JP3464179B2 - Breathable packaging bag for storing fresh fruits and vegetables - Google Patents

Description

Description: 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. 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 in a fixed amount. It is desirable to sell them over-the-counter, and it is necessary to guarantee air permeability 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] Therefore, the present inventors, when forming a packaging bag for fresh fruits and vegetables, constituted both sides of the bag body with a net sheet portion made of synthetic resin, and formed a front and back net. If a substantially rectangular bag body is formed as a whole by welding the sheet portion, the 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 using 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 they can not withstand use at all. 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 formed of the monofilament-shaped filaments as described above 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 opposing edges of the folded net sheet are not aligned in line with each other, and it is extremely difficult to form a bag of a desired form. is there. SUMMARY OF THE INVENTION [0006] The present invention provides a breathable packaging bag for storing fresh fruits and vegetables which has solved the above-mentioned problems. In view of this, the breathable packaging bag for storing fresh fruits and vegetables according to the present invention is configured as means by disposing front and back net sheet portions 2 and 3 made of synthetic resin with the article storage room 4 interposed therebetween. The opening edge 3 of the back net sheet portion 3
Outside of a, a sealing made of a synthetic resin film extending upward.
The piece 9 is polymerized and the sealing piece is melted in the width direction of the opening edge 3a.
It is welded through the connecting wire 10 and the opening edge of the front net sheet portion 2 is opened.
On the outer side of 2a, a receiver made of a synthetic resin film extending upward.
The pieces 13 are superimposed and melted in the width direction of the opening edge 2a.
Welded through Chakusen 14, further before with welded to both net seat 2 mutually located on both side edges of the bag body 1
The sealing piece 9 is welded to both side edges of the back net sheet portion 3 and
A breathable packaging bag formed with net welding lines 6, 6 for welding the receiving pieces 13 to both side edges of the front net sheet portion 2 , wherein the net sheet portions 2, 3 are used for storing articles. extraordinary N to the chamber 4
In configure multiple monofilament-like stretchable mesh which the umbilical 15 was allowed integrally intersect, the sealing piece 9,
A lower edge 9a extending downward from the sealing piece welding wire 10 and a back net are provided.
A separation space S1 is formed between the seats 3 and the receiving piece 1 is formed.
3 is a lower edge portion 13a extending downward from the receiver welding wire 14;
The point is that a separation space S2 is formed between the front net sheet portions 2 . Further, the air-permeable packaging bag of the present invention is configured as a means in the embodiment, and the both sides of the bag body 1 in which the front and back net sheets 2 and 3 made of synthetic resin are disposed with the article storage chamber 4 interposed therebetween. , And a net welding wire 6 for welding the two net sheet portions 2 and 3 to each other is formed. A film piece 9 is superimposed on the opening edge 3a of the back net sheet portion 3 and is welded by the welding wire 10. A breathable packaging bag that is welded in the width direction of the opening edge 3a, a film piece 13 is superposed on the opening edge 2a of the front net sheet portion 2, and welded in the width direction of the opening edge 2a by a welding wire 14. In a portion where the net sheet portions 2 and 3 face the article storage room 4, a stretchable mesh is formed by intersecting and integrating a large number of monofilament filaments 15, while the net welding wire 6 is formed. , In addition, at the portions of the front and back opening edges 2a, 3a located at the welding lines 14, 10, a ribbon portion 17 having a flat line is formed, and the ribbon portion 17 is located at the net welding lines 6, 6, and the front and back net sheet portions are formed. 2 and 3 are welded to each other, and the ribbon portions 17 of the front and back opening edges 2a and 3a are welded to the respective film pieces 13 and 9 at the welding lines 14 and 10 of the front and back opening edges 2a and 3a. On the point. In addition, the welding 1 is applied to the opening edge 3a of the back net sheet portion 3.
The zeroed film piece constitutes a sealing piece 9 extending upward from the opening edge 3a, and the film piece welded to the opening edge 2a of the front net sheet portion 2 constitutes a receiving piece 13, and the sealing piece 9 It is preferable to provide an 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. 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 sides. The two net sheet portions 2, 3 are located on both side edges of the bag body 1.
Are welded to each other. 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. At the opening edge 3 a of the back net sheet portion 3,
A sealing piece 9 made of a synthetic resin film extending upward is provided, and a sealing piece welding wire 10 for welding the sealing piece 9 to the outside of the back net sheet portion 3 in the width direction of the opening edge 3a is formed. From the welding wire 10 of the sealing piece.
Edge 9a of the sealing piece 9 extending toward the rear and the back net sheet 3
A separation space S1 is formed therebetween . In addition, the sealing piece 9
An adhesive layer 12 made of a pressure-sensitive adhesive covered with a release film 11 is provided in the vicinity of the free end. At the opening edge 2 a of the front net sheet portion 2,
A receiving piece 13 made of a synthetic resin film extending upward is provided, and a receiving piece welding wire 14 for welding the receiving piece 13 to the outside of the opening edge 2a in the width direction of the opening edge 2a is formed. And a receiving portion extending downward from the receiving piece welding wire 14.
The space between the lower edge portion 13a of the piece 13 and the front net sheet portion 2 is separated.
An interspace S2 is formed . 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] The material for forming the front and back net sheet portions 2 and 3 of the bag body 1 is shown in FIG.
A net tube 18 as shown in FIG. As described above, the net tube 18 forms a stretchable mesh in which a large number of monofilament-shaped filaments 15 having a substantially circular or elliptical cross section are crossed and integrated, and as a flexible tube body. It is integrally molded. 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, ultrasonic wave or 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. According to the breathable packaging bag of the present invention, the bag body 1 having the front and back net sheet portions 2 and 3 on both sides sandwiching the article storage room 4 can be provided. In particular, the freshness of a product requiring air permeability can be suitably maintained, and when the product is stored, the bag body 1 does not swell in the radial direction as in a conventional net tubular bag, but swells on both sides. Is somewhat distorted, but as a whole the periphery can be kept close to the original rectangular shape, so that the appearance for displaying goods is good. In particular, since the front and back net sheets 2 and 3 constitute 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. The opening edges of the front and back net sheet portions 2 and 3
2a and 3a are each made of a synthetic resin film from the outside.
Although it is configured to be covered by the receiving piece 13 and the sealing piece 9,
Lower edges 13a and 9a of each film and front and back nets
Separated spaces S2 and S1 were formed between the sheet portions 2 and 3.
The composition ensures the necessary ventilation for fresh vegetables.
There is a remarkable effect in that it is possible to provide a practical breathable packaging bag that has been kept. According to the above embodiment, the film pieces 13 and 9 are superposed on the opening edges 2a and 3a of the front and back net sheet portions 2 and 3 and are welded by the welding wires 14 and 10, respectively. It is possible to suitably seal the opening 8 through the film pieces 13 and 9. When such film pieces 13 and 9 are provided, a ribbon portion 17 having a flat monofilament-like filament 15 is formed at a position of the front and back opening edges 2a and 3a located at the welding lines 14 and 10, and the front and back sides are formed. Since the ribbon portions 17 of the opening edges 2a and 3a are 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. When a bag-like net 1 is formed by half-folding a band-like net sheet in the band width direction as in the case of a conventional film bag, the net sheet is easily formed at the time of folding. Deformation does not align the opposing edges of the folded net sheet with each other in a straight line, making it difficult to form a desired bag. With this configuration, a tubular net tube 18 is used instead of a belt-like net sheet, and the net tube 18 is extended in the longitudinal direction (net tube extending step), and thereafter, the net tube 18 is cut along the longitudinal direction. To form the half-folded net sheet 22 having the front and back net sheet portions 2 and 3 in the half-folded state in which the facing edges 2b and 3b are formed (cutting step). Against 22, a pair of opposed edges 3
The films 24 and 26 are polymerized on the b and 2b, respectively (film feeding polymerization step), and the films 24 and 26 are welded to the facing edges 3b and 2b by the welding wires 10 and 14 formed in the respective polymerization portions (welding wire). Forming step), the obtained half-folded net sheet 22 is not distorted, and the cut-out front and back net sheet portions 2 and 3 are provided with the facing edges 3b provided with the films 24 and 26.
2b are aligned in a straight line with each other, and the bag 1 completed through various processes including a net welding wire forming process and a cutting process has a remarkable effect of high quality and high accuracy.

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 the net tube is cut. FIG. 5 is an explanatory view showing an example of a bag making machine for carrying out the method for producing a breathable packaging bag of the present invention. DESCRIPTION OF SYMBOLS 1 Bag 2 Front net sheet part 3 Back net sheet part 2a, 3a Opening edge 2b, 3b Opposite 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 filament 16 thread 17 ribbon 18 net tube 19,20 fold curve 21 incision means 22 half-fold net sheet 28,29,30 heating element 31 dividing means

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

Claims (1)

(57) [Claim 1] In the bag body 1 in which the front and back net sheets 2 and 3 made of synthetic resin are arranged with the article storage chamber 4 interposed therebetween,
Outside the opening edge 3a of the seat sheet portion 3 and extends upward.
The sealing piece 9 made of a synthetic resin film is polymerized and the opening is formed.
Welded in the width direction of the edge 3a via the sealing piece welding wire 10,
It extends upward outside the opening edge 2a of the net sheet portion 2.
The synthetic resin film receiving piece 13 is polymerized and opened.
Welded in the width direction of the rim 2a via the welding wire 14 for the receiving piece,
The two net sheet portions 2, 3 located on both side edges of the bag 1
And the sealing piece 9 is attached to the back net sheet.
The receiving piece 13 is welded to both side edges of the part 3 and the receiving piece 13 is
A breathable packaging bag obtained by forming a net weld lines 6,6 to weld the opposite side edges of the isolation portion 2, said net seat 2 and 3, the multi <br/> number Nde extraordinary in article storage chamber 4 under the monofilament-like filament 15 constitute a stretchable mesh which was allowed integrally intersect, the sealing piece 9, which extends from the sealing strip weld lines 10 downwardly
A separation space S1 is formed between the edge portion 9a and the back net sheet portion 3.
And a lower edge of the receiving piece 13 extending downward from the receiving piece welding wire 14.
A space S2 is formed between the portion 13a and the front net sheet portion 2.
A breathable packaging bag for storing fresh fruits and vegetables, characterized by being formed .