JP2533038B2 - Manufacturing method of gusset bag with header - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a header-equipped gusset bag for packaging and hanging-displaying products.

[0002]

2. Description of the Related Art Conventionally, it has been known that a product packaging bag made of a plastic film is provided with a gusset by bending both side edges of the bag body inward in order to increase the packaging capacity of the bag body.

It is also known that a bag is provided with a header portion made of a thick sheet material for hanging and displaying the product in a store in a state of being packaged.

[0004]

Various proposals have been made for the method of manufacturing the above-mentioned bag body. For example, in order to manufacture a bag body with a gusset, a tube integrally formed by inflation molding or the like. Film is used. That is, in the process of transferring the tubular film, the gusset is formed by bending both side edges of the tubular body inward.

The method for forming a gusset using such a tubular film has the advantages that the steps are simple and the bag making line is simple. However, since the tubular film is generally expensive, there is a problem that the cost of the bag is increased. Also,
Since a tubular film is used as a material, a laminated film such as a dry laminate cannot be used, and there is a disadvantage that the film material is restricted. Furthermore, when manufacturing a printed bag body, it is necessary to send the film material before bag making to the printing machine for printing, but in the case of a tubular film, flatten the tube body and print. However, since it is impossible to perform printing on the entire tube body (the width of the flat body), there is a problem in that blank spaces with no printing occur on both sides of the printed portion.

In order to manufacture a bag with a header, a bag making method called side seal has been conventionally known.

According to such a side-sealing method, a wide band-shaped film and a narrow band-shaped sheet material are superposed and transferred in the same direction, and divided by a heat sealing means at right angles to the transfer direction, so that both sides are separated. It is possible to form a bag body whose edges are fused and welded. However, in order to manufacture the bag body with the gusset as described above, since the gusset must be formed by continuously bending the film material inward in the transfer direction while transferring the film material,
The sheet material for forming the header portion cannot be transported in the same direction as the film material. Therefore, in the bag making line for the bag with gusset, the sheet material for the header needs to be fed to the film material in a direction intersecting the transfer direction, and the sheet material needs to be polymerized and welded to the film material. . However, in this case, it is difficult to polymerize the header sheet material at a predetermined position of the film material in a predetermined direction, and there is a possibility that a poor quality header-equipped bag body may be formed due to a position shift or the like. is there.

[0008]

SUMMARY OF THE INVENTION The present invention provides a method of manufacturing a header-equipped gusset bag that solves the aforementioned problems.

Therefore, the present invention is configured as the first means, and a step of forming a tube body 4 having a welding line at one side edge by welding the open end of a half-folded strip-shaped film, A step of forming a gusset 4a by bending inward a side edge including at least a welding line of the tube body; and a thick sheet material 10 intermittently in a direction orthogonal to an intermittent transfer direction of the gusseted tube body. Sent to
A step of polymerizing the sheet material over the entire width of the tube body 4, and a tube over the entire width including the gusset 4a.
By means of heat sealing means 19 which is crimped onto the surface of the body 4, the tu
While welding the sleeve body 4 to the sheet material 10,
A step of forming the header portion 17 made of a sheet material piece by dividing the sheet material 10 along the side edge of the tube body, and dividing the tube body 4 in the width direction in the vicinity of the header portion 17 to form a bag. And the step of forming the body 24.

Further, the present invention is configured as a second means, and a step of forming a tube body 4 having welding lines on both side edges by welding the both side edges of two polymerized strip films. A step of bending both side edges of the tube body inward to form gussets 4a, 4a, and intermittently delivering a thick sheet material 10 in a direction orthogonal to the intermittent transfer direction of the gusseted tube body. and a step of polymerizing the sheet material over the entire width of the tube member 4, before
Tube body over the entire width including the gazette 4a, 4a
4 by means of heat sealing means 19 which is pressed onto the surface of
While welding the tube body 4 to the sheet material 10,
A step of forming the header portion 17 made of a sheet material piece by dividing the sheet material 10 along the side edge of the tube body, and the tube body 4 near the header portion 17.
Is divided in the width direction to form the bag body 24.

In the first and second means, the step of forming the header portion includes the step of pre-fixing the sheet material and the tube body with hot holes penetrating both the sheet material and the tube body, and then the sheet material and the tube body. It is preferable that the method comprises a step of completely fixing the heat-sealing means.

[0012]

Embodiments of the present invention will be described in detail below with reference to the drawings.

(First Embodiment) In a first embodiment shown in the drawings, a strip-shaped film 1 is adopted as a plastic film material for making a bag body. The strip-shaped film 1 may be either a composite film composed of two or more layers formed by dry lamination or the like, or a single film composed of a single layer. It is transferred and half-folded in the transfer process (half-fold process). Therefore, as shown in FIG. 1, the half-folded front film portion 1a and back film portion 1b are
Is configured. By the way, if necessary, the strip-shaped film 1
The surface of the film is printed, but at that time, it is possible to print on the entire surface of the band-shaped film 1, and compared with the case where the tubular film formed by the conventional inflation molding described above cannot be printed on the entire surface. It is advantageous.

As shown in FIG. 1, the half-folded strip-shaped film 1 is welded at the open ends of the front and back film portions 1a and 1b by a welding means 2 equipped with a fusing blade during the transfer process in the longitudinal direction of the strip. Tube body 4 with welding line 3 on one side edge
Are formed (tube body forming step). The welding means 2
May be welded only to the open edges of the front and back film portions 1a and 1b, but may be welded to the inside of the open edges. Alternatively, the welding means 2 may be provided with a fusing blade and a cutting blade so that the inside of the open end edges of the front and back film portions 1a and 1b are welded and the outside of the welding line is cut at the same time.

The tube body 4 further includes a side edge including at least the welding line 3 in the longitudinal transfer process.
In the illustrated example, both side edges are bent inward so that the gussets 4a and 4a are formed.
Are formed (step of forming a gusset). In order to form this gusset, for example, a gusset forming device including a receiving member 5 with a groove 5a and a pair of taper guide members 6 facing both sides of the groove 5a as shown in FIG. 1 is used. be able to. That is, the receiving member 5 is placed inside the tube body 4 via the support portion 5b, and the pair of taper guide members 6 and 6 are placed outside both sides of the tube body 4. Therefore, the tube body 4 to be transferred is narrowed on both side edges by the taper guide members 6 and bent inward,
A gusset 4a, 4a is formed by passing between the guide members 6, 6 and the groove 5a.

As shown in FIG. 2, the tube body 4 with a gusset formed as described above has intermittent transfer rollers 7, 8,
After passing through 9, the sheet is intermittently transferred, where the thick sheet material 10 is polymerized in the width direction of the tube body 4 (sheet material polymerization step). The sheet material 10 is a tape-shaped sheet material made of thick synthetic paper or a plastic sheet, and is unwound from the wound roll 10a in a direction orthogonal to the longitudinal direction of the tube body 4, Is polymerized over the entire width of. That is, the sheet material 10 is intermittently paid out by a distance equal to the width of the tube body 4.

With the sheet material 10 superposed on the tube body 4, the cylindrical hot blade 11 is lowered by the drive source 12 such as an air cylinder, and as shown in FIG. A hot hole 13 that penetrates through is formed (hot hole forming step). That is, by forming the heat holes 13 by the tubular hot blade 11, the sheet material 10 and the tube body 4 are welded 14 to each other at the peripheral edge of the heat holes 13, thereby pre-fixing (pre-fixing step). During this time, the tube body 4
Is in a stopped state.

Simultaneously with or before or after the hot hole forming step (preliminary fixing step), the sheet material cutting blade 15 (FIG. 2) is lowered by the drive source 16 such as an air cylinder, and the step shown in FIG.
As shown in FIG. 5, the sheet material 10 is divided along the side edge of the tube body 4 to form the header portion 17 (header portion forming step). During this time, the tube body 4 is in a stopped state. By the way, the sheet material 10 and the tube body 4
It is preferable to interpose a receiving plate 18 between
The receiving plate 18 receives the sheet material dividing blade 15 and thereby prevents the sheet material dividing blade 15 from cutting into the tube body 4 after cutting the sheet material 10. The sheet material dividing blade 15 is preferably a hot blade for fusing the sheet material 10, but may be a mechanically cutting blade. As described above, if the preliminary fixing step is performed before the header portion forming step, the sheet material 10 will not be displaced when the sheet material 10 is melted or cut.

Next, the tube body 4 with a header is
After being intermittently transferred, it is stopped, and the heat seal 19 (FIG. 2) is raised from below the tube body 4 by a drive source 20 such as an air cylinder, and as shown in FIG.
The tube body 4 is welded 21 and 21 along the side edge of 7 (complete fixing step). Also in this complete fixing step, since the header portion 17 and the tube body 4 are preliminarily fixed to each other by the preliminary fixing step, the header portion 17 and the tube body 4 are displaced from each other during the pressure bonding by the heat sealing means 19. It never happens. At this time, the complete fixing step
Is a heat-sealing means 19 including all gussets 4a, 4a.
Press it over the surface of the tube body 4 across the width and
The tube body 4 was welded to the sheet material 10 by
Therefore, in the header portion 17, the gussets 4a and 4a are
It becomes possible to integrally weld it to the sheet material 10.
That is, the tube body 4 has front and back films on both sides.
It is interposed between the parts 1a and 1b and the film parts 1a and 1b.
With the gusset 4a, it has a four-layer film structure.
However, as shown in FIG. 4 (A), the heat sealing means 1
9 toward the surface of the tube body 4 (in the direction of the arrow P in the drawing)
Since it is directly crimped, 4 of the gusset 4a portion
Sheet material 1 with the single-layer film laminated structure welded and integrated
Weld it to 0. In other words, contrary to the above,
Then, the heat sealing means 19 is pressure-bonded to the surface of the sheet material 10.
When welding to the tube body 4 while
As shown, heat sealing means through the thick sheet material 10.
The heat from 19 is not satisfactorily transferred to the gusset 4a.
Heat is generated in the gusset 4a part having the film laminated structure.
The welding is not good and the peeling piece 4b is generated as shown in the figure.
However, according to the present invention,
Enables integrated welding without the occurrence of peeling pieces 4b
Is advantageous in that

After or at the same time as the above-mentioned complete fixing step, the tube body dividing blade 22 (FIG. 2) is lowered by the drive source 23 such as an air cylinder, and as shown in FIG. 3 (C), The tube body 4 is divided near the header portion 17 to form the bag body 24 (bag body division forming step). This tube body dividing blade 22 constitutes, for example, a double blade composed of a fusing blade 22a and a cutting blade 22b as shown in FIG. 2, and as shown in FIG. 3 (C), the divided bag body 2
A welding line 25 and a cutting line 26 such as a perforation are formed on the bottom of No. 4. Therefore, after the bag body 24 is formed, the cutting line 2
By cutting 6 the bottom of the bag 24 can be opened. On the other hand, tube cutting blade 2
2 may be configured by a single blade that enables only mechanical cutting, and the bag body 24 may be configured to open simultaneously with the division.

(Other Embodiments) In the illustrated first embodiment, one strip-shaped film 1 is used as a film material for forming a bag, and the strip-shaped film 1 is half-folded and the open end is welded. Although the tube body 4 is formed by doing so, two strip-shaped films may be used in the present invention. In this case, while polymerizing the two strips of film,
A tube body is formed by welding both edges.
The gusset may be formed by bending both side edges including the welding line of the tube body inward, and the subsequent steps can be configured in the same manner as in the first embodiment.

[0022]

According to the present invention as set forth in claim 1 or 2, instead of using a conventional tubular film formed by inflation molding or the like, a tubular body is formed from a half-folded strip film, or Since the tube body is formed from two polymerized strip-shaped films, the material is inexpensive and can contribute to the cost reduction of the bag body.

As the film material, either a multilayer film such as a laminated film or a single layer film can be used, and the range of usable film materials is wide and the flexibility of the material is large.

Further, as described above, the entire surface cannot be printed by the conventional tubular film formed by inflation molding or the like, whereas the present invention enables the entire surface of the belt-shaped film to be printed. By the way, in order to form a tube body, a welding line must be provided, and the appearance of the printing is impaired at the portion of the welding line. However, according to the present invention, a tube body including the welding line is formed. Since the side edges are bent inward to form the gusset, the finally formed bag body has no appearance of the welding line portion and can maintain the appearance beauty.

Moreover, despite the bag body with such a gusset, the header portion made of a thick sheet material is used for the bag body.
It is possible to provide a bag body that can be provided over the entire width and that enables a heavy weight product that is packaged according to an increase in capacity due to a gusset to be more firmly hung and displayed by the header portion. Particularly, according to the present invention, while the tube body 4 is intermittently transferred in the longitudinal direction, the sheet material 10 is intermittently delivered in the direction orthogonal to the tube body 4, so that the tube body 4 and the sheet material are As a result of 10 being supplied from the orthogonal direction and being polymerized at the intersections thereof, the supply mechanism of the tube body 4 and the sheet material 10 has a simple structure and can contribute to space saving. That is, tentatively, in the mechanism for feeding the tube body and the sheet material from the same direction, after sending them from positions distant from each other, it is necessary to provide a guide for bringing them close to each other at a position to be polymerized. However, if the feed width of the tube body and the sheet material that are intermittently fed is not accurate and an error occurs, the error of both the tube body and the sheet material may be superimposed and a large error may appear, so the error is absorbed. It is necessary to form a long supply path for the tube body and the sheet material in order to interpose a mechanism for doing so, and there is a problem that the device becomes large. On the other hand, according to the present invention, since it is possible to supply the tube body 4 and the sheet material 10 under substantially the same horizontal level and polymerize them at the intersections, the tube body and the sheet material as described above are produced. It is possible to simply construct the structure of the supply mechanism without the need for a guide for gradually approaching. Moreover, since the tube body 4 and the sheet material 10 are intermittently fed in directions orthogonal to each other, even if an error occurs in the feed width, the errors are in different orthogonal directions, It does not show a large error due to the error of both the tube body and the sheet material as described above, and as a result, it is excellent in that the device can be downsized as a whole without the need to provide a mechanism for absorbing the error. ing. Change
In addition, according to the present invention, the tube body 4 and the sheet material 10 are melted.
When wearing, the heat sealing means 19 is attached to the gussets 4a, 4
Pressure bonding to the surface of the tube body 4 over the entire width including a
By welding the tube body 4 to the sheet material 10.
Therefore, the header portion 17 has a
The sheets 4a, 4a are integrally welded to the sheet material 10.
And become possible. In other words, if the heat sealing means 19 is
Weld to the tube body 4 while pressing it on the surface of the sheet material 10
If you want to squeeze, as shown in Figure 4 (B), fill four
In the gusset 4a, which has a laminated structure,
While there is a risk of peeling pieces 4b due to good quality,
According to the invention, the heat sealing means 19 allows the gusset 4a,
Sheet material 1 while directly crimping the tube body 4 including 4a
As shown in FIG. 4 (A), the
Welded and integrated the 4 film laminated structure of
It is possible to weld to the sheet material 10 in the closed state,
This is advantageous in that there is no risk of peeling pieces 4b.

According to the present invention of claim 3, in addition to the above effects, on the bag making line for the bag body with a gusset,
When the header sheet material is fed to the tube body in a direction intersecting the transfer direction and the sheet material is polymerized and welded to the tube body, first, it is preliminarily fixed by hot holes penetrating both the sheet material and the tube body. After that, since the sheet material and the tube body are then completely fixed to each other by heat sealing means, it is easy to properly polymerize the header sheet material at the predetermined position of the tube body, and quality due to misalignment etc. There is an effect that there is no risk of forming a defective bag with header.

[Brief description of drawings]

FIG. 1 is a half-folding step in the first embodiment of the method of the present invention,
It is a perspective view which shows a tube body formation process and a gusset formation process one by one.

FIG. 2 is a perspective view sequentially showing a sheet material polymerizing step, a hot hole forming step, a header forming step, a complete fixing step, and a bag dividing forming step in the first embodiment of the method of the present invention.

FIG. 3 shows states of respective steps after the sheet material polymerization step in the method of the present invention, (A) is a plan view showing states of a pre-fixing step by forming hot holes and a header part forming step, (B).
FIG. 6A is a plan view showing a state of a complete fixing process, and FIG.

FIG. 4 is a cross-sectional view showing a result of a complete fixing process,
(A) shows a tube body with a gusset according to the present invention.
Sectional view showing the state of welding to the welding material, (B) is based on the comparative example
Then, the tube body with gusset is welded to the sheet material.
FIG.

Claims (3)

(57) [Claims] 1. A step of forming a tube body (4) having a welding line on one side edge by welding an open end of a half-folded strip-shaped film, and a side edge including at least the welding line of the tube body. Forming a gusset (4a) by bending inward, and intermittently feeding a thick sheet material (10) in a direction orthogonal to the intermittent transfer direction of the gusseted tube body, The full width of the tube body (4)
A step allowed to over polymerization, the gusset to (4a)
Crimped to the surface of the tube body (4) over the entire width including
The tube body (4) is sealed by heat sealing means (19).
The sheet material (1) is welded to the sheet material (10) and
0) is divided along the side edge of the tube body to form a header portion (17) made of a sheet material piece, and the tube body (4) is divided in the width direction in the vicinity of the header portion (17). The bag (2
4) The method of manufacturing a gusset bag with a header, comprising: 2. A step of forming a tube body (4) having welding lines on both side edges by welding both side edges of two polymerized strip films, and folding both side edges of the tube body inward. The step of bending to form the gusset (4a, 4a), and the thick sheet material (10) is intermittently delivered in a direction orthogonal to the intermittent transfer direction of the gusseted tube body, and the sheet material is tubed. Polymerizing over the entire width of the body (4 ), including the gusset (4a, 4a)
A heat shield that is crimped over the width of the tube body (4).
The tube body (4) by a roll means (19).
While being welded to (10), the sheet material (10)
Forming a header portion (17) made of a sheet material piece by dividing the tube body along the side edge of the tube body, and dividing the tube body (4) in the width direction in the vicinity of the header portion (17). With bag (24)
A method of manufacturing a gusset bag with a header, comprising: 3. The step of forming the header portion, the step of pre-fixing with a heat hole (13) penetrating both the sheet material (10) and the tube body (4), and then the sheet material in the pre-fixed state. The method for producing a gusset bag with a header according to claim 1 or 2, comprising the step of completely fixing the tube body (4) and the tube body (4) to each other by means of heat sealing means (19).