JPH03623A - Mouth closing method and device for packaging bag - Google Patents

Abstract

PURPOSE:To make it possible to close the mouth of a bag automatically by a method wherein after a commodity is placed in a bag equipped with a mouth closing piece, the mouth closing piece is folded on the surface of the bag to close the opening, and at the same time, an adhesive tape is placed over the bent end of the mouth closing piece and the surface of the bag, to be crossing between them. CONSTITUTION:A bag 1 is formed by double folding and lapping a resin film, and a mouth closing piece 4 is formed by extending either one film, back or front, from an opening edge 3, and on a supporting piece 7, which is formed by further extending the film from the mouth closing piece 4, holes to insert supporting rods 8, 8 are bored. Under a condition where a large number of bags 1 are accumulated, the opening edge 3 of the bag 1 on the top is opened, and after a commodity is placed, the bag 1 is pulled to the direction of a bottom part 2. While moving the bag 1, which is equipped with the mouth closing piece 4 separated from the supporting piece 7 by a separation line 9, on a conveyor, the mouth closing piece 4 is erected and bent to close the opening. Then, an adhesive tape 11 is placed from a front end 5a to a rear end 6a of the bag 11 in the carrying direction over a bent end 4a of the mouth closing piece 4 and the surface of the bag 1 to be crossing between them, and the adhesive tape 11 is cut (11a) in the vicinity of the rear end 6a.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for loading products into a bag provided with a bendable sealing piece for sealing the opening, and then sequentially separating the cough bags at intervals. While transporting the bag, the sealing piece is folded onto the surface of the bag to seal the opening, and the adhesive tape, which is continuously fed out, is stretched across the bent end of the sealing piece and the surface of the bag. The present invention relates to a method and apparatus for automating these sealing operations when pasting the seals.

[Conventional technology and issues]

Conventionally, after products are loaded into a bag, the opening of the bag is sealed by fusing and welding.

By the way, in order to make it easier for the purchaser of the product to open the bag, conventionally, the opening and side portions of the bag to be melted and welded are constructed with a sealing piece, and the sealing piece is attached to the bag using double-sided adhesive tape. It is removably attached to the surface of the body. This is because the purchaser of the product can open the bag by peeling off the sealing piece from the surface of the bag.

However, when based on the above-mentioned structure, one bag becomes expensive, which poses a problem that there is a limit to cost reduction.

When making a lid and bag, two types of films are required: a synthetic resin film that constitutes the main body of the bag, and a synthetic resin film that constitutes the sealing piece, and the former band-shaped film is bent to form the bag. A bag side part constituting the height of 9 and a bag side part having a shorter height are formed, and the latter strip film is superimposed on the bag side part so as to overlap at a predetermined position.
This is because it is necessary to fuse and weld both films at intervals in the longitudinal direction of the band.

Further, the sealing piece must be provided with double-sided adhesive tape in advance, and the double-sided adhesive tapes available on the market are extremely expensive.

Furthermore, in order to automate the sealing after product loading, the sealing piece must be adhered to the surface of the bag with the double-sided adhesive tape during bag manufacturing or at least during product loading. It is extremely difficult to automate this, and even if possible, it would require complex equipment.

[Means to solve the problem]

The present invention provides a method and apparatus for sealing a packaging bag that solves the above problems.

The method for sealing a packaging bag according to the present invention includes the following steps: loading a product into a bag provided with a bendable sealing piece for sealing the opening; a step of intermittently conveying the body in a direction parallel to the opening edge at sequential intervals; a step of folding the sealing piece onto the surface of the bag body to seal the opening of the bag body; and a step of continuously feeding out the body. affixing an adhesive tape from the front end to the rear end of the bag in the transport direction, spanning the bent end of the sealing piece and the surface of the bag; applying the adhesive tape to the rear end of the bag in the transport direction; A step of cutting the adhesive tape in the vicinity: When cutting the adhesive tape, the feeding end of the adhesive tape formed by cutting and the front end of the subsequent bag body in the conveyance direction are relatively aligned with each other. The point is that it includes a step of moving in a direction closer to each other.

In addition, the device for sealing a packaging bag according to the present invention has a working part for loading products into a bag provided with a bendable sealing piece for sealing an opening; a conveyor that intermittently conveys the bag in a direction parallel to the opening edge at intervals; an upright guide body that is erected to hold the sealing piece upright along the conveyance path of the bag; and the raised sealer. a bending guide body provided above the conveyance path for bending the piece onto the surface of the bag body; an adhesion roll that freely rotates in contact with the bag being conveyed so as to adhere the adhesive tape; and a cutting means that cuts the adhered adhesive tape near the rear end of the bag in the conveyance direction; The present invention further comprises a spacing adjustment device for advancing a subsequent bag on the conveyor from a conveying position when the cutting means is activated.

〔Example〕

Preferred embodiments of the present invention will be described in detail below based on the drawings.

[Bag structure and product packaging method]

As shown in FIGS. 16 to 19, the bag 1 used in the present invention is made by, for example, folding and polymerizing one band-shaped synthetic resin film in half at the bag bottom 2, and opening either the front or back of the film.
A sealing piece 4 is provided extending from t3, and the bag body 1 is formed by welding the half-folded and polymerized film at intervals in the longitudinal direction of the belt, thereby welding both side edges 5 and 6. further includes an extended holding piece 7.

A hole is formed in the holding piece 7 through which a holding rod 8.8, which will be described later, can be inserted, and the holding piece 7 and the sealing piece 4 are configured to be easily separated via a separation line 9 such as a perforation or a groove line. are doing. Therefore, such a bag l is extremely easy to manufacture.

Moreover, it is inexpensive.

When loading products into the bags 1, the holding pieces 7 are inserted through the holding rods 8, 8 as shown in FIG.
Open the opening edge 3 and load the product into the bag l manually or by automatic equipment. After loading the product, the bag body 1 is pulled in the direction of the bottom 2, and while the holding piece 7 is held by the holding rod 8.8, the separation line 9 is separated, and the bag is provided with the sealing piece 4 separated by one. The body 1 is transferred onto a conveyor 10, which will be described later.

When the bag 1 is intermittently conveyed by the conveyor 10, the sealing piece 4 is raised up as shown in Figure 17, and then the sealing piece 4 is placed on the surface of the bag 1 as shown in Figure 18. It is bent and the opening is sealed.

Thereafter, as shown in FIG. 19, the adhesive tape 11 is continuously fed out from the front end 5a of the bag 1 in the transport direction to the rear end 6a, and straddles the bent end 4a of the sealing piece 4 and the surface of the bag l. Then paste it and after pasting it.

The adhesive tape 11 is cut 11a near the rear end 6a of the bag 1 in the transport direction. By this cutting, the adhesive tape 11 forms a new feeding end 11b.

This feeding end tib is attached to the subsequent bag body being conveyed in the same manner as described above.

The adhesive tape 11 is similar to so-called cellophane tape and is inexpensive.

[First embodiment] (Configuration of Ia conveyor) As shown in FIGS. 1 and 2, the conveyor IO has nine driving wheels 12 that are driven and rotated intermittently and driven wheels 13 that are idled.
It consists of an endless belt wound around the belt, and drive pieces 14 located in the transverse direction of the belt are fixed to the outer peripheral surface at predetermined intervals in the longitudinal direction of the belt. The distance between the driving pieces 14 is set to be larger than the width of the bag body 1.

A conveyance table 15 is installed above the conveyor 10, and the conveyance table 15 has a conveyance window hole 1 through which the driving piece 14 of the conveyor 10 can be inserted upward and run.
6 have been established.

The amount of protrusion of the driving piece 14 above the conveyance table 15 is set to be approximately the same as or slightly lower than the bulk of the bag 1 in a product-loaded state that is slid on the conveyance table 15 and conveyed.

(Configuration of Working Unit) As shown in the second diagram, a working unit 17 for loading products into the waiting bag 1 is arranged on the upstream side of the carrying table 15 in the carrying direction. This working section 17 is as shown in the third figure.

A product placement table 18 installed horizontally or with a gentle slope;
The transport table 1 is tilted more steeply than the product placement table 18.
It has a bag mounting table 19 facing toward 5. The product placement table 18 faces the nine-bag placement table 19 and has a guide tongue 20 extending therefrom, and expandable/retractable guide arms 21 and 21 are provided on both sides of the guide tongue 20.
The tip 21a of the guide tongue 20 is extended beyond the guide tongue 20. Guide arm 21.21 is.

It is rotatable in the expansion and contraction directions by a pivot 22, and is normally urged by a spring 23 in a direction in which the guide arm 21.degree. 21 approaches, and is in contact with the side edge of the guide tongue piece 20.

Further, as shown in FIG.
is formed, and air from a blower 25 is pumped into the air flow path 24. Further, as shown in FIGS. 2 and 3, a holding rod 8.8 for the bag 1 mentioned above is erected on the bag mounting table 19 near the guide tongue piece 20. By inserting the holding piece 7 of the bag 1 into the holding rod 8.8, a large number of bags 1 are placed on the bag mounting table 19.
Laminated and held. The opening edge 3 of the uppermost bag body 1 is opened by the air blown out from the guide tongue piece 20 through the air flow path 24, so that the product can be moved from the product placement table 18 to the guide tongue piece 20. The product is easily loaded into the bag 1 by sliding it through the bag 1.

The loading operation of the product is shown in FIGS. 4 to 6. That is, with the bag 1 opened by air on the bag placement table 19 as described above, the product 26 shown in FIG. 4 is placed between the pair of guide arms 21 and 21 from the product placement table 18. When pushed in, both guide arms 21 and 21 expand against the spring 23 as shown in FIG. to be loaded. So, after loading the product.

When the bag 1 is pulled toward the conveyance table 15 as described above, the separation line 9 is separated as shown in FIG. 6, and the two bags 1 are slid down from the bag placement table 19 toward the conveyance table 15. .

(Illllll Conveyance Machine Section) As shown in FIGS. 1 to 3, the bag 1 that has been slid down is accommodated in the conveyance machine section 27 on the conveyance table 15. This special transport unit 27 is.

A rectangular cylindrical box 28 with an open top and bottom has a size and shape that can accommodate the bags 1 loaded with the products in a vertically stacked manner, and is installed facing the transport window 16 of the transport table 15. Passage windows 29 matching the conveyance window holes 16 are provided on both side walls. This passage window 29, as shown in FIG.
It is provided with a notch 29a through which an upright sealing piece 4, which will be described later, passes. Therefore, the plurality of bags 1 stacked and housed in the box 28 are sent out through the passage window 29 by receiving the drive piece 14 of the conveyor 10 one after another, starting from the bag 1 in the lower layer.

The box 28 preferably has a receiving wall 30 that stands up the sealing piece 4 of the bag 1 that falls and is accommodated in the box.
In addition, storage guides 31 are provided on both side walls of the box 28 and extend upward and are inclined.

(!11 Configuration of feed path and standing guide body) Figures 2 and 8
As shown in the figure, the bag 1 being sent out and conveyed by the IM conveyance unit 27 is held with the sealing piece 4 upright by the upright guide body 32. That is, the upright guide body 32 constitutes an upright wall provided in parallel with an example of the conveyance window hole 16 in order to hold the sealing piece 4 erected in the box 28 in an upright state during conveyance. On the other hand, a route regulating plate 33 is provided on the other side of the conveyance window hole 16, and a conveyance route 34 is defined between the route regulating plate 33 and the upright guide body 32. Preferably, the route regulating plate 33 is attached to the Wi feeder table 15 so as to be adjustable in forward and backward movement using a position adjuster 35, and by adjusting the forward and backward movement of the route regulating plate 33, the width of the conveying route 34 can be changed. It is configured to be possible. Therefore, according to the present invention, when a bag 11 of a different size, for example, a bag 1 shorter in height than the bag 1 shown in FIG. 1, is loaded with products and sealed.

The conveying path 34 can be made narrower by advancing the path regulating plate 33 using the position adjusting tool 35. At this time, the box 28 of the special conveying unit 27 has a different size to match the size of the bag body 1. You can exchange it for something.

(Configuration of bending guide body) The bag body 1 is transported with the sealing piece 4 held upright by the upright guide body 32 in a secondary state.

As shown in FIGS. 2 and 9, the sealing piece 4 is bent onto the surface of the bag body 1 by the bending guide body 36. That is,
This bending guide body 36 includes an inclined guide portion 36a that is inclined in both the vertical direction and the width direction, and a tilted guide portion 36a that is inclined in both the vertical direction and the width direction in order to gradually bend the upright sealing piece 4 while it is being conveyed so that it lies down. It also includes a bent holding portion 36b extending over the bag 1 to hold the sealing piece 4 in a bent state close to the surface of the bag 1.

Incidentally, in the folded state, the sealing piece 4 has its bent end 4a extended from the bent holding portion 36b.

(Structure of Adhesive Tape) As shown in FIG. 1, the adhesive tape 11 constitutes a covering tape 38 whose adhesive surface is covered with a release tape 37,
After the covering tape 38 is fed out from the freely rotatable feeding section 39 wound into a roll, the adhesive tape 11 and the release tape 37 are separated by the pen roller 40.The separated release tape 37 is then wound up. It is wound up on a roll 41. The adhesive tape 11 is fed out by a guide roller 42 with its adhesive surface directed toward the bag 1 that is being transported.

It is guided to a pasting roll 43, which will be described later.

(Configuration of sticking roll) The sticking roll 43 straddles the bent end 4a of the two sealing pieces 4 and the bag surface above the bag body 1 which is transported with the sealing piece 4 bent. It is arranged so that it can freely rotate against the bag body 1 along the way.

Preferably, the spindle of the pasting roll 43 is vertically movable, and the pasting roll 43 is made of metal or the like and is placed in a stack so that it contacts the bag 1 being transported with some pressure. It is configured. Therefore, the bag 1 is attached to the adhesive roll 43 with the feeding end of the adhesive tape 11 adhered to the front end position of the bag 1 in the conveyance direction by an adhesion auxiliary means 44 to be described later.
When the bag 1 is fed downward, the adhesive tape 11 is adhered to the bag 1 being transported from the front end to the rear end in the transport direction, spanning the bent end 4a of the sealing piece and the surface of the bag.

(Configuration of Cutting Means) The time when the adhesive tape 11 is pasted by the pasting roll 43 and the sealing of the bag body 1 is completed corresponds to the time when the intermittent feeding of the conveyor 10 is stopped. A cutting means 45 is disposed near the rear end of the stopped bag 1 in the transport direction, and the adhesive tape 11
can be cut. The cutting means 45 includes a blade 46 consisting of a cutter blade or a fusing blade heated by a heater.
The blade 46 is vertically movable by a cylinder 47. Therefore, by lowering the blade 46 using the cylinder 47, the adhesive tape 11 is cut along the rear end of the bag 1 in the transport direction.

(Configuration of interval matching device) At the same time as or prior to the cutting, the following bag body 1 is
It is moved forward from a predetermined conveyance position by a spacing alignment device 48 shown in the second figure. That is.

The spacing alignment device N48 includes a pusher 49 that extends from outside the VI feed path 34 and is positioned at the rear end in the conveying direction of the following bag 1, a cylinder 50 that moves the pusher 49 forward and backward, and a cylinder 50 that moves the pusher 49 forward and backward. Including pusher 4
9 is provided with an advancing/retracting means 51 such as an electric motor that rotates the conveyance path 34 to move it in and out of the conveyance path 34. Therefore, when the succeeding bag 1 is conveyed to a predetermined position and stopped, when the pusher 49 is advanced into the conveying path 34 by the advancing/retreating means 51 and the pusher 49 is advanced by the cylinder 50, the cough bag 1 is moved from the preceding cough bag 1. It is moved forward until it comes into contact with the drive piece 14. Therefore, the distance between the preceding bag 1 (the bag to which the adhesive tape 11 has already been attached) and the following bag 1 is narrowed.

(Structure of adhesion auxiliary means) After the following bag 1 is advanced by the spacing alignment device 48, the adhesive tape 11 is adhered to the upper surface of the front end of the bag 1 in the transport direction by the adhesion auxiliary means 44. As shown in the first diagram, the auxiliary means 44 has a lining made of an elastic material such as sponge formed on the lower surface and arranged above the front end of the bag 1 in the conveyance direction, and is movable up and down by a cylinder 52. . Therefore, when the adhesion assisting means 44 is lowered by the cylinder 52.

The adhesive tape 11 is pressed down, and the bent end 4a of the sealing piece is pressed against the lower bag body 1 at the front end in the conveying direction.
and glue it across the surface of the bag.

(Functions of the spacing alignment device, adhesion auxiliary means, and cutting means) The functions of sequentially pasting the adhesive tapes 11 onto the bags 1 during transportation are shown in FIGS. 10 to 12. Figure 10 shows
A state is shown in which the adhesive tape 11 has been pasted to the preceding bag 1, the conveyor 10 is intermittently stopped, and the following bag 1 is advanced by the spacing alignment device 48.

From this state, as shown in Figure 11, the cutting means 45 and the adhesion assisting means 44 are operated simultaneously. Therefore, the adhesive tape 11 is cut near the rear end of the preceding bag 1 in the conveying direction, and at the same time, the cut end forms a new tape feeding end, and at the same time, the feeding end of the adhesive tape 11 is connected to the trailing end by the adhesion assisting means 44. It is attached to the bag body 1 of.

Conveyor 10 continues to be driven intermittently.

When the succeeding bag 1 is conveyed by the driving piece 14, the bag 1 is transported by the adhesive tape 1 as shown in the twelfth figure.
The adhesive tape 11 is fed under the adhesive roll 43 while pulling the adhesive tape 11, and while passing through the adhesive roll 43, the adhesive tape 11 is attached to the bag body 1.
It is pasted from the front end to the rear end in the conveyance direction.

In this way, the preceding bag body 1 and the following bag body 1 are connected to the driving piece 1.
The distance between the tapes 4 and 4 is narrowed, and the adhesive tape 11 is cut in this state.

Moreover, since the feeding end of the adhesive tape 11 formed by cutting is adhered to the front end of the subsequent bag 1 in the conveying direction by the adhesion assisting means 44, sealing with the adhesive tape can be performed continuously.

The cutting means 45 and the adhesion assisting means 44 may be operated almost simultaneously as described above, or the cutting means 45 may be operated after the adhesion assisting means 44 is operated.

[Second Embodiment] In the second embodiment shown in FIGS. 13 to 15, the spacing adjustment device of the first embodiment is not provided, and instead, an adhesive tape retreating means 53 is provided. There is. Further, the adhesion auxiliary means 44 is installed so as to be located above the front end of the bag 1 in the conveyance direction at the conveyance position where the following bag body 1 is engaged with the drive piece 14 when the conveyor 10 is intermittently stopped. has been done. The other configurations are the same as those of the first embodiment.

The adhesive tape retraction means 53 is provided with a portal-shaped swing arm 54 that hangs down under its own weight around a freely rotatable guide roller 42 around which the adhesive tape 11 is wound.
An adhesive tape 11 is wound around the adhesive tape 11, and the unwinding end of the adhesive tape 11 is brought to a sticking roll 43. Therefore, the bag l
While conveying the adhesive tape 11, the swing arm 54 is moved forward by the tension of the adhesive tape 11 (Fig. 13), but when the adhesive tape 11 is cut and loses its tension, the swing arm 54 is moved back in a drooping manner (Fig. 13). Figure 14).

As shown in the 13th figure, after the preceding bag l is sent under the pasting roll 43 and transferred, when the conveyor 10 is stopped intermittently, the cutting means 45 is moved as shown in the 14th figure.
When the adhesive tape 11 is cut near the rear end of the bag 1 in the conveyance direction, the swing arm 54 moves back, and the unwinding end of the adhesive tape 11 is moved back and positioned at the front end of the following bag 1 in the conveyance direction. do. In this state, the adhesion auxiliary means 44 is operated to adhere the fed-out end of the adhesive tape 11 to the front end of the subsequent bag body in the conveyance direction. Continuing with conveyor 10
When operated intermittently, the bag body 1 is fed into the adhesive roll 43 while pulling the adhesive tape 11, and the adhesive tape 11
is glued across the rear end in the transport direction.

Complete the seal.

〔Effect of the invention〕

According to the present invention, the bag itself can be constructed at a lower cost than a bag equipped with a conventional double-sided adhesive tape, and after loading products into such a low-cost bag, the sealing piece is removed. This has the advantage that the folding and sealing with adhesive tape can be performed automatically.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view showing an apparatus according to a first embodiment of the present invention, FIG. 2 is an open plan view, FIG. FIG. 3 is a plan view showing the working section in a state before loading products. FIG. 5 is a plan view showing the working section during product loading, FIG. 6 is a plan view showing the working section after product loading, and FIG. Figure 8 is an enlarged vertical cross-sectional view showing the upright guide body, Figure 9 is an enlarged vertical cross-sectional view showing the bending guide body, Figure 10 is a vertical cross-sectional front view showing the operating state of the distance matching device, and Figure 11 is a cutaway view. FIG. 7 is a vertical cross-sectional front view showing the operating state of the means and the adhesion auxiliary means. FIG. 12 is a vertical cross-sectional front view showing the operating state of the pasting roll;
FIG. 13 is a vertical cross-sectional front view showing the main parts of the device according to the second embodiment of the present invention, FIG. 14 is a vertical cross-sectional front view showing the operating state of the adhesive tape retreating means in the second embodiment, and FIG. FIG. 3 is a longitudinal cross-sectional front view showing the operating state of the sticking roll in the same embodiment. FIG. 16 is a perspective view showing a bag used in the present invention. Fig. 17 is a perspective view showing the bag with the product loaded and the closure piece erected, Fig. 18 is a perspective view showing the closure piece bent. FIG. 3 is a perspective view showing a state in which the surface of the bag is sealed with adhesive tape. 1... Bag body, 3... Opening edge, 4... Sealing piece +4a
...Bent end, 10...Conveyor, 11...Adhesive tape. 14... Drive piece, 15... Conveyance table, 16...
・Transport window hole, 17...Working section, 26...Product, 27
... Transport special equipment section, 32... Standing guide body, 34...
- Conveyance path, 36... Bending guide body, 43... Adhesive roll. 44... Adhesion auxiliary means, 45... Cutting means, 48.
. . . Spacing alignment device, 53 . . . Adhesive tape retraction means.

Claims (1)

[Claims] 1. Loading the product into a bag provided with a bendable sealing piece for sealing the opening; loading the bag sequentially at intervals in a direction parallel to the opening edge; a process of intermittently conveying;
a step of folding the sealing piece onto the surface of the bag to seal the opening of the bag; bending the sealing piece from the front end to the rear end of the bag in the conveyance direction of the continuously fed adhesive tape; the adhesive tape is pasted across the edge and the surface of the bag body; and the process of cutting the adhesive tape near the rear end in the conveying direction of the bag body; 1. A method for sealing a packaging bag, comprising the step of moving the feeding end of the adhesive tape and the front end of the subsequent bag in the conveyance direction toward each other in a direction relatively close to each other. 2. A patent characterized in that when cutting the adhesive tape near the rear end of a bag in the conveying direction, the succeeding bag is advanced from the conveying position so as to narrow the distance between the bag and the succeeding bag. A method for sealing a packaging bag according to claim 1. 3. When cutting the adhesive tape near the rear end of the bag in the conveyance direction, the feeding end of the adhesive tape formed by cutting is moved to the front end of the subsequent bag in the conveyance direction. A method for sealing a packaging bag according to item 1. 4. A working part (17) for loading the product (26) into the bag (1) equipped with a bendable sealing piece (4) for sealing the opening.
); a conveyor (10) that intermittently conveys the bags in a direction parallel to the opening edge (3) at sequential intervals; and a conveyor (10) that holds the sealing piece upright along the bag conveyance path (34); a bending guide body (36) provided above the conveyance path so as to bend the raised sealing piece onto the surface of the bag body;
An adhesive tape (11) that is continuously fed out and freely rotates against the bag being transported so as to straddle the bent end (4a) of the sealing piece and the surface of the bag. Roll (43)
and; a cutting means (45) for cutting the adhered adhesive tape near the rear end of the bag in the conveying direction; and when the cutting means is activated, the subsequent bag is advanced from the conveying position on the conveyor. 1. A packaging bag sealing device comprising a gap matching device (48). 5. Adhesion auxiliary means (provided above the subsequent bag body advanced by the spacing alignment device) for pressing the feeding end of the adhesive tape formed by cutting by the cutting means against the front end of the bag body in the conveying direction. 44).The packaging bag sealing device according to claim 4, further comprising: 44).