JP2012035903A - Paper bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper bag, in which operation to separate a paper cylindrical object and a cylindrical object at the most inner layer can be performed very easily and the separating operation can be performed in a state that adhesion of a foreign material or the like on the inner and the outer surface of an inner bag formed of the cylindrical object at the most inner layer and mixture in of a machine sewing thread are prevented as much as possible.SOLUTION: A groove 11, which parts a heat sealing part 10 by the gravity of a storing object in the paper bag and separates the paper cylindrical object 4 forming an outer bag 4a from an inner bag 3a by the parting, is formed at the heat sealing part 10 of a mouth part 2a by a score cut and the groove 11 is arranged at a folding part 2d with a U-shaped cross section which is formed by folding a bag body 2 and a seal paper 8 once at the heat sealing part 10 of the mouth part 2a and a recess 33 to be raised is formed at both ends of the paper bag 1 in the width direction at the folding part 2d and when the recess 33 is raised after an opening tape 7a at a bottom part 2b is pulled, the paper cylindrical object 4 and the inner bag 3a are separated.

Description

  The present invention relates to a paper bag formed of a multilayered cylindrical body, and more particularly to a paper bag in which the innermost cylindrical body is heat-sealed.

  Conventional paper bags include paper bags (paper heavy bags) in which other layers are stacked on the inner side of a paper layer forming the outer surface of the paper bag in order to provide functions such as moisture proofing or improved sealing. This conventional paper bag usually includes a bag body having both ends open and having a multi-layered cylindrical body (see Prior Art Document 1).

10 is a conceptual cross-sectional view of a conventional paper bag, and FIG. 11 is a conceptual plan view of the paper bag of FIG. FIG. 10 and FIG. 11 are views showing a state in which the contents are sealed from the mouth portion of the paper bag by filling the contents. 10 and FIG. 12 described later, the same parts as those in FIG. 10 are denoted by the same reference numerals. 10 to 12 conceptually show the structure of the conventional paper bag for easy understanding.
As shown in FIGS. 10 and 11, a conventional paper bag 101 includes a bag body 2 having both ends opened and having a multi-layered cylindrical body.

Among these, the bag body 2 includes an innermost cylindrical body 3 and a paper cylindrical body 4 disposed on the outer periphery of the innermost cylindrical body. A cylindrical body to be heat-sealed, which is usually formed of or includes a non-combustible material or an incombustible material.
In addition, the paper tubular body 4 includes a first paper tubular body 5 that covers the outside of the innermost tubular body 3, and a second paper tubular body 6 that covers the outside of the first tubular body 5. It is composed of

  As shown in FIG. 10, the glue part 12 is interposed between the first cylindrical body 5 and the innermost cylindrical body 3 in one of the openings at both ends of the bag body 2. is doing. The glue portion 12 is made of glue that bonds the first cylindrical body 5 and the innermost cylindrical body 3 together. As shown in FIG. 11, the glue of the glue portion 12 is arranged in a dot shape along the width direction of the bag body 2.

The other opening of the bag body 2 is formed by bending the bag body 2 around the center of the bag body 2 by one turn and then folding the backing paper 7 with the opening tape 7 a attached to the folded bag body 2. The opening is sealed by sticking to the bag body 2 which is not formed with glue 15, thereby forming the bottom 2 b.
Further, the one opening of the bag body 2 is a mouth portion 2a for filling the accommodation 61, and a patch 7 with an opening tape 7a is attached to the mouth portion 2a. A hot melt adhesive 9 is previously applied to the sheet 7 of the mouth 2a.

  In this paper bag 101, after the container 61 is filled from the mouth portion 2a, the end portion on the mouth portion 2a side of the innermost cylindrical body 3 is heat-sealed (adhesion by heat), and then this heat-sealed portion (Hereinafter referred to as a heat seal portion.) The end portion of the bag body 2 is bent once from the center in the longitudinal direction from 10, and the backing paper 7 with the opening tape 7a of the mouth portion 2a is attached to the bag body 2 with the hot melt adhesive 9. When pasted, the mouth 2a can be sealed. As shown in FIG. 10, the glue part 12, the heat seal part 10, and the hot melt adhesive 9 do not appear on the surface of the paper bag 101, but in FIG.

Further, in this paper bag 101, as shown in FIGS. 10 and 11, when the mouth 2a and the bottom 2b are sealed, an inner bag 3a is formed by the innermost cylindrical body 3 and is accommodated in the inner bag 3a. The outer bag 4a covering the inner bag 3a is formed by the paper tubular body 4 so that the object 61 is accommodated. From this state, the inner bag 3a and the paper tubular body 4 constituting the outer bag 4a can be separated.
In order to perform this separation, first, the bottom 2b is unsealed by pulling the opening tape 7a of the bottom 2b, and then the folding of the bottom 2b is released, and then the opening 2a is opened by pulling the opening tape 7a of the mouth 2a. The bending of the mouth portion 2a is released.
Then, as shown by an arrow E in FIG. 12, the paper tubular body 4 forming the outer bag 4a is pulled away from the inner bag 3a. Then, the tubular body 4 and the inner bag 3a can be separated.
FIG. 12 is a conceptual diagram for explaining the operation of separating the paper cylindrical body and the inner bag of the paper bag of FIG.

In addition, the conventional paper bag includes a paper bag that covers the mouth 2a, the bottom 2b, or both of the opening of the bag body with a sealing band, and is sealed by sewing with a sewing thread from above each sealing band. Among the conventional paper bags, the mouth 2a is sealed with a sewing thread. When sealing the mouth 2a, the end of the mouth 2a is made as horizontal as possible to ensure the sewing with the sewing thread. The portion 2a is trimmed, and then the mouth portion 2a is stitched with a sewing thread.
Further, in a conventional paper bag that seals the mouth 2a, the bottom 2b or both with a sewing thread, the inner bag 3a is sealed by heat sealing the mouth 2a and the bottom 2b of the innermost cylindrical body 3. A paper bag has been proposed in which a groove by score cutting is formed in the heat seal portion of the mouth portion 2a to separate the paper tubular body 4 and the inner bag 3a constituting the outer bag 4a. In the conventional paper bag 111 (FIG. 8 (b)) in which a groove by score cut is formed in the heat seal portion of the mouth portion 2a, by lifting both ends of the sealing band 112 of the mouth portion 2a, a paper tubular body 4 and the inner bag 3a are separated.

Japanese Patent Publication No. 7-94256

  By the way, the conventional paper bag 101 (FIG. 10) in which both the mouth 2a and the bottom 2b of the bag body 2 are sealed with the backing paper 7 with the opening tape 7a is a cylindrical body of paper that forms the outer bag 4a. In order to separate 4 from the inner bag 3a, it is necessary to open the mouth 2a and the bottom 2b by pulling the opening tape 7a. For this reason, there is a problem that the separation operation is complicated.

  Further, in this paper bag 101, the paper tubular body 4 that forms the outer bag 4a of the mouth portion 2a and the inner bag 3a are bonded by the glue of the glue portion 12, so that as shown in FIG. When the paper tubular body 4 and the inner bag 3a are separated, there is also a problem that the separation work becomes complicated due to the adhesive strength of the glue portion 12.

  Further, the glue 12b of the glue portion 12 that has adhered the first tubular body 5 and the innermost tubular body 3 adheres to the outer surface of the inner bag 3a after being separated from the paper tubular body 4. In addition, there is a problem in that the paste 12b may adhere to a powder-like container 61 such as paper powder or something (foreign matter) other than the container 61 such as dust. For example, if the powdery container 61, which is a food, adheres to the paste 12b, it also causes mold, which causes an undesirable situation in terms of food hygiene.

Further, in the conventional paper bag in which the mouth portion 2a, the bottom portion 2b or both of the bag body 2 is sealed with sewing thread, the mouth portion 2a can be separated from the inner tubular bag 3a and the paper tubular body 4 constituting the outer bag 4a. Since it is necessary to release the stitched sewing thread that seals at least one of 2a or the bottom part 2b, the container bag is filled with the sewing thread when separating the tubular body 4 and the inner bag 3a. There is also a problem that the separation work becomes complicated due to the problem of being mixed in 61 and the trouble and inexperience of unraveling the sewing thread.
Further, in the conventional paper bag 111 (FIG. 8B) in which a groove by score cut is formed in the heat seal portion of the mouth portion 2a, by lifting both ends of the sealing band 112 of the mouth portion 2a, a paper tube shape Since the body 4 and the inner bag 3a are separated, there is also a problem that the paper bag 111 may be broken from the position of the sewing thread 113 of the sealing band 112 that is lifted when the gravity of the accommodation 61 is large.

  In view of the above-described circumstances, the present invention is simple and extremely easy to separate the paper bag forming the outer bag from the inner bag formed by the innermost cylinder. Therefore, the separation operation can be performed in a short time, and the separation is performed in a state where foreign matter adheres to the inner surface and the outer surface of the inner bag and the mixing of the sewing thread is prevented as much as possible. It is an object of the present invention to provide a paper bag that can be performed and that prevents the paper bag from being torn during separation as much as possible.

  In order to solve the above-mentioned problems, the paper bag of the present invention has a bag body having both ends opened and having two or more cylindrical layers, and the bag body has an inner peripheral surface bonded by heat sealing. An innermost cylindrical body that forms a bag; and a paper cylindrical body that is disposed on an outer periphery of the innermost cylindrical body and forms an outer bag, and is located at each opening of the bag body. It has a heat seal part formed by adhering the inner peripheral surfaces of the innermost cylindrical body by heat sealing, and a hot melt adhesive is attached to the bag main body at the mouth part of the opening of the bag main body for filling the contents. A sealing paper pre-applied with an agent and attached to the bag body by the hot melt adhesive, and the cylindrical body of the paper and the cylindrical body of the innermost layer are bonded A paste portion is arranged, and the mouth portion is formed by folding the bag body and the sealing paper. The sealing paper is sealed with the hot melt adhesive, and the opening that is different from the mouth of the opening of the bag body has an opening tape that is attached to the bag body. In the paper bag that is sealed by the paper with the opening tape after the bag body is folded, the heat seal part formed in the mouth part is more than the glue part. Located near the center of the bag body, the heat seal part of the mouth part is divided by the gravity of the contents of the paper bag, and the outer bag is formed by the division. A groove for separating the tubular body of the paper and the inner bag is formed by score cutting, and the groove body is formed by bending the bag main body and the sealing paper once from the heat seal portion of the mouth. Formation Are formed in bent portions having a U-shaped cross section, and by forming the bent portions, recessed portions to be lifted are formed at both ends in the width direction of the paper bag, and the recessed portions are formed after the opening tape on the bottom portion is pulled. When lifted, the tubular body of paper forming the outer bag and the inner bag are separated.

  In the paper bag of the present invention, the heat seal portion formed in the mouth portion is disposed closer to the center of the bag body than the glue portion for bonding the paper tubular body and the innermost tubular body, In the heat seal part, the heat seal part of the mouth part is divided by the gravity of the contents of the paper bag, and a groove that separates the inner cylindrical bag from the paper cylindrical body forming the outer bag by the division is score cut The groove is disposed in a bent portion having a U-shaped cross section formed by bending the bag body and the sealing paper once from the heat seal portion of the mouth, and by forming the bent portion, When the concave part to be lifted is formed at both ends in the width direction of the paper bag and the concave part is lifted after the opening tape on the bottom is pulled, the tubular body of the paper forming the outer bag and the inner bag are separated. So, according to the paper bag of the present invention, the outer bag Separating the paper cylinder formed from the inner bag formed by the innermost cylindrical body is simpler and easier than before, so this separation work can be done in a short time. In addition, the separation can be performed in a state in which foreign matter or the like adheres to the inner and outer surfaces of the inner bag and the mixing of the sewing thread is prevented as much as possible, and the paper bag is torn during the separation. It is possible to provide a paper bag in which this is prevented as much as possible.

FIG. 1 is a conceptual plan view of a paper bag according to an embodiment of the present invention, and particularly shows a state in which the mouth portion is sealed by filling the contents from the mouth portion. FIG. 2 is a schematic cross-sectional view showing a state in which the contents are stored in the paper bag of FIG. FIG. 3 is a conceptual cross-sectional view showing a state of heat sealing in order to fill the contents from the mouth of the paper bag of FIG. 2 and seal the mouth. FIG. 4 is an enlarged schematic cross-sectional view of a main part showing a state in which a groove is formed by score cutting in order to seal the mouth part after filling the contents from the mouth part of the paper bag of FIG. FIG. 5 is a conceptual plan view of the paper bag of FIG. 1 and shows a state immediately after forming a groove by score cut in the middle of sealing the mouth. 6 (a) is an enlarged conceptual diagram of the main part of FIG. 2, and FIG. 6 (b) is a conceptual sectional view of the main part of a conventional paper bag showing a part corresponding to FIG. 6 (a). FIG. 7 is a conceptual diagram for explaining the operation of separating the paper tubular body and the innermost tubular body of the paper bag of FIG. FIG. 8A is a diagram for explaining the operation of separating the paper cylindrical body and the inner bag of the paper bag of FIG. 2, and is a conceptual perspective view showing a concave portion that is a lifted portion of the paper bag. FIG. 9B is a conceptual perspective view showing a conventional paper bag lifting portion corresponding to FIG. FIG. 9 is a conceptual diagram illustrating the operation of separating the paper cylindrical body and the inner bag of the paper bag 1 of FIG. FIG. 10 is a conceptual cross-sectional view of a conventional paper bag, and particularly shows a state in which the contents are sealed from the mouth of the paper bag by filling the contents. FIG. 11 is a conceptual plan view of the paper bag of FIG. 10, and particularly shows a state in which the contents are filled from the mouth of the paper bag and the mouth is sealed. FIG. 12 is a conceptual diagram illustrating the operation of separating the paper tubular body and the inner bag of the paper bag of FIG.

  The paper bag of the present invention will be described in detail below based on the paper bag of the example.

FIG. 1 is a conceptual plan view of a paper bag according to an embodiment of the present invention, and particularly shows a state in which an opening is filled with an object to be sealed, and FIG. 2 is an object to be stored in the paper bag of FIG. It is a figure which shows a mode that it accommodated, Comprising: It is a conceptual sectional drawing which shows a mode that it cut | disconnected in the principal part cross section of FIG.
1 to FIG. 9 to be described later, the same parts as those in FIGS. 10 to 12 are denoted by the same reference numerals, and the structure of the paper bag is conceptually illustrated to facilitate understanding of the invention.
This paper bag 1 is a bag without pleats (a flat-body type bag).
A bag main body 2 having openings at both ends of the paper bag 1 includes an innermost cylindrical body 3 and a paper cylindrical body 4 disposed on the outer periphery of the innermost cylindrical body 3.
Among these, the paper tubular body 4 includes a first paper tubular body 5 covering the outer periphery of the innermost tubular body 3 and a second paper tubular body covering the outer periphery of the paper tubular body 5. 6.
The second cylindrical body 6 of the paper cylindrical body 3 is formed of sheet-like paper in which the ends 6a and 6b forming the mouth 2a or the bottom 2b are linearly cut. In this sheet-like paper, both ends 6c, 6d in the width direction are also cut in a straight line, so that both ends 6c, 6d are overlapped to form a trunk portion 6e, and at the time of the overlapping, the innermost cylindrical shape When the first cylindrical body 5 covering the outer periphery of the body 3 is further covered from the outer periphery, a paper second cylindrical body 6 can be made.
Further, the first tubular body 5 of paper is also formed from a sheet-like paper similar to the second tubular body 6 and can be made by the same method as the second tubular body 6 described above. The second cylindrical body 6 is different in that only the innermost cylindrical body 3 is covered from its outer periphery. The first cylindrical body 5 and the second cylindrical body 6 are bonded together by glue 16 (FIG. 2) when the bag body 2 is made.
Moreover, the cylindrical body 3 of the innermost layer is a cylindrical body whose inner peripheral surfaces are bonded to each other by heat sealing, and is usually formed of a non-combustible material or a material suitable for incineration, or a material including this. Yes.
For example, the innermost cylindrical body is formed of a polyethylene cylindrical body.

Further, in the paper bag 1, in the bag main body 2, a paste portion 12 that bonds the first cylindrical body 5 and the innermost cylindrical body 3 is disposed in at least one opening.
In this embodiment, as shown in FIG. 2, the glue portion 12 is disposed in a mouth portion (described later) 2a that fills the container 61, and the glue portion 12 is a first cylinder of paper located in the mouth portion 2a. It is interposed between the cylindrical body 5 and the innermost cylindrical body 3. The glue portion 12 is made of glue, and is arranged linearly along the width direction of the bag body 2 as shown in FIG.

One of the openings of the bag body 2 described above forms a mouth portion 2 a that is filled with the accommodation 61.
The other opening of the bag body 2, that is, the bottom 2 b, which is an opening different from the mouth portion 2 a, is bent one time near the center of the bag body 2 and then folded into the folded bag body 2. The attached sheet 7 with the opening tape 7a is attached to the unfolded bag body 2 with glue 15 so that the bottom 2b is sealed.
It should be noted that there is no adhesive such as glue for bonding the two between the paper cylindrical body 4 and the innermost cylindrical body 3 located at the bottom 2b, and the two are not bonded.
The inner surfaces of the innermost cylindrical body 3 located at the bottom 2 b are bonded together by heat sealing as indicated by reference numeral 10. The details of the backing paper 7 with the opening tape 7a are disclosed in Patent Document 1 and the like.

A sealing paper 8 for sealing the mouth 2a is attached to the bag body 2 of the mouth 2a. The sealing paper 8 is made of kraft paper made of the same material as the backing paper 7, and the opening tape 7 a is not formed on the sealing paper 8.
A hot melt adhesive 9 is applied to the sealing paper 8 in advance, and the sealing paper 8 is attached to the bag body 2 by the hot melt adhesive 9 as will be described later. Reference numeral 17 denotes an adhesive which is interposed between the backing paper 7 before sealing of the bottom portion 2b and the bag body 2 or adheres both, or between the sealing paper 8 before sealing of the mouth portion 2a and the bag body 2. It is an adhesive that intervenes and bonds the two.

FIG. 3 is a conceptual cross-sectional view showing a state of heat sealing in order to fill the contents from the mouth portion of the paper bag of FIG. 2 and seal the mouth portion. As shown in FIG. 3, in the paper bag 1, the mouth 2 a is widened as indicated by an arrow A, and the accommodation 61 is filled from the mouth 2 a as indicated by an arrow B. In addition, the dashed-dotted line of FIG. 3 has shown the mode that the opening part 2a was spread. After the accommodation 61 is accommodated, the inner peripheral surfaces of the innermost cylindrical bodies 3 of the mouth portion 2a facing each other are heat-sealed (adhered by heat).
By this heat sealing, the inner peripheral surfaces of the innermost cylindrical body 3 positioned closer to the center of the bag body 2 than the glue portion 12 are bonded to each other. The heat seal is formed in a line shape along the width direction of the paper bag 1 (FIG. 5) and is performed from the outer surface of the paper bag 1.
Moreover, as shown in FIG. 3, the width W of the heat seal part 10 is about 10 mm. This heat sealing can be performed by a conventional heat sealing jig 30.
In the heat-sealed paper bag, as shown in FIG. 2, the innermost tubular body 3 is sealed by the heat seal portions 10 of the mouth portion 2a and the bottom portion 2b to form an inner bag 3a. Inside the container 61 is housed and sealed.

Next, as shown in FIG. 4, a groove 11 by score cut is formed in the heat seal portion 10. The formation position of the groove 11 is in the middle of the heat seal portion 10 and is formed linearly along the width direction of the paper bag 1.
The score cut is a technique for forming a groove (slit) in the material by pressing a blade or a protrusion directly or indirectly against the material.
This score cut is performed before the heat sealing heat is cooled, and is performed on the innermost cylindrical body 3 via the second cylindrical body 6 and the first cylindrical body 5.
As will be described later, the groove 11 divides the heat seal portion 10 by the gravity of the container 61 of the paper bag 1, and the inner bag 3 a formed by the innermost cylindrical body 3 and the outer bag by the division. It is a groove | channel which isolate | separates from the cylindrical body 4 of the paper which forms 4a.
As shown in FIG. 4, the score cut is made up of a rotatable roll 31 having protrusions on the peripheral surface and a rotatable roll 32 having no protrusions on the peripheral surface. It is formed by a conventional device that forms a groove 11 by pressing against the outer surface of the second cylindrical body 6 of the paper bag 1 in contact with 32.
As shown in FIG. 5, the groove 11 is formed in the heat seal portion 10 of the mouth portion 2a among the heat seal portions 10 of the mouth portion 2a and the bottom portion 2b. The groove 11 is formed closer to the center of the bag body 2 than the glue portion 12 for bonding the paper tubular body 4 and the innermost tubular body 3.
FIG. 4 described above is an enlarged schematic cross-sectional view of a main part showing a state in which a groove is formed by score cutting in order to seal the mouth part after filling the contents from the mouth part of the paper bag of FIG. FIG. 5 is a conceptual plan view of the paper bag of FIG. 1 and shows a state immediately after groove formation by score cut in the middle of sealing the mouth.

Next, as shown by the arrow C in FIG. 4 and FIG. 6A, the bag body 2 and the sealing paper 8 are bent once from the heat seal portion 10 at the mouth. The bag body 2 and the sealing paper 8 to be bent are one end portions including the glue portion 12 of the paper bag 1. By this one-time bending, the bag body 2 is formed with a bent portion 2d having an inverted U-shaped cross section, and the groove 11 is disposed in the bent portion 2d.
Further, by forming the bent portion 2d, as shown in FIG. 8 (a), concave portions 33 are formed at both ends in the width direction of the paper bag.
After that, when the sealing paper 8 of the mouth portion 2a is adhered to the bag body 2 with the hot melt adhesive 9, the mouth portion 2a can be sealed, whereby the outer bag 4a covering the inner bag 3a is formed by the paper tubular body 4. It is formed.
6 (a) is an enlarged conceptual diagram of the main part of FIG. 2, and FIG. 6 (b) is a conceptual sectional view of the main part of a conventional paper bag showing a part corresponding to FIG. 6 (a). A two-dot chain line in FIG. 6A illustrates a fold line serving as a fold reference.

Thus, in the paper bag 1 in which the container 61 is accommodated and the mouth portion 2a is sealed, the tubular body 4 and the inner bag 3a of the paper forming the outer bag 4a can be separated.
7 to 9 are conceptual diagrams for explaining the operation of separating the paper tubular body 4 and the inner bag 3a of the paper bag 1 of FIG.
In order to perform this separation, as shown in FIG. 7, first, the opening tape 7a of the bottom 2b is drawn. Then, the bottom 2b is opened, and the bending (one bending) of the bottom 2b is released.
Next, as shown by arrows D in FIGS. 8A and 9, the pair of recesses 33 formed by the bent portions 2 d of the paper tubular body 4 are lifted. Then, the one end part including the glue part 12 of the cylindrical body 4 of paper is lifted. Reference numeral G denotes a table or a ground on which the paper bag 1 is placed.
Further, the bent portion 2d forming the concave portion 33 is provided with the groove 11 by score cut.
Therefore, when the concave portion 33 is lifted as shown in FIG. 9, the heat seal portion 10 is divided into a heat seal portion 10 a on the glue portion 12 side and a heat seal portion 10 b on the containment 61 side by the gravity of the contained matter 61. In addition, by this division, the paper tubular body 4 having the glue part 12 and having the heat seal part 10a on the glue part 12 side with respect to the groove 11, and the heat seal part on the container 61 side with respect to the groove 11 The inner bag 3a formed of the innermost cylindrical body 3 having 10b is pulled away, and the inner bag 3a and the paper cylindrical body 4 forming the outer bag 4 are separated.
The paper tubular body 4 is pulled along the outer surface of the inner bag 2a filled with the accommodation 61 and lifted away from the innermost tubular body 3 by lifting the concave portion 33, and the final state as described above. Thus, the paper tubular body 4 and the inner bag 3a are separated.
After the separation, the inner bag 3a is sealed with respect to the groove 11 by the heat seal part 10b on the container 61 side and the heat seal part 10 on the bottom part 2b, and therefore has a sealed state in which the container 61 is accommodated. maintain.

When the inner bag 3a and the paper tubular body 4 forming the outer bag 4 are separated by lifting the recess 33, the inner bag 3a and the glue portion 12 are separated by a groove 11 at a position different from the glue portion 12. The innermost cylindrical body 3 to which is attached is cut, and the glue portion 12 does not appear on the outer surface of the inner bag 3a.
Therefore, the separation can be performed in a state where the adhesive portion 12 is prevented as much as possible from adhering to the outer surface of the inner bag 3a.
Therefore, there is a possibility that glue adheres to the outer surface of the inner bag 3a, and that the paste (powder 61) such as paper dust or something other than the container 61 (foreign matter) such as dust adheres to the glue as much as possible. Is prevented. Therefore, it is possible to prevent as much as possible the possibility that powdery accommodation 61 as a food adheres to the glue and mold is generated, causing an undesirable situation in food hygiene.
Moreover, since the inner bag 3a maintains the state sealed by the heat seal portion 10b on the container 61 side and the heat seal portion 10 on the bottom portion 2b during the above-described separation operation, foreign matter is contained on the inner surface of the inner bag 3a. The separation can be performed in a state where the possibility of mixing into the object 61 is prevented as much as possible.

Further, in this paper bag 1, when separating the paper cylindrical body 4 and the inner bag 3a, the innermost layer cylinder to which the inner bag 3a and the glue portion 12 are attached is located in the groove 11 at a position different from the glue portion 12. Since the solid body 3 is cut, the separation operation is not affected by the strength of the adhesive force of the glue portion 12. Therefore, the separation operation is extremely easy as compared with the conventional paper bag 101.
In the conventional paper bag 101 (FIG. 11), the glue portion 12 is arranged in the form of dots in order to reduce the adhesive force as much as possible and facilitate the above separation work. In the paper bag 1, it is not necessary to consider the separation operation when the glue portion 12 is arranged. Therefore, the glue portion 12 can be made of glue arranged linearly along the width direction of the paper bag 1. . Further, when the glue part 12 is composed of glue arranged linearly along the width direction of the paper bag 1, the adhesive strength between the innermost cylindrical body 3 and the paper cylindrical body 4 compared to the conventional paper bag 101. Therefore, it is possible to prevent the innermost cylindrical body 3 and the paper cylindrical body 4 from being displaced from each other as much as possible when the container 61 is filled or stored. It is also possible to prevent the inclusion 61 from being mixed between the first cylindrical body 5 and the innermost cylindrical body 3.

In this paper bag 1, as described above, after pulling the opening tape 7a of the bottom portion 2b, the folding of the bottom portion 2b is released, and the concave portion 33 is simply lifted, whereby the paper that forms the outer bag 4a is removed. Since the tubular body 4 and the inner bag 3a are separated, the opening tape 7a is pulled as compared with the conventional paper bag 51 in which both the opening 2a and the bottom 2b are opened by pulling the opening tape 7a. The operation of separating the tubular body 4 of the paper forming the outer bag 4a and the inner bag 3a is simpler and easier than the conventional paper bag. Work can be done in a short time.
Further, in this paper bag 1, there is no need to release the folding of the mouth portion 2a in order to separate the paper tubular body 4 and the inner bag 3a, and accordingly, the paper tubular body 4 and the inner bag 3a. Is simpler than the conventional paper bag 101, and can be performed very easily. Therefore, the separation operation can be performed in a short time.

Further, in this paper bag 1, since the mouth 2a, the bottom 2b, or both are not sealed by sewing thread, unlike the conventional paper bag, the paper tubular body 4 and the inner bag 3a are separated. At this time, the sewing thread is not mixed into the container 61 filled in the paper bag 1 by releasing the stitched sewing thread that seals at least one of the mouth 2a or the bottom 2b. Therefore, the separation can be performed in a state where mixing of the sewing thread is prevented as much as possible.
Further, the paper bag 1 does not seal the mouth portion 2a, the bottom portion 2b, or both by sewing with a sewing thread unlike the conventional paper bag, so when separating the paper tubular body 4 and the inner bag 3a. In addition, it is not necessary to release the stitched sewing thread that seals at least one of the mouth portion 2a and the bottom portion 2b, and there is no need for labor and experience of unraveling this stitching. Therefore, in this paper bag 1, the above-described separation operation is simple and extremely easy as compared with the conventional paper bag, and therefore this separation operation can be performed in a short time.

Further, in the paper bag 1, the recessed portion 33 to be lifted is formed by a bent portion 2d having a U-shaped cross section formed by bending the bag body 2 and the sealing paper 8 once from the heat seal portion 10 of the mouth portion 2a. ing. Since the inner surface of the recess 33 is formed by the bag body 2, the sealing band 112, which is the lifting portion, is replaced with that of the conventional paper bag 111 attached to the bag body 2 as shown in FIG. In comparison, when separating the paper tubular body 4 and the inner bag 3a, the paper bag 1 is prevented from being broken as much as possible when the gravity of the container 61 is large.
Moreover, the sealing paper 8 that is folded together with the bag body 2 of the folded portion 2d has a mechanical strength higher than that of the sealing band 112 for sewing with a sewing thread of the conventional paper bag 111 (FIG. 8B). Since it is strong, the mechanical strength of the lifted portion (recess 33) is stronger than that of the conventional paper bag 111. Therefore, even when the gravity of the container 61 is large, the paper bag 1 can be torn as much as possible. To be prevented.
Further, when the lifting position of the paper bag 1 is the concave portion 33 as in this paper bag 1, since the operator's hand / finger can be caught in the concave portion 33, the conventional paper bag 111 (lifting both ends of the sealing band 112 ( Compared with FIG. 8 (b)), the lifting operation is also simpler. Therefore, the separation operation is much easier than the conventional paper bag 111, and the separation operation can be performed in a short time.
FIG. 8A is a diagram for explaining the operation of separating the paper cylindrical body and the inner bag of the paper bag of FIG. 2, and is a conceptual perspective view showing a concave portion that is a lifting portion of the paper bag. 8 (b) is a conceptual perspective view showing a conventional paper bag lifting portion corresponding to FIG. 8 (a).

  As described above, the present invention has a bag body 2 having both ends open and having two or more cylindrical layers, and the bag body 2 has an inner peripheral surface bonded by heat sealing. It has an innermost cylindrical body 3 that forms a bag and a paper cylindrical body 4 that is disposed on the outer periphery of the innermost cylindrical body 3 and forms an outer bag. The heat sealing portion 10 is formed by adhering the inner peripheral surfaces of the innermost cylindrical body 3 located at the mouth portion 2a and the bottom portion 2b) by heat sealing. A sealing paper 8 to which a hot melt adhesive 9 has been applied in advance and attached to the bag body 2 by the hot melt adhesive 9 is attached to the main body 2. A glue portion 12 for bonding the innermost cylindrical body 3 is disposed, and the bag portion 2a is formed by folding the bag body 2 and the sealing paper 8. After being peeled, it is sealed with a hot melt adhesive 9 of the sealing paper 8, and is attached to the bag body 2 and to the bag body 2 on the bottom 2b which is an opening different from the mouth 2a among the openings of the bag body 2. A heat-seal part formed in the mouth part 2a of the paper bag sealed with the paper-sheet 7 with the opening tape 7a after the bag body 2 is folded is attached. 10 is arranged closer to the center of the bag body 2 than the glue portion 12, and the heat seal portion 10 of the mouth portion 2a is divided into the heat seal portion 10 of the mouth portion 2a by the gravity of the contents of the paper bag 1. A groove 11 for separating the paper tubular body 4 forming the outer bag 4a by the division and the inner bag 3a is formed by score cutting, and the groove 11 is formed by the heat seal portion 10 of the mouth portion 2a. The bag body 2 and the sealing paper 8 are It is arranged in a bent portion 2d having a U-shaped cross section formed by being bent, and by forming the bent portion 2d, recessed portions 33 to be lifted are formed at both ends in the width direction of the paper bag 1, and an opening tape for the bottom portion 2b Since the paper tubular body 4 and the inner bag 3a forming the outer bag 4a are separated when the concave portion 33 is lifted after the 7a is pulled, the paper tubular body 4 and the innermost layer are separated. The operation of separating the cylindrical body 3 is simple and extremely easy as compared with the conventional paper bag. Therefore, the separation operation can be performed in a short time, and foreign matter is present on the inner and outer surfaces of the inner bag 3a. The above-mentioned separation can be performed in a state in which adhesion of the sewing machine thread and mixing of the sewing thread is prevented as much as possible, and tearing of the paper bag is prevented as much as possible.

Furthermore, in the paper bag 1 of this embodiment, each cylindrical body (5, 6) of the cylindrical body 4 of the paper has the ends 6a, 6b (in FIG. 1) forming the mouth 2a or the bottom 2b as described above. Since the end 6a, 6b is cut in stages and the specific gravity of the contents 61 is different, the bag size is reduced. A paper bag that needs to be changed by changing the body width of the paper bag, such as a paper bag that needs to be changed, or a valve paper bag that needs to be changed if the specific gravity of the contents is different. Compared to the above, the manufacture of the paper bag 1 is simplified.
The paper bag 1 is a bag without pleats (a so-called flat body type paper bag). Therefore, in other words, compared with a paper bag with pleats (gusset-type bag), heat seal leakage (disconnection) at the heat seal portion 10 is less likely to occur, and leakage of the contents 61 is prevented as much as possible.

  Further, since the paper bag 1 is a multiple bag manufactured using the bag body 2 having the innermost cylindrical body 3, the innermost cylindrical tube is formed inside the paper bag made of the paper cylindrical body 4. Compared to the conventional multiple bag including the step of manually inserting the body 3, the manufacturing cost of the multiple bag can be reduced by the absence of this insertion step.

  In the paper bag 1 of this embodiment, the groove 11 by score cut is formed only in the heat seal portion 10 of the mouth portion 2a. However, the paper bag of the present invention has a paper tube at least in the mouth portion 2a of the bag body. A glue part 12 for bonding the cylindrical body 4 and the innermost cylindrical body 3 is arranged, and the groove 11 is located inside the innermost cylindrical body 3 located closer to the center of the bag body 2 than the glue part 12. What is necessary is just to be formed in the heat seal part 10 which adhere | attaches peripheral surfaces by heat seal.

  In the paper bag 1 of this embodiment, the paper tubular body 4 has been described as being composed of two layers of paper tubular bodies 5 and 6, but the paper bag of the present invention has been described. The number of layers of the body is not limited to this, and it may be a paper bag formed from a layer in which the innermost layer of the paper bag 1 of the present invention is heat-sealed.

  The paper bag of the present invention is suitable for a paper bag in the field for the purpose of improving workability by storing it in a clean room such as food granules.

DESCRIPTION OF SYMBOLS 1 ... Paper bag 2 ... Bag main body 2a, 2b ... Opening part 2a ... Mouth part 2b ... Bottom part 2d ... Bending part 3 ... Inner layer cylindrical body 3a ... Inner bag 4 ... Paper cylindrical body 4a ... Outer bag 5 ... First 1 cylindrical body 6 ... 2nd cylindrical body 7 ... Cover paper with opening tape 7a ... Opening tape
8 ... Sealing paper 9 ... Hot melt adhesive 10 ... Heat seal part 11 ... Groove 12 ... Glue part 33 ... Lifting part

Claims (2)

It has a bag body having both ends open and having two or more cylindrical layers,
The bag body includes an innermost cylindrical body that forms an inner bag by bonding inner peripheral surfaces by heat sealing, and a paper tube that is disposed on the outer periphery of the innermost cylindrical body to form an outer bag. And
Including a heat seal portion formed by adhering the inner peripheral surfaces of the innermost cylindrical bodies located at the respective openings of the bag body by heat sealing;
Of the opening of the bag body, the opening for filling the contents is a sealing paper preliminarily coated with the hot melt adhesive on the bag body, and is adhered to the bag body with the hot melt adhesive. While the sealing paper is attached, a paste portion that bonds the cylindrical body of the paper and the cylindrical body of the innermost layer is disposed,
The mouth part is sealed by the hot melt adhesive of the sealing paper after the bag body and the sealing paper are folded, and the bottom part which is an opening different from the mouth part of the opening of the bag body, In the bag body attached to the bag body with an opening tape attached to the bag body, the bottom is sealed with the opening tape after the bag body is folded,
The heat seal part formed in the mouth part is arranged closer to the center of the bag body than the glue part,
The heat seal part of the mouth part is divided by the gravity of the contents of the paper bag to divide the heat seal part of the mouth part, and the paper cylindrical body forming the outer bag by the parting, and the inner A groove that separates the bag is formed by score cutting,
The groove is disposed in a bent portion having a U-shaped cross section formed by bending the bag body and the sealing paper once from the heat seal portion of the mouth portion,
By forming the bent portion, a recessed portion to be lifted is formed at both ends in the width direction of the paper bag,
When the recess is lifted after the bottom opening tape is pulled, the paper cylindrical body forming the outer bag and the inner bag are separated from each other. The first cylindrical body or the second cylindrical body of the paper cylindrical body forming the bag body is formed by a sheet of paper that is cut in a straight line,
The paper bag according to claim 1, wherein the paper bag is a pleated paper bag.

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