JP2005178856A - Packaging bag and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging bag which includes a folding sheet serving as an inner lid and a fastener for opening/closing and also can be facilitated and reduced in cost in manufacturing. <P>SOLUTION: The packaging bag A includes a bag body 1 formed of sheets 10a, 10b and 11, the fastener 2 located inside an open/close port 13 of the body 1, and the folding sheet 3 provided across inside the body 1. The fastener 2 and the folding sheet 3 are integrally formed or structured to join with each other. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a packaging bag having a structure in which a chuck is provided at an opening and closing portion and a folding sheet that functions as an inner lid or a partition is provided therein, and a method for manufacturing the same.

  An example of a packaging bag is shown in FIG. The illustrated packaging bag B has a bag body 90 in which a pair of substantially rectangular front and back sheets 90a are superposed and heat-sealed on their outer peripheral edges. The upper portion of the bag body 90 is an opening / closing port 92 that is opened by breaking and removing the heat seal portion 91. A chuck 93 is provided inside the opening / closing port 92, and a double-folded folding sheet 94 is provided at a position below the chuck 93 in the bag body 90. The folding sheet 94 is provided with a plurality of holes 94a.

  According to such a configuration, in a state where, for example, a granular or liquid container is accommodated in the bag main body 90, when the opening / closing port 92 is opened and then the opening / closing port 92 is directed downward, the container Passes through the plurality of holes 94a of the folded sheet 94 and is discharged to the outside. Therefore, most of the contents are not discharged to the outside of the bag body 90 at the same time, and a so-called dispensing function is obtained. When closing the opening / closing port portion 92 of the bag body 90, the opening / closing port portion 92 can be sealed by closing the chuck 93 so that moisture, dust, or the like does not enter the bag body 90.

  Conventionally, the packaging bag B described above has been manufactured by the following process. That is, as shown in FIG. 14, first, the chuck 93 and the folded sheet 94 are sandwiched between a pair of sheets 90a. And the contact part of them and a pair of sheet | seat 90a is heated and welded by two sets of heaters 95a and 95b. When the folded sheet 94 is welded, a welding prevention plate 96 is inserted into the folded portion of the folded sheet 94 in order to prevent a part of the folded sheet 94 from being welded. Thereafter, by using the heater 95c and other heaters, the upper and other peripheral portions of the pair of sheets 90a are welded to form a bag.

JP-A-10-81347

  However, the conventional packaging bag B has a configuration in which the chuck 93 and the folding sheet 94 are individually welded to the bag body 90. For this reason, when manufacturing the packaging bag B, it is necessary to individually arrange the chuck 93 and the folded sheet 94 between the pair of sheets 90a, and the operation becomes complicated. Further, since it is necessary to weld the chuck 93 and the folded sheet 94 individually to the pair of sheets 90a, the operation is also complicated. Therefore, the structure of the manufacturing apparatus for performing these operations is complicated, and the cost of the manufacturing apparatus becomes expensive, and the manufacturing cost of the packaging bag B itself is also expensive.

  Further, in the above prior art, when the chuck 93 and the folded sheet 94 are disposed between the pair of sheets 90a, it is necessary to consider so that neither of them will be displaced. Even if one of the chuck 93 and the folded sheet 94 is arranged at an accurate position, if the other is largely displaced, the packaging bag will no longer be a defective product. For these reasons, conventionally, the yield when the packaging bag B is manufactured is also poor.

  The present invention has been conceived under the circumstances described above, and facilitates manufacturing and reduces costs while including a folding sheet that serves as an inner lid and a chuck for opening and closing. It is an object of the present invention to provide a packaging bag that can be manufactured and a manufacturing method for manufacturing such a packaging bag.

  In order to solve the above problems, the present invention takes the following technical means.

  The packaging bag provided by the first aspect of the present invention traverses the inside of the bag body, a bag body formed of one or more sheets, a chuck located inside the opening / closing port of the bag body, and the bag body. And a folding bag provided in the bag body, wherein the chuck and the folding sheet are formed integrally with each other or joined together. It is a feature.

  The method for manufacturing a packaging bag provided by the second aspect of the present invention includes a step of attaching a chuck and a folding sheet to one or a plurality of sheets, and a step of forming a bag body from the sheet. Manufacturing for manufacturing a packaging bag provided in the bag body so that the zipper is positioned inside the opening / closing port of the bag body and the folding sheet crosses the bag body The method is characterized in that, as the chuck and the folding sheet, those formed integrally with each other or joined to each other are used.

  According to the present invention, unlike the prior art, there is no need to separately attach the chuck and the folding sheet to the bag body. For example, only the folding sheet or only the chuck is welded to the bag body. And can be attached to the bag body. Therefore, the work for attaching them to the bag body can be facilitated or simplified, and the manufacturing cost can be reduced. Moreover, the structure for manufacturing the packaging bag can be simplified and the cost can be reduced. Furthermore, according to the present invention, it is avoided that the chuck is attached to the bag body in a state where the relative positional relationship between the chuck and the folded sheet is shifted, and the generation rate of defective products is reduced accordingly. Therefore, the yield can be improved and the manufacturing cost of the packaging bag can be further reduced.

  Other features and advantages of the present invention will become more apparent from the following description of the embodiments of the invention.

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

  1 and 2 show an example of a packaging bag according to the present invention. The packaging bag A according to this embodiment includes a bag body 1, a chuck 2, and a folding sheet 3. However, as will be described later, the chuck 2 and the folding sheet 3 are integrally formed.

  The bag body 1 is formed in a sealed bag shape by using a pair of front and back sheets 10a, 10b and a bottom gusset piece 11. Each of the pair of sheets 10a and 10b and the bottom gusset piece 11 is flexible and has heat weldability. These are, for example, synthetic resin sheets such as heat-weld polyethylene (PE), polypropylene (PP), ethylene vinyl acetate copolymer (EVA), or laminates partially including such synthetic resin sheets. It is a sheet. In the case of a laminate sheet, it is sufficient that the surface on the inner surface side of the bag body 1 has a heat-welding property. For example, a metal foil or a non-heat-welding synthetic material is formed on the outer side of the synthetic resin sheet having the heat-welding property described above. A laminate of one or more resin sheets or the like can be used. The bag body 1 is provided with a plurality of heat seal portions 12a to 12c. The heat seal portions 12a and 12b are portions where the upper edge portions and the side edge portions of the pair of sheets 10a and 10b are overlapped and heat sealed. The heat seal portion 12c is a portion where the lower edge portions of the sheets 10a and 10b and the lower edge portions of the bottom gusset pieces 11 are overlapped and heat sealed.

  The upper part of the bag body 1 is an opening / closing part 13, and the upper part of the opening / closing part 13 is sealed by a heat sealing part 12 a. A notch 14 for opening is formed in a portion below the heat seal portion 12a in both side edge portions or the upper portion of one side edge portion of the bag body 1, and the notch 14 is formed from the position where the notches 14 are formed. By opening and closing the bag body 1 in the direction of the arrow N1, the opening / closing port 13 can be opened.

  The folding sheet 3 is made of a synthetic resin having flexibility, and as described above, the chuck 2 is integrally formed. The folding sheet 3 is formed with a plurality of through holes 30. For example, as shown in FIG. 3A, the folded sheet 3 has a convex portion 20 a and a concave groove forming portion 20 b as components of the chuck 2 integrally formed on both side edge portions 31 a of the sheet main body portion 31. By forming the formed sheet 3A with resin and then forming a plurality of through holes 30 between the convex portion 20a and the concave groove forming portion 20b of the sheet main body 31, as shown in FIG. It is manufactured. The sheet 3A can be manufactured by, for example, extrusion molding of a molten resin as a raw material. More specifically, it can be manufactured by simultaneously extruding portions corresponding to the chuck 2 and the sheet main body 31 from the nozzles of the molding machine. Examples of the material of the sheet 3A, that is, the material of the folded sheet 3, include PE, PP, EVA, and polyoxymethylene (POM). The material of the sheet 3A is not limited, but if it is the same as the material of the part to be welded of the bag body 1, their heat weldability will be good. Therefore, it is preferable to arrange the same materials. The convex portion 20a and the concave groove forming portion 20b of the chuck 2 both extend linearly, and the convex portion 20a can be fitted into and removed from the concave groove of the concave groove forming portion 20b. The thickness t of the sheet body 31 is preferably 20 to 150 μm, and more preferably 30 to 80 μm. If the thickness t is too small, the strength of the sheet main body 31 is weakened, and there is a possibility that cracks are likely to occur in the peripheral portion of the through hole 30 during bag making. On the other hand, if the thickness t is excessive, the cost is high and the sealing performance is inferior, and the heating temperature when the sheet main body 31 is heat-sealed is increased or the heating time is lengthened. This has the disadvantage of having to. If the thickness t is in the above-described range, it is suitable for eliminating such disadvantages.

  As shown in FIGS. 1 and 2, the folding sheet 3 is folded in two so that the folded portion becomes the lower end, and the chuck 2 is closed, and the folded sheet 3 is disposed on the upper portion in the bag body 1. It is joined to the bag body 1 via the heat seal portion 12d. The heat seal portion 12d is a portion where both side edge portions 31a of the folded sheet 3 are welded to the sheets 10a and 10b of the bag body 1, and does not unduly weld the convex portions 20a and the groove forming portions 20b of the chuck 2. Thus, it is located above these parts.

  Although not shown in the drawings, the packaging bag A has an accommodation in a region below the folding sheet 3 in the bag body 1. This accommodation is, for example, powdery, granular or liquid.

  Next, the manufacturing method of the packaging bag according to the present invention will be described by taking the case of manufacturing the packaging bag A as an example.

  First, by using a bag making apparatus C as shown in FIG. 4, two long belt-like sheets 10 a ′ and 10 b ′ are fed out from two take-up rolls R 1 and R 2, and these are formed between a pair of rollers 50. Are superposed and conveyed in a certain direction indicated by an arrow N2. In parallel with this, a long belt-like folded sheet 3 ′ and a gusset sheet 11 ′ are fed out from the take-up rolls R3 and R4 and fed between the sheets 10a ′ and 10b ′. The folded sheet 3 ′ is formed into a folded sheet 3 by a cutting process to be described later. As shown in FIG. 5, the folded sheet 3 ′ is folded between the side edges of the sheets 10a ′ and 10b ′ with the chuck 2 closed. Deploy. The gusset sheet 11 ′ is made into a bottom gusset piece 11 by a cutting process described later, and is arranged between the other side edges of the sheets 10a ′ and 10b ′ in a folded state.

  The folded sheet 3 ′ is not fed out from the take-up roll R3, but is set at a predetermined position in a non-wind-up roll state, for example, and is fed out between the sheets 10a ′ and 10b ′ from this portion. It doesn't matter. If the folded sheet 3 ′ is strongly wound, the chuck 2 may be damaged by the winding pressure. However, according to the feeding means as described above, such a fear can be eliminated. Further, the folded sheet 3 ′ is not fed in a folded state, for example, but in a non-folded state in which the chuck 2 is opened, and a former is used in a conveying path until the chuck 2 is fed into the sheets 10a ′ and 10b ′. Alternatively, the chuck 2 may be folded in half.

  In the process of transporting the sheets 10a ′ and 10b ′ in a superimposed manner, the folding sheet 3 ′ is welded. As shown in FIG. 6, this welding operation is performed by a pair of sealers 52A in a state in which the welding prevention plate 51 is inserted between the respective side edges of the sheets 10a ′ and 10b ′. This is performed by heating the portions corresponding to both side edges of the folding sheet 3 ′ in 10b ′. Thereby, the above-described heat seal portion 12d is provided. Due to the presence of the plate 51, the sheets 10a 'and 10b' and a part of the folded sheet 3 'can be prevented from being improperly sealed. Further, since the sealer 52A heats the position away from the chuck 2, it is also possible to prevent the convex portion 20a and the concave groove forming portion 20b of the chuck 2 from being improperly sealed. As shown in FIG. 4, a cooler 53A is provided at the subsequent stage of the sealer 52A, and the heat seal part 12d is cooled by the cooler 53A. If it does in this way, the melt softening state of heat seal part 12d will be canceled at an early stage, and it can prevent improper welding of parts other than a seal object part while making operation speed of bag making apparatus C high. .

  Thereafter, as shown in FIG. 7, the heat seal portion 12a is provided by sandwiching and heating one side edge portions of the sheets 10a ′ and 10b ′ with a pair of sealers 52B. Further, the heat seal portion 12c is provided by sandwiching and heating the other side edge portions of the sheets 10a ′ and 10b ′ and the both side edge portions of the gusset sheet 11 ′ with a pair of sealers 52C. If one side of the gusset sheet 11 ′ that comes into contact with the sheets 10a ′ and 10b ′ is heat-weldable and the other surface is not heat-weldable, the gusset sheet 11 ′ is used. The two side edges can be properly sealed with respect to the sheets 10a 'and 10b' without improperly sealing the two side edges. As shown in FIG. 4, coolers 53B and 53C are provided in the subsequent stages of the sealers 52B and 52C, respectively, and the heat seal portions 12a and 12c are cooled at an early stage. Is prevented.

  In the subsequent stage of the coolers 53B and 53C, a plurality of heat seal portions 12b are sequentially provided by sandwiching and heating the sheets 10a ′ and 10b ′ with one or more pairs of sealers 52D. At the subsequent stage, by using the cutting tool 54, the sheets 10a ′ and 10b ′ are cut in the width direction (short direction) to sequentially produce a plurality of packaging bags A ′. Although not shown in FIG. 4, the opening notch 14 is formed at the same time as the cutting. Each packaging bag A ′ is provided with a heat seal portion 12b at one side edge portion thereof, whereas the opening portion 19 is formed at the other side edge portion. In each packaging bag A ′, the contents are not yet stored.

  After producing the packaging bag A ′, as shown in FIG. 8, the opening 19 at one side edge of the packaging bag A ′ is opened, and the contents are contained in the packaging bag A ′ from the opening 19. To accommodate. After finishing the housing operation, the opening 19 is closed and the edge is heated and welded. Thereby, the packaging bag A shown in FIG. 1 and FIG. 2 is obtained.

  Next, the operation of this embodiment will be described.

  First, in order to take out the contents from the inside of the packaging bag A, the upper portion of the packaging bag A is broken from the opening notch 14 to remove the formation region of the heat seal portion 12a. As a result, the packaging bag A is in the form as shown in FIG. 9A, and the portion above the chuck 2 is opened. Next, when the chuck 2 is opened, the opening / closing port portion 13 can be largely opened as shown in FIG. At that time, since the folded sheet 3 crosses the bag body 1 in the stretched state, even if the opening / closing opening 13 of the packaging bag A is directed downward, the contents are discharged to the outside of the packaging bag A all at once. That is blocked. The stored material passes through the through hole 30 of the folded sheet 3 and is gradually discharged to the outside, so that a so-called dispensing function is obtained. After the desired amount is discharged, the opening / closing port 13 can be sealed by closing the chuck 2.

  In the present embodiment, the chuck 2 is formed integrally with the folding sheet 3, and as a means for welding them to the bag body 1, a pair of heat seal portions 12 d are provided on both side edges of the folding sheet 3. However, a dedicated heat seal part for welding the chuck 2 is not provided. Therefore, compared with the prior art, the number of work steps for welding the chuck 2 and the folding sheet 3 to the bag body 1 is small, and the manufacturing work is facilitated accordingly. Further, when manufacturing the packaging bag A, it is not necessary to separately feed the chuck 2 and the folding sheet 3 between the two sheets 10a ′ and 10b ′, and the feeding operation is facilitated, and the structure of the manufacturing apparatus is simplified. Can also be achieved. Further, there is no possibility of relative displacement between the chuck 2 and the folded sheet 3. Therefore, in this embodiment, defective products are not generated due to the positional deviation, and the yield is improved.

  The present invention is not limited to the contents of the above embodiment. The specific configuration of each part of the packaging bag according to the present invention can be varied in design in various ways. Similarly, the specific configuration of each step of the method for manufacturing a packaging bag according to the present invention can be variously changed.

  If the chuck and the folding sheet are integrally molded with resin, these manufacturing costs will be reduced, and the strength of the part where the chuck and the folding sheet are connected to each other will be high, resulting in excellent durability. The advantage that it can be obtained. However, the present invention is not limited to this. In the present invention, for example, as shown in FIG. 10 (a), the convex member 20a 'and the concave groove forming member 20b' of the chuck 2 and the folded sheet 3 are formed separately, and these are joined together. You can also use things. As a means for joining the convex member 20a ′ and the concave groove forming member 20b ′ to the folding sheet 3, a sealing means such as a heat seal may be used. Further, for example, the convex member 20a ′ and the concave member may be used instead. It is also possible to employ a means for extruding the groove forming member 20b 'and arranging and fusing them on the folded sheet 3 while they are still in a soft state at a relatively high temperature. According to such means, the sealing work is unnecessary and the manufacturing efficiency is good, so that the manufacturing cost can be reduced.

  In the present invention, as shown in FIG. 10 (b), the convex member 20 a ′ and the concave groove forming member 20 b ′ of the chuck 2 may be sealed so that a part of the convex member 20 a ′ and the concave groove forming member 20 b ′ protrude from the folded sheet 3. . In this case, instead of sealing the folding sheet 3 to the bag body, the protruding portions of the convex member 20a ′ and the groove forming member 20b ′ are sealed to the bag body, whereby the chuck 2 and the folding sheet 3 are It can be set as the structure attached to the main body.

  In the present invention, as shown in FIG. 11 (a), the folded sheet 3 has, for example, a two-layer structure, and the outer layer portion 39a welded to the pair of sheets 10a and 10b is a low melting point resin excellent in heat weldability. In addition, the inner layer portion 39b and the convex portion 20a and the groove forming portion 20b of the chuck 2 may be made of a resin having a higher melting point than the outer layer portion 39a and inferior in heat-weldability. Between the outer layer portion 39a and the inner layer portion 39b, an intermediate layer (for example, a layer exhibiting a heat insulating function) made of a different material may be added.

  According to such a configuration, as shown in FIG. 4B, when the folded sheet 3 is folded in two and thermally welded to the pair of sheets 10a and 10b, the inner layer portions 39b are connected to each other, and the convex portion 20a. It is possible to appropriately weld the outer layer portion 39a to the sheets 10a and 10b while avoiding the welding of the groove forming portions 20b. When the folded sheet 3 is welded, for example, it is not necessary to use the thermal welding prevention plate 51 shown in FIG. 6 or a plate corresponding thereto. By the way, in the configuration as described above, for example, when the inner layer portion 39b is PE, the outer layer portion 39a is EVA, and when the inner layer portion 39b is PP or POM, the outer layer portion 39a is PE or EVA. This can be realized.

  Further, as described above, the configuration in which the melting point is different between the outer surface side and the inner surface side of the folding sheet 3 is formed by separately forming the folding sheet 3 and the chuck 2 as shown in FIGS. 10 (a) and 10 (b). It can be applied even if That is, the folding sheet 3 shown in the figure is made of a low melting point resin having good heat-weldability, and the convex member 20a ′ and the concave groove forming member 20b ′ constituting the chuck 2 have a melting point higher than that of the folding sheet 3. If made of a high resin, it is possible to appropriately weld the folded sheet 3 to the bag body while preventing at least the convex member 20a ′ and the concave groove forming member 20b ′ from being unduly welded.

  Furthermore, in the present invention, as shown in FIG. 12, the folding sheet 3 and the chuck 2 may be configured to include a coating layer 38. The coating layer 38 is formed, for example, by applying a fluororesin or silicon. The one side of the folding sheet 3 on the side where the chuck 2 is provided, and the convex portion 20a constituting the chuck 2 and The surface of the concave groove forming portion 20b is covered. Even with such a configuration, the same operation as described with reference to FIG. 11 can be obtained.

  The chuck according to the present invention may be any chuck as long as at least a pair of components are detachable from each other. In general, the chuck is used for obtaining an airtight sealing property, but a chuck having no such sealing property can be used. Further, as a means for improving the hermetic sealability, for example, as shown in FIG. 10 (c), a so-called two-row type chuck provided with two pairs of convex portions 20a and concave groove forming portions 20b, or a configuration more than that A chuck with a large number of elements may be used.

  The folding sheet referred to in the present invention is suitable for providing a role as an inner lid for dispensing the contents by providing one or a plurality of through holes, but is not limited to this. For example, without providing a through hole in the folded sheet, the folded sheet functions as a mere partition sheet, or a sealing sheet for ensuring an airtight state in the bag body until the bag body is opened. It may be useful as. Instead of means for opening an appropriate number of holes in the folded sheet, a configuration using a mesh-like sheet may be employed.

  The bag body does not ask whether or not the whole is hermetically sealed. In short, the bag body only needs to have a bag-like form, and a part thereof may be opened. Therefore, in this invention, it can be set as the structure which does not have the heat seal part (part corresponded to the heat seal part 12a of the said embodiment) for sealing the opening-and-closing opening part of a bag main body. Furthermore, unlike the packaging bag A described in the above embodiment, a configuration in which no item is accommodated therein may be employed. In other words, the packaging bag according to the present invention is formed with the opening for accommodating the contents as in the packaging bag A ′ shown in FIGS. You may be in the state which is not accommodated. Such packaging bags are also included in the technical scope of the present invention.

It is a partially broken perspective view which shows an example of the packaging bag which concerns on this invention. It is II-II sectional drawing of FIG. (A), (b) is sectional drawing which shows the manufacture example of the folding sheet | seat integrated with a chuck | zipper used for the packaging bag shown in FIG. It is a schematic perspective view which shows a part of process of manufacturing the packaging bag shown in FIG. It is VV sectional drawing of FIG. It is VI-VI sectional drawing of FIG. It is VII-VII sectional drawing of FIG. It is a perspective view which shows the process of manufacturing the packaging bag shown in FIG. 1 from the packaging bag manufactured by the process shown in FIG. (A), (b) is principal part sectional drawing which shows the use condition of the packaging bag shown in FIG. (A)-(c) is sectional drawing which shows the other example of a chuck | zipper and a folding sheet. (A), (b) is sectional drawing which shows the other example of a chuck | zipper and a folding sheet. It is sectional drawing which shows the other example of a chuck | zipper and a folding sheet. It is a partially broken perspective view which shows an example of the conventional packaging bag. It is sectional drawing which shows an example of the manufacturing method of the conventional packaging bag.

Explanation of symbols

A Packaging bag 1 Bag body 2 Chuck 3, 3 'Folded sheet 10a, 10b Sheet 10a', 10b 'Sheet 11 Bottom gusset piece 11' Gusset sheet 12a-12d Heat seal part 13 Opening / closing opening part 20a Convex part 20b Concave Groove forming part

Claims (2)

A bag body formed of one or more sheets;
A chuck located inside the opening / closing port of the bag body,
A folding sheet provided in the bag body so as to cross the bag body;
A packaging bag comprising:
The packaging bag, wherein the chuck and the folding sheet are integrally formed with each other or joined to each other. Attaching a chuck and a folding sheet to one or more sheets, and forming a bag body from the sheet,
A manufacturing method for manufacturing a packaging bag provided in the bag body such that the chuck is positioned inside the opening / closing opening of the bag body and the folding sheet crosses the bag body. There,
A method for manufacturing a packaging bag, wherein the chuck and the folding sheet are formed integrally with each other or joined to each other.

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