JP5399107B2 - Method for producing spouted container - Google Patents

Description

  The present invention relates to a spouted container used as a packaging container for, for example, a liquid beverage, a fluid food, an infusion bag (for example, an infusion bag), a refill liquid detergent, and various powders. More specifically, the present invention relates to a spout-equipped container in which a cylindrical spout used as a drinking mouth, a spout or a take-out port for contents is attached to a bag-like container body that contains the contents.

  Conventionally, a cylindrical spout that can be crushed elastically is used, and one end of the spout is sandwiched between one edge of the film that constitutes the front and back of the container body. In a method of manufacturing a container with a spout that is crushed and heat-sealed with a spout, a method of reworking by inserting a cylindrical forming rod into a spout crushed during heat-sealing and heating in a heating furnace is known. (For example, refer to Patent Document 1).

  In addition, when one end of a cylindrical spout is sandwiched between the edges of the film that constitutes the front and back of the container body, and sandwiched by a seal bar from the top of the film, the film and the spout are heat-sealed. There is also known a method for manufacturing a spout-equipped container in which a member is inserted to prevent the spout from being crushed, while heat sealing is performed using a seal bar having a recess corresponding to the swelling caused by the spout sandwiched between the films (for example, Patent Document 2).

JP-A-10-273154 Japanese Patent Laid-Open No. 2001-240083

  In the case of the manufacturing method of the container with a spout of the said patent document 1, there exists an advantage which can be manufactured using a general flat seal bar. However, in order to insert the forming rod into the spout and reheat it, not only has to be provided with a heating means for reheating in the production line of the spouted container, but additional reprocessing time due to reheating is added. There is a problem that manufacturing time is reduced due to extra manufacturing time.

  Moreover, in the case of the manufacturing method of the container with a spout of the said patent document 2, there exists an advantage which can prevent the flattening of the above spouts. However, it is necessary to prepare a special seal bar in which a concave portion corresponding to the swelling caused by the spout sandwiched between the films is prepared, and there is a problem in that a sealing failure between the film and the spout is likely to occur due to a slight deviation of the concave portion. .

  The present invention has been made in view of the above-described conventional problems, and can be performed using a general flat seal bar. In the method for manufacturing a spout-equipped container, the spout is crushed and thermally fused to the film. It is possible to prevent the spout from being flattened without being fully restored from the crushed state after heat fusion without preparing new heating means or adding new processing time. The purpose is to do so.

  For the above purpose, the present invention provides a method for producing a spouted container in which a cylindrical spout that can be crushed elastically is thermally fused to a bag-shaped container body. One end of the spout is sandwiched between one edge, sandwiched by a seal bar from above the film along one edge of the film, and the spout is crushed, and the left and right films of the spout and the film and the spout are heat-sealed. After that, the molding rod is inserted into the spout while at least the heat-sealed part with the spout film is kept at a temperature higher than the softening point of the synthetic resin constituting the spout due to the residual heat at the time of heat-sealing. The present invention provides a method for producing a spout-equipped bag, which is cooled in a state in which crushing of the bag is corrected.

In addition, the present invention is similar to the cross-sectional inner peripheral shape of the spout before being crushed and thermally fused to the film,
The cross-sectional inner peripheral shape of the spout and the cross-sectional outer peripheral shape of the forming rod are circular,
Use a flat seal bar as a seal bar to crush the spout and heat-seal the film and spout.
Is included as a preferred embodiment thereof.

  According to the present invention, since the molded rod is inserted into the spout and cooled in a state in which the spout crush is corrected, if the molded rod is removed after cooling, a spout-equipped container in which spout crush is corrected is obtained. Can do. In the present invention, correction of the crushing is performed in the cooling process after heat fusion using the residual heat at the time of heat fusion, so it is necessary to provide new heating means on the production line of the spouted container. And does not extend manufacturing time.

  The cross-sectional outer peripheral shape of the forming rod is similar to the cross-sectional inner peripheral shape of the spout before being crushed and heat-sealed with the film, especially when both are circular, it becomes easy to correct the spout crush. .

  Further, according to the present invention, since spout crushing can be corrected, a flat seal bar can be used, and a special seal bar having a concave portion is prepared, or the labor of alignment with the concave portion is omitted. be able to.

It is a top view of the state which inserted | pinched the one end part of the spout between the films which comprise the front and back of a bag-shaped container main body. It is an AA expanded sectional view in FIG. It is an expanded sectional view corresponding to AA of Drawing 1 in the state where a seal bar was pressed from the film which pinched spout, and a spout was crushed. FIG. 2 is an enlarged cross-sectional view corresponding to A-A in FIG. 1 in a state where pressing of the seal bar is released after completion of heat fusion by the seal bar. It is an expanded sectional view corresponding to AA of Drawing 1 in the state where a forming stick was inserted in a spout heat-sealed between films. It is an expanded sectional view corresponding to AA of Drawing 1 in the state where a forming rod was extracted from the state of Drawing 5. It is a top view of the manufactured container with a spout. (A)-(c) is a figure which shows the cross-sectional shape example of a spout, respectively.

  The present invention will be described below with reference to the drawings.

  FIGS. 1-7 is explanatory drawing which shows the procedure of the manufacturing method of the container with a spout concerning this invention, FIG. 1 is the plane of the state which pinched | interposed the one end part of the spout between the films which comprise the front and back of a bag-shaped container main body. FIG. 2, FIG. 2 is an AA enlarged cross-sectional view in FIG. 1, and FIG. 3 is an enlarged cross-sectional view corresponding to A-A in FIG. 1 in a state in which the spout is crushed by pressing a seal bar on the film sandwiching the spout. 4 is an enlarged cross-sectional view corresponding to AA of FIG. 1 in a state where the pressing of the seal bar is released after completion of the heat fusion by the seal bar, and FIG. 5 is formed in a spout heat-sealed between the films. FIG. 6 is an enlarged cross-sectional view corresponding to AA in FIG. 1 in a state where the rod is inserted, FIG. 6 is an enlarged cross-sectional view corresponding to AA in FIG. It is a top view of the manufactured container with a spout.

  First, as shown in FIGS. 1 and 2, one end of the spout 3 is sandwiched between one edge of the films 2 and 2 that constitute the front and back of the bag-like container body 1. Usually, as shown in FIG. 1, the spout 3 is sandwiched by leaving all or a part of one edge of the films 2 and 2 into which the spout 3 is inserted unfused and heat-bonding the other edges. It is preferable that the spout 3 is sandwiched between the films 2 and 2 in a stable state. In FIG. 1, 4a and 4a are side edge fused portions, 4b is a bottom edge fused portion 4c, and an upper edge fused portion.

  As the films 2 and 2 constituting the front and back of the container body 1, for example, a laminated film in which a base material layer such as polyamide, polyester, or polypropylene and a heat-sealing layer such as polyethylene or polypropylene are laminated can be used. The films 2 and 2 are stacked with the heat-sealing layer inside.

  The spout 3 is a cylindrical member that can be crushed. For example, a cylindrical member such as polyethylene, polypropylene, or polyester can be used. The spout 1 may have a single-layer structure or a multilayer structure. However, in order to obtain good heat-fusibility with the films 2 and 2, at least the outer surface of the spout 1 is the heat-fusible layer of the films 2 and 2 described above. It is preferable that it is comprised with the same kind of resin.

  Next, as shown in FIG. 3, the seal bars 4, 4 are pressed from above the films 2, 2 along one edge of the films 2, 2 sandwiching the spout 3, and the spout 3 is crushed flatly. Then, the films 2 and 2 and the spout 3 are heat-sealed to each other. At the same time, the edges of the left and right films 2 and 2 of the spout 3 are also heat-sealed.

  After the heat fusion, when the seal bars 5 and 5 are released and the pressing of the seal bars 5 and 5 is released, the spout 3 returns to the original open state to some extent due to its elastic recovery force. As shown, the film cannot be completely restored, and remains in a state of being crushed particularly on the heat-sealing side with the films 2 and 2.

  Therefore, in the present invention, the forming rod 6 is inserted into the spout 3 shown in FIG. 4, and the crushed state is corrected to the original state or a state close thereto. The insertion of the forming rod 6 is performed so that at least the heat-sealed portion of the spout 3 with the films 2 and 2 has a residual heat at the time of heat-sealing by the seal bars 5 and 5 so that the correction can be reliably performed. The temperature is lower than the melting point of the synthetic resin constituting the resin, preferably 10 ° C. higher than the softening point and lower than the melting point. By inserting the forming rod 6 into the spout 3 with at least the heat-sealed portions of the spout 3 and the films 2 and 2 maintained at the above temperature, the spout 3 can be reshaped into a large open state.

  The formed rod 6 is preferably a rod-like body having a diameter slightly smaller than the inner diameter of the original spout 3 (spout 3 before being crushed by the seal bars 5 and 5) so that it can be easily inserted into the spout 3. The cross-sectional outer peripheral shape of the forming rod 6 is preferably a shape similar to the initial cross-sectional inner peripheral shape of the spout 3. In particular, the outer peripheral shape of the cross section of the forming rod 6 and the initial inner peripheral shape of the cross section of the spout 3 are preferably circular, but they may be different shapes. Moreover, it is preferable to insert the forming rod 6 until it penetrates the spout 3.

  After the molding rod 6 is inserted, at least the spout 3 is kept inserted until it is cooled to a temperature lower than the softening point of the constituent synthetic resin, preferably 20 ° C. or more lower than the softening point. Thereby, the spout 3 can be fixed to the shape corrected by the forming rod 6. This cooling may be performed at room temperature or under cooled air.

  After the cooling, when the forming rod 6 is pulled out from the spout 3, as shown in FIG. 6, the original spout 3 or the spout 3 in an open state close thereto is obtained.

  As described above, as shown in FIG. 7, a spout-equipped bag in which the spout 3 is attached to the spout attachment edge fused portion 4d formed by the seal bars 5 and 5 can be obtained. The contents can be injected from the spout 3. Alternatively, the bottom edge portion may be left unfused, and after the contents are injected therefrom, the bottom edge fusion portion 4b may be formed and sealed. After the spout 3 is attached, the cap 7 is attached to the outer end of the spout 3.

  The container body 1 may have any form such as a three-sided or four-sided sealed flat bag, a self-standing bag having a bottom surface (standing pouch), and a gusset bag.

  Next, the cross-sectional shape of the spout 3 will be described with reference to FIG.

  As the spout 3, a cylindrical one as shown in FIG. 8A can be used. When the thickness of the spout 3 is sufficiently thicker than the thickness of the films 2 and 2 constituting the container body 1 described above, the inner surface of the spout 3 is heat-sealed by the seal bars 5 and 5 described in FIG. It is possible to prevent comrades from being heat-sealed. When the thickness of the spout 3 is thin, the spout 3 has a laminated structure, and the synthetic resin constituting the inner surface is made of a synthetic resin having a higher melting point than the synthetic resin constituting the outer surface. Wearing can be prevented. Further, the same effect can be obtained by adding a powdery inorganic pigment such as titanium oxide to the synthetic resin constituting the inner surface, or by applying a satin finish to the inner surface of the spout 3. In addition, the spout 3 can also be made into an elliptical cylinder shape other than a cylindrical shape.

  Further, as shown in FIG. 8 (b), when the protruding portions 8 and 8 are formed on the outer surface in the direction orthogonal to the crushing direction by the seal bars 5 and 5 described in FIG. By being sandwiched between the films 2 and 2 and heat-sealed, it becomes difficult to cause poor sealing between the spout 3 and the heat-sealed portions between the films 2 and 2 adjacent to the left and right of the spout 3.

  Further, as shown in FIG. 8C, the thickness of the spout 3 in the direction perpendicular to the crushing direction is larger than the thickness of the spout 3 in the crushing direction by the seal bars 5 and 5 described in FIG. It is also possible to prevent the inner surfaces of the spout 3 from being heat-sealed with each other when the seal bars 5 and 5 described with reference to FIG. More specifically, when the crushing direction by the seal bars 5 and 5 is the vertical direction, if the thick portion is located in the left-right direction, that is, on both ends of the crushed spout 3, this thickness is The thick portion supports the left and right end portions of the spout 3 against the crimping force, and thereby, when the spout 3 is crushed, it is suppressed that the upper and lower inner surfaces of the spout 3 are strongly pressed against each other. Therefore, it is possible to prevent the inner surfaces of the spout 3 from being thermally fused when being crushed by the seal bars 5 and 5 described with reference to FIG.

  8B and 8C, the vertical direction on the drawing is the crushing direction of the spout 3.

DESCRIPTION OF SYMBOLS 1 Container body 2 Film 3 Spout 4a Side edge fusion | fusion part 4b Bottom edge fusion | fusion part 4c Upper edge fusion | fusion part 4d Spout attachment edge fusion | fusion part 5 Seal bar 6 Forming rod 7 Cap 8 Protrusion part

Claims (4)

In the method for manufacturing a spouted container in which a cylindrical spout that can be crushed elastically is heat-sealed to a bag-shaped container body,
One end of the spout is sandwiched between the edges of the film that constitutes the front and back of the container body. After being attached, at least the heat-sealed part with the spout film is inserted into the spout while maintaining the temperature above the softening point of the synthetic resin constituting the spout due to the residual heat during the heat-sealing, A method for producing a bag with a spout, characterized by cooling in a state in which the spout is crushed.   The method of manufacturing a bag with a spout according to claim 1, wherein the outer peripheral shape of the cross section of the forming rod is similar to the inner peripheral shape of the cross section of the spout before being crushed and thermally fused to the film.   The method for producing a spout-equipped bag according to claim 2, wherein the cross-sectional inner peripheral shape of the spout and the cross-sectional outer peripheral shape of the forming rod are circular.   The method for producing a bag with a spout according to any one of claims 1 to 3, wherein a flat seal bar is used as a seal bar for crushing the spout and thermally fusing the film and the spout.

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