JPH0939916A - Manufacture of bag, and apparatus therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bag manufacturing apparatus capable of manufacturing bags having uniform cut end parts in a stable manner and at high speed. SOLUTION: A bag-manufacturing machine is provided with a transfer means 3 for transferring a belt-like cylindrical body 2 of a thermoplastic resin in a longitudinal direction and locating it at a predetermined position, a welding means 4 for fuse-cutting the cylindrical body in its width direction in a predetermined length from a forward end opening 2a of the cylindrical body 2, a cutting means 5 for cutting the cylindrical body in its width direction at a slightly rear portion in the transferring direction of the cylindrical body from the end part welded by the welding means 4, and a separating means 6 disposed between the fuse-cutting means 4 and the cutting means 5 for separating a separation portion 20 having both ends of the welded end part A and the cut end part B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag made of a thermoplastic resin, and particularly suitable for manufacturing a packaging bag for storing a plurality of individual packages of sanitary napkins, hygienic articles such as disposable diapers, and the like. Manufacturing method and bag making apparatus.

[0002]

2. Description of the Related Art As is well known, sanitary napkins and hygiene articles such as disposable diapers are individually packaged, and then a predetermined number of them are accommodated in one packaging bag and double-packed.
Supplied to the market. Such a packaging bag is made of a thermoplastic resin sheet, is flatly folded with gusset portions on both sides, has a fusing part at one end, and has an opening at the other end (hereinafter, referred to as ""Gazettebag") is used. As a conventional technique for manufacturing such a gusset bag, the techniques described in Japanese Utility Model Laid-Open No. 61-160002 and Japanese Patent Laid-Open No. 52-56862 are known.

In the technique described in the above publication, a cylindrical tubular body made of a thermoplastic resin is conveyed in the longitudinal direction, and the cylindrical body is continuously heated by a heat sealing means at predetermined intervals in the conveying direction. While sealing, the heat seal part is further cooled by the accumulator in the front side, further conveyed to the front side and positioned, and a slightly rear part of the seal end of the heat seal part is cut by a cutting means, and the one end A bag having a heat-sealed portion heat-sealed by the heat-sealing and an opening portion at the other end is sequentially manufactured.

[0004]

By the way, in the bag manufacturing apparatus (method) as described above, the cutting step is performed only after the heat sealing is performed and then the heat sealed portion is sufficiently cooled through the accumulator. However, the cooling capacity of the heat-sealed portion is rate-determining, and the manufacturing capacity is limited.

Further, in the above manufacturing apparatus, the heat sealing step and the cutting step are performed in separate steps. Therefore, if the conveying speed of the tubular body is increased above a certain level, it may not be possible to cut at a predetermined cutting end, There was no choice but to raise the product defect rate.

Accordingly, an object of the present invention is to provide a bag manufacturing method and a bag manufacturing apparatus capable of stably manufacturing a bag having a uniform cut end at a high speed.

[0007]

According to a first aspect of the present invention, a strip-shaped tubular body made of a thermoplastic resin is conveyed in the longitudinal direction and positioned at a predetermined position, and then the tubular body is moved. The tubular body is melted at a predetermined length from the tip opening, and the tubular body is cut slightly rearward of the fusing end in the conveying direction of the tubular body, and the fusing end and the cutting end are both ends. A method for manufacturing a bag, characterized in that the separation part is separated from the tubular body, and a bag having a heat-sealed portion heat-sealed by the fusing at one end and an opening at the other end is sequentially manufactured. By providing it, the said objective was achieved.

The invention according to claim 2 of the present invention is
After a belt-shaped tubular body made of a thermoplastic resin is conveyed in the longitudinal direction and positioned at a predetermined position, the tubular body is heat-sealed with a predetermined length from its tip opening and the heat-sealing end portion or The tubular body is cut slightly rearward of the heat-sealing end in the conveying direction of the tubular body, and the one end has a heat-sealing portion heat-sealed by the fusing and the other end has an opening. The above object is achieved by providing a bag manufacturing method characterized by sequentially manufacturing bags.

Further, the invention according to claim 3 of the present invention provides:
As a device suitable for carrying out the method for manufacturing a bag of the present invention, as a device suitable for carrying a belt-shaped tubular body made of a thermoplastic resin in the longitudinal direction and positioning it at a predetermined position, a tip of the tubular body. A fusing means for fusing the tubular body in the width direction with a predetermined length from the opening, and a cutting for cutting the tubular body in the width direction slightly behind the fusing end in the conveying direction of the tubular body. Provided is a bag-making apparatus comprising: means and a separating means that is disposed between the fusing means and the cutting means and separates a fusing end portion and a separation portion having the cutting end portion as both end portions. To do.

In the bag manufacturing method according to claim 1 of the present invention, the tubular body is conveyed in the longitudinal direction and positioned at a predetermined position, and the tubular body has an opening at the tip thereof. From the fusing end portion at a predetermined distance from the fusing end portion, and is cut slightly rearward in the transport direction of the tubular body,
Since the separation portion between fusing and cutting is separated from the cylindrical body, the cooling step is unnecessary. There is no possibility that the cutting position shifts between fusing and cutting. After the cutting, a new front end opening is formed in the tubular body, so that the bag can be successively manufactured by again transporting the belt-like body forward.

In the bag manufacturing method according to the second aspect of the present invention, the tubular body is conveyed in the longitudinal direction and positioned at a predetermined position, and the tubular body has its tip end. Since heat sealing is performed at a predetermined length from the opening and cutting is performed at the end of the heat sealing or at a position slightly rearward of the end of the heat sealing in the transport direction of the tubular body, a gap between the heat sealing and the cutting is formed. There is no risk of the cutting position shifting. After the cutting, a new tip opening is formed in the tubular body, so that the belt-shaped body can be conveyed forward again,
The bags can be manufactured sequentially.

In the bag making apparatus according to the third aspect of the present invention, first, the belt-shaped cylindrical body is conveyed in the longitudinal direction by the conveying means and positioned at a predetermined position. Then, by the fusing means, the tubular body is fused in a width direction from the tip end opening portion with a predetermined length, and slightly behind the fusing end portion in the transport direction of the tubular body,
The tubular body is cut in the width direction by the cutting means. Then, a bag having a heat-sealed portion heat-sealed by the fusing at one end and an opening at the other end is manufactured. The separation part, which is generated at the time of the fusing and cutting and has the fusing end and the cutting end as both ends, is separated by the separating means.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows an embodiment in which the bag making apparatus according to the present invention is applied to a bag making apparatus for a gusset bag which constitutes a part of a packaging machine. In the figure, reference numeral 1 indicates a bag-making device, and 2 indicates a gusset tube (band-shaped tubular body).

As shown in FIG. 1, the bag making apparatus 1 is
A conveying means 3 for conveying the gusset tube 2 made of a thermoplastic resin in the longitudinal direction and positioning it at a fixed position, and fusing the gusset tube 2 in the width direction with a predetermined length from the tip opening 2a of the gusset tube 2. Fusing means 4, cutting means 5 for cutting the gusset tube 2 in the width direction at a cutting end B slightly behind the fusing end A by the fusing means 4 in the conveying direction of the gusset tube 2, and the fusing means 4 and the cutting means. 5 is provided between the fusing end portion A and the fusing end portion B of the tubular body 2 for separating the separating portion 20 having both ends.

The conveying means 3 is arranged above and below a pair of feed rollers 30 and is arranged in front of the fusing means 4 and works in conjunction with the feed rollers 30 to form the gusset tube 2.
And a drive source (not shown) for driving the feed roller 30 and the vacuum conveyor 31. The vacuum conveyor 31 is configured so as to be able to convey the conveyed material on the conveyor belt while sucking the negative pressure, and conveys the gusset tube 2 that has passed below the fusing means 4 while sucking it, and is manufactured. The gusset bag is stably conveyed forward and is reliably delivered to the subsequent process in a packaging machine (not shown). Further, the vacuum conveyor 31 is provided with a sensor for detecting the front end opening portion 2a of the gusset tube 2, and by outputting the detection output to a controller (not shown) described later, the feed roller 30 and the vacuum roller are connected. The conveyor 31 is stopped so that the gusset tube 2 can be accurately positioned.

The fusing means 4 comprises a fusing head 40 and an anvil 41 arranged above and below the conveyed gusset tube 2, and a piston / cylinder mechanism 42 for moving the fusing head 40 up and down.

The fusing head 40 is formed of a metal material such as brass, stainless steel, aluminum or the like, and the lower end portion 40a thereof has an acute-angled shape tapering downward. Inside the fusing head 40, the lower end 40
A heater (not shown) whose temperature can be set to 100 ° C. to 400 ° C. is provided, and a heat seal having a width of 0.5 mm to 1.0 mm from the fusing end A depending on the set temperature of the lower end 40 a. The gusset tube 2 is constructed so that it can be melt-cut across the entire width direction, leaving the portion. Also,
In the fusing head 40, the heater temperature is set low and the pressing force on the anvil 41 is set low, so that
It is configured to allow heat sealing of ~ 3.0 mm width.

The cutting means 5 is arranged behind the heat sealing means 4 in the conveying direction of the gusset tube 2. The cutting means 5 is disposed above and below the upper gusset tube 2 to cut the upper gusset tube 2.
0 and the lower blade 51 and the piston that moves the upper blade 50 up and down.
And a cylinder mechanism 52.

The upper blade 50 has a wedge shape when viewed from the side, and its lower end edge 50a is formed flat. The lower blade 51 has a horizontal upper surface, and its upper end edge 51a is flat like the lower end edge 50a. The upper blade 50 moves up and down by operating the piston / cylinder mechanism 52, and cuts the gusset tube 2 together with the lower blade 51 with a uniform force in the width direction. Also,
A position adjusting mechanism (not shown) is attached to the upper blade 50 and the lower blade 51, and the distance d between the fusing end A and the cutting end B is arbitrarily set within a range of 0 mm to 50 mm. It can be adjusted. Then, the thermal fusing head 4
The gusset tube 2 can be cut in accordance with the width of the heat-sealing caused by the fusing of the gusset tube 2 due to. When only heat sealing is performed by the fusing head 40 without fusing the gusset tube 2, the gap between the heat sealing end and the cutting end should be set to 0 mm to 50 mm by cutting from the heat sealing end. Is possible.

The separating means 6 is arranged between the fusing means 4 and the cutting means 5. This separating means 6
Is a pair of upper and lower clamping plates 60, 6 disposed above and below the gusset tube 2 to clamp the gusset tube 2.
1 and a piston / cylinder mechanism 62 for vertically moving the holding plate 60.

The upper and lower surfaces of the sandwiching plates 60 and 61 are horizontally formed, and a rubber (not shown) for preventing slippage is attached to the upper and lower surfaces thereof so that the gazette tube 2 slides. Therefore, the separation of the separation portion 20 can be performed without any trouble. The upper surface of the sandwiching plate 61 is the anvil 41 of the fusing means 4.
Is arranged about 5 mm below the upper surface of the holding plate 6, and even if the gusset tube 2 is not completely melted by the melting head 40, then the sandwiching plate 6
When the separated portion 20 is sandwiched by 0 and 61, a shearing force acts so that it can be surely melted.

Although not shown in the drawing, in the bag making apparatus 1, independent operation of each piston / cylinder mechanism, heater temperature in the fusing head 40, feed roller 30 and vacuum conveyor 31 are provided. It is equipped with a controller that controls driving and stopping. And, it corresponds to various manufacturing procedures such as the procedure of the method for manufacturing the gusset bag described later, and the device can be stably operated according to the size and shape of the gusset bag to be manufactured, the manufacturing speed, and the like. . The control by this controller may be performed by the main controller of the packaging machine body.

Although not shown in the figure, a discarding means provided with a negative pressure source and a suction pipe line is provided in the vicinity of the sandwiching plate 61, and the separated portion is melted and cut from the gusset tube 2. 20 can be sucked and forcibly discarded.

Next, the procedure of the embodiment of the bag manufacturing method according to the present invention will be described based on the procedure for manufacturing the gusset bag by the bag manufacturing apparatus 1.

(First Embodiment) First, both ends in the width direction of a strip-shaped sheet (not shown) made of a thermoplastic resin are rolled up, overlapped and folded into a cylinder, and the overlapped portion is a center sealer (not shown). (2) to form a band-shaped tube, and both widthwise ends of the band-shaped tube are bent into an inner package to provide a gusset portion, and the band-shaped gusset tube 2
To form

Next, as shown in FIG. 1, the gusset tube 2 is conveyed in its longitudinal direction, and the feed roller 3
It is rolled up at 0 and conveyed almost horizontally. The tip opening 2a of the gusset tube 2 passes below the fusing head 40, and when the gusset tube 2 reaches a predetermined length on the vacuum conveyor 31, the gusset tube 2 is stopped from being conveyed and positioned. To do.

Then, as shown in FIG. 2, the piston / cylinder mechanisms 42 and 52 are simultaneously actuated to melt the gusset tube 2 across its entire width and at a position slightly rearward of the melted end A thereof. Cut across the width. At this time, a new tip opening is formed in the gusset tube 2 at the cut end B.

Then, as shown in FIG. 3, from the start of the operation of each of the piston / cylinder mechanisms 42 and 52, 0.
After 1 to 1.0 seconds, the piston / cylinder mechanism 6
Activate 2 Then, the holding plates 60, 61
The holding portion 20 sandwiches the separating portion 20 having the fusing end portion A and the cutting end portion B as both end portions, and pulls the portion 20 downward to separate the portion. After the separation is completed, the piston / cylinder mechanisms 42, 52 and 62 are operated to retract the fusing head 40, the upper blade 50 and the sandwiching plate 60 upward, and the manufacture of the gusset bag is completed.

By repeating the above operation, 0.5 m heat-sealed by the above-mentioned fusing at one end as shown in FIG.
A gusset bag 10 having a heat-sealing portion 10a having a width of m to 1.0 mm and having an opening 10b at the other end is sequentially manufactured.

(Second Embodiment) Similar to the manufacturing procedure of the first embodiment, the gusset tube 2 is transported and positioned at a predetermined position. Then, the piston / cylinder mechanism 42 is actuated to melt and cut the gusset tube 2 over its entire width direction.

Then, 0.1 second to 1.0 second after the start of the operation of the piston / cylinder mechanism 42, the piston / cylinder mechanisms 52 and 62 are simultaneously actuated, so that they are slightly rearward of the fusing end A of the gusset tube 2. While cutting the cutting end B in the width direction, the holding plates 60, 6
The separation part 20 having the fusing end A and the cutting end B as its both ends is sandwiched by 1 and is pulled down to separate. And
The pistons / cylinders 42, 52 and 62 are operated to retract the fusing head 40, the upper blade 50 and the sandwiching plate 60 upward, and the manufacturing of the gusset bag 10 (see FIG. 4) is completed.

(Third Embodiment) Similar to the manufacturing procedure of the first embodiment, the gusset tube 2 is transported and positioned at a predetermined position. Then, the piston / cylinder mechanism 52 is operated to cut the cutting end B of the gusset tube 2 slightly rearward of the fusing end A in the width direction. Then, after 0 second (simultaneous) to 1.0 second, the piston / cylinder mechanism 42 is operated to melt and cut the gusset tube 2 over the entire width direction.

Then, 0.1 second to 1.0 second after the start of the operation of the piston / cylinder mechanism 42, the piston / cylinder mechanism 62 is operated, and the holding plate 60,
At 61, the separating portion 20 having the fusing end A and the cutting end B as both ends is sandwiched, and is pushed downward to separate. The piston / cylinder mechanism 42, 52 and 62
Is operated to retract the fusing head 40, the upper blade 50 and the sandwiching plate 60 upward, and the manufacturing of the gusset bag 10 (see FIG. 4) is completed.

(Fourth Embodiment) First, the heater temperature of the fusing head 40 is set low so that the gusset tube 2 can be heat-sealed in the width direction thereof. And
Similar to the first embodiment, the gusset tube 2 is positioned, the piston / cylinder mechanism 42 is operated, and the gusset tube 2 is heat-sealed over the entire width direction.

Then, 0.1 to 1.0 seconds after the start of the operation of the piston / cylinder mechanism 42, the piston / cylinder mechanism 52 is operated to cut the heat seal end of the gusset tube 2 over the entire width direction. (At this time, a new tip opening 2a is formed in the gusset tube 2). Then, the piston / cylinder mechanisms 42 and 52 are operated to retract the fusing head 40 and the upper blade 50 upward, and the manufacture of the gusset bag is completed.

As described above, the bag manufacturing apparatus 1 according to the present embodiment.
Further, according to the method for manufacturing a bag of the present invention by the bag manufacturing apparatus 1, since the fusing (or heat sealing) and the cutting of the gusset tube 2 are performed at the same time or substantially at the same time after the positioning of the gusset tube 2, the cooling as in the conventional case is performed. No process is required, and there is no deviation between the heat sealing position and the cutting position due to the movement between the heat sealing process and the cutting process. It is possible to stably manufacture the gusset bag 10 with the cut ends uniformly at a high speed.

The bag-making apparatus according to the present invention is not limited to the bag-making apparatus 1 of the above-described embodiment, and its size, shape, etc. can be appropriately changed without departing from the object of the present invention. .

For example, in the bag making apparatus 1 of the above embodiment, the sandwiching plates 60 and 61 are used as the separating means, but as other separating means, for example, negative pressure suction, air blow, take-off rolls, etc. are separated. Means can also be employed.

Further, in the bag making apparatus 1 of the above-mentioned embodiment, the upper blade 50 and the lower blade 51 in which both the lower edge 50a and the upper edge 51a are flat are adopted.
By adopting an upper blade and a lower blade in which either one or both of the lower edge of the upper blade and the upper edge of the lower blade are obliquely inclined with respect to the horizontal direction, the gusset tube 2 is moved from one end in the width direction thereof. You may make it cut | disconnect gradually. Even when the upper blade and the lower blade of such a form are adopted, the operation timing of each piston / cylinder mechanism is the same as that in the manufacturing procedure of the first to fourth embodiments. It can be set in the same manner as the timing, and the same effects as the effects of the manufacturing method of each of the above-described embodiments can be obtained.

The band-shaped tubular body used in the bag manufacturing method according to the present invention is not particularly limited as long as it is made of a thermoplastic resin. For example, high-density polyethylene, high-density polypropylene, low-density polyethylene or the like can be used. Those made of thermoplastic resin are preferably used. Further, the form of the tubular body is not limited to the form of the gusset tube 2 in the above-described embodiment, and a tubular form may be formed by simply winding both ends of the strip-shaped sheet in the width direction and superposing them. It can be selected and used.

[0042]

According to the bag manufacturing method and bag manufacturing apparatus of the present invention, the following effects can be achieved. According to the bag manufacturing method of the first or the second aspect, it is possible to stably manufacture a bag having a uniform cut end at a high speed.

According to the bag-making apparatus of the third aspect, the bag-manufacturing method of the present invention having the above-mentioned effects can be suitably implemented.

[Brief description of drawings]

FIG. 1 is a perspective view conceptually showing a main part of an embodiment of a bag making apparatus according to the present invention.

FIG. 2 is a perspective view showing a bag manufacturing process by the bag manufacturing apparatus.

FIG. 3 is a perspective view showing a bag manufacturing process by the bag manufacturing apparatus.

FIG. 4 is a perspective view showing an example of a bag manufactured by the bag manufacturing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bag-making device 2 Gazette tube (cylindrical body) 20 Separation part 3 Conveying means 4 Fusing means 5 Cutting means 6 Separation means 10 Gazette bag (bag) A Fusing end B Cutting end

Claims (3)

[Claims] 1. A strip-shaped tubular body made of a thermoplastic resin is conveyed in the longitudinal direction and positioned at a predetermined position, and then the tubular body is melted and cut at a predetermined length from an opening at its tip, and the fusing is also performed. The tubular body is cut slightly rearward of the end portion in the transport direction of the tubular body, and the fusing end portion and the separation portion having the cut end portions as both end portions are separated from the tubular body, and the fusing is performed at one end portion. A method for manufacturing a bag, which comprises successively manufacturing a bag having a heat-sealed portion heat-sealed by the above method and having an opening at the other end. 2. A strip-shaped tubular body made of a thermoplastic resin is conveyed in the longitudinal direction and positioned at a predetermined position, and then the tubular body is heat-sealed at a predetermined length from an opening at its tip and at the same time. The tubular body is cut at a heat-sealing end portion or slightly rearward of the heat-sealing end portion in the conveying direction of the tubular body, and the other end portion has a heat-sealing portion heat-sealed by the fusing at the one end portion. A method of manufacturing a bag, characterized in that a bag having an opening is sequentially manufactured. 3. A transport means for transporting a strip-shaped tubular body made of a thermoplastic resin in the longitudinal direction and positioning it at a predetermined position, and a tubular body having a predetermined length from the tip end opening of the tubular body. A fusing means for fusing in the width direction, a cutting means for cutting the tubular body in the width direction slightly rearward of the fusing end in the conveying direction of the tubular body, and a cutting means arranged between the fusing means and the cutting means. A bag making apparatus comprising: a fusing end portion and a separating means for separating a separation portion having both ends at the cutting end portion.