JP6902836B2 - Packaging bag with spout and its manufacturing method - Google Patents

Description

The present invention relates to a packaging bag with a spout and a method for manufacturing the same.

In recent years, as a packaging bag for storing foods and refill contents such as detergents, a packaging bag using a laminate (film) containing a base material and a sealant layer has been used. The packaging bag is provided with a spout for facilitating the pouring of the contents, and a straw, a pipe, or the like is used as a flow path forming member for forming the flow path of the spout (for example, a patent). Document 1).

This type of pouch is provided with an opening auxiliary line for improving the opening property of the spout (for example, Patent Document 2). Laser machining can be mentioned as a method of forming a half-cut line as an auxiliary opening line.

Japanese Unexamined Patent Publication No. 09-024956 Japanese Patent No. 408538

In a packaging bag having a flow path forming member, for example, if a laminate is adhered to the outer peripheral surface of the flow path forming member, it will be behind the flow path forming member when the opening auxiliary line is formed by laser processing. There will be areas where the laser beam does not reach. If the laser beam for processing is blocked by the flow path forming member, there is a problem that processing defects occur and the pull tab cannot be separated from the main body at the time of opening.

The present invention has been made in view of the above-mentioned problems of the prior art, and is a packaging bag having good openability of the spout, and a predetermined processing position without the laser beam for processing being blocked by the flow path forming member. One of the purposes is to provide a method for manufacturing a packaging bag with a spout that can reach the above point and perform good laser processing.

The packaging bag with a spout according to one aspect of the present invention is a packaging bag with a spout having a flow path forming member at the spout, and is provided around a pair of films to be overlapped with each other and the pair of films. The first unsealed portion formed between the first sealed portion and the pair of films surrounded by the first sealed portion, and the first unsealed portion are provided so that the rear end is exposed. A cylindrical flow path forming member that serves as a flow path for the spout, a second unsealed portion that communicates with the first unsealed portion via the flow path forming member, and a length direction of the flow path forming member. Irradiating the pair of films with laser light so as to cross the second sealing portion for the pair of films provided in a part in the circumferential direction, the flow path forming member, and the second unsealed portion. The opening auxiliary line formed in the above is provided, and the tip of the flow path forming member is exposed from the pair of films after opening, and the opening auxiliary line is formed in the second unsealed portion. in position, the sealing end of the first seal portion in the radial direction on both sides of the flow path forming member, seen including a gap formed between the tip of the flow path forming member, said flow path forming member, The tip is exposed in the second unsealed portion and is arranged on the circumference of the second unsealed portion which has a substantially circular shape in a plan view so as to be substantially orthogonal to the circumference. , when viewed from the length direction of the flow path forming member, the seal end in the opening assisting line is formed position, the flow path than the tangent of the flow path forming member connecting the said clearance a laser light source It is located on the radial outer side of the forming member.

In the packaging bag with a spout according to one aspect of the present invention, when viewed from the length direction of the flow path forming member, the seal end at the position where the opening auxiliary line is formed is on the tangent line of the flow path forming member. It may be located at, or may be located radially outside the flow path forming member from the tangent line of the flow path forming member.

In the packaging bag with a spout according to one aspect of the present invention, the distance between the seal end and the flow path forming member at the position where the opening auxiliary line is formed is 15% or more of the diameter of the flow path forming member. The length may be 60% or less.

In the packaging bag with a spout according to one aspect of the present invention, the length of the tip of the flow path forming member exposed from the pair of films after opening is 20% or more of the total length of the flow path forming member. The configuration may be 50% or less.

In the packaging bag with a spout according to one aspect of the present invention, the gap may be widened toward the tip end side in the length direction when viewed from the normal direction of the film.

The method for manufacturing a packaging bag with a spout in one embodiment of the present invention is a method for manufacturing a packaging bag with a spout having a flow path forming member at the spout, and flows between a pair of films arranged in layers. By arranging the path forming members and heat-sealing these sealing portions while pressing them from both sides in the thickness direction of the pair of films, a first sealing portion is formed around the pair of films and the flow path is formed. A step of forming a second sealed portion in a part of the length direction of the forming member in the circumferential direction to obtain an unsealed portion around the flow path forming member, and the sealed pair of films. A step of forming an opening auxiliary line by performing laser processing so as to cross the flow path forming member and the unsealed portion is provided, and in the step of obtaining the unsealed portion, the opening auxiliary line is formed. in position, the sealing end of the first seal portion in the radial direction on both sides of the flow path forming member, said forming a non-sealed portion so as to form a gap between the flow path forming member, the laser processing In the step of applying, laser light is irradiated so as to cross the unsealed portion and the sealed end on both sides in the radial direction of the flow path forming member along the radial direction of the flow path forming member. When viewed from the length direction, the seal end at the position where the opening auxiliary line is formed is radially outside the flow path forming member from the tangent line of the flow path forming member connecting the laser light source and the gap. It is located .

Further, the packaging bag with a spout according to one aspect of the present invention has the unsealed portions on both sides of the fluid forming member in the radial direction and the unsealed portions on both sides in the radial direction of the flow path forming member in the step of performing the laser processing. A laser beam is applied so as to cross the end of the seal.

According to the present invention, a packaging bag having a good spout opening property, a laser beam for processing can reach a predetermined processing position without being blocked by a flow path forming member, and good laser processing can be performed. A method for manufacturing a packaging bag with an outlet can be provided.

The figure which shows the structure of the packaging bag with a spout in an embodiment. The figure which shows the structure near the pouring outlet of a packaging bag enlarged. Cross-sectional view near the spout along the opening auxiliary line. The flowchart for demonstrating the manufacturing method of the packaging bag with a spout in an embodiment. The figure which shows the structure of the bag making machine for continuously manufacturing a packaging bag with a spout. The figure for demonstrating the flow path forming member supply process. The figure for demonstrating the opening auxiliary line forming process. The figure which performs laser processing with no gap between a body film and a flow path forming member. The figure which shows the state at the time of opening when there is an unformed part of the opening auxiliary line. The figure which performs laser processing with a gap between a body film and a flow path forming member.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each drawing used in the following description, the scale of each member is appropriately changed in order to make each member recognizable.

[Packaging bag]
FIG. 1 is a plan view showing the configuration of the packaging bag 5 with a spout according to the present embodiment. FIG. 2 is an enlarged view showing the configuration of the packaging bag 5 in the vicinity of the spout.
As shown in FIG. 1, the packaging bag 5 of the present embodiment has two body film (films) 2 and 2 having the same planar shape and a bottom portion folded in half around a folding line 3a. It is a standing pouch composed of a film 3.

As shown in FIG. 1, the bottom film 3 is folded so that the folding line 3a faces inward and is interposed between the lower portions of the pair of body films 2 and 2. The pair of body films 2 and 2 and the bottom film 3 are overlapped with each other, and the peripheral edges of the body films 2 and 2 are heat-sealed to be integrally formed except for the filling port 13. Specifically, in the packaging bag 5, the side end sealing portions 5b and 5b formed by sealing the left and right side ends, and the lower side and the bottom film 3 of the body film 2 and 2 face each other. It has a bottom sealing portion 5a formed by sealing the lower end edges of the facing surfaces with each other. In FIG. 1, hatching is added to clearly indicate the range of the seal portion.

The filling port 13 located on the upper end side of the body films 2 and 2 is open for filling the contents, and the contents can be filled in the accommodating portion 1a of the packaging bag 5 through the filling port 13. It is possible. After the contents are filled in the accommodating portion 1a formed in the first unsealed portion 15A, the filling port 13 is closed by sealing in the same manner as the other portions. The first unsealed portion 15A is a portion in which the body film 2 and 2 are separably overlapped with each other without being sealed (bonded or joined). After the contents are filled in the accommodating portion 1a, the bottom film 3 is pushed downward by the weight of the contents, so that the bottom area is increased and the packaging bag 5 can stand.

As shown in FIG. 1, between the upper corner portion of the packaging bag 5, that is, the upper side 14a and the side side 14b, a second unsealed portion (unsealed portion) 15B serving as a flow path for the spout 14 is provided in the packaging bag. It is provided so as to face diagonally upward of 5.

The gap forming seal portions (first seal portions) 15a and 15b partition both side portions of the flow path when the tip portion of the spout 14 is removed to open the flow path, and one gap forming seal portion is formed. The flow path forming member 4 arranged in the second unsealed portion 15B between the 15a and the other gap forming seal portion 15b serves as the flow path of the spout 14. Examples of the flow path forming member 4 include a cylindrical straw and the like. The tip of the second unsealed portion 15B is closed by the sealing sealed portion (first sealed portion) 15c.

Such a flow path forming member 4 is arranged so that its length direction is along the flow path direction A shown in FIG. 1, and is partially formed on at least one body film 2 by the point seal 19 shown in FIG. It is heat-welded and fixed.

The flow path forming member 4 of the present embodiment is further fixed to the body film 2 and 2 by the second seal portion 25. The second seal portion 25 is formed along the circumferential direction at least in a part of the flow path forming member 4 in the length direction. Since the second sealing portion 25 is formed by the pair of body film 2 and 2 coming into close contact with the outer peripheral surface of the flow path forming member 4 without a gap, the first unsealed portion 15A and the second unsealed portion 15B Is in a state of communicating through the flow path forming member 4. The area of the flow path forming member 4 other than the area where the second seal portion 25 is formed is not adhered to the body film 2 and 2. The tip 4a of the flow path forming member 4 is exposed in the second unsealed portion 15B and is not adhered to the body film 2 and 2.

The spout 14 is provided with an opening auxiliary line 9 formed so as to cross the flow path forming member 4 serving as a flow path and the second unsealed portion 15B in order to facilitate opening. The opening auxiliary line 9 is formed inside the flow path forming member 4 in the length direction so that the tip 4a of the flow path forming member 4 is exposed from the body films 2 and 2 at the time of opening.

Further, the spout 14 is further provided with a tab 16a formed by a cutout line 17a on one end side of the opening auxiliary line 9 and a tab 16b formed by a cutout line 17b on the other end side of the opening auxiliary line 9. Has been done. When tab 16a and tab 16b are not distinguished in the following description, they may be simply referred to as tab 16.

The opening auxiliary line 9 is formed with a length that crosses the gap forming seal portions 15a and 15b that partition the second unsealed portion 15B and the cutout lines 17a and 17b in one direction, respectively. By connecting 9 to one cutout wire 17a and the other cutout wire 17b, the tab 16 can be separated at the time of opening. The opening auxiliary line 9 is provided on each of the two body films 2 and 2 including the spout 14.

Such an opening auxiliary line 9 is composed of a half-cut line. The half-cut line has a structure in which a part of the body film 2 in the thickness direction is continuously cut in the longitudinal direction. Since the body film 2 is connected at least in a part in the thickness direction, the contents do not leak through the half-cut line before opening. The range in which the opening auxiliary line 9 is formed in the thickness direction of the body film 2 is not particularly limited, but it is preferable that the cut portion is not exposed inside or outside (one or both) of the body film 2. Laser processing can be mentioned as a method of forming a half-cut line inside the body film 2. Examples of a method for forming a half-cut line on the surface of the body film 2 include laser machining and a cutting tool.

The dimensions of the packaging bag 5 are not particularly limited, but the suitable range for the refill container is that the height (length in the Y direction) of the packaging bag 5 is about 100 to 500 mm and the width of the packaging bag 5 (both sides). The maximum width between the ends: the length in the X direction) is about 70 to 300 mm, and the filling amount of the contents is about 100 to 5000 cm ³ . The content is not particularly limited, and examples thereof include a liquid substance, a solid such as a powder or a granule, a viscous substance, a liquid, or a mixture thereof.

As the film used as the body film 2 and the bottom film 3, a film made of, for example, biaxially stretched polypropylene, biaxially stretched polyamide, biaxially stretched polyester, or the like as a base film 29 is used as a base film 29. A laminate 20 in which a polyolefin-based resin such as low-density polyethylene, linear low-density polyethylene, ethylene-vinyl acetate copolymer, or polypropylene is laminated as a sealant film is used on the base film 29 of the above.

Examples of the method for producing the laminated body 20 include a dry laminating method, an extrusion laminating method, and a coextrusion method. An adhesive, an anchoring agent, or the like can be provided between the base film 29 and the sealant film 18 in order to improve the adhesive strength. In this case, a plurality of base films may be laminated in order to increase the strength of the packaging bag 5. Alternatively, in order to enhance the barrier property of gas and ultraviolet rays, a metal foil such as an aluminum foil, a metal vapor deposition layer, an inorganic vapor deposition layer such as ceramic, an ethylene-vinyl alcohol copolymer film, or the like may be laminated.

(Structure near the spout)
Next, the structure near the spout of the packaging bag 5 will be described in detail. In the following description, FIGS. 1 and 2 will be referred to as appropriate.
FIG. 3 is a cross-sectional view of the vicinity of the spout in the opening auxiliary line.
As shown in FIGS. 1 and 2, in the present embodiment, the second seal portion 25 is provided closer to the end portion 4b on the first unsealed portion 15A side than the central portion in the length direction of the flow path forming member 4. The tip 4a side of the flow path forming member 4 in the length direction is exposed in the second unsealed portion 15B.

At the location where the second seal portion 25 is formed, the body film 2 and 2 are in close contact with each other in the circumferential direction of the flow path forming member 4, and the outer peripheral surface of the flow path forming member 4 and the body film 2 and 2 are in close contact with each other. There is no gap between them.

The second unsealed portion 15B has a substantially circular shape in a plan view extending from the second sealed portion 25 toward the tip 4a side of the flow path forming member 4, and as an example, in the present embodiment, the maximum width flows. The size is set to about twice the diameter of the road forming member 4.

As shown in FIGS. 2 and 3, the second unsealed portion 15B is located on both sides of the flow path forming member 4 in the radial direction at a position along the opening auxiliary line 9 and flows with the seal end 15d of the gap forming sealing portion 15a. The gaps 7 and 7 are provided between the outer peripheral surface of the path forming member 4 and between the seal end 15e of the gap forming seal portion 15b and the outer peripheral surface of the flow path forming member 4, respectively. Here, the seal ends 15d and 15e are the ends of the region where the pair of body films 2 and 2 are sealed.

In the present embodiment, when viewed from the length direction of the flow path forming member 4 as shown in FIG. 3, the seal ends 15d and 15e at the position where the opening auxiliary line 9 is formed are the tangents f of the flow path forming member 4. , F are located outside the flow path forming member 4 in the radial direction.

Of the second unsealed portion 15B, the lengths of the gaps 7 and 7 along the opening auxiliary line 9, that is, the flow path forming member 4 and the seal ends 15d and 15e at the position where the opening auxiliary line 9 is formed, respectively. The lengths L and L between them are 15% or more and 60% or less of the diameter of the flow path forming member 4, respectively. More preferably, the length is 20% or more and 50% or less. In the present embodiment, the lengths L and L of the gaps 7 and 7 have substantially the same dimensions as each other, but they may be different.

As shown in FIG. 2, the position of the opening auxiliary line 9 of the present embodiment is set so that the flow path forming member 4 is exposed from the pair of body films 2 and 2 by a predetermined length after opening. ing. Specifically, the position of the opening auxiliary line 9 is set so as to be located within a range of 20% or more and 50% or less from the tip 4a of the flow path forming member 4 in the length direction of the flow path forming member 4. As a result, of the total length of the flow path forming member 4, the length of 20% or more and 50% or less from the tip 4a is exposed from the body films 2 and 2 after opening.

In the present embodiment, the flow path forming member 4 is arranged on the circumference of the second unsealed portion 15B having a substantially circular shape in a plan view so as to be substantially orthogonal to the circumference. As a result, gaps 7 and 7 are inevitably present on both sides of the flow path forming member 4 in the radial direction between the seal ends 15d and 15e, respectively.
The shape of the second unsealed portion 15B in a plan view is not particularly limited as long as the gaps 7 and 7 can be provided between the seal ends 15d and 15e on both sides of the flow path forming member 4 in the radial direction. The shape is not limited to a circular shape, and other shapes may be used. For example, it may be oval, trapezoidal, or rectangular.

[Manufacturing method of packaging bag with spout]
Next, a method for manufacturing a packaging bag with a spout according to the present invention will be described.
FIG. 4 is a flowchart for explaining a method of manufacturing the packaging bag 5 with a spout according to the present embodiment. FIG. 5 is a diagram showing a configuration of a bag making machine 10 for continuously manufacturing a packaging bag 5 with a spout. FIG. 6 is a diagram for explaining the flow path forming member supply step S3. FIG. 7 is a diagram for explaining the opening auxiliary line forming step S5.

As shown in FIG. 4, the manufacturing method of the packaging bag 5 with a spout of the present embodiment includes a recess forming step S1, a laminated body compounding step S2, a flow path forming member supply step S3, a sealing step S4, and opening auxiliary line forming. Step S5 and separation step S6 are mainly carried out. In this embodiment, the sealing step S4 and the opening auxiliary line forming step S5 will be described in detail.

(1) Recess forming step S1
First, recesses 24, 24 for arranging the flow path forming members 4, 4 are formed in the laminated body 20 unwound from the feeding roll 21. Specifically, the preheating portion 49a in the recess forming means 49 preheats the arrangement region of the flow path forming member 4 at predetermined intervals along the transport direction of the laminated body 20, and the recess forming portion 49b forms the laminated body 20. A pair of recesses 24 are formed. Since the bag making machine 10 of the present embodiment has two chamfers, two recesses 24 are formed in the width direction. When the recess forming means 49 is not provided, the recess forming step S1 can be omitted.

(2) Laminated compound leaf forming step S2
In the laminated body biplane step S2, the laminated body 20 unwound from a feeding roller (not shown) is cut at the center in the width direction by the cutter 42a of the laminated body biplane means 42 in the bag making machine 10 shown in FIG. The body films 2 and 2 of the above. After that, the body films 2 and 2 are conveyed with the sealant layers 18A facing each other and separated from each other in the vertical direction.

(3) Flow path forming member supply step S3
Next, the flow path forming member 4 is supplied to a predetermined position on the sealant layer 18A of the one body film 2 conveyed below (FIG. 6). Specifically, the flow path forming member supplied from the flow path forming member standby portion 54 in the flow path forming member supply means 44 to the flow path forming member conveying means 52 one by one via the flow path forming member supply valve 58. 4 is sucked and held by the installation portion 53, and moved onto the body film 2 to be arranged. After that, a part of the flow path forming member 4 is heat-welded to the body film 2 by the point seal portion 55 and temporarily fixed.

(4) Sealing process S4
Next, as shown in FIG. 7, the other body film 2 is superposed on one body film 2 on which the flow path forming member 4 is arranged, and each body film 2 is superposed by the bottom base material inserting means 22. , 2 The bottom film 3 is inserted between the both side ends in the width direction and conveyed, and the desired regions of the body films 2 and 2 and the bottom film 3 are sequentially sealed.

First, the flow path forming member sealing means 56 seals the portion of the pair of body film 2 and 2 overlapped with the flow path forming member 4 interposed therebetween to form the second sealing portion 25. Specifically, the portion where the flow path forming member 4 is interposed is heated by a heater (not shown) and then cooled by a cooling portion (not shown) so that the periphery of the flow path forming member 4 and the body films 2 and 2 are formed. Is sealed and the flow path forming member 4 is fixed to the body films 2 and 2.

Here, by sealing the area around the flow path forming member including the upper side 14a and the side side 14b of the spout 14 shown in FIG. 1, the gap forming seal portion 15a and the gap forming seal portion 15b are formed, and the flow path is formed. A second unsealed portion 15B having gaps 7 and 7 shown in FIG. 1 is obtained on both sides of the forming member 4 in the radial direction.

After that, the vertical sealing means 45 vertically seals the laminated portions of the body films 2 and 2 and the bottom film 3 along the conveying direction. Specifically, the area to be vertically sealed along the transport direction is heated by a heater (not shown) and then cooled by a cooling portion (not shown), so that the bottom seal portion 5a of the packaging bag 5 of the body films 2 and 2 is cooled. Heat seal the area to be.

Subsequently, the horizontal sealing means 46 performs horizontal sealing along the width direction of the body films 2 and 2. Specifically, both sides of the body films 2 and 2 are heated by a heater (not shown) and then cooled by a cooling unit (not shown) to perform horizontal sealing along the width direction of the body films 2 and 2. The regions to be the side end seal portions 5b and 5b of the above are heat-sealed. In this way, the first unsealed portion 15A, which is the accommodating portion 1a shown in FIG. 1, is obtained.

At the time of each sealing operation, the buffer means 41 and 41 are used for the body films 2 and 2 and the bottom film 3 which are continuously fed from the laminated body biplane forming means 42 and the bottom base material inserting means 22 and are superposed on each other. A variable amount of buffer is formed, and the buffer is intermittently conveyed at predetermined intervals by the intermittent driving means 43 and 48.

(5) Opening auxiliary line forming step S5
Next, as shown in FIG. 5, the laser light is irradiated downward from the laser light source 57 to form the opening auxiliary lines 9 and 9 relative to the body films 2 and 2 in the width direction. Specifically, the laser is irradiated while scanning the flow path forming member 4 and the second unsealed portion 15B a plurality of times along the radial direction of the flow path forming member 4, and the opening auxiliary line 9, 9 is formed (Fig. 7).

Specifically, from one gap forming seal portion 15A shown in FIGS. 1 to 3 to the other gap forming seal portion 15B, the flow path forming member 4 and the gaps 7 and 7 on both sides in the radial direction thereof are crossed. The laser is scanned, and the laser beam is applied to a range that crosses each of the cutout lines 17a and 17b formed in advance. The number of times the laser is reciprocated is arbitrary, but it is preferably set according to the output of the laser, the bag making speed, the types of the body films 2 and 2, and the like. Further, the scanning speed of the laser may be appropriately determined in consideration of the laser output. The laser can be any of 2D laser light and 3D laser light.

FIG. 8 is a diagram in which laser machining is performed with no gap between the body films 2 and 2 and the flow path forming member 4. FIG. 9 is a diagram showing a state at the time of opening when there is an unformed portion of the opening auxiliary line. FIG. 10 is a diagram in which laser machining is performed with a gap 7 between the body films 2 and 2 and the flow path forming member 4.

As shown in FIGS. 8 and 10, the bag making machine 10 moves from the laser light source 57 installed above the body films 2 and 2 to be conveyed to the body films 2 and 2 below for chamfering. The laser beam will be emitted toward it.

Here, as shown in FIG. 8, when laser processing is performed on both sides of the flow path forming member 4 in the radial direction without a gap 7 between the body films 2 and 2 and the flow path forming member 4, laser light is applied. Is partially blocked by the flow path forming member 4, and the laser beam does not sufficiently reach the region where the body films 2 and 2 are adhered to the flow path forming member 4, resulting in processing defects. There was a problem.
In this case, the opening auxiliary line 9 could not be formed satisfactorily, and as shown in FIG. 9, there was a problem that the tab 16 could not be removed at the time of opening.

On the other hand, in the present embodiment, as shown in FIG. 10, between the body films 2 and 2 and the flow path forming member 4 on both radial sides of the flow path forming member 4 at the position where the opening auxiliary line 9 is formed. A gap 7 is provided, and the seal ends 15d and 15e are located radially outside the flow path forming member 4 with respect to the tangents f and f of the flow path forming member 4.
In this case, since the seal ends 15d and 15e of the body films 2 and 2 are located away from the flow path forming member 4, the laser light is not blocked by the flow path forming member 4 and is within a predetermined processing range. The body films 2 and 2 can be uniformly irradiated with the laser beam.

(5) Separation step S6
Next, as shown in FIG. 5, the central portion of the heat-sealed body films 2 and 2 in the width direction is cut in half by the cutter 47a, and the separation line along the width direction of the body films 2 and 2 (not shown). It is separated into two packaging bags 5 and 5 by cutting according to.
In this way, a plurality of packaging bags 5 with spouts are manufactured.

As described above, in the present embodiment, the gaps 7 and 7 are provided between the seal ends 15d and 15e on both sides of the flow path forming member 4 in the radial direction at the position where the opening auxiliary line 9 is formed. , The positions of the seal ends 15d and 15e between the body films 2 and 2 are located away from the flow path forming member 4. As shown in FIG. 10, in the present embodiment, since the seal ends 15d and 15e are located radially outside the flow path forming member 4 with respect to the tangents f and f of the flow path forming member 4, the laser is used. When processing is performed, the laser light for processing is not blocked by the flow path forming member 4, and the laser light can be irradiated over a desired processing range including the seal ends 15d and 15e. As a result, the opening auxiliary line 9 can be stably formed on the body films 2 and 2 without causing processing defects.

Further, in the present embodiment, the laser beam is irradiated to the range crossing the cutout lines 17a and 17b formed in advance. As a result, the ends of the opening auxiliary lines 9 formed are connected to the cutout lines 17a and 17b. The tab 16 can be separated from the side end seal portion 5b by being opened over the cutout line 17b of the above.
As described above, according to the manufacturing method of the present embodiment, the packaging bag 5 having good openability from which the tab 16 can be easily separated can be obtained.

Although the preferred embodiments according to the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above examples.

In the above embodiment, the opening auxiliary line forming step is carried out before the separation step, but the present invention is not limited to this, and for example, the opening auxiliary line forming step may be carried out after the separating step.
Further, as shown in FIG. 10, in the above embodiment, the seal ends 15d and 15e are located radially outside the flow path forming member 4 with respect to the tangents f and f of the flow path forming member 4. The seal ends 15d and 15e may be located on the tangents f and f of the flow path forming member 4.

2 ... Body film (film), 4 ... Flow path forming member, 4a ... Tip, 5 ... Packaging bag, 7 ... Gap, 9 ... Opening auxiliary line, 14 ... Spout, 15B ... Second unsealed part (unsealed) Part), 15d, 15e ... Seal end, 25 ... Second seal part, f ... Tangent, L ... Length

Claims (5)

A packaging bag with a spout having a flow path forming member at the spout.
A pair of films that are layered on top of each other
A first seal portion provided around the pair of films and
A first unsealed portion formed between the pair of films surrounded by the first sealed portion, and a first unsealed portion.
A cylindrical flow path forming member provided in the first unsealed portion so that the rear end is exposed and serves as a flow path for the spout.
A second unsealed portion that communicates with the first unsealed portion via the flow path forming member, and a second unsealed portion.
A second seal portion for the pair of films provided along the circumferential direction in a part of the flow path forming member in the length direction, and
The flow path forming member and the opening auxiliary line formed by irradiating the pair of films with a laser beam so as to cross the second unsealed portion are provided.
The structure is such that the tip of the flow path forming member is exposed from the pair of films after opening.
The second unsealed portion is located between the seal ends of the first sealed portion on both radial sides of the flow path forming member and the tip of the flow path forming member at the position where the opening auxiliary line is formed. a gap is formed only including,
In the flow path forming member, the tip thereof is exposed in the second unsealed portion and has a substantially circular shape in a plan view, and is substantially orthogonal to the circumference of the second unsealed portion. Arranged like,
When viewed from the length direction of the flow path forming member,
The seal end at the position where the opening auxiliary line is formed is located radially outside the flow path forming member from the tangent line of the flow path forming member connecting the laser light source and the gap.
Packaging bag with spout. The distance between the seal end and the flow path forming member at the position where the opening auxiliary line is formed is 15% or more and 60% or less of the diameter of the flow path forming member.
The packaging bag with a spout according to claim 1. The length of the tip of the flow path forming member exposed from the pair of films after opening is
20% or more and 50% or less of the total length of the flow path forming member.
The packaging bag with a spout according to claim 1 or 2. When viewed from the normal direction of the film
The gap widens toward the tip side in the length direction.
The packaging bag with a spout according to any one of claims 1 to 3. A method for manufacturing a packaging bag with a spout having a flow path forming member at the spout.
By arranging the flow path forming members between the pair of films arranged to be stacked and heat-sealing these sealing portions while pressing from both sides in the thickness direction of the pair of films, the periphery of the pair of films is formed. A step of forming a first seal portion and forming a second seal portion in a part of the length direction of the flow path forming member over the circumferential direction to obtain an unsealed portion around the flow path forming member. ,
A step of forming an opening auxiliary line by performing laser processing on the sealed pair of films so as to cross the flow path forming member and the unsealed portion is provided.
In the step of obtaining the unsealed portion,
At the position where the opening auxiliary line is formed, the unsealed portion so as to form a gap between the sealed ends of the first sealed portion on both sides in the radial direction of the flow path forming member and the flow path forming member. Form and
In the process of performing the laser processing
A laser beam is irradiated so as to cross the unsealed portion and the sealed end on both sides of the fluid forming member in the radial direction along the radial direction of the flow path forming member .
When viewed from the length direction of the flow path forming member,
The seal end at the position where the opening auxiliary line is formed is located radially outside the flow path forming member from the tangent line of the flow path forming member connecting the laser light source and the gap.
Manufacturing method of packaging bag with spout.

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