JP6882661B2 - Laminate peeling container - Google Patents

Description

The present invention relates to a laminated stripping container.

Conventionally, a container body having an outer shell and an inner bag and the inner bag peeling off from the outer shell and shrinking as the contents decrease, and an intermediate space between the outer shell and the inner bag and an outer space of the container body. Laminated stripping containers are known that include a check valve that regulates the inflow and outflow of air between them (for example, Patent Documents 1 and 2).
In Patent Document 1, a valve is built in a cap attached to the mouth of the container body.
In Patent Document 2, a valve is provided inside the body of the outer shell.

Japanese Unexamined Patent Publication No. 2013-35557 Japanese Unexamined Patent Publication No. 4-267727

In the configuration of Patent Document 1, the structure of the cap becomes complicated, which leads to an increase in production cost. The configuration of Patent Document 2 requires a troublesome process of adhering a check valve to the inside of the body of the outer shell, which leads to an increase in production cost.

The present invention has been made in view of such circumstances, and provides a method for manufacturing a laminated stripping container having excellent productivity.

According to the present invention, a container body forming step of forming a container body having an outer shell and an inner bag, and an outside air introduction hole penetrating only the outer shell are formed in a storage portion of the container body for accommodating the contents. A step of forming an outside air introduction hole, a pressing step of pressing the edge of the outside air introduction hole on the inner bag side, and a valve member mounting step of mounting a valve member capable of opening and closing the outside air introduction hole on the outer shell are provided. , A method for manufacturing a laminated peeling container is provided.

As a result of diligent studies, the present inventor has formed an outside air introduction hole in the outer shell so that the valve member can be attached to the outer shell by pushing the valve member into the outside air introduction hole of the outer shell from the outside of the outer shell. did. According to such a configuration, it is not necessary to provide a check valve on the cap, and the valve member can be easily attached, so that the structure is simple and the productivity is high.

Further, as a result of further detailed examination, it was found that when the outside air introduction hole is formed in the outer shell, burrs may be generated in the outside air introduction hole and may interfere with the valve member.

When countermeasures against such problems were examined, a pressing step of pressing the edge of the outside air introduction hole on the inner bag side toward the outside in the radial direction of the outside air introduction hole was performed before the valve member mounting step. , It has been found that it is possible to prevent the burr from inclining outward with respect to the outside air introduction hole and interfering with the valve member, and the present invention has been completed.

Hereinafter, various embodiments of the present invention will be illustrated. The embodiments shown below can be combined with each other.

Preferably, in the pressing step, the edge of the outside air introduction hole on the inner bag side is pressed by an insertion tool inserted into the outside air introduction hole.

Preferably, the inserter has a bulging portion having a diameter larger than that of the outside air introduction hole, and the edge portion is pressed by inserting the bulging portion into the outside air introduction hole.

Preferably, the inserter has a tip portion having a diameter smaller than that of the bulging portion on the tip end side of the bulging portion, and the swelling is performed by pushing the inner bag into the inside of the container body by the tip portion. The inner bag is separated from the outer shell before the diameter portion is inserted into the outside air introduction hole.

Preferably, the tip end side and the proximal end side of the bulging portion are formed in a tapered shape, and the inclination of the proximal end side of the bulging portion is formed more gently than the inclination of the distal end side of the bulging portion.

Further, according to the present invention, a container body having an outer shell and an inner bag and the inner bag shrinking from the outer shell as the contents decrease, and an outside air introduction hole penetrating only the outer shell are provided. A laminated peeling container including a valve member that can be opened and closed, the valve member having a shaft portion that is inserted into the outside air introduction hole and slidable with respect to the outside air introduction hole, and an inner bag of the shaft portion. It is provided with a lid portion provided on the side and having a larger cross-sectional area than the shaft portion, and burrs formed on the edge portion of the outside air introduction hole on the inner bag side face outward with respect to the outside air introduction hole. A laminated stripping container that is tilted is provided.

Preferably, the lid portion has an inclined surface that is inclined toward the shaft portion side and is in contact with the edge portion of the outside air introduction hole on the inner bag side, and the inclination angle of the burr is the inclination. It is formed so as to be substantially the same as the inclination angle of the surface or larger than the inclination angle of the inclined surface.

It is a perspective view of the laminated peeling container 1 of 1st Embodiment of this invention. It is an enlarged cross-sectional view around the mouth portion 9 and the outside air introduction hole 15 of the laminated peeling container 1 of FIG. It is an enlarged view of the valve member 5, (a) is a perspective view, and (b) is a side view. It is sectional drawing which shows the layer structure of the outer layer 11 and the inner layer 13. The manufacturing process of the laminated peeling container 1 of FIG. 1 is shown. The manufacturing process of the laminated peeling container 1 of FIG. 1 following FIG. 5 is shown, and in particular, the outside air introduction hole forming and the inner layer preliminary peeling step are shown. 6A and 6B show the configuration of a drilling drill 30 used for forming the outside air introduction hole 15, where FIG. 6A is a front view, FIG. 6B is a left side view, FIG. 6C is a sectional view taken along the line AA, and FIG. 6D is a sectional view taken along the line AA. An enlarged view of the area B and (e) is an enlarged view of the area C. 6A and 6B show another configuration of the drilling drill 30 used for forming the outside air introduction hole 15, where FIG. 6A is a front view and FIG. 6B is a left side view. The manufacturing process of the laminated peeling container 1 of FIG. 1 following FIG. 6 is shown, and in particular, the inner bag separating step and the pressing step are shown. 9 is an explanatory view of an inner bag separating step and a pressing step, where (a) to (c) show an inner bag separating step and (c) to (e) show a pressing step. It is explanatory drawing which shows how the burr Br formed in the outside air introduction hole 15 is deformed in the pressing process of FIG. It is a figure which shows the state which the valve member 5 is attached to the outside air introduction hole 15, (a) is a side view, (b) is an enlarged view of the main part of (a). The process following FIG. 9 of the laminated peeling container 1 of FIG. 1 is shown. It is explanatory drawing which shows the usage method of the laminated peeling container 1 of FIG. 9 is a diagram showing another method of the inner bag separating step and the pressing step, in which FIGS. 9A to 9B show an inner bag separating step and FIG. 9C shows a pressing step.

Hereinafter, embodiments of the present invention will be described. The various features shown in the embodiments shown below can be combined with each other. In addition, the invention is independently established for each feature.

As shown in FIG. 1, the laminated peeling container 1 according to the embodiment of the present invention includes a container body 3 and a valve member 5. The container body 3 includes an accommodating portion 7 for accommodating the contents and a mouth portion 9 for discharging the contents from the accommodating portion 7.

As shown in FIG. 2, the container body 3 includes an outer layer 11 and an inner layer 13 in the accommodating portion 7 and the mouth portion 9, the outer layer 11 constitutes the outer shell 12, and the inner layer 13 constitutes the inner bag 14. To. As the content is reduced, the inner layer 13 is peeled from the outer layer 11, so that the inner bag 14 is peeled from the outer shell 12 and contracts.

The mouth portion 9 is provided with a male screw portion 9d. A cap having a female screw, a pump, or the like is attached to the male screw portion 9d. FIG. 2 illustrates a part of the cap 23 having the inner ring 25. The outer diameter of the inner ring 25 is substantially the same as the inner diameter of the mouth portion 9, and the outer surface of the inner ring 25 comes into contact with the contact surface 9a of the mouth portion 9 to prevent leakage of the contents.

Further, the accommodating portion 7 is provided with a valve member 5 for adjusting the inflow and outflow of air between the intermediate space 21 between the outer shell 12 and the inner bag 14 and the outer space S of the container body 3. The outer shell 12 is provided with an outside air introduction hole 15 that communicates the intermediate space 21 and the outer space S in the accommodating portion 7. The outside air introduction hole 15 is a through hole provided only in the outer shell 12, and does not reach the inner bag 14. As shown in FIGS. 2 and 3, the valve member 5 has a shaft portion 5a arranged in the outside air introduction hole 15 and a lid having a shape capable of closing the outside air introduction hole 15 and arranged in the intermediate space 21. A portion 5c and a locking portion 5b provided on the outer space S side of the shaft portion 5a and preventing the valve member 5 from entering the inside of the outer shell 12 are provided. The diameter of the shaft portion 5a is smaller than the diameter of the outside air introduction hole 15 and can be slidably moved with respect to the outside air introduction hole 15. Further, the diameter of the lid portion 5c is larger than the diameter of the outside air introduction hole 15, and the cross-sectional area is larger than that of the shaft portion 5a.

The lid portion 5c is configured to close the outside air introduction hole 15 when the outer shell 12 is compressed, and is provided with a tapered surface 5d so that the cross-sectional area becomes smaller as it approaches the shaft portion 5a. The inclination angle θ1 of the tapered surface 5d shown in FIG. 3B is preferably 15 to 45 degrees with respect to the direction D in which the shaft portion 5a extends, and more preferably 20 to 35 degrees. This is because if the inclination angle θ1 is too large, air leakage is likely to occur, and if it is too small, the valve member 5 becomes long.

With such a configuration, when the outer shell 12 is compressed, the pressure in the intermediate space 21 becomes higher than the external pressure, and the lid portion 5c is pressed more strongly against the outside air introduction hole 15 by this pressure difference, and the lid portion 5c closes the outside air introduction hole 15. Since the lid portion 5c is provided with the tapered surface 5d, the lid portion 5c easily fits into the outside air introduction hole 15 and closes the outside air introduction hole 15.

When the outer shell 12 is further compressed in this state, the pressure in the intermediate space 21 increases, and as a result, the inner bag 14 is compressed and the contents in the inner bag 14 are discharged. Further, when the compressive force on the outer shell 12 is released, the outer shell 12 tries to be restored by its own elasticity. At this time, the lid portion 5c is separated from the outside air introduction hole 15, the blockage of the outside air introduction hole 15 is released, and the outside air is introduced into the intermediate space 21. Further, the locking portion 5b is provided with a flow passage 5w so that the locking portion 5b does not block the outside air introduction hole 15, and even when the locking portion 5b is in contact with the outer shell 12, it can be distributed. The outside air can be introduced into the intermediate space 21 through the road 5w and the outside air introduction hole 15.

The valve member 5 can be attached to the container body 3 by inserting the lid portion 5c into the intermediate space 21 while the lid portion 5c expands the outside air introduction hole 15. Therefore, it is preferable that the tip of the lid portion 5c has a tapered shape. Since such a valve member 5 can be mounted by simply pushing the lid portion 5c into the intermediate space 21 from the outside of the container body 3, it is excellent in productivity. Further, the valve member 5 is molded by injection molding or the like.

The accommodating portion 7 is covered with a shrink film after the valve member 5 is attached. At this time, the valve member 5 is mounted in the valve member mounting recess 7a provided in the accommodating portion 7 so that the valve member 5 does not interfere with the shrink film. Further, an air flow groove 7b extending in the direction of the mouth portion 9 from the valve member mounting recess 7a is provided so that the valve member mounting recess 7a is not sealed with the shrink film (see FIG. 1).

Next, the layer structure of the container body 3 will be described with reference to FIG. The container body 3 includes an outer layer 11 and an inner layer 13. The outer layer 11 is formed to be thicker than the inner layer 13 so as to have high resilience.

The outer layer 11 is composed of, for example, low-density polyethylene, linear low-density polyethylene, high-density polyethylene, polypropylene, an ethylene-propylene copolymer and a mixture thereof. The outer layer 11 may have a plurality of layers. For example, as shown in FIG. 4, both sides of the repro layer 11c may be sandwiched between layers 11a and 11b formed of a virgin material. Here, the repro layer refers to a layer obtained by recycling burrs generated during molding of a container. Further, the outer layer 11 is formed to be thicker than the inner layer 13 so as to have high resilience. The outer layer 11 is preferably made of a random copolymer between propylene and another monomer. As the monomer copolymerized with propylene, ethylene is particularly preferable as long as it improves the impact resistance of the random copolymer as compared with the homopolymer of polypropylene. In the case of a random copolymer of propylene and ethylene, the ethylene content is preferably 5 to 30 mol%. The weight average molecular weight of the random copolymer is preferably 100,000 to 500,000, more preferably 100,000 to 300,000. The tensile elastic modulus of the random copolymer is preferably 400 to 1600 MPa, preferably 1000 to 1600 MPa. This is because the shape resilience is particularly good when the tensile elastic modulus is in such a range. If the container is excessively hard, the usability of the container deteriorates. Therefore, a flexible material such as linear low-density polyethylene may be mixed with the random copolymer to form the outer layer 11.

The inner layer 13 includes an EVOH layer 13a provided on the outer surface side of the container, an inner surface layer 13b provided on the inner surface side of the container of the EVOH layer 13a, and an adhesive layer 13c provided between the EVOH layer 13a and the inner surface layer 13b. .. By providing the EVOH layer 13a, the gas barrier property and the peelability from the outer layer 11 can be improved.

The EVOH layer 13a is a layer made of an ethylene-vinyl alcohol copolymer (EVOH) resin, and is obtained by hydrolysis of an ethylene-vinyl acetate copolymer. The ethylene content of the EVOH resin is, for example, 25 to 50 mol%, preferably 32 mol% or less from the viewpoint of oxygen barrier properties. The lower limit of the ethylene content is not particularly specified, but it is preferably 25 mol% or more because the flexibility of the EVOH layer 13a tends to decrease as the ethylene content decreases. Further, the EVOH layer 13a preferably contains an oxygen absorber. By containing the oxygen absorber in the EVOH layer 13a, the oxygen barrier property of the EVOH layer 13a can be further improved.

The inner surface layer 13b is a layer that comes into contact with the contents of the laminated stripping container 1, and is, for example, a polyolefin such as low density polyethylene, linear low density polyethylene, high density polyethylene, polypropylene, ethylene-propylene copolymer and a mixture thereof. It is preferably made of low density polyethylene or linear low density polyethylene. The tensile elastic modulus of the resin constituting the inner surface layer 13b is preferably 50 to 300 MPa, preferably 70 to 200 MPa. This is because the inner surface layer 13b is particularly flexible when the tensile elastic modulus is in such a range. Specifically, the tensile elastic modulus is, for example, 50, 100, 150, 200, 250, 300 Mpa, and may be within the range between any two of the numerical values exemplified here.

The adhesive layer 13c is a layer having a function of adhering the EVOH layer 13a and the inner surface layer 13b. For example, an acid-modified polyolefin in which a carboxyl group is introduced into the above-mentioned polyolefin (eg, maleic anhydride-modified polyethylene) is added. , Ethylene Vinyl Acetate Copolymer (EVA). An example of the adhesive layer 13c is a mixture of low-density polyethylene or linear low-density polyethylene and acid-modified polyethylene.

Next, an example of the manufacturing method of the laminated peeling container 1 of the present embodiment will be described.

First, as shown in FIG. 5A, a laminated structure corresponding to the container body 3 to be manufactured (for example, PE layer / adhesive layer / EVOH layer / PP layer / repro layer / PP layer in order from the inner surface side of the container). The laminated polypropylene in the molten state having the laminated structure of the above) is extruded, the laminated polypropylene in the molten state is set in the split mold for blow molding, and the split mold is closed. Next, as shown in FIG. 5B, a blow nozzle is inserted into the opening on the mouth 9 side of the container body 3, and air is blown into the cavity of the split mold in a state where the mold is tightened.

Next, as shown in FIG. 5C, the split mold is opened and the blow-molded product is taken out. The split mold has a cavity shape such that various shapes of the container body 3 such as the valve member mounting recess 7a, the air flow groove 7b, and the bottom seal protrusion 27 are formed on the blow molded product. Further, the split mold is provided with a pinch-off portion on the lower side of the bottom seal protruding portion 27, and a lower burr is formed on the lower portion of the bottom seal protruding portion 27, and this is removed. By the above steps, the container body 3 having the outer shell 12 and the inner bag 14 is formed (container body forming step).

Next, as shown in FIG. 5 (d), the taken-out container main body 3 is aligned.

Next, as shown in FIGS. 6A to 6C, the outside air introduction hole 15 is formed in the outer shell 12 of the container body 3 by using the drilling device 2 (outside air introduction hole forming step). Hereinafter, this step will be described in detail.

First, as shown in FIG. 6A, the container body 3 is set at a position close to the drilling device 2. The drilling device 2 includes a drilling drill 30 having a main body portion 31 and a tip portion 32, and a motor 2c that rotationally drives the drilling drill 30 through a transmission belt 2b. The drilling device 2 is supported by a servo cylinder (not shown) that uniaxially moves the drilling device 2 by rotation of a servomotor, and is supported by an arrow X1 direction in FIG. 6 (a) and an arrow X2 direction in FIG. 6 (c). It is configured to be movable to. With such a configuration, it is possible to press the tip portion 32 of the drill 30 against the outer shell 12 of the container body 3 while rotating the drill 30. Further, by controlling the position and the moving speed of the drilling device 2 by the servomotor, it is possible to shorten the tact time.

The drilling drill 30 is provided with a cavity 33 extending from the main body 31 to the tip 32 (see FIGS. 7 and 8), and a ventilation pipe 2e communicating with the cavity 33 is connected to the drill 30. The ventilation pipe 2e is connected to an intake / exhaust device (not shown). This makes it possible to suck air from the inside of the drill 30 and blow air into the drill 30.

As shown in FIG. 7, the tip portion 32 of the drilling drill 30 has a tubular shape having a C-shaped cross section. The tip portion 32 is provided with a flat surface 34 and a notch 37, and the side surface of the notch 37 is a blade 38. As shown in FIG. 7, the side surface 32a of the tip portion 32 may be perpendicular to the flat surface 34, and as shown in FIG. 8, a tapered surface that inclines toward the center as it approaches the flat surface 34. It may be. In the latter case, since the edge of the formed outside air introduction hole 15 becomes a tapered surface that expands outward, there is an advantage that the valve member 5 can be easily inserted.

The width W of the flat surface 34 in the radial direction is preferably 0.1 to 0.2 mm, more preferably 0.12 to 0.18 mm. If the width W is too small, the inner bag 14 is easily damaged during drilling, and if the width W is too large, the blade portion 38 is difficult to contact the outer shell 12, so that it is difficult to perform drilling smoothly. The range in which the notch 37 is provided is preferably 60 to 120 degrees, more preferably 75 to 105 degrees. If this range is too large, the inner bag 14 is easily damaged during drilling, and if this range is too small, it is difficult to perform drilling smoothly. The angle α of the inclined surface P2 with respect to the circumscribed surface P1 of the blade portion 38 is preferably 30 to 65 degrees, more preferably 40 to 55 degrees. If the angle α is too small, the inner bag 14 is easily damaged during drilling, and if the angle α is too large, it is difficult to perform drilling smoothly.

Further, the inner surface 35 of the tip portion 32 is provided with a tapered surface 36 that extends toward the tip. As a result, the excision piece 15a (see FIG. 6C) generated at the time of drilling does not remain on the container body 3 side, and easily moves to the inner surface 35 side. The angle of the tapered surface 36 with respect to the flat surface 34 is preferably 95 to 110 degrees, more preferably 95 to 105 degrees. In other words, as shown in FIG. 7E, the angle β of the tapered surface 36 with respect to the direction X parallel to the rotation axis of the drill 30 is preferably 5 to 20 degrees, more preferably 5 to 15 degrees. Further, the inner surface 35 is provided with a concave or V-shaped substantially annular groove 39 having a depth of 0.05 to 0.1 mm and a width of 0.1 to 0.2 mm in a direction perpendicular to the flat surface 34 (of the drilling drill 30). It is preferable to apply the cutting piece 15a in the direction X) parallel to the rotation axis at a pitch of 0.2 to 1 mm, and in this case, the cutting piece 15a is more likely to move to the inner surface 35. The pitch of the grooves 39 is more preferably 0.3 to 0.7 mm. Further, it is preferable that the inner surface 35 is blasted, and the excised piece 15a is more easily transferred to the inner surface 35.

Next, as shown in FIG. 6B, the flat surface 34 is pressed against the outer shell 12 while rotating the drilling drill 30. At this time, the flat surface 34 is slightly recessed into the outer shell 12. As a result, the outer shell 12 partially enters the notch 37, the blade portion 38 comes into contact with the outer shell 12, and the outer shell 12 is cut. When the flat surface 34 reaches the boundary between the outer shell 12 and the inner bag 14, the outer shell 12 is hollowed out in a circular shape to form a round hole-shaped outside air introduction hole 15. At this time, by sucking the air inside the drill 30, the cut piece 15a formed by hollowing out the outer shell 12 is sucked into the cavity 33 of the drill 30.

When the flat surface 34 is pressed against the inner bag 14 after the flat surface 34 reaches the boundary between the outer shell 12 and the inner bag 14, the inner bag 14 is peeled off from the outer shell 12 and toward the inside of the container body 3. Since it is easily deformed, the flat surface 34 does not sink into the inner bag 14, the blade portion 38 does not come into contact with the inner bag 14, and the inner bag 14 is prevented from being damaged.

In the present embodiment, the drilling drill 30 is used without heating, which has an advantage that the edge of the outside air introduction hole 15 is not melted and the edge is formed sharply. Further, in order to suppress the influence of heat generated by the friction between the drill 30 and the outer shell 12, the drill 30 is made of a material having high thermal conductivity (example: 35 W / (m · ° C) or more at 20 ° C.). It is preferable to form with. The drilling drill 30 may be heated to facilitate drilling. In this case, the melting point of the resin constituting the outermost layer of the inner bag 14 is preferably higher than the melting point of the resin forming the innermost layer of the outer shell 12 so that the inner bag 14 is not melted by the heat of the drilling drill 30. ..

When a hole 15 is drilled in the outer shell 12 from the outer space S side by the drilling drill 30, burr Br is generated on the inner bag 14 side, that is, the intermediate space 21 side. As shown in FIGS. 10 (a), 10 (b) and 11 (a), the burr Br is formed so as to extend in the direction in which the drill 30 is inserted, that is, substantially perpendicular to the outer shell 12. Although the burr Br is shown in a straight line in FIG. 11 and the like, it is drawn for convenience to indicate the direction in which the burr Br is formed, and does not represent the actual shape. In reality, Bali Br occurs irregularly for each product. If the valve member 5 is attached to the outside air introduction hole 15 in such a state, the burr Br may interfere with the valve member 5 and the valve member 5 may not operate normally. (Bali treatment step) prevents the burr Br from interfering with the valve member 5.

Next, as shown in FIG. 6C, the drilling device 2 is retracted in the direction of arrow X2, and air is blown into the cavity 33 of the drilling drill 30 to release the cutting piece 15a from the tip of the drilling drill 30. ..
By the above steps, the formation of the outside air introduction hole 15 in the outer shell 12 is completed.

Next, as shown in FIG. 6D, the inner bag 14 is preliminarily peeled from the outer shell 12 by blowing air between the outer shell 12 and the inner bag 14 through the outside air introduction hole 15 using the blower 48. (Preliminary peeling step). Further, by blowing a specified amount of air while preventing air leakage through the outside air introduction hole 15, it becomes easy to control the preliminary peeling of the inner bag 14. The preliminary peeling may be performed on the entire accommodating portion 7 or a part of the accommodating portion 7, but the presence or absence of pinholes in the inner bag 14 is checked at the portion where the pre-peeling is not performed. Therefore, it is preferable that the inner bag 14 is preliminarily peeled from the outer shell 12 in substantially the entire accommodating portion 7. The air may be blown between the outer shell 12 and the inner bag 14 by another method. For example, air can be blown between the outer shell 12 and the inner bag 14 through the opening provided in the outer shell 12 in the upper tubular portion 41 shown in FIG. 6 (d).

Next, as shown in FIG. 6E, hot air is applied to the bottom seal protruding portion 27 to soften the thin-walled portion 27a, and the bottom seal protruding portion 27 is bent.

Next, as shown in FIGS. 9A and 9B, the insertion tool 42 is moved as shown in the direction of the arrow X1 to insert the insertion tool 42 through the outside air introduction hole 15. Then, the inner bag 14 is pushed into the inside of the container body 3 by the insertion tool 42 to separate the inner bag 14 from the outer shell 12 (inner bag separation step). According to this method, the inner bag 14 can be locally largely separated from the outer shell 12. Further, following this, the insertion tool 42 is moved as shown in the direction of the arrow X2, and the outside air introduction hole 15 is formed by the enlarged diameter portion 45 (see FIGS. 9A and 10) formed in the insertion tool 42. The edge portion on the inner bag 14 side is pressed toward the outside in the radial direction of the outside air introduction hole 15 (pressing step, but also referred to as a burr treatment step below). By this step, the burr Br formed at the edge of the outside air introduction hole 15 by the outside air introduction hole forming step can be treated so as not to interfere with the valve member 5. Hereinafter, the inner bag separating step and the pressing step (burr processing step) using the inserter 42 will be described in detail.

As shown in FIG. 10, the inserter 42 includes a base end portion 43 held by the jig, a connection portion 44 that is continuous with the base end portion 43 and has a diameter smaller than that of the base end portion 43, and a connection portion 44. It is a rod-shaped member having a continuous bulging portion 45 having the largest diameter and a continuous bulging portion 45 and a tip portion 46 having a rounded tip. Here, the tip portion 46 (and the connecting portion 44) has a diameter that can be inserted into the outside air introduction hole 15 without expanding the outside air introduction hole 15, and the diameter thereof is substantially the same as the diameter of the outside air introduction hole 15. Or smaller than the diameter of the outside air introduction hole 15. The ratio of the diameter of the tip portion 46 to the diameter of the outside air introduction hole 15 is preferably 0.5 to 1.0, more preferably 0.6 to 0.8, and 0.70 to 0.75. Is more preferable. Specifically, the ratio of the diameters is, for example, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0. It is 95, 1.0, and may be within the range between any two of the numerical values exemplified here. Further, the length from the portion having the largest diameter of the bulging portion 45 to the tip of the tip portion 46 is sufficiently longer than the thickness of the outer shell 12, for example, preferably 10 times or more.

Next, as shown in FIG. 11, the bulging portion 45 has a gentle taper shape on both the front end side surface (referred to as the insertion surface 45a) and the proximal end side surface (referred to as the pressing surface 45b). They are smoothly connected to the connecting portion 44 and the tip portion 46, respectively. The tapered insertion surface 45a and pressing surface 45b referred to here are flat surfaces when the vicinity of the portion in contact with the outer shell 12 is viewed microscopically, and are convex outward when viewed macroscopically. It may be in the shape of an arc. Further, the inclination of the insertion surface 45a is formed more gently than the inclination of the pressing surface 45b. This is because when the insertion surface 45a is steeply inclined, it engages with the outer shell 12 when the insertion tool 42 is inserted, elastic energy is accumulated in the outer shell 12, and the enlarged diameter portion 45 passes through the outside air introduction hole 15. This is to prevent the insertion tool 42 from being subjected to a force in the X1 direction and suddenly moving in the X1 direction.

Further, the diameter of the thickest portion of the bulging portion 45 is larger than the diameter of the outside air introduction hole 15, and the ratio of the diameter of the bulging portion 45 (the thickest portion) to the diameter of the outside air introduction hole 15 is 1. It is preferably 0.01 to 1.06, more preferably 1.02 to 1.05, and even more preferably 1.03 to 1.04. Specifically, the ratio of the diameters is, for example, 1.01, 1.015, 1.02, 1.025, 1.03, 1.035, 1.04, 1.045, 1.05. It is 1.055 and 1.06, and may be within the range between any two of the numerical values exemplified here. If the diameter of the bulging portion 45 is too small, the burr Br will remain at a position where it interferes with the valve member 5, and if it is too large, the outside air introduction hole 15 will be deformed. By doing so, these things can be prevented.

In the inner bag separating step, as shown in FIGS. 10A to 10C, the insertion tool 42 having the above configuration is inserted into the outside air introduction hole 15 while moving in the direction of the arrow X1. As shown in FIG. 10B, the inner bag 14 is separated from the outer shell 12 in the vicinity of the outside air introduction hole 15. Here, the expanded diameter portion 45 has a diameter larger than the diameter of the outside air introduction hole 15, but the insertion surface 45a on the tip end portion 46 side of the expanded diameter portion 45 has a gentle taper shape. , It is designed to be smoothly inserted inside the outer shell 12. Further, in the outer shell 12, as shown by the imaginary line 12a in FIG. 10 (c), the edge portion of the outside air introduction hole 15 is elastically deformed in the direction of the inner bag 14, so that the enlarged diameter portion 45 becomes the outside air introduction hole 15. It is possible to pass through.

Since the inner bag 14 has a small restoring force, once it reaches the state shown in FIG. 10 (b), it does not return to the state shown in FIG. 10 (a) even if the inserter 42 is removed. Further, as shown in FIG. 10A, a gap G is formed between the outer shell 12 and the inner bag 14 by the preliminary peeling step, so that when the inserter 42 is pressed against the inner bag 14, it is inserted. In addition to the load from the tool 42 being distributed over a wide range and being transmitted to the inner bag 14, the inner bag 14 is easily deformed toward the inside of the container body 3, so that the inner bag 14 is damaged. There is no. However, depending on the materials of the outer shell 12 and the inner bag 14, the inner bag 14 can be easily peeled off from the outer shell 12. In such a case, the preliminary peeling step may be omitted and the inner bag separating step may be performed.

Next, after inserting the inserter 42 into the outside air introduction hole 15 in the inner bag separating step, in the burr treatment step, as shown in FIGS. 10 (c) to 10 (e), the inserter 42 is inserted in the direction of arrow X2. The burr Br formed on the edge of the outside air introduction hole 15 on the inner bag 14 side shown in FIG. 11A by pulling out from the outside air introduction hole 15 while being moved to is shown in the outside air as shown in FIG. 11B. It is tilted outward with respect to the introduction hole 15.

Specifically, the inserter 42 is moved in the direction of the arrow X2, the pressing surface 45b of the bulging portion 45 is brought into contact with the burr Br, and the inserter 42 is further moved in the direction of the arrow X2 in this state. , The burr Br is pressed outward in the radial direction of the outside air introduction hole 15. As a result, the burr Br is inclined in a direction substantially the same as the inclination of the pressing surface 45b of the enlarged diameter portion 45. Here, the angle formed by the pressing surface 45b of the bulging portion 45 and the moving direction X2 is θ2 (see FIG. 11A), and the angle formed by the originally formed direction of the burr Br and the direction after tilting due to pressing. Is θ3 (see FIG. 11B), then θ2 and θ3 are substantially the same. Therefore, the angle θ2 formed by the pressing surface 45b of the bulging portion 45 with the moving direction X2, that is, the inclination angle θ2 of the pressing surface 45b of the bulging portion 45 is formed on the lid portion 5c of the valve member 5 by the tapered surface 5d ( By setting the inclination angle θ1 of FIG. 3B and FIG. 12B) to be the same as or larger than θ1, the inclination angle θ3 of the burr Br is the same as or greater than the inclination angle θ1 of the tapered surface 5d. Will also grow. By having the burr Br having such a shape, it is possible to prevent the burr Br from interfering with the valve member 5 when the valve member 5 is also mounted on the outside air introduction hole 15 in the valve member mounting step described later. Can be done.

In the burr treatment step, the speed at which the insertion tool 42 is pulled out when the bulging portion 45 passes through the outside air introduction hole 15 after the pressing surface 45b of the bulging portion 45 comes into contact with the burr Br is determined by the inner bag separating step. It is preferable that the moving speed is slower than the moving speed in other situations including when the enlarged diameter portion 45 is inserted into the outside air introduction hole 15 in the above.

Next, as shown in FIGS. 13A to 13B, the robot arm 47 is moved in the direction of the arrow X1 while the valve member 5 is attracted by the robot arm 47, and the valve member 5 is placed in the outside air introduction hole 15. By pushing in, the valve member 5 is attached to the outer shell 12 (valve member attaching step). Specifically, by pushing the lid portion 5c of the valve member 5 into the outside air introduction hole 15 from the outside of the outer shell 12 and inserting it, as shown in FIGS. 12 (a) and 13 (b), the valve member 5 Is attached to the outer shell 12. Since the lid portion 5c has a larger diameter than the outside air introduction hole 15, the lid portion 5c passes through the outside air introduction hole 15 while expanding the outside air introduction hole 15. Then, immediately after the lid portion 5c has passed through the outside air introduction hole 15, the lid portion 5c vigorously moves toward the inside of the container body 3. At this time, if the lid portion 5c collides with the inner bag 14, the inner bag 14 may be damaged. However, in the present embodiment, the inner bag 14 is separated from the outer shell 12 in advance in the inner bag separating step. The lid portion 5c hardly or at all contacts the inner bag 14, and the inner bag 14 is not damaged. On the other hand, when the inner bag 14 is adjacent to the outer shell 12 without performing the inner bag separating step, the lid portion 5c vigorously moves toward the inside of the container body 3 immediately after passing through the outside air introduction hole 15. Then, it collides with the inner bag 14 and damages the inner bag 14. Therefore, it is important to perform the inner bag separating step before the valve member mounting step. In the present embodiment, the valve member 5 opens and closes the outside air introduction hole 15 by opening and closing the gap between the edge of the outside air introduction hole 15 and the valve member 5 by moving the valve member 5. However, the valve member 5 itself may be provided with a through hole and a valve that can be opened and closed, and the through hole may be opened and closed by the action of the valve to open and close the outside air introduction hole 15. Even when the valve member 5 having such a configuration is used, there is a problem that the inner bag 14 may be damaged when the valve member 5 is pushed into the outside air introduction hole 15 from the outside of the outer shell 12. Similar to the present embodiment, it is possible to prevent the inner bag 14 from being damaged by performing the preliminary peeling step and the inner bag separating step before the valve member mounting step.

Next, as shown in FIG. 13 (c), the upper tubular portion 41 is cut.
Next, as shown in FIG. 13D, the inner bag 14 is inflated by blowing air into the inner bag 14.
Next, as shown in FIG. 13E, the inner bag 14 is filled with the contents.
Next, as shown in FIG. 13 (f), the cap 23 is attached to the mouth portion 9.
Next, as shown in FIG. 13 (g), the accommodating portion 7 is covered with a shrink film to complete the product.

The order of the various steps shown here can be changed as appropriate. For example, the hot air bending step may be performed before the outside air introduction hole opening step or before the inner layer preliminary peeling step. Further, the step of cutting the upper tubular portion 41 may be performed before inserting the valve member 5 into the outside air introduction hole 15.

Next, the operating principle when the manufactured product is used will be described.
As shown in FIGS. 14A to 14C, the product filled with the contents is tilted and the side surface of the outer shell 12 is grasped and compressed to discharge the contents. At the start of use, there is substantially no gap between the inner bag 14 and the outer shell 12, so that the compressive force applied to the outer shell 12 becomes the compressive force of the inner bag 14 as it is, and the inner bag 14 is compressed. And the contents are discharged.

The cap 23 has a built-in check valve (not shown), and although the contents in the inner bag 14 can be discharged, the outside air cannot be taken into the inner bag 14. Therefore, when the compressive force applied to the outer shell 12 after discharging the contents is removed, the outer shell 12 tries to return to its original shape by its own restoring force, but the inner bag 14 remains deflated and only the outer shell 12 remains deflated. It will expand. Then, as shown in FIG. 14D, the inside of the intermediate space 21 between the inner bag 14 and the outer shell 12 is in a depressurized state, and the outside air enters the intermediate space 21 through the outside air introduction hole 15 formed in the outer shell 12. be introduced. When the intermediate space 21 is in a reduced pressure state, the lid portion 5c is not pressed against the outside air introduction hole 15, so that the introduction of outside air is not hindered.

Next, as shown in FIG. 14E, when the side surface of the outer shell 12 is gripped and compressed again, the lid portion 5c closes the outside air introduction hole 15, so that the pressure in the intermediate space 21 increases. The compressive force applied to the outer shell 12 is transmitted to the inner bag 14 via the intermediate space 21, and this force compresses the inner bag 14 to discharge the contents.

Next, as shown in FIG. 14 (f), when the compressive force applied to the outer shell 12 after discharging the contents is removed, the outer shell 12 introduces the outside air from the outside air introduction hole 15 into the intermediate space 21. , It is restored to its original shape by its own restoring force.

The present invention can also be implemented in the following aspects.
In the above-described embodiment, the insertion tool 42 having a bulging portion 45 having a diameter larger than that of the outside air introduction hole 15 presses the edge portion of the outside air introduction hole 15 on the inner bag 14 side toward the outside to push the burr Br. Although it was configured to expand, as shown in FIG. 15, it is also possible to treat the burr Br using an inserter 42 that does not have a bulging diameter portion 45. Specifically, a rotating body is attached to the insertion tool 42, and after the preliminary peeling steps of FIGS. 15A to 15B, the insertion tool 42 is inserted into the outside air introduction hole 15 as shown in FIG. 15C. By rotating the tip of the insertion tool 42 so as to draw a circle having a diameter larger than the diameter of the outside air introduction hole 15, the side surface of the insertion tool 42 makes the edge of the outside air introduction hole 15 on the inner bag 14 side outside. It can be pressed toward, and the burr Br can be expanded.
-In the above-described embodiment, the inner bag separating step and the burr treatment step are performed by a series of operations using the same insertion tool 42, but the inner bag separating step and the burr treatment step are performed at different timings. Alternatively, it can be performed using another device. Further, if there is no risk of the inner bag 14 being damaged when the valve member 5 is inserted, it is possible to omit the inner bag separating step and perform only the burr treatment step.

1 Laminated peeling container 3 Container body 5 Valve member 5a Shaft part 5c Lid part 7 Storage part 9 Mouth part 11 Outer layer 12 Outer shell 13 Inner layer 14 Inner bag 15 Outside air introduction hole 21 Intermediate space 42 Insertor 45 Inflated part 45a Insertion surface 45b Pressing surface 46 Tip portion Br Bali θ1 to θ3 Tilt angle

Claims (5)

A container body forming step of forming a container body having an outer shell and an inner bag,
An outside air introduction hole forming step of forming an outside air introduction hole penetrating only the outer shell in the accommodating portion of the container body for accommodating the contents.
A pressing step of pressing the edge of the outside air introduction hole on the inner bag side, and
A valve member mounting process for mounting the valve member capable of opening and closing the outside air introduction hole on the outer shell is provided .
In the pressing step, the edge of the outside air introduction hole on the inner bag side is pressed by an insertion tool inserted into the outside air introduction hole.
The insert has a larger bulge diameter than the outside air introduction hole, the edges Ru is pressed by the bulge is withdrawn from the outside air introduction hole, a manufacturing method of a multilayer peeling vessel. The inserter has a tip portion having a diameter smaller than that of the bulging portion on the tip end side of the bulging portion, and the bulging portion is pushed into the inside of the container body by the tip portion. The method according to claim 1 , wherein the inner bag is separated from the outer shell before being inserted into the outside air introduction hole. The bulge distal side and the proximal side of the respective tapered, the slope of the front end side of the bulge is gently than the slope of the proximal end side of the bulge, claim 1 Or the method according to claim 2. It has a container body having an outer shell and an inner bag, and the inner bag contracts from the outer shell as the contents decrease, and a valve member capable of opening and closing an outside air introduction hole penetrating only the outer shell. It is a laminated peeling container
The valve member has a shaft portion that is inserted into the outside air introduction hole and can slide with respect to the outside air introduction hole, and a lid that is provided on the inner bag side of the shaft portion and has a larger cross-sectional area than the shaft portion. It has a department and
A laminated peeling container in which burrs formed on the edge of the outside air introduction hole on the inner bag side are inclined outward with respect to the outside air introduction hole. The lid portion has an inclined surface that is inclined toward the shaft portion side and is in contact with the edge portion of the outside air introduction hole on the inner bag side, and the inclination angle of the burr is the inclination of the inclined surface. The laminated peeling container according to claim 4 , which is formed so as to be substantially the same as the angle or larger than the inclination angle of the inclined surface.

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