JPH107112A - Packaging sheet bending prevention device - Google Patents

Abstract

(57) [Problem] To prevent a Y-shaped curl from being generated in a punched packaging sheet by forcibly cooling a packaging film after completion of sealing while being curved in a direction opposite to the Y-shaped curl. Provided is an apparatus for preventing a packaging sheet from being bent. SOLUTION: A pocket is formed in a strip-shaped container film, an article is filled in the pocket, a cover film is put on the container film, and both films are thermally bonded by a sealing device. An apparatus for preventing a packaging sheet from being bent, which is used in a packaging machine for punching a packaging sheet of a desired size. The bending prevention device 10 is a cooling device that is disposed downstream of the sealing device and cools both films in contact with the sealed cover film. When viewed in the width direction of the film, the cooling device 10 moves toward the pocket side. A cooling device 20 having a cooling surface 26a curved in a convex shape, and a film disposed on both sides of the cooling device and engaging with side portions of the film to regulate displacement of the film in the width direction and to form the film. And a movement guide device 30 that moves in the longitudinal direction of the film.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing a wrapping of a wrapping sheet in a wrapping machine. The present invention relates to a bending prevention device.

[0002]

2. Description of the Related Art In a blister package used for packaging tablets and the like, usually, a large number of pockets for filling tablets in a continuous thermoplastic container film are continuously formed in the width and length directions of the film. After filling the tablets into the pockets, a cover film made of aluminum is put on and the two films are heat-bonded. Thereafter, a packaging film (hereinafter referred to as 10 pieces in 5 rows and 2 rows) is formed in a predetermined number. , A container film and a cover film are collectively referred to as a packaging film) as a sheet-like package (hereinafter referred to as a packaging sheet), and a plurality of the punched packaging sheets are stacked and packed in a box or pillow packaging. . In such a wrapping sheet, a curved deformation, that is, a curl occurs after the wrapping is completed due to a bimetal effect caused by a difference in thermal expansion coefficient between the two materials. In particular, when a polypropylene-based film material is used as the container film, the amount of deformation tends to be large, but depending on the type of tablet to be packed or other reasons, the film material having such a large amount of deformation cannot be used. In some cases.

When the packaging sheet curls in the longitudinal direction of the packaging sheet a as shown in FIG. 9 (hereinafter referred to as a Y-shaped curl), as shown in FIG. It may bend in the width direction (hereinafter referred to as X-shaped curl). Assuming that the curvature radius of such a curl is the same for both the Y-shaped curl and the X-shaped curl, the length L of the packaging sheet is much larger than its width W, so The rising heights H ₁ and H ₂ of the edges or side edges satisfy H ₁ > H ₂ . Further, when the packaging sheet a is punched, the longitudinal direction of the packaging sheet is generally set to be the width direction of the band-shaped packaging film. Therefore, the Y-shaped curl is a curl curved along the width direction of the band-shaped packaging film, and the X-shaped curl is a curl curved along the longitudinal direction of the packaging film.

[0004] After the sealing is completed, the packaging sheet punched out by a punching device into a predetermined size is subjected to the following inspection step,
Alternatively, the conveyor is conveyed (in the direction perpendicular to the paper surface of FIG. 11) with the pocket p up as shown in FIG. 11 by the conveyor to the stacking process. To convey as if pressing
If the height H ₁ floating edge is the curvature of the curl radius is small becomes too high, so that hinder the conveyance longer press successfully wrapping sheet feed pawl.

[0005] In order to prevent such deformation of the packaging sheet, a method and an apparatus disclosed in, for example, Japanese Patent Application Laid-Open No. 5-201427 have been provided. In this conventional method, after a container film and a cover film are sandwiched and sealed by a pair of seal rolls, while the film after sealing is wound around one of the seal rolls, a cooling gas is sprayed on the cover film side. It is forcibly cooled from the cover film side, but because the seal roll is a straight cylindrical shape in the width direction of the film, the film is cooled in a flat state when viewed in the width direction. Become. For this reason, there is a problem that a Y-shaped curl is inevitably generated after punching as a packaging sheet after cooling.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a Y-shaped punched packaging sheet by forcibly cooling the packaging film after the sealing is completed in a state where the packaging film is curved in a direction opposite to the Y-shaped curl. An object of the present invention is to provide a device for preventing a sheet from curling, which prevents curling.

[0007]

According to the present invention, a pocket is formed in a strip-shaped container film, an article is filled in the pocket, a cover film is put on the container film, and both films are thermally bonded by a sealing device. After that, in a packaging sheet bending prevention device in a packaging machine that punches the film into a packaging sheet of a desired size by a punching device, both films are disposed downstream of the sealing device and are in contact with the sealed cover film. A cooling device having a cooling surface curved in a convex shape toward the pocket side when viewed in the width direction of the film; and a cooling device disposed on both sides of the cooling device to cool the film. A movement guide device that engages with the side portion to regulate displacement of the film in the width direction and moves with the film in the longitudinal direction of the film. It has been.

In the bending prevention device, receiving portions are formed at least on both sides of the container film at predetermined intervals along the longitudinal direction of the film, and the moving guide device is moved endlessly along the longitudinal direction of the film. A rail and an engagement member attached to the endless rail at the predetermined interval may be provided, and the engagement member may be received in a receiving portion of the film. In the bending prevention device,
A pair of endless rails arranged on each side of the film are arranged one above the other across the film, the engaging member is attached to one endless rail, and the other endless rail has a hole for receiving the engaging member. May be formed and move with the film, sandwiching the edge of the film between a pair of endless rails, or the endless rails disposed on each side of the film may be either one of the upper and lower sides of the film. A guide rail may be arranged on one side, and on the other side, in cooperation with the endless rail, to guide the film across the film. Further, in the bending prevention device, the movement guide device is provided between a position upstream of the sealing device and a position downstream of the punching device, and the movement guide device is provided between the sealing device and the punching device. The film may be transported, or the movement guide device may be disposed only on both sides of the cooling device, and the film may be transported by a device separate from the movement guide device.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 schematically shows a device downstream of a sealing device in a blister packaging machine provided with the bending prevention device of the present invention. In this figure, reference numeral 1 denotes a sealing device which includes an upper seal die and a lower seal die which are separated from each other and which can be approached to each other, and heat seals a container film and a cover film with both seal dies. f ₁ and the longitudinal perforation forming apparatus and transverse perforation forming apparatus roulette vertical and horizontal to the cover film f _2), 4 symbols in the packaging sheet to be produced, stamping device for stamping a product name or the like, 5
Is a punching device for punching a packaging sheet. One embodiment of the curving prevention device of the present invention is generally designated by 10 and is a cooling device arranged downstream of the sealing device 1 (as viewed in the direction of feeding the packaging film) and upstream of the vertical perforation forming device 2. It comprises a device 20 and a movement guide device 30 arranged on each side of the film from upstream of the sealing device to downstream of the punching device. Note that the sealing device, the perforation forming device, the marking device, and the punching device are not the gist of the present invention and may have a known structure, and thus detailed description thereof will be omitted.

Referring to FIG. 2 to FIG.
A pair of guide rods 21 vertically disposed at positions off the side of the transfer path of the packaging film;
Elevating frame 22 guided and supported so as to be able to move up and down,
A cooling tank 23 attached to a lower side of the lifting frame 22 and through which cooling water is passed. The elevating frame 22 is moved up and down via an operating arm 24 which is moved up and down by a cam mechanism or a fluid cylinder (not shown).

[0011] cooling tank 23 is a rectangular member extending along the transfer direction and the width direction of the packaging film, to the lower cooling in contact with the seal already after the packaging film and the cover film f ₂ side cooling A bottom wall 26 forming a surface 26a is provided. The bottom wall 26 is curved in a convex shape downward along the width direction of the film, that is, toward the packaging film. The curvature of the curvature is determined by the material of the container film and the cover film used so as to prevent the Y-shaped curl from being generated in the packaging sheet after punching. A tapered portion 26b is formed on the upstream side of the bottom wall 26. In the cooling tank 23, the downstream side of the cooling surface 26a is slightly lower than the upstream side (for example, 10 mm).
Degree). In the cooling tank 23, a large number of partitions are arranged in parallel in the longitudinal direction of the cooling tank in order to maintain a predetermined curved shape of the bottom wall. A supply pipe 27a for supplying cooling water into the cooling tank is connected to a downstream end of the cooling tank 23, and a drain pipe 27b for discharging cooling water from the cooling tank is connected to the upstream side.

When the operation of the blister packaging machine is started, the cooling tank 23 of the cooling device 20 is located at a position shown in FIG. 2 (a position displaced upward from the transport path of the packaging film).
The cooling surface 26a on the lower side of the cooling tank comes into contact with the packaging film f after the sealing is completed on the cover film side. Then, the packaging film is cooled while moving in the direction indicated by the arrow in FIG.

Although the movement guide devices 30 are arranged on both sides of the transport path of the packaging film f, they have exactly the same structure, so only the device on one side will be described. The movement guide device 30 of this embodiment is provided from a position on the upstream side of the sealing device 1 to a position on the downstream side of the punching device 5. Further, in this embodiment, the two portions 30a and 30b vertically arranged with the packaging film interposed therebetween have an endless belt which moves in a circular manner.

The upper portion 30a, as shown in FIG.
An idle belt wheel 31a disposed upstream of the sealing device 1.
A guide roller 32a disposed adjacent to the idle belt wheel 31a; a drive belt wheel 33a disposed downstream of the punching device 5; and a guide roller 34a disposed adjacent to the drive belt wheel 33a. And an endless rail or endless belt 3 hung on a play and drive belt wheel
5a. As shown in detail in FIG. 6, the endless belt 35a is a toothed belt or a timing belt provided with teeth at regular intervals along the longitudinal direction, and each of the pulleys has a tooth meshing with the teeth of the timing belt. Is a toothed belt wheel formed on the outer periphery. The endless belt 35a has an engaging member, that is, an engaging protrusion 36 that protrudes outward from the rear surface (the surface opposite to the surface on which the teeth are formed).
a are attached at predetermined intervals along the longitudinal direction of the endless belt. The engaging projection 36a is made of, for example, a synthetic resin or metal, and may be integrally embedded in the belt at the tooth portion as shown in FIG. 6, but is integrally formed of the same material as the belt. You may. This engaging projection 36
a is as shown in FIG. 6, is adapted to therewith engage enters the container film f receiving section 41 formed in _one.

The lower portion 30b is, as shown in FIG.
An idle belt wheel 31b disposed upstream of the sealing device 1.
A guide roller 32b disposed adjacent to the idle belt wheel 31b, a drive belt wheel 33b disposed downstream of the punching device 5, and a guide roller 34b disposed adjacent to the drive belt wheel 33b. And an endless rail or endless belt 3 hung on a play and drive belt wheel
5b. As shown in detail in FIG. 6, the endless belt 35b is a toothed belt or a timing belt in which teeth are provided at regular intervals along the longitudinal direction, and each belt wheel has a tooth meshing with the teeth of the timing belt. Is a toothed belt wheel formed on the outer periphery. In the endless belt 35b, holes 36b penetrating vertically are formed along the longitudinal direction of the endless belt at the same interval as the interval between the engagement protrusions of the endless belt 35a.

The endless belts 35a and 35b are shown in FIG.
As can be seen from FIG.
b and 33a, 33b and guide rollers 32a, 32
Due to the positional relationship between b and 34a, 34b, the going side and the returning side are parallel to each other, and the part where the going side and the returning side are parallel is a guide frame arranged along the transport path of the packaging film. 37 (37a, 37
b). Each endless belt 3
In order to prevent slackness in 5a and 35b and to move in parallel with each other, guide plates 38a and 38b are provided between the going side and the returning side as shown in FIG.
May be arranged at predetermined intervals (or over the entire length of the section where the belt is parallel), and the guide plates may be fixed to the guide frame.

In the moving guide device 30 having the above-mentioned structure, the pocket-shaped or concave-shaped receiving portion 41 is also formed along the longitudinal direction of the container film by a molding device (not shown) for forming a container, ie, a pocket p, in the container film. And are formed together at the predetermined intervals. The endless belts 35a and 35b intermittently move at a predetermined pitch in synchronization with each other. When the container film filled with the goods in the pocket p and covered with the cover film arrives between the upper portion 30a and the lower portion 30b, the engaging protrusion 36a attached to the endless belt 35a of the upper portion 30a. There container film f ₁ enters the formed receiving portion 41 (width receiving portion is narrower than the width of the container film of the cover film are not covered by the cover film), and the receiving portion 41 is the lower part 30b Endless belt 35
In the state of entering the hole 36b, the edge of the packaging film is sandwiched between the end sides of the endless belts 35a and 35b. In this state, the packaging film is moved upward and downward by the movement guide devices 30a and 30b.
Is moved intermittently toward the downstream side by the movement of the endless belt. Therefore, the packaging film is conveyed at the same speed as the moving speed of the endless belt, and the edge portion is prevented from being displaced in the width direction of the film by the endless belt. The width of the cover film is the same as the width of the container film and the receiving portion 4
When 1 is covered with the cover film, the engaging projection 36a breaks the cover film and enters the receiving portion 41.

Next, the overall operation of the bending prevention device 10 of the present embodiment will be described. The upper portion 30a and lower portion 30b of the moving guide 30 is arranged on each side of the packaging film, packaging film f made of container film f ₁ and the cover film f ₂ Metropolitan is transferred as described above seal device 1 , The two films are thermally bonded by the sealing device. When the thermal bonding by the sealing device 1 is completed, the packaging film is sent to the position of the cooling device 20 arranged on the downstream side. At this position, the cover film side of the packaging film comes into contact with the cooling surface 26a of the cooling tank 23, and is rapidly cooled from the cover film side. In this case, the cooling surface 26a
Due to the curved shape, the sheet is rapidly cooled from the cover film side in a state of being curved in a direction opposite to the Y curl shown in FIG. For this reason, even when the packaging film is separated from the cooling device, the packaging film maintains this curved shape even if it is slight. Thereafter, it is sequentially and intermittently transported to the downstream side by the movement guide device, and the perforations are formed by the perforation forming devices 2 and 3 disposed downstream of the cooling device. It is punched as a packaging sheet by the device 5. Even when the packaging sheet is punched out of the packaging film, it has a substantially flat shape at room temperature.

In FIG. 8, a part of another embodiment of the movement guide device is indicated by 30a '. In the movement guide device of this embodiment, a combination of an idle belt wheel, a drive belt wheel, an endless belt and the like is arranged only on one side (upper side in this example) of the packaging film f, and the other side (lower side) of the packaging film f Only the guide rails for supporting the film from below are arranged in (). That is, the movement guide device 3
0a 'is a part 30a' having the same structure as the upper part 30a of the above-mentioned embodiment, which is disposed on the upper side of the film;
a ′ and a guide rail 50 disposed on the opposite side (lower side) of the film. Guide rail 5
Pocket-shaped receiving part 4 formed on the container film
1 is formed over the entire length. The structure of the upper portion 30a 'may be exactly the same as the structure of the upper portion 30a in the above embodiment, and a detailed description thereof will be omitted.

In the above embodiment, the moving guide device is provided entirely between the position upstream of the sealing device and the position downstream of the punching device, and the transfer of the packaging film is performed by the moving guide device. However, the packaging film may be transported by another pulling type feed device provided downstream or upstream of the punching device, in which case the moving guide device is provided only on both sides of the cooling device. The endless belt may be provided to move in accordance with the feed speed of the feed device. Further, in the above embodiment, the receiving portion 41 formed in the container film has a pocket shape, but may be constituted by a simple hole penetrating the film.

[0021]

According to the anti-curl device of the present invention, the packaging film is rapidly cooled in a state in which it is curved in a direction opposite to the so-called Y curl after the sealing is completed. The occurrence of the curve along is suppressed. Further, since the packaging sheet is prevented from being curved, the handling of the sheet in the subsequent process is facilitated.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an entire configuration of a packaging machine provided with an embodiment of a packaging sheet bending prevention device of the present invention.

FIG. 2 is an enlarged side elevation view of a cooling device in the bending prevention device of FIG. 1;

3 is a top plan view of the cooling device of FIG. 2,

FIG. 4 is a front view of the cooling device of FIG. 2;

5 is an enlarged sectional view showing a part of a cooling tank of the cooling device of FIG. 5;

FIG. 6 is an enlarged partial side view showing a relationship between an endless belt of an upper portion and a lower portion of the movement guide device of the embodiment of FIG. 1 and a receiving portion formed on a packaging film.

FIG. 7 is an enlarged cross-sectional view showing a state in which the edge of the packaging film is conveyed by endless belts at an upper portion and a lower portion of the movement guide device.

8A is a diagram showing another embodiment of the movement guide device, which is similar to FIG. 6, and FIG. 8B is a line B- of FIG.
It is sectional drawing along B.

FIG. 9 is a diagram illustrating a Y curl of a packaging sheet.

FIG. 10 is a view showing an X-curl of a packaging sheet.

FIG. 11 is a diagram illustrating a state in which a packaging sheet on which a Y curl has occurred is transported.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Sealing device 2, 3 Perforation forming device 4 Marking device 5 Punching device 10 Curvature prevention device 20 Cooling device 23 Cooling tank 26a Cooling surface 30, 30 'Movement guide device 30a, 30b Parts 35a, 35b
Endless belt 36a Engaging member 36b Hole 30a 'part

Claims (6)

[Claims] 1. A pocket is formed in a strip-shaped container film, an article is filled in the pocket, a cover film is put on the container film, and both films are thermally bonded by a sealing device. Then, the film is formed by a punching device. A packaging sheet in a packaging machine for punching a packaging sheet of a desired size into a packaging sheet, wherein the cooling apparatus is disposed downstream of the sealing apparatus and is in contact with a sealed cover film to cool both films. A cooling device having a cooling surface curved in a convex shape toward the pocket side when viewed in the width direction of the film; and a cooling device arranged on both sides of the cooling device to engage with a side portion of the film and A movement preventing device for regulating the displacement of the film in the width direction and moving in the longitudinal direction of the film together with the film. 2. The packaging sheet bending prevention device according to claim 1, wherein at least the container film has receiving portions formed on both sides at predetermined intervals along a longitudinal direction of the film. An endless rail that moves along the longitudinal direction of the film, and an engagement member attached to the endless rail at the predetermined interval are provided, and the engagement member is received in a receiving portion of the film. A device for preventing the bending of packaging sheets. 3. The packaging sheet bending prevention device according to claim 2, wherein a pair of endless rails arranged on each side of the film are arranged vertically above and below the film, and the engaging member is one endless end. A device for preventing the bending of a packaging sheet which is attached to a rail and has a hole formed in the other endless rail for receiving the engaging member, and moves with the film while sandwiching the edge of the film between the pair of endless rails. 4. The device for preventing bending of a packaging sheet according to claim 2, wherein the endless rails arranged on each side of the film are arranged on one of the upper side and the lower side of the film. A device for preventing bending of a packaging sheet, on the side of which a guide rail for guiding and sandwiching the film in cooperation with the endless rail is arranged. 5. The packaging sheet bending prevention device according to claim 1, wherein the movement guide device is located between a position upstream of the sealing device and a position downstream of the punching device. A device for preventing the wrapping of the packaging sheet, which is also provided between the sealing device and the punching device. 6. The device for preventing bending of a packaging sheet according to claim 1, wherein the movement guide device is disposed only on both sides of the cooling device, and the conveyance of the film is defined by the movement guide device. A device for preventing the packaging sheet from being bent using a separate device.