JP2004338417A - Device for producing bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for producing a bag capable of producing automatically a plastic bag in which bodies 3a and 3b, body gussets 4a and 4b, bottom bodies 6a and 6b and bottom gussets 7a and 7b are formed of a body material 1 and a bottom material 2. <P>SOLUTION: The upper layer of a body and both layers of a body gusset are continuously cut by a cutter 17 at every intermittent feed of a body material, whereby an open-cut part of the body material is formed, and further at every intermittent feed of the body material, the bottom material is inserted between both layers of the body in the open-cut part of the body material, one layer of both layers of the bottom gussets is inserted together with one layer of the bottom bodies between one layer of the body gusset and one layer of the body, and the other layer of both layers of the body is inserted together with the other layer of the bottom bodies between the other layer of the body gusset and the other layer of the body. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a bag making machine for producing plastic bags.

  Several types of square-bottomed plastic bags with a rectangular bottom surface have been used so far, but recently plastic bags with radical improvements have been devised and proposed. . FIG. 10 shows the plastic bag. This plastic bag is composed of a trunk 1 and a bottom 2, and as shown in FIG. 11, the trunk 1 has rectangular trunk bodies 3a, 3b superposed in two layers. Further, a pair of trunk gusset portions 4a and 4b are formed along both side edges of the trunk body, and the trunk gusset portions 4a and 4b are continuous with both side edges of the trunk body and are folded between both layers 3a and 3b of the trunk body. Folded in two and superimposed on two layers. The fold line 5 extends in the length direction of the body 1.

  On the other hand, the bottom member 2 has a length corresponding to the width of the body member 1, and has two bottom bodies 6a and 6b that are folded in two along the longitudinal center line and overlapped in two layers. Further, a pair of bottom gusset portions 7a, 7b are formed at both ends of the bottom main bodies 6a, 6b. The bottom gusset portions 7a and 7b are folded at an angle α of 45 ° with respect to the folding line 8 of the bottom body 6a and 6b, are continuous with both ends of the bottom body, and are folded between both layers 6a and 6b of the bottom body. It is folded in two layers and the fold line 9 extends at right angles to the fold line 8 of the bottom bodies 6a, 6b. Therefore, the folded lines 10 at an angle of 45 ° are formed at both ends of the bottom bodies 6a, 6b, and the bottom bodies 6a, 6b are trapezoidal, have long sides and short sides, and the long sides are the trunk bodies 3a, 3b. And the short side has a length corresponding to the interval between the two fold lines 5.

  Then, at the bottom edge 11 of the body 1, as shown in FIG. 12, the bottom 2 is inserted between the two layers 3a and 3b of the body. As for the bottom gusset portions 7a and 7b, one layer 7a of both layers is inserted between the one layer 4a of the trunk gusset portion and the one layer 3a of the trunk body together with the one layer 6a of the bottom main body, and the other layer 7b is a bottom layer. It is inserted between the other layer 4b of the trunk gusset and the other layer 3b of the trunk body together with the other layer 6b of the main body. Thereafter, the one layer 6a of the bottom main body and the one layer 3a of the trunk main body are heat-sealed along the bottom edge 11 of the trunk material 1 and joined. Therefore, the heat seal line 12 is formed along the bottom edge 11 of the body material 1. Further, the one layer 7a of the bottom gusset portion and the one layer 4a of the body gusset portion are heat-sealed along the bottom edge 11 of the body material 1 and joined, whereby a heat-sealing line 13 is formed. Similarly, the other layer 7b of the bottom gusset portion and the other layer 4b of the body gusset portion are heat-sealed along the bottom edge 11 of the body material 1 and joined, whereby a heat-sealing line 14 is formed. Further, the other layer 6b of the bottom main body and the other layer 3b of the trunk main body are heat-sealed along the bottom edge 11 of the trunk material 1 and joined, whereby a heat-sealing line 15 is formed.

  In this plastic bag, a laminate film obtained by laminating a sealant on a base material is used as a body material 1 and a bottom material 2. The body material 1 has an outer surface made of a base material such as nylon, It is made of a sealant such as polyethylene and polypropylene. Conversely, for the bottom member 2, the surface facing the body member 1 is made of a sealant such as polyethylene or polypropylene, and the opposite surface is made of a base material such as nylon. Therefore, after the bottom member 2 is inserted, the body member 1 and the bottom member 2 are sandwiched between the heat seal bar and the rubber base, and the body member 1 and the bottom member 2 are heated and pressurized by the heat seal bar. The layers 6a and 6b and the two layers 3a and 3b of the trunk main body can be heat-sealed, and the two layers 7a and 7b of the bottom gusset part and the two layers 4a and 4b of the trunk gusset part can be heat-sealed. The two layers 6a and 6b of the bottom body are not heat-sealed to each other, and the two layers 6a and 6b of the bottom body and the two layers 7a and 7b of the bottom gusset portion are not heat-sealed to each other. The two layers 4a and 4b of the body gusset are not heat-sealed to each other.

  Thus, the plastic bag shown in FIG. 10 is obtained. Therefore, when the body 1 is expanded by the body gussets 4a and 4b, the bottom 2 is expanded by the bottom gussets 7a and 7b, and the bottom 2 forms a rectangular bottom surface. On the bottom surface, the heat-sealing lines 12, 13, 14, 15 extend along four sides of the bottom surface, and the two-fold lines 8, 9 are arranged at the center of the bottom surface. Therefore, the bottom surface of the plastic bag is completely rectangular and can be stably stood upright. The upright plastic bag will not accidentally fall.

  In the case of this plastic bag, the body 1 and the bottom 2 form the body 3a, 3b, the body gussets 4a, 4b, the bottom body 6a, 6b, and the bottom gussets 7a, 7b, which are stably upright. Can be convenient and marketable. However, at present, it is difficult to automatically produce this plastic bag, and there is a strong demand for the development of a bag making machine that achieves this.

  Accordingly, an object of the present invention is to automatically manufacture a plastic bag in which a trunk body, a trunk gusset portion, a bottom body, and a bottom gusset portion are formed by a trunk material and a bottom material in a bag making machine for producing a plastic bag. It was done as.

According to the present invention, the torso comprises a torso and a bottom, and the torso is formed along a rectangular torso body superimposed on two layers and both side edges of the torso body. A pair of body gussets that are continuous, folded between both layers of the body, folded in two, and superimposed in two layers, wherein the bottom material is folded in two along a longitudinal centerline, and two layers Formed at both ends of the bottom body, and folded at an angle of 45 ° with respect to a folding line of the bottom body, continuous with both ends of the bottom body, between both ends of the bottom body. It has a pair of bottom gussets that are folded, folded in two, and superimposed on two layers. At the bottom edge of the body, the bottom is inserted between both layers of the body, Of the layers, one layer together with one layer of the bottom main body has the body gasket. Manufacturing a plastic bag inserted between one layer of the torso part and one layer of the trunk body, and another layer is inserted between the other layer of the trunk gusset part and the other layer of the trunk body together with the other layer of the bottom body. A bag making machine,
An intermittent feed mechanism that intermittently feeds the continuous trunk material having the continuous trunk body and the trunk gusset portion continuous in the length direction by a constant length in the length direction;
A cutter provided in a feed path of the body material, cutting a continuous upper layer of the body body and both layers of the body gusset portion each time the body material is intermittently fed, thereby forming a cutout portion of the body material When,
Provided at a downstream position of the cutter, for each intermittent feed of the body material, at the cutout portion of the body material, insert the bottom material between both layers of the body body, of the two layers of the bottom gusset portion, One layer is inserted between one layer of the trunk gusset part and one layer of the trunk body together with one layer of the bottom main body, and another layer is formed of the other layer of the trunk gusset part and the trunk body together with the other layer of the bottom main body. Means for inserting between other layers;
After the bottom material is inserted, each time the body material is intermittently fed, both layers of the bottom body and both layers of the body body are heat-sealed, and both layers of the bottom gusset portion and both layers of the body gusset portion are separated. And a means for heat sealing.

  Hereinafter, embodiments of the present invention will be described.

  In FIG. 1, this is a bag making machine according to the present invention, which uses a continuous body material 1 having continuous body bodies 3a, 3b and body gusset portions 4a, 4b that are continuous in the length direction. For manufacturing plastic bags. The trunk material 1 is made of a plastic film, and its trunk bodies 3a and 3b are superposed in two layers, and the trunk gusset portions 4a and 4b are formed along both side edges of the trunk body and are continuous with both side edges of the trunk body. It is folded between both layers 3a and 3b of the main body, folded in two, and superimposed on two layers. As for the continuous trunk gusset portions 4a and 4b, the continuous trunk material 1 may be appropriately bent and heat-sealed to form the trunk main bodies 3a and 3b and the trunk gusset portions 4a and 4b. Gusset parts 4a and 4b may be formed, inserted between both layers 3a and 3b of the trunk body, and both may be heat-sealed along both side edges of the trunk body.

  In this bag making machine, a pair of feed rollers 16 is used for a feed mechanism of the body 1, a continuous body 1 is guided between the respective feed rollers 16, the feed rollers 16 are driven by a drive motor, and rotated. A continuous body material 1 is intermittently fed by a fixed length in the continuous direction. Further, a cutter 17 is provided in the feed path of the body 1, and the continuous body 1 is guided to the cutter 17 through the dancer roller 18, and every time the body 1 is intermittently fed, the cutter 17 provides an upper layer of the continuous body. 3a and both layers 4a, 4b of the body gusset are cut, whereby a cutout 17 'of the body 1 is formed. For example, as shown in FIG. 2, a Thomson blade is used for the cutter 17, and a cutting blade 19 is attached to a plywood 20, which descends toward a pedestal 21, and the cutting blade 19 causes the upper layer 3 a and the continuous body main body 3. Both layers 4a and 4b of the body gusset are cut. As a result, the cutout 17 'of the body 1 is formed. Further, at both ends of the cutting blade 19, metal adjusters 22 are provided on the pedestal 21. Its thickness corresponds to the thickness of the lower layer 3b of the continuous barrel body. Accordingly, the cutting blade 19 comes into contact with the adjuster 22, and the cutting blade 19 cuts the continuous upper body layer 3a and both layers 4a and 4b of the gusset portion, but does not cut the continuous lower trunk layer 3b. The cutting blade 19 is lowered toward the receiving table 21 and stopped at a predetermined position. When the cutting blade 19 stops, the interval between the cutting blade 19 and the receiving table 21 corresponds to the thickness of the lower layer 3b of the continuous body. Is also good. Thus, the upper layer 3a of the continuous body and both layers 4a and 4b of the gusset portion are cut, and the lower layer 3b of the continuous body is not cut. In this case, it is not necessary to provide the adjuster 22 specially. Therefore, when the feed roller 16 is rotated thereafter, the body material 1 can be intermittently fed by the continuous lower layer 3b of the body.

  Further, the bag making machine has a folding forming mechanism for the bottom material 2. In this embodiment, a heater or a press 23 is used in the folding forming mechanism, and a continuous bottom material 2 continuous in the width direction is supplied from a raw material 24, passes through dancer rollers 25, and is connected to the heater or the press 23 and the pedestal. Guided between 26. The heater or press 23 has an elongated edge, the edge facing the base 2 and the cradle 26. Further, the bottom material 2 is guided between a pair of feed rollers 27, and the feed roller 27 is driven and rotated by a driving motor, and the continuous bottom material 2 is intermittently fed by a certain length in the continuous direction. The heater or press 23 and the pedestal 26 are driven and moved by a drive mechanism such as a cylinder at each intermittent feed of the cylinder 2, and the continuous bottom material 2 is sandwiched between the heater or the press 23 and the pedestal 26, 23 edges are pressed against the bottom material 2. Therefore, in the case of the heater 23, the bottom member 2 is heated and pressed by the edge thereof, and the bottom member 2 is folded. In the case of a press, the bottom material 2 is pressed by the edge, and a fold is formed in the bottom material 2. Regarding the shape and length of the edge of the heater or press 23, the shape and length of the edge are appropriately selected in the bottom main bodies 6a and 6b and the bottom gusset portions 7a and 7b of the bottom member 2 based on the size. The edge extends along the folding line 8 of the bottom bodies 6a, 6b and extends along the folding line 10 of the bottom gussets 7a, 7b. Therefore, as shown in FIG. 3, the bottom body 6a, 6b and the bottom gusset portions 7a, 7b of the bottom member 2 are formed along the folding line 8 of the bottom body 6a, 6b, and the bottom gusset portion 7a , 7b along the folding line 10 are formed.

  Further, a cutter 28 and a holder 29 are arranged below the feed roller 27, and after forming the folded portion, the feeder 27 intermittently feeds the base material 2, and the base material 2 is inserted into the holder 29, Each time the material 2 is intermittently fed, the bottom material 2 is cut by the cutter 28. The position is between the continuous bottom members 2, and the bottom members 2 are cut along the cutting line 30. Therefore, the cut bottom material 2 falls into the holder 29 and is held. The holder 29 has a channel shape for holding three sides of the bottom member 2. Further, in this embodiment, the bottom material 2 is punched out by a punch simultaneously with the formation of the folded shape or the cutting of the bottom material 2, and cutouts 31 are formed at both ends between the bottom materials 2.

  Further, in this bag making machine, the spatula 32 is provided at the downstream position of the cutter 17, and after the formation of the fold and the cutting of the bottom material 2, the spatula 32 is pressed against the folding line 8 of the bottom main bodies 6a and 6b, At the cutout 17 'of the material 1, the bottom material 2 is pushed between the two layers 3a, 3b of the trunk body. In this embodiment, at the position downstream of the cutter 17, the continuous body material 1 is guided to the guide roller 33, and each time the body material 1 is intermittently fed, the slit 17 ′ reaches the position of the guide roller 33, The body material 1 is curved by 33, and the slit 17 'is opened. Its position corresponds to the bottom 2 of the holder 29, which faces the open cutout 17 '. When the cutout portion 17 'is opened, the upper layer 3a of the trunk main body may be sucked and lifted by the suction pad, and the cutout portion 17' may be reliably opened. An air jet may be blown toward the slit 17 'to ensure that the slit 17' is opened. The spatula 32 is operated and moved by an operating mechanism such as a cylinder on the opposite side of the cutout 17 ′, and is pressed against the folding line 8 of the bottom main bodies 6 a and 6 b, and the bottom material 2 is pushed out of the holder 29. , Is pushed between the two layers 3a and 3b of the trunk body through the opened cutout 17 '.

  Further, a guide member 34 is arranged between the holder 29 and the guide roller 33, and when the bottom material 2 is pushed in by the spatula 32, it is guided by the guide member 34, and the bottom main bodies 6a and 6b are folded along the folding line 8 thereof. The bottom gusset portions 7a and 7b are folded back along the folding line 10, and the bottom gusset portions 7a and 7b are folded between both layers 6a and 6b of the bottom main body and folded in half. For example, a pair of guide plates 34 is used as a guide member, each guide plate 34 is arranged at an interval in the up-down direction, opens toward the bottom 2 of the holder 29, and the spatula 32 and the bottom 2 are It is pushed between the guide plates 34, whereby the bottom main bodies 6a, 6b are folded in two, and the bottom gusset portions 7a, 7b are folded back. Then, the bottom main bodies 6a, 6b and the bottom gusset portions 7a, 7b are pushed between the two layers 3a, 3b of the trunk main body. Further, in this embodiment, as shown in FIGS. 4 and 5, a pair of fins 35 are arranged between the guide plates 34, and first, the bottom main bodies 6a, 6b are pushed between the guide plates 34, Thereby, the bottom main bodies 6a and 6b are folded in two. Thereafter, the bottom gusset portions 7a and 7b engage with the respective fins 35 and are pushed between the respective guide plates 34, and the bottom gusset portions 7a and 7b are folded by the fins 35 and the guide plates 34, folded and folded in two. . Therefore, the bottom gusset portions 7a and 7b can be reliably folded back, folded, and folded in two.

  Further, in this embodiment, as shown in FIG. 6, when the bottom main bodies 6a and 6b are folded in two and the bottom gusset portions 7a and 7b are folded back, the notch 31 forms the extension 36 of the bottom material 2; When the bottom material 2 is pushed in by the spatula 32 in the cutout 17 'of the trunk 1, its extension 36 is also pushed between the two layers 3a, 3b of the trunk main body. Further, an ultrasonic sealing device or a heat sealing device 37 is disposed above the guide roller 33, and after the bottom member 2 is pushed in, for example, at a plurality of places 38 of the extension portion 36 of the bottom member 2, The body material 1 and the bottom material 2 are ultrasonically or heat-sealed by the heat sealing device 37 and temporarily fixed.

  Further, the heat seal bar 39 and the rubber base 40 are arranged on the feed path of the body material 1. After temporarily fixing the body material 1 and the bottom material 2, the material is intermittently fed by the feed roller 16. The heat seal bar 39 and the rubber base 40 are driven by the operating mechanism, and are lowered and raised, so that the body 1 and the bottom 2 are sandwiched between the heat seal bar 39 and the rubber base 40, and the area of the extension 36 of the bottom 2 , The body material 1 and the bottom material 2 are heated and pressurized by the heat seal bar 39, the two layers 6a, 6b of the bottom body and the two layers 3a, 3b of the body are heat sealed, and both the layers 7a of the bottom gusset portion. , 7b and both layers 4a, 4b of the body gusset portion are heat-sealed. Instead of the heat seal bar 39 and the rubber base 40, the body member 1 and the bottom member 2 may be sandwiched between a pair of heat seal bars, and the body member 1 and the bottom member 2 may be heated and pressurized to perform heat sealing. Further, the cutter 41 is arranged in the feed path of the body material 1, and after the heat sealing, the lower layer 3 b of the body body is cut by the cutter 41 at the cutoff portion 17 ′ of the body material 1 every time the body material 1 is intermittently fed. Is done. Therefore, the bottom edge 11 of the body 1 is formed by the cut-off portion 17 'of the body 1, whereby the plastic bag of FIG. 10 is manufactured.

  In the case of this bag making machine, it is necessary to cut the upper layer 3a of the trunk main body and both layers 4a and 4b of the trunk gusset portion with the cutter 17 and then cut the lower layer 3b of the trunk main body with the cutter 41. After cutting the upper layer 3a of the main body and both layers 4a and 4b of the trunk gusset portion, it is difficult to accurately cut the lower layer 3b of the trunk main body at the cutting position. Therefore, it is possible to drive the cutter 41 twice to cut both the layers 3a and 3b of the trunk main body, both the layers 4a and 4b of the trunk gusset portion and the extension 36 of the bottom member 2 on both sides of the cutting position of the cutter 17. preferable. For example, first, both layers 3a and 3b of the trunk main body, both layers 4a and 4b of the trunk gusset portion, and the extension 36 of the bottom member 2 are cut slightly downstream of the cutting position of the cutter 17, and then the cutter 41 is cut. The two layers 3a and 3b of the trunk main body and both layers 4a and 4b of the trunk gusset part may be cut slightly upstream of the cutting position of the cutter 17 by slightly moving the trunk material 1 in a direction opposite to the feed direction. . Instead of slightly moving the cutter 41 in the direction opposite to the feed direction of the body 1, the continuous body 1 may be slightly fed in the feed direction. The cutter 41 is provided with two cutting edges, each cutting edge is formed at an interval in the feed direction of the body material 1, and on both sides of the cutting position of the cutter 17, both layers 3a and 3b of the body main body and the body gusset portion are formed. Both the layers 4a, 4b and the extension 36 of the bottom material 2 may be cut with a constant width.

  In forming the folded bottom material 2, as shown in FIGS. 7 and 8, a continuous bottom material 2 is sandwiched between the heater or press 23 and the receiving base 26 to form a folded shape in two stages. In the first stage, a fold is formed along the folding line 8 of the bottom main bodies 6a, 6b, a fold is formed along the folding line 10 of the bottom gusset portions 7a, 7b, and the folding line 8 and the folding line are formed. 10 is folded in the same direction. Thereafter, in the second stage, the folding may be formed along the folding line 9 of the bottom gusset portions 7a and 7b, and the folding line 9 may be folded in the opposite direction. In this case, the bottom gusset portions 7a and 7b can be easily folded back, folded, and folded in two, which is preferable.

  As shown in FIG. 9, the bottom material 2 is pushed between the two layers 3 a and 3 b of the trunk body at the cutout 17 ′ of the trunk material 1 without forming the extension 36 of the bottom material 2, and the body material 1 is separated. At a plurality of locations 38 near the portion 17 ', the body member 1 and the bottom member 2 may be ultrasonically or heat-sealed with an ultrasonic sealing device or a heat sealing device 37 and temporarily fixed. Further, when the lower layer 3b of the trunk body is cut by the cutter 41 at the cutout portion 17 'of the trunk material 1, the bottom edge 11 of the trunk material 1 is formed by the cutout portion 17' of the trunk material 1, whereby the plastic shown in FIG. Bags can be manufactured. As in the embodiment of FIG. 1, in the embodiment of FIG. 9, the cutter 41 is driven twice, and both layers 3a and 3b of the trunk main body and both layers 4a and 4b of the trunk gusset portion are provided on both sides of the cutting position of the cutter 17. Is preferably cut.

  As described above, according to the present invention, in a bag making machine for producing a plastic bag, in the bag making machine, the body 1 and the bottom 2 are used to form the body 3a, 3b, the body gussets 4a, 4b, the body 6a, 6b, and the bottom. The plastic bag in which the gusset portions 7a and 7b are formed can be manufactured automatically, and the intended purpose can be achieved.

It is a side view which shows the Example of this invention. It is a front view of the cutter of FIG. It is a perspective view of the holder of FIG. It is a front view of the guide of FIG. FIG. 5 is a plan view of the guide of FIG. 4. It is explanatory drawing which shows the state which the bottom material of FIG. 1 was pushed into the bottom edge of the trunk | drum. It is a side view showing other examples. It is a perspective view of the holder of FIG. It is explanatory drawing which shows another Example. It is explanatory drawing of the plastic bag manufactured by the bag making machine of FIG. It is a disassembled perspective view of the trunk | drum and bottom material of FIG. It is a perspective view which shows the state which the bottom material of FIG. 11 was inserted in the bottom edge of the trunk | body material, and was heat-sealed.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Body material 2 Bottom material 3a, 3b Body main body 4a, 4b Body gusset part 6a, 6b Bottom body 7a, 7b Bottom gusset part 8 Folding line 10 Folding line 11 Bottom edge 16 Feed roller 17 Cutter 23 Heater or press 32 Spatula 34 Guide plate

Claims (1)

The body comprises a body and a bottom, and the body is formed along a rectangular body that is superimposed in two layers, and along both sides of the body, and is continuous with both sides of the body. A bottom body that has a pair of body gussets that are folded between the two layers, folded in two, and superimposed in two layers, wherein the bottom material is folded in two along a longitudinal center line, and superimposed in two layers And formed at both ends of the bottom body, folded at an angle of 45 ° with respect to a folding line of the bottom body, continuous with both ends of the bottom body, folded between both ends of the bottom body, and folded in two. Having a pair of bottom gussets superimposed on two layers, wherein at the bottom edge of the body, the bottom is inserted between both layers of the body; Is one layer of the body gusset together with one layer of the bottom body, Is inserted into the piece layers of the body, a bag making machine other layer to produce a plastic bag which is inserted into the other layers of the other layer and the trunk body of the barrel gusset portion together with other layers of the bottom body,
An intermittent feed mechanism that intermittently feeds the continuous trunk material having the continuous trunk body and the trunk gusset portion continuous in the length direction by a constant length in the length direction;
A cutter provided in a feed path of the body material, cutting a continuous upper layer of the body body and both layers of the body gusset portion each time the body material is intermittently fed, thereby forming a cutout portion of the body material When,
Provided at a downstream position of the cutter, for each intermittent feed of the body material, at the cutout portion of the body material, insert the bottom material between both layers of the body body, of the two layers of the bottom gusset portion, One layer is inserted between one layer of the trunk gusset part and one layer of the trunk body together with one layer of the bottom main body, and another layer is formed of the other layer of the trunk gusset part and the trunk body together with the other layer of the bottom main body. Means for inserting between other layers;
After the bottom material is inserted, each time the body material is intermittently fed, both layers of the bottom body and both layers of the body body are heat-sealed, and both layers of the bottom gusset portion and both layers of the body gusset portion are separated. A bag making machine comprising means for heat sealing.

Images