JP4711655B2 - Multilayer paper bag - Google Patents

Description

The present invention relates to a multi-layer paper bag for containing a granular material, and more specifically, a film is formed in one opening of a multi-layer cylindrical product having a heat-adhesive plastic film interposed between paper and paper. It is related with the multilayer paper bag which provides the thermal-bonding part by a predetermined interval and closes the other opening part of this cylindrical thing, and becomes a bottom part.

Multi-layer paper bags, when contents such as granular materials are received from the opening, regardless of whether or not a film is interposed between the paper layers, each paper other than the original entrance is opened to prevent the contents from entering. Each layer is mainly closed by adhesion. When this multi-layer paper bag is made of paper only, it is easy to recycle. However, in the multi-layer paper bag in which a film is interposed between the paper layers, the paper and the film are bonded with a special adhesive. It is difficult to separate the film and recycling becomes difficult. In addition, there is a concern about contamination of the bag making apparatus and its surroundings due to the exudation of the special adhesive. Under such circumstances, the following multilayer paper bags are known that are easy to recycle without using an adhesive, although they are multilayer paper bags with a film interposed between the papers.

JP 2002-160742 A

As shown in FIGS. 11 and 12 attached to the present specification, the multilayer paper bag of Patent Document 1 is a cylindrical shape in a multilayer state in which a plastic film b that can be thermally bonded is interposed between paper a and paper a. At least one opening d of the cylindrical object c is thermocompression-bonded together with the plastic film b to serve as corrugated processing, and the adjacent papers a are pseudo welded over the entire width of the opening d. The pseudo welded opening d side becomes the content inlet e, and the other opening f of the cylindrical object c is sealed to form the bottom g. Therefore, according to this multilayer paper bag, since no adhesive is used, there is no inconvenience due to bleeding of the adhesive and the like. It retains the mechanical anti-separation force due to the stamping process, so that there is no opening between the papers a other than the original inlet e and the contents do not enter, and the paper a and the plastic film b can be easily used after use. It can be separated.

In the multilayer paper bag of Patent Document 1, since the adjacent papers a are pseudo welded to each other over the entire width of the opening d, the heat from the thermocompression bonding machine is concentrated without being dispersed, and the plastic film b In some cases, holes are randomly formed, and a portion that is not pseudo-welded may occur. Furthermore, even if each adjacent paper a can be successfully welded without opening a hole, since it is pseudo welded over the entire width of the opening d, air bleeding from the adjacent papers a tends to be insufficient. Therefore, production control during bag making may become troublesome.

Therefore, the object of the present invention is that there is no inconvenience such as bleeding due to the use of an adhesive, and there is sufficient thermal adhesive force that does not open each paper layer when filling the contents, and air can be vented to control production. Another object of the present invention is to provide a multilayer paper bag which is easy and can be easily separated after use and easily recycled.

The present invention has been proposed in order to achieve the above object, and is characterized by having the following configuration.
That is, according to the present invention, it is composed of a multi-layered cylindrical product having a heat-adhesive plastic film interposed between papers, and the paper and paper are provided in one opening of the multi-layered cylindrical product. Thermally adhering portions and non-adhering portions formed of a heat-adhesive plastic film interposed between them are alternately provided in the width direction with respect to the opening portion, and the other opening portion of the multilayer tubular body is provided. Closed and becomes the bottom part, and the thermal adhesive part and the non-adhesive part were intermittently connected to the outer peripheral surface in the state where the heat-adhesive plastic film was softened by the heat sealer applied from the outside of the opening part. A multilayer paper bag formed by running a gear having a convex portion in a pressed state is provided.

In addition, according to the present invention, it is composed of a multi-layered cylindrical product having a heat-adhesive plastic film interposed between papers, and the paper and paper are provided in one opening of the multi-layered cylindrical product. Thermally adhering portions and non-adhering portions by a heat-adhesive plastic film interposed between the opening portion and the opening portion are alternately provided in the width direction and the axial direction , and the other side of the multilayer cylindrical body is provided. The opening is closed to form the bottom , and the heat bonding part and the non-bonding part are pressed from the outside of the opening with a heat sealer having a heat seal bar with the end face intermittently cut out inward. Thus , a multilayer paper bag is provided.
In addition, the heat-bonding part and the non-bonding part are in a state where the heat-adhesive plastic film is softened by the press of the heat sealer having the heat seal bar, and further, a gear having a convex part interrupted on the outer peripheral surface in the part. It may be formed by running in a pressed state.

According to the invention, the thermal bonding portion and the non-bonding portion are formed in a plurality of strips in parallel with the opening, and the non-bonding portion is formed between the thermal bonding portion and the thermal bonding portion. Is provided with the above-mentioned multilayer paper bag formed in a plurality of triangular shapes with the line connecting the inner ends of the bonding portion as the bottom and tapering toward the opening.

Further, according to the present invention, the thermal bonding portion is formed of a plurality of strips alternately having non-bonding portions formed in parallel with the opening and each of which is wider than the thermal bonding portion. The multilayer paper bag is provided in which the heat- bonding part and the non-bonding part are arranged in a face-to-face state.

According to the present invention, in order to provide the thermal bonding portion with a predetermined interval, the thermal adhesive plastic film interposed between the paper in the opening is heated with a predetermined interval. Is transferred to the film without forming a single part to form a uniform heat-bonded part, while the heat-bonded part is formed over the entire circumference of the intervening film. Air escapes from.
Therefore, since no adhesive is used, there is no inconvenience such as bleeding, and when filling the contents,
Each paper layer does not open, the necessary air can be vented, production management is easy, and after use, the paper and film are heat-bonded with a predetermined gap, making it easy to separate and recycle There is.

In addition, since the thermal bonding portion has a predetermined interval in the width direction or the axial direction with respect to the opening portion, unnecessary air in the bag can be easily removed from the non-adhesive portion having the predetermined interval, and the production control can be performed. It becomes easy.
In addition, since the width direction thermal bonding portion is provided with a predetermined interval in the width direction and the axial direction with respect to the opening portion, air is released from the non-adhesive portion with the predetermined interval as described above, and At the time of heat bonding, heat is dispersed by the non-bonded portions at a predetermined interval, and heat is transferred to the film without being scattered in one place to form a homogeneous heat-bonded portion. Good thermal adhesion between the papers.

Furthermore, when the non-adhesive portion is configured as shown in FIG. 9, the non-adhesive portion serving as the air passage in the bag is formed in a triangular shape with the inner side of the bag as the bottom, and therefore unnecessary in the bag. Air becomes easier to escape and production management after filling the contents can be performed more efficiently. Further, in the configuration of FIG. 10, the non-adhesive portion and the non-adhesive portion formed wider than the adhesive portion are arranged facing each other, so unnecessary air in the bag is zigzag between the non-adhesive portions. It is possible to pass through and pass through, preventing intrusion of dust from the outside, and good thermal bonding between the papers.

The best mode for carrying out the present invention will be described below with reference to the drawings.
<Example 1>

1 is a side view showing an embodiment of the multilayer paper bag of the present invention, FIG. 2 is a sectional view of the multilayer paper bag, FIG. 3 is an enlarged sectional view of FIG. 2, and FIG. 4 is a perspective view showing a layer structure of the multilayer paper bag. FIG. 5 and FIG. 5 are process diagrams showing the manufacturing process of the multilayer paper bag.
The multilayer paper bag 1 of the present invention comprises a multilayer tubular product 5 having a heat-adhesive plastic film 4 interposed between the paper 2 and the paper 3, and the paper 2 in one opening 6 of the tubular product 5 Between the paper 3, the heat bonding portions 7 and the non-bonding portions 14 formed by the plastic film 4 interposed therebetween are alternately formed , and the other opening 8 of the cylindrical object 5 is closed to form a bottom portion 9. It will be.

In this embodiment, as shown in FIG. 4, the layer structure of the cylindrical member 5 is composed of three layers in which a heat-adhesive plastic film 4 is interposed between the paper 2 and the paper 3. Further, a film and a paper layer may be sequentially added to form a multilayer structure of five or more layers. The cylindrical object 5 is made by stacking and pasting the end portions of both the papers 2 and 3 and the film 4, and the openings 6 and 8 are formed at both ends thereof. The papers 2 and 3 constituting the layered structure of the cylindrical body 5 are not particularly limited, but usually kraft paper is preferably used, and the film 4 is not particularly limited except that it is heat-adhesive. Films such as polyethylene and polypropylene are used.

The opening 6 of the cylindrical object 5 is provided between the paper 2 and the paper 3 by providing a plurality of thermal bonding portions 7 with a predetermined interval between the paper 2 and the paper 3 and between the paper 2 and the film 4 or the film 4. The multi-layer paper bag 1 is configured such that the gap between the paper and the paper 3 is not opened. And when this multilayer paper bag 1 accommodates the content from the inlet 11, the opening 6 side becomes the inlet 11 of the contents, and the opening 8 side becomes the bottom 9,
Since the space between the paper 2 and the film 4 or the space between the film 4 and the paper 3 does not open, the contents do not enter between them.

Next, a method for forming the thermal bonding portion in the opening 6 of the cylindrical object 5 will be described .
First, a heat sealer is applied to the opening to soften the predetermined width of the film 4, but it has not yet reached thermal bonding, and then immediately on the softened portion 12 of the predetermined width of the film 4, FIG. The gear 13 having a convex portion interrupted on the outer peripheral surface is run in a pressed state, so that the softened portion 12 is made into the heat-bonded portion 7 and the non-bonded portion 14 at a predetermined interval. That is, since the heat bonding part 7 immediately presses against the softened part 12 where the film 4 is softened but not yet heat bonded by the convex part 13a of the gear 13, the paper 2, the film 4 and the paper 3 are heated. are those have configured by a bonding state, the non-adhesion portion 14 of a predetermined interval, because it does not press at the convex portion 13a of the gear 13, and eliminated the softening of the film 4 over time thermoadhesive It is configured to be in a state where it does not. In this way, even in the multi-layer paper bag 1 having the bottom by sticking the paper tape 10 to the opening 8 of the cylindrical object 5 and closing it, excess air in the bag easily escapes from the non-adhesive portion 14 at a predetermined interval. The multilayer paper bag 1 will not be bulky more than necessary.

Next, a method for using the multilayer paper bag 1 configured as described above will be described.
First, the inlet 11 of the multilayer paper bag 1 is opened and filled with contents such as powder particles. At that time, a plurality of thermal bonding portions 7 are provided between the paper 2 and the film 4 or between the film 4 and the paper 3 with a predetermined interval. The contents do not get into any other gap. In addition, the presence of the non-adhesive portions 14 with a predetermined interval allows the air to remain in the bag even if excess air enters between the paper 2 and the film 4 or between the film 4 and the paper 3. There is nothing, and it does not come out of the bag smoothly and is bulky. And it seals by a well-known method, such as sticking the paper tape 10 to the inlet_port | entrance 11 similarly to the case of the bottom part 9, and it is set as a final product.

When the final product is consumed, the inlet 11 of the multilayer paper bag 1 is opened and opened, the contents are taken out from the inlet 11 and used, and when used up, the papers 2 and 3 and the film 4 are separated. Are alternately with the non-adhesive portions 14 with a predetermined interval, so that the papers 2 and 3 and the film 4 can be easily separated. Therefore, the multilayer paper bag 1 can be separated into the papers 2 and 3 and the film 4 and easily recycled, or can be separated and discarded .

FIGS. 6 and 7 show a multilayer paper bag 1a in which a thermal bonding portion is provided in the axial direction with respect to the opening . In the example shown in FIG. Four are provided at predetermined intervals in the direction . And this multilayer paper bag 1a disperses heat to the non-adhesion part 14a of a predetermined interval at the time of heat bonding, and heat is transferred to the film 4 without stagnating to form the above-mentioned homogeneous heat adhesion part 7a. In particular, the thermal bonding between the papers 2 and 3 is good without the film 4 being perforated. In addition, the process of the heat bonding part 7a in the opening part 6 of the cylindrical article 5 of this multilayer paper bag 1a is performed as follows.

That is, as shown in FIG. 7, a heat sealer having a heat seal bar 15 with the end face intermittently cut inwardly is applied to the opening 6 so that the predetermined width of the film 4 is directly heat-bonded. 2, the film 4, and the paper 3 are made into a heat bonding portion 7 a and a non-bonding portion 14 a having a predetermined interval. In this way, even if the heat sealer is applied to the opening 6 of the cylindrical object 5 and the paper 2, the film 4 and the paper 3 are directly heat-bonded as described above, the contact portion of the heat seal bar 15 The heat is dispersed from 15a, the heat is not concentrated on a part of the film 4, and the film 4 is not perforated.

FIG. 8 shows the structure of claim 3 and shows a multilayer paper bag 1b having a thermal bonding portion in the width direction with respect to the mouth portion. In the illustrated example, four thermal bonding portions 7 b and non-bonding portions 14 b are provided in the width direction of the opening 6 and four in the axial direction of the opening 6. In this multilayer paper bag 1b, the width direction thermal bonding portion 7b is provided at a predetermined interval in the width direction and the axial direction with respect to the opening portion 6, so that the non-adhesive portions 14b and 14c having a predetermined interval are provided. Air does not escape and becomes bulky, heat is dispersed to the non-bonded portions 14b and 14c at a predetermined interval during heat bonding, heat is transferred to the film 4 without stagnation, and a hole is not opened, and uniform widthwise heat An adhesive portion 7b is formed. In particular, air venting between the papers 2 and 3 is good, production management is easy, and thermal bonding between the papers 2 and 3 is good.

Processing of the heat bonding portion in the opening 6 of the cylindrical article 5 of the multilayer paper bag 1b is performed as follows.
That is, the heat seal bar 15 of the heat sealer formed as shown in FIG. 7 is applied to the opening 6 to soften the four predetermined widths of the film 4 but not yet thermally bonded, and immediately thereafter the film 5 is run in a pressed state on the four softened portions having a predetermined width, and the softened portion is sandwiched between the four heat-bonding portions 7b in the width direction and a predetermined interval therebetween. The non-thermal bonding portion 14c of the book is used. These four width direction thermal bonding portions 7b are constituted by non-thermal bonding portions 14b alternately.
<Example 2>

The example of the multilayer paper bag 1c shown in FIG. 9 shows the configuration defined in claim 4 , and the thermal bonding portion 7d is parallel to the opening 6, and each has a thermal bonding portion and a non-bonding portion. The non-adhesive portion 14d formed between the heat bonding portions 7d and the heat bonding portion 7d is formed in a plurality of alternating strips, and the bottom line is a line connecting the inner ends 7c of the heat bonding portions. And formed into a plurality of triangular shapes that taper toward the opening 6.
The shape of the non-adhesive portion 14d formed wide on the bottom side smoothly discharges excess air in the bag to the outside of the bag, and from the non-adhesive portion 14d formed on the tapered side on the opening 6 side, the outer dust Will not enter the bag.
In Example 2, the strip-shaped heat-bonded portions are formed in five rows, but the number of rows of the strip-shaped bonded portions is not particularly limited, and is three rows or more in terms of adhesive strength. It is preferable.
<Example 3>

The example of the multi-layer paper bag 1d shown in FIG. 10 shows the configuration defined in claim 5 , and the configuration of the thermal bonding portion is parallel to the opening 6, and each of the thermal bonding portions 7e and , a plurality of band-shaped having a non-adhesive portion 14e which is wider than the heat seal portion alternately, in which each strip of heat-bonded portions 7e and the non-adhesive portion 14e is disposed face-to-face with each other is there.
The feature of the configuration shown in the third embodiment is that pinholes due to shrinkage of the thermal bonding portion can be prevented. That is, the non-adhesive portion 14e which is present between the heat-bonded portion 7e and the thermally adhesive portion 7e is a problem that pinholes are generated in the influence of the shrinkage due to aging after thermal bonding operation, as in Example 3 Since each belt-like thermal bonding portion 7e and the non-bonding portion 14e are arranged facing each other, the other belt-like thermal bonding portions adjacent to each other act to complement the contraction of the belt-like non-bonding portion. This prevents the occurrence of pinholes in the non-adhered portion.

Further, according to the configuration of Example 3, the excess air in the bag, by squeezing the bag from outside, outer bag reaches the opening 6 of the non-adhesive portion 14e which is formed in a stepped shape in a zigzag state To be discharged. Further, although the non-adhesive portion 14e is not thermally bonded, the films of the relevant portions are in close contact with each other, and the adhesive portion 7e is formed in a facing state below the non-adhesive portion 14e. Is prevented from entering the bag from the outside.
In the third embodiment, the strips having the adhesive portions 7e and the non-adhesive portions 14e alternately formed in three rows are not limited to this, and can effectively prevent the entry of dust from the outside. And from the viewpoint of facilitating the discharge of excess air in the bag, it is preferably formed in 2 to 4 rows.

Having described Examples 1 to 3 of the present invention, specific configurations are not limited to, changes without departing from the scope of the present invention is to be understood that it is possible appropriately .

The multilayer paper bag of the present invention is easy to fill the contents, and unnecessary air in the bag can be easily discharged, but it can prevent intrusion of dust from the outside, easy production management, and after use When the paper and the film can be easily separated and required to be easily recycled, the applicability becomes extremely high.

It is a side view which shows an example of the adhesion part of the multilayer paper bag of this invention. It is sectional drawing of the multilayer paper bag. It is an expanded sectional view in A of FIG. It is a perspective view which shows the layer structure of the same multilayer paper bag. It is process drawing which shows the manufacture condition of the multilayer paper bag. It is a side view which shows the other form of the adhesion part of the multilayer paper bag of this invention. It is a side view of the heater bar of the heat sealer when processing the same multilayer paper bag. It is a side view which shows the other form of the adhesion part of the multilayer paper bag of this invention. It is a side view of the multilayer paper bag which shows the structure of the adhesion part of Example 2 of this invention. It is a side view of the multilayer paper bag which shows the structure of the adhesion part of Example 3 of this invention. It is a side view which shows an example of the conventional multilayer bag. It is a side view which shows an example of the conventional multilayer bag. <Explanation of symbols>

Explanation of symbols

1, 1a, 1b, 1c, 1d Multi-layer paper bag 2, 3, a Paper 4 Thermal adhesive plastic film 5, c Tubular 6, 8, d, f Opening 7, 7a, 7e Thermal adhesive 7b, 7d Width Direction heat bonding part 7c Inner bag inner end 9, g bottom part 10 paper tape 11, e inlet 12 softening part 13 gear 13a convex part 14,14a, 14b, 14c non-adhesive part 15 heat seal bar 15a contact part b plastic the film

Claims (5)

It is composed of a multilayer tubular product having a heat-adhesive plastic film interposed between papers, and one of the openings of the multilayer tubular product is interposed between the paper and the paper. and the thermally adhesive portion and a non-adhesive portion by thermo-adhesive plastic film, provided alternately in the width direction relative to the opening, be those made as bottom and closing the other opening of said multilayer tubular product The heat-bonding part and the non-bonding part are in a state in which the heat-adhesive plastic film is softened by the heat sealer applied from the outside of the opening, and the gear having a convex part interrupted on the outer peripheral surface is pressed on the part. A multi-layer paper bag formed by running in It is composed of a multilayer tubular product having a heat-adhesive plastic film interposed between papers, and one of the openings of the multilayer tubular product is interposed between the paper and the paper. Thermally bonded portions and non-bonded portions made of a heat-adhesive plastic film are alternately provided in the width direction and the axial direction with respect to the opening portion, and the other opening portion of the multilayer cylindrical body is closed to become a bottom portion. The heat bonding part and the non-bonding part are formed by pressing with a heat sealer having a heat seal bar with the end face intermittently cut out inward from the outside of the opening. A featured multi-layer paper bag. In Claim 2, the said heat bonding part and a non-bonding part have the convex part which interrupted the outer peripheral surface in the said part in the state which pressed with the heat sealer which has the said heat seal bar, and the heat-adhesive plastic film softened. A multilayer paper bag formed by running a gear in a pressed state .   The thermal bonding portion and the non-bonding portion are formed in a plurality of strips in parallel with the opening, and the non-bonding portion formed between the thermal bonding portion and the thermal bonding portion is an inner end of the bonding portion. The multilayer paper bag according to claim 1, wherein a line connecting the bases is formed in a plurality of triangular shapes having a bottom side and tapering toward the opening. The thermal bonding portion is formed of a plurality of strips alternately having non-bonding portions formed in parallel with the opening and wider than the thermal bonding portions, and each of the band-shaped thermal bonding portions and the non-bonding portions. The multilayer paper bag of Claim 1 or 2 arrange | positioned in the mutually facing state.

Images