JP3935559B2 - Bag-in-box spout - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a spout for a bag-in-box that is filled with a liquid such as food, industrial chemicals, ink, or mucilage.
[0002]
[Prior art]
A bag-in-box is a packaging form in which a bag made of a relatively flexible film is accommodated in, for example, an outer box made of cardboard, and is mainly used for liquids and mucilages used mainly for business purposes. Is. In many cases, a pouch is bonded to a predetermined position with a pour-out port (hereinafter referred to as a pour-out port) for a molded product intended to pour out the contents. The feature of this bag-in-box is that there is no need for air inflow into the container like a rigid container because the container (bag) is crushed by atmospheric pressure in accordance with the use of the contents and the bag is sealed. . Therefore, during the period from the beginning of use of the contents to the end of use, the contents are prevented from being altered by the atmosphere. In addition to the quality preservation characteristics of the contents, the packaging material after use can be folded, and the outer box (box) and inner bag (bag) can be separated. In addition, the packaging material per unit content is inexpensive.
In the bag of the bag-in-box, there are a case where it is supplied to the filling machine as a bag for each unit and a case where it is supplied to the filling machine as a continuous bag in which each bag is continuously connected. Since it is automatically supplied at the time of filling, there is an advantage that less manpower is required as compared with the supply in a bag for each unit.
[0003]
As an example of the structure of the spout in the bag-in-box, it was composed of a grommet and an inner stopper and a cap, or composed of a grommet and a stopper-type cap.
FIG. 7 is a cross-sectional view of the continuous bag type bag-in box according to the prior art in a state where the grommet and the cap are fitted and an enlarged view of the S ₂ portion. FIG. it is an enlarged view of a cross-sectional view and S ₃ portion in a fitted state of the grommet and cap.
Both the inner stopper h as shown in FIG. 8 and the cap C ′ as shown in FIG. 7 are of the stoppering type, and these inner stoppers or caps were sealed by pressurizing them from above. In this way, the sealing is simply a fitting, and in order to enhance the sealing performance, an elastic inner plug h or cap C ′ having elasticity is often used for the rigidity of the grommet. However, even with such a method, sealing with a stopper is not always sufficient. Therefore, in the case of using the above-described inner plug, in the configuration shown in FIG. 8, there is an example in which the cap C ″ is screwed by a human hand as a separate process after the inner plug h is plugged by a machine. .
Conventionally, a continuous bag type bag-in-box has no screw cap that can be continuously filled and sealed.
In the case of conventional continuous filling, so-called airless filling is performed in which the inner diameter of the grommet inlet and the outer diameter of the filling nozzle are the same, and no air is mixed during filling. However, when the filling nozzle is brought into close contact with the opening of the outlet, the contents may adhere to the opening, and when the cap is tightened while the contents are still attached, If it was a stopper type, there was no problem. However, if a screw type cap was used, the tip of the grommet would become dirty, and a reliable seal could not be obtained. For this reason, there is a case where tightening by hand is performed again.
[0004]
[Problems to be solved by the invention]
In the bag-in-box, when filling, the grommet is securely set at the fixed position of the filling section and is chucked, and the cap is a screw cap type. When the cap is removed, the grommet is prevented from rotating. Therefore, a bag-in-box is provided in which a grommet is fixed and a stable filling operation is possible.
[0005]
[Means for Solving the Problems]
A bag-in-box to which a spout consisting of a combination of a grommet and a cap is attached, the grommet comprising a flange portion bonded to the inner surface of the pouch and a cylinder portion for pouring the contents, A guide rail groove formed by two upper and lower guide plates, and a chucking portion having a parallel surface or an aerial parallel surface that can be set in a fixed direction at least with respect to the flow direction of the bag ; and The upper guide plate is a bag-in-box spout having a circular shape within a range that does not interfere with the grommet being adhered to the bag, and has an unevenness on the outer periphery of the upper guide plate. The following inventions are included. That is, the spout has a structure in which a grommet and a cap are attached by screwing, an inner ring that is in close contact with an inner corner of the opening of the grommet on the inner surface of the top plate of the cap, and an opening of the grommet Forming contact ribs in contact with the top surface of the part; providing the chucking part between the flange part and the lower guide; and providing an annular ring protruding from the inner wall of the cylindrical part.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to a bag-in-box, which enables reliable transport and fixing of a grommet in a predetermined position in the case of a packaging material, for example, a continuous bag, etc. Between each bag made, it has a perforation etc. so that one bag can be separated, and in the fixed position of each bag, reliable conveyance of a bag which is the main subject of the present invention, and a grommet part A spout with a structure that ensures chucking in place is attached. In addition, the grommet has a structure that can be reliably applied to a screw-type cap.
FIG. 1 is a perspective view (a) showing an embodiment of a spout of a bag-in-box according to the present invention, an explanatory view (b) of a spout with a cap removed, and a cross-sectional view of a portion X ₁ -X ₁ (c) FIG. 2 is a front view including a partial cross section showing the structure of the spout grommet according to the present invention, (a), X ₂ -X ₂ cross section, (b), X ₃ -X ₃ cross section (c). , X ₃ -X ₃ sectional view (d) of another shape, FIG. 3 is a front view (a) including a partial cross section showing the structure of the cap of the spout according to the present invention, an enlarged view of S ₁ part ( b) and FIG. 4 are a front view (a) and a top view (b) showing a guiding state by the guide rail groove in the spout of the present invention.
FIG. 5 is a front view (a) showing a state in which the grommet is fixed and the filling nozzle is inserted at the spout of the present invention, and is a perspective view from the X ₄ -X ₄ portion for explanation, and a grommet receiving portion of the filling machine FIG. 6B is a cross-sectional view showing a state when the grommet portion of the present invention is filled. FIG.
[0007]
In the case of the stopper cap C according to the prior art, since the stopper is fitted to the opening of the grommet G by pressurization from above, no special measures for preventing the rotation of the grommet G were required. . However, when a screw cap is used, the grommet G side requires a resistance against the tightening torque or the opening torque.
That is, the grommet G needs to be reliably chucked at a predetermined position in order to keep the rotation prevention state.
Therefore, in the present invention, a chucking portion 8 is formed between the flange 1 of the grommet G and the lower guide plate 5 so that the screw can be reliably screwed even when the screw cap C is attached.
The chucking portion 8 is regulated in at least a fixed direction on the outer wall of the cylindrical portion forming the chucking portion in order to make the shape suitable for the structure of the grommet receiving portion when filling the contents or removing the cap C. An aerial parallel surface p ₀ is formed by the parallel surfaces p or ribs formed.
As shown in FIG. 2, the structure of the grommet G in the present invention includes a flange 1 having an area that can be bonded to the inner surface of the bag B, and a cylinder that forms a liquid conduit portion when the contents are poured out from the center of the flange 1. The cylindrical portion 2 has an opening 3 through which the liquid is poured out, and two guide plates 4 on the upper and lower sides are provided outside the cylindrical portion between the flange 1 and the opening 3. 5 is provided. Further, between the flange 1 and the lower guide plate 5 forms a chucking section 8 comprising a rib forming a parallel plane p or imaginary parallel planes p _0.
Furthermore, an annular ring 13 can be formed on the inner surface of the cylindrical portion 2 as necessary.
[0008]
The two upper and lower guide plates 4 and 5 form a guide rail groove 6 for reliable conveyance when conveying a continuous bag type bag-in-box. The upper guide plate 4 is preferably formed in a circular shape as long as the guide rail groove is formed as deep as possible, but not in the range of ring sealing when the grommet is bonded to the bag. It is desirable to form parallel pieces in order to adjust the position at the time of bag making. For this reason, for example, a hexagonal shape is used as shown in FIG.
Providing the irregularities 10 on the outer periphery of the upper guide has an effect as a slip prevention measure when the grommet G is provided.
[0009]
A parallel surface p is formed on the outer wall of the cylindrical portion between the lower guide 5 and the flange 1. As the shape of the outer wall of the cylindrical portion, a parallel surface can be obtained by making it an even polygon such as a tetragon, hexagon, or octagon. Alternatively, a cylindrical portion having a cross-sectional shape as shown in FIG. 2 (e) is provided, and a vertical rib-like portion 7 is provided between the lower guide 5 and the flange 1, and the two outer circumferences of the vertical rib-like portion 7 are provided. two surfaces of the surface in contact with the surface may be a condition for forming an imaginary parallel surface p _0. The parallel surface p or the aerial parallel surface p ₀ obtained in this way is sandwiched between the grommet receiving portions of the filling machine, and reliable chucking is possible.
[0010]
Depending on the type of contents, an annular ring 13 protruding from the inner wall of the cylindrical portion can be provided. When the contents are filled, the outer diameter of the filling nozzle 32 is in close contact with the inner diameter of the annular ring 13, thereby enabling airless filling in which no air is mixed into the contents at the time of filling. Since it is provided in the interior away from 3, filling is possible without the contents adhering to the opening 3.
However, depending on the type of contents, airless filling that does not contaminate the opening 3 is possible even if the filling nozzle 32 having the annular ring 13 provided on the outer peripheral surface is used.
[0011]
The knurl 10 can be formed on the outer peripheral surface of the upper guide plate 4. By providing the knurl 10, the grommet G does not slip when the grommet G is held in the hand. Become.
[0012]
It is desirable that the planar shape of the lower guide plate 5 has the same parallel as the parallel side of the chucking portion 8. The reason is that the lower guide plate functions effectively when regulating the direction of the grommet G with respect to the bag flow during bag making, and when the chucking portion 8 of the grommet G is fixed in the chucking of the filling machine. By fixing the two sides of 5 together, more reliable fixing is possible. As long as the parallel side of the lower guide plate and the parallel surface of the chucking portion 8 are in a parallel relationship, the parallel interval may not be the same.
[0013]
The bag used for the bag-in-box of the present invention may be stored in a box and supplied in a continuous state. In this case, a flexible film F is used, and a grommet is attached to a film on one side in advance. After opening the hole, after attaching the grommet G, the opposing films are overlapped, and four sides of predetermined dimensions are made by a method such as heat sealing. At this time, the film constituting the bag is generally often made by stacking two or more films. In the present invention, after the bags are made, the bags for each unit are not separated, and are kept continuous, and weak lines (hereinafter referred to as perforations 12) that are easy to separate are provided between the bags.
[0014]
For the film F used for the bag B, the most appropriate material, thickness, and the like are selected according to flexibility, bending strength, barrier properties, and the like in consideration of the type of contents, filling amount, and the like. In particular, when the contents are liquid and the film is bent by vibration for a long time, the film tends to generate pinholes (fine holes) due to bending fatigue. Therefore, the film used under such conditions is selected from a material having tough characteristics. Examples of the resin constituting the film used in the bag-in-box include low-density polyethylene, ethylene-vinyl acetate copolymer, linear low-density polyethylene, ionomer, and ethylene-α / olefin copolymer polymerized using a single-site catalyst. A polymer etc. can be mentioned. Moreover, the single layer of these resin may be sufficient, and the multilayer film by co-extrusion film forming may be sufficient. In the case of a multilayer film, a high barrier resin such as a saponified ethylene-vinyl acetate copolymer or a polyvinyl alcohol resin can be used.
[0015]
The film F constituting the bag B may be a multilayer film laminated by a normal laminating method. In that case, a metal foil such as an aluminum foil, polyester, polyamide, polyvinylidene chloride is used. An unstretched or stretched film made of polypropylene or the like, or a film obtained by depositing a metal such as aluminum, an oxide thereof, or an inorganic oxide such as silicon on these films can also be used.
The film forming the bag of the bag-in-box can be obtained by a general film forming method, for example, a casting method using a T die, an inflation method using a circular die, or the like. The film may be a film having a multilayer structure by coextrusion.
[0016]
The cap in the bag-in-box according to the present invention may be a stoppered cap C, but it is characterized in that it can be stably sealed even if it is crowned by a screw cap.
When the screw cap is used in the present invention, the inner ring 22 and the contact rib 23 are provided on the top plate 20 of the cap C. The inner ring 22 is inscribed in the opening 3 of the grommet when the cap C is tightened, fulfills a first liquid sealing function, and further has a contact rib 23 provided outside the inner ring 22. The contact rib 23 also comes into contact with the top surface of the grommet opening 3 when the cap C is tightened to perform the second liquid sealing function, and realizes a more reliable sealing performance together with the inner ring. It is.
Further, by providing the irregularities 24 on the outer peripheral surface of the cap in the present invention, when the cap C is detached by hand, it is possible to prevent slipping on the outer surface of the cap C and to facilitate the desorption.
[0017]
The grommet G is formed by injection molding of a plastic resin. The resin used for the grommet G is a material that does not affect the quality of the contents when it comes into contact with the contents, and does not deteriorate due to contact with the contents. A resin that can be bonded to the inner surface and has good moldability is selected. The resin used for forming the grommet G is low density polyethylene, medium density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, linear low density polyethylene, ethylene-α / olefin copolymer polymerized using a single site catalyst. Examples thereof include polymers and ionomers.
[0018]
As with the grommet G, the cap C is injection molded using a plastic resin. The resin used for forming the cap C includes low density polyethylene, medium density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, linear low density polyethylene, and ethylene-α / olefin copolymer polymerized using a single site catalyst. In addition to resins used for molding grommets G such as polymers and ionomers, mention may be made of polystyrene, acrylonitrile-styrene-butadiene copolymers, polycarbonate, polyester, and polyamide resins.
As the resin used for molding the cap C and the grommet G, it is desirable to select resins having different hardnesses. That is, it is because there exists an effect which improves adhesiveness by setting it as a combination from which hardness differs in the case of screwing, a fitting, etc.
For example, if the spout has a grommet G of linear low density polyethylene (hereinafter referred to as L-LDPE) and a cap C of polypropylene, adhesion is ensured when the cap C is tightened.
By providing irregularities on the outer surface of the skirt portion of the cap C, the cap C can be easily detached by hand.
[0019]
For example, as a method for producing a continuous bag type bag-in-box, supplied as two-ply example a film forming a bag from a film supply using a dedicated bag making machine (Fig. 1F _1, F _2), in the film Circular punching for grommet mounting. By supplying a molded product of the grommet G from the parts feeder and projecting the cylindrical part 2 outward from the lower part of the punched part, and by thermally bonding the flange 1 of the grommet G and the film inner surface of the peripheral part of the punched part The grommet G is adhered to the film F. Next, two corresponding films are supplied as a stack (F _3, F ₄ ), polymerized into the films (F ₁ , F ₂ ), and heat-sealed 11 on the four sides of the bag, thereby making each bag. Is completed. Each bag is not cut, and a perforation 12 or the like is provided so that the bags can be easily separated.
When the grommet G is supplied to a predetermined position from the parts feeder by using the chucking portion 8, the direction of the grommet G is adjusted to adhere the inner surface of the film and the flange 1 thereof. At that time, the bag B is attached to the bag B in a state where a constant angle is always maintained between the parallel plane p or the aerial parallel plane p ₀ and the bag flow direction.
As a specific angle, the parallel plane p or the aerial parallel plane p ₀ of the chucking portion 8 of the grommet G is set to coincide with the flow direction of the bag B or set in a direction perpendicular to the flow. The filling process and the capping process are facilitated.
[0020]
Since the guide rail groove 6 is formed, when the bag-in-box is supplied to the filling machine, the guide rail 30 installed in the supply unit is put into the guide rail groove 6 and the bag is pulled in the direction of the filling machine. Then, the grommet G is finally chucked on the grommet receiving portion 31 of the filling machine along the guide rail. At this time, since the grommet receiving portion 31 securely holds the parallel surface p or the aerial parallel surface p ₀ of the grommet G, the grommet receiving portion 31 resists the tightening torque or the opening torque required when the cap C is detached. Therefore, the screw cap can be securely attached and detached.
[0021]
When filling the liquid, if the opening 3 and the outer diameter of the nozzle are not in close contact with each other, there is a problem because air is embraced in the content liquid.
In the conventional filling, airless filling is performed by a filling nozzle 32 having substantially the same diameter that is in contact with the inner wall of the grommet G. The contents may adhere to the opening of the.
Therefore, in the present invention, the annular ring 13 is provided on the inner surface of the cylindrical portion of the grommet G, and the filling nozzle 32 is brought into close contact with the annular ring 13 below the opening 3 to fill the opening 3. It was possible to fill the contents without attaching them. In other words, airless filling is possible, and capping is possible in a state where the contents do not adhere to the opening 3. Further, the inner ring 22 is provided on the lower surface of the top plate of the cap C so as to be in close contact with the inner corner of the opening, and the contact ribs 23 that are in contact with the entire circumference of the upper surface of the opening are provided. Sex became more certain.
[0022]
【Example】
The bag was composed of two layers of L-LDPE // L-LDPE, each having a thickness of 60 μm. The size of the unit bag was 450 mm × 450 mm as the inner size of the seal, the filling amount of the contents (sake) was 10 liters / bag, and the box (outer box) to be used was corrugated cardboard of a predetermined size. The inner diameter was 220 mm × 230 mm × 250 mm.
The bag was a series of 30 bags. A perforation 12 is provided between each bag to facilitate separation for each unit bag.
Grommet G was molded by injection molding using L-LDPE as a molding material. Its main dimensions are as follows: flange diameter 75mm, cylinder inner diameter 30mm, cylinder thickness 2mm, upper guide plate 4 circular 47mm in diameter The lower guide plate 5 has a regular hexagonal shape with an interval between opposing sides of 45 mm, and the interval between the upper and lower guide plates is 4 mm. The depth of the formed guide rail groove is 7 mm from the outer periphery of the upper guide plate 4.
The protrusion ring provided on the inner wall of the cylinder part was a 1.5 mm protrusion from the inner wall surface of the cylinder part. At this time, the filling nozzle 32 has an outer diameter of 28 mm at a portion contacting the annular ring 13, and a 45 ° taper is provided between the tip and the base to fill the annular ring 13. The tip of the nozzle 32 is easy to insert.
As a result, it was possible to fill in the airless state without contaminating the opening with the liquid of the contents.
Further, the chucking portion 8 is provided with six vertical ribs on the outer side of the circular cylindrical portion and six corners of the lower guide plate 5, and two parallel sides of an aerial hexagon formed by the six ribs. The parallel part was set parallel to the bag flow direction.
Cap C was molded by an injection molding method using polypropylene resin. The top plate of the cap was provided with an inner ring 22 and a contact rib 23, each of which was inscribed in contact with the opening 3 of the grommet or in contact with the top surface of the opening.
[0023]
The guide rail 30 has a structure in which a metal plate having a thickness of 3 mm is maintained in parallel at intervals of 35 mm, is held at a length of 800 mm, and the tip thereof is in contact with the filling portion chucking portion 8. Further, the guide rail is sandwiched in the guide rail groove 6 of the next grommet G when the grommet G is fixed to the chucking portion 8 and is again ready to transport the bag B.
The filling unit chucking unit 8 opens the chucking arm after the completion of filling and mounting of the cap C, and enables the filled bag to be transported to the next position.
In this way, it is possible to fill successive bag-in-boxes one after another, and each unit bag is separated by a perforation 12 provided between the bags above the position to be stored in the outer box.
[0024]
【The invention's effect】
By inserting the guide rail of the filling system into the guide rail groove formed by the two guide plates 4 and 5 provided in the grommet G, the bag can be stably and automatically conveyed. When the bag-in-box is continuously made (each piece is joined at the perforation), the direction of the grommet G position can always be fixed to the flow direction of the bag. When attaching and detaching, it is possible to always fix in a fixed direction, and it is possible to provide resistance against the tightening torque or opening torque applied to the attachment and detachment of the cap C.
Since the filling nozzle 32 can be brought into close contact with the annular ring 13 provided inside the cylindrical portion 2 of the grommet, airless filling is possible and capping is possible without adhering the contents to the opening 3.
[Brief description of the drawings]
FIG. 1 is a perspective view (a) showing an embodiment of a spout of a bag-in-box according to the present invention, an explanatory view (b) of a spout with a cap removed, and a cross-sectional view of a portion X ₁ -X ₁ (c) )
FIG. 2 is a front view including a partial cross section showing the structure of a spout grommet according to the present invention, (a), X ₂ -X ₂ cross section, (b), X ₃ -X ₃ cross section (c), X Sectional view of another shape of ₃ -X ₃ (d)
Front view in partial cross-section of the structure of a cap of the spout according to the present invention; FIG (a), S ₁ part enlarged view (b)
FIG. 4 is a front view (a) and a top view (b) showing a guide state by a guide rail groove at the spout of the present invention.
FIG. 5A is a front view showing a state in which a grommet is fixed and a filling nozzle is inserted at a spout according to the present invention, and a perspective view from the X ₄ -X ₄ portion for explanation, and a grommet receiving portion of a filling machine (B) showing the grommet chucking part separated from the grommet
6 is a cross-sectional view showing a state when the grommet portion of the present invention is filled. FIG. 7 is a cross-sectional view of a spout of a bag-in-box according to the prior art (a) and an enlarged view of S ₂ (b).
FIG. 8 is a cross-sectional view of another spout of a bag-in-box according to the prior art (a) and an enlarged view of S ₃ (b)
[Explanation of symbols]
B Bag G Grommet C Cap F Film p Parallel surface h Inner plug 1 Flange 2 Cylindrical portion 3 Opening portion 4 Upper guide plate 5 Lower guide plate 6 Guide rail groove 7 Vertical rib 8 Chucking portion 9 Screw 10 Upper guide plate Concavities and convexities provided on the side surface 11 Bag seal portion 12 Perforation 13 Annular ring 20 Top plate 21 Skirt portion 22 Inner ring 23 Contact rib 24 Cap unevenness 25 Cap screw 30 Guide rail 31 Grommet receiving portion 32 Filling nozzle

Claims (3)

A spout for a bag-in-box consisting of a combination of a grommet and a screw cap,
The grommet includes: the flange portion is bonded to the inner surface of the bag and the contents were a tip portion of the cylindrical portion and the cylindrical portion for forming a liquid conduit portion for pouring inlet opening liquid to the note and out And on the outer side of the cylindrical part between the flange part and the opening part, two upper and lower guide plates comprising an upper guide plate and a lower guide plate are provided,
Furthermore, a guide rail groove for conveying a continuous bag type bag-in-box is formed between the two upper and lower guide plates ,
In addition, a chucking portion having a parallel surface or an aerial parallel surface that can be set in a fixed direction at least with respect to the flow direction of the bag is provided outside the tube portion between the flange portion and the lower guide plate. And
The bag-in-box is characterized in that the upper guide plate has a circular shape within a range that does not interfere with bonding of the grommet to the bag, and is provided with irregularities on the outer periphery of the upper guide plate. Spout. The spout has a structure in which a grommet and a screw cap are attached by screwing, and the screw cap includes a top plate and a skirt portion suspended from the periphery thereof, and an opening of the grommet is formed on a lower surface of the top plate. 2. The bag-in-box spout according to claim 1, wherein an inner ring that is in close contact with an inner corner of the part and a contact rib that is in contact with the top surface of the opening of the grommet are formed. The spout of claim 1 to claim 2, wherein the bag-in-box, characterized in that an annular ring is protruding into the cylindrical inner wall.

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