JPS61244708A - Manufacture of bag for packaging - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention involves sealing the sides of a long heat-welded sheet material by folding it vertically, and then sealing it horizontally to form a pocket. The present invention relates to a method of manufacturing a packaging bag, in which a bag is filled with liquid or powder, and after filling, the upper end of the pocket is sealed to continuously package a certain amount of the contents.

[Conventional technology]

In conventional manufacturing methods of this type, predetermined portions of the sheet material are laterally sealed by passing the heat-welded sheet material between a pair of rotary sealing rollers.

[Problem to be solved]

With conventional sealing means, if the heat-welded sheet material is transferred at a speed higher than a certain speed, the sealing time will be shortened and the seal will be defective, so the transfer speed of the flexible sheet material must be kept below a certain speed. There wasn't. In particular, when the contents are liquid, when filling the pocket with liquid, the liquid splashes and drips into the next sealed area (i.e. the top edge of the pocket and the bottom edge of the next one), and High 1 (2
Sealing (thermal welding) in a short time at temperatures between 00°C and 250”C
The drop then expands and causes a seal failure. When the contents are liquid, it is necessary to take a long sealing time at a relatively low temperature (around 150'C) to prevent sealing defects. However, in order to lengthen the sealing time, the speed at which the sheet material is fed must be slowed down, which unavoidably reduces production efficiency.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for manufacturing a packaging bag that can transport heat-welded sheet material at a higher speed while ensuring reliable sealing and improve production efficiency.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention seals the sides of a long heat-sealable sheet material while folding it lengthwise, and then seals it laterally to form a pocket. This method involves filling the pocket with contents such as liquid or powder, sealing the upper end of the pocket after filling, and continuously packaging a certain amount of contents. In order to perform sealing, a pair of rotary sealing rollers with protrusions around the periphery are attached to a vertically movable bracket, and this bracket presses the sheet material with the protrusions of both rollers.The flexible sheet material is transferred downward during sealing. It follows this process and descends, slows down the rotational speed of the roller during the descent to prolong the sealing time, rises again, and repeats the process of descending while sealing the upper end of the pocket and the next lower end.

〔Example〕

Preferred embodiments of the present invention will be described below with reference to the drawings.

A folding means 3 for vertically folding the elongated heat-welded sealing material 2 on the frame 1; and a transporting means 4 having a means for transporting the vertically folded sheet material 2 downward and sealing the side surfaces thereof. , and a sealing means 5 for applying a seal in the lateral direction of the sheet material 2 whose side surfaces have been sealed by the transporting means 4 and has been transported downward. After filling the pocket whose bottom is sealed at the sealing means 5 with the contents from the supply pipe 6 for supplying the contents, the top end of the pocket is sealed. Since the filled packaging bag 10 is continuously molded, the upper end of one pocket becomes the lower end of the next pocket. Although the sealing means for the side surface of the long sheet material 2 is provided in the transfer mechanism 4, it may be provided at any location before reaching the sealing means 5.

As shown in the second factor, the sealing means 5 includes a pair of rotary sealing rollers 51 and 52, and these pair of rotary sealing rollers 51 and 52 are rotatably attached to the bracket 7. A pair of sealing rotary rollers 51.52 have protrusions 51A and 518.52A for sealing, respectively.
, 52B, and when these protrusions 51A and 52A or 51B and 52B come into contact, the sheet material 2 crimped and held therebetween is sealed laterally.

The seal width is about 15n. The bracket 7 is provided with an adjustment member 71 for adjusting the distance between the pair of sealing rotary rollers 51 and 52. This bracket 7 is attached to the back plate 11 of the frame 1 so as to be movable up and down. A slide rail 12 is provided on the back side of the back plate 11, and a slider 13 fixed to an arm 15 projecting from a long hole 14 formed in the back plate 11 slides on the slide rail 12. Connecting rod 1 to this slider 13
6 is pivotally connected, and the lower end of this connecting rod 16 is connected to the operating rod 17.
It is pivoted to. One end of the operating rod 17 is attached to the frame 1 with a pin 17A to serve as a pivot point. The tip of the operating rod 17 is in contact with the cam 18. When the rotating shaft 19 provided at an eccentric position of the cam 18 rotates, the tip of the operating rod 7 moves up and down due to the action of the cam 18. When the tip of the operating rod 17 moves up and down, the connecting rod 1
6 moves up and down, and the slider 13 also moves up and down accordingly. When the slider 13 moves up and down, the arm 15 and bracket 7 fixed to the slider 13 move up and down.

One sealing rotary opening 52 constituting the sealing mechanism 5
A gear 20 having the same diameter as the roller 52 is provided, and a chain 21 is connected to the gear 20. chain 21
The chain sprocket 22 is connected to a drive source via a speed reduction mechanism or the like, and a plurality of gears 20A and 20B are meshed between the chain sprocket 22 and the gear 20. The gear 2OA is rotatably attached to a rocking plate 23, and the tip of the rocking plate 23 is always pulled in the direction of pulling the chain 21 by a spring 24. When the bracket 7 is lowered, the chain 21 hooked to the gear 20 is loosened, so that the rotational speed of the roller 52 is slowed down. When this delay occurs, the protrusions 51A and 52A
(or 51B and 52B) are facing each other,
This means that the sealing time can be extended. loose chain 2
1 is pulled by the spring 24 and the gear 20 is placed under tension again. At this time, the tension of the spring 24 is adjusted so that the bracket 7 has finished descending and is starting to rise. It is better to design the force. Due to the presence of the spring 24, the chain 21 will not come off the gear 20, but when the bracket 7 is lowered, the force of the chain 21 that rotates the gear 20 will be loosened, and the rotation of the roller 52 may be momentarily stopped or the speed may be slowed down. is necessary. The roller 52 (the same goes for the roller 51 which is a driven roller) is designed to slow down only when the protrusions 51A, 518, 52A, and 52B face each other during one rotation, for example, assuming that the roller 52 rotates once per second. In other words, it is designed to increase the circumferential speed.

That is, the rotational speed of the roller 52 when the protrusions 51A and 52A and 51B and 52B are in a state where they are facing each other and can be sealed may be made slower than that of the roller 52 in other states. One means for this purpose is the mechanism shown in FIG. 5, but the mechanism is not limited to the one shown in the figure. For example, the O-ra 52 and the drive source are connected via a deceleration mechanism or the like, and the deceleration mechanism is controlled by a microcomputer or the like. It is also possible to partially change the circumferential speed of the roller 52, and various other means can be considered.

In order to reduce the load associated with vertical movement of the bracket 7, it is desirable that the bracket 7 be made of a material that can be made as light as possible, such as aluminum. In addition, the bottle 1 serving as the fulcrum of the operating rod 17 shown in FIG.
It is also possible to design the position of 7A to be freely changed. By changing the position of the pin 17A, which serves as the fulcrum, it becomes possible to change the vertical stroke of the bracket 7 very easily. By increasing the time required for lowering the bracket 7, the sealing time can be further increased. The relationship between the sealing time, the length and pitch of the bag in the feeding direction, and the length of the finished bag is determined by the rollers 51 and 52.
When rotates at a constant circumferential speed, 5 Q sea Bag-making speed (number of bags manufactured per minute) Pitch (n) From the above equation, the protrusions 51A and 52A of the rollers 51 and 52, 5
The time during which sheet material 2 is held between 1B and 528 can be calculated. For example, when the pitch is 100n, it becomes -X--0,15 (seconds), and when the pitch is 5On, it becomes -X--0,3 (seconds). Depending on the contents to be filled, the sealing time may be 0.
In cases where there is a risk of producing defective products in 15 seconds, by applying the method of the present invention, the sealing time can be increased without changing the bag making speed.

Note that the member indicated by the symbol @25 in FIG. 4 is a guide member. Furthermore, in FIG. 1, two sheet materials are sealed at the same time, but it is also possible to seal one sheet material or three or more sheet materials at the same time.

〔effect〕

As explained above, according to the present invention, in order to perform lateral sealing, a pair of rotary sealing rollers having projections on the circumferential surface are attached to a vertically movable bracket. When sealing the sheet material, it descends following the flexible sheet material that is transferred downward, and when it descends, the rotation speed of the roller is slowed down to prolong the sealing time, and it rises again to form the upper edge of the pocket and the lower edge of the next one. Since it descends while sealing the desired area, even if sufficient time is taken for sealing, the sheet material itself can be transported at the same speed or faster than before, eliminating the risk of sealing defects and reducing the overall It became possible to increase production volume.

[Brief explanation of drawings]

Fig. 1 is a schematic front view showing a preferred embodiment of the present invention, Fig. 2 is a sectional view of the sealing mechanism, the third factor is a plan view of the sealing mechanism, and Fig. 4 is seen from the direction of the arrow ■ in Fig. 3. The schematic diagram and FIG. 5 are schematic explanatory diagrams showing an example of a driving means for the sealing rotary roller. 1...Frame, 2...Long thermal welding sheet material, 5...
・Sealing mechanism, 7...Bracket, 51.52...Rotating roller for sealing, 51A・
51B/52A/52B...Protrusion for sealing.

Claims (1)

[Claims] 1. A long heat-welded sheet material is folded vertically and sealed on the sides, then sealed horizontally to form a pocket, and this pocket is filled with contents such as liquid or powder. , a method for manufacturing a packaging bag that seals the upper end of the pocket after filling to continuously package a certain amount of contents, the method comprising: a pair of sealing rotary rollers having protrusions on the circumferential surface for lateral sealing; is attached to a vertically movable bracket, and this bracket descends following the flexible sheet material that is transferred downward during sealing, which presses the sheet material with the protrusions of both rollers, and slows down the rotational speed of the rollers as it descends. A method for manufacturing a packaging bag, characterized by taking a long sealing time, and repeating the steps of rising again and lowering while sealing the upper end of the pocket and the next lower end.