JP5345279B2 - Outlet seal structure for bag-in-box and bag-in-box including the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a liquid leak and to easily adjust an angle of the spouting direction of a spout tap member, in a bag-in-box which has the spout tap member at a cylindrical part of a spout member. <P>SOLUTION: The inside peripheral face 15 of the cylindrical part 11 of a spout member 10 is formed of a stage 16 with a face facing the base end 13 of the part 11. A draw-out preventive protrusion 25 which touches with and fits to the part 11 in the axis direction relative to the part 16 is formed at the tip of the insertion mounting part 21 of a spout lap member 20. The protrusion 25 is stored in a part between the stage 16 and the base end 13 side in the cylindrical part 11 without protruding out of the part 11. The outer peripheral face 24 of the mounting part 21 is formed at least with two chevron cross sectioned annular protrusive strips 26 extensively formed in the peripheral direction of the face 24. The inside peripheral face 15 of the part 11 contacts only with the outer peripheral end 27 of the strip 26 between the part 16 and the tip 12 of the part 11. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to a bag-in-box spout seal structure and a bag-in-box including the same.

  In recent years, a packaging bag using a plastic film is stored inside a paper outer box, and is mainly used for liquid filling (a so-called bag-in-box packaging container, This term is used widely for business and home use.

Conventionally, glass bottles and metal can containers have been used as packaging containers for filling liquids because they do not allow permeation of gas and can prevent oxidation and are suitable for long-term storage of contents. However, glass bottles have the inconvenience that they cannot be used for containers with large internal volumes due to the dangers of breakage during transportation and use, and the difficulty of handling when disposing of them. It was.
In addition, a metal can container can be used for a container having a large internal volume because there is no risk of breakage, and it has been used for a long time as a so-called Ito can (can container having an internal volume of 18 liters). However, there is a problem in that it is inconvenient to transport a bulky empty container for disposal.

On the other hand, the bag-in-box compensates for the weakness and irregular shape, which are disadvantages of packaging bags made of plastic film, by using a paper outer box, and after consuming the contents, the outer box and the inner It has an excellent function of reducing the volume by folding the bag.
Also, this bag-in-box does not use a composite material made by laminating a plastic film on the inner surface of a paper container, unlike a milk pack container, and completely separates the paper outer box from the plastic film packaging bag. Therefore, it is also excellent from the viewpoint of environmental measures such as separating and collecting resources.
In recent years, bag-in-boxes are becoming more widespread due to such advantages.

  The bag-in-box is mainly composed of a paper outer box, an inner bag made of plastic film, a spout member for discharging contents from the inner bag, and a spout attached to the tubular portion of the spout member. It is comprised from the stopper member. In a bag-in-box, the inner bag is stored in the outer box, and in the case of liquid storage, there is almost no gas space inside the inner bag, and the internal pressure is almost equal to atmospheric pressure. Liquid is stored. A notch is provided on the lower side of the outer box, and the discharge plug member can be pulled out from the notch of the outer box in order to discharge the contents filled in the inner bag.

  Usually, in a state where the bag-in-box is left standing, the pressure applied to the inside of the spout member and the spout plug member is only the head pressure of the stored liquid, and the density of the stored liquid is close to water. If it is a density, it is a very low pressure of 40 cm to 80 cm. In addition, in order to evaluate whether the bag-in-box is adequately protected against vibration, drop impact, and compression received during transportation and transportation, JIS Z 0202 defines a drop test method for packaged cargo. In view of handling conditions, it is required that liquid leakage does not occur due to breakage of the inner bag of the bag-in-box or removal of the pouring stopper even when the bag is dropped freely from about 1 m in height.

Thus, since the pressure applied to the inside of the bag-in-box including the impact load at the time of dropping is relatively small, it has been conventionally used when the spout plug member is inserted and attached to the spout member. A very simple method is used as a spout sealing method for preventing leakage of the liquid in the contents.
Patent Document 1 relates to a technique related to a lid of a stopper cock (pour-out stopper) that is attached to a bag-in-box. However, as a mounting portion of the spout stopper, only a simple cylindrical shape for insertion into a spout member Is disclosed. When the attachment part 21 of the pouring stopper member 20 of Patent Document 1 is inserted into the tubular part 11 of the spout member 10, it is as shown in FIG. 4.
In Patent Document 2, as shown in FIG. 5, a protrusion 29 having a substantially rectangular cross section is provided on the outer peripheral surface 24 of the mounting portion 21 of the cylindrical pouring plug member 20 to prevent the pouring plug from coming off. And the groove | channel 19 which the said protrusion 29 fits is provided in the internal peripheral surface 15 of the cylindrical part 11 of the spout member 10, and the attachment part of the spout stopper once inserted is the structure which cannot be extracted easily. A method for inserting and attaching a spout stopper into a tubular portion of a spout and a spout seal structure are disclosed.
In Patent Document 3, as shown in FIG. 6, two rows of protrusions 29, 29 are provided on the outer surface of the intermediate portion of the attachment portion 21, both for preventing liquid leakage and for preventing the spout from coming off. Two rows of grooves 19 and 19 into which the two rows of protrusions 29 and 29 are fitted are provided on the inner peripheral surface 15 of the cylindrical portion 11 of the member 10, and the mounting portion of the spout plug once inserted is simple. Discloses a method and a spout sealing structure in which a spout is inserted and attached to the tubular portion of the spout.
Patent Document 4 discloses a method for attaching a spout tap that is structured to be tightened with a cap nut.
Japanese Patent Laid-Open No. 11-240569 US Pat. No. 6,131,767 JP-A-8-282793 JP 2000-2111659 A

In the spout plug attachment method and spout seal structure disclosed in Patent Documents 1 to 3, the inner peripheral surface of the tubular portion of the spout member and the cylindrical shape of the spout member mounting portion are formed. The entire outer peripheral surface is in close contact with each other, thereby exhibiting a sealing effect for preventing liquid leakage and preventing leakage of the liquid content.
For this reason, the contact area between the inner peripheral surface of the cylindrical portion of the spout member and the cylindrical outer peripheral surface of the mounting portion of the spout plug is large. Even if it was attempted to adjust the inclination of the mounting angle of the operation handle by rotating the mounting portion of the tap, the contact friction force was too great and it was difficult to rotate it manually.
Therefore, when a general user or consumer uses the contents of the bag-in-box and pulls out the spout from the cutout portion of the outer box, the angle of the operation handle of the spout is inclined. Even if it is confirmed that there is a problem, the angle of the operation handle cannot be adjusted and corrected.

In addition, if it is the attachment method of the pouring stopper which was disclosed by patent document 4 and was tightened with the cap nut, after loosening the cap nut, the main part of the pouring tap will be grasped by hand and the pouring tap It is possible to adjust the inclination of the mounting angle of the operation handle by rotating the mounting portion.
However, in the structure that tightens with a cap nut, there is a risk that the cap nut will loosen and fall off due to vibration during transportation, so in the filling factory that fills the contents in the bag in box, it was configured to tighten with this cap nut. The product cannot be shipped with a spigot attached. For this reason, the transport stage from the filling factory to the consumer has a structure in which a cap nut for the blind lid is attached, and the general consumer himself tightens the cap nut at the time when the contents start to be used. It was inconvenient because it was necessary to attach another spout tap, and it took extra time and cost.

  The present invention has been made in view of the above circumstances, and in a bag-in-box in which a spout member is attached to a tubular portion of a spout member, while preventing liquid leakage, the spout direction of the spout member It is an object of the present invention to provide a spout sealing structure that can easily adjust the inclination of the angle, and a bag-in-box having the spout sealing structure.

In order to solve the above problems, the present invention comprises a spout member fixed to an interior bag of a bag-in-box, and a spout member attached to the spout member, wherein the spout member is an interior bag. And the pouring plug member is disposed on one side of the top surface portion and the top surface portion that closes the tip of the cylindrical portion, An insertion mounting portion to be inserted into the cylindrical portion, and an operating handle of the opening / closing means that communicates with the introduction pipe portion disposed on the other side of the top surface portion, on the inner peripheral surface of the cylindrical portion Is formed with a stepped portion having a surface facing the base end side of the cylindrical portion, and the distal end portion of the insertion mounting portion is in contact with and engaged with the stepped portion in the axial direction. A protrusion is formed, and the protrusion does not protrude outside the cylindrical part and is closer to the base end side than the stepped part in the cylindrical part. Is accommodated in minutes, the watch on the outer peripheral surface of the insertion mounting portion decene member, an annular projection is cross-sectional shape extending in a circular circumferential direction of and the outer circumferential surface in Yamagata is at least two arrangement, The inner peripheral surface of the tubular portion of the spout member is a cylindrical inner surface of the same diameter between the tip of the tubular portion and the stepped portion, and for any protrusion of the insertion mounting portion , Provided is a bag-in-box spout seal structure that is in contact only with an outer peripheral end of a ridge.
The spout member is made of linear low-density polyethylene or low-density polyethylene as a base resin, and includes at least one lubricant selected from the group consisting of higher fatty acid amides, aliphatic hydrocarbons, higher fatty acids, and fatty acid esters. It is preferably formed by injection molding of a mixed resin composition.
The spout member may be configured such that erucic acid amide is mixed at a ratio of 0.02 to 1.5% by weight as the lubricant.

The present invention also provides a bag-in-box having the bag-in-box spout seal structure described above.
The bag-in-box can be used by filling a beverage or a liquid seasoning.

  According to the spout seal structure of the present invention, the insertion mounting portion of the spout member is inserted and attached to the tubular portion of the spout member, and the outer peripheral surface of the insertion mounting portion is formed from a projection having a mountain shape in cross section. The inner peripheral surface of the cylindrical portion of the spout member is a stepped portion that engages with the tip of the cylindrical portion and the protrusion for preventing pulling out of the tip of the insertion mounting portion. The contact area between the inner peripheral surface of the tubular portion of the spout member and the outer peripheral surface of the insertion mounting portion of the spout plug member is conventionally in contact with the outer peripheral end portion of the protrusion. Compared to the technology spout seal structure, it is greatly reduced. Therefore, even if the pressure (load) per unit area applied to the contact portion is the same, the frictional resistance force (rotational torque) on the entire contact surface is greatly reduced. As a result, it is easy to adjust the inclination of the attachment angle of the extraction plug member by rotating the insertion attachment portion of the extraction plug member by grasping and turning the main body portion of the extraction plug member by hand.

  In addition, the base resin of the spout member is made of linear low-density polyethylene (LLDPE) or low-density polyethylene (LDPE) that is flexible and has excellent adhesion and sealing properties, and is a resin mixed with a lubricant. Since the injection molding is performed using the composition, the sealing property of the liquid contents is increased, and the attachment portion of the spout can be rotated more smoothly by grasping the main portion of the spout by the hand. It becomes easy to adjust the inclination of the attachment angle of the spout.

  In the spout seal structure of the present invention, erucic acid amide is mixed in the proportion of 0.02 to 1.5% by weight as the lubricant added to the spout member, so that moderate lubricity is obtained and the beverage And can be used to fill food liquids such as liquid seasonings.

The present invention will be described below with reference to the drawings based on the best mode.
As shown in FIGS. 1 and 2, the spout seal structure 1 according to the present embodiment includes a spout member 10 fixed to the interior bag 2 of the bag-in-box 5 and a spout attached to the spout member 10. A plug member 20 is provided, and an insertion mounting portion 21 of the spout plug member 20 is attached to the cylindrical portion 11 of the spout member 10.

  In the spout seal structure 1 of the present embodiment, the tubular portion 11 of the spout member 10 is open to the interior of the interior bag 2. When the insertion mounting portion 21 is inserted into the tubular portion 11 and the spout member 20 is attached to the spout member 10, the distal end 12 side of the tubular portion 11 faces the top surface portion 22 of the spout member 20. It is blocked by. The top surface portion 22 is provided with an introduction pipe portion 23 that leads to opening / closing means such as an operation handle and a cock (the specific internal structure is not shown). By attaching the spout member 20 in this way, the contents filled in the interior bag 2 can be taken out or the spout member 10 can be closed according to the opening / closing operation of the spout member 20. it can.

  The spout member 10 has a flange portion 14 for heat bonding on the base end 13 side of the cylindrical portion 11, and the spout member 14 is thermally bonded to the film constituting the inner bag 2. 10 is fixed to the interior bag 2. The heat bonding of the spout member 10 via the heat bonding flange 14 is performed using the required heat seal pressure, temperature, and time so that the liquid of the contents does not leak from the inner bag 2.

  As shown in FIG. 3, in the bag-in-box 5 to which the spout seal structure 1 of the present embodiment is applied, the inner bag 2 is housed inside the outer box 3 and a part of the outer box 3 is cut away. . The spout member 10 to which the spout member 20 is attached is drawn out of the outer box 3 through the cutout portion 4 of the outer box 3. A guide plate 17 of the outer box 3 is provided on the outer peripheral surface of the tubular portion 11 of the spout member 10, and the periphery of the notch portion 4 of the outer box 3 is fitted into a groove formed by the guide plate 17. As a result, the wobbling of the spout is prevented. A reinforcing rib 18 is provided on the outer peripheral surface of the tubular portion 11 of the spout member 10.

  The inner peripheral surface 15 of the tubular portion 11 of the spout member 10 has an inner diameter of the portion 15a on the distal end 12 side of the tubular portion 11 that is smaller than an inner diameter of the portion 15b on the proximal end 13 side. Is formed with a stepped portion 16 having a surface facing the proximal end 13 side of the cylindrical portion 11. Further, at the distal end portion of the insertion mounting portion 21 of the spout plug member 20, a pull-out preventing member that comes into contact with and engages the stepped portion 16 in the tubular portion 11 in the central axis direction of the tubular portion 11. A protrusion 25 is formed. That is, when the insertion mounting portion 21 of the spout stopper member 20 is inserted into the tubular portion 11 of the spout member 10, the pull-out preventing projection 25 is engaged with the stepped portion 16 in the tubular portion 11. . As a result, even if a force is applied in the direction opposite to the direction in which the insertion mounting portion 21 is inserted (rightward in FIG. 1), the insertion mounting portion 21 cannot be pulled out from the cylindrical portion 11, thereby preventing pulling out. .

  As shown in FIG. 1, the spout seal structure 1 of this embodiment is configured by engaging a protrusion portion 25 for preventing pull-out with a step portion 16 provided on the inner peripheral surface 15 of the tubular portion 11. A pull-out prevention mechanism is provided, so that in the unlikely event that the bag-in-box 5 is accidentally dropped during transportation, the spout stopper resists the impact load or the internal pressure of the interior bag 2 The state where the member 20 is attached to the spout member 10 can be maintained. Therefore, it is prevented that the spout stopper member 20 jumps out from the cylindrical part 11 of the spout member 10 to cause liquid leakage.

  The protrusion portion 25 for preventing pull-out does not protrude outward from the base end 13 of the cylindrical portion 11, and is a step 15 b on the base end 13 side of the step portion 16 in the cylindrical portion 11, that is, the step of the cylindrical portion 11. It is housed in a portion between the portion 16 and the base end 13. In the spout seal structure 1 of the present embodiment, the position of the spout member 10 is held by the cutout portion 4 of the outer box 3, and the spout member 10 is located at the lower part of the interior bag 2. Even when the amount is small, sticking between the inner surfaces of the interior bag 2 near the spout member 10 is prevented by the load of the contents. And since the protrusion part 25 for pull-out prevention which is also the front-end | tip part of the insertion attachment part 21 of the extraction plug member 20 does not protrude outside from the base end 13 of the cylindrical part 11, the spout of the interior bag 2 is possible. It is possible to prevent a situation in which the inner surface of the portion opposite to the portion to which the member 10 is fixed sticks to the tip end portion of the protruding portion 25 to block the tubular portion 11 and cannot be taken out. Thereby, a flow path for taking out from the interior of the interior bag 2 through the tubular portion 11 is secured.

  And in the spout seal structure 1 of this embodiment, the outer peripheral surface 24 of the insertion mounting portion 21 of the spout member 20 has an annular ridge that has a cross-sectional shape and extends in the circumferential direction of the outer peripheral surface 24. At least two 26 are arranged. The inner peripheral surface 15 of the tubular portion 11 of the spout member 10 is only the outer peripheral end portion 27 of the protrusion 26 of the insertion mounting portion 21 at a portion 15 a between the tip 12 of the tubular portion 11 and the step portion 16. In contact. For this reason, the contact area between the inner peripheral surface 15 of the cylindrical portion 11 of the spout member 10 and the outer peripheral surface 24 of the insertion mounting portion 21 of the spout plug member 20 is compared with that of the conventional spout seal structure. The frictional resistance (rotational torque) between the inner peripheral surface 15 and the outer peripheral surface 24 is greatly reduced. As a result, it becomes easy to adjust the inclination of the attachment angle of the spout by rotating the spout member 20 around the central axis of the cylindrical portion 11 of the spout member 10.

  The spout member 10 is molded integrally using an injection molding machine. When linear low density polyethylene (LLDPE) or low density polyethylene (LDPE) is used as a base resin for injection molding, these base resins are preferable because they are flexible and have excellent adhesion and sealing properties. .

  In addition, an injection molding of a resin composition obtained by mixing the base resin with one or more lubricants selected from the group consisting of higher fatty acid amides, aliphatic hydrocarbons, higher fatty acids, and fatty acid esters is performed. Thereby, the sealing performance of the liquid contents is increased, and the frictional resistance between the inner peripheral surface 15 of the tubular portion 11 of the spout member 10 and the outer peripheral surface 24 of the insertion mounting portion 21 of the spout plug member 20 is further reduced. be able to. Accordingly, the frictional resistance force (rotational torque) between the inner peripheral surface 15 and the outer peripheral surface 24 when the insertion attachment portion 21 is rotated by grasping the main body portion of the spout member 20 by hand can be reduced.

  As the lubricant, higher fatty acid amides, aliphatic hydrocarbons, higher fatty acids, fatty acid esters and the like can be used. One type of lubricant may be used, or a plurality of types may be used in combination. Of these, higher fatty acid amides having excellent effects as lubricants are preferably used. Examples of the higher fatty acid amide include unsaturated fatty acid amides such as oleic acid amide and erucic acid amide, and saturated fatty acid amides such as stearic acid amide and behenic acid amide. As a particularly preferred embodiment, in the spout seal structure 1 of this embodiment, erucic acid amide is mixed at a ratio of 0.02 to 1.5% by weight as the lubricant added to the spout member 10. In this case, moderate lubricity is obtained, and it can be used to fill food liquids such as beverages and liquid seasonings.

  When bag-in-box is used for filling liquids for foods such as beverages and liquid seasonings, the lubricant is heat resistant and the coefficient of friction is stable over time because the components used are heat sterilized. It needs to be excellent. Of the higher fatty acid amides, erucic acid amide is preferred because of its excellent heat resistance and stability over time of friction coefficient.

  Note that the inner peripheral surface 15 of the tubular portion 11 of the spout member 10 and the outer peripheral end 27 of the circumferential protrusion 26 disposed on the outer peripheral surface 24 of the insertion mounting portion 21 of the spout plug member 20; The frictional resistance force (rotational torque) of the cylindrical portion 11 of the spout member 10 (specifically, the tip 12 of the cylindrical portion 11 and the stepped portion 16 with which the outer peripheral end 27 of the ridge 26 is contacted) And the outer diameter of the outer peripheral surface 24 of the insertion mounting portion 21 of the spout member 20 before being inserted into the cylindrical portion 11 of the spout member 10.

  Therefore, the mixing ratio of the lubricant to be mixed into the resin composition used for molding the spout member 10 is appropriately selected and determined according to the required friction coefficient. It is preferable to mix at a ratio of 02 to 1.5% by weight. In particular, it is particularly preferable to mix erucic acid amide as a lubricant in a ratio of 0.04 to 0.8% by weight to the resin composition for molding the spout member 10. This is because if the mixing ratio of erucic acid amide is 0.02% by weight or less, the effect of lubrication is small, and if it is 1.5% by weight or more, lubrication is excessive.

  The bag-in-box 5 of the present invention includes the above-described spout seal structure 1. The exterior box 3 of the bag-in-box 5 and the interior bag 2 stored inside the exterior box 3 are completely separated. The interior bag 2 before being filled with the liquid of the contents can be stored in a folded state inside a three-dimensional exterior box 3 such as a cube or a rectangular parallelepiped. Further, after the interior bag 2 is filled with the contents, it can be stored in the exterior box 3.

Although the manufacturing method of the filling package using this bag-in-box 5 is not specifically limited, For example, the method shown next is mentioned.
For example, after filling the interior bag 2 to which the spout member 10 is fixed, the spout member 20 may be attached to the spout member 10 and further stored in the outer box 3. Also, a cap or the like that temporarily closes the cylindrical portion 11 of the spout member 10 is prepared, and the inner bag 2 is stored in the outer box 3 with the cap or the like attached to the spout member 10, and the outer box By exposing the spout member 10 from the cutout portion 4 provided in 3, the interior bag 2 has assembled an empty bag-in-box 5, and the cap is removed to fill the contents from the spout member 10. Thereafter, a method may be used in which the spout member 20 is attached to the spout member 10 and closed. Moreover, depending on the case, the liquid of the contents can be filled from a filling port (not shown) provided separately from the spout, and the filling port can be closed after filling.

  In the bag-in-box 5 filled with the contents in the inner bag 2 and housed in the outer box 3, the inner bag 2 inflates along the shape of the outer box 3 due to the load of the contents, and the outer box 3 The inner surface of the inner bag and the outer surface of the interior bag 2 are in contact with each other. In this situation, it is impossible to change the shape of the interior bag 2 by shifting the position of the interior bag 2 from the outside of the exterior box 3. For this reason, even if it confirms that the angle of the pouring stopper member 20 pulled out from the notch portion of the outer packaging 3 is inclined, the position of the inner bag 2 is shifted and attached to the outlet member 10 of the inner bag 2. It is not possible to adjust the inclination of the angle of the pouring stopper member 20.

  In the case of the bag-in-box 5, the phenomenon that the angle of the spout member 20 deviates from an appropriate situation is that the interior bag 2 housed inside the exterior box 3 is completely separated from the exterior box 3. It can be said that this is a phenomenon that can occur accidentally. However, in order to adjust the angle of the pouring stopper member 20, taking out the interior bag 2 filled with the contents from the exterior box 3 and re-accommodating it causes the weight of the contents and the shape of the interior bag 2 to be indefinite. Therefore, a great deal of labor is required. For this reason, it is required to adjust the inclination of the mounting angle of the spout plug member 20 by grasping the spout plug member 20 by hand and rotating the insertion mounting portion 21 of the spout plug member 20.

However, in the conventional spout seal structure, the inner peripheral surface 15 of the tubular portion 11 of the spout member 10 and the entire outer peripheral surface 24 of the insertion mounting portion 21 of the spout plug member 20 are in close contact with each other. It exhibits a sealing effect and prevents leakage of the liquid content.
For this reason, if the contact area of the inner peripheral surface 15 of the cylindrical portion 11 of the spout member 10 and the outer peripheral surface 24 of the insertion mounting portion 21 of the spout plug member 20 is large, the main body portion of the spout plug member 20 is When the insertion mounting portion 21 of the spout plug member 20 is rotated by grasping by hand, the contact frictional force is too large to rotate, and the inclination of the spout plug member 20 can be adjusted. There wasn't.

  According to the spout seal structure 1 of this embodiment, the outer peripheral surface 24 of the insertion mounting portion 21 of the spout plug member 20 has at least two protrusions 26 each having a cross-sectional shape of a chevron, The inner peripheral surface 15 of the tubular portion 11 of the outlet member 10 is between the tip 12 of the tubular portion 11 and the stepped portion 16 with which the protrusion 25 for pulling prevention at the tip of the insertion mounting portion 21 is engaged. Only the outer peripheral end 27 of the protrusion 26 is in contact. For this reason, the contact area between the inner peripheral surface 15 of the tubular portion 11 of the spout member 10 and the outer peripheral surface 24 of the insertion mounting portion 21 of the spout plug member 20 is very narrow.

  Therefore, even if the pressure (load) per unit area applied to the contact portion is the same, the frictional resistance force (rotational torque) on the entire contact surface is greatly reduced. As a result, it is possible to adjust the inclination of the mounting angle of the spout plug member 20 by rotating the insertion mounting portion 21 of the spout plug member 20 by manually grasping and turning the main body portion of the spout plug member 20. It becomes easy.

As mentioned above, although this invention has been demonstrated based on suitable embodiment, this invention is not limited to the above-mentioned example, Various modifications are possible in the range which does not deviate from the summary of this invention.
For example, the outer peripheral surface 24 of the insertion mounting portion 21 of the spout plug member 20 is formed with at least two protrusions 26 each having a chevron-shaped cross section. May be semi-circular, semi-elliptical, triangular, trapezoidal or the like.

  Moreover, in this invention, the level | step-difference part 16 is provided in a part of inner peripheral surface 15 of the cylindrical part 11 of the spout member 10, and in the example of embodiment shown in FIG. The side portion 15b has a cylindrical inner surface with the same diameter, but may instead be a conical (tapered) inner surface. Further, the stepped portion 16 is a part of a circumferential groove into which the protrusion portion 25 for preventing pull-out is inserted, and the circumferential groove into which the protrusion portion 25 of the inner peripheral surface 15 of the tubular portion 11 is inserted. The portion closer to the base end 13 may have the same inner diameter as that of the portion 15 a on the distal end side of the step portion 16 of the cylindrical portion 11. In this case, the circumferential groove can be formed by a method such as cutting the inner peripheral surface 15 of the cylindrical portion 11 with a tool.

  INDUSTRIAL APPLICABILITY The present invention can be used as a spout sealing structure of a bag-in-box in which a spout stopper member is mounted on a tubular portion of a spout member, for example, liquid contents (for example, beverages, liquid seasonings, etc. ) Can be suitably used for a bag-in-box filled with.

It is sectional drawing which shows one example of a spout seal structure of this invention. It is sectional drawing which shows the spout member and spout stopper member of the spout seal structure of this invention. It is a perspective view which shows an example of a bag in box. It is sectional drawing which shows the example of the spout sealing structure disclosed by patent document 1. FIG. It is sectional drawing which shows the example of the spout sealing structure disclosed by patent document 2. FIG. It is sectional drawing which shows the example of the spout sealing structure disclosed by patent document 3. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Spout seal structure, 2 ... Interior bag, 3 ... Exterior box, 4 ... Notch part, 5 ... Bag-in-box, 10 ... Spout member, 11 ... Cylindrical part, 12 ... Tip of cylindrical part, 13 ... Base end of cylindrical part, 14 ... Flange part, 15 ... Inner peripheral surface, 16 ... Stepped part, 17 ... Guide plate, 18 ... Reinforcement rib, 20 ... Dispensing plug member, 21 ... Insertion attachment part, 22 ... Top Surface part, 23 ... introducing pipe part, 24 ... outer peripheral surface, 25 ... projection for preventing pulling out, 26 ... projection, 27 ... outer peripheral end of the projection

Claims (5)

A spout member fixed to the interior bag of the bag-in-box, and a spout member attached to the spout member,
The spout member has a cylindrical portion that opens to the interior of the interior bag, and the spout plug member is disposed on the top surface portion that closes the tip of the tubular portion, and on one side of the top surface portion. it is set, has a insertion mounting portion to be inserted into the tubular portion, and an operating handle for opening and closing means leading from inlet pipe portion consisting disposed on the other side of the top surface portion,
A stepped portion having a surface facing the proximal end of the tubular portion is formed on the inner peripheral surface of the tubular portion, and the distal end portion of the insertion mounting portion is axially contacted with the stepped portion. A pull-out preventing protrusion that contacts and engages is formed, and the protrusion is housed in a portion closer to the proximal end than the stepped portion in the tubular portion without protruding outside the tubular portion,
The watch on the outer peripheral surface of the insertion mounting portion decene member, an annular projection is cross-sectional shape extending in a circular circumferential direction of and the outer circumferential surface in Yamagata is at least two arranged, tubular said spout member The inner peripheral surface of the portion is a cylindrical inner surface of the same diameter between the tip of the cylindrical portion and the stepped portion, and the outer peripheral end portion of the ridge with respect to any ridge of the insertion mounting portion. Outlet seal structure for bag-in-box, characterized in that only the contact.   The spout member is made of linear low-density polyethylene or low-density polyethylene as a base resin, and includes at least one lubricant selected from the group consisting of higher fatty acid amides, aliphatic hydrocarbons, higher fatty acids, and fatty acid esters. 2. The bag-in-box spout seal structure according to claim 1, wherein the structure is formed by injection molding of a mixed resin composition.   The spout sealing structure for a bag-in-box according to claim 2, wherein the spout member is mixed with erucamide as a lubricant at a ratio of 0.02 to 1.5% by weight.   It has the spout seal structure for bag-in-boxes as described in any one of Claims 1-3, The bag-in-box characterized by the above-mentioned.   The bag-in-box according to claim 4, wherein the bag-in-box is used by being filled with a beverage or a liquid seasoning.

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