JPH07100973A - Mechanism and method for forming opening face in bag making process of gusset bag with zipper - Google Patents

Abstract

PURPOSE:To automate manufacture of a gusset bag with a zipper by automatically processing a side face of a folding flute of the bag and easily sealing it. CONSTITUTION:A bag body 10 is held by a pair of jigs 33A, 33B, and the body 10 is so positioned that ends 10a and ends of sides 10B of a folding flute are disposed in a space 34 of a wedgelike section. A pair of wedge-shaped slide plates 32, 32 are introduced between end faces 10a of the body, and the pair of the plates are so slid as to separate along a direction parallel to both the flat surfaces of the body thereby to press the ends 10a and the sides 10B to oblique surfaces 33a, 33b, and slid on inner surfaces of the sides 10B to fold the ends of the sides 10B at an outside with one point of the folding line of the flute as a base point.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gusset bag with a zipper in which a zipper for sealing is attached to a gusset bag which becomes a box-shaped container when a fold-shaped side surface portion expands when the contents are filled. The present invention relates to a bag manufacturing apparatus and a bag manufacturing method for bag manufacturing.

[0002]

2. Description of the Related Art Conventionally, a flat type having a zipper 2 as shown in FIG. 18 for accommodating foods such as tea, coffee, candy, etc., which must be sealed and stored because they do not like moisture. The seal bag 1 is used.

In this conventional zipper-equipped seal bag 1, the upper and lower edges 1a, 1b and both side edges 1c of the two sheet materials 1A, 1A that have been superposed are fused by a heat sealing method. , It is designed to seal the filled contents.

When the contents are taken out, the zipper-equipped sealing bag 1 is opened by cutting the lower side of the sealed upper edge 1a, and after opening, the contents are taken out by opening. The inside is hermetically sealed by the zipper 2 fused to the inner peripheral edge of the opening.

Further, as shown in FIG. 19, folding folds 3A are formed on both sides of the folds 3A, and when the folds 3A are filled with contents, the folding folds 3A expand to form a box-shaped container, that is, a so-called "town". There is known a gusset bag 3 provided with.

[0006]

The conventional zipper-equipped seal bag 1 of FIG. 18 is widely used because it can maintain its hermeticity even after being opened.
Since it is a so-called four-sided sealing bag in which 1A is overlapped and its four sides are heat-sealed, its thickness is thin, its internal capacity is small, and its self-supporting property is also lacking.

For this reason, the gusset bag 3 having the folding capacity 3A as shown in FIG.
In addition, it is strongly desired that a zipper be attached so that the hermeticity can be maintained even after opening.

However, the folding fold 3A as shown in FIG.
When a zipper is attached to the gusset bag 3 having a zipper to manufacture a gusset bag with a zipper, in the manufacturing process, a process of folding the folds 3A when the zipper is attached, a sealing process around the zipper attachment part, and the like, as shown in FIG. It is difficult to automate the manufacturing because a complicated process that is not required in the conventional manufacturing process of the four-sided sealed zipper-equipped seal bag 1 is required.

Therefore, conventionally, there is no gusset bag with a zipper attached to a gusset bag having side folds as shown in FIG. 19, and a zipper 4 is attached in advance as shown in FIG. Of the gusset bag 6 having the folds 6A.
The gusset bag manufactured by such a method has an unsightly appearance and is not easy to use. Because it is bad, it has low commercial value.

The present invention has been made to solve the above-mentioned problems in manufacturing a conventional seal bag that can be sealed even after opening. That is, the present invention, when a zipper is attached to a gusset bag having a fold-shaped side surface portion, when manufacturing a gusset bag with a zipper, which has a large internal volume, has self-reliance, and has a good appearance and high commercial value. ,
Opening surface forming mechanism in the bag making process of the gusset bag with zipper that enables automatic production of the gusset bag with zipper by automatically performing the treatment of the fold-shaped side part of the gusset bag and facilitating the sealing process And an open surface forming method.

[0011]

In order to achieve the above object, the opening surface forming mechanism in the bag making process for a gusset bag with a zipper according to the present invention has a front surface and a rear surface formed by a pair of flat portions facing each other in parallel. The side surfaces are formed by fold-shaped side surface portions that connect the side edges of both flat surface portions and are folded inside the flat surface portions, and a side surface portion is formed between the front end surfaces of both flat surface portions. The zipper is attached to the main body of the bag, the side of which is open, to form a bag-making device that makes a gusset bag with a zipper, and the tip of the fold-shaped side part is folded laterally to form the main body of the bag. An opening surface forming mechanism for forming an opening surface for sealing a portion, which faces each other with a gap and forms a wedge-shaped space in cross section by the inclined surface formed on each side surface, and the side surface is opened. The tip surface being And a pair of jigs for sandwiching and positioning the bag body so that the tip of the fold-side surface is located in the space, and the cross-sectional shape of the space formed by the pair of jigs is substantially the same. The pair of sliding plates having a wedge shape and the pair of sliding plates are advanced so as to enter between the pair of wedge-shaped sliding plates and the front end surface of the bag body portion sandwiched by the pair of jigs. After the moving plate is inserted between the tip surfaces of the bag body, the pair of sliding plates are slid in opposite directions so as to be separated from each other along a direction parallel to both flat surfaces of the bag body. When the pair of slide plates are invaded by the drive means between the front end surfaces of the bag body and are slid in the opposite directions and separated from each other, the outer edges of the slide plates are respectively separated from each other. The front end surface and the fold-shaped side surface portion of the pair of jigs. By pressing on the inclined surface and sliding on the inner surface of the fold-shaped side surface part, the tip of the fold-shaped side surface part is folded outward at one point on the fold line of the fold to form an open surface. It is characterized by doing.

In a preferred embodiment of the invention described above, there is a rubber member attached to the outer edge of the pair of sliding plates, and the rubber member is the tip surface of the bag body and the fold-shaped side surface, respectively. There is an open surface forming mechanism that presses the portion against the inclined surfaces of the pair of jigs and slides on the inner surface of the fold-shaped side surface portion.

[0013]

The opening surface forming mechanism in the bag making process for the gusset bag with the zipper is arranged and used in the bag making process of the bag making apparatus for mounting the zipper on the bag body to make the gusset bag with the zipper. .

The bag body supplied to the bag-making process of this bag-making apparatus is sandwiched between a pair of jigs and has a wedge-shaped cross section with its side surface open to the inside and a fold-like shape. It is positioned so that the tip of the side surface is positioned. Then, a pair of wedge-shaped sliding plates having a shape substantially the same as the cross-sectional shape of the void is invaded between the tip surfaces of the bag body portion sandwiched by the pair of jigs, and then the bag body portion They are slid in the opposite directions so as to be separated from each other along a direction parallel to the two flat portions.

As a result, the outer edge portions of the sliding plates are respectively pressed onto the inner surfaces of the fold-shaped side portions while pressing the tip end surface of the bag body and the fold-shaped side portions against the inclined surfaces of the pair of jigs. Is slid, and the front end portions of the fold-shaped side face portions are respectively directed to the sides of the bag main body portion and folded at one point on the fold line of the folds as a base point to form an open surface.

According to a preferred embodiment of the present invention, when the rubber plates attached to the pair of sliding plates press the fold-shaped side surface portions against the inclined surface of the jig, they feel as if they were elastic. It touches the folds as if pressing the fold surface with a human finger.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a bag body part molding apparatus 20 for molding a bag body part 10 as shown in FIG. 2 for forming a gusset bag and mounting a zipper from a single strip-shaped film.

In this bag body forming apparatus 20, the hollow body S is formed by pulling both side portions of a strip-shaped film S toward each other and adhering them together by a heater 21 as they advance.
1 is molded, and both side portions of the molded hollow body S1 are cut into rectangular shapes with a cutter 22 at equal intervals to form recesses a facing each other. Then, both sides of the hollow body S1 in which the recess a is formed are folded inside each other by the rollers 23 arranged on both sides of the hollow body S1, thereby forming a fold b. FIG. 3 is an enlarged view showing the process of forming the folds b in the hollow body S1.

The hollow body S1 thus formed with the folds b is cut by the cutter 24 at the tip portion of the recess a (chain line y in FIG. 3) to form the bag body 10. As can be seen from FIG. 2, the bag body 10 molded as described above is formed between the flat surface portion 10A which constitutes the front surface and the back surface of the gusset bag and between both side portions of the flat surface portion 10A. Although it has a fold portion 10B, the flat portion 10
Between the side portions of the front end surface 10a of A, the folds 10B are formed by the recess a formed in the molding process of the bag body 10.
Is not formed. The reason why the upper side surface of the bag body 10 is opened in this manner is to insert and install a zipper, as will be described later.

As a method for opening the upper side surface of the bag body 10, there is a cutting method as shown in FIG. 4 in addition to the above method. According to this method, the hollow body S1 'having the folds 10B' formed therein is cut at equal intervals. d
Cut along. Then, by cutting along the cutting line d, the leading end surface 10a 'of the flat surface portion 10A' and the fold portion 10
Since the tab 10C is formed by separating the tip end portion of B'from the flat portion 1C as shown in FIG.
By cutting along the cutting line e at the position where the tip surface 10a ′ of 0A ′ and the tab 10C branch, the bag body 10
Is to create.

Next, the bag body 10 produced by each of the above-mentioned methods is subjected to processes such as zipper mounting and sealing through the steps shown in FIGS. 6 and 7. FIG. 6 is a plan view showing the processing steps of the device for performing the zipper mounting and sealing processing, and FIG. 7 is a side view showing the processing steps.

In FIGS. 6 and 7, the bag main body 10 formed in the form of FIG. 2 is sent to the processing step by the belt conveyor 30 one by one. The bag main body portion 10 sequentially conveyed from the right side to the left side in FIGS. 6 and 7 by the belt conveyer 30 is arranged such that the longitudinal direction thereof is perpendicular to the conveying direction X of the belt conveyer 30. The leading end surface 10a of the flat surface portion 10A is conveyed in a state of protruding to the side portion of the belt conveyor 30.

In the first step (FIGS. 6 (a) and 7 (a)), the front end surfaces 10a of the bag main body 10 which are successively conveyed are opposed to each other by the vacuum pads 31 to suck them, and
As shown in (a), it spreads up and down.

Second step (FIGS. 6 (b), (b '), FIG. 7)
In (b) and (b ')), the expanded tip surface 1
0a, the pair of sliding plates 32, 32 are inserted from the front direction of the bag body 10 (the direction perpendicular to the conveying direction X), and the sliding plates 32, 32 are further separated from each other in the conveying direction. By expanding in parallel with X, as shown in FIG. 8 (b), a part of the tip of the fold portion 10B is bent along two ridgelines α extending from the base point P to form a triangular shape. To form an open surface 10b.

The structure for forming the opening surface 10b in the second step will be described in more detail with reference to FIGS. 11, 12 and 13, and a pair of jigs 33A and 33B are vertically arranged in the second step portion. The bag body 10 after the first step is sandwiched in the gap between the pair of jigs 33A and 33B. The side surfaces of the pair of jigs 33A and 33B are inclined surfaces 33a and 33b that are inclined inward.
The inclined surfaces 33a and 33b form a cavity 34 having a triangular cross section.

In the first step, the front end surface 10a of the bag main body portion 10 which is expanded vertically and the front end portion of the folding portion 10B are positioned in the space 34, and the front end surface of the expanded bag main body portion 10 is located. A pair of slide plates 32, 32 are advanced and intruded into the inside of 10a in a direction orthogonal to the transport direction X from the side portions of the jigs 33A, 33B.

The sliding plates 32, 32 each have a tip end formed in a wedge shape and are pointed, and the wedge shape of the tip end portion is the space 3
The cross-sectional shape of No. 4 is almost the same. In addition, the sliding plate 32,
Rubber plates 32A, 32A made of silicon are fixed to the inner surfaces of 32, which face each other, with their outer edges protruding from the outer edges of the sliding plates 32, 32.

At the stage when the bag body 10 is transferred from the first process to the second process, the sliding plates 32, 32 in the retracted position are moved forward together with the base 37 as shown in FIG. 12 (a). Then, as shown in FIG. 12 (b), the bag body 10 is made to invade the inside of the tip surface 10 a. The forward movement of the base 37 and the backward movement described later are performed by the operation of the motor 35 and the screw shaft 36 as shown, and various means such as the use of a cam mechanism can be used.

After the sliding plates 32, 32 have entered the inside of the front end surface 10a of the bag body 10, as shown in FIG. 13 (c), one is in the same direction as the conveying direction X and the other is in the conveying direction X. And slide in the opposite direction and are driven so as to be separated from each other. As means for expanding the sliding plates 32, 32, various means such as a mechanism combining a motor and a screw shaft or a cam mechanism can be used.

When the sliding plates 32, 32 are opened, since the bag body 10 is moving in the carrying direction X, one sliding plate 32 that slides in the same direction as the carrying direction X is
It is slid at a speed faster than the moving speed of the bag body 10.

When the sliding plates 32, 32 slide, the outer edges of the rubber plates 32A, 32A are slidably in contact with the folds 10B of the bag body 10, respectively.
By pressing 0B against the inclined surfaces of the jigs 33A and 33B, as described above, the folding portion 10B is moved to the intermediate base point P.
Bending along the two ridgelines α extending obliquely from is formed a triangular open surface 10b.

FIGS. 14 and 15 are enlarged views showing a state in which the rubber plates 32A, 32A of the expanding plates 32, 32 slide on the surface of the folding portion 10B while sliding to form the opening surface 10b. FIG. Rubber plates 32A, 32A
When pressing the fold portion 10B against the inclined surfaces of the jigs 33A and 33B, the elasticity of the fold portion 10B makes contact with the fold portion 10B as if the fold surface was pressed by a human finger. Therefore, the folding line of the folding portion 10B is surely formed, and the open surface 10b having a good finish due to the beautiful folding line.
Is formed.

As shown in FIG. 13 (d), the sliding plates 32, 32 are retracted together with the base 37 when they are released from both sides of the bag body 10 after the formation of the opening surface 10b is completed. It returns to the initial state of (a).

In the third step (FIGS. 6 (c) and 7 (c)), the zipper tape 11 fed from the reel 38 is drawn between the front end faces 10a of the bag body 10 having the opening faces 10b. As shown in FIG. 9 (c), it is sandwiched.

In the fourth step (FIGS. 6 (d) and 7 (d)), the zipper tape 11 sandwiched between the tip surfaces 10a of the bag body 10 is pressed by the pressing machine 39 as shown in FIG.
As shown in (d), it is fused inside the tip surface 10a.
At this time, the zipper tape 11 is sandwiched between the front end faces 10a in a state where the male part and the female part are fitted to each other, and when the zipper tape 11 is fused by the pressing machine 39, the male part is The female part is fused inside the one tip surface 10a and inside the other tip surface 10a, respectively.

Fifth step (FIGS. 6 (e), (e '), FIG. 7)
(E), (e ')), the tip surface 1 of the bag body 10
The portion 10c on the tip side of the zipper tape 11 fused to the surface 0a is heat-sealed by the press machine 40 as shown in FIG.

Sixth step (FIGS. 6 (f), (f '), FIG. 7)
In (f) and (f '), the portion 11a of the zipper tape 11 fused to the tip surface 10a, which is located on the side of the bag body 10, is shown in FIG. As described above, the surface of the zipper tape 11 protruding laterally from the bag body 10 is cut while the surface of the zipper tape 11 is flattened. In this way, the portion 11a of the zipper tape 11 located on the side of the bag body 10 is flattened when the side of the bag body 10 is sealed in the next step (hereinafter, this sealing will be referred to as "sealing"). Is referred to as a side seal) so that the film material around the zipper tape 11 forming the bag body 10 is not cracked or a gap is not formed between the zipper tape 11 and the film material. This is because.

In the seventh step (FIGS. 6 (g) and 7 (g)), the pressing machine 42 performs side sealing of the bag body 10 as shown in FIG. 10 (g). This side seal is for sealing the entire upper side surface 10d of the opened bag body 10 when the bag body 10 shown in FIGS. 1 to 5 is produced. Due to this side seal, the opening formed in the side portion of the bag body 10 (see FIG. 1).
6 are shown as shaded areas)
Together with the sealing of the tip side portion 10c of the tip surface 10a in the fifth step, the entire outer edge portion of the tip surface 10a is sealed.

The gusset bag 10 'with a zipper produced through the above steps is filled with contents (for example, tea, coffee, etc.) from the unsealed rear end opening,
Seal the inside by sealing the rear end. When filling the contents, as shown in FIG. 17, a gusset bag 1 with a zipper is attached.
0'swells by expanding the folds 10B and increases its thickness to form a box shape. As a result, the internal capacity is remarkably larger than that of the conventional flat-type seal bag with a zipper, and the box-like shape enables self-standing.

When the zipper-equipped gusset bag 10 'is opened, the gap between the front seal portion 10c and the zipper tape 11 is cut along the chain line β in FIG. Then, if the seal by the zipper tape 11 is released, the upper portion of the gusset bag can be opened and the contents can be taken out. After the contents are taken out, the zipper tape 11 is sealed and the gusset bag 11 is again closed. The inside of 10 'can be sealed.

[0041]

As described above, according to the present invention, the fold side surface portion of the gusset bag is automatically processed, and the zipper is attached to the gusset bag and the sealing process is easily performed in the subsequent process. As a result, it is possible to automate the production of a gusset bag with a zipper, which has a large content capacity and is self-supporting, and mass production.
Moreover, the gusset bag with zipper produced has a good appearance and high commercial value.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing an apparatus for producing a bag body.

FIG. 2 is a perspective view showing a bag body.

3 is an enlarged perspective view showing a state in the middle of a production process of a bag main body portion by the apparatus of FIG.

FIG. 4 is a perspective view showing another example of a method for producing the bag body.

FIG. 5 is a perspective view showing another example of a method for producing the bag body portion.

FIG. 6 is a plan view showing a bag manufacturing apparatus in which the present invention is implemented.

FIG. 7 is a side plan view showing the bag manufacturing apparatus.

FIG. 8 is a perspective view showing, step by step, a state of bag making by the bag making apparatus.

FIG. 9 is a perspective view showing stepwise a continuation of the state of bag making by the bag making apparatus.

FIG. 10 is a perspective view showing stepwise a continuation of the state of bag making by the bag making apparatus.

FIG. 11 is a perspective view showing an embodiment of an open surface forming mechanism according to the present invention.

FIG. 12 is a plan view showing the operating state of the opening surface forming mechanism step by step.

FIG. 13 is a plan view showing stepwise a continuation of the operating state of the opening surface forming mechanism.

FIG. 14 is an enlarged plan view showing a stage in the middle of forming an opening surface by the opening surface forming mechanism.

FIG. 15 is a side view showing an operating state of the opening face forming mechanism.

FIG. 16 is a perspective view showing a portion of a bag body portion where side sealing is performed by the bag manufacturing device.

FIG. 17 is a perspective view showing an example of a gusset bag with a zipper manufactured by a bag manufacturing apparatus.

FIG. 18 is a perspective view showing a conventional seal bag with a zipper.

FIG. 19 is a perspective view showing a conventional gusset bag.

FIG. 20 is a perspective view showing a conventional method for producing a gusset bag with a zipper.

[Explanation of symbols]

 10 ... Bag main body 10 '... Gusset bag with zipper 10A ... Flat surface 10a ... Tip surface 10B ... Folded portion 10b ... Opening surface 32 ... Sliding plate 32A ... Rubber plates 33A, 33B ... Jig 34 ... Empty space 35 ... Motor 36 ... Screw / shaft 37 ... Kitadai P ... Base point α ... Ridge line

Claims (4)

[Claims] 1. A fold-shaped side surface portion in which a front surface and a rear surface are constituted by a pair of flat surface portions facing each other in parallel, and side surfaces respectively connect side edges of both flat surface portions and are folded inside the both flat surface portions. A bag making device for making a gusseted bag with a zipper by attaching a zipper to the bag body part where the side surface is not formed between the tip surfaces of both flat surfaces and the side surface is open. An open surface forming mechanism that forms an open surface for sealing the bag body by laterally folding the tip end of the fold-shaped side surface part, facing each other with a gap, on each side surface. The formed inclined surface forms a cavity having a wedge-shaped cross section, and the bag main body is sandwiched so that the front end surface having the open side surface and the front end of the fold-shaped side surface portion are located in the cavity. And a pair of jigs for positioning A pair of wedge-shaped sliding plates having substantially the same shape as the cross-sectional shape of the cavity formed by the tool, and the pair of jigs so as to intrude between the tip surfaces of the bag body portion sandwiched by the pair of jigs. While moving the pair of sliding plates forward, the pair of sliding plates are inserted between the front end surfaces of the bag main body, and then the pair of sliding plates are moved along a direction parallel to both flat surfaces of the bag main body. Driving means for sliding in opposite directions so as to separate from each other, and the driving means causes the pair of sliding plates to enter between the front end surfaces of the bag body portions and slide in opposite directions to separate from each other. At this time, the outer edge of the sliding plate presses the front end surface of the bag body and the fold-shaped side surface against the inclined surfaces of the pair of jigs and slides on the inner surface of the fold-shaped side surface. By doing so, the tip of the fold-shaped side part is folded. An open surface forming mechanism in a bag making process for a gusset bag with a zipper, which is formed by folding outward at one point on a reed line to form an open surface. 2. A rubber member attached to the outer edge portions of the pair of sliding plates, wherein the rubber member has a tip end surface and a fold-shaped side surface portion of the bag body portion, respectively, of the pair of jigs. The open surface forming mechanism in the bag making process of the gusset bag with a zipper according to claim 1, which presses against the inclined surface and slides on the inner surface of the fold-shaped side surface portion. 3. A fold-shaped side surface portion in which a front surface and a rear surface are constituted by a pair of flat surface portions facing each other in parallel, and side surfaces respectively connect side edges of both flat surface portions and are folded inside the both flat surface portions. When the zipper gusset bag is manufactured by attaching a zipper to the bag body part where the side surface is not formed between the tip surfaces of both flat parts and the side surface is open, The bag main body portion is sandwiched by a pair of jigs that are opposed to each other via a pair of jigs, and a cross section formed by the inclined surfaces of the side surfaces of the pair of jigs has a wedge-shaped cross section. The bag main body is positioned so that the tip of the fold-shaped side surface is positioned, and a pair of wedge-shaped sliding plates having a cross-sectional shape substantially the same as the cross-sectional shape of the cavity formed by the pair of jigs are provided. , The tip of the bag body that is sandwiched by a pair of jigs The pair of sliding plates are slid in the opposite directions so as to be separated from each other along the direction parallel to both flat surface portions of the bag main body by inserting the pair of sliding plates in the opposite directions. The front end surface of the bag main body and the fold-shaped side surface portion are pressed against the inclined surfaces of the pair of jigs and slid on the inner surface of the fold-folded side surface portion to form the front end portion of the fold-shaped side surface portion. A method for forming an opening surface in a bag making process for a gusset bag with a zipper, characterized in that the sheet is folded outward at a point on the fold line of the folding fold as a base point. 4. A rubber member is attached to the outer edge portions of the pair of sliding plates, and the rubber is arranged so as to press the tip end surface and the fold-shaped side surface portion of the bag body against the inclined surfaces of the pair of jigs. The opening surface forming method in the bag manufacturing process of the gusset bag with a zipper according to claim 3, wherein the members are slid along the inner surfaces of the fold-shaped side surfaces.