JP3212289B2 - Breathable packaging bag and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a breathable packaging bag which can be sold over the counter in a state in which products which require particularly breathability, such as fresh fruits and vegetables, are stored, and a method for producing the same.

[0002]

2. Description of the Related Art Small vegetables such as green soybeans and okra and small fruits such as kumquat (collectively referred to as fresh fruits and vegetables including such vegetables and fruits) are stored in a packaging bag and sold over the counter. Therefore, it is necessary to guarantee air permeability in order to maintain freshness. For this reason, conventionally, there has been provided a tubular bag formed of a net tube having a stretchable mesh in which a large number of monofilament-shaped filaments are crossed and integrated.
That is, while cutting the net tube to a predetermined length, forming a tubular bag having a bottom by bundling and welding one end, storing fruit and vegetables in the tubular bag, and then stapling the paper header. This closes the opening of the tubular bag. However, since such a tubular bag is formed in a tubular shape, it swells in a radial direction in a state in which fruits and vegetables are stored, and the appearance for displaying products is not good.

[0003] By the way, the present applicant has proposed various types of packaging bags which can be sold over the counter in a state in which various small articles are stored. Such packaging bags include a front film made of a synthetic resin film and a front film made of a synthetic resin film. A substantially rectangular bag is constructed by fusing and welding the back film,
If necessary, a hanging header is provided at the top of the bag.
Therefore, the bag body swells in both front and back directions in a state in which the product is stored, thereby distorting the peripheral edge. However, the peripheral edge can be generally maintained in a shape close to the original rectangle, so that the appearance for displaying the product is not bad. However, when such a packaging bag is used as a packaging bag for fresh fruits and vegetables as described above, the stored fresh fruits and vegetables are hermetically sealed, poor in air permeability, and quickly deteriorated in freshness. That is, fresh fruits and vegetables maintain their freshness by respiration, and if the air permeability is impaired, they deteriorate early.

[0004]

Accordingly, the present inventors, when forming a packaging bag for fresh fruits and vegetables, constituted a net sheet portion made of synthetic resin on both sides of the bag body, and formed a net sheet portion on both front and back sides. If a substantially rectangular bag body is formed as a whole by welding, necessary and sufficient air permeability is guaranteed, and the appearance appearance in the product storage state as described above is good,
We have learned that we can provide an ideal packaging bag for fresh fruits and vegetables.

[0005] Then, when a material usable for the synthetic resin net sheet constituting such a packaging bag was searched, the following problems were further found. (1) Fresh fruits and vegetables as described above are relatively small bulk goods, but due to the packaging of fixed quantities, the packaging bag easily swells when the goods are stored from a flat state, ideally a net. It is desirable that the part expands and contracts. Therefore, if you use a synthetic resin net sheet that constitutes a stretchable mesh made by intersecting and integrating a large number of monofilament-shaped filaments, if both front and back net sheet parts are polymerized, both sides are fused and welded It has been found that a bag that meets this requirement can be provided. However, when products are actually stored in a packaging bag made with such a net sheet, the fusing and welding parts of the front and back net sheets are easily peeled off, and it turns out that it is completely unusable. did. (2) Regarding the bag making method, as in the case of the conventional film bag, after the band-shaped net sheet is polymerized half-fold in the band width direction, the sheet is formed at predetermined intervals in the longitudinal direction of the half-folded net sheet. A technique for fusing and welding the front and back net sheet portions in the width direction is expected. According to this, bag production with high productivity can be performed. However, since the net sheet constituting the mesh composed of the monofilament-like filaments is rich in elasticity and extremely low in shape retention, it is extremely difficult to fold the strip-shaped net sheet in half. In particular, since the mesh is easily deformed while expanding and contracting at the time of half-folding, the facing edges of the folded net sheet are not aligned in a straight line with each other, and it is extremely difficult to form a bag of a desired form. is there.

[0006]

SUMMARY OF THE INVENTION The present invention provides a breathable packaging bag which solves the above problems and a method for producing the same.

[0007] Therefore, the net sheet where breathable packaging bag of the present invention is configured as means, placing the front and rear net sheet portions 2 made of synthetic resin across the article storage compartment 4
22 is intermittently transferred and cut along the cutting line C.
And a net welding wire 6 for welding the two net sheet portions 2 to each other is formed on both side edges of the bag 1, and the opening of the bag 1 is formed. 8, the opening edge 3a of the back net sheet portion 3 among the opening edges 2a, 3a formed by the facing edges of the front and back net sheet portions 2, 3 facing
A sealing piece 9 made of a synthetic resin film extending upward is welded to the outside of the opening edge 3a through a sealing piece welding wire 10, and a receiving piece made of a synthetic resin film is attached to the opening edge 2a of the front net sheet portion 2. 13 is welded to the outside of the opening edge 2a via a welding piece welding wire 14, wherein the front and back net sheet portions 2, 3 have a large number at a portion facing the article storage chamber 4. While forming a stretchable mesh in which the filaments 15 of the monofilaments are crossed and integrated, the net welding wires 6 and 6, the sealing piece welding wire 10 and the receiving piece welding wire 14 are formed.
In the part located at, heat the filament 15 until it is flattened.
By pressing, the ribbon portion 17 is formed, and the net welding lines 6, 6 are connected to the ribbon portions 1 of the front and back net sheet portions 2, 3.
7 are welded to each other, the sealing piece welding wire 10 is formed by mutually welding the ribbon portion 17 of the back net sheet part 3 and the sealing piece 9, and the receiving piece welding wire 14 is The present invention is configured such that the ribbon portion 17 and the receiving piece 13 of the front net sheet portion 2 are welded to each other.

Further, where the manufacturing method of breathable packaging bag of the present invention is configured as means, a number of monofilaments
Stretchable mesh that crosses and integrates the filament 15
The front and back net sheet portions 2 and 3 constituting the
Transporting the 3b in an aligned state, and a back net sheet portion
3. A belt-like film 24 is superimposed on the outside of the opposing edge 3b
Along with the sealing piece welding wire 10 to form the band-shaped filler.
When the sealing piece 9 is formed by the system 24, the sealing piece is welded.
The fibrous line 15 of the back net sheet part 3 at the position located on the line 10
Is formed into a flat ribbon portion 17, and the ribbon portion 17 and
A step of welding the strip films 24 to each other;
The tape film 2 is provided on the outside of the facing edge 2b of the sheet portion 2.
6 is polymerized and welded through the welding wire 14 of the receiving piece.
In forming the receiving piece 13 by the tape film 26,
The front net sheet portion 3 is located at a position located at the welding wire 14 of the receiving piece.
The ribbon portion 17 is formed by flattening the filament 15 of the ribbon.
To weld the connecting part 17 and the tape film 26 to each other
And a predetermined interval in the longitudinal direction of the front and back net sheet portions 2 and 3
The front and back net sheets 2 and 3 are welded in the band width direction
In forming the net welding wire 6 to be formed,
6 and the line 1 of the front and back net sheets 2 and 3
5 is formed into a flat ribbon portion 17, and the ribbon portion 1 is formed.
A step of planarly welding 7 and 17 to each other;
Front and back net sheet portions 2 and 3, band-like film 24 and tape
Of the net welding wire 6 with the width W
By dividing along the dividing line C located at the center,
The point is to get body 1 .

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings.

[Embodiment of Breathable Packaging Bag] As shown in FIG. 1, the bag body 1 has an article storage chamber 4 between a front net sheet portion 2 and a back net sheet portion 3 arranged on both front and back surfaces. Further, net welding lines 6, 6 for welding the two net sheet portions 2, 3 to each other are provided at both side edges of the bag body 1.

In the illustrated example, the front and back net sheet portions 2, 3
Is a form in which one net sheet is folded along the bottom 7 of the bag body 1, and the front and back net sheet portions 2 and 3 are formed by two separate front and back net sheets, respectively. By providing welding lines similar to the net welding lines 6 on both side edges of the body 1 on the bottom 7 of the bag body 1, three sides except for the tops of the front and back net sheet portions 2 and 3 may be welded.

The front and back net sheet portions 2 in a folded state,
3 have opening edges 2a, 3a aligned in a straight line with each other, whereby the article storage chamber 4
Opening 8 is formed.

An opening edge 3a of the synthetic resin film extending upward is provided at an opening edge 3a of the back net sheet portion 3, and the sealing piece 9 is opened in a state of being superposed on the outside of the back net sheet portion 3. A sealing piece welding wire 10 to be welded in the width direction of the edge 3a is formed. An adhesive layer 12 made of a pressure-sensitive adhesive covered with a release film 11 is provided near the free end of the sealing piece 9.

At the opening edge 2a of the front net sheet portion 2, a receiving piece 13 made of a synthetic resin film is provided, and the receiving piece 13 is superposed on the outside of the opening edge 2a in the width direction of the opening edge 2a. Is formed with a welding wire 14 for welding.

Therefore, after the release film 11 is peeled off,
The opening 8 can be closed via the sealing piece 9 by bending the sealing piece 9 and bonding the adhesive layer 12 to the outer surface of the receiving piece 13. At this time, instead of providing the adhesive layer 12 with the release film 11 on the sealing piece 9,
3 may be provided. In addition, a known chuck tape may be provided instead of the opening / closing fixing means using the adhesive layer 12.

As shown in FIG. 2 and FIG. 3, the front and back net sheet portions 2 and 3 are extendable and contractible by intersecting and integrating a large number of monofilament filaments 15 having a substantially circular or elliptical cross section. Construct a sheet with a mesh.

Therefore, the front and back net sheet portions 2 and 3 constitute a thread portion 16 having a substantially circular or elliptical cross section by the wire 15 at a portion facing the article storage chamber 4.
At portions located at the welding lines 6, 6, 10, and 14, a ribbon portion 17 having a flat filament 15 is formed. Such a ribbon portion 17 is positioned at the welding line and pressed by a heating body such as a hot plate until the filaments 15 constituting the front and back net sheet portions 2 and 3 are formed into a flat sheet-like ribbon shape. It is formed by continuing.

The ribbon portions 17 formed on the both side edges of the bag body 1 at the net welding lines 6, 6 are shown in FIGS. 2 and 3, and are positioned at the receiving piece welding line 14 of the receiving piece 13. The formed ribbon portion 17 is shown in FIG. Although the sealing piece welding wire 10 of the sealing piece 9 is not shown, a similar ribbon portion 17 is formed.

As shown in FIG. 3, the net welding lines 6, 6 formed on both side edges of the bag 1 are connected to the front and back net sheet portions 2, 3, respectively.
Are welded in a state in which the grid-like ribbon portions 17 in which the filaments 15 are formed flat are superimposed on each other, and are firmly connected not by linear welding but by planar welding. Such welding is achieved by crimping a heating body such as a hot plate from both the front and back surfaces with the net welding wires 6 interposed therebetween.

As shown in FIG. 2, the welding wire 14 formed on the receiving piece 13 is heated from the outside of the receiving piece 13 by heating the hot plate or the like from the outside of the receiving piece 13 with the receiving plate inserted inside the front net sheet portion 2. It is formed by pressing the body, whereby the receiving piece 13 is welded to the wire 15 located on the receiving piece welding wire 14 while compressing and deforming the wire 15 to form a flat ribbon portion 17. Then, a planar welding connection between the receiving piece 13 and the ribbon portion 17 is achieved. Although not shown, the sealing piece welding wire 10 of the sealing piece 9 is similarly heated from the outside of the sealing piece 9 by a heating element such as a hot plate with the receiving plate inserted inside the back net sheet portion 2. It is formed by pressure bonding, and achieves a planar welding connection between the sealing piece 9 and the ribbon portion 17.

[Embodiment of Bag Making Method] In the case of the illustrated embodiment, a net tube 18 as shown in FIG. 4A is used as a material for forming the front and back net sheets 2 and 3 of the bag 1. Can be Net tube 18
Constitutes a stretchable mesh formed by intersecting and integrating a large number of monofilament filaments 15 having a substantially circular or elliptical cross section as described above, and is integrally formed as a flexible tube body. ing.

As shown in FIG. 5, such a net tube 18 is wound in a longitudinal direction so as to form a roll 18a. Therefore, the net tube 18 constituting the roll 18a is tightened in a flat and flat form, thereby forming fold curves 19 and 20 substantially parallel to two opposing sides of the flat tube, as shown in FIG. It has been impatient. That is, the filament 15 constituting the tube is bent at the folding curves 19 and 20 to have a bending habit. The net tube 18 wound around the roll 18a
When the bending habits of the folding curves 19 and 20 are not sufficient, the paper is fed and then passed through a pair of sandwiching rollers to form the bending curves 19 and 20 having a sufficient bending habit. May be.

Then, the net tube 18 having the folding curves 19 and 20 and having a flat and flat shape is fed out from the roll 18a in the longitudinal direction (net tube feeding step).

The net tube 18 fed from the roll 18a is cut by a cutting means 21 having a cutting blade or a low-temperature fusing blade.
And the incision means 21 causes one of the fold curves 20
As shown in FIG. 4 (B), the front and back net sheet portions 2 extending in a half-fold state from the other fold curve 19 are cut along
3 is formed to form a half-folded net sheet 22 (incision step). Net tube 18 and half-folded net sheet 22
Because, if tension is applied in the transport state, the entire mesh will be easily deformed by easily deforming the mesh,
The sheet is sent to the intermittent drive rollers 23, 23 without tension without passing through a tension applying roll such as a step roll, and is intermittently transported. For this reason, the half-fold net sheet 22 cut by the cutting means 21 does not cause distortion,
As a result, the opposing edges 2b, 3b of the front and back net sheet portions 2, 3 cut along the folding curve 20 are aligned in a straight line with each other.

In order to provide the sealing piece 9, as shown in FIG. 5, a strip film 24 is unwound from a roll 24a.
When passing through the intermittent drive roller 23, the facing edge 3b of the back net sheet portion 3 of the half-folded net sheet 22
(A belt-like film feeding polymerization step). As shown in FIG. 4B, the belt-shaped film 24 includes the adhesive layer 12 covered with the release film 11.
The belt-shaped film 24 fed from the roll 24a is
The intermittent drive rollers 23, 2 without applying tension
3, but may be passed through a step roll group 25 for intermittent feeding as shown by a chain line in the figure.

As shown in FIG. 5, when the tape film 26 is fed from the roll 26a and passed through the intermittent drive roller 23, as shown in FIG.
It is superposed on the outside of the facing edge 2b of the front net sheet portion 2 of the half-fold net sheet 22 (tape film feeding polymerization step). It is preferable that the tape film 26 fed from the roll 26a be sent to the intermittent drive rollers 23 without applying tension, but as shown by a chain line in FIG. You may let it go.

Therefore, the half-folded net sheet 22 having passed through the intermittent drive roller 23 is intermittently transferred from above and below with the tape film 26 and the band-shaped film 24 superposed thereon, and is heated by a heating plate 28 such as a hot plate, an ultrasonic wave or a high-frequency electrode. 29, the receiving piece welding wire 14 and the sealing piece 10 as described above are formed,
They are integrally joined (film welding wire forming step). At this time, as described above, the ribbon portion 17 is formed on the front and back net sheet portions 2 and 3 and is welded to the respective films 24 and 26 two-dimensionally.

Subsequently, the front and back net sheet portions 2 and 3 are arranged at predetermined intervals in the longitudinal direction of the half-folded net sheet 22 in the band width direction of the half-folded net sheet 22 by heating members 30 and 30 such as a hot plate and an ultrasonic or high-frequency electrode. Is formed, and the front and back net sheet portions 2 and 3 are integrally joined (a net welding wire forming step). Thus, the ribbon portion 17 is formed on the front and back net sheet portions 2 and 3, and the ribbon portion 1 is formed.
As described above, the parts 7 and 17 can be welded to each other. At this time, the facing edges 2b and 3b of the front and back net sheet portions 2 and 3 are covered with the tape film 26 and the band-shaped film 24, respectively. Each of the films 26 and 24 is also formed with the net welding wire 6 at the same time and is welded and integrated with the front and back net sheet portions 2 and 3.

Thereafter, by the dividing means 31, the combined body of the half-folded net sheet 22, the belt-like film 24 and the tape film 26 which is intermittently transferred is cut along the dividing line C located at the center of the width W of the net welding line 6. By dividing,
A bag 1 is obtained. The bag 1 is delivered to a predetermined position by a take-up conveyor 32. Although the cutting means 31 may use a cutting cutter, it is preferable to use a fusing blade.

[0030]

According to the breathable packaging bag of the present invention, it is possible to provide the bag body 1 having the front and back net sheet portions 2 and 3 on both sides sandwiching the article storage room 4, so that the bag 1 is particularly breathable such as fresh fruits and vegetables. The freshness of the product requiring the property can be suitably maintained, and in the product storage state, the bag body 1 swells on both the front and back surfaces and does not swell in the radial direction as in the conventional net tube bag, and the periphery thereof is somewhat increased. Although the warp is distorted, the entire periphery can be maintained in a shape close to the original rectangle, so that the appearance for displaying the goods is good.

In particular, since the front and back net sheets 2 and 3 form a stretchable mesh in which a large number of monofilament-shaped filaments 15 are crossed and integrated at a portion facing the article storage room 4, air permeability and air permeability are improved. At the same time, the product has good fit. In this regard, such a net material is conventionally considered to be unable to be firmly welded, but according to the present invention, the wire located at the net welding wire 6 Since the strip 15 is deformed from a monofilament to form a flat ribbon portion 17, and the ribbon portions 17, 17 of the front and back net sheets 2, 3 are welded to each other in a planar manner, sufficient mechanical strength is obtained. Has a remarkable effect in that a practical breathable packaging bag can be provided.

Further, according to the breathable packaging bag of the present invention, the film pieces 13 and 9 are polymerized on the opening edges 2a and 3a of the front and back net sheet portions 2 and 3, and the welding lines 14 and 10 are formed.
, A pair of film pieces 1
The opening 8 can be suitably sealed via the openings 3 and 9. When such film pieces 13 and 9 are provided, the welding lines 14 and 10 of the front and back opening edges 2a and 3a are also provided.
Monofilament filament 15
Is formed, and the front and back opening edges 2a,
Since the ribbon portion 3a is welded to the respective film pieces 13 and 9 in a planar manner, sufficient mechanical strength is satisfied.

At this time, the opening edge 3a of the back net sheet portion 3
A sealing piece 9 extending upward from the opening edge 3a is constituted by the film piece welded 10 to the opening piece 3; a receiving piece 13 is constituted by a film piece welded 14 to the opening edge 2a of the front net sheet portion 2; If the adhesive layer 12 for bonding the sealing piece 9 and the receiving piece 13 to each other in a state in which the sealing piece 9 is bent is provided,
It is possible to provide a bag in which the opening 8 can be freely opened and closed.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a breathable packaging bag of the present invention, wherein (A) is a front view and (B) is a longitudinal sectional view.

FIG. 2 is an enlarged front view showing a part of a breathable packaging bag.

FIG. 3 is an enlarged perspective view showing a part of a breathable packaging bag.

FIG. 4 shows an embodiment of the method for producing a breathable packaging bag of the present invention, wherein (A) is a perspective view showing a net tube,
(B) is a perspective view showing a state in which the strip film and the tape film are overlapped after cutting the net tube.

FIG. 5 is an explanatory view showing one example of a bag making machine for carrying out the method for producing a breathable packaging bag of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bag body 2 Front net sheet part 3 Back net sheet part 2a, 3a Opening edge 2b, 3b Opposing edge 4 Article storage room 6 Net welding line 8 Opening 9 Sealing piece 10 Sealing piece welding wire 13 Receiving piece 14 Receiving piece welding Wire 15 Monofilament-shaped filament 16 Thread 17 Ribbon 18 Net tube 19, 20 Fold curve 21 Incision means 22 Half-fold net sheet 28, 29, 30 Heating body 31 Breaking means

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B65D 30/06 B65D 33/01 B65D 33/22

Claims (2)

(57) [Claims] 1. A net sheet 22 having front and back net sheet portions 2 and 3 made of synthetic resin sandwiching an article storage room 4 therebetween.
By cutting off along the cutting line C
The resulting bag 1 is a net welding wire 6, which is located on both side edges of the bag 1 and welds the two net sheet portions 2, 3 to each other.
6, an opening edge 2a formed by opposing edges of the front and back net sheet portions 2, 3 facing the opening portion 8 of the bag body 1.
3a, a sealing piece 9 made of a synthetic resin film extending upward is attached to the opening edge 3a of the back net sheet portion 3.
Is welded to the outside through a sealing piece welding wire 10, and a synthetic resin film receiving piece 1 is attached to the opening edge 2 a of the front net sheet portion 2.
3 is welded to the outside of the opening edge 2a through a receiving piece welding wire 14, wherein the front and back net sheets 2 and 3 have a large number at a portion facing the article storage chamber 4. While forming a stretchable mesh in which the filaments 15 of the monofilament are crossed and integrated,
Is a flat umbilical 15 is a site located on the net weld lines 6,6 and sealing strips weld line 10 and the receiving piece weld lines 14
To form a ribbon portion 17 by heating and pressing until the net welding lines 6 and 6
The sealing piece welding wire 10 is formed by welding the ribbon part 17 of the back net sheet 3 and the sealing piece 9 to each other, and the receiving piece welding wire is formed by welding the ribbon piece 17 to each other. Numeral 14 is a ventilated packaging bag, which is formed by welding the ribbon portion 17 of the front net sheet portion 2 and the receiving piece 13 to each other. 2. A step of transferring the front and back net sheets 2, 3 constituting a stretchable mesh formed by intersecting and integrating a large number of monofilament strips 15 with the opposed edges 2b, 3b aligned. A belt-like film 24 is polymerized on the outside of the facing edge 3b of the back net sheet portion 3 and is welded via a sealing piece welding wire 10, and when the sealing piece 9 is formed by the belt-like film 24, the sealing piece welding is performed. A ribbon portion 17 is formed by flattening the line 15 of the back net sheet portion 3 at the portion located at the line 10,
A step of welding the ribbon portion 17 and the band-shaped film 24 to each other; and a step of polymerizing the tape film 26 on the outer side of the facing edge 2 b of the front net sheet portion 2 and welding the tape film 26 via the receiving piece welding wire 14. When the receiving piece 13 is formed by 26, a ribbon portion 17 is formed in which the linear portion 15 of the front net sheet portion 3 is flattened at a portion located at the receiving piece welding wire 14,
A step of welding the ribbon portion 17 and the tape film 26 to each other; and a net welding wire for welding the front and back net sheet portions 2 and 3 in the band width direction at predetermined intervals in the longitudinal direction of the front and back net sheet portions 2 and 3. When forming the ribbon portion 6, a ribbon portion 17 having a flat line 15 of the front and back net sheet portions 2, 3 is formed at a portion located at the net welding line 6, and the ribbon portions 17, 17 are formed.
And a step of welding the surfaces of the front and back net sheets 2 and 3 and the strip film 24.
And the tape film 26 is connected to the net welding wire 6.
The method for producing a conductive packaging bag according to claim 1, wherein the bag body 1 is obtained by cutting along a cutting line C located at the center of the width W of the bag.