JP5399108B2 - 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, depending on the shape of the spout, such as a tapered spout, for example, there is a problem that a forming rod having a cross-sectional shape suitable for restoring crushing cannot be inserted into the spout and cannot be applied.

  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. An object of the present invention is to make it possible to easily prevent the spout from being flattened without being sufficiently restored from the crushed state even after heat fusion, regardless of the shape of the spout.

  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 the top of the film along one edge of the film, and the spout is crushed. After the heat treatment, at least the heat-sealed part of the spout film is held at a temperature equal to or higher than the softening point of the synthetic resin constituting the spout, and the spout is gripped between the left and right films. A method for manufacturing a spout-equipped bag is provided, which is cooled in a state where the spout is crushed and pressed in the center direction.

Further, the present invention constitutes the spout by correcting the temperature of at least the heat-sealed portion with the spout film at the time of correcting spout crushing by using the left and right films of the spout and the residual heat at the time of heat-sealing the film and the spout. The temperature is higher than the softening point of the synthetic resin,
Softening of the synthetic resin that constitutes the spout by heating at least the temperature of the heat-sealed part of the spout film with the spout film and the film and the spout after heat-sealing when correcting spout crushing Temperature above the point,
At least heat-seal part with the spout film, heat-seal the film between the left and right films of the spout and between the film and the spout;
And crushing the spout, as a seal bar to perform the heat fusion of the left and right between the films and film and spout of the spout, the use of flat sealing bars,
Is included as a preferred embodiment thereof.

  In the present invention, the spout is crushed by holding the heat-sealed portion between the left and right films of the spout and pressing them in the center direction of the spout. For example, when a spout with a circular cross section is crushed into an elliptical cross section, the major axis side is pressed from the front side to the inside to adjust to a circular shape. In the present invention, since the spout is corrected by applying force from the outside rather than being spread from the inside, for example, even if the spout has a tapered shape, it is possible to correct crushing regardless of its shape.

  If the correction of crushing is performed by heating separately, the temperature for correcting crushing can be reliably obtained.

  If correction of crushing is performed using the residual heat at the time of heat fusion of the spout and the film, the labor of heating for correction can be omitted or the heating time can be shortened. Use of this residual heat is facilitated by keeping at least the heat-sealed portion of the spout and the film after heat-sealing of the spout and the film.

  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 middle of a stage which presses a seal bar from the film which pinched spout, and crushes spout. 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 FIG. 1 of the state which hold | gripped the heat fusion part of the films of right and left of the spout shown by FIG. 4 with the holding tool. FIG. 6 is an enlarged cross-sectional view corresponding to AA of FIG. 1 in a state where the crush of the spout is corrected by pressing the gripper in the center direction from the state of FIG. 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. 2 is an enlarged cross-sectional view taken along the line AA in FIG. 1. FIG. 3 is an enlarged cross-sectional view corresponding to AA in FIG. 1 in the middle of crushing the spout by pressing the seal bar on the film sandwiching the spout. 4 is an enlarged cross-sectional view corresponding to AA in FIG. 1 in a state in which the seal bar is released after the heat fusion by the seal bar is completed, and FIG. 5 is a view between the left and right films of the spout shown in FIG. FIG. 6 is an enlarged cross-sectional view corresponding to A-A in FIG. 1 in a state where the heat-sealed portion is gripped by a gripping tool. FIG. 6 is a diagram illustrating that the spout is crushed by pressing toward the center of the spout from the state of FIG. FIG. 7 is an enlarged cross-sectional view corresponding to AA in FIG. It is a plan view of the container with prepared 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, as shown in FIG. 5, the heat fusion part between the left and right films 2, 2 of the spout 3 is gripped by a pair of left and right grips 6, 6, and the grips 6, 6 Correct the spout 3 crush. As the left and right grips 6, 6, for example, upper and lower block-shaped instruments that can be moved back and forth in the opposite direction (left-right direction in FIG. 5) and sandwich the films 2, 2 can be used.

  As shown in FIG. 6, the correction by the gripping tools 6 and 6 is performed by moving the left and right gripping tools 6 and 6 holding the heat fusion part between the left and right films 2 and 2 of the spout 3 forward in the opposing direction. This is done by pressing the spout 3 toward its center. The spout 3 is pressed in a direction orthogonal to the crushing direction shown in FIG. 3, and the flattened cross-sectional shape is restored to the original cross-sectional shape or a cross-sectional shape close thereto.

  In order to perform the correction with the gripping tools 6 and 6 with certainty, at least the heat-sealed portion of the spout 3 with the films 2 and 2 is not lower than the melting point and higher than the softening point of the synthetic resin constituting the spout 3. The temperature is maintained, preferably 10 ° C. or more above the softening point and below the melting point. The temperature at the time of correction may be obtained by reheating, for example, by blowing hot air after heat fusion by the seal bars 5 and 5 shown in FIG. However, after the heat fusion by the seal bars 5 and 5, if the correction is performed while the temperature is maintained at the residual heat at the time of the heat fusion, it is not necessary to provide a new heating means in the production line. In addition, it is preferable because an extra reheating time becomes unnecessary and the manufacturing time can be shortened. When using the residual heat at the time of heat fusion, after heat fusion, for example, by covering the heat fusion portion of the spout 3 with the films 2 and 2 with a heat insulating sheet, at least with the films 2 and 2 of the spout 3 It is preferable to keep the heat-sealed part warm. This heat retention can suppress a temperature drop during the movement from the heat fusion process to the correction process, and makes it easier to maintain the temperature of the heat fusion part at or above the softening point of the synthetic resin constituting the spout 3. In addition, if the temperature is kept warm, even if the temperature of the heat-sealed portion falls below the softening point of the synthetic resin constituting the spout 3 during the movement from the heat-sealing step to the straightening step, It is possible to shorten the heating time when re-heating.

  The pressing by the gripping tools 6 and 6 is maintained until at least the spout 3 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 gripping tools 6 and 6. This cooling may be performed at room temperature or under cooled air.

  When the gripping by the gripping tools 6 and 6 is released after the cooling, as shown in FIG. 6, the initial spout 3 or the spout 3 in an open state close thereto is obtained.

  A spout-equipped bag as shown in FIG. 7 can be obtained as described above. In FIG. 7, 4 d is a spout attachment edge fusion part, which is a fusion part by the seal bars 5, 5. 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. Further, 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.

  In the above description, the spouts 3 are all cylindrical, but the spout 3 used in the present invention is, for example, a tapered shape with a gradually decreasing diameter, or a shape with a step that changes in diameter at the intermediate portion. It may be.

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 Gripping tool 7 Cap 8 Protrusion part

Claims (5)

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 one edge of the film constituting the front and back of the container body, and the spout is crushed by sandwiching the spout along the one edge of the film from above the film with a seal bar. After heat-sealing each other and the film and the spout, at least the heat-sealed part with the spout film is maintained at a temperature equal to or higher than the softening point of the synthetic resin constituting the spout. A method for manufacturing a bag with a spout, characterized in that the heat-sealed portion is held and pressed in the center direction of the spout and cooled in a state in which the spout is crushed.   At the time of correcting spout crushing, at least the temperature of the heat-sealed part with the spout film is equal to or higher than the softening point of the synthetic resin that constitutes the spout by the left and right films of the spout and the residual heat of the film and the spout. The manufacturing method of the bag with a spout of Claim 1 characterized by the above-mentioned.   Softening of the synthetic resin that constitutes the spout by heating at least the temperature of the heat-sealed part of the spout film with the spout film and the film and the spout after heat-sealing when correcting spout crushing The method for producing a spout-equipped bag according to claim 1, wherein the temperature is equal to or higher than a point.   The method for producing a bag with a spout according to claim 2 or 3, wherein at least a heat-sealed portion with the spout film is kept warm after heat-sealing between the left and right films of the spout and between the film and the spout. And crushing the spout, as a seal bar to perform the heat fusion of the left and right between the films and film and spout of the spout, according to any one of claims 1 to 4, characterized by using a flat seal bars Of manufacturing a bag with a spout.

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