JP2019085166A - Easily-openable multilayer paper bag - Google Patents

Abstract

To provide an easily-openable bag that can be reduced in cost because of a simple structure and that can be opened easily and completely without being accompanied by generation of fine powder at the time of opening and fully satisfied with the complete prevention of powder leakage and the required strength.SOLUTION: One of upper paper 2a and lower paper 2b of a paper-like cylinder 2 is developed along a fold line 4 to form a developed surface 8 having triangular folds 5 and 6 and an opening 7 at both sides and at the center thereof, the upper paper 2a and the lower paper 2b are with creases 9a and 9b which sufficiently close the opening 7, and the lower paper 2b is folded along the crease 9b to the opening 7 side and the triangular folds 5 and 6 on both sides are pasted together, and a bent piece 10 having a predetermined width w is formed on an edge of the upper paper 2a, the upper paper 2a is folded along the crease 9a to the opening 7 side, and the bent piece 10 is stuck on the lower paper 2b in a non-sticking state to close the opening 7, an outer patch in which perforations are formed on the upper paper 2a and the lower paper 2b is pasted together.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for opening fine particles in a multi-layered paper bag for storing powdery particles derived from foods such as rice, wheat, corn starch and starch, feed, plastic resin, cement, lime, carbon black and the like. The present invention provides a configuration that suppresses the occurrence and uses less material to improve the openability, and more specifically, the opener tape conventionally used for opening a multilayer paper bag and the outer patch used therewith. The present invention relates to an easy-to-open multilayer paper bag which can be reduced in cost with a simple structure without using it, and there is no risk of contamination with the product caused by the generation of fines when it is opened when using a conventional opener tape.

  Conventionally, various proposals have been made regarding the idea of facilitating the openability of the paper bag filled with the powder and granular material described above, but the common thing is that the paper bag is externally attached to the open part when opening the paper bag. It is using the opening tape which stuck the elongate plastic tape in the arbitrary places of the outer patch.

  For example, in Japanese Patent Application Laid-Open No. 2004-307008 (Patent Document 1) according to the application of the present applicant, a triangular folding portion is formed in both corners of one open end of a paper cylinder which has been flatly folded and its state Open one of the upper sheet and the lower sheet formed by folding the paper tube with each other to form a spread surface, crease the upper sheet and the lower sheet to cover the central opening of the spread, and Cover the central opening and cross the creases outward, and bond the inner patch with tear-off piece to the developed surface with a peelable adhesive to make an opening side opening, The upper paper and the lower paper are folded and bonded along the above folds, the outer patch (force paper) with the opening tape is pasted on it, this opening tape is torn and the paper bag is opened easily. A bag is disclosed.

  However, this easy-to-open bag is cut with an opening tape integrated in a line at the center of the outer patch, the upper and lower sheets are peeled off to expose the inner patch, and the inner patch is peeled off. Not only a plurality of operations of peeling off with a piece is required, but there is also a complication that it is necessary to separately provide an inner patch in order to ensure sealing performance.

  Further, in JP-A-9-142490 (Patent Document 2), at least one end of a paper tube is opened about a first fold line parallel to the end edges, and a triangular folded portion is formed on both sides. A second fold line parallel to the first fold line is formed at symmetrical positions on both sides of the first fold line, the outer portion of the second fold line is bent inward, and the fold section is folded. In the bottom structure of the hexagonal bottom bag in which the bent portions are releasably attached to each other when forming the bottom portion by stacking and sticking, in the bottom structure of the hexagonal bottom bag, a long side straddles both triangular folded portions at the center of the opening portion. A bottom structure of a hexagonal bottom bag is disclosed, in which an inner bottom sheet of a size whose short side exceeds both second fold lines is linearly bonded along the outside of one of the second fold lines.

  However, even in the invention described in Patent Document 2, in order to open the bag, it is necessary to tear the bottom lining paper (which is the same as the opening tape in Patent Document 1) to which the opening string is attached. The generation of fines in the

  As described above, the inventions disclosed in Patent Document 1 and Patent Document 2 both tear the outer patch attached with the opening tape by using the opening tape as the opening start portion in the opening action of the bag. An opening is to be formed, and at this time, there is a concern that fine fragments may be generated and this may be mixed with the contents filled in the bag.

  In the present invention, in order to avoid such a situation, a method is sought for facilitating the opening of the bag without using the opening tape in the prior art, and as a result, the outer patch attached with the opening tape is substituted. As a result of searching for a configuration in which the outer patch itself is torn at the time of opening without using the opening tape in order to avoid the generation of fine powder caused by tearing the opening tape, the outer patch is replaced by the opening patch. In this case, it was confirmed that smooth opening operation of the bag could be performed without generation of fine powder at the time of opening by using the one in which perforations were directly cut and formed, resulting in the present application.

  From this point of view, using the outer patch in which perforations are directly cut for opening, the prior art using this perforation for opening the paper bag was searched, as disclosed in Japanese Patent Application Laid-Open No. 2003-276740. 3) was retrieved as an approximation technology in terms of the opening technology using perforations.

  Patent Document 3 discloses a paper bag in which the side edges of a plurality of stacked base sheets are adhered to form a plurality of cylindrical bodies, and the openings at both ends of the cylindrical bodies are sealed. Forming perforations in circumferential directions along the sealing site on the base paper of the outermost layer of the cylindrical body and in the vicinity of the sealing site at both ends of the cylindrical body; The paper bag which sticks the cut tape which was made to straddle the perforation on the said both end side is described in these.

  However, this paper bag peels off the outermost layer of the body portion of the paper bag to which the outermost layer of the whole paper bag adheres while being transported from the manufacturer to the delivery destination to, for example, a food factory etc. to provide a clean product. It is not a means for forming an outer patch in which perforations are formed to form an opening for discharging the contents of a paper bag. Moreover, the outermost layer of the paper bag is the first to be separated and removed by using the perforation and the cut tape in combination, and the outermost layer can be removed only by the perforation, and the use purpose of the perforation is with the present invention. It is different.

JP 2004-307008 A Unexamined-Japanese-Patent No. 9-142490 JP 2003-276740 A

  As described above, the inventions disclosed in Patent Documents 1 to 3 all refer to the configuration of the opening for discharging the contents of the paper bag, but the configuration disclosed therein is simple. With such a configuration, the cost can be reduced, and there is no possibility of contamination with the product caused by the generation of fine powder brought about at the time of opening when using the conventional opening tape, and it is not possible to provide an easily openable multilayer paper bag.

  Therefore, while the object of the present invention is a simple structure that can be configured with a small number of parts, complete prevention of leakage of powder particles and necessary strength can be maintained, and generation of fine paper powder etc. upon opening can be achieved. It is an object of the present invention to provide a bag having an opening mechanism which can easily and completely open the bag simply by tearing the perforations inscribed in the outer patch without using the opening tape which may involve the

  The object of the present invention is, in general, used in the prior art to open a bag-like outer patch on a sheet-like outer patch by cutting both sides of the tip and sticking an elongated film with this part as an opening start part Instead of using the conventional opening tape, instead, cover the opening portion of the bag with a perforated outer patch (force paper), and with the open end folded, the open end of the bag Combined with the upper paper formed in the above to achieve the purpose of the present invention, such as complete prevention of leakage of powder particles and maintenance of required strength, and fine paper dust etc. upon opening. The bag can be opened easily and completely simply by tearing out the perforations cut in the outer patch without using the opening tape which may be accompanied by the occurrence, and the material cost can be suppressed. Providing a bag having an opening mechanism It can be.

The present invention has been proposed to achieve the above object, and is characterized by comprising the following constitution.
That is, according to the present invention, a crease parallel to the open end is formed at a position inwardly away from the open end of one of the flat folded paper-like cylinders, and both corners of the open end are extended to the crease One side of the upper sheet or lower sheet formed in the folded state is developed along the fold line to form a spread surface having a triangular fold portion and an opening at both sides and in the center thereof, and the upper sheet of the spread surface And the lower sheet is folded to the side of the opening to seal the opening, and a crease parallel to the fold is provided, and the upper side of the upper paper has a predetermined width parallel to the crease. The folded sheet is folded to the opening side to form a folded piece, and the upper sheet in that state is folded along the fold line to the opening side, and the folded piece is stuck on the lower sheet in a non-sticking state Block the perforations, and make perforations around the entire surface of the upper and lower sheets. Easy open bag, characterized in that the adhesive coated outer patch (force feed) is provided.

  Further, according to the present invention, there is provided the easy-to-open bag in which the fold is made two-fold.

  Further, according to the present invention, there is provided the easily openable bag in which the perforations are formed in a straight line from one lateral end of the outer patch (web) to the other.

  Further, according to the present invention, there is provided the easy-to-open bag, wherein the perforations are formed in the shape of a hook in the center of an outer patch (web).

  Further, according to the present invention, there is provided the easy-to-open bag wherein the paper fibers of the outer patch (sticky paper) are aligned in the direction in which the perforations are drawn.

The action according to the present invention is as follows.
That is, the greatest feature of the present invention is to use perforations in the outer patch for closing the opening of the bag instead of using the opening tape conventionally used as a means for opening the paper bag, instead of using the opening tape. In addition, the structure of folding the tip of the upper paper formed in the opening can combine with the problem of using the opening tape, that is, the generation of fine dust caused when the opening tape is torn can be suppressed. Therefore, the present invention, which can prevent contamination of the product in advance and materialize the perforation of the outer patch itself rather than the opening tape in which the plastic tape for opening is attached to the outer patch, is a material cost. It also proves that it is economically superior in terms of

  In addition, although the folding of the upper sheet can achieve the purpose with a single folding, it may be folded twice in order to withstand strong vibration during transportation.

  The perforations in the present invention may be intermittently cut at any places of the outer patch, and the perforations may be opened by an external force whether the perforations penetrate the front or back of the outer patch or not. What is necessary is Further, the arrangement of perforations is at least one, and most preferably two. Moreover, when the arrangement of perforations is two or more, the distance between the rows is preferably 8 mm or more. When the distance between the rows is 8 mm or less, parallel perforations may interfere with each other due to an unexpected impact or the like, and there is a risk of breakage from the portion. In the present invention, it is generally used that the perforations are formed from the end of the outer patch in the tearing direction to the entire end.

 When it is desired to dispense the contents of the bag, the perforations may be formed only at the central portion of the outer patch, and one example is one formed like a hook.

Other than that, although various shapes can be applied depending on the contents of the bag, the shape of the perforation may be applied, but an example in which the perforations are formed in two rows is shown in FIG.
As can be understood from the example of FIG. 2, in the case where two rows of perforations are provided up to the end of the outer patch, it is preferable to form an incision for tearing start at the end of the perforation.

  In the example shown in FIG. 2e, a semi-perforated perforation that does not penetrate from the surface to the back surface of the outer patch is formed, and a perforation that does not penetrate to the surface is cut from the back surface of the outer patch.

  Although the paper strength of the outer patch used in the present invention can be used without particular limitation, although conventionally used for the opening tape having a certain basis weight, it is used as the most preferable outer patch in the present invention What is used is to use fiber in which the outer patch is made in the same direction as the perforations.

  In other words, the outer patch is obtained by paper-making a raw material containing fibers such as wrinkles and mitsumata, but in the paper-making process, paper in which the fiber is papered in a certain direction has fine powder when tearing perforations. As the occurrence is suppressed and the operation is smoothly performed, it can be mentioned as the most preferable.

  In order to make perforations in the outer patch, it is common to apply die casting technology. In this case, corresponding to the perforations provided on the surface of one of the calender rolls, the indented perforations are formed on the surface of the other calender roll, and the outer provided between the rolls The patches are perforated as the calendar rolls rotate.

  According to the easy-to-open bag of the present invention, although it has a simple structure, an outer patch in which perforations are engraved is used instead of the conventional open tape, and the tip of the upper paper forming the opening is folded. There is an effect that the opening can be performed easily and completely without the generation of fine powder at the time of opening and without the leakage of the contents while reducing the material cost.

  Moreover, according to the easy-to-open bag of the present invention, in addition to the above-mentioned effects, there is an effect to ensure complete prevention of the leakage of the powder substance which is the contents.

  Moreover, according to the easy-to-open bag of the present invention, in addition to the above effects, there is an effect that smoother unsealing operation of the bag can be achieved by using a specific outer patch.

It is a top view which shows the structure of the easy-to-open bag in embodiment of this invention shown in Example 1. FIG. It is a top view which shows an example of the perforation inscribed in the outer patch used by this invention. It is a top view of the completion figure which joined the outer patch in which the perforation of this invention was engraved provided to the opening of a bag.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  In the drawing, 1 is an easy-to-open bag, and this easy-to-open bag 1 has a fold 4 parallel to one open end 3A of the flat folded paper cylinder 2 from the open end 3a. Affix at a distant position, fold both corners of the open end 3a up to the crease 4 and expand one of the upper paper 2a and the lower paper 2b formed in that state along the crease 4 to form triangular creases on both sides and their central part 5 and 6 and an opening 7 are formed, and the upper paper 2a and the lower paper 2b of the expansion surface 8 are folded to the opening 7 side to sufficiently close the opening 7 and the fold 4 and Parallel creases 9a and 9b are attached, and the lower paper 2b is folded along the creases 9b to the opening 7 side, and the triangular folds 5 and 6 on both sides are pasted together.

  Next, the upper sheet 2a has a predetermined width w parallel to the creases 9a and is folded toward the opening 7 to form a bent piece 10, and the upper sheet 2a in that state is formed into the creases 9a. In the state where it is folded along the opening 7 side and the bending piece 10 is not attached, it is pasted on the lower paper 2 b to close the opening 7, and further, the central part of kraft paper on the entire upper surface The outer patch was covered with an outer patch in which two rows of perforations with 10 mm between the rows were engraved (see FIG. 3), and the peripheries thereof were joined and bonded. The outer patch 11 in which the perforations are formed is usually located outside the bent piece 10 of the upper sheet 2a.

In the present invention, the most important feature is to use a perforated outer patch in place of the conventionally used opening tape at the time of opening the bag having the above configuration.
In FIG. 3, the top view of the finished product which joined the outer patch which engraved the perforation of this invention was provided in the bag main body was shown.

As described above for the purpose and effect of using the outer patch having perforations in place of the conventionally used opening tape, the material is excellent in opening property without causing generation of fine powder at the time of opening, and less material The purpose is cost-effective and its usefulness is remarkable in practice.

  The paper cylinder 2 is selected to any diameter and length according to the purpose of use, and in this embodiment, two-layered ones are used, but the present invention is not limited to this and a multilayer of three or more layers is used. But it is good. The material of the paper cylinder 2 is not limited to kraft paper, and is not particularly limited as long as it imparts degassing properties and has a predetermined strength, and resin sheets, paper with resin sheets attached to paper, etc. are used Be done.

  And, in the case of discharging the granular material filled in the easy-to-open bag 1, if an external force is applied from above the perforated outer patch, the bent piece 10 of the upper sheet 2a is naked. Since the bent piece 10 portion is not bonded, the bent piece 10 portion can be easily pinched with a finger, and if the bonded portion is peeled off by peeling off the upper sheet 2a, the opening is obtained. 7 can be released and the contents can be taken out.

That is, according to the present invention, the easy-to-open bag 1 can be easily opened without using other devices, and the powder and granular material can be taken out and used.

  In addition, when the outer patch used in the above Example 1 was made by forming the fibrous material in the same direction as the perforation, there was no generation of fine powder at the time of opening, and The tearing operation was performed extremely smoothly.

  Although the first embodiment of the present invention has been described above, it is to be understood that the specific configuration is not limited to this, and modifications can be made as appropriate without departing from the scope of the present invention.

  The easy-to-open bag of the present invention can reduce the cost due to its simple structure, and completely prevent the leakage of the powder and granular material which is the contents, without the generation of fine powder at the time of opening. When fully satisfied with the required strength and it is desired that the opening be done easily and completely, the availability is extremely high.

1 easy-to-open bag 2 paper cylinder 2a upper sheet 2b lower sheet 3A one open end 3a open end 4 fold 5, 6 triangular fold 7 open 8 spread surface 9a, 9b crease 10 fold piece 11 perforation Example of perforations engraved on the outer patch 12

Claims (5)

  A crease parallel to the open end is formed at a position inwardly away from the open end of one of the flat folded paper-like cylinders, and both corners of the open end are folded up to the fold and formed in that state One side of the paper or base paper is developed along the folds to form a spread surface having triangular folds and openings at both sides and at the center thereof, and the upper and lower papers of the spread surface are made of the above It folds to the opening side to seal the opening, and makes a crease parallel to the fold, and folds the end side of the upper sheet to the opening with a predetermined width parallel to the crease and folds it A bent piece is formed, the upper sheet in that state is folded along the folds to the opening side, the bent piece is stuck on the lower sheet in a non-sticking state, and the opening is closed. With outer patch (weft paper) which perforated the circumference of the whole surface of paper and lower paper Easy open bag, characterized in that the wear coating.   The easy-to-open bag of claim 1, wherein the fold is doubled.   The easy-to-open bag according to claim 1 or 2, wherein the perforations are formed in a straight line from one lateral end of the outer patch (web) to the other.   The easy-to-open bag according to any one of claims 1 to 3, wherein the perforations are formed in the shape of a hook in the center of the outer patch (web). 5. The easy-to-open bag according to any one of claims 1 to 4, wherein the paper fibers of the outer patch (sticky paper) are aligned in the direction of drawing perforations.

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