JP7126652B2 - Shrink wrapper and shrink wrap method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a shrink wrapper and a shrink packaging method for wrapping the entire object such as cabbage, radish, and pumpkin with the heat shrinkable film so that the heat shrinkable film adheres to the entire surface of the object. It is.

In general, 1/2 or 1/4 cut cabbages, radishes, pumpkins, etc. are wrapped in a heat-shrinkable film and displayed in stores. A dedicated automatic packaging machine is used to shrink-wrap the objects having such various shapes. In this automatic packaging machine, a band-shaped heat-shrinkable film supplied from a roll-shaped film roll is provided with a large number of small through-holes, and the entire supplied package is covered with the heat-shrinkable film with a margin. Temporarily wrap it so that it covers it loosely. After that, this temporary package is conveyed into a shrink tunnel and heated by blowing hot air or the like. As a result, the heat-shrinkable film is heat-shrunk while the air inside the heat-shrinkable film escapes through the large number of small through-holes, and the heat-shrinkable film adheres to the entire surface of the object to be packaged, thereby shrinking the heat-shrinkable film. be packaged.

By the way, as a conventional technology of the heat-shrinkable film used for the above-mentioned shrink packaging, Patent Document 1 discloses that a film has a large number of perforations, and is formed on one surface of the film in the direction in which the tear propagates in the tear test of the film. A non-penetrating incision A is provided in the film extending in a direction of 30 to 60° positive clockwise with respect to a certain tear propagation direction, and the other surface of the film is provided in a counterclockwise direction with respect to the tear propagation direction. A perforated film is disclosed which is provided with a cut B that does not penetrate the film and extends in the direction of -60 to -30° with the negative of , and a perforation is provided at the intersection of the cut A and the cut B.

JP 2017-105541 A

However, in the above-described conventional shrink packaging method, if the item to be packaged is a pumpkin cut into 1/2 or 1/4, the heat-shrinkable film is placed in the range where it is in close contact with the cut surface of the pumpkin. The cut surface is exposed to air through a large number of small through holes. For this reason, a state occurs in which white powder (starch) emerges from the cut surface and the surface becomes white. In such a state, there is no problem with the quality of the pumpkin itself, but the appearance is unfavorable, which is a factor that hinders the consumer's desire to purchase.

Moreover, in the perforated film according to the invention of Patent Document 1 described above, a large number of small through-holes are simply provided at regular intervals in the strip-shaped film, and the above-described problems cannot be solved.

The present invention has been made in view of the above points, and provides a shrink package and a shrink packaging method that suppress inconvenience caused by a large number of small through-holes provided in a heat-shrinkable film for shrink packaging an object to be packaged. for the purpose.

As a means for solving the above problems, the present invention relates to a shrink-wrapped body described in claim 1. A shrink-wrapped body obtained by wrapping an entire cut pumpkin with a heat-shrinkable film, A large number of small through-holes provided in the heat-shrinkable film are characterized in that they are concentrated on the outer skin of the pumpkin .

The invention according to the shrink packaging method described in claim 2 is a shrink packaging method for packaging the whole cut pumpkin with a heat-shrinkable film, wherein the cut forming a large number of small through-holes in a range facing the outer skin of the pumpkin when the pumpkin is packaged ; and a step of shrink-wrapping the cut pumpkin by heat-shrinking the heat-shrinkable film after the temporary packaging. It is a thing.

According to the shrink wrapper of the present invention, the large number of small through-holes provided in the heat-shrinkable film for air venting are hardly located in the areas where contact with the air should be avoided on the surface of the item to be packaged. Inconvenience caused by a large number of small through holes can be suppressed. For example, if the item to be packaged is a 1/2 or 1/4 cut pumpkin, a large number of small through-holes provided in the heat-shrinkable film are concentrated in the outer skin of the pumpkin, and A large number of small through-holes provided in the heat-shrinkable film are hardly positioned on the cut surface. As a result, contact between the cut surface of the pumpkin and the air can be suppressed, so that it is possible to sufficiently delay the state in which the cut surface of the pumpkin is covered with white powder and the surface becomes white.

In the shrink-wrapping method of the present invention, the object to be packaged is shrink-wrapped so that the large number of small through-holes provided in the heat-shrinkable film are concentrated in a specific portion of the object to be packaged. As a result, the large number of small through-holes provided in the heat-shrinkable film for venting air are hardly positioned in the portion of the surface of the object to be packaged that should be avoided from coming into contact with the air, resulting in inconvenience caused by the large number of small through-holes. can be suppressed.

FIG. 1 is a perspective view of a shrink wrap according to an embodiment of the invention. FIG. 2 is a schematic diagram of a shrink wrapping machine. FIG. 3 is a perspective view of the shrink packaging apparatus of FIG. 2 showing how pumpkins are supplied onto a heat-shrinkable film formed into a substantially U shape by a film former. FIG. 4 is a layout diagram of a large number of small through holes provided in a strip-shaped heat-shrinkable film employed in the shrink wrapper according to the embodiment of the present invention. FIG. 5 is a layout diagram of a large number of small through holes according to another embodiment.

DETAILED DESCRIPTION OF THE INVENTION Embodiments for carrying out the present invention will be described in detail below with reference to FIGS. 1 to 5. FIG.
As shown in FIG. 1, the shrink package 1 according to the embodiment of the present invention is such that the heat-shrinkable film F adheres to the entire surface of the object to be packaged (pumpkin 2), and the entire pumpkin 2 is heat-shrunk. It is shrink-wrapped with a flexible film F. The object to be packaged is a pumpkin 2 cut into quarters in this embodiment. The surface of this pumpkin 2 is composed of cut surfaces 3, 3 and an outer skin 4 which are substantially perpendicular to each other.

As the heat-shrinkable film F, for example, a crosslinked polyethylene film is adopted. A large number of small through holes 10 are provided in the heat-shrinkable film F. The large number of small through-holes 10 are formed in a range facing the portion (specific portion) of the outer skin 4 of the pumpkin 2 when the pumpkin 2 is wrapped with the heat-shrinkable film F. As shown in FIG. The hole diameter of the small through-holes 10 is set to be within the range of 0.3 to 3.0 mm after shrink-wrapping. Each small through hole 10 is formed at appropriate intervals. These small through-holes 10 are for removing air from the inside of the heat-shrinkable film F when heat-shrinking the heat-shrinkable film F in a shrink tunnel 20 of a shrink packaging device 15, which will be described later. In the present embodiment, as shown in FIGS. 2 and 4, a heat-shrinkable film F supplied in a belt form from a roll-shaped film roll 23 of a shrink packaging device 15, which will be described later, is longitudinally stretched at one end in the width direction. A large number of small through holes 10 are formed along the direction.

In the shrink wrap package 1 according to the embodiment of the present invention, as can be seen from FIG. is configured to concentrate In other words, in the present shrink wrapper 1, on the surface of the pumpkin 2, on the two cut surfaces 3, 3, the large number of small through holes 10 provided in the heat-shrinkable film F are configured so as not to be located as much as possible. . The small through holes 10 shown in FIGS. 1, 3 and 4 are exaggerated in size for easy understanding.

Next, a shrink packaging machine 15 for manufacturing the shrink packaging body 1 described above will be described with reference to FIGS. 2 to 4. FIG. For convenience of explanation, the right side of FIG. 2 is the downstream side in the conveying direction, and the left side of FIG. 2 is the upstream side in the conveying direction.
The shrink packaging device 15 is composed of a so-called horizontal reverse pillow packaging device. The shrink-wrapping device 15 is a roller of a cylindrical body 26 through which a belt-shaped heat-shrinkable film F supplied from a roll-shaped film roll 23, which is a continuous body of the heat-shrinkable film F, hits the roller surface (peripheral surface). a needle roller 18 which rotates to form a large number of small through holes 10 in the heat-shrinkable film F in a range facing the outer skin 4 of the pumpkin 2 when the pumpkin 2 is wrapped. A temporary packaging means 19 for temporarily packaging the pumpkin 2 so as to cover the entire pumpkin 2 with a heat-shrinkable film F having a large number of small through holes 10, and a temporary packaging body 40 formed by the temporary packaging means 19. A shrink tunnel 20, which is a heating device for heat-shrinking the heat-shrinkable film F by heating, is provided.

More specifically, as shown in FIG. 2, the shrink packaging device 15 includes a supply conveyor 17 that supplies pumpkins 2, and a band-shaped heat-shrinkable film F supplied from a roll-shaped film roll 23. A needle roller that is brought into contact with one widthwise end of the heat-shrinkable film F and rotates as the heat-shrinkable film F is fed to form a large number of small through holes 10 along the longitudinal direction of the heat-shrinkable film F at one widthwise end thereof. 18 and a group of small through-holes 10 provided along the longitudinal direction at one end in the width direction of the heat-shrinkable film F so that the heat-shrinkable film F faces the outer skin 4 of the pumpkin 2 . A temporary packaging means 19 for temporarily packaging the entire pumpkin 2 so as to cover it with a margin, and a temporary packaging body 40 after temporarily packaging the pumpkin 2 by the temporary packaging means 19 so as to cover the entire pumpkin 2 with a heat-shrinkable film F. A shrink tunnel 20 for heat-shrinking the heat-shrinkable film F and adhering it to the entire surface of the pumpkin 2 while the air inside the heat-shrinkable film F is released from the large number of small through holes 10 by heating the heat-shrinkable film F. I have.

Continuing from the downstream end of the supply conveyor 17 in the conveying direction, a conveyer 29 of the temporary packaging means 19, which will be described later, is arranged. A roll film roll 23 is arranged below the upstream end of the transport conveyor 29 in the transport direction. A plurality of guide rollers 24, 24 for guiding the belt-shaped heat-shrinkable film F from the roll film roll 23 in a predetermined direction are arranged downstream of the roll film roll 23 in the transport direction. Among the guide rollers 24, 24 that are intermingled, needle rollers 18 are arranged to form a large number of small through holes 10 in the belt-like heat-shrinkable film F guided by each of the guide rollers 24. As shown in FIG. The needle roller 18 is rotatably supported by a cylindrical body 26 (roller) on which the band-shaped heat-shrinkable film F hits the outer peripheral surface (roller surface), and a cylindrical body 26 (roller) that is spaced apart from the outer peripheral surface of the cylindrical body 26 . and needles 29 protruding in large numbers. A large number of small through holes 10 are formed in the heat-shrinkable film F by the large number of needles 27 of the needle roller 18 . The needle roller 18 has a large number of needles 27 around a cylindrical body 26 and partially projecting in the axial direction thereof. The positions of the large number of small through holes 10 formed in the heat-shrinkable film F are specified by the positions of the large number of needles 27 . In short, in this embodiment, the group of needles 27 is positioned around the cylindrical body 26 at one end in the axial direction, and as shown in FIG. A large number of small through-holes 10 are formed along the longitudinal direction in the portion.

In addition, if the group of needles 27 is positioned around the cylindrical body 26 at a substantially central portion in the axial direction, as shown in FIG. A large number of small through holes 10 are formed along the . Also, if the groups of needles 27 are positioned around the cylindrical body 26 at both ends in the axial direction, as shown in FIG. A large number of small through holes 10 are formed along the direction. In short, in the shrink package 1, a large number of small through-holes 10 are provided in the heat-shrinkable film F on the surface of the object to be packaged (pumpkin 2), at the portion (cut surface 3) where contact with air should be avoided. The positions of the needles 27 of the needle roller 18, that is, the range of the small through holes 10 provided in the heat-shrinkable film F are specified so that the needles 27 are not positioned or are not positioned as much as possible. The range of the large number of small through-holes 10 provided in the heat-shrinkable film F is appropriately determined according to the type of the packaged item and the orientation and size of the supplied packaged item. If there is no portion on the surface of the object to be packaged that should avoid contact with the air, a large number of needles 27 are arranged around the cylindrical body 26 over substantially the entire area in the axial direction, and a band-shaped heat-shrinkable film is used. A large number of small through holes 10 are formed in substantially the entire area of F. Above the roll-shaped film roll 23, a tension adjusting roller is slidably supported along a slit extending substantially in the conveying direction and rotatably supported at a desired position to adjust the tension of the heat-shrinkable film F. 28 are arranged.

As shown in FIG. 2, the temporary packaging means 19 includes a transport conveyor 29 that transports the pumpkins 2 from the supply conveyor 17, a film former 30 that is arranged between the transport conveyor 29 and the supply conveyor 17, and the film. A center seal portion 31 arranged at a distance downstream from the former 30 in the conveying direction, and a top seal portion 32 arranged at a distance downstream from the center seal portion 31 in the conveying direction. . As can be seen from FIG. 3, the film former 30 is formed by bending a plate into a substantially U-shape with an open top. The film former 30 turns the band-shaped heat-shrinkable film F supplied from the roll-shaped film roll 23 by about 300° to form it into a substantially U-shape with openings in the upper direction and in the transport direction. Configured.

In the center seal portion 31, a pair of left and right rollers 33A (33B) and 33A (33B), which are in contact with each other at the center portion in the width direction of the heat-shrinkable film F, are arranged close to each other along the conveying direction. Two pairs are arranged. For example, an electric heater or the like is attached to the pair of rollers 33B, 33B on the downstream side in the conveying direction so that both widthwise ends of the nipped heat-shrinkable film F can be welded. Both ends of the heat-shrinkable film F on which the pumpkin 2 is placed are nipped by these two pairs of rollers 33A (33B) and 33A (33B), and are heated by the pair of rollers 33B and 33B on the downstream side in the transport direction. Both ends of the shrinkable film F are welded.

The top seal portion 32 is a cylindrical heat-shrinkable film F that encloses the pumpkin 2, and the portion on the upstream side in the conveying direction from the pumpkin 2 and the portion on the downstream side in the conveying direction from the pumpkin 2 are sequentially arranged in the conveying direction. It seals and cuts in the direction perpendicular to it. The top seal portion 32 includes a pair of upper and lower seal blocks 35, 35 that can contact and separate from each other, and a pair of upper and lower seal blocks that are arranged upstream of the seal blocks 35, 35 in the conveying direction and can contact and separate from each other. The blade blocks 36, 36 are provided. A pair of upper and lower seal blocks 35, 35 are provided with, for example, an electric heater or the like so as to weld the heat-shrinkable film F sandwiched between the heat-sealed portions 35A, 35A at the ends thereof. The pair of upper and lower seal blocks 35, 35 are in contact with each other at approximately the center in the height direction of the pumpkin 2, and are sandwiched by heat seal portions 35A, 35A provided at the tip portions of the respective seal blocks 35, 35. The adhesive film F can be sealed.

The pair of upper and lower blade blocks 36, 36 are arranged infinitely close to the upstream side of the pair of upper and lower seal blocks 35, 35 in the conveying direction. A pair of upper and lower blade blocks 36, 36 are formed with blade portions 36A, 36A at their tip portions, respectively. A pair of upper and lower seal blocks 35 , 35 seal the heat-shrinkable film F on the upstream side in the conveying direction at two locations along the conveying direction. The sandwiched heat-shrinkable film F can be cut by the tip blades 36A, 36A of the respective blade blocks 36, 36 in contact with each other substantially in the center. As a result, the temporary packaging means 19 can temporarily package the entire pumpkin 2 with the heat-shrinkable film F so as to cover the entire pumpkin 2 with a margin. In this way, the packaging state in which there is a space between the surface of the pumpkin 2 and the heat-shrinkable film F is the temporary package 40 .

A shrink tunnel 20, which is a heating device, is disposed downstream of the top seal portion 32 of the temporary packaging means 19 in the transport direction and at the downstream end of the transport conveyor 29 in the transport direction. The shrink tunnel 20 performs heat treatment with hot air or the like while transporting the material transported inside. Then, the temporary package 40 transported from the transport conveyor 29 into the shrink tunnel 20 is heated by hot air or the like, and the air inside is released from the large number of small through holes 10 formed in the heat-shrinkable film F. The heat-shrinkable film F is heat-shrunk and adheres to the entire surface of the pumpkin 2. - 特許庁

Next, a method for shrink-wrapping the pumpkin 2 using the shrink-wrapping apparatus 15 described above will be described.
A plurality of pumpkins 2 having substantially the same size are sequentially supplied on a supply conveyor 17 at intervals. At this time, it is necessary to keep the direction of the pumpkin 2 (cut into 1/4) substantially constant. is oriented in either the left or right direction in the conveying direction. The orientation of the outer skin 4 of the pumpkin 2 is determined by the positions of the numerous small through holes 10 provided in the band-shaped heat-shrinkable film F (one end or the other end in the width direction of the heat-shrinkable film F).

The band-shaped heat-shrinkable film F from the roll-shaped film roll 23 is guided by a plurality of guide rollers 24, 24, and is stretched along its longitudinal direction at one end in its width direction by the rotating needle roller 18. A large number of small through holes 10 are formed in the film and guided to the film former 30 of the temporary packaging means 19 . Subsequently, the heat-shrinkable film F guided to the film former 30 is formed by the film former 30 into a substantially U-shape that is opened upward and in the transport direction. It is conveyed while the directional ends are close to each other.

Subsequently, the pumpkins 2 supplied by the supply conveyor 17 are sequentially supplied onto the heat-shrinkable film F formed in a substantially U shape on the film former 30 . At this time, the outer skin 4 of the pumpkin 2 and the group of small through holes 10 provided along the longitudinal direction at one widthwise end of the heat-shrinkable film F substantially face each other (see FIG. 3). Subsequently, the pumpkin 2 is conveyed on the conveyer 29 together with the heat-shrinkable film F in this state. Then, both ends of the heat-shrinkable film F in the width direction are sandwiched by the two pairs of rollers 33A (33B) and 33A (33B) of the center seal portion 31 of the temporary packaging means 19, and the pair of rollers on the downstream side in the conveying direction. Both ends of the heat-shrinkable film F are welded by 33B, 33B to form a cylindrical heat-shrinkable film F containing the pumpkin 2 .

Subsequently, when conveyed on the conveyer 29 in this state, the cylindrical heat-shrinkable film containing the pumpkin 2 is sealed by a pair of upper and lower seal blocks 35, 35, which is the top seal portion 32 of the temporary packaging means 19. In F, the portion on the upstream side in the conveying direction from the pumpkin 2 and the portion on the downstream side in the conveying direction from the pumpkin 2 are sequentially welded, and a pair of upper and lower blade blocks 36, 36 move the welded portions upstream in the conveying direction. The side parts are cut sequentially. At this point, the group of small through-holes 10 provided along the longitudinal direction at one widthwise end of the band-shaped heat-shrinkable film F is arranged so as to face substantially the entire or part of the outer skin 4 of the pumpkin 2. Then, the entire pumpkin 2 is temporarily wrapped (temporary package 40) so as to be covered with a heat-shrinkable film F with a margin.

Subsequently, this temporary package 40 is transported from the transport conveyor 29 into the shrink tunnel 20 . In the shrink tunnel 20, hot air or the like is blown to the temporary packaging 40 while the temporary packaging 40 is being transported. As a result, while the air inside the heat-shrinkable film F in the temporary package 40 escapes from the numerous small through holes 10 provided in the heat-shrinkable film F, the heat-shrinkable film F is heat-shrunk and the surface of the pumpkin 2 is The pumpkin 2 is shrink-wrapped with a heat-shrinkable film F in close contact with the whole. Then, as shown in FIG. 1, a large number of small through-holes 10 provided in the heat-shrinkable film F are concentrated on the outer skin 4 of the pumpkin 2 to manufacture the shrink wrap 1 according to the present embodiment. be done.

As described above, in the shrink package 1 according to the embodiment of the present invention, the large number of small through holes 10 provided in the heat-shrinkable film F are used as the packaged object, for example, the outer skin 4 of the pumpkin 2 (specified ) and is hardly positioned on the cut surfaces 3, 3, so contact between the cut surfaces 3, 3 and the air can be suppressed. As a result, it is possible to sufficiently delay the state in which white powder appears on the cut surfaces 3, 3 of the pumpkin 2 and the surfaces become white. As a result, it is possible to suppress a decrease in consumer desire to buy.

In addition, in the shrink packaging method according to the embodiment of the present invention, a part of the width direction (for example, one width direction end) of the strip-shaped heat-shrinkable film F supplied from the roll film roll 23 is brought into contact. The rotation of the needle roller 18 accompanying the supply of the heat-shrinkable film F causes the heat-shrinkable film F to form a large number of small through holes 10 along its longitudinal direction at a portion of the heat-shrinkable film F in the width direction (for example, one end in the width direction). forming. As a result, a large number of small through holes 10 can be formed at desired positions in the band-shaped heat-shrinkable film F. , can be easily concentrated at the site of the skin 4 of the pumpkin 2 .

When the item to be packaged is a pumpkin 2 cut in half, the needle roller 18 of the shrink packaging device 15 rotates the group of needles 27 around the cylindrical body 26. Positioned at both ends in the axial direction, as shown in FIG. 5(b), a large number of small through holes 10 are formed at both ends in the width direction of the strip-shaped heat-shrinkable film F along the longitudinal direction. to Then, when the cut surface 3 of the pumpkin 2 is brought into contact with the supply conveyor 17, the outer skin 4 of the pumpkin 2 and the heat-shrinkable film F at both ends in the width direction of the temporary package 40 are stretched along the longitudinal direction. The group of small through-holes 10 provided in the second direction are opposed to each other. As a result, in the shrink package 1, the large number of small through holes 10 formed in the heat-shrinkable film F can be concentrated on the skin 4 of the pumpkin 2. As shown in FIG.

By the way, in the above-described shrink-wrapping device 15, it is necessary to supply the pumpkins 2 to the conveyer 29 in sequence so that the sizes of the pumpkins 2 are substantially the same and the directions of the pumpkins 2 are substantially constant. For this purpose, the shrink packaging device 15 may be provided with a guide mechanism for finely adjusting the direction of the objects to be packaged that are successively conveyed on the supply conveyor 17 . Moreover, the shrink packaging device 15 may be provided with detection means for detecting the type of the article to be packaged conveyed on the supply conveyor 17 and detecting the size and orientation of the article. Further, based on the detection signal (orientation of the object to be packaged) from the detection means, the orientation of the object to be packaged may be finely adjusted by the guide mechanism.

Furthermore, the shrink packaging device 15 detects the size of the items to be packaged that are sequentially conveyed on the supply conveyor 17 within a specified size range based on the detection signal (the size of the items to be packaged) from the detection means. It is also possible to provide a sorting mechanism for supplying only the items of (1) to the conveyer 29 . Furthermore, in the shrink packaging device 15, the group of needles 27 of the needle roller 18 is configured to be slidable along the axial direction of the cylindrical body 26, and for the items to be packaged that are sequentially conveyed on the supply conveyor 17, A control device may be provided for changing the positions of the needles 27 of the needle roller 18 along the axial direction based on the detection signal (kind of the item to be packaged) from the detection means.

The shrink package 1 and the shrink packaging method according to the embodiment of the present invention can be embodied in the above-described horizontal reverse pillow packaging machine 15. In addition, a horizontal normal pillow packaging machine and a vertical pillow packaging machine can be used. , an L-type sealer machine, etc., can also be used.

1 shrink wrap body, 2 pumpkin (item to be packaged), 3 cut surface, 4 skin (specific part), 10 small through hole, F heat-shrinkable film

Claims (2)

whole pumpkin cut A shrink package obtained by wrapping with a heat-shrinkable film,
A large number of small through holes provided in the heat-shrinkable film arepumpkin skin partA shrink wrap, characterized in that it concentrates on whole pumpkin cut A shrink packaging method for packaging with a heat-shrinkable film,
For the strip-shaped heat-shrinkable film to be supplied,pumpkin cut upthe saidpumpkin skin partA step of providing a large number of small through holes in a range facing the
In the heat-shrinkable film having a large number of small through holes,pumpkin cut upso as to cover the wholepumpkin cut upA step of temporarily packaging the
After temporary packaging, the heat-shrinkable film is heat-shrunk topumpkin cut upand shrink-wrapping a.

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