JP2009067406A - Bag-making device and vertical type bag-making/filling device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a film with a valve from being creased or damaged when the film goes over a boundary of a former. <P>SOLUTION: The bag making device 13 has a gap k forming the film into an approximately tubular shape between a bag-making tube 24 and the former 25 guiding the film. The former 25 has a first guide 26 guiding the film to the gap k, a second guide 27 changing the transferring direction of the film from the first guide and passing the film through the gap k to form the film into the approximately tubular shape along the bag-making tube 24, and a clasping guide 27a combining both the ends of the film formed into the approximately tubular shape. The boundary 28 between the first guide 26 and the second guide 27 is approximately of a reverse teardrop shape tilting to the bag-making tube 24. A cut 31 for the valve 21 to pass through is formed in the arched portion having a relatively large radius of curvature in the vicinity of the clasping guide 27a of the boundary 28. A hole 30 is formed in the position of the bag-making tube 24 opposite to the cut 31. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a bag manufacturing method for manufacturing a bag-equipped bag by forming a bag-like film provided with a valve into a cylindrical body and filling the cylindrical body with various contents such as powder and granules. The present invention relates to an apparatus and a vertical bag making and filling machine using the same.

Conventionally, a belt-like film is formed in a substantially cylindrical shape, both ends are aligned and vertically sealed, the cylindrical body is continuously formed, the bottom is horizontally sealed, the contents are filled, and the top is horizontally sealed and cut. Thus, a vertical bag making and filling machine for forming a packaging bag is known. As a bag making apparatus for continuously forming a cylindrical body, it is known to use, for example, a former provided in a collar shape of a sailor suit.
On the other hand, the contents to be filled in the packaging bag include those that generate gas such as carbon dioxide after filling, such as coffee beans, and the contents that dislike moisture or oxygen entering the inside from the outside. is there. In such a case, a packaging bag provided with a valve consisting of a check valve is used to discharge the generated gas to the outside of the bag, or to restrict moisture and oxygen from entering the bag from the outside. Are known.

In such a vertical bag making and packing machine for making a packaging bag with a valve, a belt-like film with valves previously attached at a predetermined interval is supplied to a substantially cylindrical gap partitioned by a bag making tube and a former. After forming into a substantially cylindrical shape, vertical sealing and horizontal sealing are performed at both ends of the film.
Here, the former is, for example, a back guide section that guides the film with a valve that is fed from the roll and conveyed to the gap with the bag making tube, and changes the film conveying direction from the back guide section along the bag making tube. And an inner peripheral guide portion formed into a substantially cylindrical shape. And since the film transport direction changes greatly at the boundary between the back guide part and the inner periphery guide part, the high rigidity valve can get over the boundary part and enter the gap with the bag-making tube. There was an escape. However, when the valve is reversed at the boundary portion, the film is strongly pressed against the corner of the boundary portion, and scratches may occur.

In order to improve such problems, in the bag making apparatus 1 of the vertical bag making filling and packaging machine described in Patent Document 1, as shown in FIG. 7, the rear guide portion 4 and the inner peripheral guide portion 6 of the former 3 The boundary portion 5 has a boundary portion 5 where the film climbs over the boundary. And the valve | bulb inversion part 5a of the top part area | region of the boundary part 5 cuts off the top part between the inclined line-like ridgeline parts of the film inversion parts 5b and 5b of the both sides horizontally, and follows the conveyance direction of the valve | bulb 2 An arcuate rotation guide surface is formed.
For this reason, since the valve 2 gets over the arcuate valve reversing portion 5a, it can be smoothly conveyed, and the film f is not displaced, distorted, scratched, or the like.
JP 2006-76598 A

  However, in the conventional bag making apparatus 1 as described above, the valve reversing part 5a of the boundary part 5 cuts out the top part between the inclined line-shaped ridge line parts which are the film reversing parts 5b in the conveying direction of the valve 2. Since it formed in the arc-shaped surface which follows, the length of the valve | bulb inversion part 5a is short compared with the length of the film f which passes this area | region. Therefore, depending on how the top is cut, the film f may be loosened, and wrinkles and scratches may be generated on the manufactured bag. In order to prevent such wrinkles and scratches, adjusting the shape of the former 3 and the position of the film so as to balance the left and right of the film f requires skill and accuracy, and is difficult.

  The present invention has been made in view of such a problem, and uses a bag making apparatus and a bag making apparatus that reliably prevents wrinkles and scratches when the film with a valve crosses the boundary portion of the former. An object of the present invention is to provide a vertical bag making filling and packaging machine.

A bag making apparatus according to the present invention is a bag making apparatus in which a film provided with a valve is formed into a substantially cylindrical shape to produce a bag, and the bag making tube formed into a substantially cylindrical shape, and the bag making tube A former provided with a gap around the first guide part for guiding the film to the gap between the bag-making tube and the first guide part by changing the film conveyance direction. The first guide portion of the former has a second guide portion for forming the film into a substantially cylindrical shape along the bag-making tube through the gap, and a palm guide portion for aligning both ends of the film formed in the substantially cylindrical shape. A notch that allows the valve to pass therethrough is formed at a position that does not contact the palm guide portion at the boundary between the second guide portion and the second guide portion, and a hole is formed at the position facing the notch in the bag-making tube. Longitudinal direction of bag making tube Respect is formed in a generally inverted teardrop shape in an oblique direction, notch is characterized in that provided in the arcuate region relatively large radius of curvature of the boundary portion of substantially an inverted teardrop shape.
According to the present invention, the film provided with the valve is guided to the first guide portion of the former and guided to the gap between the bag making tube and the former, and the film is conveyed at the boundary between the first guide portion and the second guide portion. The direction is changed to form a substantially cylindrical shape through the gap between the bag-making tube and the second guide portion, and both end portions in the width direction of the film are joined by the palm guide portion of the former to form a palm portion. Moreover, when the film passes through the boundary of the former and is guided into the gap, the valve provided in the film passes through the notch provided in the boundary, but the film in the notch is in the form of an extension of the boundary. The direction of conveyance is changed in a stretched state, and at the same time, the direction of the valve is also changed between the notch and the hole of the bag-making tube, so the film does not loosen at the notch and the part with the film valve attached Wrinkles and scratches do not occur, including not only valves but also parts without valves. In addition, when the film provided with the valve passes through the notch, it is an arc-shaped region having a relatively large radius of curvature at the boundary that forms a substantially reverse teardrop shape, and is stretched in a line extending from the front and back of the notch. Even if there is a notch, the film does not sag. Even if the valve protrudes from the film at this time, the direction can be smoothly changed without contacting the bag-making tube to pass through the hole provided in the bag-making tube.
In addition, the hole part and notch part in this invention shall include not only the through-hole in a former | foamer or a bag making tube but a recessed part.

In addition, the notch portion is formed by one virtual surface connecting the center line of the bag-making tube and the palm guide portion at the boundary portion having a substantially reverse teardrop shape and another virtual surface orthogonal to the one virtual surface at the center line. It is preferable to form in the area | region by the side of the palm guide part among the area | regions divided into four.
If it is this area | region, since a notch part will be formed in the arc-shaped part with a comparatively large radius of curvature formed in the boundary part of a former | foamer, the slack of the film in a notch part can be suppressed.
Further, it is preferable that a guide groove for guiding the valve on the film to the notch is formed in the first guide portion of the former.
When the film is guided to the gap with the bag-making tube through the former guide part of the former, the valve is guided to the notch through the guide groove, so that the film around the valve does not float at the boundary part, and the direction is smooth. It is converted and guided to the gap.

A vertical bag-making filling and packaging machine according to the present invention supplies a belt-like film provided with a valve and bends it into a substantially cylindrical shape. In conjunction with the horizontal sealer, a vertical sealer that vertically seals the jointed portion of both ends in the film feed direction, a horizontal sealer that horizontally seals the vertically sealed tubular body in a direction that intersects the film feed direction, The contents are filled into a horizontally sealed cylindrical body through a bag-making tube.
According to the present invention, a film with a valve is intermittently conveyed and formed into a cylindrical body without wrinkles or scratches around the valve by a bag making apparatus comprising a bag making tube and a former. After joining the palms together with a vertical sealer, and then sealing the bottom of the cylindrical body as a lower seal with a horizontal sealer and filling the contents through the bag-making tube Then, the opening is heated and sealed with a horizontal sealer to produce a packaging bag.

According to the bag making apparatus of the present invention and the vertical bag filling and packaging machine using the same, the notch portion that allows the valve to pass to a position that does not contact the palm guide portion at the boundary between the first guide portion and the second guide portion of the former. Since the hole is formed at the position facing the notch in the bag-making tube, the film is supported by the arc-shaped boundary part having a relatively large curvature radius before and after the notch and is loosened at the notch. The valve can smoothly change its direction at the notch, the conveyance resistance is small, and wrinkles and scratches do not occur on the film and the packaging bag, so that a high quality packaging bag can be manufactured. And since the hole is provided in the bag making tube in the position which opposes a notch part, even if it attaches so that a valve may protrude from a film, it does not contact and conveyance resistance does not arise.
Further, unlike the prior art having a notch at the top, the influence of the notch on the film conveyance is small, so that the former including the notch and its front and rear portions can be easily manufactured.
Moreover, in the manufactured packaging bag, the valve is provided on the back surface having the vertical seal portion composed of the film palm portion, and since the valve is not provided on the surface of the bag, the appearance of the surface of the packaging bag looks good. Good.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
1 to 6 show a vertical bag making and filling machine and a manufactured packaging bag according to an embodiment of the present invention. 1 is an explanatory view showing a schematic configuration of a vertical bag making filling and packaging machine according to an embodiment, FIGS. 2 and 3 are a front view showing a bag making apparatus of the vertical bag making filling and packaging machine shown in FIG. FIG. 4 is a plan view of the bag making apparatus shown in FIG. 2, and FIGS. 5 and 6 are a front view and a horizontal sectional view of the bag with a valve manufactured by the vertical bag filling and packaging machine according to the embodiment. It is.
As shown in FIG. 1, a vertical bag making and packaging machine 10 according to the present embodiment includes a film supply unit 11, a hopper 12 for supplying contents such as powder and granules, a bag making device 13, a vertical sealer 14, and a delivery. The belt 15 and the lateral sealer 16 are roughly configured. A packaging bag F with a valve 21 is manufactured by the vertical bag making filling and packaging machine 10.
As shown in FIGS. 5 and 6, the valve-equipped packaging bag F is formed as, for example, a flat bag including a front surface 101 and a back surface 102, and an upper seal portion 103 and a lower seal portion 104 are formed by a horizontal sealer 16. A joint portion 105 a formed by joining both ends in the width direction of the film f at a substantially central portion of the back surface 102 of the bag F is formed as a longitudinal seal portion 105 by the longitudinal sealer 14. On the back surface 102, the valve 21 is attached in the vicinity of the vertical seal portion 105 so as to protrude from the inner surface.

Next, in the vertical bag making and filling and packaging machine 10 shown in FIG. 1, the film supply unit 11 pulls out the film f from the packaging material reel 18 wound with a band-shaped film f having a predetermined width as a packaging material, and combines a plurality of rollers. It is a mechanism that is transported by the film transport mechanism 19 and is supplied to the bag making apparatus 13. The material of the film f may be any material as long as it can be heat sealed. For example, a synthetic resin film or a laminate film can be employed.
A valve attachment device 22 for fixing the valve 21 to the film f stretched between the pair of rollers 20 a and 20 b is provided in the middle of the film transport mechanism 19 in the film supply unit 11. The valve 21 is attached to one end side in the width direction of the film f, and is disposed so as to protrude into the bag after bag making.
For example, the valve 21 discharges gas generated inside the packaging bag F to the outside of the packaging bag F, and blocks or regulates the flow of gas from the outside, such as oxygen, nitrogen, and water vapor, into the bag. Is. For example, the valve 21 may have a disk shape in which a gas selection filter and a check valve are provided in a flat synthetic resin case having a substantially circular shape in plan view.
And the valve | bulb 21 is fixed on the surface of the film f used as the inner side of the packaging bag F, and it can attach so that the valve | bulb 21 may not be exposed to the exterior of the packaging bag F by forming a gas permeation hole in the back. . The gas generated inside the packaging bag is, for example, carbon dioxide when the contents are made of coffee beans or the like.

The valve attachment device 22 seals and attaches the valve 21 to the film f by an appropriate attachment means using, for example, a heat sensitive adhesive or heat fusion, and opens an exhaust hole in a film portion corresponding to the valve exhaust hole. . In addition, the attachment position of the valve | bulb 21 in the width direction of the film f by the valve | bulb attachment apparatus 22 shall be previously determined by the positional relationship with the notch part 31 of the former 25 mentioned later.
In the film transport mechanism 19 on the downstream side of the valve mounting device 22, although not shown, an escape portion or the like that avoids the valve 21 protruding from the film f is formed on a transport roller or the like as necessary. Therefore, even after the valve 21 is attached, the film f can be smoothly conveyed.
The hopper 12 is a mechanism that automatically supplies a predetermined amount of contents at a predetermined timing. That is, a cylindrical body of the film f is formed by being vertically sealed by the vertical sealer 14, and when the lower part of the cylindrical body is horizontally sealed by the horizontal sealer 16 and the bottom is sealed, the upper part is then horizontally sealed. In the meantime, the contents are filled, the upper part is laterally sealed, and then cut with a cutter (not shown) in the middle of the lateral sealer 16 to form a packaging bag F.
These steps are sequentially repeated.

Next, the bag making apparatus 13 of the vertical bag making filling and packaging machine 10 will be described.
The schematic configuration of the bag making apparatus 13 shown in FIG. 1 includes a bag making tube 24 and a former 25. The bag-making tube 24 is a substantially cylindrical, for example, cylindrical tube member that is provided below the hopper 12 and extends in the vertical direction. The bag-making tube 24 guides the formation of the film f and is supplied to the inside of the hopper 12. Things will pass through. A former 25 is provided on the upper outer peripheral surface of the bag making tube 24 so as to surround the periphery thereof.
As shown in FIGS. 2 to 4, the former 25 includes a first guide portion 26 for guiding the film f conveyed from the film supply portion 11, for example, in a substantially horizontal direction, around the bag-making tube 24, A substantially cylindrical second guide portion 27 that is connected to the guide portion 26 and that extends in the extending direction of the bag-making tube 24 with an outer circumferential surface of the bag-making tube 24 and a slight circular gap k therebetween is provided. .
As shown in FIG. 1 and FIG. 4, the first guide portion 26 feeds the film f transported from the film supply portion 11 into the bag making tube 24, for example, a rear guide 26 a having a substantially triangular shape in plan view with an upward slope, The peripheral surface guide 26b is connected to the guide 26a and is inclined downward so as to surround the entire circumference of the bag-making tube 24 from the back surface guide 26a.

The back guide 26a has a triangular vertex that reaches the vicinity of the bag-making tube 24, and includes a two-sided portion of the triangle that includes the vertex to draw a convex curved surface and is smoothly connected to the circumferential guide 26b.
The peripheral guide 26b having a downward inclination is formed such that the end in the downward direction surrounding the bag making tube 24 is inclined obliquely in a side view with respect to the longitudinal direction of the bag making tube 24. It is connected to a second guide portion 27 having a substantially cylindrical shape that forms a slight gap k over the entire circumference with the outer peripheral surface. The boundary portion 28 between the peripheral surface guide 26b and the second guide portion 27 has a substantially reverse teardrop shape that is inclined obliquely, and forms a conveyance direction change guide for the film f.
Here, in FIG. 2, the second guide portion 27 is not completely cylindrical, but is provided with a slit-like opening that communicates vertically. This opening is provided with a palm guide portion 27 a along the longitudinal direction of the bag-making tube 24 for palming both ends in the width direction of the film f formed in a substantially cylindrical shape. The palm guide portion 27a is continuous with a detail located on the lower end side of the boundary portion 28 having a substantially reverse teardrop shape. The two ends of the peripheral surface guide 26b at the lower end located at the lowest position of the peripheral surface guide 26b converge so as to approach each other, extend a minute interval in the vertical direction, and are connected to the palm guide portion 27a.

As shown in FIGS. 2 to 4, a notch portion 31 is formed in a position where the lower end side of the boundary portion 28 between the first guide portion 26 and the second guide portion 27 is not in contact with the palm guide portion 27 a. ing. The cutout 31 is cut out in a substantially V shape in plan view (see FIG. 4). Accordingly, when the film f is changed in the transport direction from the first guide portion 26 of the former 25 to the second guide portion 27, the rigid valve 21 can smoothly get over the region of the boundary portion 28.
The bag making tube 24 is formed with, for example, an elliptical hole 30 extending in the longitudinal direction at a position facing the notch 31. The hole 30 intersects the boundary portion 28 between the first guide portion 26 and the second guide portion 27 and extends in the vertical direction. The film f is formed at the boundary portion 28 of the former 25 at the bag making tube 24. The valve 21 is cut out so as not to come into contact with the bag-making tube 24 when the direction is changed along the direction.
A notch 31 is formed in the boundary portion 28 between the first guide portion 26 and the second guide portion 27 at a position facing the hole portion 30. The cutout 31 is cut out in a substantially V shape in plan view (see FIG. 4). Accordingly, when the film f is changed in the transport direction from the first guide portion 26 of the former 25 to the second guide portion 27, the rigid valve 21 can smoothly get over the region of the boundary portion 28.

In addition, the curvature of the substantially reverse teardrop-shaped boundary portion 28 is such that the boundary portion 28 passes through an extended line connecting the portions of the boundary portion 28 before and after the cutout portion 31 even if the cutout portion 31 is present. A notch 31 is formed in a region having a large radius and close to but not in contact with the palm guide portion 27a.
In other words, in FIG. 2 and FIG. 4, a virtual plane L1 that passes through and includes the center line O of the cylindrical bag-making tube 24 and the palm guide portion 27a, and is orthogonal to the virtual plane L1 at the center line O. By dividing the boundary portion 28 of the bag-making tube 24, the gap k, and the former 26 by the virtual plane L2, each region is set as A, B, C, D, and the region of the boundary portion 28 that forms the notch 31 is Two regions C and D in the vicinity of the palm guide portion 27a are preferable.
This is a substantially elliptical shape in which the boundary portion 28 is inclined with respect to the longitudinal direction of the bag-making tube 24, more precisely a substantially reverse teardrop shape, and the boundary portion 28 of the arcuate regions C and D on the lower side thereof is a palm guide. Since the tapered portion of the substantially reverse tear shape connected to the portion 27a is formed, the radius of curvature is larger than that of the arcuate regions A and B on the upper side, and the arc is formed by the boundary portion 28 toward the palm guide portion 27a. This is because the radius of curvature gradually increases and approaches a straight line.

  In addition, a guide groove 33 having a concave section is formed on the peripheral surface guide 26b of the first guide portion 26 of the former 25 so that the groove gradually becomes deeper as the notch portion 31 is approached (see FIG. 3). As a result, the valve 21 can be prevented from protruding from the peripheral surface guide 26b due to its thickness when the valve 21 goes to the boundary portion 28 of the former 25, and the film around the valve (excluding the portion where the valve is attached) The conveyance direction can be changed without floating up from 28.

The vertical sealer 14 provided below the bag making apparatus 13 in the bag making tube 24 receives the palm portion 105a of the film f aligned by the palm guide portion 27a of the former 25, and sandwiches and heat seals from both sides. It is.
In the bag making tube 24, a pair of feeding belts 15, 15 provided on both sides of the vertical sealer 14 on the lower side are formed into a cylindrical body by the former 25 and heat-sealed by the vertical sealer 14 to form a bag f. It is a transport means for transporting downward along the tube 24.
The horizontal sealer 16 is provided below the bag-making tube 24, heat-sealed in a direction transverse to the tubular film f, and the upper opening of the packaging bag F conveyed in advance and the next cylinder. This is a mechanism for simultaneously heat-sealing the bottom of the body and cutting the both as upper seal 103 and lower seal 104.

The vertical bag making filling and packaging machine 10 according to the present embodiment has the above-described configuration. Next, the operation thereof will be described focusing on the folding and making of the film f by the bag making apparatus 13.
In FIG. 1, the film f fed from the packaging material reel 18 is supplied to the bag making apparatus 13 from the film supply section 11 by attaching the valve 21 to the vicinity of one end in the film width direction by the valve mounting apparatus 22. Then, the film f is guided by the first guide portion 26 in the former 25 and intermittently conveyed on the back guide 26 a obliquely upward toward the bag making tube 24.
When the film f is intermittently conveyed from the back guide 26a of the first guide part 26 to the peripheral guide 26b, first, the uppermost part of the boundary part 28 having a substantially reverse teardrop shape in which the central part in the width direction of the film f is inclined first. The direction is changed from (the boundary between the regions A and B), guided into the gap k between the bag making tube 24 and the second guide portion 27 of the former 25, and sent along the bag making tube 24 into the gap k. At this time, the film f is a region where the radius of curvature of the substantially arc of the boundary portion 28 in the region C is relatively large, and the ridgeline for changing the conveyance direction is set with the same tension of the film f as in the case where the notch portion 31 is assumed. Form and bend.
The peripheral portions on both sides in the width direction of the film f are conveyed in the downward inclination direction on the peripheral surface guide 26b of the first guide portion 26. Then, the film f is gradually bent at the boundary portion 28 between the circumferential guide 26 b and the second guide portion 27 to change the direction, and is guided into the gap k between the bag making tube 24 and the second guide portion 27 of the former 25. And conveyed in the gap k along the bag making tube 24. Therefore, the film f is formed in a substantially cylindrical shape within the gap k between the bag making tube 24 and the second guide portion 27, and both end portions in the width direction of the film f are formed in contact with each other at the palm guide portion 27a.

Here, when the valve 21 attached to the film f advances through the first guide portion 26 of the former 25 and reaches the vicinity of the boundary portion 28 of the circumferential guide 26b, the bulb 21 is gradually recessed with respect to the circumferential guide 26b. Therefore, the valve 21 moves along with the surrounding film f without being lifted from the peripheral surface guide 26b.
Then, at the boundary portion 28, the film f around the bulb 21 changes its direction at the same ridgeline as when the cutout portion 31 is assumed to be absent, and the bulb 21 has a ridgeline of the film f at the cutout portion 31 due to its rigidity. Transforms directions with different ridges. A hole 30 is formed in the part of the bag-making tube 24 facing the notch 31, and it does not come into contact with the bag-making tube 24 even if the rotation trajectory is large when the direction of the valve 21 is changed. No wrinkles or scratches occur on the film f around the bulb 21.

The film f transported in the gap k between the bag making tube 24 and the former 25 is formed into a substantially cylindrical body, and the palm portions 105a at both ends in the film width direction formed by the palm guide portions 27a are formed. It is sandwiched and heat-sealed by a vertical sealer 14 provided on the downstream side in the conveying direction, and a vertical seal portion 105 is formed.
The cylindrical body is intermittently conveyed further downstream by the feeding roller 15, and in the stopped state, the bottom of the cylindrical body and the upper opening of the packaging bag F preceding this are simultaneously heat-sealed by the horizontal sealer 16. As a result, the cylindrical body is provided with the lower seal portion 104, the preceding packaging bag F is completed with the upper seal portion 103, and the upper and lower seal portions 104, 103 are cut with a cutter.
Next, the cylindrical body is filled with the contents from the hopper 12 through the bag-making tube 24, further intermittently conveyed downward, and the upper opening is heated and sealed by the horizontal sealer 16 described above to form the upper seal portion 103. It is cut with a cutter.
By repeating such operations, the packaging bags F with the valves 21 are sequentially manufactured.

As described above, according to the vertical bag making and filling and packaging machine 10 according to the present embodiment, the notch 31 is formed in the arc-shaped portion having a relatively large radius of curvature of the substantially reverse teardrop shape at the boundary portion 28 of the former 25 and is opposed to the former. Since the hole 30 is provided in the bag making tube 24, the direction change of the valve 21 is smooth and the conveyance direction conversion resistance is small and smooth because the valve 21 does not contact the bag making tube 24 or the former 25 even if the valve 21 protrudes from the film f. Can change direction. In addition, since the guide groove 33 is provided in the circumferential guide 26b in the middle of the valve 21 reaching the notch 31, the film 5 around the valve 21 does not float, and the direction change at the extended line portion of the boundary portion 28 is smoother. Become.
Moreover, since the film f supported by the boundary portion 28 before and after the notch portion 31 does not loosen or deform and changes direction along the extension line of the boundary portion 28, the valve 21 at the boundary portion 28 is attached. A high-quality packaging bag F can be manufactured without causing wrinkles or scratches on the film. In addition, since the influence of the cutout 31 on the conveyance of the film f is small as compared with the above-described conventional technology, the former 25 can be easily manufactured without requiring high-precision adjustment in the arrangement of the cutout 31 and the film f.
Moreover, since the valve 21 is located on the back surface 102 provided with the vertical seal portion 105 in the manufactured packaging bag F, the attachment mark of the valve 21 does not appear on the surface 101 which is easily noticeable by consumers, and the appearance is good.

In the above-described embodiment, the hole 30 and the notch 31 are provided in the region C of the boundary portion 28 in the circumferential guide 26b of the bag-making tube 24 and the former 25, but the hole is formed in the region D on the opposite side. 30 and the notch 31 may be provided, and in this case, it is necessary to set the position where the valve 21 of the film f is provided on the end side opposite to the film width direction opposite to the above-described embodiment. .
Further, the hole 30 provided in the bag making tube 24 and the notch 31 provided in the boundary portion 28 of the former 25 are formed as an oval hole and a substantially V-shaped notch. The shape of the part 31 is not limited to this, and an appropriate shape can be adopted.
In addition, although the guide groove 33 for guiding the valve 21 of the film f to the notch 31 is formed in the peripheral surface guide 26b, the guide groove 33 is not necessarily provided.

In the packaging bag F shown in FIGS. 5 and 6, the portion of the film f that passes through the palm guide portion 27 a becomes the palm portion 105 a of the packaging bag F, that is, the vertical seal portion 105. Further, among the areas A to D that divide the boundary portion 28 and the gap k into four parts, the part of the film f that passes through the areas A and B appears on the surface 101 of the packaging bag F and the film f that passes through the areas C and D. The portion appears on the back surface 102 of the packaging bag F. The notch 31 through which the valve 21 passes may be provided in the boundary portion 28 that does not contact the palm guide portion 27a in the region C or D. Therefore, in the packaging bag F shown in FIGS. If it is a place which does not touch the palm portion 105a, the attachment position is arbitrary.
In addition, in the above-mentioned embodiment, the hole part 30 provided in the bag making tube 24 shall not be limited to a through-hole, but shall also include a recessed part. Similarly, the notch 31 provided in the former 25 includes not only a notch hole penetrating the front and back, but also a notch-like part.

It is a figure for demonstrating schematic structure of the vertical bag making filling packaging machine which has a bag making apparatus which concerns on embodiment of this invention. It is an enlarged front view which shows the bag making apparatus of the vertical bag making filling packaging machine in FIG. It is the elements on larger scale which expanded the notch part part in FIG. It is the principal part top view which looked at the bag making apparatus shown in FIG. 2 from upper direction. It is a rear view of the packaging bag manufactured with the vertical bag making filling packaging machine by this embodiment. It is sectional drawing which cut the packaging bag shown in FIG. 5 with the horizontal surface containing a valve | bulb. It is a principal part enlarged view of the former | foamer of the bag making apparatus in the conventional vertical bag making filling packaging machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vertical bag making filling packaging machine 13 Bag making apparatus 14 Vertical sealer 15 Feeding belt 16 Horizontal sealer 24 Bag making tube 25 Former 26 First guide part 26a Back surface guide part 26b Circumferential guide part 27 Second guide part 27a Joint guide part 28 Boundary part 30 Hole part 31 Notch part 33 Guide groove f Film F Packaging bag O Center line L1, L2 Virtual plane

Claims (4)

A bag making apparatus for forming a film provided with a valve into a substantially cylindrical shape and making a bag,
A bag-making tube formed into a tubular shape;
A former provided with a gap formed around the bag-making tube,
The former includes a first guide part that guides the film to the gap between the bag-making tube, and a film that is moved along the bag-making tube through the gap by changing the film transport direction from the first guide part. It has a second guide portion that is formed into a cylindrical shape, and a palm guide portion that aligns both ends of the film that is formed into a substantially cylindrical shape,
A notch for allowing the valve to pass is formed at a position not in contact with the palm guide portion at the boundary between the first guide portion and the second guide portion of the former, and the bag-making tube is at a position facing the notch portion. A hole is formed, and a boundary portion of the former is formed in a substantially reverse teardrop shape in an oblique direction with respect to a longitudinal direction of the bag-making tube, and the notch portion is a relatively boundary of the boundary portion forming a substantially reverse teardrop shape. A bag making apparatus provided in an arcuate region having a large radius of curvature.   The notch includes a virtual line connecting the center line of the bag-making tube and the palm guide part with respect to a boundary part having a substantially reverse teardrop shape, and another virtual plane orthogonal to the one virtual plane at the center line. The bag making apparatus according to claim 1, wherein the bag making apparatus is formed in an area on the side of the palm guide portion in the area divided into four by.   The bag making apparatus according to claim 1 or 2, wherein a guide groove for guiding the valve on the film to the notch portion is formed in the first guide portion of the former. The bag making apparatus according to any one of claims 1 to 3, wherein a belt-like film provided with a valve is supplied and bent into a substantially cylindrical shape,
A vertical sealer that vertically seals the palm portion in which the both ends of the film are combined with each other at the palm guide portion in the film feeding direction;
A horizontal sealer that horizontally seals the vertically sealed cylindrical body in a direction crossing the film feeding direction;
A vertical bag-filling and packaging machine characterized in that the contents are filled into a horizontally-sealed cylindrical body through the bag-making tube in conjunction with the horizontal sealer.

Images