JP2017217797A - Method for manufacturing bag body and method for forming cut and so on - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a bag body having a cut for tearing.SOLUTION: A method for manufacturing a bag body 1 having a cut 5 for tearing and/or a guide for tearing by use of a continuously transferred sheet 2 comprises a step at which a cut 5 for tearing and/or a guide for tearing is formed on a sheet 2 in the state that the sheet 2 is not folded up by use of first and second rollers 31, 32 which sandwich the sheet 2 continuously transferred in the state that the sheet 2 is not folded up and are rotated around an axis extending in a direction orthogonal to a transfer direction X of the sheet 2, and on an outer periphery of one roller 31 of which a cutting edge 31a is provided.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a manufacturing method of a bag body and a forming method such as cutting.

  Conventionally, a bag having a tear notch has been provided. As such a bag body, for example, in the following Patent Document 1, in a pillow type bag made of a film including at least a lateral uniaxially stretched film in its configuration, the end of the palm portion is a non-adhesive portion, and the center There has been disclosed an easy-open packaging material characterized in that the seal portion is a weak seal and two notches are provided as tear notches at the ends of the palm portion pieces.

JP-A-10-86948

  When manufacturing a bag body having a tear notch, the sheet is intermittently transferred while being temporarily stopped, and a member with a cutting blade that moves up and down and a cradle are used. When the tear notch is formed in the sheet by sandwiching the attachment member and the cradle from above and below, the sheet must be stopped to form the tear notch. Since it cannot transfer continuously, the said bag body cannot be manufactured efficiently.

  This invention is made | formed in view of such a situation, and is used for the manufacturing method of the bag body which can manufacture efficiently the bag body which has the cut for tearing, the manufacturing method of such a bag body, etc. It is an object of the present invention to provide a method for forming a notch or the like.

  The following aspects are presented as means for solving the problems. The bag body manufacturing method according to the first aspect is a bag body manufacturing method for manufacturing a bag body having tear notches and / or tearing guides using sheets that are continuously transferred. A first roller and a second roller that sandwich the sheet that is transported in an unfolded state and that rotate about an axis that extends in a direction orthogonal to the sheet transport direction, the outer circumference of one of the rollers Using the first and second rollers provided with cutting edges, and forming the tear notch and / or the tear guide on the sheet in a state where the sheet is not folded. It is.

  In the present specification, “and / or” means both or one of them.

  The number of tearing cuts may be one, or two or more. For example, a large number of V notches may be formed continuously as the cut.

  According to the first aspect, since the tearing incision and / or tearing guide is formed using the first and second rollers, the tearing incision and / or tearing guide is formed. Moreover, since the sheet can be continuously transferred without temporarily stopping the sheet, the bag body can be efficiently manufactured.

  In the bag manufacturing method according to the second aspect, in the first aspect, the cutting edge of the cutting edge extends in the orthogonal direction. This 2nd aspect gives the example of the direction where the blade edge | tip of the said cutting blade extends.

  In the bag manufacturing method according to the third aspect, in the first or second aspect, the tear guide is a perforation or a continuous or intermittent half-cut line. In the third aspect, an example of the tearing guide is given.

  According to a fourth aspect of the present invention, there is provided a bag body manufacturing method according to any one of the first to third aspects, wherein the bag body is a cylindrical body portion having one end side closed and the other end side opened. The body portion includes a first sheet portion having a first edge extending from the one end portion side to the other end portion side, and the other end portion side from the one end portion side. A second sheet portion having a second edge extending to the first sheet portion, and a region on the first edge side of the first sheet portion and a region on the second edge side of the second sheet portion. The first sheet portion is set to the outside and the second sheet portion is set to the inside to be overlapped in an envelope pasting shape, and the region between the first and second sheet portions superimposed in the envelope pasting shape is between At least an edge region along the first edge of the first sheet portion. In the adhesion region excluding the portion as the non-adhesion region, two tearing cuts were formed at intervals as the tearing cuts at the edge of the non-adhesion region of the first sheet portion. It is a bag.

  According to this fourth aspect, since the first and second sheet portions are enveloped, the non-adhesive region of the first sheet portion between the two tear notches is pinched. The bag body can be opened by pulling in the tearing direction intersecting the first and second edges. Therefore, according to the fourth aspect, unlike the bag body that is provided with a hand-sealed sticker such as the easy-open packaging material disclosed in Patent Document 1, the bonded part does not stand up, Can be opened easily.

  According to a fifth aspect of the present invention, there is provided the bag manufacturing method according to the fourth aspect, wherein at least one of the first and second sheet portions is between the two tear notches in the bag. In the adhesion region arranged in the tear direction with respect to the non-adhesion region of the sheet portion, the sheet has a laminated structure of two or more layers including an easily breakable layer, and in the bag body, the second portion between the two tear notches The non-adhesive region of one sheet portion is picked and pulled in a tearing direction intersecting the first and second edges, whereby the easy-breaking layer is destroyed, so that the adhesive region is aligned in the tearing direction. The adhesive strength between the layers of the first and second sheet portions and the strength of each layer are set so that the picked side is separated from the remaining side.

  In the specification of the present application, an easily breakable layer can maintain a laminated state with a layer laminated next to it in a normal use state, but the adjacent layer is manually peeled off without using a tool or the like. It means a layer that is easily broken into two layers (interlaminar fracture) by applying an external force. The fracture surface does not have to be tacky, and an easily breakable layer having no tackiness on the fracture surface may be referred to as a non-tacky easily breakable layer.

  The laminated structure may include a synthetic resin layer in addition to the easily breakable layer.

  In the fifth aspect, at least one of the first and second sheet portions is bonded to the non-bonded region of the first sheet portion between the two tear notches in a tearing direction. In the region, it has a laminated structure of two or more layers including an easily breakable layer, and picks up the non-adhesive region of the first sheet portion between the two tear notches and intersects with the first and second edges The easy-breaking layer is broken by pulling in the tearing direction, so that the first and second layers are separated from the remaining side in the adhesion region aligned in the tearing direction. The adhesive strength between each layer of the sheet portion 2 and the strength of each layer are set. Therefore, according to the fifth aspect, the breakage of the easily breakable layer is skillfully used at the time of opening, and the force by the pull is applied to the easily breakable layer in a linear form instead of a planar shape, so that the breaking force is applied to the easily breakable layer. Because of the concentration, the easily destructible layer is destroyed with a relatively small force. For this reason, according to the said 5th aspect, it can open with comparatively small force. On the other hand, unless the opening operation is performed, the destructive force does not concentrate on the easily breakable layer, so that there is no possibility of unintentional opening. Further, according to the fifth aspect, since the breakage of the easily breakable layer is skillfully utilized at the time of opening, the adhesive strength between the layers of the first and second sheet portions and the strength of the layers other than the easily breakable layer Even if it is high, it can be opened with a relatively small force. For this reason, according to the fifth aspect, the bag can be opened with a relatively small force without using a weak seal or a weak bond. can do. Further, according to the fifth aspect, since it is not necessary to use a weak seal or a weak bond, it is not necessary to perform a strict management that reduces variations in the strength of the weak seal or the weak bond during manufacturing. For this reason, the bag body can be easily manufactured.

  The bag body manufacturing method according to the sixth aspect is any one of the first to fifth aspects, wherein the bag body is a square bottom bag having a square bottom portion.

  In the sixth aspect, an example of the bag body is given, but in the first to fifth aspects, the bag body is not limited to a square bottom bag.

  A forming method according to a seventh aspect is a forming method for forming a perforation or a continuous or intermittent half-cut line into a continuously transported sheet, and folding the continuously transported sheet. First and second rollers that are nipped and rotated about an axis extending in a direction perpendicular to the sheet transfer direction, and a cutting blade is provided on the outer periphery of one of the rollers. And a second roller is used to form the notches or the half-cut lines in the sheet while the sheet is not folded.

  The forming method according to the seventh aspect can be used for the bag manufacturing method according to the first to sixth aspects. But the formation method by the said 7th aspect is not restricted to this.

  In the forming method according to the eighth aspect, in the seventh aspect, the cutting edge of the cutting edge extends in the orthogonal direction. In the eighth aspect, an example of the extending direction of the cutting edge of the cutting blade is given.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the bag body which can manufacture the bag body which has the cut for tearing efficiently, and formation methods, such as a cut | notch, which can be used for the manufacturing method of such a bag body, etc. are provided. can do.

It is a schematic perspective view which shows an example of the bag body manufactured by the manufacturing method of the bag body by the 1st Embodiment of this invention, Comprising: It is a schematic perspective view which shows the state which opened the opening part of the said bag body moderately is there. It is a schematic sectional drawing in alignment with the A-A 'line in FIG. It is the general | schematic expanded sectional view which expanded the B section in FIG. It is a schematic perspective view which shows the state which the accommodation thing was accommodated in the bag body shown in FIG. 1, and the opening part was obstruct | occluded, and became a bagging body. It is a general | schematic expanded sectional view which shows the opening process of the bag packing body shown in FIG. It is a schematic side view which shows typically an example of the bag making machine which manufactures the bag body shown in FIG. It is a schematic plan view which shows typically the vicinity of the original sheet roll and notch formation part in FIG. 6 from upper direction. It is C arrow line view in FIG. It is a schematic perspective view which shows the cylinder part with a gusset formed of the cylinder part formation part in FIG. It is a schematic perspective view which shows the cylinder part with a gusset for one bag body cut by the cutting part in FIG. It is a schematic perspective view which shows the bottom part formation process of the bag body by the bottom part formation part in FIG. It is a schematic perspective view which shows the bottom part formation process of the bag body after the state shown in FIG. 11 by the bottom part formation part in FIG. It is a schematic perspective view which shows the bottom part molding state of the bag body after the state shown in FIG. 12 by the bottom part shaping | molding part in FIG. It is a schematic perspective view which shows the bag body in which the bottom sheet was stuck by the bottom sheet sticking part in FIG. It is a schematic perspective view which shows an example of the bag body manufactured by the manufacturing method of the bag body by the 2nd Embodiment of this invention, Comprising: It is a schematic perspective view which shows the state which opened the opening part of the said bag body moderately is there. It is a schematic plan view which shows typically the vicinity of the original sheet roll and notch formation part of the bag making machine which manufactures the bag body shown in FIG. 15 from upper direction.

  Hereinafter, the manufacturing method of a bag body by this invention and formation methods, such as cutting, are demonstrated with reference to drawings.

  [First Embodiment]

  FIG. 1 is a schematic perspective view showing an example of a bag body 1 manufactured by the bag manufacturing method according to the first embodiment of the present invention, in which the opening 3 of the bag body 1 is opened moderately. It is a schematic perspective view which shows a state. FIG. 2 is a schematic cross-sectional view along the line A-A ′ in FIG. 1. FIG. 3 is a schematic enlarged cross-sectional view in which a portion B in FIG. 2 is enlarged. FIG. 4 is a schematic perspective view showing a state in which an article is accommodated in the bag body 1 shown in FIG. 1 and the opening 3 is closed to form a bag-packed body.

  A bag body 1 shown in FIG. 1 has a cylindrical trunk portion whose one end side (lower side in FIG. 1) is closed and whose other end side (upper side in FIG. 1) is opened. ing. In the bag body 1 shown in FIG. 1, the square bottom part 2F which obstruct | occludes the lower side of the said trunk | drum is provided, and it is comprised as a square bottom bag. But the bag body manufactured by the manufacturing method of the bag body by this invention is not restricted to a square bottom bag, For example, a flat bag like an envelope etc. may be sufficient.

  In this example, as shown in FIG. 2, the body portion is a single sheet 2 and is configured in a cylindrical shape with flange portions (gazette portions) 2 </ b> C and 2 </ b> D on both sides.

  In this example, the sheet 2 includes a first sheet portion 2A having a first edge 2a extending in a vertical direction in FIG. 1 (a direction orthogonal to the paper surface in FIG. 2), and a vertical direction in FIG. And a second sheet portion 2B having a second edge 2b extending in a direction perpendicular to the paper surface in FIG. Thus, in this example, the first and second sheet portions 2A and 2B are each a part of one sheet 2.

  As shown in FIG. 2, the region on the first edge 2a side of the first sheet portion 2A and the region on the second edge 2b side of the second sheet portion 2B are outside the first sheet portion 2A. In addition, the second sheet portion 2B is placed on the inner side, and is overlapped with an envelope. And between the said area | region of 1st and 2nd sheet | seat part 2A, 2B piled up in the said envelope sticking shape, at least one part of the edge part area | region along the 1st edge 2a of the 1st sheet | seat part 2A In the adhesion region R2 excluding the non-adhesion region R1, it is adhered. In this example, the non-adhesion region R1 is the entire edge region along the first edge 2a, but may be a part of the edge region. In order to facilitate understanding, in FIGS. 1 and 4, the adhesion region R2 of the first sheet portion 2A is hatched, and in FIGS. 1 to 3, the non-adhesion region of the first sheet portion 2A. R1 is shown in a state slightly turned up from the second sheet portion 2B. In this example, the sheet | seat 2 comprises the cylindrical trunk | drum by adhere | attaching between the 1st and 2nd sheet | seat parts 2A and 2B by adhesion | attachment area | region R2.

  As shown in FIG. 1, two tear notches 5 are formed at the edge of the non-adhesion region R1 of the first sheet portion 2A with a gap therebetween. This interval is set to an interval that can be picked up with a finger, for example. In this example, an I-notch is formed as the tearing notch 5, but not limited to this, a V-notch, U-notch, turtle-notch (home-base pentagonal notch with a triangular tip), etc. But you can. In this example, two tear notches 5 are formed, but three or more tear notches may be formed. For example, a large number of V notches may be formed continuously.

  In the present example, the bottom portion 2F is folded so that the lower portion of the same sheet 2 constituting the body portion is folded as shown in FIGS. 11 to 13 described later, and the folded state is maintained. As shown in FIG. 14 to be described later, the bottom sheet 4 is adhered to form a structure. The bottom sheet 4 is made of paper, for example.

  The bag body 1 according to the present example is manufactured by a bag manufacturer or the like and supplied to a manufacturer of stored items. The stored item manufacturer or the like receives a desired stored item from the opening 3 at the upper portion of the trunk. Is placed in the body part, and the part on the side of the opening 3 that is flattened by folding the heel parts 2C and 2D so that the opening 3 is closed is wound around the imaginary lines L1 and L2 twice. By being folded, a winding / folding portion 2G is formed. Then, the predetermined portion is bonded with an adhesive (not shown) so that the folded portion 2G keeps the folded state, whereby the upper opening 3 is closed and the bagging body is completed. To do. For example, the opening 3 may be closed by heat sealing without being folded (that is, without forming the folded portion 2G). The contents are not limited in any way, and may be, for example, agricultural chemicals, foods, medicines, etc., or powders, liquids, solids, and the like.

  In this example, at least one of the first and second sheet portions 2A and 2B is in a tearing direction with respect to the non-bonding region R1 of the first sheet portion 2A between the two tear notches 5 (FIGS. 1 to 5). 3 (right direction in FIG. 3) has a laminated structure of two or more layers including an easily breakable layer. In this example, specifically, one sheet 2 including the first and second sheet portions 2A and 2B is an easily breakable layer that is laminated in order from the inside of the bag 1 as shown in FIG. 3, a low-density polyethylene (LDPE) layer 12, a lateral uniaxial high-density polyethylene (HDPE) layer 13 as a layer provided with a linear cut property in the left-right direction in FIG. 3, and a low-density polyethylene (LDPE) ) A laminate film composed of a layer 14 and paper 15 as an easily breakable layer. This laminate film can be manufactured by, for example, extrusion lamination in which a molten PE layer 12 is poured between the paper 11 and the HDPE layer 13 and a molten PE layer 14 is poured between the HDPE layer 13 and the paper 15. it can. The paper 11 and the paper 15 may have the same inter-paper strength, or may have different inter-paper strengths.

  In this example, the paper 11 of the first sheet portion 2A and the paper 15 of the second sheet portion 2B are bonded by the adhesive 16 in the bonding region R2.

  In this example, the non-adhesive region R1 of the first sheet portion 2A between the two tear notches 5 is picked and the tear direction intersects the first and second edges 2a and 2b (the right direction in FIGS. 1 to 3). ), The paper 11 or the paper 15 is broken, and in the adhesion region R2 aligned in the tear direction, the first and second sides are separated from the remaining side. The adhesive strength between the layers 11 to 15 of the sheet portions 2A and 2B, the strength of the layers 11 to 15 and the adhesive strength of the adhesive 16 are set.

  The configuration of the sheet 2 is not limited to the configuration described above. Further, the bonding between the sheets 2 in the bonding region R2 is not limited to bonding by an adhesive, but may be bonding by heat sealing. Further, the easy-breaking layer is not limited to paper, but includes, for example, a non-adhesive easy-breaking layer as disclosed in Japanese Patent No. 3477178 (for example, a binder and a filler and bubbles contained in the binder). Or polyester synthetic paper (for example, polyester-based biaxially stretched film containing a cavity such as a product called “Crisper” manufactured by Toyobo Co., Ltd.) Also good.

  FIG. 5 is a schematic enlarged cross-sectional view showing a process of opening the bag-packed body shown in FIG. The opening of the bag-packed body shown in FIG. 4 is performed by the user of the stored item. When the user or the like of the contents opens the bag 1 that is a bag, the first and second non-adhesive regions R1 of the first sheet portion 2A between the two tear notches 5 are picked with fingers. When pulled in the tearing direction (the right direction in FIGS. 1 to 3) intersecting the second edges 2a and 2b, first, the non-adhesive region R1 of the first sheet portion 2A is extended so as to extend the tearing notch 5. The paper 11 or the paper 15 that is the easily breakable layer is broken in the vicinity of the right edge in FIG. 3 of the non-adhesive region R1 of the first sheet portion 2A between the two tearing notches 5 until the tear is cut. Go. When the non-bonding region R1 is further pulled in the right direction in FIGS. 1 to 3 and 5, the destruction of the paper 11 or the paper 15 further proceeds, and the first sheet portion 2A between the two tear notches 5 In the adhesion region R2 aligned in the tear direction (right direction in FIGS. 1 to 3) with respect to the non-adhesion region R1, the picked side is separated from the remaining side, and the tear notch 5 is further extended. The first sheet portion 2A is torn into a strip shape. When the non-adhesion region R1 is further pulled in the right direction in FIGS. 1 to 3 and 5, the first sheet portion 2A is further torn into a strip shape as shown in FIG. 5, and the bag 1 is opened. It will be done.

  According to this example, since the first and second sheet portions 2A and 2B are formed in an envelope shape, as described above, the non-adhesion region of the first sheet portion 2A between the two tear notches 5 The bag body 1 can be opened by picking R1 and pulling it in the tearing direction (the right direction in FIGS. 1 to 3) intersecting the first and second edges 2a, 2b. Therefore, according to the present example, unlike a bag body that is provided with a palm seal such as the easy-open packaging material disclosed in Patent Document 1, the bonded portion does not stand up, so that it can be easily opened. can do.

  Further, in this example, at least one of the first and second sheet portions 2A and 2B is in the tearing direction with respect to the non-adhesion region R1 of the first sheet portion 2A between the two tear notches 5 (FIG. 1 to FIG. In the adhesive region R2 aligned in the right direction in FIG. 3, the non-adhesive region R1 of the first sheet portion 2A between the two tear notches 5 has a laminated structure of two or more layers including an easily breakable layer. By picking and pulling in the tearing direction (right direction in FIGS. 1 to 3) intersecting with the first and second edges 2a and 2b, the easily breakable layer is broken, so that the tearing direction (FIGS. 1 to In the adhesive region R2 aligned in the right direction in FIG. 3, the adhesive strength between the layers 11 to 15 of the first and second sheet portions 2A and 2B so that the picked side is separated from the remaining side. , Strength of each layer 11-15 and adhesive 1 The adhesive strength of the has been set. Therefore, according to this example, the breakage of the easily breakable layer is skillfully used at the time of opening, and the force due to the tension is applied to the easily breakable layer in a linear form instead of a plane, so that the breaking force is concentrated on the easily breakable layer 14. Therefore, the easily breakable layer 14 is broken with a relatively small force. For this reason, according to this example, it can open with comparatively small force. On the other hand, unless the opening operation is performed, the destructive force does not concentrate on the easily breakable layer, so that there is no possibility of unintentional opening. In addition, according to this example, since the breakage of the easily breakable layer is skillfully used at the time of opening, the adhesive strength between the layers 11 to 15 of the first and second sheet portions 2A and 2B, layers other than the easily breakable layer Even if the strength of 12 to 14 is high, it can be opened with a relatively small force. For this reason, according to this example, since it can be opened with a relatively small force without using a weak seal or weak adhesion, the bag 1 can be opened with a relatively constant relatively small force with little variation for each bag body 1. Can do. Further, according to this example, it is not necessary to use a weak seal or weak adhesion, and therefore, at the time of manufacture, strict management that reduces the variation in the strength of the weak seal or weak adhesion is not necessary. The bag body 1 can be easily manufactured.

  Furthermore, according to this example, since the first and second sheet portions 2A and 2B constitute the same sheet 2, it can be easily manufactured.

  In this example, the first edge 2a of the first sheet portion 2A is not overlapped with the left end edge 2L of the body portion, and is disposed on the inner side from the left end edge 2L by a predetermined distance. For this reason, when the non-adhesive region R1 of the first sheet portion 2A between the two tear notches 5 is picked, the finger is guided using the surface of the bag body 1 as a guide, and slides inside the non-adhesive region R1. The non-adhesion region R1 becomes easy to pick. However, in the present invention, the first edge 2a of the first sheet portion 2A may overlap with the left end edge 2L of the body portion.

  Further, in this example, as described above, the tear direction is the right direction in FIGS. 1 to 3 (that is, the non-adhesion region R1 of the first sheet portion 2A between the two tear notches 5). The bag body 1 is opened by pulling it in the right direction in FIG. 1 to FIG. 3), but the right and left in FIG. 1 to FIG. You may comprise so that a direction may become the left direction in FIG.

  Next, an example of a method for manufacturing the bag body 1 shown in FIG. 1 will be described as a bag body manufacturing method according to the first embodiment of the present invention.

  FIG. 6 is a schematic side view schematically showing an example of the bag making machine 21 that manufactures the bag body 1 shown in FIG. 1. In FIG. 6, the thick line indicates the path of the sheet 2 that is unwound from the original sheet roll 2 ′ and continuously transferred in the substantially left direction in FIG. 6. FIG. 7 is a schematic plan view schematically showing the vicinity of the original sheet roll 2 ′ and the notch forming portion 23 in FIG. 6 as viewed from above. Each region R <b> 21 of the sheet 2 in FIG. 7 indicates a region that becomes one bag body 1. FIG. 8 is a view taken in the direction of arrow C in FIG. 7 and 8, an arrow X indicates the transport direction of the sheet 2.

  As shown in FIG. 6, the bag making machine 21 includes a support portion 22 that supports the unrolled original sheet roll 2 ′ around which the sheet 2 is wound, a notch forming portion 23, a guide portion 24, and gluing A part 25, a tube part forming part 26, a cutting part 27, a bottom part forming part 28, a bottom sheet attaching part 29, and an inspection table 30 are provided.

  The notch forming unit 23 includes a first roller 31 and a second roller 32. The first roller 31 and the second roller 32 sandwich the sheet 2 that has been unwound from the original sheet roll 2 ′ and continuously transferred in the direction of the arrow X in an unfolded state, and the sheet 2 rotates around an axis extending in a direction perpendicular to the transfer direction X (a direction perpendicular to the paper surface in FIG. 8). The upper first roller 31 in FIG. 8 rotates in the clockwise direction in FIG. 8, and the lower second roller 32 in FIG. 8 rotates in the counterclockwise direction in FIG. On the outer periphery of the first roller 31, a cutting blade 31a for forming the above-described tearing cut 5 is provided. In the present embodiment, two cutting blades 31a are formed in accordance with the two tearing cuts 5, and the cutting edges of each cutting blade 31a extend in the orthogonal direction. The second roller 32 is a receiving roller that receives the cutting edge 31a. Although not shown in the drawings, a known mechanism can be adopted as a support / rotation mechanism for the rollers 31 and 32.

  The notch forming unit 23 uses the first and second rollers 31 and 32 to form the tear notch 5 in the sheet 2 in a state where the sheet 2 continuously transferred in the arrow X direction is not folded. Perform stages.

  The guide part 24 guides the sheet 2 on which the notch 5 for tearing has been formed by the notch forming part 23 to the gluing part 25.

  The gluing unit 25 performs a step of applying the glue forming the adhesive 16 in the region R2 of the bag body 1 to the sheet 2 on which the tear notch 5 is formed and transferred. Although not shown in the drawing, this glue is applied to the sheet 2 in a strip shape so as to extend in the transfer direction of the sheet 2.

  The tube forming portion 26 folds the sheet 2 to which the glue is applied by the gluing portion 25 so as to have flange portions on both sides along six fold lines (not shown) extending in the transport direction of the sheet 2. Then, a predetermined portion (including a portion corresponding to the region R2) is adhered to each other with the glue forming the adhesive 16, thereby forming a tubular portion 1 'with a gusset shown in FIG. FIG. 9 is a schematic perspective view showing the tubular portion 1 ′ with gusset formed by the tubular portion forming portion 26 in FIG. 6. Each region R <b> 21 ′ of the cylinder portion 1 ′ with gussets in FIG. 9 indicates a region that becomes one bag body 1.

  The cutting part 27 performs a step of cutting the cylindrical part 1 ′ with gusset formed by the cylindrical part forming part 26 into the cylindrical parts 1 ″ with gussets of the individual regions R21 ′. FIG. 10 shows the cutting part in FIG. 27 is a schematic perspective view showing a tubular portion 1 ″ with a gusset for one bag body cut by 27. FIG.

  The bottom molding part 28 folds one end side of the cylinder part 1 ″ with gusset as shown in FIG. 11, then as shown in FIG. 12, and further as shown in FIG. Fig. 11 is a schematic perspective view showing a bottom molding process of the bag body 1 by the bottom molding section 28 in Fig. 6. Fig. 12 is a bottom molding section in Fig. 6. Fig. 13 is a schematic perspective view showing a bottom molding process of the bag body 1 after the state shown in Fig. 11. Fig. 13 is a bottom view of the bag body 1 after the state shown in Fig. 12 by the bottom molding portion 28 in Fig. 6. It is a schematic perspective view which shows a shaping | molding state.

  The bottom sheet adhering portion 29 performs a step of adhering the bottom sheet 4 to the folded portion forming the square bottom portion 2F formed by the bottom forming portion 28 as shown in FIG. 13 so as to keep the folded state. Thereby, the square bottom part 2F is completed, the bag body 1 is completed, and this bag body 1 is carried out to the inspection table 1. FIG. 14 is a schematic perspective view showing the bag body 1 to which the bottom sheet 4 is stuck by the bottom sheet sticking portion 29 in FIG. 6.

  As described above, the method of manufacturing the bag 1 according to the present embodiment includes the steps of forming the tearing notch by the notch forming portion 23, applying the glue forming the adhesive 16 by the gluing portion 25, and the cylindrical portion forming portion 26. Forming a cylindrical portion 1 ′ with a gusset by cutting, cutting a cylindrical portion 1 ″ with a gusset of one bag body by a cutting portion 27, and forming a square bottom portion 2F by a bottom molding portion 28. And a step of attaching the bottom sheet 4 by the bottom sheet attaching portion 29.

  In addition, each part 22 and 24-30 of the bag making machine 21 shown in FIG. 6 can be comprised similarly to each part of the well-known bag making machine which manufactures a square bottom bag.

  According to the present embodiment, the tear notch 5 is formed by using the first and second rollers 31 and 32. Therefore, in order to form the tear notch 5, the sheet 2 is temporarily stopped without being stopped. Since 2 can be continuously transferred, the bag body 1 can be manufactured efficiently.

  Further, according to the present embodiment, the tear notch 5 is formed in the sheet 2 by the first and second rollers 31 and 32 in a state where the sheet 2 is not folded, so that the first sheet The bag body 1 having the tear notch 5 formed at the edge of the non-adhesive region R1 of the portion 2A can be manufactured. If the tear notch 5 is formed in a state where the sheet 2 is folded, the manufacture of the bag body 1 having the tear notch 5 formed at the edge of the non-adhesive region R1 of the first sheet portion 2A is as follows. It is impossible.

  [Second Embodiment]

  FIG. 15 is a schematic perspective view showing an example of the bag body 41 manufactured by the bag manufacturing method according to the second embodiment of the present invention, in which the opening portion 3 of the bag body 41 is opened to a medium degree. It is a schematic perspective view which shows a state, and respond | corresponds to FIG. 15, elements that are the same as or correspond to those in FIG. 1 are given the same reference numerals, and redundant descriptions thereof are omitted.

  The bag body 41 shown in FIG. 15 is different from the bag body 1 shown in FIG. 1 in that a single sheet 2 including the first and second sheet portions 2A and 2B has an HDPE layer (with a linear cut property). Layer) 13, LDPE layer 14, and paper 15 (easy to break layer) are removed, and a sheet 2 is laminated in order from the inside of the bag 1, and a laminate composed of a paper 11 as an easily breakable layer and an LDPE layer 12. It is only a point that is a film and a perforation 5 ′ that serves as a tearing guide is formed on the extension line of the two tearing cuts 5.

  In the bag body 41 shown in FIG. 15, since the perforation 5 ′ is formed in the first sheet portion 2A, the first sheet portion 2A does not include the HDPE layer 12 as a layer having a linear cut property. Nevertheless, easy-openability can be further improved. However, in this example as well, the HDPE layer 12 may be provided on the sheet 2 in the same manner as the bag 1 shown in FIG.

  As a bag manufacturing method according to the second embodiment of the present invention, an example of a method for manufacturing the bag 41 shown in FIG. 15 will be described.

  16 is a schematic plan view schematically showing the vicinity of the original sheet roll 2 ′ and the notch forming portion 23 of the bag making machine for manufacturing the bag body 41 shown in FIG. 15 as viewed from above, and corresponds to FIG. ing. 16, elements that are the same as or correspond to those in FIG. 7 are given the same reference numerals, and redundant descriptions thereof are omitted.

  The bag making machine for producing the bag body 41 shown in FIG. 15 is different from the bag making machine 21 for producing the bag body 1 shown in FIG. 1 in that the first and second rollers 31 and 32 are provided in the notch forming portion 23. It is long in the axial direction so as to cover the entire width of the sheet 2, and not only the cutting blade 31 a for forming the tearing notch 5 but also the perforation 5 ′ is formed on the outer periphery of the first roller 31. This is only the point where the cutting edge 31a 'is also formed.

  The method for manufacturing the bag body 41 shown in FIG. 15 differs from the method for manufacturing the bag body 1 shown in FIG. 1 in that the original sheet roll 2 ′ is used by using the first and second rollers 31 and 32 described above. The only difference is that a perforation 5 ′ as a tearing guide is formed simultaneously with the tearing notch 5 on the sheet 2 unwound from the sheet and continuously transferred in the direction of the arrow X.

  According to the present embodiment, the same advantages as those of the first embodiment can be obtained. Further, according to the present embodiment, since the perforation 5 ′ as the tearing guide is formed at the same time as the tearing notch 5, the bag body 41 can be easily manufactured as compared with the case where both are formed separately. Can do.

  In the bag body 41 shown in FIG. 15, the perforation 5 ′ may be extended to the edge of the non-adhesion region R <b> 1 of the first sheet portion 2 </ b> A without forming the tearing notch 5. When manufacturing this bag body, the cutting blade 31a may be removed on the outer periphery of the first roller 31, and the cutting blade 31a 'may be extended to the position of the cutting blade 31a.

  As the tearing guide, a continuous or intermittent half-cut line may be formed instead of the perforation 5 '. Such a half-cut line can be formed, for example, by reducing the height of the cutting edge formed on the outer periphery of the first roller 31.

  As mentioned above, although each embodiment of this invention and its modification were demonstrated, this invention is not limited to these.

  For example, the present invention is an example in which the “formation method for forming continuous cuts or continuous or intermittent half-cut lines” is applied to a bag manufacturing method according to the present invention. The “formation method of forming a perforated line or a continuous or intermittent half-cut line in a continuously transported sheet” may be applied in addition to the bag manufacturing method.

DESCRIPTION OF SYMBOLS 1,41 Bag body 2 Sheet | seat 2A 1st sheet | seat part 2B 2nd sheet | seat part 2a 1st edge 2b 2nd edge 3 Opening part 31 1st roller 31a Cutting blade 32 2nd roller R1 Non-adhesion area | region R2 Bonding area

Claims (8)

A method of manufacturing a bag body that uses a sheet that is continuously transferred to manufacture a bag body having a tear notch and / or a tear guide,
A first roller and a second roller that rotate around an axis extending in a direction perpendicular to the sheet transfer direction, sandwiching the sheet that is continuously transferred in an unfolded state, and one of the rollers Forming the tear notch and / or the tear guide on the sheet in a state where the sheet is not folded, using the first and second rollers provided with cutting edges on the outer periphery thereof. A method of manufacturing a bag body characterized by the above.   The method for manufacturing a bag according to claim 1, wherein a cutting edge of the cutting blade extends in the orthogonal direction.   3. The bag manufacturing method according to claim 1, wherein the tear guide is a perforation or a continuous or intermittent half-drawn line. The bag body is a bag body having a cylindrical body portion that is closed on one end side and opened on the other end side,
The body portion has a first sheet portion having a first edge extending from the one end portion side to the other end portion side, and a second edge extending from the one end portion side to the other end portion side. A second sheet portion,
The region on the first edge side of the first sheet portion and the region on the second edge side of the second sheet portion make the first sheet portion outside and the second sheet portion. With the inside facing in an envelope
Between the regions of the first and second sheet portions superimposed in the envelope pasting shape, at least a part of the edge region along the first edge of the first sheet portion is defined as a non-adhesive region. In the bonded area except,
A bag body in which two tearing cuts are formed at an interval as the tearing cuts at the edge of the non-adhesive region of the first sheet portion.
The manufacturing method of the bag body in any one of Claims 1 thru | or 3 characterized by the above-mentioned. In the bag body, at least one of the first and second sheet portions is in the adhesion region aligned in the tear direction with respect to the non-adhesion region of the first sheet portion between the two tear notches. , Having a laminated structure of two or more layers including an easily breakable layer,
In the bag body, the easily breakable layer is formed by pinching the non-adhesive region of the first sheet portion between the two tear notches and pulling in the tearing direction intersecting the first and second edges. By being broken, in the bonding region aligned in the tearing direction, the adhesive strength between the layers of the first and second sheet portions and the layers of the layers are separated so that the picked side is separated from the remaining side. Strength is set,
The manufacturing method of the bag body of Claim 4 characterized by the above-mentioned.   The method for manufacturing a bag according to any one of claims 1 to 5, wherein the bag is a square-bottom bag having a square bottom. It is a forming method in which cuts are made in continuously transported sheets to form perforations or continuous or intermittent half-cut lines,
A first roller and a second roller that rotate around an axis extending in a direction perpendicular to the sheet transfer direction, sandwiching the sheet that is continuously transferred in an unfolded state, and one of the rollers The first and second rollers provided with cutting edges on the outer periphery of the sheet are used, and the sheet is cut and the perforation or the half-cut line is formed in a state where the sheet is not folded. Forming method.   The forming method according to claim 7, wherein a cutting edge of the cutting blade extends in the orthogonal direction.

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