JP2017206279A - Packaging bag and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging bag capable of being efficiently manufactured by a simple work, as well as being easily cut from any position by a user.SOLUTION: A packaging bag 10 comprises: a bag body 12 made of a folded material containing an olefin as a main component, processed to form a cylindrical shape. Processing 14 to form cut areas 14a for allowing one of fold-like end parts 12a of the bag body 12 to be cut to start opening at the end part 12a across the bag body 12, is implemented continuously and periodically in the end part. At least a part of each cut area 14a is formed astride or facing an outer edge of the bag body 12, to provide an incision in the outer edge of the bag body 12.SELECTED DRAWING: Figure 1

Description

  The present invention includes, for example, chemical raw materials such as polyethylene granules and chemical raw materials such as food additives, civil engineering and horticultural products such as fertilizer, culture soil, and gravel, food products such as salt, sugar, and rice mills, and pharmaceuticals. The present invention relates to the improvement of packaging bags used for storage and transportation of various products and the manufacturing method thereof, and more particularly to the improvement of handling that can be efficiently manufactured and can be easily opened. .

  For example, when shipping chemical raw materials, civil engineering horticultural products such as fertilizers, foodstuffs, pharmaceuticals, etc. from factories, etc., they are packed in large quantities and used for transportation, etc. Comparison of about 600 mm in width and about 800 mm to 1000 mm in height A large plastic packaging bag is manufactured by processing a plastic film obtained by inflation molding or laminating into a cylindrical shape and sealing its upper end (top) and lower end (bottom).

  In this case, by using a cyclic olefin resin such as a cyclic olefin polymer (Cyclo-Olefin Polymer: COP) or a cyclic olefin copolymer (Cyclo-Olefin Copolymer: COC) as this plastic film, a simple cut property can be obtained. (For example, refer to Patent Document 1). These cyclic olefin-based resin films are excellent both in the MD direction (Machine Direction (machine direction): the flow direction of the resin) and the TD direction (Transverse Direction (transverse direction): the width direction of the resin). Since it has a straight cutting ability and can be torn even with a small force, it has been developed for uses such as the manufacture of packaging bags that require simple opening.

  However, in order to express the simple cut property of this cyclic olefin resin, it is necessary to cut the film, and it is difficult to cut from other than the cut formed by the cut process. Is true. That is, in order to express simple cutting properties, it is necessary to have a cut as a starting point for applying a shearing force. In general, as a cut processing for forming this cut, a V-shaped part is formed on a part of the film. Notch processing for providing a notch (for example, see Patent Document 2), half-cut processing (for example, see Patent Document 3) for cutting into the middle of the film thickness direction using a laser marker, and the like have been performed. .

  However, with regard to notch processing, when a cylindrical plastic film is cut into a bag shape every predetermined length, the plastic film is processed into a bag shape so that a notch is formed at the same position for each bag. At this stage, it is necessary to adjust the notch to be formed at a fixed position, and it is also necessary to relatively change the position of the notch according to the height of the bag. There was a problem that processing took much labor and time. In this case, regardless of the height of the packaging bag as the final product, a notch is formed at a certain position and cut into the required length at the cutting stage of the cylindrical plastic film. In the packaging bag, it is conceivable to provide a notch at the same position, but the plastic film is wasted accordingly, which is not preferable in terms of cost and environment.

  In addition, since the packaging bag as a finished product can only be opened from this notch portion, particularly when the notch is attached to an inconspicuous place, the user is forced to find the position of the notch. In addition, even if there is a surplus part that is not in contact with the contents due to a decrease due to the use of the contents of the packaging bag, it is necessary to fold, tie, or squeeze the surplus part. The portion sometimes hindered the contents removal work.

  On the other hand, in the half-cut processing, in addition to the same problem as described above, it is costly to use a laser for the processing, and it is difficult to perform an adjustment operation for cutting at an appropriate depth. Depending on the thickness of the film, the appropriate cut depth also changes, and there is a problem that further adjustment is accompanied by the adjustment.

  Furthermore, when the bag body is formed by stacking a plurality of plastic films and sealing the end portions, the front and back sides of the bag rear end portion are subjected to the cutting process. The film is not displaced and a cut is not formed at a position outside the predetermined range, but when the cylindrical plastic film is simply folded and the cut is performed in a state where the end is not sealed, Depending on the method of processing, there is a possibility that the position of the cut edge is displaced.

  In addition, the conventional cut end is formed on the center side of the packaging bag from the top seal part or the bottom seal part, that is, on the side filled with the contents. There was a risk of the contents leaking from the cut end. Further, since the contents are exposed to the outside air through the cut end, there is a possibility that the contents are deteriorated or deteriorated due to oxidation or moisture absorption.

Japanese Patent Laid-Open No. 2015-123642 JP 2007-55234 A JP 2006-31495 A

  In view of the above problems, the problem to be solved by the present invention is that the bag body can be easily cut from an arbitrary place by the user while being efficiently manufactured with simple operations. An object of the present invention is to provide a packaging bag capable of preventing leakage and alteration of contents while exhibiting simple cutting properties, and a method for producing such a packaging bag.

(1. Packaging bag)
The present invention, as a first means for solving the above problems, is a packaging bag having a bag body formed by folding a raw material made of a raw material mainly composed of olefin and processed into a cylindrical shape. A packaging bag characterized in that a process for forming a cut opening for opening the crease-shaped end portion of the bag body so as to cross the bag body from the end portion is continuously or periodically performed on the end portion. Is to provide.

  In addition, as a second means for solving the above-described problem, the present invention provides a process for forming a cut in the fold-like end portion of the bag body in the first solution means. The present invention provides a packaging bag characterized by being applied over the entire area.

  According to the present invention, as a third means for solving the above-described problem, in the first or second solving means, a plurality of cut edges are periodically or continuously formed in the fold-shaped end portion. The present invention provides a packaging bag that is formed.

  According to the present invention, as a fourth means for solving the above-described problem, in any one of the first to third solving means, at least a part of the cut end extends over the outer edge of the bag body or on the outer edge. A packaging bag is provided which is formed so as to face and has a cut in the outer edge of the bag body.

  The present invention provides, as a fifth means for solving the above-mentioned problems, in any one of the first to fourth solving means, wherein the cut surface has a hole shape, a linear shape, or a concave shape. A packaging bag is provided.

  According to the present invention, as a sixth means for solving the above-described problem, in any one of the first to fifth solving means, the end portion of the bag body has a seal portion formed along the end portion. In addition, the present invention provides a packaging bag characterized in that the cut end is formed in the seal portion.

  The present invention provides, as a seventh means for solving the above-mentioned problems, in any one of the first to sixth solving means, wherein the main raw material olefin is a cyclic olefin such as a cyclic olefin polymer or a cyclic olefin copolymer. The present invention provides a bag for packaging pouches, characterized in that it is a resin.

  The present invention provides, as an eighth means for solving the above problems, in any one of the first to seventh solving means, wherein the bag body has a thickness of 50 μm to 300 μm. Provide a bag.

  According to the present invention, as a ninth means for solving the above problem, in any one of the first to eighth solving means, the bag body has a top seal portion or a bottom seal portion, and these top seals Provided is a packaging bag characterized in that a notch is formed which starts from the upper end side or the lower end side of the part or bottom seal part and does not extend to the center side of these top seal part or bottom seal part. Is.

  According to the present invention, as a tenth means for solving the above problem, in the ninth solving means, the notch is parallel to the fold-like end portion of the bag body or to the fold-like end portion of the bag body. The present invention provides a packaging bag characterized by being inclined obliquely.

  According to the present invention, as an eleventh means for solving the above problems, in any one of the first to eighth solving means, the bag body has a top seal portion or a bottom seal portion, and these top seals The present invention provides a packaging bag having a notch formed on the center side of the part or the bottom seal part and sealed around the notch.

(2. Manufacturing method of packaging bags)
The present invention also provides the following method for manufacturing a packaging bag used for manufacturing a packaging bag, which is the first to eleventh solving means. That is, the present invention is a twelfth means for solving the above-described problem, which is a method for manufacturing a packaging bag having a bag body made of a raw material mainly composed of olefin, wherein the bag body is formed from the raw material. Later, before or after winding the bag body, the bag body is fed out, and while applying tension to the bag body, the fold-like end of the bag body is a processing roll having a blade and a soft roll capable of receiving the blade. It is characterized in that the end portion is continuously or periodically subjected to a process of forming a cut opening for passing through the fold-like end portion of the bag body so as to cross the bag body from the end portion. A method for manufacturing a packaging bag is provided.

  As a thirteenth means for solving the above-mentioned problems, the present invention provides a packaging bag characterized in that in the twelfth solution means, a bag body is formed by forming a raw material into a cylindrical shape and folding it. A manufacturing method is provided.

  According to the present invention, as a fourteenth means for solving the above-described problem, in any one of the twelfth and thirteenth solving means, a process of forming a cut end in a fold-like end portion of the bag body is performed at the end portion. The present invention provides a method for producing a packaging bag characterized by being applied over the entire length.

  According to the present invention, as a fifteenth means for solving the above-described problem, in any one of the twelfth to fourteenth solving means, a plurality of cut edges are periodically or continuously formed in a fold-like end portion. The manufacturing method of the packaging bag characterized by forming is provided.

  According to the present invention, as a sixteenth means for solving the above-described problem, in the twelfth to fifteenth solving means, at least a part of the cut surface extends over the outer edge of the bag body or faces the outer edge. The present invention provides a method for manufacturing a packaging bag, characterized by forming a cut in the outer edge of the bag body.

  The present invention provides, as a seventeenth means for solving the above-mentioned problems, in any one of the twelfth to sixteenth solving means, wherein the cut surface is formed in a hole shape, a linear shape, or a concave shape. A method for producing a packaging bag is provided.

  According to the present invention, as described above, the process of forming the cut opening for opening the fold-like end portion of the bag body so as to cross the bag body from the end portion is continuously or periodically performed on the end portion. Therefore, it is not necessary to adjust the position of the cut when cutting a continuous cylindrical plastic film into a bag shape every predetermined length. There is a real advantage that the processing can be performed efficiently without the need for a process.

  Further, in this case, according to the present invention, as described above, since the process of forming the cut end in the fold-shaped end portion of the bag body is performed over the entire length of the fold-shaped end portion, Can be opened from any part of the end of the bag (side of the bag body), and the user no longer needs to look for a cut. If there is a surplus part that is not in contact with it, the surplus part can be cut out to the required height without folding, tying, or squeezing out the surplus part. There is an advantage that the removal work can be performed smoothly without hindering the work. In this case, “processing is performed over the entire length” means that the processing is performed over the entire length, and it is not necessary that the cut surface itself exists continuously over the entire length.

  According to the present invention, as described above, the cut processing is performed continuously or periodically by forming a plurality of cuts periodically or continuously at the crease-shaped end. Therefore, there is an advantage that the user can easily open the bag body from an arbitrary position on the fold-like end portion (side portion of the bag body).

  According to the present invention, as described above, if the cutting process is performed continuously or periodically, at least a part of the plurality of cuts is, for example, a linear cut, a bag. Since it is formed across the outer edge of the main body or facing the outer edge of the bag main body if it is a hole or concave cut, the end of the bag main body is provided with a cut at the outer edge of the bag main body. There is an actual benefit that the user can surely apply a shearing force to the bag body from this cut, and the bag body can be opened easily and reliably. is there. In this case, as described above, there is an advantage that the cut can be a cut having an appropriate shape according to the manufacturing situation, such as a hole shape, a linear shape, or a concave shape.

  According to the present invention, as described above, the end portion of the bag body has the seal portion formed along the end portion, and the cut end is formed in the seal portion. There is a profit that can be easily cut while maintaining

  Furthermore, according to the present invention, as described above, since the olefin as the main raw material is a cyclic olefin-based resin such as a cyclic olefin polymer or a cyclic olefin copolymer, an opportunity for cutting (opening) is given by the cut end. Therefore, there is an actual advantage that simple cut property can be expressed.

  In addition, according to the present invention, as described above, when performing the cut processing, the fold-like end of the bag body can receive the processing roll and the blade having the blade while applying tension to the bag body. Because it is passed between the soft rolls that can be made, especially when the bag body is made without sealing the crease-shaped end of the cylindrical plastic film, the plastic on the front and back slides against each other and shifts in position. In this way, it is possible to prevent the cut from being formed at a position other than the predetermined position, and to appropriately cut the cut even if the bag body is formed by forming the raw material into a cylindrical shape in this way. Therefore, compared to the case where a bag body is formed by stacking a plurality of plastic films and then sealing the end portion, the process of overlapping and sealing the film is omitted to form the bag body. It can efficiently have practical benefits that can form a bag body.

  Further, according to the present invention, as described above, in the bag body having the top seal portion or the bottom seal portion, starting from the upper end side or the lower end side of these top seal portion or bottom seal portion, these top seals Or a notch that does not extend to the center side of the bottom seal part or a notch formed at the center side of these top seal part or bottom seal part, and the periphery of this notch Since it is sealed, this notch gives the opportunity for opening and expresses the simple cut property of the bag body, while the contents do not reach these notches, so the particle size of the contents Even in small cases, the contents can be prevented from leaking to the outside, and at the same time the contents touch the outside air and change or deteriorate due to oxidation, moisture absorption, etc. There are practical benefits can be prevented.

It is a schematic front view of the packaging bag of this invention. It is an enlarged view of the edge part given the cut end of the packaging bag of this invention. It is a schematic side view of the state which manufactures the packaging bag of this invention. It is a schematic front view of other embodiment of the packaging bag of this invention. It is a schematic front view of other embodiment of the packaging bag of this invention.

  FIG. 1 shows a packaging bag 10 according to the present invention. The packaging bag 10 is made of, for example, raw materials or foods for chemical products such as polyethylene grains. Packing and transporting large quantities of chemical raw materials such as additives, civil engineering horticulture such as fertilizer, culture soil, and gravel, food products such as salt, sugar, and rice mills, and various products such as pharmaceuticals It is a relatively large bag having a width of about 600 mm and a height of about 800 mm to 1000 mm. The packaging bag 10 has a bag body 12 as shown in FIG. 1, and the bag body 12 is formed with a cut end 14a at a fold-like end portion 12a as shown in FIGS. Processing 14 is performed.

(1. Bag body)
The bag body 12 is made of a raw material containing olefin as a main raw material. As shown in FIG. 3, the raw material is processed into a cylindrical shape mainly by inflation molding, and then folded, and the fold-shaped end portions 12a (both side ends) It is manufactured by cutting into a required length after forming the original bag body 12 and then top sealing or bottom sealing the upper and lower ends.

  As the olefin as the main raw material, a cyclic olefin-based resin can be used. Specifically, a cyclic olefin polymer (Cyclo-Olefin Polymer: COP) or a cyclic olefin copolymer (Cyclo-Olefin Copolymer: COC) can be mentioned. be able to. These cyclic olefin resins are excellent in both MD direction (Machine Direction (machine direction): resin flow direction) and TD direction (Transverse Direction: resin width direction). This is because it has a cut property and is provided with an opportunity for cutting (opening) by the cut edge, so that it can be torn even with a small force and a simple cut property can be expressed in the packaging bag 10.

  In this case, these cyclic olefin-based resins can be used alone to form a single-layer inflation tube film, but if necessary, a multilayer bag can be formed by combining with other resins such as polyethylene by multilayer inflation molding. It can also be the main body 12. Specifically, the polyethylene has a melt flow rate (hereinafter simply referred to as MFR) according to JIS K7210 of 0.03 g / 10 min to 4.0 g / 10 min, and C (carbon number) 4 to C8. And linear low density polyethylene (LLDPE) having the following side chains. Such linear low density polyethylene (LLDPE) is produced by adding α-olefin having 4 to 8 carbon atoms such as butene-1, hexene-1, 4 methylpentene-1, octene-1 at the time of production. can do. Using this linear low density polyethylene (LLDPE), for example, the intermediate layer has a layer blended with a cyclic olefin resin and linear low density polyethylene (LLDPE), and the outermost layer and innermost layer on both sides thereof. Furthermore, it can be set as the multilayer bag main body 12 which has a linear low density polyethylene (LLDPE).

  In addition, when using together with polyethylene, such as linear low density polyethylene (LLDPE), it is desirable to use a cyclic olefin copolymer (COC) among cyclic olefin resins. This is because the cyclic olefin copolymer (COC) has better compatibility and higher processability when mixed with polyethylene than the cyclic olefin polymer (COP). On the other hand, when the cyclic olefin copolymer (COC) is used, the cost also increases. Therefore, a relatively flexible cyclic olefin polymer (COP) can be used alone as required for the purpose of the packaging bag 10 or the like.

  In addition, for the purpose of modifying the packaging bag 10, additives such as a weathering agent, a flame retardant, an antioxidant, an antistatic agent, and a slip agent are packaged on the raw material of the bag body 12 as necessary. It can add in the range which does not affect the property as the bag 10.

  As shown in FIG. 3, the raw material prepared as described above is put into a heated cylinder from the hopper of the inflation molding machine 1, and sent by a screw while being kneaded in a completely melted state. After being pushed out into a cylindrical shape from the lip portion while blowing air, the polyethylene is cooled by an air ring and pulled up by a pinch roll 2 to crush the cylinder that is the original shape of the bag body 12 It is continuously formed into an original fabric (tubular film). The blow ratio, which is the degree of expansion due to air blowing at this time, is an important factor affecting the orientation balance of the cylindrical film, and thus the strength, transparency, and film formation stability. It is preferable to set to 0.0 to 3.0.

  In this case, the cylindrical film which is the original shape of the bag body 12 is formed by adjusting the width to 400 mm to 600 mm according to the use and necessity. The bag body 12 is manufactured by cutting the cylindrical film formed in this predetermined width into a length of 800 mm to 1000 mm according to the use and necessity as shown in FIGS. 1 and 2. .

  In addition, in the present invention, the bag body 12 is formed to a thickness of 50 μm to 300 μm. In this case, the upper limit of 300 μm is provided because if the thickness exceeds 300 μm, the packaging bag 10 lacks flexibility and adversely affects the operation for folding and packaging. Therefore, by setting the thickness to 300 μm or less, there is no rigidity more than necessary, and good handleability can be exhibited even during folding. However, on the other hand, in particular, in order to form a thickness exceeding 150 μm, it is necessary to appropriately adjust the settings of the inflation molding machine 1 including the blow ratio. In addition, when the packaging bag 10 of the present invention is used as a single body, the thickness is about 100 μm to 150 μm, while ensuring strength, for example, as an inner bag such as a craft bag made of kraft paper. When it does, it can be set as the thickness of 70 micrometers-80 micrometers.

  In addition, as a method of shape | molding a raw material into the cylindrical film which is the original form of the bag main body 12, it is not necessarily limited to said inflation molding, If it can be set as the bag main body 12 which satisfies said conditions. In addition, for example, a tube is formed by laminating by first forming a film by a T-die molding method, a calendar molding method or a stretching method, and then heat-sealing the both ends in the length direction or width direction of the film. It can also be made into a film.

  Further, the end portion 12a of the bag body 12 is formed with a seal portion along the end portion (continuously in the form of a belt at the left and right ends of the bag body 12) depending on the contents, particularly when airtightness is required. The cut portion 14a described later can be formed in the seal portion. On the other hand, when high airtightness is not required or when air permeability is required, the cut portion 14a described later is formed without forming the seal portion. It can also be formed.

(2. Cutting process)
In the present invention, as shown in FIGS. 1 and 2, the cut 14a formed in the fold-like end 12a of the bag body 12 has a cut for opening across the bag body 12 from the end 12a. It is. That is, the cut opening 14a in the present invention is not for opening from the upper end or the lower end of the cut surface of the bag body 12 cut to a necessary length toward the other end, and is formed in a cylindrical shape from the beginning. This is a cut opening 14 a for opening the packaging bag 10 from the side surface portion formed by the fold-like end portion 12 a of the bag body 12. Accordingly, the cut 14a is a part of the bag body 12 that is originally continuous in a cylindrical shape, and becomes a cut 14a for opening from a location that is difficult to open unless the processing 14 is performed. .

  In the present invention, as shown in FIGS. 1 to 3, the process 14 for forming the cut 14a is continuously or periodically applied to the fold-shaped end portion 12a. Here, continuously, as shown in FIG. 1, it is sufficient that the processing 14 process itself is continuously performed, and the cut surface 14 a itself does not need to be continuous. Further, periodically means that there may be a part that is not processed in a small part, and basically, a part that is processed 14 is more than the other part. It is desirable that the portion where the processing 14 is markedly occupies almost the entire area of the fold-shaped end portion 12a. Thereby, when cut | disconnecting a continuous cylindrical plastic film for every predetermined length and making it into a bag shape, the cut end 14a is formed in the same location between the packaging bags 10 as several identical products. Since it is not necessary to adjust the position of the cut end 14a, the cut end processing 14 can be processed efficiently without requiring labor, time, and wasteful resources.

  Therefore, more desirably, the processing 14 for forming the cut 14 in the fold-shaped end portion 12a of the bag body 12 is preferably performed over the entire length of the fold-shaped end portion 12 as shown in FIG. Thereby, it can open from any location of the crease-like edge part 12a (side part of the bag main body 12) of the bag main body 12, and it becomes unnecessary for a user to look for the cut end 14a, and the packaging bag 10 If there is a surplus part that is not in contact with the contents due to a decrease due to the use of the contents, cut off the surplus part without folding, tying, or squeezing the surplus part. Thus, the removal operation can be performed smoothly without the surplus portion hindering the content extraction operation. In this case, “the processing is performed over the entire length” means that the processing 14 is performed over the entire length, and it is not always necessary that the cut 14a itself is continuously provided over the entire length. Absent.

(2-1. Cut end)
For example, as shown in FIG. 2A, the cut opening 14a may have a linear shape in which a plurality of fold-shaped end portions 12a are formed in an arc shape over multiple rows and stages. In the case of the cut opening 14a as such a simple cut, the shape is not particularly limited, and the shape is not limited to the illustrated arc shape, and may be any shape such as a straight line or a wavy line.

  In addition, as shown in FIG. 2 (B), for example, the cut surface 14a may have a hole-like shape formed in a plurality of circles in multiple rows and stages at the fold-like end portion 12a. In this case, the shape of the hole is not particularly limited, and may be an arbitrary shape such as a triangle, a square, an ellipse, or a rhombus in addition to the illustrated circle.

  Further, as shown in FIGS. 2 (C) and 2 (D), for example, the cut surface 14a has a laterally-shaped "V" -shaped concave shape (i.e., a <shape) formed so as to face the fold-shaped end portion 12a. Or> shape). In this case, the “concave shape” means a notch formed toward the inside of the bag body 12 when viewed from the fold-shaped end portion 12a, and as shown in FIG. The cutouts can be arranged with a predetermined interval, or a plurality of cutouts can be continuously formed without a gap as shown in FIG. However, the latter case can be applied only when the above-described seal portion is formed on the creased end portion 12a. The concave shape is not particularly limited, and may be an arbitrary shape such as a U shape in addition to the illustrated V shape.

  In this case, as shown in FIGS. 2 (A) to 2 (C), a plurality of cuts 14a can be formed periodically. In particular, in the case of the concave cut 14a, as described above, FIG. As shown in (D), a plurality of cut edges 14a can be arranged continuously. For this reason, a user can open easily from the arbitrary positions of the crease-like end part 12a (side part of the bag main body 12) of the bag main body 12.

  However, in any of these forms of cuts 14a, as shown in FIGS. 2A and 2B, at least some of the cuts 14a are formed in the linear or hole cuts 14a. 14a straddles the outer edge of the bag body 12, and the concave cut 14a is formed facing the outer edge of the bag body 12, as shown in FIGS. In any case, it is necessary that the outer edge of the bag body 12 is provided with a cut. This is because, as described above, even when a cyclic olefin polymer (COP) or a cyclic olefin copolymer (COC) is used, in order to express its simple cut property, a break that becomes the trigger for opening is necessary. . As a result, as shown in FIG. 2 in particular, the end 12a of the bag main body 12 always has a cut that triggers opening, and the user reliably applies a shearing force to the bag main body 12 from this cut. The bag body 12 can be opened easily and reliably.

(2-2. Processing method)
As shown in FIG. 3, the cut end 14a passes through the crease-shaped end portion 12a of the bag body 12 between the processing roll 3 having the blade 3a and the soft roll 4 that can receive the blade 3a. Can be formed. The shape, position, number and the width of the cut 14a are determined by the shape, position, number and width of the blade 3a of the processing roll 3.

  In this case, it is desirable to pass between the processing roll 3 and the soft roll 4 while applying tension to the bag body 12 as shown in FIG. Thereby, especially when making the bag main body 12 without sealing the crease-shaped end portion 12a of the cylindrical plastic film, the plastics on the front and back slide with each other to cause positional displacement, and the position is outside a predetermined position. Since it is possible to prevent the cut 14a from being formed, and even if the bag body 12 is formed by forming the raw material into a cylindrical shape and folding it, the cut processing 14 can be appropriately performed. Compared with the case of forming the bag body 12 by stacking the plastic film and then sealing the end, the bag body 12 can be formed by omitting the steps of film stacking and sealing. The bag body 12 can be formed.

  In addition, as shown in FIG. 3, the step of performing the cut processing 14 may be performed by passing between the processing roll 3 and the soft roll 4 as it is after winding the bag body 12 and before winding. it can. In this case, unlike the illustrated embodiment, the processing roll 3 and the soft roll 4 can be used instead of the pinch roll 2. In addition, after the bag body 12 is wound up, the cut end processing 14 can be performed when the bag body 12 is sent to another process. In the illustrated embodiment, as shown in FIG. 33, both the crease-shaped end portions 12a are processed 14; however, it is also possible to process only one of the end portions 12a. include.

(3. Notch)
Moreover, in this invention, as shown in FIG.4 and FIG.5, the notch 16 can also be formed as a means for assisting opening apart from the cut process 14 mentioned above. Specifically, first, as shown in FIG. 4, a notch 16 that starts from the upper end side of the top seal portion 18 applied to the upper end of the bag body 12 and does not extend to the center side of the top seal portion 18. Can be formed. In this embodiment, the notch 16 is formed only on the upper end side of the top seal portion 18 or up to a position where it stays in the top seal portion 18, and is more than the top seal portion 18 in which the contents are stored. It does not reach the center side.

  For this reason, since the notch 16 gives the trigger for opening and expresses the simple cut property of the bag body 12, the contents do not reach these notches 16. Even in a fine case, the contents can be prevented from leaking to the outside, and at the same time, the contents can be prevented from being altered or deteriorated due to oxidation, moisture absorption, etc. due to contact with the outside air.

  In the embodiment shown in FIG. 4, the notch 16 is formed obliquely with respect to the fold-like end portion 12 a of the bag body 12. This is because, as shown in FIG. 4, the oblique formation is more suitable for smooth opening in the direction across the bag body. Therefore, as shown in FIG. 4, it is desirable that the notch 16 is formed in the vicinity of one end portion of the upper end of the bag body 12 and is inclined toward the other end portion. However, the notch 16 is not limited to the inclined notch 16, and the notch 16 can be formed in parallel with the fold-shaped end portion 12 a of the bag body 12. Similarly, in FIG. 4, the notch 16 is formed on the top seal portion 18 side. However, the notch 16 is formed on the bottom seal portion side (not shown), and starts from the lower end side than the bottom seal portion. Also, the notch 16 that does not extend to the center side can be formed, and further, the notch 16 can be formed in either the top seal portion 18 or the bottom seal portion.

  Furthermore, as another form of the notch 16, as shown in FIG. 5, the notch 16 is formed on the center side of the top seal portion 18 or the bottom seal portion, and the periphery of the notch 16 is sealed by the surrounding seal 20. The packaging bag 10 can also be used. Also in this case, the notch 16 is present on the content side, but the periphery thereof is sealed by the surrounding seal 20, so that the outflow and alteration of the content are prevented as in the embodiment shown in FIG. 4. Can do.

  The notch 16 of the embodiment shown in FIG. 5 can be formed simultaneously with the enclosure seal 20. Specifically, for example, a mold (not shown) having a shape such as a semicircular shape having a protrusion in the center is pressed against the vicinity of the top seal portion 18 of the bag body 12 to form the surrounding seal 20 and at the same time the protrusion of the mold The notch 16 can be made by making a cut. Of course, the forming method is not limited, and the notch 16 can be formed in the surrounding seal 20 after the surrounding seal 20 is formed. Further, the surrounding seal 20 is also formed in a substantially semicircular shape in the embodiment of FIG. 5, but the shape is not particularly limited as long as the outflow and alteration of the contents can be prevented. It can also be a shape.

  The present invention includes, for example, chemical raw materials such as polyethylene granules and chemical raw materials such as food additives, civil engineering and horticultural products such as fertilizer, culture soil, and gravel, food products such as salt, sugar, and rice mills, and pharmaceuticals. It can be widely applied to storage and transportation of various products.

DESCRIPTION OF SYMBOLS 1 Inflation molding machine 2 Pinch roll 3 Processing roll 3a Blade 4 Soft roll 10 Packaging bag 12 Bag body 12a Creased end 14 Processing to form cut 14a Cut 16 Notch 18 Top seal part 20 Surrounding seal

Claims (17)

A packaging bag having a bag body made of a raw material mainly composed of olefin and formed by folding the raw material processed into a cylindrical shape, wherein the bag main body is connected to the fold-like end portion of the bag main body from the end portion. A packaging bag characterized in that a process for forming a cut opening for crossing is continuously or periodically applied to the end portion. The bag for packaging bag goods according to claim 1, wherein a process of forming a cut end in the fold-shaped end portion of the bag body is performed over the entire length of the fold-shaped end portion. Packaging bag. 3. A bag packaging bag according to claim 1, wherein a plurality of the cut edges are formed periodically or continuously at the fold-shaped end portion. Packaging bag. The packaging bag according to any one of claims 1 to 3, wherein at least a part of the cut end extends over an outer edge of the bag body or faces the outer edge. A packaging bag, characterized in that a cut is provided in the outer edge of the main body. The packaging bag according to any one of claims 1 to 4, wherein the cut end has a hole shape, a linear shape, or a concave shape. 6. The packaging bag according to claim 1, wherein an end portion of the bag body has a seal portion formed along the end portion, and the cut end is formed in the seal portion. A packaging bag characterized by being formed. The packaging bag according to any one of claims 1 to 6, wherein the olefin as the main raw material is a cyclic olefin resin such as a cyclic olefin polymer or a cyclic olefin copolymer. Packaging bags. The packaging bag according to claim 1, wherein the bag body has a thickness of 50 μm to 300 μm. The packaging bag according to any one of claims 1 to 8, wherein the bag body has a top seal portion or a bottom seal portion, and an upper end side or a lower end than the top seal portion or the bottom seal portion. A packaging bag having a notch that starts from the side and does not extend to the center side of the top seal portion or the bottom seal portion. 10. The packaging bag according to claim 9, wherein the notch is formed in parallel with the fold-shaped end portion of the bag body or obliquely with respect to the fold-shaped end portion of the bag body. A packaging bag characterized by having The packaging bag according to any one of claims 1 to 8, wherein the bag body has a top seal portion or a bottom seal portion, and is formed closer to the center than the top seal portion or the bottom seal portion. A packaging bag comprising a notch and a periphery of the notch being sealed. A method of manufacturing a packaging bag having a bag main body made of a raw material mainly composed of olefin, after forming the bag main body from the raw material, sending out before or after winding the bag main body, While applying tension to the bag body, the crease-shaped end of the bag body is passed between a processing roll having a blade and a soft roll capable of receiving the blade, and the crease-shaped end of the bag body A process for producing a packaging bag, characterized in that a process for forming a cut for opening the bag so as to cross the bag body from the end is continuously or periodically applied to the end. The method for manufacturing a packaging bag according to claim 12, wherein the raw material is formed into a cylindrical shape and folded to form the bag body. 14. The method for manufacturing a packaging bag according to claim 12, wherein a process of forming a cut end in the fold-shaped end portion of the bag body is performed over the entire length of the end portion. A method for manufacturing a packaging bag. The method for manufacturing a packaging bag according to any one of claims 12 to 14, wherein a plurality of the cut ends are formed periodically or continuously at the fold-shaped end portion. A method of manufacturing a packaging bag. The method for manufacturing a packaging bag according to any one of claims 12 to 15, wherein at least a part of the cut end is formed across the outer edge of the bag body or facing the outer edge, A method for producing a packaging bag, wherein a cut is provided in an outer edge of the bag body. The method for manufacturing a packaging bag according to any one of claims 12 to 16, wherein the cut is formed in a hole shape, a linear shape, or a concave shape. Method.

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