JP2020029270A - Shrink packaging body and manufacturing method of the same and manufacturing device of the same - Google Patents

Abstract

To enable pillow packaging which can protect an object to be packaged more surely, in a shrink packaging body using a cellular cushioning material.SOLUTION: The shrink packaging body of the invention is a packaging body 100 comprising a resin packaging material 1 and an object p to be packaged. The packaging material 1 is a sheet-like object including a cellular cushioning material 2. In the cellular cushioning material 2, a plurality of convex cells k are made to protrude from one surface of the packaging material 1. The plurality of cells k distribute substantially on the whole one surface of the packaging material 1. The one surface of the packaging material 1 faces the object p to be packaged, and the tip sides of the plurality of convex cells k come into contact with the surface of the object p to be packaged. The packaging body 100 is a pillow packaging body. The packaging material 1 is wound around the object p to be packaged. A palm-joint part 6 is formed of both end parts of the one surface in the winding direction of the packaging material 1 that are fused with each other. Thus, the packaging material 1 is used to provide the shrink packaging body comprising a heat-shrinkable film 5 which is disposed on the other surface opposite to the one surface, and which presses the cells k toward the object p to be packaged.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a shrink package, a method for manufacturing the same, and a device for manufacturing the same.

2. Description of the Related Art Conventionally, a method of packaging articles in distribution is such that it is hard to receive an impact from outside during transportation, such as a bag making machine with an air cap (registered trademark) sheet lined or a cardboard box.

For example, in Patent Literature 1, an electric heater H is installed above a vacuum pulling board 2 and an upper frame 6 that clamps an upper wrapping film F between the electric heater H and the vacuum pulling board 2 to vertically open and close. And the lower frame 7 is set substantially horizontally, and the packaged object is placed on the upper surface of the vacuum pulling board 2 via the lower packaging plate, and the upper packaging film F is placed on the upper and lower frames 6 and 7. Immediately after being raised and softened by the electric heater H, the upper and lower frames 6 and 7 lower the heated and softened upper wrapping film F onto the object to be wrapped on the vacuum integrator 2 and the lower wrapping plate, and at the same time apply vacuum. In a vacuum packaging machine configured so that the upper packaging film F is vacuum-adhered to the object to be packaged and the lower packaging plate material by a vacuum drawing action by the pulling platen, the thick lower packaging platen 3 is placed on the vacuum pulling platen 2. Numerous hemispherical air chambers on top through A bubble cushioning material 5 made of plastics formed with is formed, an article P to be packaged is placed on the bubble cushioning material 5, and the upper packaging film F in a heated and softened state, and the vacuum pulling action by the vacuum platen 2 (Electro-pneumatic packaging apparatus using a bubble cushioning material characterized by vacuum-packaging the article to be packaged P (Patent Document 1 and Claims of Utility Model Registration and FIG. 1)).

The apparatus disclosed in Patent Document 1 places a lower packaging base plate 3 on which a bubble cushioning material 5 is placed on an upper surface on a vacuum pulling platen 2, and places various types of objects P to be packaged on the bubble cushioning material 5. After being placed, the upper packaging film F is raised by the clamped upper and lower frames 6 and 7, the upper packaging film F is heated and softened by the electric heater H, and the upper packaging film F is heated and softened by the lowering of the upper and lower frames 6 and 7. , And the upper packaging film F is sucked by the vacuum action on the vacuum pulling platen 2 so that the upper packaging film F is sucked by a gap between a number of semicircular convex portions formed on the upper surface of the bubble cushioning material 5. The package P, the bubble cushioning material 5, and the lower packaging base plate 3 are brought into close vacuum contact with each other (see page 5 of the specification of Patent Document 1).

As shown in FIG. 2, the package formed by using the apparatus of the cited document 1 is a packaged object on a sheet of bubble-absorbing material 5 which is spread and stacked on a lower packaging base plate 3 which is hardly deformed. The upper packaging film F is spread by vacuum adhesion in a state where P is arranged (FIG. 2 of Patent Document 1).
Accordingly, in the formed package, only the bottom of the package P is protected by the lower packaging base plate 3 and the bubble cushioning material 5, and when an object comes into contact with the package from the outside, There was a fear that the upper part and the side part of the packaged object P might be damaged.

A package disclosed in Patent Document 2 has been proposed as a technique improved from Patent Literature 1, that is, a technique for more reliably protecting an object to be packaged with a bubble cushioning material and further reducing the number of components described above.
That is, in Patent Document 2, a flat synthetic resin film is spread on the open side of a synthetic resin sheet forming a number of convex portions, and a synthetic resin hollow body sheet having a number of hollow sealed chambers is formed, There is disclosed a shrink bubble cushioning material in which a heat-shrinkable synthetic resin film (heat-shrinkable resin film) is integrally spread on the synthetic resin hollow body sheet (Claim 1 of Patent Document 2). According to claim 3, the shrink bubble cushioning material is formed only from a heat-shrinkable synthetic resin film spread on the open side of a synthetic resin sheet in which the plurality of convex portions are formed. It is shown.
According to Patent Literature 2, it is considered that the main part of the packaging is a bubble cushioning material, and the configuration such as the lower packaging base plate 3 of Patent Literature 1 and the bag making in which the bubble cushioning material is lined are unnecessary. In addition, it can be said that by wrapping the object to be packaged in the bubble cushioning material and shrinking, the convex bubbles of the bubble cushioning material are pressed against the object to be packaged, and the adhesion between the bubble cushioning material and the object to be packaged is also ensured.

On the other hand, pillow packaging with high versatility is widely required depending on the type and use of the article to be packaged.
Pillow packaging is a method of rolling a flexible resin sheet so as to surround the object to be packaged, overlapping and sealing both ends of the sheet in a rolled direction in a state in which the two sides are joined together, and sealing the rolled sheet. It is completed by closing each of both openings with heat seal.
Pillow packaging has an extremely wide range of applications due to its aesthetics and ease of printing and labeling of product information on the packaging surface.
However, pillow packaging is not possible with the packaging disclosed in Patent Document 1. Further, what is shown in Patent Document 2 is based on the premise of three-side seal packaging (FIG. 6), and there is no disclosure, suggestion, or motivation about pillow packaging.

As far as the inventor of the present invention perceives, in forming the package s using the bubble cushioning material, the method shown in FIGS. 9A to 9C attached to the present application is actually employed.
First, the bubble cushioning material s1 (air cap sheet) is placed on a heat shrinkable resin film s2 (shrink film) larger than the bubble cushioning material s1, and the packaged object P is placed on the heat shrinkable resin film s2. It is arranged (FIG. 9A). The bubble cushioning material s1 overlaps the first resin sheet s11 on which the plurality of convex bubbles k protrudes from one surface with the surface opposite to the one surface and opens the bubble k on the opposite surface. The second resin sheet s12 that covers the opening is bonded together. In the packaging, the second resin sheet s12 faces the heat-shrinkable resin film s2 (downward), and the first resin sheet s11 faces the packaged object P. That is, the packaged object P is placed on the bubble k.

Next, the heat-shrinkable resin film s2 is rolled together with the bubble cushioning material s1 to extend along the periphery of the package P, that is, from the bottom side to the top side of the package P (FIG. 9B). The bubble cushioning material s1 is smaller than the heat-shrinkable resin film s2, and the bubble cushioning material s1 extends along the middle of the side surface of the packaged object P as described above, in this example, along the lower half of the side surface. The ends of the heat-shrinkable resin film s2 that are rounded and surrounded around the packaged object P, that is, from the bottom side to the top side, in the rounded direction are further upward from the outer edge s10 of the bubble cushioning material 1. (FIG. 9B). On the upper surface side of the packaged object P, the insides of the ends s20 and s20, that is, the surfaces facing the packaged object P are overlapped to form a so-called palm joint state and are thermally fused (FIG. 9C). By placing the pillow package formed by heat-sealing the joint portions g in an atmosphere heated to a temperature at which the heat-shrinkable resin film s2 shrinks, the heat-shrinkable resin film s2 is shrunk to form a shrink package. In the case shown in FIG. 9 as well, the bubbles k of the bubble cushioning material s1 are pressed against the article P by shrinking the heat-shrinkable resin film s2.

Japanese Utility Model Publication No. 60-99208 JP-A-63-80

However, in the packaging shown in FIG. 9, the bubble cushioning material s1 is not interposed between the heat-shrinkable resin film s2 and the packaged object P in the vicinity of the heat-sealed joint portion g, and the bubble cushioning is not performed. It cannot be said that the material to be packaged P is reliably protected by the material s1. In this example, the bubble cushion s1 is not formed along the upper half of the packaged object P (particularly, the upper surface of the packaged object P) (FIG. 9C).

In the background described above, an undulating bubble cushioning material s1 called a bubble k is not suitable for heat fusion in a closed state, and is exclusively used as a cushioning material for protecting the packaged object P and not involved in heat fusion. This is because it has been considered appropriate to form the heat-sealed joint portion g on the heat-shrinkable resin film s2 which is separate from the bubble buffer material s1 and is also used for shrinkage due to heat shrinkage.

The inventor of the present invention has confirmed that, at the time of packaging (at the time of manufacturing the package), two sides of the pillow package having a rectangular shape in a plan view, extending at both ends of the apron portion g of the pillow package in a direction intersecting with the apron portion g. The sealing portions (top seal and tail seal) can be formed without any problem by the interposition of the bubble cushioning material as in the formation of each seal disclosed in Patent Document 2. However, both ends in the width direction of the band-shaped bubble cushioning material g are formed. It could not be properly fused to form a joint.
While the bubble cushioning material did not pose a problem in the formation of the top seal and the tail seal, the reason why the thermal fusion at the joint portion g of the pillow package with the bubble cushioning material could not be performed well as described above was sufficiently sufficient so far. It was not understood.
Eventually, when looking at the market, it was found that the bubble cushioning material s1 having the undulation due to the bubbles as shown in FIG. 9 was not interposed in the joint portion g, but the bubble cushioning material s1 was extended to the joint portion g. There was nothing intervening.

The inventor of the present invention has found that, after trial and error, when heat is sequentially applied to the packaging material along the feeding direction of the packaging material to form the joint portion, the unevenness in the heating temperature in the feeding direction causes large undulations in the bubble buffer. We found that it was a fatal factor in the formation of the joint part by wood.
That is, the inventor of the present invention focused on the following points.
In the formation of the above-mentioned top seal and tail seal, the heating unit is brought into contact with the packaging material at a time so as to cross the feeding direction with respect to the packaging material sent in the longitudinal direction of the band-shaped packaging material, and is heated to form the entire length of the seal. At one time. Therefore, it is considered that the influence of the change in the heating temperature during the contact is small. On the other hand, while the belt-shaped wrapping material is being sent in the longitudinal direction, the heating portion is sequentially changed along the lengthwise direction and brought into contact with the wrapping material, and the wrapping material is sequentially thermally fused to form a fusion portion (the joint portion). When forming g), it is considered that the variation in the heating temperature during the contact greatly affects the formation of the fused portion. The inventor of the present invention considered that the temperature variation during the contact described above was a fatal obstacle to the formation of the palm joint in the bubble cushioning material.
Based on the above findings, the inventor of the present invention has created a novel method capable of appropriately forming a joint portion using a bubble cushioning material, and has solved the above-mentioned problem.

In the present invention, a package comprising a resin-made packaging material and an object to be packaged covered with the packaging material, wherein the packaging material is a sheet-shaped material having a bubble cushioning material, The cushioning material causes a plurality of convex air bubbles to protrude from one surface of the packaging material, and the plurality of air bubbles are distributed or arranged on substantially the entirety of the one surface of the packaging material. Wherein the one surface of the packaging material faces the packaged object, and the tip sides of the plurality of convex bubbles come into contact with the packaged object surface, and the package is a pillow package. The packaging material is wound around the object to be packaged, and the one surface at both ends in the winding direction of the packaging material forms a jointed palm portion that is joined together and fused. A heat-shrinkable film that has been heat-shrinked to a surface opposite to the surface of the heat-shrinkable film, The serial bubbles to provide a shrink packaging body for pressing toward the articles to be packaged.
Further, in the present invention, the bubble cushioning material is a sheet-like material in which a polyethylene sheet and a polyethylene closing film overlapping the sheet are integrated, and one surface of the sheet is formed of the packaging material. The one surface is provided with the plurality of bubbles, the closing film is provided on a surface opposite to the one surface with respect to the sheet, closes a base end opening of the bubbles, and a bubble chamber. The heat-shrinkable film is a resin film having heat-shrinkability, which covers the surface of the closing film on the opposite side to the sheet, and in the joint portion, at least the winding direction of the sheet. What provided the both sides constituting the said fusion | bonded part was able to be provided.
Furthermore, in the present invention, a plurality of convex air bubbles protruding from one surface are distributed or arranged substantially over the entire surface of the one surface, and a heat shrink provided on the other surface of the air bubble cushion is provided. A film-like packaging material including a film, moving the packaging material along the longitudinal direction of the belt-like packaging material, disposing the packaging material on the one surface of the bubble cushioning material during movement, By winding around the portion of the band-shaped packaging material that protrudes to both sides in the width direction sequentially so as to surround the perimeter of the article to be packaged, by overlapping and heating both ends in the width direction of the packaging material so as to overlap each other. A gasket portion in which both ends in the width direction of the bubble cushioning material are thermally fused is formed, and the packaged material of the packaging material is formed in the longitudinal direction of the packaging material formed into a cylindrical shape after the thermal fusion. Heat seal the parts located before and after and close By cutting the band-shaped packaging material at the heat-sealed portion, the pillow packaging body is provided with the gasket portion that covers substantially the entire surface of the packaged object with the bubble cushioning material. Was heated to a temperature at which the heat-shrinkable film thermally shrinks, and a shrink-package manufacturing method for shrinking the packaged object via the bubble-cushioning material could be provided.
Still further, in the present invention, a plurality of convex air bubbles protruding from one surface are distributed or arranged substantially over the entire surface of the one surface, and the heat shrinkage provided on the other surface of the air bubble cushion is provided. A packaging device for packaging an article to be packaged using a band-shaped packaging material including a film, a holding unit for holding a web wound with the packaging material, and a drawing unit for sequentially pulling out the packaging material from the holding unit. And an arrangement portion for arranging the object to be packaged on the one surface of the extracted packaging material, and the packaging material directed toward the object to be packaged by sequentially contacting both sides in the width direction of the extracted packaging material. A guide portion for guiding both sides, a bubble buffer fusion bonding section for heating the both sides to thermally fuse at least both sides of the bubble buffer in the width direction, and transferring the packaging material to the packaged object Heat seal the front and rear parts of the A sealing section, a cutting section for cutting the packaging material at the heat-sealed portion, and a heating section for shrinking the heat-shrinkable film by heating, wherein a heater is provided in the bubble cushioning material fusion-bonding section. Is provided, the bubble cushioning material fusion processing section is to maintain a temperature necessary for the heat fusion by the heat generated by the heater,
The heater has a heat-sealing temperature of 130 degrees Celsius, a polyethylene sheet having a plurality of air bubbles having a diameter of 10 mm and a protrusion width of 3.5 mm as the air bubble cushioning material, and the polyethylene heat shrink film. Using the configured packaging material, the feeding speed of the packaging material is set to 30 mm per second, and the belt-shaped packaging material having a width of 240 mm is fed 9 m while the temperature of the bubble buffer material fusion processing unit is changed to be greater than 128 degrees Celsius. The guide portion guides the wrapping material so as to surround the object to be packaged along with the drawer of the drawer portion so as to form a joint on both sides. At least two sides of the bubble cushioning material are heat-fused by overlapping the two sides and heating the two sides of the packaging material which are joined together by the bubble cushioning material fusion processing unit, thereby heating the two sides. And a pillow package having the joint portion covering substantially the entire surface of the packaged object with the bubble cushioning material by the heat sealing by the seal processing unit and the cutting by the cutting unit. The heating unit is disposed downstream of the cutting unit in the transport direction, and the heat-shrinkable film is contracted by the heating during the movement of the pillow package, so that the bubble buffer material Thus, an apparatus for manufacturing a shrink package can be provided that shrinks the packaged object into a shrink package.
Note that the pillow package forming the pillow package includes a pillow package (forward pillow package) formed with the joint portion facing down and a pillow package (reverse pillow package) created with the joint portion facing upward.

The present invention has realized a pillow package that can more reliably protect an object to be packaged in a shrink package using a bubble cushioning material.
The present invention was able to provide a shrink wrapped body that was pillow wrapped and that was entirely covered with a bubble cushioning material without bias. Specifically, the present invention has provided a novel shrink wrapping body in which an air bubble cushioning material is interposed also between the joint portion of the pillow package or the vicinity of the joint portion and the article to be packaged.
For this reason, the shrink wrapper according to the present invention is a pillow wrapper having high versatility, in which a heat-shrinkable film presses the tips of a plurality of convex air bubbles against the wrapped object from all around the wrapped object. Can be more reliably protected.
Further, the present invention has provided a method and apparatus for realizing the above-mentioned package.

(A)-(C) are schematic sectional drawings which show the process of forming as a pillow package regarding the package which concerns on this invention. (A) is a perspective view of the pillow package before shrinking the package according to the present invention, and (B) is a perspective view showing a state where the pillow package of (A) is shrunk to complete the package according to the present invention. FIG. (A) is an overall schematic side view of a manufacturing apparatus for a shrink wrapper according to the present invention, (B) is a schematic side view showing a part for performing pillow packaging (reverse pillow packaging) in the manufacturing apparatus of (A), and (C). 3 is a plan view of a main part of the heating unit of FIG. 3A is an enlarged cross-sectional view taken along line XX (an enlarged front view at the position XX) of FIG. 3B, FIG. 3B is a cross-sectional view taken along line YY of FIG. 3B, and FIG. FIG. (A) is a front view of the palm adjustment member shown in FIG. 4 (A), (B) is a front view showing a modification of the palm adjustment member of (A), and (C) is a longitudinal section of the palm adjustment member of (B). FIG. 3D is an enlarged side view of an essential part showing the operation of the top / tail seal device of FIGS. 3A and 3B in an enlarged manner. (A)-(D) are perspective views which show the process of manufacturing the pillow package shown in FIG. 1 by reverse pillow packaging. FIG. 3A is a perspective view showing a state (packing device) in which the pillow package shown in FIG. 1 is manufactured in a normal pillow package, and FIG. 3B is a cross-section formed on a packaging material using the device shown in FIG. FIG. 7C is an explanatory view showing a state in which the change is performed in a plan view, and FIG. 7C is an explanatory view showing a state in which the modified example of FIG. (A) is an explanatory view showing a further modified example of FIG. 7 (B) in a plan view, (B) is an explanatory view showing a state of (A) in a side view, and (C) is an explanatory view in FIG. 7 (C). Explanatory drawing which shows the state which planarly viewed about the example which changed further. (A)-(C) is explanatory drawing which shows the formation process of the conventional pillow package before completion of a shrink package.

An embodiment of the present invention will be described below with reference to the drawings. The embodiments are merely examples, and the technical scope of the present invention should not be construed as being limited to the embodiments described below.

(Outline of package)
A package 100 according to the present invention (hereinafter simply referred to as a package 100 as required) includes a resin-made packaging material 1 and a packaged object p covered by the packaging material 1 (FIG. 1). (C)).
This wrapping material 1 is a sheet-like material provided with a bubble cushioning material 2 and a heat shrinkable film 5 (FIG. 1A).
The bubble cushioning material 2 causes a plurality of convex bubbles k to protrude from one surface. The plurality of bubbles k are provided substantially uniformly on substantially the entire one surface of the bubble cushioning material 1 without bias. The one surface of the bubble cushioning material 2 faces the packaged object p, and the leading ends of the plurality of convex bubbles k are brought into contact with substantially the entire surface of the packaged object p (FIG. 1C). The heat-shrinkable film 5 is provided on a surface of the packaging material 1 opposite to the one surface.
The package 100 is a pillow package and a shrink package.
That is, the package 100 is a pillow package having a joint portion 6 in which the inner surfaces of both ends in the winding direction of the sheet-like packaging material 1 wound on the article to be packaged overlap and join together and are fused. In addition, the shrink wrapper presses the air bubbles k of the pillow wrapper toward the packaged object p with the heat-shrinkable film 5 in a heat-shrinked state.

(About packaging material 1)
As described above, the packaging material 1 exemplifies a material constituted by the bubble cushioning material 2 and the heat shrinkable film 5 (FIG. 1A). As the bubble cushioning material 2 of the packaging material 1, an existing one can be used.

More specifically, the bubble cushioning material 2 includes a synthetic resin sheet 3 and a synthetic resin closing film 4 provided integrally with the sheet 3.
As the bubble cushioning material 2, a general material in which each of the sheet 3 and the closing film 4 is made of polyethylene can be used.
Polyethylene (PE) generally has a density of 0.91 to 0.96 g / cubic centimeter and a melting point of 115 to 135 degrees Celsius at normal temperature (25 degrees Celsius) and normal pressure (100 kPa). Polyethylene has differences in average molecular weight, number of molecules, and crystallinity depending on the polymerization method, and density, thermal characteristics, mechanical characteristics, and the like also differ depending on the difference.

The sheet 3 is a rugged sheet having a plurality of convex bubbles k on substantially the entire surface of one surface. The plurality of bubbles k are distributed or arranged on the one surface of the sheet 3. The plurality of bubbles k may be irregularly distributed or may be distributed with regularity. The plurality of bubbles k may be arranged, for example, arranged in a plurality of rows.
In order to appropriately protect the packaged object p, the plurality of bubbles k are preferably arranged so as to be densely distributed.
The one surface of the bubble cushioning material 1 refers to a surface of the packaging material 1 on the side facing the packaged object p, that is, the inner surface i.

The above-mentioned closing film 4 is a flat, undulating sheet that is adhered to the other surface of the sheet 3. The sheet 3 forms a surface opposite to the one surface with respect to the sheet 3 and closes a base end opening of the bubble k to make the bubble k a closed cell chamber. The other surface refers to a surface on the opposite side to the packaged object p, that is, an outer surface after the package is formed. 1 (A) and 1 (B) indicate the outer surface of the heat-shrinkable film 5, that is, the outer surface of the packaging material 1.

In general, the convex portion which becomes the bubble k of the bubble cushioning material 2 of the sheet 3 corresponds to the synthetic resin flat sheet 3 heated to a temperature suitable for shaping the convex portion. It is formed by vacuum suction on a molding roll having a plurality of concave portions. Then, the bubble cushioning material 2 is formed by spreading the flat closing film 4 on the surface of the sheet 3 on the open side of the convex portion.
Said spreading of the closure film 4 on the sheet 3 is generally by heat fusion. The closing film 4 heated to a temperature suitable for heat fusion is brought into contact with the surface on the open side of the sheet 3 on which the convex portion is formed, and is pressed by a pressing means such as a pressure roll. It is heat fused.
The existing bubble cushioning material 2 formed above can be used for the packaging material 1 according to the present invention (not shown).

The above-mentioned heat-shrinkable film 5 is a shrink film made of a synthetic resin having heat-shrinkability. In this example, a polyethylene film is used as the shrink film. However, a polypropylene film can be used as the shrink film.
In particular, it is suitable to employ a shrink film formed by stretching as the heat-shrinkable film 5. As the shrink film, a film having a heat shrinkage suitable for shrinking the packaged object p via the bubble cushioning material 5 is employed.

The heat-shrinkable film 5 is spread on the outer surface of (the closing film 4 of) the bubble cushioning material 2.
As the packaging material 1, a ready-made product in which the heat shrink film 5 is spread on the bubble cushioning material 2 can be employed. Generally, the heat-shrinkable film 5 is spread on the bubble cushioning material 2 after the closing film 4 is spread on the sheet 3 while the temperature of the closing film 4 is at a temperature suitable for spreading the heat-shrinkable film 5. Then, the heat-shrinkable film 5 is brought into contact with the outer surface of the closing film 4 and pressurized and thermally fused (not shown).

The above-mentioned heat fusion of the heat shrinkable film 5 to the closing film 4 needs to be performed so as not to cause the heat shrinkage of the heat shrinkable film 5. For example, as for the heat fusion of the heat shrinkable film 5 to the closure film 4, the temperature of the closure film 4 is reduced to a temperature at which the heat shrinkage of the heat shrinkable film 5 does not occur within a range where the heat fusion is possible. It is necessary to devise such a method.
In the pillow packaging, if the heat-shrinkable film 5 can be handled integrally with the closing film 4 and can be adhered to the closing film 4 to the extent that the heat-shrinkable film 5 does not have to be thermally fused to the closing film 4. That is, as long as the heat-shrinkable film 5 can be handled integrally with the closing film 4, the heat-shrinkable film 5 may be spread on the closing film 4 at a temperature equal to or lower than the above-mentioned fusion temperature of the heat-shrinkable film 5.

By forming both the bubble cushioning material 2 and the heat shrinkable film 5 with a transparent synthetic resin sheet or film, the packaged object p after packaging can be viewed from outside the package. However, in the case of packaging of the article to be packaged p which is not preferable to receive light, both or one of the bubble cushioning material 2 and the heat shrinkable film 5 may be formed of an opaque synthetic resin film.

(Packed item p)
There is no particular limitation on the object to be packaged p as long as it can be packaged with the packaging material 1.
For example, electrical equipment and electronic components, various cords, jigs and mechanical parts such as bolts, containers, medical instruments such as syringes, fruits and vegetables such as fruits and vegetables, other foodstuffs and other foodstuffs, confectionery, tableware, broken items such as vases, Canned goods, bottled goods, personal belongings such as watches and ornaments, and the like can be used as the packaged item p.

(Outline of manufacturing method of package 100 of the present invention)
In the manufacturing method of the package 100 of the present invention, first, a pillow package is formed by packaging the article to be packaged p with the packaging material 1 having the above configuration. Next, a shrink wrapping body for heating the surface of the pillow wrapper (the outer surface of the heat shrinkable film 5) to shrink the heat shrinkable film 5 as described above and wrap the packaged object p via the bubble cushioning material 2; I do.

The plurality of bubbles k of the bubble cushioning material 2 are distributed substantially uniformly without unevenness on the entire inner surface of the sheet 2 as described above in forming the pillow package, and the heat-shrinkable film 5 is formed of the bubble cushioning material 2 ( It covers substantially the entire outer surface of the closure film 4).
The joint part 6 is a fusion part in which the bubbles k are abutted and fused on both side surfaces of the bubble cushioning material 2 where the joints are formed (FIG. 1C). Since the butted bubbles k are melted and fused together, the tip side of the other bubbles k not involved in the fusion is applied to the surface of the package p evenly including the vicinity of the joint portion 6. On the other hand, the bubbles k (bubble chambers) disappear in the joint portion 6 due to thermal fusion during fusion, and both sides of the sheet 3 are flattened and integrated.

In the formation of the joint portion 6 in the present invention, the heat shrinkable film 5 is handled integrally with the bubble cushioning material 2 and the (closing film 4) and forms a part (outside) of the joint portion 6. The heat-shrinkable film 5 is partially heated only at the above-mentioned portion constituting the palm joint portion 6 when the palm joint portion 6 is formed, but the portion other than the palm joint portion 6 is not heated to shrink.
Specifically, the heat-shrinkable film 5 is spread over the entire outer surface of the bubble cushioning material 2. In this example, the left and right (in FIG. 1A) of the sheet 3 of the bubble cushioning material 2 are provided. The end 30, the left and right ends 40 of the closing film 4, and the left and right ends 50 of the heat shrinkable film 5 are in a state where the packaging material 1 is spread by cutting the packaging material 1 by a manufacturing device (packaging device) described later (FIG. They are trimmed to the same position in the left-right direction (in (A)). However, if it constitutes the joint part 6, the left and right ends 30 of the sheet 3, the left and right ends 40 of the closing film 4, and the left and right ends 50 of the heat shrinkable film 5 are not exactly aligned. It can also be implemented.

In the packaging material 1 which is wound around the article to be packaged p to form the joint portion 6 and has a cylindrical shape, the openings at both ends of the cylinder are sealed to form a pillow package (FIG. 2A). The package 100 is transported in a state where the both ends of the cylinder face forward and backward in the feed direction of the package 100, and the leading end and the rear end of the package 100 are sealed in the transport direction to form a seal portion 7 (FIG. 2). (A)).
In the following, the sealing portion 7 on the front end side (downstream side) of the package 100 in the feeding direction of the packaging material 1 is referred to as a front end sealing portion 7a, and the sealing portion on the rear end side (upstream side) in the feeding direction as necessary. 7 is referred to as a rear end seal portion 7b. The front end seal portion 7a corresponds to a top seal described later, and the rear end seal portion 7b corresponds to a tail seal described later.

As described above, the surface (outer surface) of the pillow package is formed by passing the pillow package through a heating atmosphere with respect to the pillow package formed with the joint portion 6, the front seal portion 7a, and the rear seal portion 7b. The provided heat shrinkable film 5 is heat shrunk. That is, the pillow package is passed through an atmosphere set at a temperature at which the heat-shrinkable film 5 thermally shrinks. The pillow package passed through the atmosphere becomes a shrink package (package 100) due to shrinkage of the heat-shrinkable film 5.

Conventionally, the inner surfaces of both ends in the winding direction of the heat-shrinkable film 5, which is a shrink film, are directly joined to each other (FIG. 9C). The present invention has been completed by finding that the joint portion 6 can be formed as described above by abutting the both sides of the bubble cushioning material 2 and thermally fusing them.
When the same polyethylene is used for each of the bubble cushioning material 2 and the heat shrinkable film 5, the joint portion 6 is formed by melting both the bubble cushioning material 2 and the heat shrinkable film 5. However, in forming the joint portion 6, it is easier to form the joint portion 6 if only the bubble cushioning material 2 is melted and the heat shrinkable film 5 is not melted. For this reason, a polyethylene having a higher melting point than the bubble cushioning material 2 is used for the heat-shrinkable film 5, and the joint portion 6 of the packaging material 1 is formed at a temperature lower than the melting point of the heat-shrinkable film 5 and higher than the melting point of the bubble-cushioning material 2. Is also effective. It is also possible to use a polypropylene having a higher melting point than the general polyethylene for the shrink film 5. For example, when polyethylene having a melting point of 130 degrees Celsius is used for the bubble cushioning material 2 and polypropylene having a melting point of 165 degrees Celsius is used for the heat-shrinkable film 5, the heat is melted at 130 degrees Celsius in the joint part 6. Is only a polyethylene foam cushioning material having a melting point of 130 degrees Celsius.

(Configuration example of packaging device)
The manufacturing device (packing device) of the package 100 includes a supply conveyor device a, a film raw material device b, a center conveyor device c, a center device d, a top / tail sealing device e, and an unloading conveyor device f. , A shrink device g, and a control device (not shown) (FIGS. 3 to 6).
Hereinafter, each of the above-described devices constituting the manufacturing apparatus will be sequentially described along the movement of the packaged object p.

(Supply conveyor device a)
The supply conveyor device a includes a belt conveyor a1 that conveys the articles to be packaged p (FIGS. 3A and 3B). 3A and 3B, the belt conveyor a1 sequentially moves the packaged items p from left to right. The belt conveyor a1 is a well-known type that circulates and drives a conveyor belt on which an article to be packaged p is placed. The supply conveyor device a may be any device that transports the articles p to the center conveyor device c, and a known conveyor other than the belt conveyor a1 may be used as the supply conveyor device a.
The belt conveyor a1 of the supply conveyor device a corresponds to an “arrangement portion” in the claims.

(Film source b)
The film raw device b is a device that holds the band-shaped packaging material 1 to be supplied onto the center conveyor device c.
The film raw device b includes a holding shaft b1 that passes through the center of the web 10 around which the band-shaped packaging material 1 is wound, that is, a roll-shaped film raw, and rotatably holds the film raw, and a holding shaft b1. It is provided with a pair of feed rollers b2 for guiding the drawn-out strip-shaped packaging material 1 to a center conveyor device c (former c2 described later), and a tension roller b3 for applying tension to the packaging material 1. Appropriate tension is applied to the packaging material 1 pulled out by the tension roller b3 to prevent loosening and backlash.
The holding shaft b1 of the film raw device b corresponds to a “holding part” in the claims.

In this example, the holding shaft b1 does not rotate, but rotates when the packaging material 1 is pulled by the center device d (a center driving roller d1 described later). That is, the holding shaft b1 rotates as the packaging material 1 is released from the web 10. The film source device b includes a support member that supports the end of the holding shaft b1 (not shown). The holding shaft b1 is rotatably supported by the holding member. The web 10 mounted on the holding shaft b1 rotates together with the holding shaft b1, so that the strip-shaped wrapping material 1 can be released. However, the holding shaft b1 does not rotate, and the web 10 can be rotated with respect to the holding shaft b1 to unwrap the packaging material 1.

The feed roller b2 is a follow-up roller that comes into contact with the band-shaped packaging material 1 drawn from the web 10 of the holding shaft b1 and rotates following the movement of the packaging material 1.
In the illustrated example, only one pair of the feed rollers b2 is provided. However, two or more pairs of the feed rollers b2 may be disposed between the web and the former c2.
In this example, the film raw device b is disposed below the center conveyor device c. That is, the apparatus for manufacturing a package shown in FIG. 3 includes a forward pillow packaging machine (FIG. 6). However, the apparatus for manufacturing a package of the present invention may include an inverted pillow packaging machine (FIG. 7A).
In the example shown in FIG. 3, the web 10 is wound with the bubble k side of the packaging material 1 inside.

(Center conveyor device c)
The center conveyor device c includes a belt conveyor c1 for transporting the articles to be packaged 1 transported by the supply conveyor device a on a belt-shaped wrapping material and further transporting them, a former c2, and a position sensor (not shown). Is provided.
3A and 3B, the belt conveyor c1 of the center conveyor device c is installed on the right side of the belt conveyor a1 of the supply conveyor device a, that is, downstream of the belt conveyor a1 of the supply conveyor device a. The article to be packaged p received from the belt conveyor a1 of the conveyor device a is placed on the strip-shaped packaging material 1 and transported from left to right together with the packaging material 1. As the belt conveyor c1 of the center conveyor device c, a known one that circulates a conveyor belt can be adopted. In addition, if the above-mentioned transfer of the article to be packaged p is possible, the center conveyor device c can be implemented as having a known conveyor other than the belt conveyor c1.

As shown in FIGS. 4 (A), 5 (A), and 6, the former c2 is the rear side of the belt conveyor c1, that is, the upstream side in the transport direction, with the transport direction of the belt conveyor c1 of the center conveyor device c as the front-back direction. Placed in The former c2 is provided between a pair of side plates c21 having a substantially triangular shape in a side view and projecting upward from the left and right (of FIG. 4A) of the belt conveyor c1 having the above-described transport direction as the front-rear direction and the lower ends of both side plates c21. There is provided a bottom plate c22 which is formed integrally with the both side plates c21 and a guide plate c23 which is formed integrally with the bottom plate c22 and extends obliquely downward from the upstream end of the belt conveyor c1 to below the belt conveyor c1. The side plate c21 has an inclined side c24 that gradually increases from the upstream side to the downstream side of the belt conveyor c1. That is, each of the side plates c21 is disposed so that the inclined side c24 is directed to the upstream side of the belt conveyor c1.
The side plates c21 stand up from the bottom plate c22 so as to increase the interval between them as going upward from below (FIG. 4A). The two side plates c21 are provided obliquely so that the direction orthogonal to each of the transport direction and the vertical direction of the packaged object p of the belt conveyor c1 is the left-right direction, and the space between the side plates c21 expands from below to above. It is.
Each side plate c21 is not limited to a triangular shape as long as it has the inclined side c24, and may have a trapezoidal shape or another shape.

The guide plate c23 sequentially guides the band-shaped wrapping material 1 pulled out from the raw film device b by the center device d (a center drive roller d1 described later) toward the center device d.
That is, on the plate surface of the guide plate c23, the band-shaped packaging material 1 drawn out from below the belt conveyor c1 of the center conveyor device c toward the downstream end of the belt conveyor c1 is laid.
The packaging material 1 along the guide plate c23 passes between (the downstream end of) the belt conveyor a1 of the supply conveyor device a and (the upstream end of) the belt conveyor c1 of the center conveyor device c. It goes to the upper surface side of the belt conveyor c1, that is, the transfer surface side. On the upper surface side of the belt conveyor c1 of the center conveyor device c, the bubble k side of the packaging material 1 is directed upward.
The bottom plate c22 of the former c2 is disposed between the belt conveyor a1 (downstream end) of the supply conveyor device a and the belt conveyor c1 (upstream end) of the center conveyor device c, and one of the plate surfaces (inner surface). Is turned upward (FIG. 3B).

The strip-shaped wrapping material 1 is drawn out (to a center drive roller d1 described later) with the longitudinal direction of the wrapping material 1 as a transport direction, turned from the guide plate c23 to the bottom plate c22, and passes between the pair of side plates c21. The width of the packaging material 1 is larger than the width of the bottom plate c22 of the former c2, that is, the width between the lower ends of the both side plates c21, where the direction orthogonal to the longitudinal direction (feeding direction) of the packaging material 1 is defined as the width direction of the packaging material 1. . In other words, the width between the lower ends of both side plates c21 of the former c2 is smaller than the above width of the packaging material 1.
For this reason, when passing through the side plate c21, it comes into contact with the inclined side c24 of the both side plate c21 and is guided by the inner side surface of the both side plate c21 (the opposing surface between the both side plates c21), so that both ends in the width direction of the packaging material 1 are the bottom plate c22. And is bent so that both ends in the width direction are directed upward (FIG. 4A). 1 (A) and 1 (B) show the protruding portions on both sides in the width direction of the packaging material 1 protruding from the packaged object p, and the protruding portions h are protruded from the bottom plate c22. This is the part that is bent upward.
When the protruding portion h is bent upward, the surface on the bubble k side of the packaging material 1 faces the inside of the bent packaging material 1.
Between the pair of side plates c21, the articles to be packaged p carried by the supply conveyor device a are sequentially placed on the portion located on the bottom plate c22 of the packaging material 1 (FIGS. 3A and 4B and FIG. 4). (A)).
That is, as both ends in the width direction of the packaging material 1 are bent by the side plate c21 of the former c2, the articles to be packaged p are sequentially arranged on the packaging material 1 by the supply conveyor device a. With the arrangement of the packages p, the wrapping of the packages p in the state shown in FIG. 1B is started.

(Center device d)
The center device d is disposed above the center conveyor device c, and includes a pair of center drive rollers d1, a pair of center seal rollers d2, and a height adjusting mechanism d3 (FIGS. 4A and 4B). ).
Each of the pair of center drive rollers d1 is a roller that turns the rotation axis d11 vertically, that is, makes the rotation axis d11 vertical.
Each of the pair of center seal rollers d2 is also a roller that turns the rotation axis d21 up and down, that is, makes the rotation axis d21 vertical.
The center device d includes a first drive unit d12 for rotating the center drive roller d1, and a second drive unit d22 for rotating the center seal roller d2. A well-known motor such as a servomotor can be used for the first drive unit d12 and the second drive unit d22. In this example, each of a first drive unit d12 provided with a pair of center drive rollers d1 and a second drive unit d22 provided with a pair of center seal rollers d2 is attached to a holder d4 (FIG. 4 (B)).
The center drive roller d1 and the center seal roller d2 are not limited to those driven by separate drive units. The center drive roller d1 and the center seal roller d1 are connected to the center seal roller d1 by a power transmission means such as a gear. The roller d2 may be driven.

The holder d4 is supported by a support (not shown).
The support is a frame that supports the holder d4 so as to be able to move up and down with respect to the support.
The vertical position of the holder d4 with respect to the support can be adjusted by the height adjustment mechanism d3. In this example, the height adjustment mechanism d3 includes a height adjustment handle d31 and an operating shaft d5 that is rotated by operating the height adjustment handle d31 (FIG. 3B). The operating shaft d5 can penetrate the support and rotate with respect to the support. However, the vertical movement of the operating shaft d5 with respect to the support body is restricted by attaching the pierced rear stopper member d51. As the retaining member d51, an annular or cylindrical member having an outer diameter larger than the inner diameter of the hole through which the operating shaft d5 of the support passes can be adopted. After the retaining member d51 is attached to the outer periphery of the operation shaft d5, it may be fixed to the operation shaft d5 with a fixing tool such as a screw. In addition, a female screw is formed on the inner peripheral surface of the retaining member d51, and a male screw is formed on the outer peripheral surface of the operating shaft d5. The retaining member d51 may be fixed.

Further, the operating shaft d5 has a male screw different from the male screw, and is screwed into a screw hole (female screw) provided in the holding body d4 (not shown).
The holding body d4 has a contact portion (not shown) that comes into contact with the support, and the holding portion d4 does not rotate with respect to the support due to the contact of the contact portion. The operation of the height adjustment handle d31 causes the operation shaft d5 to rotate with respect to both the support and the holding portion d4. Due to the rotation of the operation shaft d5, the holder d4 moves up and down with respect to the operation shaft d5. In this way, the holding member d4 is moved up and down with respect to the support by the rotation of the operation shaft d5, and the center drive roller d1 and the center seal roller d2 are moved up and down with respect to the transfer surface (upper surface) of the belt conveyor c1 of the center conveyor device c. Can be adjusted.

The pair of center driving rollers d1 rotate while sandwiching the packaging material 1 between the outer peripheral surfaces thereof, thereby sequentially pulling out the packaging material 1 from the web 10 of the raw material device b (holding shaft b1) and rotating the packaging material 1. The insides of both ends in the width direction are overlapped, that is, they are put together. That is, both ends in the width direction of the packaging material 1 bent by the side plate c21 of the former c2 are sandwiched by the center drive roller d1 as described above, and are overlapped in a palm-to-hand state.

In this example, the center device d is provided with a palm adjustment member d6 to appropriately overlap both ends in the width direction of the packaging material 1 in particular (FIGS. 3B and 4A). The joint adjustment member d6 is a plate-shaped member made of plastic.
The joint adjustment member d6 interrupts between the both ends in the width direction of the packaging material 1 in the section of the packaging material 1 after passing through the former c2 but before reaching the center driving roller d1, and the packaging material 1 is driven in the center. The two ends of the packaging material 1 are prevented from immediately overlapping each other by being drawn to the roller d1, and the two ends of the packaging material 1 before reaching the center drive roller d1 are trimmed.

The above-mentioned joint adjustment member d6 will be described in detail.
The joint adjustment member d6 is a plate-shaped member arranged on the holding body d4 on the upstream side (left side in FIG. 3) of the transport direction with respect to the center drive roller d1. As shown in FIGS. 4A and 4C, the lower end side of the joint adjustment member d6 has an inverted triangular shape that tapers downward in a front view of the packaging device. That is, the lower left and right sides of the palm adjustment member d6 are provided with oblique sides d61 cut obliquely.
This prevents each side of the packaging material 1 from contacting each of the oblique sides d61 in the width direction, thereby preventing a situation in which the both ends are rolled into a cylindrical shape and do not properly join hands.

More specifically, the joint adjustment member d6 is disposed between the former c2 of the band-shaped packaging material 1 and the center drive roller d1, and each of the both ends in the width direction of the packaging material 1 is left and right of the inverted triangle. By contacting each of the two sides, the packaging materials 1 can be appropriately overlapped in a state where both ends in the width direction are elongated. In particular, the joint adjustment member d6 is effective for appropriately overlapping the surfaces of the bubble cushioning material 2 on the bubble k side. In detail, the palm adjustment member d6 is interposed between both ends in the width direction of the packaging material 1 above the article to be packaged p until it is superimposed on the palm by the center drive roller d1, and the hypotenuse d61 extends in both ends. Guide you. With this guide, both ends in the width direction of the packaging material 1 are not overlapped with each other right near the center drive roller d2, and it is possible to suppress the occurrence of a situation in which the both ends of the packaging material 1 are curled and do not properly form a joint.
The lower part of the joint adjustment member d6 may be provided with the oblique sides d61 on the left and right so as to taper downward, and the joint adjustment member d6 is not limited to the member having the inverted triangle shape. For example, the lower end side of the palm adjustment member d6 may have a shape of a trapezoid with a bottom side smaller than an upper side (not shown).

The joint adjustment member d6 is variably attached up and down with respect to the holding plate d4 so that the height can be adjusted.
For example, the front surface of the holding member d4 (the surface facing the upstream side in the transport direction of the belt conveyor c1) includes an attachment portion d41 that protrudes forward (upstream in the transport direction of the belt conveyor c1). An attachment d42 such as a bolt is attached to the part d41 (FIGS. 3B and 5A). The mounting tool d42 is vertically pierced or screwed into the mounting section d41, and its tip protrudes downward from the mounting section d41. The leading end of the attachment d42 is screwed into the upper end surface of the plate-shaped joint adjustment member d6, thereby fixing the joint adjustment member d6 to the attachment portion d41.
However, if the wrapped material p having the same height is exclusively used, the above-described height adjustment cannot be performed, that is, the height can not be displaced.

By adjusting the screwing width of the joint adjustment member d6, the position of the joint adjustment member d6, that is, the vertical position of the oblique side d61 can be adjusted. D43 in FIG. 5A indicates the head of the fixture d42. The head part d43 is hooked on the attachment part d41 as a stopper. The head d42 is also a tool engaging portion that engages a tool such as a wrench when screwing or unscrewing the attachment d42. In addition, d62 in FIG. 5A indicates a hole of the joint adjustment member d6 into which the distal end side of the attachment d42 is screwed.
The adjustment of the upper and lower positions of the joint adjustment member d6 may be performed by adjusting the screwing width of the attachment d42 to the attachment adjustment member d6 or by adjusting the screwing position of the attachment d42 to the attachment portion d41. Good.

The attachment of the palm adjustment member d6 is not limited to the above-described means shown in FIGS. 4A and 5B and FIG. 5A. The present invention can also be implemented as provided on the holder d4. For example, as shown in FIGS. 5B and 5C, the mounting portion d41 of the holding portion d4 is a portion formed in a plate shape extending vertically, and the plate-shaped joint adjustment member d6 penetrates back and forth and extends vertically. The notch or the elongated hole is formed as a through portion d63 through which the fixture d42 passes. The joint adjustment member d6 is fixed to the mounting portion d41 by passing the mounting tool d42 through the through portion d63 and the mounting portion d41. As shown in FIG. 5 (C), the mounting tool d42 may be a bolt, and a nut may be mounted on the end of the mounting tool d42 that is exposed through the through portion d63 and the mounting portion d41. The attachment d42 may be directly screwed.
In the case where it is not necessary to change the upper and lower positions of the joint adjustment member d6, the through portion d62 does not need to be a cutout or a long hole extending up and down, but is simply a round hole penetrating the mounting portion d41 back and forth. Can also be implemented.

As described above, the joint adjustment member d6 only needs to taper the lower end side downward, and as a whole, has a pentagonal shape (FIGS. 4 (A), (C) and 5 (A)) or an arrow pointing downward. One that presents (FIG. 5B) can be exemplified.
If there is no danger of the joint being disturbed due to the dimensions of the packaging material 1 and the packaged object p, the thickness of the packaging material 1 and the properties of the polyethylene constituting the packaging material 1, the operation is performed without providing the joint adjustment member d6. May be. However, when forming the joint of the pillow package with the bubble cushioning material as described above, it is preferable to provide the joint adjusting member d6.

Further, by the rotation of the pair of center drive rollers d1, the packaging material 1 is sent to the pair of center seal rollers d2 disposed downstream of the center drive roller d1 in the transfer direction (FIG. 7B).
Each of the center seal rollers d2 heats the packaging material 1 to a fusing temperature at which both ends of the packing material 1 are sandwiched by fusing. That is, the center seal roller d2 can raise the temperature to the fusion temperature at which the outer peripheral surface is fused.
In the example shown in FIGS. 1 to 6, the center drive roller d1 of the center device d corresponds to the “drawing portion” in the claims, and the center drive roller d1 of the center device d and the former c2 are claimed. And the center seal roller d2 of the center device d corresponds to the "bubble cushioning material fusion processing section" in the claims.

Specifically, the center seal roller d2 is a hollow metal tubular body, and has a heater d20 inside (hereinafter, the heater d20 is referred to as a heater d20 as necessary). The heater d20 generates heat and heats the center seal roller d2. Then, the both ends in the width direction of the packaging material 1 which are sandwiched between the pair of center seal rollers d2 and overlapped in a palm shape receive heat from the center seal roller d2 and are heat-sealed. At this time, the bubbles k of the bubble cushioning material 5 are also melted to form a part of the joint portion 6.
The heater d20 includes a heating wire that generates heat when supplied with electricity. The heater d20 corresponds to the "heater" in the claims.
As the heater d20, a heater capable of uniformly heating the outer periphery of the center seal roller d2 in the circumferential direction of the center seal roller d2 is used. Although not shown, the center device d includes a well-known temperature sensor that can detect the temperature of the outer peripheral surface of the center seal roller d2.
The temperature sensor makes it possible to know whether or not the rotation of the center seal roller d2 causes a difference in the circumferential direction of the center seal roller d2 from the temperature set on the outer peripheral surface of the center seal roller d2. When there is a difference between the set temperature and the temperature detected by the temperature sensor, the heat generation temperature of the heater d20 is adjusted. Further, by adjusting the rotation speed of the center seal roller d2 by the second drive unit d22, it is possible to form a uniform joint portion that covers the temperature difference.

Correction of the difference from the set temperature can be performed by adjusting the temperature of the heat of the center seal roller d2 by the control device that has learned the difference between the temperature sensor and the set temperature. Further, the packaging device includes an operation panel (not shown), and can display the set temperature and the temperature detected by the temperature sensor on the operation panel. The operator can set the temperature of the heater of the center seal roller d2 by operating the operation panel.
The setting and adjustment of the temperature of the heater d20 and the setting and adjustment of the rotation speed of the center seal roller d2 will be described in detail later in the description of the control device.
It is not excluded that the operator corrects the temperature difference by adjusting the temperature of the heater d20 by watching the detected temperature displayed on the operation panel instead of the control of the control device.

However, the above-mentioned packaging device according to the present invention allows the formation of the pillow package by interposing the bubble cushioning material to the joint portion, which was impossible with the conventional pillow packaging device, because the center seal roller d2 It is considered that the temperature variation in the circumferential direction was kept low.
That is, the inventor of the present invention has conducted intensive studies and, in order to form a pillow package that covers the packaged material p with the bubble cushioning material, including the joint portion, has to use both ends of the band-shaped package 1 in the width direction. It has been found that it is important that the welding temperature at which the joints are welded is constant in the longitudinal direction of the package 1.
Therefore, in the packaging device (center device d) according to the present invention, the heater d20 for heating the outer periphery of the center seal roller d2 according to the temperature control makes the temperature substantially constant in the circumferential direction of the center seal roller d2. One that can perform heating is adopted.

The inventor conducted one test in order to confirm the range of the above-mentioned variation in the heating that is allowed to be substantially constant in the circumferential direction of the center seal roller d2.
In this test, a polyethylene air cap (registered trademark) sheet provided with a plurality of bubbles k having a diameter of 10 mm and a protrusion width of 3.5 mm, which are widely used as bubble cushioning materials, and a polyethylene shrink film were used. Using the packaging material 1, the joint portion was formed without placing the article to be packaged p. Usually, the packaged object p is not pressed against the air bubbles of the air cap sheet until it is shrunk into a shrink package. Therefore, as described above, when forming the pillow package before shrinking, even if the joint part is formed empty without placing the packaged object p, the result does not differ from the case where the packaged object p is stored.

In the above test, the packaging material 1 having a width of 240 mm was fed 9 m to try to form a joint portion.
In the test, heat fusion is performed with a center seal roller d2 having a diameter of 96 mm. When the feeding speed of the packaging material 1 is 30 mm per second and the welding temperature is 130 degrees Celsius, the maximum of the center seal roller d2 in the circumferential direction is set. The temperature difference does not exceed ± 2 degrees (128 degrees Celsius or more and 132 degrees Celsius or less). By adopting the heater d20, the bubbles of the bubble cushioning material are dissolved, and both ends in the width direction of the packaging material 1 are closed. The formation of a normal fused palm portion 6 was confirmed. In this test, when the above-mentioned feeding of the packaging material 1 was performed in a state where the set temperature was 130 ° C. and the detected temperature was stable at 130 ° C., it was detected after detecting 129 ° C. for about 1 to 2 seconds. The temperature returned to 130 degrees Celsius, and thereafter the detected temperature did not change from 130 degrees Celsius (the above ± 2 degrees was considered in consideration of the fact that the display of the operation panel showing only integers was rounded off to the nearest whole number). The maximum temperature difference in this test).

After the test, when the set temperature was changed from 135 ° C. to 135 ° C. from the state of 130 ° C., the temperature sensor detected 135 ° C. after 1 minute and 45 seconds. That is, in the above test, as the packaging device of the present invention, a center device d having an ability to perform temperature correction from 130 degrees Celsius to 135 degrees Celsius in 1 minute and 45 seconds was employed.
Regarding the packaging material 1 used in the above test, the tensile strength was 9 kg / 22 mm, the tensile elongation was 110%, and the heat in the glycerin bath was 10 seconds (110 degrees Celsius, Xingjin method) in the flow direction (longitudinal direction, ie, the transport direction). A shrinkage ratio of 24%, a heat shrinkage stress of 80% by a glycerin bath (110 ° Celsius method), a tensile strength of 7 kg / 22 mm, a tensile elongation of 150%, and a glycerin in a direction (width direction) perpendicular to the flow direction. The heat shrinkage was 27% in a 10 second bath (110 ° Celsius method) and the heat shrinkage stress was 60% in a glycerin bath (110 ° Celsius method). What was set to 0.5 kg / 15 mm was adopted.
In this example, the packaging material 1 is of the type shown in FIG. 1 having both the heat shrinkable film 5 and the closing film 4. The diameter of the bubble k when the developed packaging material 1 is viewed in plan is 10 mm, and the protruding height (grain height) is 3.5 mm.
As the above-mentioned packaging material 1, a brand d40 shrink 2F (002896) of Kawakami Sangyo Co., Ltd. (4-6F, Homat Horizon Building, Gobancho, Chiyoda-ku, Tokyo) can be used.

Naturally, the above-mentioned test conditions do not define the practicable range of the present invention. In carrying out the test, the above-mentioned feed rate and the size of the bubble of the bubble cushioning material can be changed.
The set temperature of the heater is different depending on the use environment and the type of the packaging material 1, and it is impossible to test all of them. As long as the joint portion 1 can be formed under the above test conditions, an appropriate gas joint material can be used with a bubble cushioning material in accordance with the change of the set temperature according to the material and dimensions of various packaging materials 1 under normal temperature and no wind environment. It is considered that a part can be formed.
Of course, it is preferable that the temperature variation of the center seal roller d2 is set to a narrower range. For example, according to the above test example, when the set temperature of the outer peripheral surface of the center seal roller d2, which is the heat generating portion, is 130 degrees Celsius, the maximum temperature difference in the circumferential direction of the outer peripheral surface of the center seal roller d2 is ± 1 degree. It is more preferable to employ a heater having an ability to keep the temperature within a range not exceeding 129 degrees Celsius (131 degrees Celsius or less).
Note that each of the pair of center seal rollers d2 may have the same heat-generating temperature, but may be any as long as the both ends in the width direction of the packaging material 1 forming the joint portion 6 can be fused together. One of the center seal rollers d2 and the other may have different temperatures at which heat is generated. That is, one center seal roller d2 is maintained at the above-mentioned fusion temperature or a constant temperature higher than the fusion temperature, and the temperature at which the other one of the center seal rollers d2 generates heat is lower than that of the above-mentioned one center seal roller d2. It can also be implemented as maintaining a constant temperature.

Each of the center drive rollers d1 can also raise the temperature of the peripheral surface of the package, and heats the both ends of the wrapping material 1 at a temperature lower than the fusion temperature prior to heat fusion by the center seal roller d2. It is preferable to ensure that the fusion temperature of the packaging material 1 reaches the fusion temperature and to more reliably form the joint portion of the pillow package using the bubble cushioning material.
Specifically, the center drive roller d1 is also a hollow metal cylindrical body, and has a heater d10 therein (hereinafter, the heater d10 is referred to as a preheater d20 as necessary). It is assumed that the preheater d10 generates heat and heats the center drive roller d1. Heat is applied from the center drive roller d1 to both ends in the width direction of the packaging material 1 that are overlapped in a palm shape and sandwiched between a pair of center drive rollers d1, and are heated to a temperature that does not fuse before heat fusion. It is.
For example, assuming that each of the center seal rollers d2 is maintained at 130 degrees Celsius in accordance with the above test example, it is preferable to heat each of the center drive rollers d1 to 40 to 50 degrees Celsius.
However, in the case where it is not necessary to preheat the packaging material 1 before the heat sealing by the center seal roller d2, the center drive roller d1 can be implemented without being heated.

(Unloading conveyor device f)
The unloading conveyor device f includes a belt conveyor f1. 3A and 3B, the belt conveyor f1 of the unloading conveyor device f is installed on the right side of the belt conveyor c1 of the center conveyor device c, that is, downstream of the belt conveyor c1 of the center conveyor device a. The packaged product p received from the belt conveyor c1 of the device c, that is, the packaged product p packaged as a pillow package in the center device d, is transported together with the packaging material 1 from left to right. As the belt conveyor c1 of the center conveyor device c, a known one that circulates a conveyor belt can be adopted. In addition, as long as the above-mentioned transfer of the articles to be packaged p packed as a pillow package can be performed, the unloading conveyor device c can be implemented as having a known conveyor other than the belt conveyor c1.
As shown in FIGS. 3A and 3B, the unloading conveyor device f transfers the pillow package received from the center conveyor c to the shrink device g.

(Top and tail seal device e)
The top-tail sealing device e is provided between the belt conveyor f1 of the unloading conveyor device f and the belt conveyor c1 of the center conveyor device c, for the band-shaped packaging material 1 in which the joint portion is formed, with respect to the package 100. The front and rear positions of the unit to be packed p are sealed and cut to form a pillow package.
The top / tail sealing device e corresponds to a “seal processing unit” and a “cutting unit” in the claims.

The top / tail seal device e includes an upper operation unit e1 disposed above the belt conveyor c1 of the center conveyor device c, and a lower operation unit e2 disposed below the belt conveyor c1.
The upper operation unit e1 includes a blade e11, a frame e10 that accommodates the blade e11 so as to be vertically displaceable, a top seal holder e12 provided on the frame e10, and a tail seal holder e13 provided on the frame e10. . In the frame e10, the top seal holder e12 is located on the upstream side of the blade e11 in the transport direction of the belt conveyor c1 of the center conveyor device c, and the tail seal holder e13 is located on the downstream side in the transport direction.
Hereinafter, the frame e10 of the upper operation part e1 will be referred to as an upper frame e10, the top seal holder e12 as an upper top seal holder e12, and the tail seal holder e13 as an upper tail seal holder e13 as necessary.

The gap between the upper top seal holder e12 and the upper tail seal holder e13 constitutes an accommodating portion for the blade e11. The blade e11 is attached to the upper frame e10 so that the blade edge can protrude and retract from between the upper top seal holder e12 and the upper tail seal holder e13.
Each of the upper top seal holder e12 and the upper tail seal holder e13 is a sealer that heat seals the packaging material 1. Each of the front end surfaces (lower end surfaces) of the upper top seal holder e12 and the upper tail seal holder e13 is a heat generating portion that generates heat for the heat sealing.
The upper frame e10 extends along the width direction of the belt-shaped packaging material 1 to be transferred (FIGS. 6A to 6D), and includes the cutting edge of the blade e11, the upper top seal holder e12, and the upper tail seal holder. Each of e13 extends along the width direction.

The lower operation part e2 includes a frame e20, a top seal holder e22 provided on the frame e20, and a tail seal holder e23 provided on the frame e20. In the frame e20, the top seal holder e22 is located upstream of the tail seal holder e23 in the transport direction of the belt conveyor c1 of the center conveyor device c.
A gap is provided between the top seal holder e22 and the tail seal holder e23 of the lower operating section e2, and the gap forms a receiving section e21 that receives the cutting edge of the blade e11 of the upper operating section e1.
Hereinafter, the frame e20 of the lower operation part e2 is called a lower frame e20, the top seal holder e22 is called a lower top seal holder e22, and the tail seal holder e23 is called a lower tail seal holder e23 as needed.

Each of the lower top seal holder e22 and the lower tail seal holder e23 is a sealer for heat-sealing the packaging material 1. Each of the front end surfaces (lower end surfaces) of the lower top seal holder e22 and the lower tail seal holder e23 generates heat due to the heat sealing.
The lower frame e20 extends in the width direction of the belt-shaped packaging material 1 to be transferred (FIGS. 6A to 6D), and has a receiving portion e21, a lower top seal holder e22, and a lower tail seal holder e23. Also extend along the width direction.

The upper frame e10 moves downward (upstream upper separation position t1 in the transfer direction of FIG. 5D) from below (upper sandwiching position t2), and simultaneously the lower frame e20 moves downward (upstream lower separation position t5) from above (downward). It moves to the sandwiching position t6), and the preceding package to be transferred from the belt conveyor c1 of the center conveyor device c to the belt conveyor f1 of the unloading conveyor device f (FIGS. 3A, 3B and 5D). The packaging material 1 is sandwiched between p and a subsequent packaged object p before transfer, that is, between the upper and lower sandwiching positions t2 and t6 in FIG. 5D. After sandwiching the packaging material 1, the upper frame e10 moves upward (downstream upper separation position t3), returns to the original position (upstream upper separation position t1) again via the uppermost position t4, and the lower frame e20 moves downward. It moves to (downstream lower separation position t7) and returns to the original position (upstream lower separation position t5) again via the lowermost position t8.

The above operation of the upper frame e10 and the lower frame e20 will be specifically described.
The upstream-side upper separation position t1 is a retreat position on the upstream side in the transport direction of the packaged object p from the upper sandwiching position t2 and at an interval above the packaged object p. The downstream upper separation position t3 is a retreat position on the downstream side in the transport direction above the upper sandwiching position t2 and at an interval above the packaged object p (pillow package). The uppermost position t4 is a retreat position located between the upstream upper separation position t1 and the downstream upper separation position t3 and higher than the upstream upper separation position t1 and the downstream upper separation position t3.
The upstream lower separation position t5 is a retreat position on the upstream side in the transport direction of the packaged object p from the lower sandwiching position t6 and spaced downward from the packaged object p. The downstream lower separation position t7 is a retreat position on the downstream side in the transport direction from the lower upper sandwiching position t6 and spaced downward from the packaged object p (pillow package). The lowermost position t8 is a retreat position between the upstream lower separating position t5 and the downstream lower upper separating position t7, which is lower than the upstream lower separating position t5 and the downstream lower separating position t7.

As shown in FIG. 5D, the upper frame e10 moves from the upstream upper separation position t1 to the upper sandwiching position t2, the downstream upper separation position t3, and the uppermost position t4. Further, the lower frame e20 also moves from the upstream lower separation position t5 to a lower sandwiching position t6, a downstream lower separation position t7, and a lowermost position t8.
In this example, the upper frame e10 moves by drawing a rectangle having the above-described positions t1 to t4 as vertices (performing a box motion), and the lower frame e20 draws a rectangle having the above positions t5 to t8 as vertices. To move (box motion).
The movement speed of the upper frame e10 from the upstream upper separation position t1 to the upper sandwiching position t2 and the horizontal movement speed of the lower frame e20 from the upstream lower separation position t5 to the lower sandwiching position t6 are both the belts of the center conveyor device c. It is equal to the horizontal moving speed of the transfer surface of the conveyor c1.
Both the movement of the upper frame e10 from the upper holding position t2 to the downstream upper separation position t3 and the movement of the lower frame e20 from the lower holding position t6 to the downstream lower separation position t7 in the horizontal direction are the same as those of the belt of the carry-out conveyor device f. It is equal to the horizontal moving speed of the transfer surface of the conveyor f1.

When the upper and lower frames e10 and e20 are located at the upper and lower sandwiching positions t2 and t6, the lower end surface of the upper top seal holder e12 and the upper end surface of the lower top seal holder e22 face each other with the packaging material 1 interposed therebetween. The lower end surface of the upper tail seal holder e13 and the upper end surface of the lower tail seal holder e23 face each other with the packaging material 1 interposed therebetween. In the packaging material 1, the portion sandwiched between the lower end surface of the upper top seal holder e12 and the upper end surface of the lower top seal holder e22, and the lower end surface of the upper tail seal holder e13 and the upper end surface of the lower tail seal holder e23 are vertically The top seal holders e12 and e22 are heat-sealed by the heat generated by the top end faces (upper and lower end faces) of the upper and lower tail seal holders e13 and e23.
That is, in the packaging material 1, the portion sandwiched between the lower end surface of the upper tail seal holder e13 and the upper end surface of the lower tail seal holder e23 is a tail seal (rear end seal 7b) facing the upstream side in the transport direction of the packaged object p. Become. In the packaging material 1, a portion sandwiched between the lower end surface of the upper top seal holder e12 and the upper end surface of the lower top seal holder e22 is a top seal (front end seal 7a) facing the downstream side in the transfer direction for another packaged object p. ) (FIG. 2).

More specifically, in the packaging material 1, the portions heat-sealed at the tip surfaces (upper and lower end surfaces) of the upper and lower tail seal holders e13 and e23 are seals at the upstream end in the transport direction of the preceding packaged object p in the packaging material 1. That is, the rear end side seal 7b is formed, and the portion heat-sealed at the front end surfaces (upper and lower end surfaces) of the upper and lower top seal holders e12 and e22 is a seal at the downstream end of the packaging material 1 in the transfer direction of the subsequent packaged object p. That is, it becomes the tip side seal 7a. In the above-described processing by the top / tail seal device e, the preceding packaged object p is the packaged product p immediately adjacent to the belt conveyor c1 of the center conveyor device c that has already transferred to the belt conveyor f1 on the unloading conveyor device f side as described above. The subsequent packaged object p refers to the packaged object on the belt conveyor c1 of the center conveyor device c which has not yet been transferred to the belt conveyor f1 of the unloading conveyor device f immediately following the transport direction of the preceding packaged object p. p (FIGS. 3A and 3B).

When the upper and lower frames e10 and e20 are located at positions t2 and t6 sandwiching the packaging material 1 due to the heat sealing, the upper operation unit e1 is moved to the lower end surface of the upper top seal holder e12 and the lower end surface of the upper tail seal holder e13. The blade e11 is protruded downward from between (FIG. 5B).
The blade edge of the protruding blade e1 is inserted into the receiving portion e21 between the lower top seal holder e22 and the lower tail seal holder e23. By the downward projection of the blade e1, between the tail seal on the preceding packaged object p side which has moved onto the belt conveyor f1 of the unloading conveyor device f and the top seal on the subsequent packaged object p side. To cut the packaging material 1.
By this cutting, the packaging material 1 for packaging the preceding packaged product p and the packaging material 1 for packaging the subsequent packaged product p are separated, and the packaging of the preceding packaged product p as a pillow package is completed. (FIG. 2 (A)).
The cutting is to cut off the packaging material 1 for each packaged object p for packaging the packaging body 1 at the seal portion 7 (FIG. 2). However, the packaged object p can also be implemented as a single package 1 with a plurality of units as one unit.

By synchronizing the speed of the horizontal component of the movement of the upper frame e10 and the lower frame e20 with the speed of the horizontal component of the movement of the packaging material 1 and the packaged object p as described above, the formation of the tail seal and the top seal and the cutting tool The packaging material 1 can be cut smoothly by e1.
As shown in FIGS. 6 (A) to 6 (D), the upper and lower frames e10 and e20 repeat the above box motion to sequentially wrap the articles to be packaged p and sequentially form pillow packages.
Although not shown, the upper and lower operation units e1 and e2 guide the movement of the upper frame e10 and the lower frame e20, and cause the upper frame e10 and the lower frame e20 to perform the box motion. Is provided.
The upper and lower operation units e1 and e2 synchronize the box motions of the upper frame e10 and the lower frame e20. In addition, as long as smooth heat sealing and cutting of the packaging material 1 can be performed, the upper and lower frames e10 and e20 may be moved by drawing a triangle without passing through the uppermost position t3 or the lowermost position t7. Good.
The upper and lower operation units e1 and e2 move the upper frame e10 so as to draw a circle using the positions t1 to t4 as positions on the circumference instead of the box motion, and move the positions t5 to t8 around the circumference. It is also possible to employ a rotary type upper and lower operation unit e1, e2 that moves the lower frame e20 so as to draw a circle as the upper position.

The tail seal (the rear end seal 7b) and the top seal (the front end seal 7a) are formed by the upper and lower tail seal holders e13 and e23 and the upper and lower top seal holders e12 and e22. The inside (on the side where bubbles k are formed) of one strip-shaped packaging material 1 vertically stacked between the objects to be packaged p is formed by heat fusion.
That is, the heating portions of the upper and lower tail seal holders e13 and e23 and the upper and lower top seal holders e12 and e22 are similar to the respective center seal rollers d2 of the center device d forming the joint portion 6 (FIG. 2A). It is desirable that the heat generated in the horizontal direction of the upper and lower tail seal holders e13 and e23 and the upper and lower top seal holders e12 and e22 extending in the width direction of the band-shaped packaging material 1 be substantially constant. However, as compared with the formation of the joint portion 6 in which the packaging material 1 is successively sandwiched by the heat-generating portions and heat-sealed along the transporting direction along with the transport of the packaging material 1, the sealing of the packaging material 1 at one time in the width direction is performed. In the formation of the tail seal and the top seal which perform the heat fusion with the entire portion to be sandwiched therebetween, the problem of the occurrence of temperature variation of the heat generating portion is less likely to occur as the formation of the joint portion.

In addition, the heat generation temperature of the upper tail seal holder e13 and the lower tail seal holder e23 may be the same, but one of the upper tail seal holder e13 and the lower tail seal holder e23 as long as appropriate fusion can be performed. May be lower than the other one. For example, the present invention can be implemented in such a manner that only one of the upper tail seal holder e13 and the lower tail seal holder e23 generates heat at or above the melting temperature of the bubble cushioning material, and the other one is lower than the melting temperature.
Similarly to the above, the heating temperature of the upper top seal holder e12 and the lower top seal holder e22 may be the same, or the upper top seal holder e12 and the lower top seal holder e22 as long as appropriate fusion can be performed. However, one heat generation temperature may be lower than the other heat generation temperature. Only one of the upper top seal holder e12 and the lower top seal holder e22 may generate heat at or above the melting temperature of the bubble buffer, and the other may be lower than the melting temperature.

(Shrink device)
The shrink device g forms a hot air tunnel that blows hot air to the passing package 100.
The hot air preferably has a temperature of 130 to 150 degrees Celsius.
The shrink device g corresponds to a “heating unit” in the claims.
More specifically, the shrink device g includes a transport conveyor g1, a hot air heater g2, and a housing g3 (FIGS. 3A and 3B).
The transport conveyor g1 is a chain conveyor, and is a ladder-shaped conveyor in which a plurality of metal rods are passed between a pair of circulating chains. The transport conveyor g1 receives the pillow package transported by the belt conveyor f1 of the unloading conveyor device f, and moves the inside of the housing g3.

The hot air heater g2 is provided inside the housing g3.
The hot air heater g2 blows the hot air onto the pillow package moving on the conveyor g1 in the housing g3 to shrink the heat shrinkable film 5 of the packaging material 1. The pillow package is made into a shrink package by shrinkage of the heat-shrinkable film 5, that is, by shrink (FIG. 2B).
After the above shrink by the hot air heater g2, the package 1 which has been made into a shrink package is carried out of the housing g3 by the transport conveyor g1.

More specifically, in the housing g3, the hot-air heaters g2 are provided above and below the transport conveyor g1 and further to the left and right of the transport conveyor g1 with the transport direction being the front-back direction.
The hot air heater g2 is a metal pipe through which hot air passes in this example. The hot-air heaters g2 extend in a 99-fold form along the transport direction of the transport conveyor g1 (FIG. 3C). On the outer peripheral surface of the hot air heater g2, a plurality of hot air outlets are provided along the longitudinal direction of the hot air heater g2.
Further, the form of the hot air heater g2 and the arrangement of the outlets shown in FIG. 3C are merely examples, and other forms capable of shrinking can be employed. For example, the hot air heater g2 is not limited to a pipe and may be formed as a case. What is necessary is just to make several said blow-out holes distribute on the surface which faces the conveyance conveyor g1 of the said case.

(Control device)
The control device includes a transfer speed control unit, a seal operation control unit, a center temperature control unit, a center operation control unit, and a seal temperature control unit (not shown).
The control device includes a computer and control software installed in the computer.
In this example, the moving speed control unit controls the drive unit (motor) of the belt conveyor c1 based on the position information of the article p on the belt conveyor c1 of the center conveyor device c detected by the position sensor. The transfer speed of the belt conveyor c1 of the center conveyor device c with respect to the transfer speed of the belt conveyor a1 of the supply conveyor device a, or the transfer speed of the belt conveyor a1 of the supply conveyor device a relative to the transfer speed of the belt conveyor c1 of the center conveyor device c. As appropriate, adjust the spacing between the preceding package p and the subsequent package p. By the adjustment, a top seal and a tail seal can be performed at positions before and after the packaged object p in the packaging material 1, and an appropriate space between the preceding packaged item p and the subsequent packaged item p is secured. I do. In addition to the adjustment of the interval, the operation speed of the top / tail seal device e may be controlled by the seal operation control unit to more reliably perform the top seal and the tail seal.
However, when the size of the packaged object p is constant, the transfer speed control unit may operate the belt conveyor c1 of the center conveyor device c at a transfer speed set by the operator.
The sealing operation control unit controls the upper frame e10 and the lower frame e20 by the upper operation unit e1 and the lower operation unit e2 of the top / tail sealing device e in accordance with the transfer speed of the packaged object p controlled by the transfer speed control unit. To work.
Regardless of whether the size of the packaged object p is constant or not, the packaged product p is sequentially and manually placed on the belt conveyor a1 of the supply conveyor device a at an appropriate interval, and the transfer speed is determined. The present invention can also be implemented without adjusting the transfer speed by the control unit.

In particular, when the size of the packaged object p to be packed is constant, it can be dealt with by detecting the downstream position of the packaged object p in the transport direction by the position sensor (not shown). On the other hand, when the size of the packaged object p is different from the size of the packaged product p preceding the packaged product p following the packaged product p, it is necessary to detect the position of the packaged product p before and after in the transport direction to control the transport speed. Yes, in addition to the above-mentioned position sensor for detecting the downstream end (front end) of the packaged object p, a sub-position sensor for detecting the upstream side end (rear end) of the packaged object p, and if necessary, the packaged object p And a height sensor for detecting the height of the object.
As the position sensor, the auxiliary position sensor, and the height sensor, a known optical sensor including a light emitting unit that emits infrared light or other light and a light receiving unit that receives the light emitting unit can be used. As the optical sensor, a sensor that detects the light emitted from the light emitting unit by the light receiving unit to detect the position of the packaged object p may be employed. May be employed in which the light receiving unit detects the light reflected by the light source and detects the position of the article to be packaged p.
For the position sensor, sub-position sensor, and height sensor, physical sensors such as pressure-sensitive sensors that detect the position of the packaged object p by detecting contact with or no contact with the packaged item ps are used. Alternatively, a sound wave sensor that emits sound waves and receives reflected sound waves to detect the position of the packaged object p may be employed.

The center temperature control section causes the heater d20 of the center seal roller d2 to generate heat to the temperature set by the input of the worker, and the temperature sensor provided on the center seal roller d2 detects the outer peripheral surface of the center seal roller d2. Detect temperature. If the temperature detected by the temperature sensor does not match the temperature set above, the center temperature control unit raises and lowers the heat generation temperature of the heat generation heater d20 to increase the temperature of the outer peripheral surface of the center seal roller d2 to the set temperature. Adjust so that it matches.
When the center drive roller d1 is also a person who gives residual heat to the packaging material 1 by the residual heat heater d10, the residual heat heater d10 of the center drive roller d1 is heated to the temperature set by the input of the worker, and the center drive roller d1 is heated. The temperature of the outer peripheral surface of the center drive roller d1 is detected by the provided temperature sensor. If the temperature detected by the temperature sensor of the center drive roller d1 does not match the temperature set above, the center temperature control unit raises and lowers the heat generation temperature of the residual heat heater d10 to increase the temperature of the outer peripheral surface of the center drive roller d1. Is adjusted so as to match the set temperature.
The center operation control unit rotates the center drive roller d1 and the center seal roller d2 at a rotation speed set by an operator. The center operation control unit may control the rotation speed according to the temperature detected by the temperature sensor of the center drive roller d1 such that the set temperature matches the detected temperature.
Further, the transfer speed control unit may adjust the transfer speed of the belt conveyor c1 of the center conveyor device c in accordance with the rotation speeds of the center drive roller d1 and the center seal roller d2 controlled by the center operation control unit.

The top / tail seal device e includes a seal temperature sensor that detects the heat generation temperature of the upper and lower top seal holders e12 and e22 and the upper and lower tail seal holders e13 and e23.
The seal temperature control unit heats the upper and lower top seal holders e12 and e22 and the upper and lower tail seal holders e13 and e23 at a temperature set by an operator's input, and the upper and lower top seals are detected by the seal temperature sensor. The temperature of the holders e12 and e22 and the upper and lower tail seal holders e13 and e23 is detected. If the temperature detected by the seal temperature sensor does not match the temperature set above, the seal temperature control unit raises and lowers the heat generation temperature of the upper and lower top seal holders e12 and e22 and the upper and lower tail seal holders e13 and e23. Then, adjustment is performed so that the temperatures of the upper and lower top seal holders e12 and e22 and the upper and lower tail seal holders e13 and e23 coincide with the set temperature.

(Example of change)
The packaging material 1 shown in FIG. 1 was provided with a heat-shrinkable film 5 for shrink separately from the bubble cushioning material 2. In addition, the packaging material 1 does not include the heat-shrinkable film 5 different from the bubble cushioning material 2, and can be implemented as a material in which the closing film 4 of the bubble cushioning material 5 thermally shrinks and shrinks the packaged object p. . In other words, the present invention can be implemented even when the closing film 4 also functions as the heat shrinkable film 5.

In the example shown in FIGS. 3 to 6 and FIG. 7A, the center seal roller d2 is the above-described bubble-absorbing material fusion processing unit. A sealer d7 that generates heat as a unit may be employed as the bubble cushioning material fusion processing unit (FIG. 7C). The packaging material 1 whose both ends in the width direction are passed through the center drive rollers d1 and d1 is passed between the pair of sealers d7 arranged with the heat generating surfaces facing each other. In the example shown in FIG. 7C, a pair of center sub-drive rollers d8 is provided downstream of the sealer d7 in addition to the pair of center drive rollers d1 as the drawer. The center auxiliary drive roller d8 pulls out the packaging material 1 between the pair of sealers d7. The center sub-drive roller d8 may have the same configuration as the center drive roller d1. However, the center auxiliary drive roller d8 does not require the above-described configuration for remaining heat. Further, only one sealer d7 may be provided without being paired, and a roller may be employed instead of the other sealer d7 (not shown).
The operation of the belt conveyor c1 of the center conveyor device c may be continuous or may be intermittent.

In the joint part 6 of the pillow package, the heat shrinkable film 5 may be melted together with the bubble cushioning material 2 (FIG. 2 (B)). By setting the temperature, only the bubble buffer 2 may be melted and the heat-shrinkable film 5 may not be melted (FIG. 2A). When the heat-shrinkable film 5 is not melted, the area overlapped by the center drive roller d4 of the packaging material 1 remains almost as it is for the joint portion 6. If it is desired to make the palm part 6 narrower than the range, a part of the palm part 6 may be cut off.

In addition, as shown in FIGS. 8A and 8B, a fusing roller can be employed as the center seal roller d2. The heat generating portion, that is, the outer peripheral surface of the fusing roller is formed in a truncated cone shape whose diameter gradually increases downward. The fusing roller welds a portion that contacts the outer periphery of the lower end of the truncated cone at both ends in the width direction of the packaging material 1 and a portion of the packaging material 1 above the welded portion (an end portion in the width direction). Cut off. That is, the center seal roller d2 in this example is a cutter having the lower end of the truncated cone as a sealer for welding and the lower end as a cutting edge. As shown in FIGS. 8 (A) and 8 (B), the center seal row d2 is such that only a part of the part of the packaging material 1 that is overlapped in the width direction in the above-mentioned width direction is left as a joint part and the others are removed. A pair of removal rollers d9 is provided downstream of the center seal roller d2. The removing roller d9 removes from the pillow package formed with the removed portion interposed therebetween.
Although not shown in FIGS. 8 (A) and 8 (B), a partition is provided between the article p and the rollers d1, d2, d9 in the vertical direction. The partition is provided with a slit extending in the transfer direction, and only the both ends in the width direction of the packaging material 1 projecting above the article to be packaged p are exposed above the partition through the slit. Therefore, after the formation of the joint portion 6, the removed portion is separated and recovered from the formed pillow package by a partition.

FIG. 8C shows a modified example of the sealer d7 in FIG. 7C. The sealer d7 shown in FIG. 7 (C) is fixed and does not change its position, and a portion of the packaging material 1 that overlaps with the palm of the hand is passed through a gap between the pair of sealers d7. The pair of sealers d7 shown in FIG. 8 (C) are located on the left and right sides in the transport direction (open arrows) indicated by solid lines with respect to both widthwise ends of the packaging material 1 superposed by the center drive roller d1. From the distant position, it approaches the both ends and forms the palm joint portion 6 as shown by the dashed line, and separates from the palm joint 6 after the formation as shown by the two-dot chain line. Each of the pair of sealers d7 moves from the position indicated by the solid line to the position indicated by the one-dot chain line and the position indicated by the two-dot chain line in synchronization with the transfer of the packaging material 1, and returns to the position indicated by the solid line again.

(Summary)
The shrink wrapping body of the air cap sheet (registered trademark), that is, the bubble cushioning material, is shrunk by pillow wrapping, whereby the product in the bag (packaging material) is fixed, and also withstands external impact by the bubble wrap (registered trademark). An environmentally friendly packaging method that provides a package and does not use excess materials.
In the shrink air cap sheet (packing material 1) obtained by shrinking the air cap sheet as described above, the surface that becomes the surface of the pillow package is a flat surface without undulation, and the surface that becomes the inner surface of the bag (packaging material 1) is It is an uneven surface formed by the bubbles k, and has elasticity so that the product in the bag is not damaged even when subjected to an external impact.
The shrink air cap sheet shrinks along the shape of the product by passing it through a hot air tunnel after pillow packaging, so that even if a plurality of products in the bag are housed, a package that is firmly fixed without being rubbed is realized.

The package 100 after manufacture will be described in which the feed direction of the packaging material 1 during manufacture is the horizontal direction, and the direction orthogonal to the horizontal direction and the vertical direction is the vertical direction. An existing horizontal seal edge (armpit 6) is formed, and a vertical seal intersecting the horizontal seal edge (armpit 6) on both left and right sides (both front and rear sides in the feed direction) of the product. An edge is formed, and the package 100 is sealed.
That is, the shrink air cap sheet (packaging material 1) is a thermoplastic resin having polyethylene or the like as a base material and has heat welding properties. Regarding the package 100 which is housed in a bag made of the packaging material 1 and sealed by heat welding, the product extends from the bag body particularly over the left and right ends on the front side of the bag, and is bent along the bag body. The longitudinal direction of the bag extends in the vertical direction on both sides adjacent to the left and right edges of the stored horizontal seal edge (the joint portion 6) and the stored product, and intersects with the horizontal seal edge. Formed at the center position of the thickness, after the packaging consisting of a narrow vertical seal that is set so that the width of the protrusion from the bag body is shorter than the horizontal seal edge, and then passed through a hot air tunnel, it follows the shape of the product Because of shrinkage, it is possible to obtain a shrink air cap sheet package having a stable product storage state.

DESCRIPTION OF SYMBOLS 1 Wrapping material (of packing material 100) 2 Bubble cushioning material (of wrapping material 1) 3 Sheet (of bubble wrapping material 2) 4 Closing film (of wrapping material 2) 5 Heat shrinkable film (of wrapping material 1) 6 ( Joint part (of packaging 100) 10 Web (of raw material) (of packaging material 1)
Reference Signs List 100 packaging body a supply conveyor device a1 belt conveyor (of supply conveyor device a) b film raw device b1 holding shaft (of film raw device b) b2 feed roller (of film raw device b) c center conveyor device c1 ( Belt conveyor c2 (of center conveyor device c) Former c21 (of former c2) Side plate c22 (of former c2) Bottom plate c23 Guide plate (of former c2) c24 Slant side d of (guide plate c23) d Center Device d1 Center drive roller d10 (of center device d) Preheater d11 Rotary shaft d12 (of center drive roller d1) First drive unit d2 Center seal roller d20 (of center device d) Heater d21 (of center seal roller d2) Rotation axis d22 Second drive unit d3 (for center device d Height adjustment mechanism d31 Height adjustment handle (of height adjustment mechanism d3) d4 Holder (of center device d) Holder d41 (of holder d4) Mounting part d42 Mounting tool d43 Head of mounting tool d42 (Height) The operating shaft d51 (of the operating shaft d5) The retaining member d6 The joint adjustment member d61 (of the center device d) The oblique side d62 (of the joint adjustment member d6) d62 (of the joint adjustment member d6)
d63 (for joint adjustment member d6)
d7 Sealer (of center device d) d8 Center drive auxiliary roller (of center device d) d9 Removal roller (of center device d)
e Top and tail seal device e1 Upper operating part e10 (of the upper operating part e1) Upper frame e11 (of the upper frame e10) Blade e12 (of the upper frame e10) Top seal holder e13 (of the upper frame e10) Tail seal holder e2 (of the top and tail seal device e) Lower operating part e20 (of the lower operating part e2) Lower frame e21 (of the lower frame e20) receiver e22 (of the lower frame e20) top seal holder e23 Tail seal holder (of lower frame e20) f carry-out conveyor device f1 belt conveyor (of carry-out conveyor device f) g shrink device k air bubble (of bubble cushioning material 2) p packaged object (of package 100) t1 (upper frame e10) ) Upstream upper separation position t2 (upper frame e10) upper sandwiching position t3 ( Downstream upper separating position t4 (of frame e10) Uppermost position t5 (of upper frame e10) Upper lower separating position t6 (of lower frame e20) Lower clamping position t7 (of lower frame e20) Downstream lower position (of lower frame e20) Separated position t8 Lowermost position (of lower frame e20)

Claims (4)

A package comprising a resin-made packaging material and a packaged object covered with the packaging material,
The packaging material is a sheet-like material provided with a bubble cushioning material,
The bubble cushioning material is intended to project a plurality of convex bubbles from one surface of the packaging material,
The plurality of air bubbles are distributed or arranged over substantially the entirety of the one surface of the packaging material,
The one surface of the packaging material faces the object to be packaged, and the tip sides of the plurality of convex bubbles come into contact with the surface of the object to be packaged,
The packaging body is a pillow packaging body, the packaging material is wound around the article to be packaged, and the one surface at both ends in the winding direction of the packaging material is configured to form a jointed palm jointed and fused. Yes,
The packaging material includes a heat-shrinkable film that has been heat-shrinked to the surface opposite to the one surface,
A shrink package in which the heat-shrinkable film presses the air bubbles toward the object to be packaged. The bubble cushioning material is a sheet-like sheet integrally formed of a polyethylene sheet and a polyethylene closing film overlapping the sheet,
One surface of the sheet includes the plurality of bubbles as the one surface of the packaging material,
The closing film is provided on a surface opposite to the one surface with respect to the sheet, and closes a base end opening of the bubble to form a bubble chamber.
The heat-shrinkable film is a resin-made resin film having heat-shrinkability, covering a surface of the closing film opposite to the sheet.
2. The shrink wrapper according to claim 1, wherein at least two side portions of the sheet in the winding direction constitute the fused portion in the joint portion. A plurality of convex bubbles that protrude from one surface are distributed or arranged substantially over the entire surface of the one surface, and a band-shaped member including a heat-shrinkable film provided on the other surface of the bubble buffer, and About the packaging material,
The packaging material is moved along the longitudinal direction of the band-shaped packaging material, and the object to be packaged is arranged on the one surface of the bubble cushioning material during movement, and the width of the band-shaped packaging material in the width direction of the band-shaped packaging material is moved from the object to be packaged. Winding so as to surround the perimeter of the object to be packaged sequentially about the parts protruding to both sides,
By heating the wrapping material in such a manner that both ends in the width direction of the bubble cushion are overlapped with each other and heated to form a joint portion in which both ends in the width direction of the bubble cushioning material are heat-sealed, and after the heat-sealing. Heat sealing and closing a portion of the packaging material located in front and behind the object to be packaged in the longitudinal direction of the cylindrical packaging material, and cutting the band-shaped packaging material at the heat sealed portion. Thereby, a pillow package having the joint portion covering substantially the entire surface of the packaged object with the bubble cushioning material,
A method for manufacturing a shrink package, wherein the pillow package is heated to a temperature at which the heat-shrinkable film thermally shrinks, and the packaged object is shrunk through the bubble cushioning material. A plurality of convex bubbles protruding from one surface are distributed or arranged on substantially the entirety of the one surface, and a band-like shape including a bubble cushioning material and a heat-shrinkable film provided on the other surface of the bubble cushioning material. A packaging device for packaging an article to be packaged using a packaging material,
A holding unit that holds the web around which the packaging material is wound, a drawing unit that sequentially pulls out the packaging material from the holding unit, and a placement unit that places the article to be packed on the one surface of the drawn packaging material. A guide portion that sequentially contacts the both sides in the width direction of the drawn out packaging material to guide the both sides of the packaging material toward the packaged object, and heats the both sides to at least the width direction of the bubble cushioning material. A bubble buffer material fusion-bonding section for heat-bonding both sides to each other, a seal processing section for heat-sealing portions of the packaging material before and after in a transfer direction with respect to the packaged object, and the packaging at the heat-sealed portion. A cutting unit that cuts the material, and a heating unit that contracts the heat-shrinkable film by heating,
A heater is provided in the bubble buffering material fusion processing section, and the bubble buffering material fusion processing section maintains a temperature required for the heat fusion by heat generation of the heater.
The heater has a heat-sealing temperature of 130 degrees Celsius, a polyethylene sheet having a plurality of air bubbles having a diameter of 10 mm and a protrusion width of 3.5 mm as the air cushioning material, and the heat shrinkable film made of polyethylene. Using the configured packaging material, the feeding speed of the packaging material is 30 mm per second, and while the packaging material having a width of 240 mm is fed by 9 m, the temperature fluctuation of the bubble-absorbing material fusion processing unit is increased by more than 128 degrees Celsius. It can be limited to a range smaller than 132 degrees,
The guide unit guides the packaging material so as to surround the object to be packaged along with the drawer of the drawer unit so that both sides of the packaging material are joined together, and overlaps the two sides, and the packaging is performed by the bubble cushioning material fusion processing unit. Heating at least the two sides of the bubble cushioning material by applying heat while sandwiching the both sides of the material to form a joint part, and performing the heat sealing by the seal processing unit and the cutting by the cutting unit, Forming a pillow package having the joint portion covering substantially the entire surface of the packaged object with the bubble cushioning material,
The heating unit is disposed downstream of the cutting unit in the transfer direction, and shrinks the heat-shrinkable film by the heating during the movement of the pillow package, whereby the cover is interposed through the bubble cushioning material. An apparatus for manufacturing a shrink package, which shrinks the package to form a shrink package.