JP2006213011A - Bag making machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bag making machine that enhances sealing precision in case of making a bag by sealing and cutting a laminated synthetic resin sheet, and is small-sized. <P>SOLUTION: The bag making machine has sheet sending-out means 30 and 31, and a pair of rolls 40 and 41 between which a raw material sheet 10 is supplied in the downstream of the sheet sending-out means 30 and 31. A pair of the rolls 40 and 41 are rotatable in the direction opposite to each other to send out the raw material sheet 10 to the downstream. There is mounted in the axial direction on the outer peripheral surface of the roll 40 a heater 42 which can be raised to a temperature of not lower than a melting point of the raw material sheet 10. The raw material sheet 10 is sent out with the sending-out means 30 and 31 in the state that the clearance across a pair of the rolls 40 and 41 is wider than the thickness of the raw material sheet 10. The raw material sheet 10 is melted and cut in the state that a pair of the rolls 40 and 41 are in contact with each other via the raw material sheet 10, and the cut end portions 10b and 15c are sealed by welding. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a bag making machine for manufacturing a bag from a synthetic resin sheet.

  Conventionally, a bag making machine that manufactures a bag with one side opened from a synthetic resin sheet, after forming a folded part in the part that will be the bottom of the bag in the original sheet, It is comprised so that the site | part used as the both ends of a bag may be joined, it may be made into a bag shape, and it may cut | disconnect from a raw fabric sheet.

  At this time, the joining and cutting of the portions which are both ends of the bag are simultaneously performed mainly by a sealing process by a thermal melting method. In particular, when a bubble sheet or a foam sheet is used as the raw fabric sheet, a heat sealing method or an impulse sealing method is used as a sealing process. A bag making machine using these sealing methods includes a feed mechanism that feeds the original sheet, and a seal cutting mechanism that cuts the original sheet simultaneously with the sealing. A pinch roll, a belt, or the like is used as the feeding mechanism, and a predetermined amount of the original fabric sheet is fed to the seal cutting mechanism. The seal cutting mechanism includes a seal bar that generates electricity and generates a cradle, and the seal bar moves up and down so as to sandwich the original sheet, and the original sheet is fused and cut at the same time.

  However, when sealing in a state where the bubble sheet having the bubble portion is folded in half with the bag making machine having the above configuration, the crease is easily opened due to the repulsive force of the bubble sheet when sealing and cutting with the seal bar. There is a problem that accuracy is deteriorated. In particular, the fold is likely to open when the bubble portion is positioned inside the fold.

  Moreover, in the bag making machine using a seal bar, there is a problem that a portion for pressing the original fabric sheet is narrow and it is difficult to securely fix the original fabric sheet, and the sealing accuracy and the sealing strength are lowered. In particular, when sealing a bubble sheet that is not stiff and bulky, the air in the bubble escapes when the bubble sheet is sandwiched, causing a deviation immediately after the bubble sheet is melted, resulting in a variation in seal strength, resulting in an overall seal strength. Decreases.

  In addition, since it is difficult to securely fix the air bubble sheet, it is difficult to perform sealing by narrowing an interval at the time of sealing and cutting, and it is difficult to process a product having a narrow seal width.

  Further, when sealing with a bag making machine using a seal bar, there is a problem that the sealed object melts and adheres to the energized / heated nichrome wire and the peelability of the seal bar is poor. Since this leads to a decrease in quality and causes defective products, a conventional bag making machine is provided with a peeling device for peeling the object to be sealed from the seal bar. However, even when a peeling device is provided, it is difficult to continuously maintain sufficient peelability when sealing with a narrow interval, and the device becomes complicated.

  Furthermore, it is necessary to provide a take-off mechanism such as a belt conveyor for taking out the sealed and cut bag from the seal cutting mechanism on the downstream side of the seal cutting mechanism. In particular, when the bubble portion is located outside the fold line, the bubble portion is easily caught by the seal cutting mechanism, and a take-off mechanism is necessary. Thus, when providing a take-off mechanism, there exists a problem that an apparatus enlarges.

  The present invention has been made in view of the above points, and it is an object of the present invention to improve sealing accuracy and to reduce the size of an apparatus when a bag is manufactured by sealing and cutting stacked synthetic resin sheets.

In order to achieve the above object, according to the first aspect of the present invention, sheet feeding means (30, 31) for feeding the sheets (10) stacked on a plurality of sheets to the downstream side, and sheet feeding means (30, 31). A pair of rolls (40, 41) arranged perpendicular to the flow direction of the sheet (10) on the downstream side of the sheet and arranged parallel to each other so that a plurality of stacked sheets (10) are supplied therebetween And
The pair of rolls (40, 41) can be rotated in opposite directions so as to send a plurality of stacked sheets (10) downstream, and the outer peripheral surface of at least one of the pair of rolls (40) The heating element (42) capable of raising the temperature to the melting point of the sheet (10) or more is provided in the axial direction, and the pair of rolls (40, 41) is a sheet in which a plurality of intervals are overlapped. (10) It is possible to move between a wider state and a state where they are in contact with each other via a plurality of stacked sheets (10), and a pair of rolls (40, 41) overlap each other on a plurality of sheets. The sheet (10) stacked in a plurality of sheets in a state of being wider than the formed sheet (10) is sent downstream by the sheet sending means (30, 31), and the heat generated in one roll (40) Body (42) is the other roll 41), the pair of rolls (40, 41) come into contact with each other via a plurality of stacked sheets (10), and the heating elements (42) overlap each other. The sheet (10) is melted and cut, and the cut ends (10b, 15c) of the sheets (10) stacked on the plurality of sheets are fused and sealed.

  Thus, by sealing and cutting the sheet (10) using a pair of rolls (40, 41), the sheet (10) can be sealed while being pressed by the rolls (40, 41). Thereby, it becomes difficult to shift | deviate the sheet | seat (10) piled up in the case of a seal | sticker, and it can improve a sealing precision.

  Further, after the sheet (10) is sealed and cut, the manufactured bag (15) can be discharged to the downstream side by rotating the rolls (40, 41). Thereby, it is not necessary to provide a take-up mechanism for taking the bag (15) downstream of the mechanism for sealing the sheet (10), and the apparatus can be downsized.

  Further, when the sheet (10) is delivered by the sheet delivery means (30, 31), the roll (40, 41) is rotated so that the sheet (10) can be delivered even when the amount of the sheet (10) is small. Can be performed reliably. Thereby, also when manufacturing a bag (15) with a small opening part (15d), a sheet | seat (10) can be sent out reliably.

  In the invention according to claim 2, the pair of rolls (40, 41) has an elastic member (40b, 41b) provided in a portion excluding a portion corresponding to the heating element (42) on the outer peripheral surface. The elastic members (40b, 41b) are provided at least before and after the position corresponding to the heating element (42) in the rotation direction of the pair of rolls (40, 41). ) Move to contact with each other via the stacked sheets (10), the elastic members (40b, 41b) exist between the rolls (40, 41) and the sheet (10). It is characterized by having.

  Accordingly, the sheet (10) can be pressed and pressed, and the area to be pressed can be increased. Therefore, the sheet (10) can be reliably pressed during sealing, and the sealing accuracy and the sealing strength are improved. be able to.

  In the invention according to claim 3, the elastic member (40b, 41b) is provided on the entire surface excluding the portion corresponding to the heating element (42) on the outer peripheral surface of the pair of rolls (40, 41). It is characterized by that. Thereby, the sheet (10) can be sent out more reliably.

  In the invention according to claim 4, the elastic member (40b, 41b) is thicker than the heating element (42), and a sheet (a pair of rolls (40, 41) is stacked) 10), the elastic members (40b, 41b) are elastically deformed when moved to contact with each other, and the heating element (42) contacts the sheet (10).

  Thereby, since a heat generating body (42) and a sheet | seat (10) can be effectively peeled after sealing, a special peeling apparatus becomes unnecessary and it can attain size reduction of an apparatus.

  Further, as in the case of the invention according to claim 5, even when manufacturing a bubble sheet in which a large number of bubble portions (13) in which a gas is sealed is formed, the sheet is not easily displaced during sealing. , Sealing accuracy can be improved.

  In addition, the code | symbol in the bracket | parenthesis of each said means shows the correspondence with the specific means as described in embodiment mentioned later.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view of a synthetic resin air bubble sheet 10 which is a specific example of a raw sheet processed by the bag making machine of the present invention.

  As shown in FIG. 1, the bubble sheet 10 of the present embodiment includes a concavo-convex sheet (cap film) 11 on which a large number of concavo-convex protrusions are formed, and a flat flat sheet (back film) 12. It has a two-layer structure. In the concavo-convex sheet 10 of this embodiment, a large number of cylindrical protrusions are embossed, and the flat sheet 12 is joined to the protrusion opening side of the concavo-convex sheet 11. As a result, a bubble portion (sealed protrusion) 13 in which air is sealed is formed between the uneven sheet 11 and the flat sheet 12.

In the present embodiment, a polyolefin-based resin such as polyethylene or polypropylene is used as the synthetic resin constituting the bubble sheet 10. In the case where flexibility is required as in the present embodiment, the synthetic resin air bubble sheet 10 desirably has a weight per unit area (weight per unit area) of 35 to 200 g / m ² .

  FIG. 2 is a perspective view showing main components of the bag making machine of the present embodiment. As shown in FIG. 2, the bag making machine includes a triangular plate 20, a pair of feed rolls 30 and 31, and a pair of seal rolls 40 and 41, and manufactures a bag body 15 from the raw fabric sheet 10. The bag body 15 manufactured by the bag making machine according to the present embodiment has the side portions 15b and 15c positioned at both ends of the bent bottom portion 15a fused and sealed, and the side facing the bottom portion 15a. Is an opening 15d.

  The original fabric sheet 10 is supplied to the bag making machine from an original fabric supply unit 14 in which the original fabric sheet 10 is rolled. The triangular plate 20 forms a fold line 10 a in the vicinity of the center in the width direction of the original fabric sheet 10 supplied from the original fabric supply unit 14.

  The feed rolls 30 and 31 pull out the original sheet 10 from the original sheet supply unit 14 and supply the original sheet 10 to the downstream seal rolls 40 and 41. The feed rolls 30 and 31 are provided on the downstream side of the triangular plate 20, and are constituted by a pair of columnar rolls arranged in parallel.

  The feed rolls 30 and 31 of the present embodiment are configured as nip rolls in which a sheet made of a material having a high friction coefficient (for example, rubber) is attached to the surface of a core made of metal or resin.

  The pair of feed rolls 30 and 31 are configured to rotate synchronously in opposite directions with the raw sheet 10 being sandwiched. The feeding rolls 30 and 31 correspond to the sheet feeding means of the present invention.

  The seal rolls 40 and 41 are used for fusing and cutting the folded-back original sheet 10. The seal rolls 40 and 41 are provided on the downstream side of the feed rolls 30 and 31, and are composed of a pair of rolls arranged in parallel. As the seal rolls 40 and 41 of the present embodiment, cylindrical rolls having a diameter larger than that of the feed rolls 30 and 31 are used. The pair of seal rolls 40 and 41 are configured to rotate synchronously in opposite directions.

  FIG. 3 is a cross-sectional view of the seal rolls 40 and 41. As shown in FIG. 3, elastic members 40b and 41b are provided on the outer peripheral surfaces of the metal roll members 40a and 41a. The elastic members 40b and 41b can be made of a material having a high friction coefficient such as rubber and having elasticity.

  On the outer peripheral surface of the first seal roll 40 disposed on the upper side in the drawing, a linear energization heating element 42 that generates heat by energization is provided in the axial direction. The energization heating element 42 is for heating and sealing (thermal fusion) the original sheet 10 to further cut the original sheet 10, and the temperature is raised to a temperature equal to or higher than the melting point of the original sheet 10. be able to. In the present embodiment, a nichrome wire is used as the energization heating element 42, and an impulse seal is used in which the nichrome wire is energized instantaneously to raise the temperature when sealing.

  The elastic members 40b and 41b are provided on almost the entire periphery of the surfaces of the roll members 40a and 41a, that is, on the entire surface excluding a portion corresponding to the energization heating element 42 on the outer surfaces of the pair of roll members 40a and 41a. The elastic member 40b is not provided at the portion of the first roll member 40a where the energization heating element 42 is provided, and the elastic member 41b is also provided at the portion of the second roll member 41a facing the energization heating element 42. It is not done. Further, the elastic members 40 b and 41 b are configured to have a thickness greater than that of the energization heating element 42.

  The first roll 40 is movable in the vertical direction. In a state where the first roll 40 has moved upward, an interval is formed through which the original sheet 10 folded in half with the second sheet roll 41 disposed on the lower side in FIG. 2 can pass. is doing. The first roll 40 moves downward in a state where the energization heating element 42 is located at the lowermost part of the outer peripheral surface.

  Hereinafter, the operation of the bag making machine of this embodiment will be described with reference to FIGS. FIG. 4 is a side view showing the main part of the bag making machine, and (a) to (c) show the manufacturing process of the bag body 15 by the bag making machine. FIG. 5 is an enlarged cross-sectional view of a portion of the seal rolls 40 and 41 that seals the original fabric sheet 10. FIG. 5A shows a state in which the original fabric sheet 10 is held by the seal rolls 40 and 41, and FIG. The state which has sealed the raw fabric sheet | seat 10 is shown. 4 shows a state when the front side is viewed from the back side in FIG. 2, and the right side in the drawing is the upstream side in the sheet flow direction and the left side is the downstream side in the sheet flow direction.

  First, the delivery step shown in FIG. The pair of feed rolls 30 and 31 are operated to feed the original fabric sheet 10 downstream by a predetermined length. At this time, the end 10b on the most downstream side of the original fabric sheet 10 is sealed by the seal rolls 40 and 41 in the previous seal cutting step.

  The feed amount of the original fabric sheet 10 by the feed rolls 30 and 31 is the length of the bottom 15a and the opening 15d of the bag 15 to be manufactured. At this time, when the seal rolls 40 and 41 are rotated, the feeding of the original sheet 10 by the feeding rolls 30 and 31 can be assisted, and the length of the bottom portion 15a of the bag body 15 in which the original sheet 10 is manufactured. It can be sent out reliably. When the original fabric sheet 10 is sent out by the feed rolls 30 and 31, the pair of seal rolls 40 and 41 are also rotated, and the first seal roll 40 is in a state where the energization heating element 42 is located at the lowest position.

  Next, the seal cutting process shown in FIG. The first seal roll 40 is moved downward, and the original sheet 10 is pressed by using the second sheet roll 41 as a cradle.

  Thereby, as shown to Fig.5 (a), the original fabric sheet 10 is pressed down by the elastic members 40b and 41b in the seal rolls 40 and 41. FIG. Then, as shown in FIG. 5B, the elastic members 40 b and 41 b are compressed and deformed (elastically deformed), and the energization heating element 42 comes into contact with the original fabric sheet 10, so that the original fabric sheet 10 folded in half is obtained. Are fused, and sealing and cutting are performed simultaneously. Thereby, the raw fabric sheet 10 is cut into the downstream side and the upstream side of the seal rolls 40 and 41, and the cut end portions 10b and 15c are fused and sealed.

  At this time, the raw fabric sheet 10 is sandwiched between the pair of seal rolls 40 and 41, and the front and back of the sealed portion are pressed by the elastic members 40b and 41b. Since the elastic members 40b and 41b compress and deform and press the original sheet 10, the original sheet 10 is gripped with a necessary and sufficient pressure and the area to be pressed increases, and the original sheet 10 is securely fixed. Can do. Thereby, escape of the original fabric sheet 10 at the time of sealing can be prevented.

  Next, the discharging process shown in FIG. The original fabric sheet 10 on the downstream side of the seal rolls 40 and 41 is separated from the original fabric sheet 10 as a bag 15 by the seal cutting process. After the seal cutting step, the first seal roll 40 moves upward.

  Thereby, while the energization heat generating body 42 leaves | separates from the raw fabric sheet 10, the elastic members 40b and 41b of the seal rolls 40 and 41 are gradually recovered from the compressed and deformed state by releasing the pressurized state. At this time, even after the energization heating element 42 is separated from the original fabric sheet 10, the original fabric sheet 10 is kept pressed by the elastic members 40b and 41b for a while, so that the energization heating element 42 and the original fabric sheet 10 are effective. Can be peeled off.

  And the sealing body 40 and 41 rotate, The bag body 15 isolate | separated from the original fabric sheet 10 is discharged | emitted, and falls below. Although not shown in FIG. 5, a container for storing the bag body 15 is installed on the downstream side of the seal rolls 40 and 41, and the bag body 15 discharged from the seal rolls 40 and 41 is inside the container. It is stored in.

  The bag body 15 manufactured in the above-described process is in a state where the side portions 15b and 15c are sealed. And the edge part 10b of the most downstream side of the original fabric sheet | seat 10 is also sealed, and becomes the downstream side part 15b of the bag body 15 through the next seal cutting process.

  As described above, by using the sealing rolls 40 and 41 that rotate as seal cutting means for sealing and cutting the raw fabric sheet 10, the raw fabric sheet 10 can be sealed while being pressed by the rolls 40 and 41. Thereby, the original fabric sheet 10 superimposed at the time of sealing becomes difficult to shift, and the sealing accuracy can be improved.

  Moreover, the manufactured bag 15 can be discharged | emitted downstream by rotating the seal rolls 40 and 41 after a seal cutting process. Thereby, it is not necessary to provide a take-up mechanism for taking the bag body 15 downstream of the seal cutting mechanism, and the apparatus can be downsized.

  Further, when the raw sheet 10 is sent out by the feed rolls 30 and 31, the seal rolls 40 and 41 are rotated so that the original sheet 10 can be reliably sent out even when the feed amount of the original sheet 10 is small. it can. Thereby, when manufacturing the bag body 15 with the small opening part 15d, the original fabric sheet 10 can be reliably sent out. At this time, since the elastic members 40b and 41b having a high coefficient of friction are provided on almost the entire outer surfaces of the seal rolls 40 and 41, the raw sheet 10 can be sent out more reliably.

  Further, by sealing the raw sheet 10 using the sealing rolls 40 and 41 whose surfaces are covered with the elastic members 40b and 41b, the original sheet 10 can be pressed and the area to be pressed is increased at the time of sealing. can do. Thereby, the raw fabric sheet 10 can be reliably pressed at the time of sealing, and the sealing accuracy and the sealing strength can be improved. Moreover, since the original fabric sheet 10 can be reliably pressed at the time of sealing, it is possible to easily reduce the interval at the time of sealing and cutting.

  The elastic members 40 b and 41 b are provided at the front and rear in the roll rotation direction at least at a position corresponding to the energization heating element 42, and each roll 40 when the first seal roll 40 is brought close to the second seal roll 41. If the elastic members 40b and 41b exist between the sheet 41 and the original fabric sheet 10, the original fabric sheet 10 can be reliably fixed at the time of sealing.

  Further, by sealing the raw sheet 10 using the seal rolls 40 and 41 provided with elastic members 40b and 41b that are thicker than the energizing heating element 42, the energizing heating element 42 and the original sheet 10 are sealed after sealing. Can be effectively peeled off. This eliminates the need for a dedicated peeling device, and can reduce the size of the device.

(Other embodiments)
Moreover, in the said embodiment, although the feed rolls 30 and 31 which consist of a pair of columnar roll were used as a sheet | seat delivery means, it is not restricted to this, For example, a belt conveyor etc. can also be used.

  Moreover, in the bag making machine of the above-described embodiment, an impulse seal is used as a seal by the sheet rolls 40, 41. You may comprise so that heat sealing may be performed.

  In addition, the heat seal of the above embodiment includes an impulse seal in which sealing is performed by applying strong heat energy to the part to be fused for a very short time and immediately cooling.

  Moreover, in the said embodiment, although the two-layered bubble sheet which consists of the uneven | corrugated sheet | seat 11 and the flat sheet | seat 12 was used as the raw fabric sheet 10, it is not restricted to this, Two flat sheets are provided on both sides of an uneven | corrugated sheet | seat. It is also possible to use a three-layered bubble sheet in which a sheet is joined.

  Moreover, in the said embodiment, although the bubble sheet which has the bubble part 13 was used as the original fabric sheet 10, it is not restricted to this, The present invention is the synthetic resin which does not have the foam sheet formed by extrusion foaming, or the bubble part 13. It can also be applied to sheets.

  Moreover, in the said embodiment, although the bending part 10a was formed with the triangular plate 20, and this was made into the base 15a of the bag body 15, it is not restricted to this, For example, this invention forms the base 15a by heat sealing | fusion It is also applicable to.

It is a perspective view of the bubble sheet of the said embodiment. It is a perspective view of the bag making machine of the above-mentioned embodiment. It is sectional drawing of a seal roll. It is process drawing which shows the manufacturing process of the bag body by the bag making machine of the said embodiment. It is an expanded sectional view of the part which seals the original fabric sheet | seat in a seal roll, a shows the state which hold | maintained the original fabric sheet | seat with the seal roll, and b has shown the state which has sealed the original fabric sheet | seat.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Original fabric sheet, 20 ... Triangular plate, 30, 31 ... Feeding roll, 40, 41 ... Seal roll, 42 ... Electric heating element

Claims (5)

A bag making machine for producing a bag body (15) having an opening (15d) on one side from a sheet (10) made of a synthetic resin,
Sheet feeding means (30, 31) for feeding the sheets (10) stacked on a plurality of sheets downstream;
Downstream of the sheet feeding means (30, 31), the sheet (10) is arranged perpendicular to the flow direction of the sheet (10), and is parallel to each other so that the sheets (10) stacked on a plurality of sheets are fed in between. A pair of rolls (40, 41) arranged;
The pair of rolls (40, 41) are rotatable in opposite directions so as to send the sheet (10) downstream,
On the outer peripheral surface of at least one roll (40) of the pair of rolls, a heating element (42) capable of raising the temperature to the melting point of the sheet (10) or more is provided in the axial direction.
The pair of rolls (40, 41) are in contact with each other via a state in which the distance between them is wider than the thickness of the sheet (10) stacked on a plurality of sheets and the sheet (10) stacked on a plurality of sheets. To move to a state
In a state where the pair of rolls (40, 41) is wider than the sheet (10) with a plurality of gaps overlapped with each other, the sheet (10) is downstream on the sheet feeding means (30, 31). Sent to
The sheet in which the pair of rolls (40, 41) are stacked on a plurality of sheets when the heating element (42) provided on the one roll (40) is in a position facing the other roll (41). The sheet (10) is brought into contact with each other via the (10), and the sheet (10) stacked on the plurality of sheets by the heating element (42) is melted and cut, and the sheet (10) stacked on the plurality of sheets is stacked. The bag making machine characterized by fusing and sealing the cut end portions (10b, 15c) of the bag. The pair of rolls (40, 41) includes elastic members (40b, 41b) provided on a portion of the outer peripheral surface excluding a portion corresponding to the heating element (42),
The elastic members (40b, 41b) are provided at the front and back of the position corresponding to at least the heating element (42) in the rotation direction of the pair of rolls (40, 41),
When the pair of rolls (40, 41) are moved to contact with each other via the sheets (10) stacked on a plurality of sheets, the rolls (40, 41) and the sheets (10) are not connected. The bag making machine according to claim 1, wherein the elastic member (40b, 41b) is present in the bag. The said elastic member (40b, 41b) is provided in the whole surface except the site | part corresponding to the said heat generating body (42) in the outer peripheral surface of the said pair of roll (40, 41). The bag making machine described in 1. The elastic member (40b, 41b) is thicker than the heating element (42),
When the pair of rolls (40, 41) are moved to contact with each other via the sheets (10) stacked on a plurality of sheets, the elastic members (40b, 41b) are elastically deformed to generate the heating element. The bag making machine according to claim 2 or 3, wherein (42) contacts the sheet (10). The sheet (10) is a bubble sheet in which at least a concavo-convex sheet (11) and a flat sheet (12) are joined to form a large number of bubble portions (13) in which gas is sealed. The bag making machine according to any one of claims 1 to 4.

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