JP2007144895A - Manufacturing method and manufacturing apparatus of paper tube for paper bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inhibit the gap between edges at the ends in a length direction when forming a paper tube having M character-like insertion sections at both sides. <P>SOLUTION: After a sheet 1 is folded up into a twofold from the center section to a width direction and both end edges F1 and F2 in the width direction are bonded to form a flat paper tube 5 before forming M character-like insertion sections 2 and 3, the M character-like insertion sections 2 and 3 are formed at both sides in the width direction of the paper tube 5. Since end edges F1 and F2 in the width direction folded up into a twofold are bonded together before forming M character-like insertion sections 2 and 3, the end edges F1 and F2 in the length direction of the sheet 1 are correctly faced together, and these end edges F1 and F2 can be bonded together. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a paper bag paper tube that continuously forms a paper tube used as a paper bag for a shopping bag, for example.

  2. Description of the Related Art Conventionally, a paper bag such as a shopping bag is folded into a substantially M shape on both sides, and a bottom is folded to form a square bottom portion (for example, Patent Document 1).

  When such a square bottom paper bag is molded by a bag making machine, first, a flat paper tube is formed by folding both sides into a substantially M shape, and the bottom of the paper bag is folded by folding the bag mouth of the paper tube. . Then, as a method of making the flat paper tube, as shown in FIG. 18 (A), three parallel folds are formed at one end edge portion and a substantially central portion of the sheet-like sheet 1 cut into a predetermined size in advance. The lines 2a, 2b, 2c and 3a, 3b, 3c are formed, and the folded lines 2a, 2b, 2c and 3a, 3b, 3c are folded into an M shape as shown in FIG. After pasting on the outer edge of 1, as shown in FIG. 19 (A), the sheet 1 is folded in half from the center, and the glued part of the outer edge is pasted together. As shown in (B), a flat paper tube 5 having M-shaped folds 2 and 3 on both sides is formed. Then, the folded paper tube 5 is supplied to the square bottom bag making machine, and the bottom of the paper tube 5 is folded to form a square bottom paper bag.

  The folding lines 2a, 2b, and 2c are folded in an M shape to form a folding line 2A, a folding line 2B, and a folding line 2C, and the folding lines 3a, 3b, and 3c are folded in an M shape to form a folding line 3A, A fold line 3B and a fold line 3C are formed. Further, the folding part 2 is an end folding part provided at the end of the sheet 1, and the folding part 3 is a central folding part 3 provided at the center of the sheet 1.

  In addition, there is a method of forming a paper tube while transporting the base paper wound up in a roll shape, but this method using the base paper in the roll shape is suitable for mass production, but the printing of the paper tube is changed. On the other hand, the sheet 1 is not suitable for small-volume production, and is suitable for small-volume production in which printing or the like changes.

By the way, when the paper tube 5 is formed, the sheet 1 is conveyed and supplied by a conveyance conveyor (not shown), and the creasing plate 2a, 2b of the folding portions 2, 3 is pressed by pressing the creasing plate against the sheet 1 during the conveyance. , 2c and 3a, 3b, 3c. Next, the guide plate 6 is slid into the outer back surface in a state where the inner sides of the folding lines 2a, 3a formed on the innermost side are suppressed by a regulating means such as a regulating belt. The guide plate 6 is formed with an inclined portion 6A for guiding the folding portions 2 and 3 of the sheet 1 inward, and the intermediate folding lines 2b and 3b are moved inward as the sheet 1 is moved by the conveyor. To bite into. Thereby, the folding part 2 of the edge part of the sheet 1 is folded in M shape. Then, the folding part 3 in the central part of the sheet 1 is folded into an M shape by folding the sheet 1 back to the front side from the outer folding line 3c formed in the central part.
JP 11-91012 A

  In the folding method of the paper bag and the paper tube by the bag making machine, the folded paper 2 is folded and the folding lines 2a, 2b, 2c and the folding lines 3a, 3b are folded after leaving the folding line 3c. The folding line 3c located substantially in the center of the sheet 1 is folded in two and glued portions at both end edges are bonded to each other, and the folding lines 2a, 2b, 2c and the folding lines 3a, 3b are conveyed while being conveyed. When the folding is performed together, there is a problem that if a slight shift occurs in the folding position, a positional shift occurs between the edges in the length direction as shown in FIG.

  Therefore, the present invention solves such a problem, and when forming a paper tube having M-shaped folds on both sides, a paper bag paper tube that can prevent the edges of the end portions in the length direction from shifting from each other. An object of the present invention is to provide a manufacturing method and a manufacturing apparatus thereof.

  In order to solve the above-mentioned problem, a paper bag paper tube manufacturing method according to claim 1 of the present invention is a sheet of paper that is folded into two in the width direction from the center and folded into two. In the folding method of the paper bag paper tube for forming the paper tube having the M-shaped folds on both sides, the sheet is attached before forming the M-shaped folds. In this method, the paper tube is formed by folding it in the width direction from the center and bonding both edges in the width direction to form a paper tube, and then forming the M-shaped folded portions on both sides of the paper tube in the width direction.

  The manufacturing method of the paper bag paper tube according to claim 2 of the present invention is a method in which the M-shaped fold portion has a fold line, a fold line, and a fold line that are substantially parallel to each other.

  According to a third aspect of the present invention, there is provided a manufacturing apparatus for a paper bag paper tube according to the first or second aspect of the present invention, wherein the paper bag paper tube is folded at one end edge and the central portion of the sheet before folding. Folding line forming means for forming a streak, and a cylindrical formation in which the paper sheet is folded in two in the width direction from the center part and a paper tube in which both edges in the width direction are bonded is widened while being conveyed. And a folding part forming means for forming the M-shaped folding part by folding the folding line in conjunction with the conveying operation.

  According to the configuration of claim 1, before forming the M-shaped folded portion, the end portions in the width direction folded in two are overlapped and bonded together. The end edges can be bonded together by properly aligning the two.

  According to the structure of Claim 2, an M-shaped folding part is formed from a substantially parallel folding line, a folding line, and a folding line.

  According to the configuration of the third aspect, before forming the M-shaped folding part, the flat paper cylinder made of a sheet of paper that is folded in two and bonded together at the end edges is formed into a cylindrical shape by the cylindrical forming means. The folded portion can be formed on both sides of the paper tube by the folded portion forming means while the cylindrical paper tube is conveyed.

  Embodiments of the present invention will be described below with reference to FIGS. In addition, the same code | symbol is attached | subjected to the part which has the same function as the paper cylinder 5 shown in the prior art example of FIGS. 18-19, and only a different part is demonstrated.

  The paper tube manufacturing apparatus 10 includes folding line forming means 30 for forming the folding lines 2a, 2b, 2c and 3a, 3b, 3c substantially parallel to the sheet 1 fed one by one from the sheet feeding means 20. Gluing means 40 for gluing to one inner surface side of the edge in the width direction of the sheet 1 and the folding line 2a of the sheet 1 glued by the gluing means 40 are folded and from the folding line 3c. Folding means 50 that folds the sheet 1 in half and overlaps the edges of the sheet 1 so that the edges overlap each other. A cylindrical forming means 60 that expands the paper cylinder 5 made of the sheet 1 into a cylindrical shape substantially corresponding to the interval between the folding lines 2a and 2c and the interval between the folding lines 3a and 3c, and the paper that has been expanded into a cylindrical shape. Folding part formation that folds the folding lines 2a, 2b, 2c and 3a, 3b, 3c of the cylinder 5 and folds both sides of the paper cylinder 5 into an M shape to form the folding parts 2, 3 It includes a stage 70, and a conveying means 80 for continuously conveying the paper feed unit sheet 1 sent from 20 to folding portion forming means 70.

  The folding lines 2 a, 2 b, 2 c are provided at one side edge F <b> 1 in the width direction of the sheet 1, and the folding lines 3 a, 3 b, 3 c are provided at a substantially central part in the width direction of the sheet 1.

  In this example, the sheet 1 is folded in a direction crossing the conveyance direction, that is, the sheet 1 is conveyed in the length direction indicated by the arrow Y, but the sheet 1 is indicated on one side indicated by the arrow Z. It may be folded while being conveyed in the width direction or the other side width direction opposite to the arrow Z to form a flat paper tube 5. In each of the following embodiments, the conveyance direction is indicated by the arrows Y, Z and the arrow. The reverse direction of Z, or the reverse direction of arrow Y may be used.

  It should be noted that printing is applied to the outer surface of the paper tube 5 of the sheet 1.

  As shown in FIGS. 5 and 6, the paper feeding means 20 folds the storage unit 21 that stores a plurality of sheets 1 in a stack and the uppermost sheet 1 of the storage unit 31 one by one. And a transport unit 22 for feeding the streak forming means 30.

  As shown in FIGS. 4 to 6, the folding line forming means 30 is provided with a pair of upper and lower rotating shafts 31, 31 </ b> A, and on the right side (conveying direction right side) and the center side of these rotating shafts 31, 31 </ b> A, A pair of folding line rollers 32, 32, 32A, 32A are provided, and the upper folding line roller 32 has a ridge 33 and a groove corresponding to the fold lines 2a, 2b, 2c and 3a, 3b, 3c. 34 and the ridges 33 are formed so as to be substantially parallel to each other, and the recesses 34, the ridges 33, and the recesses 34 are formed to be substantially parallel to each other on the lower folding line roller 32A. In addition, a pair of upper and lower feed rollers 81, 81 A constituting a part of the transport unit 80 are provided between the transport unit 22 and the folding line forming unit 30.

  Therefore, the sheet 1 fed between the sheet feeding means 20 and the folding rollers 32 and 32A is sent by the conveying means 80, while being fed by the upper and lower ridges 33 and the ridges 34 of the folding rollers 32 and 32A. The folding lines 2a, 2b, 2c and 3a, 3b, 3c are formed. The folding lines 2A and 3A and the folding lines 2C and 3C are downwardly protruding streaks, and the folding lines 2B and 3B are upwardly protruding streaks. Note that the upper surface of the sheet 1 before folding is the inner surface of the paper tube 5, and the lower surface is the outer surface of the paper tube 5.

  As shown in FIGS. 4 and 6, the gluing means 40 is provided on the carry-out side of the folding line forming means 30, and the gluing means 40 is connected to the other end F <b> 2 in the width direction of the sheet 1. The spray portion 41 sprays liquid glue onto the inner surface of the sheet 1, and the spraying portion 41 applies the liquid glue 42 and the like to the sheet 1 in accordance with the width between the folding line 2 a and the edge of the other widthwise edge F 2. Spray.

  The sheet 1 glued in the entire length direction (in this example, the conveyance direction) by the gluing means 40 is transferred to the second roller by an upper roller (not shown) and a lower roller 83 that constitute the conveyance means 80. It is continuously sent to the folding means 50. That is, at least one of the upper and lower rollers 83 is driven to rotate. As shown in FIGS. 3 and 7, the bi-folding means 50 includes left and right inner guide plates 11L and 11R whose outer edges substantially follow the folding lines 2a and 3c and the sheet 1 passes below. Outer guide plates 51 and 51 which are located outside the inner guide plates 11L and 11R and guide the sheet 1 so as to lift the edge portions F1 and F2 of the sheet 1 as it is conveyed. It consists of a plurality of guide rods 52, 52, etc. that guide the lifted edge portions F1, F2 so as to be folded back toward the center. Further, in the double folding means 50, the lower surface of the sheet 1 is guided by a plurality of rollers 83 constituting a part of the conveying means 80, and conveyed by the upper upper conveyor belt 84 or the like. The upper conveyor belt 84 is in contact with the upper surface of the sheet 1 between the inner guide plates 11L and 11R, and is driven so that the belt in contact with the upper surface moves in the conveying direction. Further, when the edge portions F1 and F2 overlapped by the two-folding means 50 pass through the pressure roller 53 and the lower roller 83 provided in the upper portion, they are sandwiched from above and below and are securely glued.

  Therefore, as the sheet 1 is transported, the one side edge F1 is folded back from the folding line 2a located at the outer edge of the inner guide plate 11R, and the other from the folding line 3c located at the outer edge of the inner guide plate 11L. The side edge portion F2 is folded back to the surface side, and both end edge portions F1 and F2 are overlapped.

  Further, the inner guide plate 11R is continuously provided to the end side of the folding portion forming means 70, and the inner guide plate 11L is provided continuously to the front of the folding portion forming means 70, and these inner guide plates 11L. , 11R, a center side guide plate 12 is provided, and as shown in FIG. 3 and the like, the outer edge of the center side guide plate 12 substantially corresponds to the folding line 3a. It is provided continuously up to the end side of the forming means 70. The sheet 1 passes under the central guide plate 12.

  In this way, the sheet 1 conveyed by the conveying means 80 from the paper feeding means 20 and passing through the bi-folding means 50, the folding lines 2a and the folding lines as shown in FIGS. In 3c, the edge side is folded back in the direction crossing the conveying direction to form the folding line 2A and the folding line 3C, and the edge portions F1 and F2 are overlapped and glued to form a flat paper tube 5. Therefore, since the edge portions F1 and F2 are glued together in a state where the folding line 2A and the folding line 3C are folded back, it is difficult for the edge portions F1 and F2 to overlap each other in the length direction. Gluing can be performed with the edges in the length direction being aligned.

  Next, the paper cylinder 5 is continuously fed from the bi-folding means to the cylindrical forming means 60. As shown in FIGS. 8 to 10, the cylindrical forming means 60 is provided with enlarged guide plates 61, 61 corresponding to the inner guide plate 11 </ b> R and the central guide plate 12. As shown in FIG. 10, the enlarged guide plate 61 is provided on the carry-in side (right side in FIG. 11), and an upward inclined portion 62 that is inclined in a direction away from the inner guide plate 11 R and the central guide plate 12. A horizontal portion 63 provided continuously with the climbing inclined portion 62 and substantially parallel to the inner guide plate 11, and provided on the carry-out side (left side in FIG. 11) and inclined toward the inner guide plate 11R and the central guide plate 12 And a descending inclined portion 71 are integrally provided. The inner guide plate 11 has a lower surface along the lower inner surface where the two paper cylinders 5 overlap, and the enlarged guide plate 61 has an upper surface along the upper inner surface where the two paper tubes 5 overlap. Yes, the distance between the outer edges of the inner guide plate 11R and the central guide plate 12 corresponds to the distance between the folding line 2a and the folding line 3a, and the distance between the left and right horizontal parts 63, 63 is between the folding line 2C and the folding line 3c. Further, the distance between the guide plates 11R, 12 and the horizontal portions 63, 63 in the height direction is slightly smaller than the distance between the folding line 2a and the folding line 2C. The cylindrical forming means 60 is composed of the guide plates 11L and 12 and the upward inclined portion 62 and the horizontal portion 63 of the enlarged guide plate 61. Further, as shown in FIG. 8, the climbing inclined part 62 on the folding part 2 side is formed with a steeper and shorter angle than the climbing inclined part 62 on the folding part 3 side.

  The folding portion forming means 70 includes an inner guide plate 11R corresponding to the descending inclined portion 71 and a portion of the central guide plate 12, and further, a pair of left and right folding guide rods 72 toward the carry-out side, and a plurality of left and right pairs. The first to fourth folding rollers 91, 92, 93, 94 are provided. The folding guide rod 72 has a linear portion 73 on the outer end side in the width direction arranged in the width direction, a semicircular curved portion 74 is provided on the inner end side of the linear portion, and the spacing between the left and right curved portions 74, 74 is Is slightly smaller than the left and right width of the paper tube 5, and the height position of the curved portion 74 is located at the approximate center of the height dimension of the paper tube 5 in the horizontal portion 63.

  As shown in FIG. 8, the first to fourth folding rollers 91, 92, 93, 94 are provided side by side along the transport direction, and the fourth folding roller 94 is arranged on the carry-out side. The folding rollers 91, 92, 93, 94 are formed such that the diameter increases from the first folding roller 91 toward the fourth folding roller 94 and the outer peripheral thickness decreases. The folding rollers 91, 92, 93, 94 are each provided with a rotary shaft 97 via a bearing 96 at the tip of a mounting shaft 95 having a width direction, and are provided at the lower end of the rotary shaft 97. The mounting shaft 95 is fixed to the mounting member 101 provided in the position so that the position of the mounting shaft 95 can be adjusted in the left-right direction (direction intersecting the transport direction) and can be rotated. That is, as shown in FIG. 9, the mounting member 101 has a horizontal insertion hole 102 through which the mounting shaft 95 is inserted, and a slit 103 that communicates the insertion hole 102 with the outside. By sliding the mounting shaft 95 along the axial direction, the left and right positions of the folding rollers 91, 92, 93, 94 can be adjusted. By rotating the mounting shaft 95 in the insertion hole 102, the folding roller 91 , 92, 93 and 94 can be adjusted with respect to the horizontal plane, and the insertion bolt 102 is tightened and the mounting shaft 95 is fixed by tightening the bolt 104 inserted into the slit 103 position and narrowing the slit 103 width. can do. Further, the mounting member 101 is provided with a vertical hole 106 through which the vertical vertical axis 13 provided in the manufacturing apparatus 10 is inserted, and further, a slit 107 is provided to connect the vertical hole 106 and the outside. The fastening bolt 104 is also inserted into the slit 107, and the height of the mounting member 101 with respect to the longitudinal axis 13 and the orientation around the longitudinal axis 13 can be adjusted, and the fastening bolt 104 can be adjusted in the adjusted state. Can be fastened and fixed. Note that the folding guide rod 72, the guide rod 52, and the like are also provided so that the height position and orientation thereof can be adjusted by the mounting member 101 with respect to the longitudinal axis 13 of the manufacturing apparatus 10.

  The first to fourth folding rollers 91 on the left and right sides are arranged by arranging the rotation shafts 97, 97, 97, 97 of the first to fourth folding rollers 91, 92, 93, 94 substantially parallel to the transport direction. , 92, 93, 94 are arranged in a direction in which the space between the outer peripheral tangents S, S is narrowed. The first to fourth folding rollers 91, 92, 93, 94 are preferably arranged at the center of the height positions of the guard plates 11R, 12 and the descending inclined portions 71, 71. Alternatively, the folding rollers 91, 92, 93, 94 may be lowered and set to an angle that is one half of the angle of the inclined portion 71 with respect to the horizontal.

  As shown in FIG. 10, a driven sprocket 98 is provided at the upper end of the folding rollers 91, 92, 93, 94, and an endless belt 99 is hung between the driven sprockets 98, 98 adjacent in the conveying direction. The rotating shaft 97 of the first folding roller 91 located on the carry-in side is provided with one sprocket 98, and the other is provided with two sprockets 98. In addition, a rotary drive shaft 111 is provided in the width direction above the carry-out side of the folding portion forming means 70, and a drive sprocket 112 is provided on the rotary drive shaft 111. The drive sprocket 112 and the fourth folding roller 94 Between the driven sprocket 98, an endless belt 113 is hooked. Then, the folding rollers 91, 92, 93, 94 are rotationally driven in the transport direction of the paper tube 5 by the rotational drive of the rotational drive shaft 111. That is, the outer peripheries of the folding rollers 91, 92, 93, 94 in contact with the paper tube 5 rotate so as to move in the transport direction.

  In addition, endless press bands 115, 115 that move along the upper surface of the inner guide plate 11R and the central guide plate 12 on the carry-out side from the descending inclined portion 62 position are provided. , 115 are pressed against the upper surfaces of the inner guide plate 11R and the central guide plate 12 by two press rollers 116, 116 arranged in the transport direction, and the presser band 115 is hooked on the belt wheel 117 of the rotary drive shaft 111. The portion that is in contact with the paper tube 5 is driven so as to move at substantially the same speed as the conveyance speed of the paper tube 5 by the rotation of the rotation drive shaft 111.

  As shown in FIG. 4, an endless belt 85 constituting a part of the conveying means 80 is provided below the end of the bi-folding means 50 and the vicinity of the rotary drive shaft 111. The belt 85 is provided with a clamping portion 86 that clamps the lower inner surface of the conveyance opening of the paper tube 5, and is clamped by the clamping portion 86 until the end of the bi-folding means 50 and the rotation drive shaft 1111. The paper 1 is conveyed. Further, the paper tube that has passed through the folding portion forming means 70 is conveyed by the upper and lower drive rollers 87 constituting the conveying means 80 or the like.

  The flat paper tube 5 is continuously conveyed by the holding part 86 of the conveying means 80 from the carry-out side of the folding means 50 to the carry-out side of the folding part forming means 70. Passing under the guide plate 11R and the center side guide plate 12, the upper side where two sheets overlap is ascended and guided to the inclined portion 62, and the opening K at the end in the lengthwise direction extends from the leading end side of the paper tube 5 to the horizontal. At the position of the portion 63, as shown in FIG. 2 (A), the opening K spreads substantially corresponding to the interval between the folding line 2A and the folding line 2C, and the bending lines 2b and 3b are formed by the curved portions 74 and 74. Next, the folding lines 2b and 3b are gradually folded inward by the folding rollers 91, 92, 93, and 94, which are pushed inward and the intervals are gradually narrowed and the thickness is reduced. As a result, the space between the upper inclined portion 71 and the lower guide plates 11R and 12 is narrowed, so that the folding portions 2 and 3 are formed on both sides of the paper tube 5. Further, the formed folding portions 2 and 3 are sandwiched from above and below by the presser bands 115 and 115 and the guide plates 11R and 12, so that each line 2A, 2B, 2C, 3A, 3B, 3C is securely folded.

  Thus, in this embodiment, corresponding to claim 1, the sheet 1 for a paper bag is folded in half in the width direction from the center, and both end edges F1, F1 of the sheet 1 folded in half are folded. In the folding method of the paper bag paper tube in which F2 is bonded and the paper tube 5 having the M-shaped folding portions 2 and 3 is formed on both sides, before the M-shaped folding portions 2 and 3 are formed, the sheet The paper 1 is folded in half in the width direction from the center portion, and both ends F1 and F2 in the width direction are bonded to form a flat paper tube 5, and then M-shaped folds are formed on both sides of the paper tube 5 in the width direction. Since the portions 2 and 3 are formed, before the M-shaped folded portions 2 and 3 are formed, the edge portions F1 and F2 in the width direction folded in two are overlapped and bonded together. The edge portions F1 and F2 in the length direction of each other are properly aligned and the edge portions F1 and F2 are bonded together. It can be.

  Then, only one of the lines 2A, 2B, 2C of the folding part 2 and only one of the lines 3A, 3B, 3C of the folding part 3 corresponding thereto are folded, and both end edges F1, F2 are After forming the paper tube 5 by gluing, the other lines are folded to form the M-shaped folds 2 and 3, so compared to the conventional method of folding the 6 lines and forming the paper tube Thus, the lengthwise edge portions F1 and F2 can be correctly aligned.

  In this way, in the present embodiment, corresponding to claim 2, the M-shaped folding portions 2 and 3 are formed by folding lines 2C and 3C, folding lines 2B and 3B, and folding line 2A that are substantially parallel to each other. , 3A, M-shaped folds 2, 3 are formed from fold lines 2C, 3C, fold lines 2B, 3B, and fold lines 2A, 3A.

  Thus, in this embodiment, corresponding to claim 3, in the manufacturing apparatus used for the method for manufacturing a paper bag paper tube according to claim 1 or 2, one end edge F1 of the sheet 1 before folding is The folding line forming means 30 for forming two folding lines 2a, 2c, 3a, 3c parallel to the central part, and the widthwise both ends F1, by folding the sheet 1 in two in the width direction from the central part A cylindrical forming means 60 that expands the flat paper cylinder 5 bonded with F2 into a cylindrical shape while being conveyed, and an M-shaped folding part by folding the folding lines 2a, 2c, 3a, 3c in conjunction with the conveying operation. 2 and 3 are formed, and before forming the M-shaped folds 2 and 3, the edge portions F1 and F2 are bonded to each other before the M-shaped folds 2 and 3 are formed. The flat paper cylinder 5 is formed into a cylindrical shape by the cylindrical forming means 60, and the cylindrical paper cylinder 5 is conveyed while being conveyed. It is possible to form the folded portions 2 and 3 on both sides of the paper tube 5 by folding part forming means 70.

  In addition, as an effect on the embodiment, the M-shaped folds 2 and 3 are formed of fold lines 2C and 3C, fold lines 2B and 3B, and fold lines 2A and 3A, which are arranged in parallel from the end side. In other words, it has a fold line 2C, a fold line 2B, and a fold line 2A that are arranged substantially parallel to each other from the one end edge F1 side, and are folded substantially parallel to each other from the other end edge F2 side. A fold line 3C, a fold line 3B, and a fold line 3A are formed. A fold line 2A that is one of the one end edge F1 and a fold line 2C is formed, and a fold line 3A and a fold line are formed in the center. Since the sheet 1 is folded in two from the folding line 3C which is the other side of the line 3C, the outer surface side of the end portion from the position of the folding line 2C of the one end edge portion F1 and the inner surface side of the end portion of the other end edge portion F2 Can be overlapped, and the edge portions F1 and F2 can be bonded together by pasting one of them in advance.

  Further, as an effect of the embodiment, two folding lines 2a, 2c and folding lines 3a, 3c parallel to the one end edge F1 and the center of the sheet 1 are formed, and these folding lines 2a, 2c, 3a are formed. , 3c is folded to form fold lines 2C, 3C and fold lines 2A, 3A of the M-shaped folds 2, 3, and by folding along the fold lines 2a, 2c, 3a, 3c The folding lines 2C and 3C and the folding lines 2A and 3A of the folding parts 2 and 3 can be smoothly folded.

  Further, as an effect of the embodiment, the folding lines 2b and 3b are pushed inward by the curved portions 74 and 74, and then the folding rollers 91, 92, 93, in which the interval is gradually narrowed and the thickness is reduced. By 94, the folding parts 2 and 3 can be stably folded, and damages such as tears and tearing of the bag paper 1 can be suppressed. In addition, the positions and angles of the curved portions 74 and 74 and the insertion rollers 91, 92, 93, and 94 can be adjusted by the mounting member, so that the positions and angles can be adjusted according to various paper tube shapes. Adjustable and usable.

  FIG. 12 shows a second embodiment of the present invention. The same reference numerals are given to the same parts as those in the first embodiment, and detailed description thereof is omitted. In this example, the crease forming means 30 includes: This is an example in which the folding lines 2B and 3B are formed by the folding portion forming means 70 without forming the folding lines 2b and 3b, but forming the folding lines 2a and 2c and the folding lines 3a and 3c of the sheet 1. The folding part forming means including the descending slope part 71 and the folding rollers 91, 92, 93, 94 of the present invention corresponds to the folding lines 2A, 3A and the folding lines 2C, 3C on both sides even without a folding line. Thus, the folded lines 2B and 3B can be formed.

  FIG. 13 shows a third embodiment of the present invention. The same reference numerals are given to the same parts as those in the first embodiment, and detailed description thereof will be omitted. In this example, the two-folding means 50 has one The side edge F1 is folded back from the folding line 2c to form the folding line 2C, the other side edge F2 is folded from the central folding line 3a to the front side to form the folding line 3A, and the edge F1, F2 is superposed and pasted.

  As described above, this embodiment also has the same operation and effect corresponding to each of the above embodiments, and in this embodiment, the M-shaped folding portions 2 and 3 are formed from the end side. Folding lines 2C and 3C, folding lines 2B and 3B, and folding lines 2A and 3A that are parallel to each other side by side, and are one of folding lines 2A and folding lines 2C at one end edge F1 2C is formed, and the sheet 1 is folded in two from the fold line 3A which is the other of the fold line 3A and the fold line 3C, so that the outer surface of the end portion from the position of the fold line 2C of the one end edge F1 The side and the inner surface side of the end of the other end edge portion F2 can be overlapped, and the end edge portions F1 and F2 can be bonded together by pasting one of them in advance.

  FIG. 14 shows a fourth embodiment of the present invention. The same reference numerals are given to the same portions as those of the above-described embodiments, and detailed description thereof will be omitted. In this example, one end edge F1 side is folded. Fold inward from the fold 2b forming the line 2B, and fold the sheet 1 in two by folding the other end F2 side inward from the fold 3b forming the central folding line 3B. The edge portions F1 and F2 are overlapped and glued to form a flat paper tube 5.

  After that, the flat paper tube 5 is shown in FIG. 2 while being continuously conveyed from the carry-out side of the bi-folding means 50 to the carry-out side of the folding portion forming means 70 as in the first embodiment. Thus, the opening K is widened, and thereafter, the lines 2A, 2B, 2C, 3A, 3B, and 3C of the folding portions 2 and 3 are folded to form the M-shaped folding portions 2 and 3. In this example, the sheet 1 is folded inwardly on the outer surface side at the folding lines 2B and 3B to form a flat paper tube 5, and then conversely folded on the inner surface side. Thus, the return lines 2B and 3B of the folding parts 2 and 3 are formed.

  As described above, in this embodiment, the same actions and effects as those in the above-described claims are achieved in correspondence with the claims, and in this example, the M-shaped folding portions 2 and 3 are arranged from the end side. The folding lines 2C and 3C, the folding lines 2B and 3B, and the folding lines 2A and 3A, and the sheet 1 is folded inward from the folding line 2B of the edge F1. Since the sheet 1 is folded inward from the folding line 3B at the center, the outer surface side of the end from the position of the folding line 2C of the one end F1 and the end of the other end F2 The edge portions F1 and F2 can be bonded to each other by pasting on one of them in advance.

  FIG. 15 shows a fifth embodiment of the present invention. The same reference numerals are given to the same parts as those in the first embodiment, and the detailed description thereof will be omitted. In this example, FIG. As described above, the folding lines 2a, 2b are provided at one side edge F1 in the width direction of the sheet 1, and the folding lines 3a, 3b, 3c are provided at a substantially central part in the width direction of the sheet 1. The streak 2c is provided at the other end F2 in the width direction of the sheet 1.

  As the sheet 1 is conveyed, the end of the sheet 1 is moved in the conveying direction by the folding means 50 as shown in FIG. The folding line 2A and the folding line 3C are formed by folding in the intersecting direction, and the end edges F1 and F2 are overlapped and glued to form a flat paper tube 5. Therefore, since the edge portions F1 and F2 are glued together in a state where the folding line 2A and the folding line 3C are folded back, it is difficult for the edge portions F1 and F2 to overlap each other in the length direction. Gluing can be performed with the edges in the length direction being aligned.

  After that, the flat paper tube 5 is continuously conveyed from the carry-out side of the bi-folding means 50 to the carry-out side of the folding portion forming means 70 as in the first embodiment, while FIG. As shown in FIG. 3, the opening K is widened, and thereafter, the lines 2A, 2B, 2C, 3A, 3B, and 3C of the folding portions 2 and 3 are folded to form the M-shaped folding portions 2 and 3. .

  As described above, in this embodiment, corresponding to the claims, the same operations and effects as the above-described embodiments are achieved. In this example, an M-shaped folding portion located at the end of the sheet 1 is provided. 2 has a fold line 2B and a fold line 2A that are arranged substantially parallel to each other at one end edge F1, and has a fold line 2C at the other end edge F2. The M-shaped folding part 3 of the part has a folding line 3C, a folding line 3B, and a folding line 3A that are arranged in parallel from the other end side, and form a folding line 2A of one end edge F1. In addition, since the sheet 1 is folded in two from the fold line 3C in the center, the outer surface side of the end portion from the position of the fold line 2A of the one end edge portion F1, and the inner surface side of the end portion of the other end edge portion F2 The edge portions F1 and F2 can be bonded together by pasting on one of them in advance.

  Moreover, since the other side edge part F2 is hidden inside the folding part 2, the design property of the paper cylinder 5 improves. In addition, the other side edge part F2 should just be between the one side edge part F1 and the folding line 2B, and it is preferable to arrange | position in the position which overlaps with the folding line 2B.

  FIG. 16 shows a sixth embodiment of the present invention. The same reference numerals are given to the same parts as those of the above-described embodiments, and detailed description thereof will be omitted. In this example, the folding lines 2b and 3b are formed. The fold line forming means 30 forms the fold lines 2a and 2c and the fold lines 3a and 3c of the sheet 1, and the fold lines 2b and 3b are the same as those of the above-described embodiment 6 except that they are different. Is the example in which the folding lines 2B and 3B are formed by the folding portion forming means 70 without being formed. In the folding portion forming means having the descending inclined portion 71 and the folding rollers 91, 92, 93, 94, etc. of the present invention, Even if there is no folding line, the folding lines 2B and 3B can be formed corresponding to the folding lines 2A and 3A and the folding lines 2C and 3C on both sides.

  FIG. 17 shows a seventh embodiment of the present invention. The same reference numerals are given to the same portions as those of the above-described embodiments, and detailed description thereof will be omitted. In this example, FIG. In the same manner as in the fifth embodiment, the folding lines 2a and 2b are provided at one side edge F1 in the width direction of the sheet 1, and the folding lines 3a, 3b and 3c are substantially in the width direction of the sheet 1. The folding line 2c is provided at the other end F2 in the width direction of the sheet 1.

  As the sheet 1 is conveyed, the end of the sheet 1 is moved in the conveying direction by the folding means 50 as shown in FIG. The folded line 2B and the folded line 3B are formed by folding in the intersecting direction, and the end edges F1 and F2 are overlapped and glued to form a flat paper tube 5. Therefore, since the edge portions F1 and F2 are glued together in a state where the folding line 2B and the folding line 3B are folded back, it is difficult for the edge portions F1 and F2 to overlap each other in the length direction. Gluing can be performed with the edges in the length direction being aligned.

  In this example, the sheet 1 is folded inwardly on the outer surface side at the folding lines 2B and 3B to form a flat paper tube 5, and then conversely folded on the inner surface side. Thus, the return lines 2B and 3B of the folding parts 2 and 3 are formed.

  As described above, in this embodiment, the same actions and effects as those in the above-described claims are achieved in correspondence with the claims, and in this example, the M-shaped folding portions 2 and 3 are arranged from the end side. The folding lines 2C and 3C, the folding lines 2B and 3B, and the folding lines 2A and 3A, and the sheet 1 is folded inward from the folding line 2B of the edge F1. Since the sheet 1 is folded inward from the folding line 3B at the center, the outer surface side of the end from the position of the folding line 2C of the one end F1 and the end of the other end F2 The edge portions F1 and F2 can be bonded to each other by pasting on one of them in advance.

  As mentioned above, although the present Example was explained in full detail, this invention is not limited to the said Example, A various deformation | transformation implementation is possible within the range of the summary of this invention. For example, various methods and apparatuses can be used as a method for folding a sheet by bi-folding means. For example, any two of six folding lines or four folding lines of a sheet are used. It is possible to form a flat paper tube by folding it at a folding line, and as shown in the embodiment, it is possible to appropriately select a location where six folding lines or four folding lines are provided. The position of both edges in the width direction to be glued can also be appropriately selected as shown in FIG. 2 and FIG. 15 and so on. What is necessary is just to form a part.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows the manufacturing method of Example 1 of this invention, FIG. 1 (A) is the sheet paper which formed the crease, FIG. 1 (C) indicates a flat paper tube. It is a perspective view which shows a manufacturing method same as the above, FIG. 2 (A) shows the paper cylinder expanded in the cylinder shape, and FIG. 2 (B) shows the paper cylinder which formed the folding part on both sides in order of a manufacturing process. It is a top view explaining the positional relationship of a guide board and a sheet same as the above. It is a schematic whole side view of a manufacturing apparatus same as the above. It is a schematic whole side view of a manufacturing apparatus same as the above. FIG. 3 is a front view of the crease forming unit and the pasting unit partially cut in section. It is a perspective view of the principal part of a double folding means same as the above. It is a top view of a cylindrical formation means and a folding part formation means same as the above. It is a plane enlarged view of an attachment member same as the above. It is a side view of a folding roller same as the above. It is a side view of a cylindrical formation means and a folding part formation means same as the above. It is a perspective view which shows the manufacturing method of Example 2 of this invention, and in order of a manufacturing process, FIG. 12 (A) is a paper cylinder which expanded in the cylinder shape, FIG. 12 (B) is a paper cylinder which formed the folding part on both sides. Show. FIG. 9 is a perspective view of a paper cylinder expanded into a cylindrical shape, showing a manufacturing method of Example 3 of the present invention. FIG. 14A is a perspective view illustrating a manufacturing method according to a fourth embodiment of the present invention, and FIG. 14A is a sheet having a folding line, FIG. 14B is a folded sheet, FIG. 14 (C) shows a flat paper tube. It is a perspective view which shows the manufacturing method of Example 5 of this invention, FIG.15 (A) is the sheet paper which formed the crease, FIG.15 (B) is a flat paper cylinder, FIG. ) Shows a perspective view of a paper tube expanded in a cylindrical shape. It is a perspective view which shows the manufacturing method of Example 6 of this invention, FIG.16 (A) is the sheet paper which formed the crease, FIG.16 (B) is a flat paper tube, FIG.16 (C) in order of a manufacturing process. ) Shows a perspective view of a paper tube expanded in a cylindrical shape. It is a perspective view which shows the manufacturing method of Example 7 of this invention, FIG. 17 (A) is the sheet paper which formed the crease, FIG. 17 (B) is a flat paper cylinder, FIG. ) Shows a perspective view of a paper tube expanded in a cylindrical shape. It is a perspective view which shows the conventional manufacturing method, FIG.18 (A) shows the sheet | seat in which the crease was formed, and FIG.18 (B) shows the process of forming a folding part in order of a manufacturing process. It is a perspective view which shows the conventional manufacturing method, and FIG. 19 (A) shows the paper cylinder which formed the process which folds the sheet | seat in which the folding part was formed in two, and the folding part in both sides in order of a manufacturing process.

Explanation of symbols

1 sheet of paper (bag paper)
2 Folding part 2a Folding line 2b Folding line 2c Folding line 2B Folding line 2C Folding line 3 Folding part 3a Folding part 3b Folding line 3c Folding line 3B Folding line 3C Folding line 5 Paper tube
10 Production equipment
20 Paper source
30 Folding line forming means
40 Gluing means
50 Folding means
60 Tube forming means
70 Folding part forming means
80 Transport means

Claims (3)

Fold the sheet for paper bags in the width direction from the center, fold the two folded edges together, and form a paper tube with M-shaped folds on both sides In the folding method of the paper bag paper tube, before forming the M-shaped folding part, the sheet is folded in half in the width direction from the center part, and the both edges in the width direction are bonded together to form the paper cylinder. A method for manufacturing a paper bag paper tube, comprising forming the M-shaped folds on both sides of the paper tube in the width direction. 2. The method for manufacturing a paper bag paper tube according to claim 1, wherein the M-shaped folding part has a folding line, a folding line, and a folding line that are substantially parallel to each other. The manufacturing apparatus used for the manufacturing method of the paper bag paper tube of Claim 1 or 2 WHEREIN: The folding line formation means which forms a folding line in the one end edge and center part of the sheet before bi-folding, and the said sheet is said A paper tube that is folded in half in the width direction from the center and bonded to both ends in the width direction is formed into a cylindrical shape while being conveyed, and a folding means is folded in conjunction with the conveying operation. An apparatus for manufacturing a paper bag paper tube, comprising: a folded portion forming means for forming the M-shaped folded portion.

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