall configuration of another example of the shrink wrapping device according to the present invention.

FIG. 15 is a perspective view showing an overall configuration of still another example of the shrink wrapping device according to the present invention.

16 is a schematic layout diagram showing an arrangement of respective constituent elements in a double-folded film supply unit included in the shrink wrapping apparatus shown in FIG.

FIG. 17 is a perspective view showing an example of a shrink package that has been conventionally studied.

FIG. 18 is a schematic diagram showing an example of a shrink wrapping apparatus for manufacturing the shrink wrapping body shown in FIG. 17.

FIG. 19 is a flowchart showing a procedure of shrink-wrapping a paper box assembly by the shrink-wrapping apparatus shown in FIG. 18.

FIG. 20 is a perspective view showing an example of a shrink wrapping body conventionally studied for a paper box having a header.

[Explanation of symbols]

2 aggregate 2A paper box 4 shrink wrap 4A Upper shrink film 4B Lower shrink film 6 Seal part 8 perforations 10 Shrink packaging 12 Shrink packaging 14 Shrink packaging 16 shrink packaging 20 paper boxes 21 paper boxes 42 Shrink film 100 Half-fold film supply section 200 Cover 202 Triangle Former 300 seal part 302 L seal bar 400 shrink tunnel

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 3E050 AA03 AB03 AB08 BA06 BA14                       CA01 CB03 CB07 CC03 CC10                       DB04 DD03 DE01 DF01 DF06                       DF10 FA02 FB02 FB07 GA08                       GB05 JA02                 3E067 AA24 AC03 AC11 AC12 BA06B                       BA20C BB02B BB14C BC06B                       CA30 EA29 EB03 FB01

Claims (8)

[Claims] 1. A shrink wrap including a packaged article and a shrink wrapping that wraps the packaged article in a close contact state, which is more easily torn when opened than other portions of the shrink wrap. A shrink wrapping body, in which an openable part that can be formed is formed along a part of the outer circumference of the shrink wrapping. 2. The article to be packaged has a flat shape, and the shrink wrap has the unsealing portion formed only in a portion in contact with one surface of the article to be packaged. Shrink wrap. 3. The packaged article comprises a plurality of box-shaped bodies.
The shrink wrapping body according to claim 1 or 2, which is a row or an assembly formed by collecting two or more rows. 4. A mount having an opening formed so that at least one of the box-shaped bodies can be seen when the aggregate is placed on one surface, and the aggregate is formed on the mount. The shrink package according to claim 3, which is shrink-wrapped in a mounted state. 5. The opening portion is a perforation line.
The shrink wrapping body according to any one of items 1 to 4. 6. A shrink film supply means for supplying a shrink film, a packaged article covering means for covering both sides of the packaged article with the shrink film supplied from the shrink film supply means, and the packaged article coating means. An unsealing portion forming means for forming an unsealing portion in a portion of the supplied shrink film which is in contact with one surface of the packaged article, and a shrink film obtained by coating the packaged article in the packaged article coating means, the packaged article. A sealing means for sealing along the outer periphery of the package to form a package, and a heat shrinking means for heating the package formed in the sealing means and shrinking the shrink film to form a shrink wrap. A shrink packaging device characterized by the above. 7. The shrink film supply means comprises a double-folded film supply part for supplying the shrink film in a state of being folded in half in the longitudinal direction, and the packaged article covering means comprises the double-folded film. A space forming portion that separates side edges of the shrink film supplied from the supply portion to form a space, and a packaged article in which the packaged article is inserted into the space formed in the shrink film in the space forming portion. An opening portion forming means for forming an opening portion at a portion between one of the side edges of the shrink film and a fold portion formed by being folded in two. The shrink wrapping apparatus according to claim 6, further comprising a section. 8. The space forming part is wound with a shrink film in a two-fold state supplied from the two-fold film supplying part to form a space by separating side edges of the shrink film from each other and at the same time. The shrink wrapping device according to claim 7, further comprising a triangular former formed of a pair of triangular plate-shaped members for changing the transport direction of the shrink film by 90 °.