JP2007238123A - Mouth member for thermoplastic resin-made bag, thermoplastic resin-made bag, and method for manufacturing thermoplastic resin-made bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mouth member for a thermoplastic resin-made bag capable of reinforcing the rigidity of a flexible mouth member itself, and preventing of an extraction port of the mouth member from being reduced after heat bonding. <P>SOLUTION: The mouth member (2) of the thermoplastic resin-made bag is a mouth member (2) which is held by one opening part of a sheet constituting the thermoplastic resin-made bag. The thickness of the mouth member (2) of a portion to be heat-bonded to the sheet is ≤0.5 mm, and the mouth member has an opening area (23) constituting the extraction port and at least one bent part (25). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a thermoplastic resin bag capable of containing various fluid substances such as beverages, foods, seasonings, pharmaceuticals, cosmetics, and detergents and various granular substances, and in particular, at the opening of the thermoplastic resin bag. The present invention relates to a mouth member to be provided, a thermoplastic resin bag having the mouth member, and a method for producing the same.

  A thermoplastic resin bag with a mouth member formed by adhering a mouth member (plug) to the opening of a thermoplastic resin bag formed by heat sealing a thermoplastic resin film is used for beverages, foods, seasonings It is widely used as a container for various fluid substances such as materials, pharmaceuticals, cosmetics and detergents and various particulate substances.

  In addition, as a mouth member (101) provided in the opening part of the thermoplastic resin bag with a mouth member mentioned above, the thing of a cylindrical shape as shown in FIG. 9 is generally known.

  However, if the cylindrical mouth member (101) shown in FIG. 9 is to be fixed to the opening of the thermoplastic resin bag (102) by heat sealing, the mouth inserted into the thermoplastic resin bag (102). On both sides of the member (101), wrinkles (103) occur with respect to the thermoplastic resin film constituting the thermoplastic resin bag (102) body, and the mouth member (101) and the thermoplastic resin bag ( 102) becomes extremely difficult, and the mouth member (101) cannot be fixed to the thermoplastic resin bag (102) with the required heat seal strength.

  In addition, the appearance of the wrinkles (103) deteriorates the aesthetic appearance of the thermoplastic resin bag (102) filled with the contents, and stress is easily concentrated at the locations where the wrinkles (103) are generated. When the thermoplastic resin bag with a mouth member (102) filled with a product is dropped, the portion where the wrinkles (103) are generated may be broken and the contents may leak out.

  In order to solve such a problem, as shown in FIG. 10, the boat-shaped portion symmetrical to the seal portion (132) of the mouth member (101) to be inserted into the thermoplastic resin bag (102). (133) is formed to realize a reliable heat seal between the mouth member (101) and the thermoplastic resin bag (102) body.

  However, since the mouth member (101) provided in the opening of the thermoplastic resin bag (102) as shown in FIG. 10 is made of an injection-molded product or the like, the outer surface of the mouth member (102) is hard. Therefore, the weldability of the thermoplastic resin bag (102) with the resin may be deteriorated.

  For this reason, as a technical document filed prior to the present invention, a spout attached to a heat seal portion of a synthetic resin bag having a heat sealable synthetic resin layer on its inner surface, the heat seal of the bag. A flexible skirt portion having a circumference smaller than the circumference of the portion and heat-sealed inward of the heat seal portion, and an extraction pipe connected to the upper portion of the skirt portion, and A heat-sealable synthetic resin layer is provided outside the skirt part where the skirt part is opposed to the heat-seal part of the bag, and a non-heat-sealable synthetic resin layer is provided inside. There is a document that discloses a spout for a synthetic resin bag that can improve the sealing performance and improve the sealing performance (see, for example, Patent Document 1).

Also, a bag making method in which a mouth member made of a preheated synthetic resin and a bag portion made of a flexible film are welded and integrated, and the end of the mouth member on the bag side during preheating ( The preheating step of softening the synthetic resin of the welded portion (mouth member welded portion) of the mouth member and the bag portion without softening the synthetic resin of the mouth member end portion), and the preheated mouth member of the bag portion And a welding step of welding the mouth member welded portion and the opening by pressing with a seal mold, and by suppressing deformation of the mouth member, a stable and uniform thin piece can be formed, There is a document that discloses a bag making method that can prevent the generation of a gap (see, for example, Patent Document 2).
Japanese Utility Model Publication No. 53-45116 JP 2004-148578 A

  The above-mentioned patent document 1 has a heat-sealable synthetic resin layer provided outside the skirt portion, a non-heat-sealable synthetic resin layer provided inside, and enables high-pressure bonding with a heat-seal bar and sealability However, since the spout has a flexible configuration, there is a possibility that the spout may be crushed when heat sealing is performed. For this reason, the said patent document 1 considered what strengthened the rigidity of the mouth member (2) which is rich in flexibility, and prevented the reduction | decrease of the extraction port of the mouth member (2) after heat welding. is not.

  Moreover, the said patent document 2 does not soften the synthetic resin of the bag side edge part (mouth member edge part) of the mouth member at the time of preheating, but welds a mouth member and a bag part (mouth member welding part). The synthetic resin is softened to prevent a decrease in the rigidity of the entire mouth member. However, the above-mentioned Patent Document 2 focuses on welding the mouth member welded portion and the opening portion by pressing with a seal mold. Therefore, it is not considered to enhance the rigidity of the flexible mouth member (2) itself and prevent the reduction of the extraction port of the mouth member (2) after heat welding.

  The present invention has been made in view of the above circumstances, and enhances the rigidity of the flexible mouth member itself and prevents the mouth port of the mouth member from being reduced after heat welding. An object of the present invention is to provide a thermoplastic resin bag and a method for producing a thermoplastic resin bag.

  In order to achieve this object, the present invention has the following features.

  The mouth member according to the present invention is a mouth member provided by being sandwiched by one opening portion of a sheet constituting a thermoplastic resin bag, and the thickness of the mouth member at the portion thermally welded to the sheet is 0. 0.5 mm or less, and has an opening region constituting the extraction port and at least one bent portion.

  In the mouth member according to the present invention, the bent portion has a concave shape recessed from the mouth member.

  In the mouth member according to the present invention, the bent portion has a convex shape protruding from the mouth member.

  Further, in the mouth member according to the present invention, the bent portion has a shape obtained by combining a convex shape protruding from the mouth member and a concave shape recessed from the mouth member continuously or discontinuously. is there.

  In addition, the mouth member according to the present invention is characterized in that a protrusion is provided on the outer peripheral surface of the mouth member that is thermally welded to the sheet, and the protrusion is provided with an opening region.

  A thermoplastic resin bag according to the present invention has the above-described mouth member.

  The method for manufacturing a thermoplastic resin bag according to the present invention is formed by sandwiching a mouth member having an opening region constituting an extraction port in one opening portion of a sheet constituting the thermoplastic resin bag. A method for manufacturing a thermoplastic resin bag comprising: a mouth member forming step for forming a mouth member having at least one bent portion; and a mouth member having a bent portion formed by the mouth member forming step. The sheet is sandwiched between sheets constituting the bag making, and a welding process is performed in which a mouth plate and the sheet are thermally welded using a flat plate.

  Moreover, in the manufacturing method of the thermoplastic resin bag according to the present invention, the mouth member forming step further includes a protrusion provided with an opening region on the outer peripheral surface facing the diameter line of the mouth member thermally welded to the sheet. The mouth member is formed, and in the welding step, the mouth member further having a protrusion provided with an opening region is sandwiched between the sheets constituting the thermoplastic resin bag, and the mouth member is placed on the extension line on the diameter line of the mouth member. The member and the sheet are heat-welded so as to be integrated.

  The present invention is a mouth member provided to be sandwiched between one opening portion of a sheet constituting a thermoplastic resin bag, and the thickness of the mouth member of the portion thermally welded to the sheet is 0.5 mm or less. And having an opening region constituting the extraction port and at least one bent portion. Thereby, it becomes possible to reinforce the rigidity of the highly flexible mouth member (2) itself and to prevent the extraction port of the mouth member (2) after heat welding from being reduced.

  First, the characteristics of the mouth member of the thermoplastic resin bag according to this embodiment will be described with reference to FIGS. 3 and 4.

  The mouth member (2) of the thermoplastic resin bag in the present embodiment is the mouth member (2) provided by being sandwiched by one opening of the sheet (11) constituting the thermoplastic resin bag, The thickness of the mouth member (2) at the portion to be thermally welded to (11) is 0.5 mm or less, and has an opening region (23) constituting the extraction port and at least one bent portion (25). It is characterized by this. As a result, as shown in FIG. 4B, when the mouth member (2) and the sheet (11) are heat welded using the flat plate (12), the opening region (23) constituting the extraction port is formed. Even if it becomes narrow, the rigidity of the bent portion (25) provided in the mouth member (2) can enhance the rigidity of the mouth member (2) itself. The restoring stress to be restored to the opening region (23) shown is applied to the mouth member (2), and the state of the opening region (23) shown in FIG. 4 (c) can be constructed. Thereby, the rigidity of the flexible mouth member (2) itself is strengthened, the restoring force of the mouth member (2) after heat welding using the flat plate (12) is improved, and the opening constituting the extraction port It becomes possible to prevent the area (23) from being reduced. The thermoplastic resin mouth member (2) in the present embodiment will be described below with reference to the accompanying drawings.

(First embodiment)
First, the thermoplastic resin bag (1) in this embodiment will be described with reference to FIGS. 1 shows an external view of the thermoplastic resin bag (1) in the present embodiment, and FIG. 2 shows a state in which the thermoplastic resin bag (1) shown in FIG. 1 is cut along “A”. FIG.

  As shown in FIG. 1 and FIG. 2, the thermoplastic resin bag (1) in the present embodiment includes a sheet (11) constituting the thermoplastic resin bag (1) and the thermoplastic resin bag (1). And a mouth member (2) that constitutes the opening. In addition, as a material applicable to a sheet | seat (11) and a mouth member (2), thermoplastic resins, such as polyethylene and a polypropylene, are mentioned. In addition, as shown in FIG. 2, the mouth member (2) in this embodiment has a hollow cylindrical opening region (23) that constitutes the extraction port.

  Next, the configuration of the mouth member (2) constituting the opening of the thermoplastic resin bag (1) in this embodiment will be described with reference to FIG. FIG. 3 is a diagram showing the shape of the mouth member (2) in the present embodiment, (a) shows an external view of the mouth member (2) in the present embodiment, and (b) shows (a) ) Is a view showing a state in which the mouth member (2) shown in FIG. 5 is cut along “A”, and (c) is a state in which the mouth member (2) shown in (a) is cut along “B”. (D) is a figure which shows the state which cut | disconnected the mouth member (2) shown to (a) along "C".

  As shown in FIG. 3, the mouth member (2) in the present embodiment is configured to have at least one bent portion (25) that reinforces the rigidity of the mouth member (2). In addition, the full length of the mouth member (2) in this embodiment is 37 mm, the full length of the extraction | pouring part (3) which comprises the part which pours out the contents from a mouth member (2) is 8 mm, and a sheet | seat The total length of the welded part (4) constituting the part to be welded with (11) is 26.6 mm, and the total length of the bent part (25) is 2.4 mm. Further, the outer diameter Φ of the extraction part (3) is 9.4 mm, the inner diameter Φ is 7 mm, and the thickness of the extraction part (3) is 1.2 mm. The outer diameter Φ of the welded part (4) is 16 mm, the inner diameter Φ is 15 mm, and the thickness of the welded part (4) is 0.5 mm. The outer diameter diameter Φ of the bent portion (25) is 14 mm, the inner diameter diameter Φ is 11.6 mm, and the thickness of the bent portion (25) is 1.2 mm. Moreover, the thickness of the sheet | seat (11) which comprises the thermoplastic resin bag (1) of this embodiment is 0.195 mm. In addition, the bending part (25) in this embodiment is provided in the terminal part of the mouth member (2). Further, as the thickness of the welded portion (4) of the mouth member (2), in consideration of the point of thermal welding with the sheet (11) constituting the thermoplastic resin bag (1) using the flat plate (12), 0.5 mm or less is preferable and 0.3 mm-0.35 mm is still more preferable.

  Next, a manufacturing method of the thermoplastic resin bag (1) having the mouth member (2) in the present embodiment will be described with reference to FIGS.

  First, as shown in FIG. 3, the mouth member (2) having an opening region (23) constituting the extraction mouth and a bent portion (25) for reinforcing the rigidity of the mouth member (2) itself is formed.

  Next, as shown in FIG. 4A, the mouth member (2) having the opening region (23) and the bent portion (25) is formed into a sheet (11) constituting the thermoplastic resin bag (1). ) And, as shown in FIG. 4 (b), using the flat plate (12), the mouth member (2) and the sheet (11) are heat-welded so as to be integrated. As a result, as shown in FIG. 4C, the sheet (11) is welded along the outer peripheral edge of the mouth member (2), and the thermoplastic resin with the mouth member (2) shown in FIGS. Bag-making (1) will be formed.

  Since the mouth member (2) in the present embodiment has a bent portion (25) that reinforces the rigidity of the mouth member (2) itself, as shown in FIG. Even if the opening member (2) and the sheet (11) are heat-sealed so as to be integrated using (12), the opening region (23) constituting the extraction port is narrowed. The mouth member (2) is subjected to a restoring stress to be restored in the opening region (23) shown in FIG. 4A due to the rigidity of the bent portion (25). For this reason, the state of the opening region (23) shown in FIG. 4 (c), which is larger than the state of the opening region (23) shown in FIG. 4 (b) formed when the flat plate (12) is heat-welded. It becomes possible to construct. For example, the diameter of the opening region (23) after the mouth member (2) having no bent portion (25) and the sheet (11) are sandwiched and thermally welded using the flat plate (12) is about 2 mm. On the other hand, as in the present embodiment, the mouth member (2) having the bent portion (25) and the sheet (11) are sandwiched by using the flat plate (12) and thermally welded. The diameter of the opening region (23) shown in FIG. 4C is about 10 mm, and it is possible to prevent the opening region (23) constituting the extraction port from being reduced.

  As described above, the mouth member (2) in the present embodiment has a bent portion (25) that reinforces the rigidity of the mouth member (2), as shown in FIG. ), When the opening member (2) and the sheet (11) are thermally welded using the flat plate (12), even if the opening region (23) constituting the extraction port is narrowed, Because the rigidity of the bent portion (25) provided in the mouth member (2) can enhance the rigidity of the mouth member (2) itself, the opening region (23) shown in FIG. The restoring stress to be restored is applied, and the state of the opening region (23) shown in FIG. 4C can be constructed.

  In addition, the shape of the bending part (25) provided in the mouth member (2) of this embodiment is a bending part (25) which consists of a concave shape recessed from the mouth member (2), as shown to Fig.3 (a). However, the bent portion (25) of any shape can be provided in the mouth member (2) as long as it has a shape that enhances the rigidity of the mouth member (2). For example, FIG. ), A convex shape protruding from the mouth member (2), a concave shape recessed from the mouth member (2), and a convex shape protruding from the mouth member (2) as shown in FIG. It is also possible to provide the mouth member (2) with a bent portion (25) having a shape in which and are combined. In addition, as shown in FIG.5 (b), the bending part (25) comprised by combining convex shape and concave shape is formed by forming convex shape and concave shape continuously. It is also possible to form them discontinuously.

  Further, the position where the bent portion (25) is provided in the mouth member (2) is not limited to the end portion of the mouth member (2) as shown in FIGS. 3 and 5, but is shown in FIG. 4 (b). Thus, even when the opening member (2) and the sheet (11) are thermally welded using the flat plate (12), even if the opening region (23) constituting the extraction port is narrowed, FIG. If the restoring stress to be restored is applied to the opening region (23) shown in a) and the state of the opening region (23) shown in FIG. It is possible to provide a bend (25) at the position. Further, the number of the bent portions (25) provided in the mouth member (2) is not limited to one as shown in FIG. 3, and a plurality of bent portions (25) are provided in the mouth member (2). Is also possible.

(Second Embodiment)
Next, a second embodiment will be described.

  As shown in FIG. 6, the mouth member (2) in the second embodiment is configured to have a protrusion (21) provided with an opening region (24) on the outer peripheral surface of the mouth member (2). It is characterized by this. As shown in FIG. 7 (b), the protrusion (21) having the opening region (24) is provided on the outer peripheral surface of the mouth member (2) to be welded to the sheet (11). As shown, when the mouth member (2) and the sheet (11) are thermally welded using the flat plate (12), the opening region (24) provided in the protrusion (21) shown in FIG. The “upper and lower width” is compressed more than the mouth member (2) of the first embodiment. For this reason, in the mouth member (2) of the second embodiment, the restoring stress is increased as compared with the mouth member (2) of the first embodiment by the “vertical width” of the opening region (24). The restoring stress to be restored in the opening region (23) shown in FIG. 7 (a) is applied to the mouth member (2) more than in the first embodiment. Therefore, it is possible to construct the state of the opening region (23) shown in FIG. 7 (c) than the mouth member (2) of the first embodiment. Hereinafter, the mouth member (2) in the second embodiment will be described with reference to FIGS.

  First, the configuration of the mouth member (2) that constitutes the opening of the thermoplastic resin bag (1) in the second embodiment will be described with reference to FIG. FIG. 6 is a view showing the shape of the mouth member (2) in the second embodiment, (a) is an external view of the mouth member (2) in the second embodiment, and (b). FIG. 6 is a view showing a state in which the mouth member (2) shown in FIG. 5A is cut along “A”, and FIG. 5C is a view showing the mouth member (2) shown in FIG. It is a figure which shows the state cut | disconnected, (d) is a figure which shows the state which cut | disconnected the opening member (2) shown to (a) along "C".

  As shown in FIG. 6, the mouth member (2) in the second embodiment has an outer periphery on the diameter line of the mouth member (2) to be welded with the sheet (11) constituting the thermoplastic resin bag (1). It has a protrusion (21) with respect to the surface. In addition, as shown in FIG.6 (c), the projection part (21) is provided with the opening area | region (24). The mouth member (2) has a hollow cylindrical opening region (23) that constitutes the extraction port. In addition, the full length of the mouth member (2) in 2nd Embodiment is 37 mm, and the full length of the extraction | pouring part (3) which comprises the part which pours out the contents from a mouth member (2) is 8 mm. The total length of the welded portion (4) constituting the portion welded to the sheet (11) is 26.6 mm, the total length of the bent portion (25) is 2.4 mm, and the total length of the protruding portion (21) is 15 mm. Further, the outer diameter Φ of the extraction part (3) is 9.4 mm, the inner diameter Φ is 7 mm, and the thickness of the extraction part (3) is 1.2 mm. The outer diameter Φ of the welded part (4) is 16 mm, the inner diameter Φ is 15 mm, and the thickness of the welded part (4) is 0.5 mm. The outer diameter diameter Φ of the bent portion (25) is 14 mm, the inner diameter diameter Φ is 11.6 mm, and the thickness of the bent portion (25) is 1.2 mm. Moreover, the thickness of the sheet | seat (11) which comprises the thermoplastic resin bag (1) of 2nd Embodiment is 0.195 mm. In addition, the protrusion part (21) in this embodiment is provided so that the upper end of a protrusion part (21) may be located in the position of 10 mm from the upper end of a welding part (4). Further, as the thickness of the welded portion (4) of the mouth member (2), in consideration of the point of thermal welding with the sheet (11) constituting the thermoplastic resin bag (1) using the flat plate (12), 0.5 mm or less is preferable and 0.3 mm-0.35 mm is still more preferable.

  Next, a manufacturing method of the thermoplastic resin bag (1) having the mouth member (2) in the second embodiment will be described with reference to FIGS.

  First, as shown in FIG. 6, a mouth member (2) having a projection (21) provided with an opening region (24) and a bent portion (25) is formed.

  Next, as shown in FIG. 7 (a), the mouth member (2) having the protruding portion (21) provided with the opening region (24) and the bent portion (25) is made of a thermoplastic resin bag. As shown in FIG. 7 (b), the sheet member (11) constituting (1) is used, and the flat member (12) is used to extend the mouth member (2) having the protrusion (21) on the diameter line. On the line, the mouth member (2) and the sheet (11) are sandwiched, and the mouth member (2) and the sheet (11) are heat-welded so as to be integrated. Thus, as shown in FIG. 7C, the sheet (11) is completely thermally welded along the outer peripheral edge of the mouth member (2), and the thermoplastic resin with the mouth member (2) shown in FIG. Bag-making (1) will be formed.

  In addition, when the mouth member (2) in 2nd Embodiment heat-welds the mouth member (2) and a sheet | seat (11) using a flat plate (12), as shown in FIG.7 (b), Even if the opening region (23) of the mouth member (2) is narrowed, the mouth member (2) has an opening region (24) provided in the protrusion (21) shown in FIG. It is compressed more than the mouth member (2) of the first embodiment by the “vertical width”. For this reason, in the mouth member (2) in the second embodiment, the restoring stress increases by the amount of “vertical width” of the opening region (24) as compared with the mouth member (2) in the first embodiment. As a result, the restoring stress to be restored in the opening region (23) shown in FIG. 7A is applied to the mouth member (2) more than in the first embodiment. Therefore, the mouth member (2) in the second embodiment can construct the state of the opening region (23) shown in FIG. 7 (c) than the mouth member (2) of the first embodiment. Become.

  As described above, the mouth member (2) in the second embodiment has the protrusion (21) provided with the opening region (24) and the bent portion (25), and the mouth member (2) itself. The opening region (23) shown in FIG. 7 (b) is formed when heat welding is performed using the flat plate (12) because the rigidity of the mouth member (2) of the first embodiment is improved. It is possible to construct a state of the opening region (23) shown in FIG. For example, the diameter of the opening region (23) after the mouth member (2) having no bent portion (25) and the sheet (11) are sandwiched and thermally welded using the flat plate (12) is about 2 mm. On the other hand, as in the second embodiment, the mouth member (2) having the protrusion (21) provided with the opening region (24) and the bent portion (25), and the sheet ( 11) is sandwiched by using the flat plate (12) and thermally welded, the diameter of the opening region (23) shown in FIG. 7 (c) is about 12 mm, and the reduction of the opening region (23) is the first. It becomes possible to prevent further than the mouth member (2) of 1 embodiment.

  In addition, since the mouth member (2) in the second embodiment is configured to have the protrusion (21), the sheet (11) is disposed on the outer peripheral edge of the protrusion (21) of the mouth member (2). It is possible to form the thermoplastic resin bag (1) with the mouth member (2) shown in FIG. Furthermore, since the mouth member (2) in the second embodiment is provided with the opening region (24) with respect to the protrusion (21), as shown in FIG. When heat welding is performed along the outer peripheral edge of the mouth member (2), the resin (20) constituting the protrusion (21) flows out into the opening region (24), and the resin (20) that flows out causes the resin (20) to flow out. As shown in FIG. 7C, the bulging portion (22) is formed in the opening region (24). Thereby, resin (20) which comprises a projection part (21) flows out to an opening area | region (23), and a bulging part (22) is not formed in the opening area | region (23) of a mouth member (2). Therefore, it is possible to prevent the opening area (23) of the mouth member (2) from being reduced.

  As described above, the thermoplastic resin bag (1) according to the second embodiment includes the protrusion (21) provided with the opening region (24) and the mouth member (2) having the bent portion (25). On the extension line on the diameter line of the mouth member (2) having the protrusion (21) using the flat plate (12), sandwiched by the sheet (11) constituting the thermoplastic resin bag (1), By thermally welding so that the mouth member (2) and the sheet (11) are integrated, the bulging portion (22) is formed in the opening region (24), and the sheet (11) is The thermoplastic resin bag (1) with the mouth member (2) is formed by welding completely along the outer peripheral edge of the mouth member (2). Thereby, it becomes possible to prevent the opening area (23) of the mouth member (2) from being reduced.

  The mouth member (2) in the second embodiment described above has a projection (21) provided with an opening region (24) as shown in FIGS. 6 and 7, but the opening region ( The shape of 24) is not particularly limited, and any shape can be used as long as the opening region (24) has such a shape that the resin (20) constituting the protrusion (21) does not flow out to the opening region (23). It is possible to provide the opening region (24) in the protrusion (21). In addition, as an opening area | region (24) provided in a projection part (21), as shown to FIG. 6, FIG. 7, the opening area | region (24) provided in a projection part (21), and the opening area | region of a mouth member (2) (23) may be integrated with each other, or as shown in FIG. 8, the opening region (24) and the opening region (23) of the mouth member (2) may be separated and independent. Is possible.

  Further, the shape of the protrusion (21) is not particularly limited, and any shape of the protrusion (21) can be used as long as the sheet (11) can be welded along the outer peripheral edge of the mouth member (2). It can be provided on the outer peripheral surface facing the diameter line of the mouth member (2). Further, the position where the protrusion (21) is provided is not particularly limited, and any position can be used as long as it is the position of the welded portion (4) to be welded to the sheet (11) constituting the thermoplastic resin bag (1). It is possible to provide a protrusion (21).

  The above-described embodiment is a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiment alone, and various modifications are made without departing from the gist of the present invention. Implementation is possible.

  For example, in the thermoplastic resin bag (1) in the above embodiment, the mouth member (2) is provided on the upper left end of the thermoplastic resin bag (1) as shown in FIG. The position where the mouth member (2) is provided is not particularly limited, and the mouth member (2) can be provided at any position. Moreover, the formation method at the time of forming the mouth member (2) in this embodiment is not specifically limited, As long as the mouth member (2) of a structure rich in flexibility can be formed, all formation methods should be applied. Is possible.

  The thermoplastic resin bag mouthpiece, the thermoplastic resin bag, and the thermoplastic resin bag manufacturing method according to the present invention include various fluid substances such as beverages, foods, seasonings, pharmaceuticals, cosmetics, and detergents, and various granular substances. It is applicable to the bag which accommodates.

It is a figure which shows the external appearance of the thermoplastic resin bag (1) in this embodiment. It is a figure which shows the state which cut | disconnected the thermoplastic resin bag (1) shown in FIG. 1 along "A". It is a figure which shows the shape of the mouth member (2) in this embodiment, (a) shows the external view of the mouth member (2) in this embodiment, (b) is the mouth member (a) shown to (a). (C) is a diagram showing a state where the mouth member (2) shown in (a) is cut along "B". (d) is a figure which shows the state which cut | disconnected the mouth member (2) shown to (a) along "C". It is a figure which shows the manufacturing method of the thermoplastic resin bag (1) which has a mouth member (2) in this embodiment. It is a figure which shows the modification of the shape of the opening | mouth member (2) in this embodiment. It is a figure which shows the shape of the opening | mouth member (2) in 2nd Embodiment. It is a figure which shows the manufacturing method of the thermoplastic resin bag (1) which has a mouth member (2) in 2nd Embodiment. It is a figure which shows the modification of the shape of the opening | mouth member (2) in 2nd Embodiment. It is a 1st figure which shows the structure of the thermoplastic resin bag (102) which has the conventional opening | mouth member (101). It is a 2nd figure which shows the structure of the thermoplastic resin bag (102) which has the conventional opening | mouth member (101).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Thermoplastic resin bag 2 Opening member 3 Outlet part 4 Welding part 11 Sheet | seat 12 Flat plate 20 Resin 21 Protrusion part 22 Expansion part 23, 24 Opening area 25 Bending part 101 Opening member 102 Thermoplastic resin bag 103 Wrinkle 132 Seal Part 133 boat form part

Claims (8)

A mouth member provided to be sandwiched between one opening portion of a sheet constituting a thermoplastic resin bag,
The thickness of the mouth member of the portion thermally welded to the sheet is 0.5 mm or less,
An opening area constituting the extraction port;
An oral member having at least one bent portion.   The mouth member according to claim 1, wherein the bent portion has a concave shape recessed from the mouth member.   The mouth member according to claim 1, wherein the bent portion has a convex shape protruding from the mouth member.   The mouth member according to claim 1, wherein the bent portion has a shape obtained by combining a convex shape protruding from the mouth member and a concave shape recessed from the mouth member continuously or discontinuously.   5. The method according to claim 1, wherein a protrusion is provided on an outer peripheral surface of the mouth member at a portion that is thermally welded to the sheet, and the protrusion includes an opening region. The mouth member described.   A thermoplastic resin bag having the mouth member according to any one of claims 1 to 5. A method for producing a thermoplastic resin bag formed by sandwiching a mouth member having an opening region constituting an extraction port in one opening portion of a sheet constituting a thermoplastic resin bag,
A mouth member forming step of forming a mouth member having at least one bent portion;
The mouth member having the bent portion formed by the mouth member forming step is sandwiched between sheets constituting the thermoplastic resin bag, and the mouth member and the sheet are thermally welded using a flat plate. And a process for producing a thermoplastic resin bag. The mouth member forming step includes
Forming the mouth member further having a protrusion provided with an opening region on the outer peripheral surface on the diameter line of the mouth member thermally welded to the sheet;
The welding process includes
The mouth member further having a projection provided with the opening region is sandwiched by a sheet constituting the thermoplastic resin bag, and on the extension line on the diameter line of the mouth member, the mouth member and the sheet The method for manufacturing a thermoplastic resin bag according to claim 7, wherein heat welding is performed so as to be integrated.

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