JP2000255588A - Net bag and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically package fresh fruit vegetables in a net bag by constituting a sealing section wherein both header sheets can be welded to each other by an extended section which extends across the opening edge of a bag body, in the header sheets. SOLUTION: Front and rear header sheets 9 and 10 constitute a sealing section 14 wherein the header sheets 9 and 10 can be welded to each other by extended sections extending across the opening edges 2a and 3a of front and rear net sheet sections 2 and 3. Since an article insertion port 14a is provided between the front and rear header sheets 9 and 10, fresh fruit vegetables (article) can be easily inserted in a housing chamber 4 from the article insertion port 14a. For example, the article can be automatically inserted by an automatic inserting machine, or the article can be easily inserted by a manual work with workers. Then, after inserting the article, the sealing sections 14, 14 of the front and rear header sheets 9 and 10 are welded to each other. When being welded by an automatic sealing machine or the like, the welding is applied across the total width of a bag body 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Vegetables or fruits such as green soybeans, okra, shiitake mushrooms and garlic (collectively referred to as fresh fruits and vegetables including such vegetables and fruits) can be stored in a packaging bag and sold over the counter. Desirably, it is necessary to ensure air permeability for maintaining 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 freshness by respiration, and if the air permeability is impaired, they deteriorate early.

[0004]

By the way, the present inventors, when forming a packaging bag for fresh fruits and vegetables, comprise both sides of the bag body with a net portion made of synthetic resin and weld both the front and back net portions. By forming a substantially rectangular net bag as a whole, the necessary and sufficient air permeability is guaranteed, and the appearance and appearance of the above-described product storage state are good, and the ideal packaging bag for fresh fruits and vegetables. I know that I can provide.

[0005] Therefore, although various proposals have been made for the invention relating to the net bag, it has been found that there is an unsolved problem in automatically packaging fresh fruits and vegetables (hereinafter simply referred to as articles) in the net bag.

[0006]

SUMMARY OF THE INVENTION The present invention provides a net bag capable of automatic packaging. The first aspect of the present invention is a net bag made of synthetic resin which is disposed with an article storage chamber interposed therebetween. The front and back net sheet portions are positioned on both side edges of the bag body and welded to form a side seal portion.The net bag has a bottom portion at the bottom and an opening at the top portion. A header sheet made of a band-shaped synthetic resin sheet is attached to each of the front and back net sheet portions along the header sheet, and the header sheet can be welded to each other by an extension extending beyond the opening edge of the bag body. And at least one of the header sheets is provided with an openable portion which can communicate with the opening of the bag.

Accordingly, it is possible to easily store the articles by opening the space between the pair of header sheets, and the seal margin of the pair of header sheets is automatically sealed to each other while the articles are stored in the article storage chamber. It can be welded by a machine or the like and offered for sale. And since the net bag has at least one header sheet formed so as to be freely opened, a user who has purchased the bagged product can easily open it at home.

Further, the net bag of the present invention is constituted as a second means, in which the front and back net sheet portions made of synthetic resin arranged with the article storage chamber interposed therebetween are welded by being positioned on both side edges of the bag body. This is a net bag having a side seal portion formed by providing a bottom portion at the lower portion and an opening at the upper portion, and a header made of a band-shaped synthetic resin sheet on each of the front and back net sheet portions along the opening edge of the bag body. With the sheet attached, a receiving film made of a synthetic resin band-shaped film is welded along a front net sheet portion along the opening edge of the bag body, and a front header sheet is arranged so as to overlap the receiving film, The front header sheet and the receiving film are detachably fixed to each other via an adhesive layer, and the back header sheet is welded along the back net sheet portion along the opening edge of the bag body. Become Te, front and back header sheet,
An extension extending beyond the opening edge of the bag constitutes a seal margin that allows both header sheets to be welded to each other, and the bag is placed between the front header sheet and the receiving film via a peelable adhesive layer. The present invention is characterized in that an opening is provided with a freely openable portion that can communicate with the opening.

Further, the net bag of the present invention is configured as a third means, in which the front and back net sheet portions made of synthetic resin, which are arranged with the article storage chamber interposed therebetween, are positioned and welded to both side edges of the bag body. This is a net bag having a side seal portion formed by providing a bottom portion at the lower portion and an opening at the upper portion, and a header made of a band-shaped synthetic resin sheet on each of the front and back net sheet portions along the opening edge of the bag body. In the sheet which is welded, the header sheet constitutes a seal margin that allows both header sheets to be welded to each other by an extension extending beyond the opening edge of the bag body, and can be torn to at least one header sheet. The present invention is characterized in that an openable portion constituted by perforations is provided.

[0010] At this time, it is preferable to provide a perforation which is located below the seal margin and which can tear the pair of header sheets in the longitudinal direction of the band.

By the way, the method for manufacturing a net bag according to the present invention is constituted as a first means. In a process of transferring a net tube material made of synthetic resin, a shape retaining plate is inserted into the net tube material. While keeping the net tube material in a flat band-like tube shape, and transferring the net tube material in the longitudinal direction of the band with the shape retaining plate fixed, the net tube material is substantially centered in the band width direction via cutting means. A net sheet material forming step of obtaining a pair of opposed net sheet materials having front and back net portions bent in a substantially half-folded manner, and between the front and back net sheet portions of the pair of net sheet materials. By inserting both side edges of the guide plate into the belt and transferring both net sheet materials in the belt longitudinal direction with the guide plate fixed, A net sheet material control step of separating the two net sheet materials from each other in the band width direction along both side edges of the plate, and attaching a band-shaped receiving film along the cut edge of the front net sheet portion. A belt-shaped back header sheet is welded in the longitudinal direction of the band, and a strip-shaped back header sheet is attached along the back net sheet portion so that the cut edge of the back net sheet portion is located at the middle portion in the band width direction. A longitudinal direction welding step of welding the belt-like front header sheet from above the receiving film along the front net sheet portion so that the cut edge of the front net sheet portion is located at the middle portion in the band width direction. A belt-shaped body forming step of obtaining a belt-shaped bag structure by fixing the front header sheet to the receiving film via an adhesive layer,
Welding the bag structure in the band width direction at predetermined intervals in the band longitudinal direction to form a side seal portion in which the front and back net sheet portions of the pair of net sheet materials are welded to each other, and the side seal portion is formed. On the line, the receiving film and the front header sheet are not welded to each other, but the receiving film and the back header sheet are welded to each other with the front and back net sheet portions interposed therebetween to obtain a bag semi-finished product from the bag structure. It comprises a product forming step and a separating step of separating the semi-finished bag product from the bag structure by dividing the semi-finished bag product by being positioned on the line of the side seal portion.

Further, the method for manufacturing a net bag according to the present invention is configured as a second means. In a process of transferring a net tube material made of synthetic resin, a shape retaining plate is inserted into the net tube material. While keeping the net tube material in a flat band-like tube shape,
While the net tube material is transferred in the longitudinal direction of the band while the shape retaining plate is fixed, the net tube material is divided substantially at the center in the band width direction through cutting means, and the front and back net portions are bent substantially in half. A net sheet material forming step of obtaining a pair of opposed net sheet materials having: and both side edges of the guide plate were inserted between the front and back net sheet portions of the pair of net sheet materials to fix the guide plate. By transferring both net sheet materials in the belt longitudinal direction in the state, the net sheet material controlling step of separating both net sheet materials from each other in the band width direction along both side edges of the guide plate, and a belt-shaped front header sheet. The cut edge of the front net sheet portion is located at the middle portion in the band width direction, and the perforations formed in the longitudinal direction of the band of the front header sheet are cut out of the front net sheet portion. And attached along the front net sheet so as to be located outside the cut edge, and welded in the longitudinal direction of the band, and cut the back net sheet portion at the intermediate portion of the band in the width direction of the band. And along the back net sheet so that the perforated edge formed in the longitudinal direction of the back header sheet is located outside the cut edge of the back net sheet. A band forming step of obtaining a band-shaped bag structure by welding in the band longitudinal direction, and by welding the bag structure in the band width direction at predetermined intervals in the band longitudinal direction, a pair of net sheet materials To form a side seal portion in which the front and back net sheet portions are welded to each other, and to weld the front and back header sheets on both sides of the front and back net sheet portion on the line of the side seal portion. A bag blank forming step of obtaining a bag blank from bag structure Ri is the bag blank in a point comprising a separation step of separating from the bag structure by cutting and located on a line of the side seal portion.

[0013]

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

(First Embodiment of Net Bag) As shown in FIG. 1, the net bag 1 comprises an article storage room 4 between front and back net sheet portions 2 and 3 arranged on both front and back sides. Side seal portions 6, 6 are provided at both side edges of the first seal member 1 to weld the two net sheet portions 2, 3 to each other.

The front and back net sheet portions 2 and 3 are formed by folding a single net sheet body along the bag bottom 7, and the facing edges of the front and back net sheet portions 2 and 3 are aligned with each other in a straight line. The opening edges 2a and 3a are provided by aligning the openings, thereby forming the opening 8 of the article storage chamber 4.

Along the opening edges 2a, 3a, front and back header sheets 9, 10 made of strip-shaped synthetic resin sheets are attached to the front and back net sheet portions 2, 3, respectively.
A receiving film 11 made of a belt-like synthetic resin film is interposed between the front header sheet 9 and the front net sheet portion 2.

The receiving film 11 has sealing lines 11a, 1a, 1b extending toward the entire width of the bag 1 with respect to the front net sheet portion 2.
1a, the back header sheet 10 is welded to the back net sheet portion 3 by seal lines 10a, 10a extending toward the entire width of the bag 1, and the front header sheet 9 is adhered to the receiving film 11. It is detachably fixed via the agent layer 12.

As shown in FIG. 3, the front and back net sheet portions 2 and 3 are provided with a stretchable mesh formed by intersecting and integrating a large number of monofilament filaments 15 having a substantially circular or elliptical cross section. Make up the seat.

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 filament 15 at a portion facing the article storage room 4.
The seal lines 10a, 11a and the side seal portions 6,
The portion located at 6 constitutes a ribbon portion 17 in which the filament 15 is flattened. Such a ribbon portion 17 is formed by continuously pressing the filaments 15 constituting the front and back net sheet portions 2 and 3 until a flat sheet-like ribbon is formed by a heating element. Therefore, the side seal portions 6, 6
Since the ribbon portions 17 are mutually welded in a plane at
The front and back net sheet portions 2 and 3 are firmly welded. FIG. 3 illustrates the side seal portion 6 and a seal line 10.
Although a and 11a are not shown, it can be easily understood that they have the same configuration.

That is, the receiving film 11 is overlapped on the outer surface of the front net sheet portion 2 and the back header sheet 10 is overlapped on the outer surface of the back net sheet portion 3. By pressing the heating element so as to sandwich the whole, the sealing lines 10a and 11a which are linear in the width direction of the bag 1 are formed,
At this time, the ribbon portion 17 is welded to the film 11 and the back net sheet portion 3 while forming the ribbon portion 17 on the front and back net sheet portions 2 and 3.

When forming the side seal portions 6, the receiving film 1 is placed on a line along the side seal portions 6.
1 and front header sheet 9 and back header sheet 10
Are welded with the front and back net sheet portions 2 and 3 interposed therebetween. Therefore, the four layers of the ribbon portions 17 and 17 formed by the front and back net sheet portions 2 and 3 and the receiving film 11 and the back header sheet 10 sandwiching the ribbon portions 17 and 17 are integrated. Is welded. However, the front header sheet 9 and the receiving film 11 are provided with a welding prevention means so that they are not welded to each other. For example, the material itself of the front header sheet 9 and the receiving film 11 or, in the case of using a laminated film, the material facing each other may be made of mutually different synthetic resins, for example, one made of polyethylene and the other made of polypropylene. For example, even when the heating element is pressed from the outer surface of the front header sheet 9, the front header sheet 9 and the receiving film 11 are weakly welded to each other, but are easily peelable. Alternatively, for example, if a non-welding coating such as printing ink is applied to the mutually facing portions of the front header sheet 9 and the receiving film 11, even if the heating element is pressed from the outer surface of the front header sheet 9, And receiving film 1
1 are not welded to each other and can be peeled off.

However, in the present invention, the front header sheet 9 and the back header sheet 10 are configured to be weldable to each other, and therefore, in the area above the front and back net sheet portions 2, 3, the front and back header sheets 9, 10 are formed. Are formed on the line of the side seal portion 6 to form a welded portion 13 mutually.

Therefore, the front and back header sheets 9 and 10 are
Sealing margin 1 that can be welded to each other by extensions extending beyond the opening edges 2a, 3a of the front and back net sheet portions 2, 3.
4, the welding portion 13 is formed on both sides of the seal margin 14, and an article insertion opening 14 a is formed between the welding portions 13, 13 with the front and back header sheets 9, 10 opened. The front header sheet 9 constitutes a freely openable portion 18 that can be peeled off from the receiving film 11 via the adhesive layer 12.

According to the net bag according to the first embodiment, as shown in FIG.
Since the article insertion port 14a is provided between 10, the articles can be easily inserted into the storage chamber 4 from the article insertion port 14a. For example, an article can be automatically inserted by an automatic insertion machine, or an article can be easily inserted by a manual operation of an operator.

Therefore, after the article is inserted, as shown in FIG.
4 and 14 are mutually welded 19. When welding is performed by an automatic sealing machine or the like, welding 19 is performed over the entire width of the bag body 1.
Therefore, in this state, it is shipped as a bagged product.
It should be noted that the front and back header sheets 9 and 10 can be printed with a product display such as a trademark or a place of origin display.

When the user who purchased the over-the-counter bag-packed product is taken home and opened, the user can pull the openable portion 18 of the front header sheet 9 with a fingertip to open the adhesive layer 1.
When the front header sheet 9 is removed from the film 12 together with the front header sheet 2, the front header sheet 9 is opened to open the opening 8 of the bag body 1 as shown in FIG. I do. In the case of the illustrated example, the pressure-sensitive adhesive layer 12
Is provided on the side of the front header sheet 9, but may be provided on the side of the receiving film 12, in other words, it is sufficient that the front header sheet 9 and the receiving film 12 are provided mutually.

(Method of Manufacturing Net Bag According to First Embodiment) The net bag 1 as described above is automatically formed on a line by a bag making machine. Although each step is illustrated separately due to space limitations, it should be appreciated that the steps are continuous on a line.

(Process of Forming Net Sheet Material) FIG.
A step of forming a pair of net sheet materials 20a, 20a from a net tube material 20 made of synthetic resin is shown.

The net tube material 20 is composed of a net tube body having a stretchable mesh formed by intersecting and integrating a large number of monofilament-shaped filaments, and is fed out from a wound roll 20b. After the transfer direction is changed through the net tube material 20
Then, a flat shape retaining plate 22 is inserted thereinto, whereby the shape is retained in a flat band-like tube shape.

That is, the net tube material 20 is formed into a flat shape having folds on both sides in a state where the wound roll 20b is formed, and exhibits a flexible tube sheet shape which is easily deformed. It is extrapolated and held in a flat configuration with a predetermined width. At this time, the net tube material 20
It is preferable to loosely extrapolate the shape retaining plate 22 so as not to cause tension.

The shape-retaining plate 22 is provided with cutting means 23 which is located substantially at the center in the width direction and protrudes from both front and rear surfaces. Therefore, the net tube material 2 is fixed with the shape retaining plate 22 fixed.
When the net tube material 20 is transferred in the longitudinal direction of the band, the net tube material 20 is cut into two pairs at the center in the band width direction while forming cuts 26 on both front and back surfaces, and divided into a pair of net sheet materials 20a, 20a. Is done. Although not shown, the shape retaining plate 22 is attached to the bracket through a cut 26.

In the illustrated example, the cutting means 23 constitutes a circular blade 25 rotatably supported on a support shaft 24, and cuts the mesh with little tension on the net tube material 20. At this time, if the fusing blade is formed by heating the circular blade 25, the mesh can be blown, so that the cutting becomes easy.

(Process of Controlling Net Sheet Material) As shown in FIG. 5, the transferred net sheet material 20a, 20a
Is a guide plate 28 between the front and back net portions 2 and 3.
Are inserted, and both net sheet materials 20a, 20a are transported in the longitudinal direction of the band while the guide plate 28 is fixed, so that both net sheet materials 20a, 20a, 20a are separated from each other in the band width direction. For this reason, both side edges of the guide plate 28 are provided with guide edges 28a, 28a that gradually widen in the transport direction of the net sheet materials 20a, 20a.

Along with the step of controlling the net sheet material,
Alternatively, prior to that, when the net sheet material 20a, 20a divided into two by the cutting means 23 is transported with the front and back net sheet portions 2, 3 each of which is bent substantially in half, a pair of net sheet materials is used. Along the cut edges of the front net sheet portion 2 of the front net sheets 20a, the continuous belt-shaped receiving films 11, 11 are superimposed and transported in synchronization with the net sheet materials 20a, 20a. A continuous belt-shaped back header sheet 10 is straddled between the back net sheet portions 3, 3 of the pair of separated net sheet materials 20a, 20a to overlap each other, and is synchronized with both net sheet materials 20a, 20a. And transported.

(Longitudinal Welding Step) As shown in FIG.
On the guide plate 28, a pair of receiving films 11, 1
1 is welded 11a to the front net sheet portions 2, 2 of the pair of net sheet materials 20a, 20a, and the back header sheet 10 is attached to the pair of net sheet materials 20a, 20a.
The welding 10a is applied to the back net sheet portions 3 and 3a.

A pair of net sheet materials 20a, 20a
, The pair of receiving films 11, 11 and the back header sheet 10 are intermittently transferred by a drive roller device, and as shown in FIG. Equal to the width of

In view of the above, upper welding means 31 comprising a heating plate or the like for welding the pair of receiving films 11, 11 to the front net sheet portions 2, 2 of the pair of net sheet materials 20a, 20a, and the back header sheet 10 are provided. A lower welding means 32 composed of a heating plate or the like for welding to the back net sheet portions 3, 3 of the pair of net sheet materials 20a, 20a is arranged vertically above and below the guide plate 28, and the cylinder is moved up and down. When the intermittent transfer is stopped, the welding 11a and 10a are performed by pressing the welding means 31 and 32 in opposition to each other.

After the welding 11a, 10a is completed, the transfer width W
(Or an integral multiple of W) of the net sheet material 20a, 20
The upper cooling body 33 facing the weldings 11a and 11a and the lower cooling body 34 facing the weldings 10a and 10a are arranged vertically above and below the guide plate 28 at the position where the a is intermittently transferred. When the intermittent transfer is stopped, the two cooling bodies 33 and 34 are pressed against each other to cool the welded portions 11a and 10a, and to be formed at the time of welding. Straighten wrinkles.

(Strip Forming Step) Thereafter, as shown in FIG. 7, the strip-shaped front header sheet 9 is applied to the net sheet materials 20a, 20a from above the receiving films 11, 11.
And a pair of separated net sheet materials 20a, 20a
The front header sheet 9 is attached so as to straddle the front net sheet portions 2 and 2 of a, and is adhesively fixed to the receiving films 11 and 11 via the adhesive layer 12. In the case of the illustrated example, the front header sheet 9 is composed of one continuous strip-shaped sheet provided with a pair of pressure-sensitive adhesive layers 12 in advance.
It may be constituted by two continuous strip-shaped sheets respectively corresponding to 0a and 20a. Thus, the band-shaped bag structure 29 is formed.
Is obtained.

(Bag semi-finished product forming step)
When 9 is removed from the guide plate 28, the bag structure 29 is welded in the band width direction at predetermined intervals in the band longitudinal direction, and the front and back net sheet portions 2, 3 of the pair of net sheet materials 20a, 20a are welded to each other. The semi-finished bag 35 is formed by forming the side seal portion 6 and the welding portion 13 in which the front and back header sheets 9 and 10 are welded to each other.
Get.

For this reason, a pair of sealing means 36 and 37 composed of a heating plate or the like having a length traversing the bag structure 29 are arranged vertically and connected to lifting means such as a cylinder for intermittent transfer. At the time of stoppage, the side seal portion 6 and the welded portion 13 are formed by pressing both the sealing means 36 and 37 so as to face each other with the bag structure 29 interposed therebetween. Therefore, in the case of the illustrated example, the side seal portion 6 and the welding portion 13 are formed by a pair of net sheet materials 20a, 20a constituting the bag forming body 29.
Are formed simultaneously. The receiving film 11 located on the line of the side seal portion 6 is integrally welded to the front and back net sheet portions 2 and 3 and the back header sheet 10 as described above.
Since the welding prevention means is provided between the areas 1, they are not welded to each other.

At the position where the semi-finished bag 35 having the side seal portion 6 and the welded portion 13 formed is intermittently transferred by the transfer width W (or an integral multiple of W), the cooling bodies 38 and 39 facing the side seal portion 6 are located. Are vertically arranged with the bag semi-finished product 35 interposed therebetween, and are connected to elevating means such as a cylinder. When the intermittent transfer is stopped, the cooling bodies 38 and 39 are opposed to each other and pressed against the bag semi-finished product 35. By doing so, the side seal portion 6 and the welded portion 13 are cooled, and wrinkles generated at the time of welding are stretched and shaped.

(Separation Step) The semi-finished bag product 35 formed as described above is continuously transported intermittently to divide the front and back header sheets 9 and 10 almost at the center in the band width direction as shown in FIG. , The bag semi-finished product 35 to the side seal portion 6
And, by being cut along the welding portion 13, the net bags 1, 1 for two sheets are sequentially obtained.

For the above-mentioned dividing step, a dividing means 40 composed of a fusing blade or a cutting blade or the like is fixed to the transfer path of the semi-finished bag 35. It is bisected facing almost the center in the width direction. On the other hand, in the dividing step, the hot blade means (not shown) arranged facing the line of the side seal portion 6 and the welding portion 13 at a position where the semi-finished bag 35 is intermittently transferred by the transfer width W (or an integer multiple of W). At this time, the semi-finished bag 35 is cut along the entire width of the semi-finished product 35 along the line of the side seal portion 6 and the welded portion 13, whereby the net bags 1, 1 for two sheets are obtained at the same time. In addition, you may perform cutting | disconnection by a cutting blade instead of fusing. In the illustrated example, the dividing step is formed after the dividing step, but the dividing step may be reversed.

(Second Embodiment of Net Bag) FIG. 9 shows a second embodiment of the net bag. The net bag 1 has an article between front and back net sheet portions 2 and 3 arranged on both sides. A storage chamber 4 is formed, and side seal portions 6, 6 are provided at both side edges of the net bag 1 to weld the two net sheet portions 2, 3 to each other. The front and back net sheet portions 2 and 3 are formed by folding a single net sheet body along the bag bottom 7, and align the opposing edges of the front and back net sheet portions 2 and 3 with each other in a straight line. Opening edges 2a, 3
a, thereby forming an opening 8 of the article storage chamber 4, which is the same as in the first embodiment.

Along the opening edges 2a, 3a, front and back header sheets 9, 10 made of strip-shaped synthetic resin sheets are attached to the front and back net sheet portions 2, 3, respectively.
The front header sheet 9 is welded to the front net sheet portion 2 by seal lines 9a, 9a extending toward the entire width of the bag 1, and the back header sheet 10 is attached to the back net sheet portion 3 by the full width of the bag 1. Sealing lines 10a, 10 extending toward
a.

The structure of the front and back net sheet portions 2 and 3 is shown in FIG.
This is the same as the first embodiment shown in FIG. 1, and forms a sheet with a stretchable mesh in which a large number of monofilament filaments 15 having a substantially circular or elliptical cross section are crossed and integrated. 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 filament 15 at a portion facing the article storage room 4.
The seal lines 9a, 10a and the side seal portions 6, 6
Is located at the position of the ribbon portion 1 where the filament 15 is flattened.
7, which enables strong and flat welding at a desired welding position. This point is the same as in the first embodiment described above, and the above description is referred to.

When forming the side seal portions 6, 6, the front and back header sheets 9, 10 are welded on the line along the side seal portions 6 with the front and back net sheet portions 2, 3 interposed therebetween. The four layers of the ribbon sections 17, 17 formed by the sheet sections 2, 3 and the front and back header sheets 9, 10 sandwiching the ribbon sections 17, 17 are integrally welded. In the area above the front and back net sheet portions 2 and 3, the front and back header sheets 9 and 10 are located on the line of the side seal portion 6 and form a welded portion 13 mutually.

The front and back header sheets 9 and 10 constitute a seal margin 14 which can be welded to each other by an extension extending beyond the opening edges 2a and 3a of the front and back net sheet sections 2 and 3. The welded portion 13 is formed on both sides, and an article insertion opening 14a is formed between the welded portions 13 and 13 so that the space between the front and back header sheets 9 and 10 is opened. Then, at least one of the front and back header sheets 9 and 10, both in the illustrated example, are provided with the seal margin 14 and the opening edge 2.
a, the openable portion 18 formed by a tearable perforation 51 extending in the longitudinal direction of the header sheet (in the width direction of the bag body).

According to the net bag according to the second embodiment, as shown in FIG.
Since the article insertion port 14a is provided between 10, the articles can be easily inserted into the storage chamber 4 from the article insertion port 14a. For example, an article can be automatically inserted by an automatic insertion machine, or an article can be easily inserted by a manual operation of an operator.

Then, after the article is inserted, FIG.
As shown in FIG. 7, the seal margins 14, 14 of the front and back header sheets 9, 10 are welded 19 to each other. When welding is performed by an automatic sealing machine or the like, welding 19 is performed over the entire width of the bag body 1. Therefore, in this state, it is shipped as a bagged product. It should be noted that the front and back header sheets 9 and 10 can be printed with a product display such as a trademark or a place of origin display.

When the user who purchased the over-the-counter packaged bag product takes it home and unseals it, he pulls the welded portion 19 of the front and back header sheets 9 and 10 with his fingertips to open the free portion 18 formed by the perforations 51. 10B, the front and back header sheets 9 and 10 are opened, and the opening 8 of the bag body 1 is opened as shown in FIG. Instead of perforations 51, a tear tape that allows the header sheet to be torn may be provided. In this case, the front and back header sheets 9, 1
It suffices to provide it in only one of 0.

(Method of Manufacturing Net Bag According to Second Embodiment) Net bag 1 according to the second embodiment as shown in FIG.
Is automatically made on the line by a bag making machine. Although each step is illustrated separately due to space limitations, it should be appreciated that the steps are continuous on a line.

(Step of Forming Net Sheet Material) A pair of net sheet materials 20a, 20a are formed from a synthetic resin net tube material 20, which is the same as in the case of the first embodiment described with reference to FIG. Therefore, the above description is cited.

(Process of Controlling Net Sheet Material) The transferred net sheet materials 20a, 20a have both side edges of the guide plate 28 inserted between the front and back net portions 2, 3, respectively. By transporting both net sheet materials 20a, 20a in the band longitudinal direction in a fixed state, both net sheet materials 20a, 20a are separated from each other in the band width direction S along both side edges of the guide plate 28. This point is the same as that of the first embodiment described with reference to FIG. 5, and the above description is referred to. However, the receiving film 11 described in the first embodiment
Is not used here.

(Strip Forming Step) Along with or prior to the step of controlling the net sheet material, the net sheet materials 20a, 20a that have been divided into two by cutting means are respectively folded into substantially half-folded front and back net sheets. Parts 2, 3
As shown in FIG. 11, the belt-shaped front header sheets 9 and 9 and the belt-shaped rear header sheet 1
0 and 10 are fed out. These header sheets 9,
10 is formed in advance with a freely openable portion 18 composed of perforations 51 and the like continuous in the longitudinal direction. That is, in the pair of front header sheets 9, 9, the cut edges of the front net sheet portion 2 in the net sheet materials 20 a, 20 a are located at the intermediate portions in the band width direction, and the perforation 51 is formed by the front net sheet. It is superposed on the front net sheet portion 2 so as to be located outside the cut edge of the portion 2. In the pair of back header sheets 10, 10, the cut edges of the back net sheet portion 3 of the net sheet materials 20a, 20a are located at the middle portions in the band width direction, and the perforations 51 are formed by the back net sheet. The back net sheet portion 3 is superimposed so as to be located outside the cut edge of the portion 3.

Therefore, as shown in FIG. 12, the front header sheets 9, 9 are welded 9a to the front net sheet portions 2, 2 of the pair of net sheet materials 20a, 20a on the guide plate 28, and The header sheet 10 is welded 10a to the back net sheet portions 3, 3 of the pair of net sheet materials 20a, 20a. A pair of net sheet materials 20a, 20a and front and back header sheets 9,
9, 10, and 10 are intermittently transferred by the drive roller device, and as shown in FIG. 12, the transfer width W is equal to the width of the net bag 1 finally formed.

Therefore, the upper header means 9 comprising a heating plate or the like for welding the front header sheets 9, 9 to the front net sheet portions 2, 2 of the pair of net sheet materials 20a, 20a, and the back header sheet 10 are paired. Net sheet portions 3, 3 in the net sheet materials 20a, 20a
Welding means 32 comprising a heating plate or the like for welding to
Are vertically arranged with the guide plate 28 interposed therebetween, and are connected to lifting means such as a cylinder. When the intermittent transfer is stopped, the welding means 31 and 32 are pressed against each other so that the welding 9a is formed. Perform 10a.

After welding 9a and 10a are completed, the transfer width W
(Or an integral multiple of W) of the net sheet material 20a, 20
The upper cooling body 33 facing the welding 9a and the lower cooling body 34 facing the welding 10a are vertically arranged with the guide plate 28 interposed therebetween at the position where the a is intermittently transferred, and a cylinder or the like. When the intermittent transfer is stopped, the cooling members 33 and 34 are pressed against each other when the intermittent transfer is stopped, thereby cooling the welded portions 9a and 10a and extending wrinkles generated during welding. Shape it. Thereby, the band-shaped bag structure 29 is obtained.

(Bag semi-finished product forming step)
As shown in FIG. 13, the pair of bag members 29 are welded in the band width direction at predetermined intervals in the band longitudinal direction, and the pair of net sheet materials 20 a , 20a by forming a side seal portion 6 in which the front and back net sheet portions 2 and 3 are welded to each other, and forming a welded portion 13 in which the front and back header sheets 9 and 10 are welded to each other. obtain.

For this reason, a pair of sealing means 36 and 37 composed of a heating plate or the like having a length traversing the bag structure 29 are arranged vertically and connected to a lifting means such as a cylinder, so that intermittent transfer is performed. At the time of stoppage, the side seal portion 6 and the welded portion 13 are formed by pressing both the sealing means 36 and 37 so as to face each other with the bag structure 29 interposed therebetween. Therefore, in the case of the illustrated example, the side seal portion 6 and the welded portion 13 are formed by a pair of net sheet materials 20 a
Are formed simultaneously.

At the position where the semi-finished product 35 formed with the side seal portion 6 and the welded portion 13 is intermittently transferred by the transfer width W (or an integral multiple of W), the cooling bodies 38 and 39 facing the side seal portion 6 are provided. Are vertically arranged with the bag semi-finished product 35 interposed therebetween, and are connected to elevating means such as a cylinder. When the intermittent transfer is stopped, the cooling bodies 38 and 39 are opposed to each other and pressed against the bag semi-finished product 35. By doing so, the side seal portion 6 and the welded portion 13 are cooled, and wrinkles generated at the time of welding are stretched and shaped.

(Separation Step) The bag semi-finished product 35 formed as described above is continuously transferred to the transfer width W (or an integral multiple of W).
At the position where only the intermittent transfer is performed, the side seal portion 6 and the welded portion 1
The cutting is performed by hot blade means (not shown) arranged facing the line 3. That is, the side seal portion 6 and the welding portion 13
By fusing the semi-finished product 35 over the entire width along the line, the two net bags 1, 1 are obtained at the same time. In addition, you may perform cutting | disconnection by a cutting blade instead of fusing.

(Modification of Manufacturing Method) The above manufacturing method is as follows.
Each of the front and back header sheets 9, 9, 10, and 10 is shown by a pair of band-shaped sheets. However, the front and rear header sheets 9 are formed by one band-shaped sheet, and the back header sheet 10 is formed by one band-shaped sheet. May be welded so as to straddle the edges of the front net sheet portions 2 and 2 and the edges of the back net sheet portions 3 and 3 in the pair of net sheet materials 20a and 20a. In that case, FIG.
As shown in the figure, the semi-finished bag 35 is made up of a pair of net sheet materials 20a, 20a by the front and back header sheets 9, 10.
In this case, as shown in the figure, the front and back header sheets 9 and 10 are divided substantially at the center in the band width direction, and the semi-finished bag 35 is connected to the side seal portion 6 and the welding portion as shown in FIG. By cutting along the line 13, two net bags 1, 1 are sequentially obtained. For this reason, on the transfer route of the semi-finished bag product 35, a dividing means 40 composed of a fusing blade or a cutting blade or the like that divides the front and back header sheets 9 and 10 near the center in the band width direction and is fixed is fixed. Bag 1
In order to obtain the above, a hot blade means (not shown) is arranged facing the line of the side seal portion 6 and the welding portion 13 at a position where the semi-finished bag 35 is intermittently transferred by the transfer width W (or an integral multiple of W). By fusing the semi-finished bag 35 over the entire width along the line of the side seal portion 6 and the welded portion 13, the net bags 1, 1 for two sheets are simultaneously obtained.

[0065]

According to the net bag of the present invention, the article insertion opening 1 formed between the pair of front and back header sheets 9 and 10 is provided.
After inserting fresh fruits and vegetables such as green soybeans and okra into the article storage room 4 of the net bag 1 from 4a, the front and back header sheets 9, 1
Since the zero seal margin 14 can be easily welded and sealed by an automatic sealing machine or the like, article packaging is simple and easy, and is also suitable for automatic packaging. Then, for the user who has purchased the bagged articles, the front and back header sheets 9, 10
At least one of them is provided with an openable portion 18 which can be freely opened, so that the article can be easily taken out and is extremely practical.

According to the method for manufacturing a net bag of the present invention, when the net bag 1 is formed based on the net sheet material 20a made of synthetic resin, the net tube material 20 is formed.
And a pair of half-folded net sheet materials 20a, 20a are formed from each other, and the bag constituting body 29 is continuously formed based on the respective net sheet materials 20a, 20a.
Since the net semi-finished product 35 is formed and the net semi-finished product 35 is successively obtained by dividing the semi-finished product 35, the line speed is high, which is suitable for mass production of net bags.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of a net bag according to the present invention, wherein (A) is a front view and (B) is a longitudinal side view.

FIG. 2 shows a use state of the net bag according to the first embodiment, in which (A) is a longitudinal side view in a state of being closed,
(B) is a longitudinal sectional side view of the opened state.

FIG. 3 is an enlarged partial perspective view showing a side seal portion of the net bag.

FIG. 4 shows a net sheet material forming step in the method for manufacturing a net bag according to the first embodiment, and FIG. 4 (A) is a perspective view showing a state in which a net sheet material is formed from a net tube material; (B) is an explanatory view of the same step.

FIG. 5 is a perspective view showing a net sheet material control step in the manufacturing method.

FIG. 6 is a perspective view showing a longitudinal welding step in the manufacturing method.

FIG. 7 is a perspective view showing a band-shaped body forming step and a bag semi-finished product forming step in the manufacturing method.

FIG. 8 is a perspective view showing a separation step in the manufacturing method.

FIG. 9 shows a second embodiment of the net bag of the present invention, wherein (A) is a front view and (B) is a longitudinal side view.

10A and 10B show a use state of the net bag according to the second embodiment, and FIG. 10A is a longitudinal side view in a state where the net bag is closed.
(B) is a longitudinal sectional side view of the opened state.

FIG. 11 is a perspective view showing a net sheet material forming step in the method for manufacturing a net bag according to the second embodiment.

FIG. 12 is a perspective view showing a band forming step in the manufacturing method.

FIG. 13 is a perspective view showing a bag semi-finished product forming step and a separating step in the same manufacturing method.

FIG. 14 is a perspective view showing a separation step in a modified example of the manufacturing method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Net bag 2 Front net sheet part 3 Back net sheet part 2a, 3a Opening edge 6 Side seal part 8 Opening 9, 10 Header sheet 11 Receiving film 12 Adhesive layer 13 Welding part 14 Sealing allowance 14a Article insertion opening 18 Free opening Part 19 Welding 51 Perforation 20 Net tube material 20a Net sheet material 29 Bag structure 35 Bag semi-finished product

[Procedure amendment]

[Submission date] November 22, 1999 (1999.11.
22)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

[0006]

Means for Solving the Problems The present invention provides a net bag capable of automatic packaging, and is configured as a first means. The net bag is made of synthetic resin sandwiching an article storage room .
Opening formed by the front and back net sheet portions 2 and 3
A net- shaped net bag, header sheets 9 and 10 made of a band-shaped synthetic resin sheet are attached to each of the front and back net sheet portions 2 and 3 along the opening edge of the bag body.
The front and back net sheet portions 2 and 3 are made of a large number of materials by being welded by seal wires 9a and 10a extending in the opposite directions.
Expandable and self-contained filament filaments intersected
And the sealing lines 9a, 10a
To form a ribbon portion with a flattened filament,
Of the front and back headers at the seal lines 9a and 10a.
Become welded to each of the over preparative 9,10, front and back header sheet 9 and 10, sealing area 14 which allows welding the two header sheet to each other by the extension extending beyond the opening edge 2a of the bag body, the 3a, 14 and at least one header sheet is provided with an openable portion 18 that can communicate with the opening 8 of the bag.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

[0008] Further, the net bag of the present invention is configured as a second means .
Upper opening formed by front and back net sheet parts 2 and 3
A receiving film 11 made of a synthetic resin film on the front net sheet portion 2 along the opening edge 2a of the bag body.
While welding the sealing line 11a, receiving only the film 11 Table header sheet 9 made of a synthetic resin sheet through an adhesive layer 12 releasably adhered to; backing net sheet 3 along the opening edge 3b of the bag body A back header sheet 10 made of a synthetic resin sheet is welded with a seal wire 10a , and the front and back net sheets 2 and 3 are made of a large number of monofilaments.
A stretchable mesh that intersects the filaments
Eye and at the same time as the sealing lines 11a and 10a.
To form a flattened ribbon portion, the ribbon portion
At the seal lines 11a and 10a, respectively.
A seal margin 14, which is formed by welding the front and back header sheets 9, 10 to each other by an extension extending beyond the opening edges 2a, 3a of the bag body. 14 and an openable portion 18 that can communicate with the opening of the bag body between the front header sheet 9 and the receiving film 11 via the peelable adhesive layer 12.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

[0009] Further, the net bag of the present invention is configured as a third means .
Upper opening formed by front and back net sheet parts 2 and 3
And a header sheet 9 or 10 made of a strip-shaped synthetic resin sheet is attached to each of the front and back net sheet portions 2 and 3 along the opening edge of the bag body, and the width direction of the bag.
The front and back net sheet portions 2 and 3 are formed by welding with a plurality of monofilaments.
Stretchable with crossing filaments
And a seal mesh 9a, 10a
Forming a flattened ribbon portion, and
Parts are sealed by the sealing lines 9a and 10a.
Sealing margins 14, 14 formed by welding the front and back header sheets 9 , 10 to each of the front and back header sheets 9, 10 by means of extensions extending beyond the opening edges 2a, 3a of the bag body. And at least one of the header sheets is provided with an openable portion 18 comprising a tearable perforation 51 below the seal margin 14 .

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

[0010] The first to third means is constituted by
Front and back net sheet parts
2 and 3 are welded side seams located on both sides of the bag
Formed at the side seal portion.
Monofilament wires forming the cut sheet portions 2 and 3
Form a ribbon with flattened strips, front and back net sheet
It is preferable that two or three ribbons are welded together.
No.

 ──────────────────────────────────────────────────続 き Continued on front page F term (reference) 3E035 AA11 BA09 BB02 BB08 BC02 BD01 CA07 3E064 AA01 BA10 BA22 BC18 EA18 FA01 HF02 HG05 HM01 HN02 3E067 AA11 AB08 AB09 AC03 BA12A BB07A BB14A BC10A CA01 FC01 GB03

Claims (7)

[Claims] 1. A side seal portion is formed by welding a front and back net sheet portion made of synthetic resin disposed on both sides of a bag body with a product storage room interposed therebetween, and a side seal portion is formed. A net bag provided with an opening portion, wherein a header sheet made of a band-shaped synthetic resin sheet is added to each of the front and back net sheet portions along the opening edge of the bag body, wherein the header sheet is formed of a bag. An extension extending beyond the opening edge constitutes a seal allowance for welding the two header sheets to each other, and at least one of the header sheets is provided with an openable portion which can communicate with the opening of the bag body. Characteristic net bag. 2. The method according to claim 1, wherein the seal margins of the pair of header sheets are welded to each other while the articles are stored in the article storage chamber, and at least one of the header sheets is formed to be freely openable. 2. The net bag according to 1. 3. A side seal portion is formed by welding the front and back net sheet portions made of synthetic resin disposed on both sides of the bag body with the article storage chamber interposed therebetween, forming a side seal portion. A net bag provided with an opening at the front, and a header sheet made of a band-shaped synthetic resin sheet attached to each of the front and back net sheet portions along the opening edge of the bag body. Along with the net sheet portion, a receiving film made of a synthetic resin band-shaped film is welded, and a front header sheet is arranged on the receiving film, and the front header sheet and the receiving film are mutually interposed via an adhesive layer. It is made by attaching and detaching the back header sheet along the back net sheet along the opening edge of the bag body. The front and back header sheets extend beyond the opening edge of the bag body. The extension allows the two header sheets to be welded to each other to form a seal allowance, and allows the opening to communicate with the opening of the bag between the front header sheet and the receiving film via a peelable adhesive layer. A net bag characterized by comprising a part. 4. A side seal portion is formed by welding the front and back net sheet portions made of synthetic resin disposed on both sides of the bag body with the article storage chamber interposed therebetween, thereby forming a side seal portion. A net bag provided with an opening portion, wherein a header sheet made of a band-shaped synthetic resin sheet is welded to each of the front and back net sheet portions along the opening edge of the bag body, wherein the header sheet has an opening in the bag body. An extension extending beyond the edge constitutes a seal allowance for welding both header sheets to each other, and at least one of the header sheets is provided with an openable portion constituted by a tearable perforation. And a net bag. 5. The net bag according to claim 4, wherein a pair of header sheets are provided with perforations located below the seal margin so that the pair of header sheets can be torn in the longitudinal direction of the band. 6. In the process of transferring a synthetic resin net tube material, a shape retaining plate is inserted into the net tube material so that the net tube material is retained in a flat band-like tube shape. The net tube material is divided at the substantially center in the band width direction through the cutting means while transferring the net tube material in the longitudinal direction of the band with the fixed, and the front and back net portions are bent substantially in half. A net sheet material forming step of obtaining a pair of opposed net sheet materials, inserting both side edges of the guide plate between the front and back net sheet portions of the pair of net sheet materials, and fixing the guide plate to both sides. By transferring the net sheet material in the longitudinal direction of the band, both net sheet materials are separated from each other in the band width direction along both side edges of the guide plate. A sheet-like material control step, a band-shaped receiving film is attached along the cut edge of the front net sheet portion and welded in the longitudinal direction of the band, and the belt-shaped back header sheet is attached to the intermediate portion in the band width direction at the back net. A longitudinal welding step of attaching along the back net sheet portion so that the cut edge of the sheet portion is located and welding in the band longitudinal direction; and Along with the front net sheet portion so that the cut edge portion of the front net sheet portion is located at the middle portion in the band width direction, the front header sheet is attached to the receiving film via an adhesive layer with respect to the receiving film. A band-shaped body forming step of obtaining a band-shaped bag structure by fixing, and by welding the bag structure at predetermined intervals in the band longitudinal direction and in the band width direction, a pair of net sheet materials are formed. Forming a side seal portion in which the front and back net sheet portions are welded to each other, and on the line of the side seal portion, the receiving film and the front header sheet are not welded to each other. A bag semi-finished product forming step of obtaining a bag semi-finished product from the bag construct by sandwiching and welding the net sheet portion, and separating the bag semi-finished product from the bag construct by dividing on the line of the side seal portion and dividing the bag semi-finished product The method for manufacturing a net bag according to claim 3, comprising a separating step. 7. In the process of transferring a synthetic resin net tube material, a shape retaining plate is inserted into the net tube material to thereby maintain the shape of the net tube material in a flat band-like tube shape. The net tube material is divided at the substantially center in the band width direction through the cutting means while transferring the net tube material in the longitudinal direction of the band with the fixed, and the front and back net portions are bent substantially in half. A net sheet material forming step of obtaining a pair of opposed net sheet materials, inserting both side edges of the guide plate between the front and back net sheet portions of the pair of net sheet materials, and fixing the guide plate to both sides. By transferring the net sheet material in the longitudinal direction of the band, both net sheet materials are separated from each other in the band width direction along both side edges of the guide plate. A sheet net material controlling step, wherein the cut edge of the front net sheet portion is located at the middle portion of the band-shaped front header sheet in the band width direction and the perforation formed in the band longitudinal direction of the front header sheet is the front net sheet portion. Is attached along the front net sheet portion so as to be located outside the cut edge portion of the sheet, and is welded in the longitudinal direction of the band. Is provided along the back net sheet portion so that the cut edge of the back net sheet portion is located outside the cut edge portion of the back net sheet portion. A belt-shaped body forming step of obtaining a band-shaped bag construct by welding in the band longitudinal direction, and welding the bag construct in the band width direction at predetermined intervals in the band longitudinal direction, thereby forming a pair of net sheets. Forming a side seal portion in which the front and back net sheet portions of the material are welded to each other, and welding the front and back header sheets to each other with the front and back net sheet portions sandwiched on the line of the side seal portion; The semi-finished bag forming step of obtaining a semi-finished product, and a separating step of separating the semi-finished bag product from the bag structure by dividing the semi-finished bag by being positioned on the line of the side seal portion, wherein A method for producing the net bag described in the above.