JPH101145A - Paper bag with filling port - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper bag with a filling port, that allows carrier air to escape well and prevents content such as a powder or fine granular material from blowing out when the content is filled in the paper bag even though the paper bag has such a construction that a sheet of patch paper is stuck on a port closure part of the bag main body with an adhesive without sewed on, whether it is a bottom-pasted bag or folded-pasted bag. SOLUTION: A cylindrical bag main body comprises one or more layers, can be flattened along side folds 11 and has a port closure part that is closed by a filling valve provided on a port. A sheet of patch paper 20 is laid and stuck on the port closure part with adhesives 21 applied in beltlike or dotted pattern. Two or more pin-holes 17 leading from the inside of the bag main body to the atmosphere are formed in non-stuck parts where the patch paper 20 is not stuck on the port closure part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper bag with a spout, and more particularly to a paper bag with a spout suitable for containing a powder or fine particles such as cement.

[0002]

2. Description of the Related Art In Japan, such a paper bag with a blow-out opening, that is, a paper bag with a blow-out opening which facilitates filling of a powdery substance such as cement from the mouth, has been conventionally shown in FIG. A double stitched bag with a valve port of JIS Z 1505 cement kraft paper bag was generally used.

[0003] The reason why the sewing bag is used as the paper bag with the blowing port is that the sewing bag is applied over the mouth end of the tubular bag body, and the backing paper is applied to one side of the bag. Since the opening of the bag body was fixed and closed by sewing with a sewing machine in the width direction from the part, when the powder was transported by air and blown into the paper bag from the blowing port, the sewing machine hole worked well for air release. This is because the filling can be made very smooth because the transport air can be released.

However, in Europe and the United States, paper bags with blowing ports are
Instead of the sewing bag as described above, a paper bag called a so-called “bottom-attached bag” is used. The bottom-attached bag has an end-closing type, for example, the Japanese Utility Model Publication No. 52-5105.
No. 5 is referred to.

[0005] That is, the bottom-attached bag is opened at both sides of the mouth portion of the cylindrical bag body which is flat at least at both side folding lines so as to form two inclined folding lines connected to the respective side folding lines. While folding at the center side of the bag body to form both side folding parts, the front tongue piece and the rear tongue piece formed between the folding parts on both sides are bent inside the opening part, and the tip parts overlap each other and partially Is folded over the fold, and at that time, a hexagonal mouth is formed at the top of one of the folds with a piece of paper for a filling valve extending over the front and rear tongues, and a patch is adhered on this. It is composed.

[0006] In such a bottom-attached bag, since there is no sewing machine hole unlike a sewing machine sewing bag, when the powder is pneumatically conveyed and blown into the paper bag from a blowing port, the paper bag expands and the content of the contents is increased. Since filling cannot be performed, the wall surface 2 near the mouth end of the bottom-attached bag 1 as shown in FIG.
A large number of air holes 3 were formed.

[0007] Thus, even with this bottom-attached bag, when the powder is pneumatically transported and blown into the paper bag from the blowing port, the air holes function as air vents to allow the transport air to escape, so that the filling is very difficult. Can be smooth.

[0008]

However, in the bottom-attached bag in which a large number of ventilation holes are formed in the wall near the mouth end as described above, the powder is pneumatically transported and blown into the paper bag from the blowing port. Sometimes, not only transport air escapes,
Since the powder, which is the content, also jumps out, the surroundings are not only stained, but also the environment for filling the content is deteriorated.

[0009] There is another bag disclosed in Japanese Patent Publication No. 1-50662 which is generally called a foldable bag. The mouth end of a cylindrical bag body is bent to one wall surface and the bent portion is formed. Apply a patch so as to straddle it. At that time, the edge of this patch located on the side of the bag body bent to the length of the wall extends to the wall surface of the bag body, and both edges of this patch are bonded to the wall surface of the bag body. An adhesive agent is used to substantially surround and fix the bent end portion of the bag body at the mouth end.

However, since the paper bag having such a structure does not have a sewing machine hole as described above, it is not suitable for a paper bag in which powder is blown and filled (that is, transportation air hardly escapes and the contents are not filled). Cannot be smoothed).

SUMMARY OF THE INVENTION An object of the present invention is to solve such a conventional problem. Regardless of a bottom-attached bag or a folding-attached bag, a backing paper is attached to a bag body with an adhesive without sewing. It is an object of the present invention to provide a paper bag with a blow-out port which can easily escape transport air at the time of filling contents such as powders and fine granular materials even in a paper bag attached to a mouth closing portion and does not cause the contents to be blown out. .

[0012]

According to the present invention, a blow-off valve is provided at the mouth of a cylindrical bag body which is made of one or more layers of paper and which is flattened at both side folding lines. In a paper bag for filling powder or fine particulate matter, which is provided with a closed mouth closing portion, and a sheet of paper is overlapped and adhered to the mouth closing portion, the inside of the bag body and the atmosphere are provided at the mouth closing portion. A plurality of pin-holes communicating with each other, the backing sheet is bonded to the mouth closing portion by a band-like or point-like bonding portion, and the pinhole is formed in a non-bonding portion with the backing paper. Features.

[0013] In the paper bag with the blowing port having such features, a plurality of pinholes are also formed in the non-adhesive portion of the backing sheet with the mouth closing portion, and the pinch formed in the mouth closing portion is formed. The position of the pinhole and the position of the pinhole formed in the backing sheet may be shifted without overlapping.

[0014] The mouth closing portion may open and close both sides of the mouth of the bag body toward the center of the bag body while forming two inclined fold lines connected to the side fold lines. Forming both side folding parts, bending the front tongue piece and the rear tongue piece formed between the folding parts on both sides into the inside of the opening part and overlapping their tips with each other to form a hexagonal shape as a whole The backing paper may be superimposed on and bonded to the folded portion on both sides thereof.

Further, the mouth closing portion is formed by folding one corner of the mouth portion of the bag body into the inside of the bag to form a blowing port, and bending the mouth end of the bag body toward one wall surface side, A contact paper may be bonded so as to straddle the mouth closing portion.

According to such a paper bag with a blowing port, when a powder is filled by pneumatic transportation by inserting a nozzle into the paper bag from the blowing port, the paper bag expands due to the transport air. However, since the transport air escapes to the atmosphere at any time via a pinhole formed in the mouth closing portion, the powder can be continuously filled.

At this time, a backing paper is adhered to the mouth closing portion where the pinhole is formed by a band-like or dot-like adhesive portion,
Because the pinhole is formed in the non-adhesive portion of the backing sheet, the air transported out of the pinhole passes through the non-bonded gap between the backing sheet and the mouth closure, and the overlapping surface of the backing sheet , The powder, which is the content, does not come out to the atmosphere together with the transport air, so that the surroundings are not polluted, and the environment for the content filling operation can be kept good.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a paper bag with a blowout opening according to the present invention.
FIG. 1 shows a paper bag 10 with a blowing port according to one embodiment of the present invention. The paper bag 10 with the blowing port of this embodiment is basically a bottom-attached bag.

That is, the paper bag 10 with the blowing port is
It has the following configuration. First, as shown in FIG. 2, one side or both sides of a mouth portion of a cylindrical bag body 12 which is made of one or more layers of paper and is flattened at both side folding lines 11 is formed by each side folding line. 2 inclined inclined lines 1 connected to 11
While being opened so as to form No. 3, the bag is folded toward the center of the bag body to form both-side folded portions.

Next, a plurality of pinholes 17 are formed in a row in the front tongue piece 15 and the rear tongue piece 16 formed between the both side bent portions 14 to form ventilation holes. After that, a paper piece 18 for the filling valve is provided on the upper part of one of the folded portions 14 so as to extend over the front and rear tongue pieces 15 and 16. Then, the front tongue piece 15 and the rear tongue piece 16 are bent to the inside of the unfolding part, and the tip parts 15a, 16
a are overlapped with each other and a part thereof is folded on the folding portion 14, thereby forming a hexagonal mouth closing portion 19 as a whole as shown in FIG.

Next, as shown in FIG. 4, a contact paper 20 is superimposed on the mouth closing portion 19. The backing paper 20 has a band-like bonding portion 2 as shown by a shadow line in FIG.
1. At this time, the band-shaped bonding portion 21 is used.
Is selected so as to be a position without the pinhole 17. Thereby, a blow-out port provided with a blow-out port 23 in which a blow-out port 22 is formed by a paper piece 18 for a filling valve in a gap between the front and rear tongue pieces 15 and 16 at one end side of the folded-up part and the folded-in part 14. The attached paper bag 10 is formed.

In this manner, the mouth side of the paper bag 10 with the blowing port in the bottom-attached bag is formed. In general, the bottom 24 has the same structure as the mouth 23. Therefore, in the case of the paper bag 10 with the blowing port of this embodiment, the bottom 24
Is also configured with the same bottom bonding as described above. However, since the bottom portion 24 is not provided with the blowing port, the above-described paper piece for the filling valve is not attached.

In the case of filling the content of the powder into the paper bag 10 having the above-described structure, the tip end portion 2 of the powder transport pipe 25 by compressed air is used as shown in FIG.
5a is a blowing port 2 formed of a sheet 18 for a filling valve.
2 and supply powder with compressed air (not shown)
And blows it into the paper bag 10 with a blowing port.

When the powder is blown into the paper bag 10 with the blowing port by pneumatic transportation in this manner, the paper bag 10 starts to expand by the transport air. However, the mouth portion 2 of the paper bag
As is clear from the cross-sectional view of FIG. 6 in which FIG. 3 is cut longitudinally, the transport air blown into the paper bag 10 with the blowing port is connected to the front tongue piece 15 constituting the mouth closing surface (part). Back tongue piece 1
6 comes out of the plurality of pinholes 17 opened.

As described above, the backing paper 20 is adhered to the mouth closing surface (part) by the band-like adhesive part 21.
Since the plurality of pinholes 17 are formed at positions separated from the bonding portion 21, that is, at the non-bonding portions, the pinholes 1
The transport air exiting from 7 passes through a non-adhesive gap between the mouth closure and the backing sheet 20 and is exhausted from both ends of the backing sheet 20 to the outside.

As described above, the powder is transferred to the paper bag 1 by pneumatic transportation.
The transport air to be filled into 0 includes a plurality of pinholes 17 and
Since the air escapes to the atmosphere at any time through the non-adhesive gap between the mouth closing portion and the backing sheet 20, the paper bag 10 does not expand excessively, so that the powder can be continuously filled. Further, as described above, since the contact paper 20 is disposed at the mouth closing portion and the pinhole 17 is not directly opened to the atmosphere, when the transport air exits from the pinhole 17, the force that the transport air blows out, that is, the jet output, is reduced. There is no danger of powder coming out because it is weakened.

FIG. 7 is a cross-sectional view of a mouth portion of a paper bag 30 with a blow-out port according to another embodiment of the present invention, which is cut off in the vertical direction similarly to FIG. In the paper bag 30 of this embodiment,
Backing paper 31 adhered to the mouth closing portion with a band-like adhesive portion 21
Also, a plurality of pinholes 32 are formed. However, the position of the pinhole 32 formed in the backing paper 31 is shifted so as not to coincide with the position of the pinhole 17 formed in the mouth closing portion.

As described above, the pinhole 32 is also provided in the backing paper 31.
And a pinhole 17 formed in the mouth closure
And the position of the pinhole 32 formed on the backing sheet 31 are not overlapped and shifted, so that the powder does not blow out together with the transport air for the same reason as described above. The transport air can be exhausted in a shorter time than the paper bag of the embodiment shown.

The paper bag 10 with the blowing port according to the above-described embodiment.
Was a bottom-attached bag, but the present invention can also be applied to a folded-back bag. FIG. 8 shows a paper bag 40 with a blowing port according to another embodiment of the present invention formed as this folding bag.
Is shown in The paper bag 40 with the blowing port is composed of a cylindrical bag body 42 having V-shaped folds 41a and 41b formed on both sides.

In the paper bag 40 with the blowing port, one corner of the opening of the bag body 42 is folded into the inside of the bag to form a blowing port 46. Then, as shown in FIG. The part is bent to one wall side to form a mouth closing part, and a backing sheet 45 is adhered so as to straddle the mouth closing part 44 and is completely closed, whereby the blowing port 46 leading to the inside of the bag is formed.
Are formed so as to form a partition.

Here, before placing the backing paper 45 on the mouth closing portion 44 and adhering it, the bent portion 47 bent to one wall side to close the mouth end of the bag body 42 is provided with a ventilation hole. Are formed in line with a line parallel to the edge of the mouth of the bag body 42. When one edge of the backing paper 45 is arranged to straddle the mouth closing portion 44, as shown in FIG. 9, the edge of the bent portion 47 (the edge of the bag body) The pinhole 48 is not directly open to the atmosphere, but is open to the gap between the bent portion 47 and the inner surface of the backing sheet 45 because the pinhole 48 is bonded to the wall surface of the paper bag below the edge) by the band-shaped bonding portion 49. doing. The other edge of the backing paper 45 is similarly bonded to the other wall surface by a band-shaped bonding portion 49.

Therefore, according to the paper bag 40 with the blowout port according to the embodiment of the present invention formed of such a folded and pasted bag, the nozzle is inserted into the paper bag 40 from the blowout port 46 as described above. When the powder is blown by pneumatic transportation, the paper bag 40 starts to expand with the transport air. However, as is clear from the cross-sectional view of FIG. 10 in which the mouth of the paper bag 40 with the blowing port is cut vertically, the transport air blown into the paper bag 40 with the blowing port closes the mouth closing part 44. It escapes from the plurality of pinholes 48 opened in the bent portion 47 that constitutes the same.

As described above, a backing sheet 45 is bonded to the mouth closing portion 44 by a band-shaped bonding portion 49, and a plurality of pinholes 48 are formed in a non-bonding portion between the bonding portions 49. Therefore, the transport air flowing out of the pinhole 48 is exhausted to the outside from both ends of the backing sheet 45 through a non-adhesive gap between the mouth closing portion 44 and the backing sheet 45.

As described above, the powder is pneumatically transported to the paper bag 4.
The transport air to be filled to zero includes a plurality of pinholes 48 and
Since the air escapes to the atmosphere at any time through the non-adhesive gap between the mouth closing portion 44 and the backing sheet 45, the paper bag 40 does not expand excessively, so that the powder can be continuously filled. In addition, as described above, the paper 45
Since the pinholes 48 are not directly open to the atmosphere, when the transport air exits the pinholes 48, the power of the transport air blown out, that is, the ejection power is weakened, so that there is no possibility that the powder will come out together.

FIG. 11 is a cross-sectional view of a mouth portion of a paper bag 50 with a blow-out port according to still another embodiment of the present invention, which is cut off in the vertical direction similarly to FIG. Paper bag 5 of this embodiment
In the case of No. 0, a plurality of pinholes 52 are also formed in the backing paper 51 adhered to the mouth closing portion by the band-like adhesive portion 49.
However, the position of the pinhole 52 formed in the backing paper 51 is shifted so as not to coincide with the position of the pinhole 48 formed in the bent portion 47 of the mouth closing portion 44.

As described above, the pinhole 52 is also provided in the backing paper 51.
Is formed, and the position of the pinhole 48 formed in the bent portion 47 of the mouth closing portion 44 and the position of the pinhole 52 formed in the backing paper 51 are not shifted, but are shifted. For the same reason, the powder does not blow out together with the transport air, and the transport air can be exhausted in a shorter time than the paper bag of the embodiment shown in FIG.

In each of the above-described embodiments, the bonding between the backing sheets 20, 31, 45, 51 and the mouth closing surface (part) is performed by using the band-shaped bonding portion 2 extending in the width direction of the bag body.
Although the bonding was performed at 1, 49, the present invention is not limited to this, and the bonding is performed using a plurality of band-shaped bonding portions provided along the longitudinal direction of the bag body or a large number of bonding portions applied in a dot shape. It goes without saying that it may be done.

[0038]

As described above, according to the paper bag with the blowing port of the present invention, the blowing paper is provided at the opening of the cylindrical bag body, and the paper is applied to the opening-closing portion which is closed. Adhered by a point-like adhesive part, by forming a plurality of pin-holes communicating with the inside of the bag body and the atmosphere in the mouth closing part, regardless of the bottom-attached bag or folded-bag, without sewing Even with a paper bag attached to the mouth closure of the bag body with adhesive, the air that can be transported when filling the contents such as powder and fine granular material is well escaped and the contents do not blow out. Spouted paper bags can be provided.

[Brief description of the drawings]

FIG. 1 is a front view partially showing a mouth portion of a bottom-attached bag-type paper bag with a blowing port according to an embodiment of the present invention.

FIG. 2 is a front view partially showing the mouth end of the bag main body in the process of forming the mouth of the paper bag with the blowing mouth shown in FIG.

FIG. 3 is a front view showing the entire bag body showing a forming process of the paper bag with the blowing port shown in FIG.

4 is a front view showing the entirety of the paper bag with a blow-out port completed by continuously assembling the paper bag with a blow-out port shown in FIG. 3;

5 is a configuration explanatory view showing a state in which powder is blown into the paper bag with a blowing port shown in FIG. 4 using a powder filling device.

FIG. 6 is a partial cross-sectional view of the paper bag with the blowing port shown in FIG.

FIG. 7 shows a paper bag with a blow-out port according to another embodiment in which a pinhole for ventilation is also formed in the backing paper, when the powder is blown in the same manner as in FIG. It is a partial sectional view.

FIG. 8 is a front view partially showing a mouth portion of a paper bag with a blowing port of a folding bag type according to another embodiment of the present invention.

FIG. 9 is a schematic cross-sectional view showing a cut-away portion of the folding-bag type paper bag with a blowing port taken along line 9-9 in FIG.

FIG. 10 is a partial cross-sectional view of the paper bag with the blowing port shown in FIG.

FIG. 11 shows a paper bag with a blowout port according to another embodiment in which a pinhole for ventilation is also formed in the backing sheet, when the powder is blown in the same manner as in FIG. It is a partial sectional view.

FIG. 12 is a partial front view showing a ventilation hole formed in a wall surface near a mouth portion in a conventional paper bag with a bottom-attached bag type blowing port.

FIG. 13 is a front view showing a conventional valve mouth double sewing bag.

[Explanation of symbols]

 10, 30, 40 Paper bag with blow-in port 11 Side fold line 12, 42 Bag body 13 Inclined fold line 14 Side fold 15 Front tongue piece 16 Rear tongue piece 17, 32, 48 Pinhole 18 Paper piece for filling valve 19, 44 Mouth closing part 20, 31, 45, 51 Backing paper 21, 49 Bonding part 22, 46 Blow-in port 23 Mouth 24 Bottom

Claims (4)

[Claims] 1. A tubular bag body comprising one or more layers of paper and having a flattened state at both side folding lines, having a mouth closing portion provided with a blowing valve at a mouth portion. In a paper bag for filling powder or microparticles formed by laminating and adhering a sheet of paper to the mouth closing portion, a plurality of pinholes for communicating the inside of the bag body with the atmosphere are provided in the mouth closing portion. Forming
A paper bag with a blowing port, wherein the backing sheet is bonded to the mouth closing portion by a band-like or point-like bonding section, and the pinhole is formed in a non-bonding section with the backing sheet. 2. A plurality of pinholes are also formed on the non-adhesive portion of the backing sheet with the mouth closing portion, and a position of the pinhole formed in the mouth closing portion and the pinhole are formed on the backing sheet. 2. The paper bag with a blow-off port according to claim 1, wherein the positions of the pinholes are shifted without overlapping. 3. The mouth closing portion is folded into the center of the bag body while opening both sides of the mouth of the bag body so as to form two inclined fold lines connected to the respective side fold lines. Forming both side folding parts, bending the front tongue piece and the rear tongue piece formed between the folding parts on both sides into the inside of the opening part and overlapping their tips with each other to form a hexagonal shape as a whole 3. The paper bag with a blow-off port according to claim 1, wherein the backing paper is overlapped and adhered thereon and on the both side folded portions. 4. 4. The mouth closing part is formed by folding a corner of the mouth of the bag body into a bag to form a blowing port, and bending the mouth end of the bag body toward one wall surface side, 3. A paper bag with a blowing port according to claim 1 or 2, wherein a contact paper is adhered so as to straddle the mouth closing portion.