JP6807146B2 - Manufacturing method of multi-layer bottle product and multi-layer bottle product manufactured by the manufacturing method - Google Patents

Description

The present invention relates to a method for producing a multilayer bottle product and a multilayer bottle product produced by the manufacturing method.

Patent Document 1 discloses a two-layer bottle product in which a liquid stock solution is filled between an outer bottle and an inner bottle. In this double-layer bottle product, before filling the undiluted solution, the inner surface of the outer bottle and the outer surface of the inner bottle are in contact with each other with almost no gap, and it is the first time due to the shrinkage deformation of the inner bottle caused by filling (press-fitting) the undiluted solution. A gap (reservoir for storing the undiluted solution) is formed between the two. In this two-layer bottle product, the inner bottle is filled with a pressurizing agent, and the shrink-deformed inner bottle tries to return to its original shape by the pressure of the pressurizing agent, so that the storage portion is filled. The undiluted solution is discharged to the outside.

Japanese Patent No. 5487011

By the way, it has been found by the studies of the present inventors that there are the following problems in manufacturing the above-mentioned double-layer bottle product. That is, when the storage portion between the outer bottle and the inner bottle is filled with the undiluted solution, the inner surface of the outer bottle and the outer surface of the inner bottle are in contact with each other with almost no gap, so that a portion where the undiluted solution is not filled is likely to be formed. .. In particular, there is a problem that the contraction deformation tends to concentrate in the vicinity of the passage communicating with the storage portion on the shoulder of the inner bottle, and the undiluted solution is unevenly distributed.

For example, if the inner bottle is contracted and deformed in advance before filling the stock solution by removing air from the inner bottle, a storage portion for filling the stock solution is secured, and the concentration of contraction deformation near the passage is concentrated. It is thought that it can be avoided. However, in this case, the inner bottle shrinks so as to be distorted based on slight differences in plate thickness and unevenness that occur due to manufacturing errors, so that the deformed shape becomes irregular for each product and the quality varies. Become. In addition, the inner bottle may be deformed by lifting it up, or it may be deformed by involving the bottom part. Due to these deformations, the passage communicating with the storage part is closed, or even if the stock solution is reduced, the inner bottle is deformed. There is a possibility that the shape of the bottle will not be restored (the outer surface of the inner bottle will not come into contact with the inner surface of the outer bottle), and a large amount of undiluted solution will remain in the storage portion.

Therefore, the present invention has been made to solve the above problems, and an object of the present invention is to provide a method for manufacturing a multilayer bottle product capable of controlling irregular shrinkage of an inner bottle.

In order to solve the above problems, the method for manufacturing a multi-layer bottle product of the present application has substantially the same shape as the bottomed tubular outer bottle 2 and the inner surface of the outer bottle 2, and is flexible to be housed in the outer bottle 2. A multi-layer bottle composed of an inner bottle 3 having an inner bottle 3 and a lid 4 for closing the mouth portion 2a of the outer bottle 2 and the mouth portion 3a of the inner bottle 3 is filled with the contents of the stock solution 5 and the pressurizing agent 6. A method for manufacturing a bottle product, in which guide members 17, 18, 19, 20, 2 are contained in an inner bottle 3 located in an outer bottle 2.
It is characterized in that the inner bottle 3 is shrunk with 1, 22, and 23 inserted, and then the undiluted solution 5 and the pressurizing agent 6 are filled, respectively.

In this case, it is preferable that the lower ends of the guide members 17, 18, 19, 20, 21, 22, and 23 are located near the bottom 3c of the inner bottle 3. Further, it is preferable that the lower ends of the guide members 17, 18, 19, 20, 21, 22, and 23 are spherical.

Further, it is preferable that the inner bottle 3 is contracted by filling a gas between the outer bottle 2 and the inner bottle 3 or by reducing the pressure inside the inner bottle 3. Further, it is preferable to heat the inner bottle 3 when the inner bottle 3 is contracted.

It is preferable that irregularities or gaps are formed on the outer surfaces of the guide members 17, 18, 21 and 23. Further, the guide members 18, 19 and 23 may be provided with a gas passage that communicates the inside of the inner bottle 3 with the outside. Further, the guide members 18, 19, 20, and 23 may be provided on the lid 4.

The guide members 17, 21 and 23 may be formed so as to be expandable and contractible. Further, it is preferable to remove the guide members 17 and 21 from the inner bottle 3 after the inner bottle 3 is contracted. Further, the guide member 17 may be bag-shaped and elastic, and may be expanded or contracted by inflating or shrinking in a balloon shape, or the guide members 21 may be arranged on the circumference in an upright state. It has a plurality of arc-shaped rod-shaped bodies 21c whose upper and lower ends are bundled, and these rod-shaped bodies 21c can be expanded or contracted by bending them in the outward diameter direction by pressing downward or by releasing the downward pressing. You may.

In the method for manufacturing a multi-layer bottle structure of the present invention, since the inner bottle is contracted with the guide member inserted in the inner bottle, the contraction shape of the inner bottle can be controlled to obtain an intended shape. Therefore, the shrinkage shape of the inner bottle is substantially constant between the products (that is, the storage portion of the contents, particularly the stock solution is substantially constant), and the variation in quality can be suppressed. In addition, the contracted shape of the inner bottle can be made into a shape that can easily return to the original shape, and as a result, the residual of the stock solution can be suppressed. Since the inner bottle is contracted and deformed in advance before the undiluted solution is filled, it is possible to suppress the concentration of contraction deformation in the vicinity of the passage communicating with the storage portion and secure the passage to the storage portion.

Further, if the lower end of the guide member is located near the bottom of the inner bottle, it is possible to suppress deformation such that the inner bottle is lifted or deformation that involves the bottom. As a result, a passage to the storage portion can be surely secured, the inner bottle can easily return to the original shape, and the residue of the undiluted solution can be further eliminated.

Further, if the lower end portion of the guide member is spherical, it is possible to prevent the bottom portion of the inner bottle from being torn (penetrated) by the guide member when the inner bottle is contracted.

Further, when the inner bottle is contracted, if a gas is filled between the outer bottle and the inner bottle, the inner bottle can be easily contracted and deformed.

Further, even when the pressure inside the inner bottle is reduced, the inner bottle can be easily contracted and deformed.

If the inner bottle is heated when the inner bottle is contracted, the inner bottle is softened and easily contracted.

If unevenness or gaps are formed on the outer surface of the guide member, slack (folds) that occurs when the inner bottle is contracted can be provided at the intended location, quality variation between products can be suppressed, and the appearance can be suppressed. Will also be good.

Further, if the guide member is provided with a gas passage communicating with the inside of the inner bottle, the pressure inside the inner bottle can be reduced through the guide member, and the inner bottle can be easily contracted and deformed.

Further, if the guide member is provided on the lid, the inner bottle can be contracted with the lid attached to the bottle, and the manufacturing process can be simplified.

Further, if the guide member is expandable and contractible, the guide member can be gradually contracted while supporting the gradually contracting inner bottle from the inside, and the inner bottle is contracted along the shape of the guide member. It becomes easy to make it.

In particular, when the guide member swells or shrinks like a balloon, continuous support is possible.

If the guide member is composed of a plurality of rod-shaped bodies, continuous support is possible, the contact area with the inner bottle is reduced, and the guide member can be easily pulled out from the inner bottle.

It is a side sectional view which shows the two-layer bottle product which concerns on 1st Embodiment of this invention. It is a side sectional view which enlarged the vicinity of the lid body of FIG. 3a to 3h are side sectional views showing a method of manufacturing the double-layer bottle product of FIG. 1. It is a plan sectional view of a guide member. It is a side sectional view which shows the two-layer bottle product which concerns on 2nd Embodiment of this invention. 6a to 6c are side sectional views showing a method of manufacturing the double-layer bottle product of FIG. FIG. 7 is a side sectional view showing a double bottle product according to a third embodiment of the present invention. It is a side sectional view which shows the double bottle product which concerns on 4th Embodiment of this invention. It is a side sectional view which shows the two-layer bottle product which concerns on 5th Embodiment of this invention. 10a to 10c are side sectional views showing a method of manufacturing the double-layer bottle product of FIG. 9. 11a to 11f are side sectional views showing a method for manufacturing a double-layer bottle product according to a sixth embodiment of the present invention. It is a side sectional view which shows the three-layer bottle product which concerns on 7th Embodiment of this invention. 13a to 13d are side sectional views showing a method of manufacturing the three-layer bottle product of FIG. 12.

Next, the first embodiment of the double-layer bottle product of the present invention will be described in detail with reference to the drawings. The two-layer bottle product 1 shown in FIGS. 1 and 2 includes an outer bottle 2, a flexible inner bottle 3 housed therein, a mouth portion 2a of the outer bottle 2, and a mouth portion 3a of the inner bottle 3. It is provided with a lid 4 for closing the bottle, a stock solution 5 filled between the outer bottle 2 and the inner bottle 3 (hereinafter referred to as a storage portion), and a pressurizing agent 6 filled in the inner bottle 2. .. Hereinafter, the above components will be described individually.

The outer bottle 2 has a bottomed tubular shape having pressure resistance, and has translucency so that the remaining amount of the undiluted solution 5 can be confirmed. Further, as shown in FIG. 1, a cylindrical body portion 2b, a bottom portion 2c that closes the lower end thereof, a shoulder portion 2d that tapers from the upper end of the body portion 2b, and a cylindrical neck portion that extends from the upper end thereof. It is composed of 2e and a mouth portion 2a at the upper end thereof. A screw 2f is formed on the outer circumference of the neck portion 2e, and a flange portion 2g for suspending and supporting the outer bottle 2 on a transport machine such as a belt conveyor or a filling machine is formed below the screw 2f. ..
Such an outer bottle 2 is molded so as to have pressure resistance by, for example, a synthetic resin such as polyester such as polyethylene terephthalate and polycyclohexanedimethylene terephthalate and polyamide such as nylon. Although it does not have translucency, it may be molded from a metal such as aluminum, tinplate, or stainless steel.

As shown in FIG. 3a, the inner bottle 3 has a shape that comes into contact with the inner surface of the outer bottle 2 before being filled with the undiluted solution 5, that is, has substantially the same shape as the inner surface of the outer bottle 2 (substantially the same shape). Is presented. As shown in FIG. 1, the inner bottle 3 has a cylindrical body portion 3b, a bottom portion 3c that closes the lower end thereof, a shoulder portion 3d that tapers from the upper end of the body portion 3b, and a cylinder extending from the upper end thereof. It is composed of a shaped neck portion 3e, a mouth portion 3a at the upper end thereof, and a flange portion 3f extending in the outer diameter direction from the mouth portion 3a. Further, as shown in FIG. 2, the inner bottle 3 is formed with a communication groove 3g for communicating the storage portion and the atmosphere (outside) from the lower surface of the flange portion 3f to the outer circumference of the neck portion 3e.
Such an inner bottle 3 is molded so as to have flexibility by, for example, a synthetic resin such as polyester such as polyethylene terephthalate and polycyclohexanedimethylene terephthalate, polyamide such as nylon, and polyolefin such as polyethylene and polypropylene. The outer bottle 3 and the inner bottle 2 may be made of the same material or different materials. The term "flexibility" as used herein does not include those that cause a complete return to elasticity after deformation.

The lid 4 is provided with a valve mechanism that closes the mouth portion 2a of the outer bottle 2 and the mouth portion 3a of the inner bottle 3 to communicate / shut off the storage portion and the atmosphere, and the inside of the inner bottle 3 and the atmosphere. As shown in 2, the housing 7 inserted into the mouth portion 3a of the inner bottle 3, the stem 8 housed in the housing 7 so as to be vertically movable, and the stem rubber that closes the stem holes 8c and 8f of the stem 8. It is composed of 10 and 11 and a cap 12 that covers the housing 7 and is fixed to the outer bottle 2.

First, the housing 7 will be described. The housing 7 has a cylindrical body 7a that is internally fitted into the mouth portion 3a of the inner bottle 3 and a flange portion formed so as to project the upper bottom 7b of the cylindrical body 7a in the outer diameter direction. It has a 7c, an upper tubular portion 7d extending upward from the upper bottom 7b of the cylindrical body 7a, and a lower tubular portion 7e extending downward.

Explaining the details, a communication groove 7f for communicating the storage portion and the atmosphere is formed on the upper surface of the flange portion 7c. Further, a notch 7g is formed in a corner portion formed by the lower surface of the flange portion 7c and the outer peripheral surface of the cylindrical body 7a, and the first annular packing (flat plate-shaped ring) 13 is attached to the notch 7g. The first annular packing 13 is compressed between the upper end surface of the flange portion 3f of the inner bottle 3 and the lower surface of the flange portion 7c of the housing 7 in a state where the housing 7 is inserted into the mouth portion 3a of the inner bottle 3. , The space between the two is sealed.
Further, the cylindrical body 7a is also provided with an annular concave groove 7h below the first annular packing 13, and a second annular packing (O-ring) 14 is mounted on the concave groove 7h. The second annular packing 14 has a concave groove on the inner peripheral surface of the mouth portion 3a of the inner bottle 3 and the cylindrical body 7a of the housing 7 in a state where the cylindrical body 7a of the housing 7 is inserted into the mouth portion 3a of the inner bottle 3. It is compressed in the radial direction with the bottom surface of 7h and seals between the two.

By the way, a through hole 7i is formed in the upper bottom 7b of the cylindrical body 7a, and an upper tubular portion 7d is formed so as to surround the through hole 7i. On the side surface of the upper tubular portion 7d, a projecting piece 7j is formed so as to project in the out-of-diameter direction, and the projecting piece 7j is engaged with the engaging projection 12a of the cap 12 described later. Further, a communication hole 7k for communicating the storage portion and the atmosphere is formed below the projecting piece 7j.
The lower tubular portion 7e is formed so as to extend the hole wall of the through hole 7i downward. The lower tubular portion 7e has a bottom portion 7l, and the bottom portion 7l is formed with a communication hole 7m for communicating the inside of the inner bottle 3 with the atmosphere. Further, a connecting cylinder 7n extends downward from the bottom portion 7l. Further, a plurality of elastically deformable projecting pieces 7o extending upward from the bottom portion 7l are formed, and the projecting pieces 7o are housed in a hollow portion between the upper tubular portion 7d and the lower tubular portion 7e. The stem 8 is urged upward.

The stem 8 is a so-called coaxial stem in which a stem is further provided on the outer circumference of the bottomed stem. As shown in FIG. 2, a first stem hole 8c communicating with the inner peripheral side upper end hole 8b of the inner peripheral side stem (hereinafter, referred to as an inner peripheral stem) 8a is formed on the side surface near the bottom. Further, above the first stem hole 8c, a second stem hole 8f communicating with the outer peripheral side upper end hole 8e of the outer peripheral side stem (hereinafter, referred to as the outer peripheral stem) 8d is formed. The first and second stem holes 8c and 8f are closed by the first and second stem rubbers 10 and 11 supported by the tubular fixing member 15 housed in the housing 7, respectively. Further, in the stem 8, the inner peripheral stem 8a projects upward from the outer peripheral stem 8d, and as shown in FIG. 1, the inner peripheral stem 8a closes the inner peripheral side upper end hole 8b at the tip thereof. An injection member 9 that communicates the outer peripheral upper end hole (annular space between the inner peripheral stem 8a and the outer peripheral stem 8d) 8e and the atmosphere of the outer peripheral stem 8d is mounted.

The cap 12 has a cylindrical shape having an upper bottom 12b that covers the upper portion of the housing 7, and the upper bottom 12b is formed with a stem insertion hole 12c for passing the stem 8. Further, the cap 12 is provided with an engaging protrusion 12a on the inner peripheral surface of the upper cylinder portion 12d extending downward from the outer peripheral end of the upper bottom 12b, and engages with the projecting piece 7j provided on the upper cylinder portion 7d of the housing 7. It fits. As a result, the cap 12 and the housing 7 can be handled integrally. Further, the position of the outer peripheral portion of the second stem rubber 11 is fixed by the upper bottom 12b of the cap 12 and the upper tubular portion 7d of the housing 7, and the position of the outer peripheral portion of the first stem rubber 10 is also fixed via the fixing material 15. It is fixed and held at a position where the first stem hole 8c is sealed by the inner diameter portion of the first stem rubber 10 and the second stem hole 8f is sealed by the inner diameter portion of the second stem rubber 11. Further, the cap 12 is provided with a lower cylinder portion 12e below, and a screw 12f is formed on the inner peripheral surface of the lower cylinder portion 12e. Then, the screw 12f is fixed to the outer bottle 2 by being screwed with the screw 2f formed on the outer peripheral surface of the mouth portion 2a of the outer bottle 2.
When the cap 12 is attached to the outer bottle 2, the following actions occur. That is, the third annular packing (O-ring) 16 provided between the outer peripheral surface of the outer bottle 2 and the inner peripheral surface of the cap 12 is compressed in the radial direction. Further, the second annular packing 14 provided in the concave groove 7h of the cylindrical body 7a of the housing 7 is compressed in the radial direction with the inner peripheral surface of the mouth portion 3a of the inner bottle 3. In addition, since the enlarged diameter step portion 12g of the cap 12 presses the flange portion 7c of the housing 7 downward, it is located between the lower surface of the flange portion 7c of the housing 7 and the upper end surface of the flange portion 3f of the inner bottle 3. The first annular packing 13 is compressed. As a result, the flow paths of the stem 8 are all sealed between the outer bottle 2 and the cap 12, between the inner bottle 3 and the housing 7, and the undiluted solution 5 filled in the storage portion is in the atmosphere or in the inner bottle 3. It will be in a blocked state. The pressurizing agent 6 filled in the inner bottle 3 is also in a state of being shielded from the atmosphere by the first stem rubber 10.

Examples of the undiluted solution 5 filled in the storage portion between the outer bottle 2 and the inner bottle 3 include skin care such as lotion, sunscreen, anti-fog, and cleansing, and hair care such as styling agents, treatment agents, and hair dyes. , Sterilizing and disinfecting agents, water bugs, anti-inflammatory analgesics, antipruritic agents, hair restorers, nasal drops, ear drops and other medicines, whipped cream, diet drinks, sports drinks, soft drinks and other foods, indoor air fresheners, deodorants It is filled with household products such as agents, liquid substances such as pest control agents and gardening products such as nutritional products, creams, and gels. The undiluted solution 5 may be discharged in the form of a foam by mixing a foaming agent described later.

Examples of the pressurizing agent 6 filled in the inner bottle 3 include compressed gas such as nitrogen, carbon dioxide, nitrous oxide, oxygen, compressed air and a mixed gas thereof, liquefied petroleum gas, dimethyl ether, and hydrofluoroeolefin. And liquefied gas such as a mixed gas thereof. When a compressed gas is used, it is preferable to fill the double-layer bottle product 1 so that the pressure is 0.1 to 1.0 MPa, particularly 0.15 to 0.8 MPa.

In the two-layer bottle product 1 having the above configuration, when the injection member 9 is pushed down, the stem 8 moves downward, the second stem rubber 11 bends downward, and the second stem hole 8f opens. Then, the undiluted solution 5 filled in the storage portion receives the pressure of the pressurizing agent 6 that tries to restore the shape of the inner bottle 3, and the communication groove 3g of the inner bottle 3 and the communication groove of the flange portion 7c of the housing 7 are used. 7f, the communication hole 7k of the upper tubular portion 7d of the housing 7, the communication groove 15a of the fixing material 15, and the injection member 9 from the outer peripheral side upper end hole 8e through the gap between the inner peripheral surface of the fixing material 15 and the inner peripheral stem 8a. Is discharged from the injection hole of the injection member 9 (solid arrow in FIG. 2). At this time, the first stem rubber 10 also bends downward and the first stem hole 8c opens, but the inner peripheral end hole 8b of the inner peripheral stem 8a is always closed by the injection member 9, so that pressure is applied. The agent 6 is not discharged.

When the undiluted solution 5 is discharged in this way, the inner bottle 3 that has been contracted by the undiluted solution expands, the volume of the storage portion between the outer bottle 2 and the inner bottle 3 decreases, and eventually the outer bottle The inner surface of 2 and the outer surface of the inner bottle 3 come into contact with each other. Therefore, if the outer bottle 2 has translucency, the color of the stock solution 5 can be seen through while the stock solution 5 is present, and at the same time when the stock solution 5 disappears, the inner bottle 3 can be seen through. The pressurizing agent 6 in the inner bottle 3 can be discharged to the outside by removing the injection member 9 and pushing down the stem 8, so that the pressure agent 6 can be safely disposed of.

Next, a method for producing the double-layer bottle product 1 according to the first embodiment of the present invention will be described with reference to FIGS. 3a to 3h. First, the preform for the outer bottle 2 and the preform for the inner bottle 3 are individually molded by injection molding or the like, and the preform for the inner bottle 3 is inserted into the preform for the outer bottle 2 to double the plastic. Prepare for remodeling. In addition, this double preform may be integrally molded by injection molding.
Next, the outer bottle 2 and the inner bottle 3 are simultaneously molded by blowing (specifically, biaxial stretching blow) or the like in the blow mold with this double preform. As a result, as shown in FIG. 3a, the outer shape of the inner bottle 3 is in contact with the inner surface of the outer bottle 2, that is, substantially the same shape as the inner surface of the outer bottle 2.

Next, as shown in FIG. 3b, the guide member 17 is inserted into the inner bottle 3. As shown in FIGS. 3 and 4, the guide member 17 is a hollow substantially rod-shaped elastic body having a spherically formed lower end portion, and the lower end portion thereof is in contact with the bottom portion 3c of the inner bottle 3. It is said that. Further, convex portions (vertical ribs) 17a and concave portions (vertical grooves) 17b extending in the vertical direction are alternately and regularly formed on the outer peripheral surface. Further, the vicinity of the upper end portion has a diameter smaller than the inner diameter of the mouth portion 3a of the inner bottle 3, and even when the guide member 17 is inserted into the inner bottle 3, the inside of the inner bottle 3 and the atmosphere can be maintained in a communicative state. It has become like.
Such a guide member 17 is made of an elastic material such as synthetic rubber or silicone rubber.
Then, as shown in FIG. 3c, an air supply / exhaust device (not shown) such as a pump is connected to the opening of the guide member 17 and inflated to the extent that it does not come into contact with the inner surface of the inner bottle 3.

Next, as shown in FIG. 3d, the storage portion is filled with gas through the communication groove 3g of the inner bottle 3. When filled with gas, the inner bottle 3 is contracted (compressed in the radial direction) by the pressure and comes into contact with the outer surface of the balloon-shaped inflated guide member 17. A heated gas may be used. In this case, the inner bottle 3 softens and easily shrinks. The air in the inner bottle 3 is naturally discharged to the outside through the gap formed between the mouth portion 3a and the guide member 17.
Further, as shown in FIG. 3e, air is evacuated from the guide member 17 and gradually contracted (withered) in accordance with the contraction of the inner bottle 3 due to gas filling. At this time, it is preferable that the inner surface of the inner bottle 3 is maintained in contact with the outer surface of the guide member 17 with almost no gap, and the inner bottle 3 is supported from the inside. By doing so, the irregular contraction of the inner bottle 3 is suppressed, and the inner bottle 3 is easily contracted and deformed along the shape of the guide member 17.
After the guide member 17 is completely contracted, the guide member 17 is pulled out from the inner bottle 3 as shown in FIG. 3f. At this time, the inner bottle 3 is in a state in which slack 3h is regularly formed along the unevenness provided on the outer circumference of the guide member 17, and this state is maintained.

Then, as shown in FIG. 3g, the lid 4 is screwed into the outer bottle 2, the stock solution 5 is filled in the storage portion, and the pressurizing agent 6 is filled in the inner bottle 2. The storage portion is filled with the undiluted solution 5 by pressing the stem 8 downward with the inner peripheral upper end hole 8b of the inner peripheral stem 8a closed and passing through the route indicated by the solid arrow in FIG. At this time, since the inner bottle 3 is contracted, a passage to the storage portion is secured, and the undiluted solution 5 can be smoothly filled. Further, the inner bottle 3 is filled with the pressurizing agent 6 through the route indicated by the dotted arrow in FIG. 2 by pressing the stem 8 downward while the outer peripheral upper end hole 8e of the outer peripheral stem 8d is closed. Before attaching the lid 4 (FIG. 3f), the stock solution 5 may be filled in the storage portion from the communication groove 3g.

The air in the inner bottle 3 before filling the pressurizing agent 6 presses the stem 8 downward after filling the stock solution 5 (FIG. 3g) with the outer peripheral upper end hole 8e of the outer peripheral stem 8d closed. It can be discharged by. The air in the storage portion can be discharged by keeping the outer peripheral side upper end hole 8e of the outer peripheral stem 8d open when the pressurizing agent 6 is filled.

After filling the stock solution 5 and the pressurizing agent 6 (FIG. 3h), the stem 8 is pushed down with the injection hole 8b of the inner peripheral stem 8a closed, the air remaining in the storage section is discharged, and the storage section is filled with the stock solution 5. Fill (make it liquidtight). Further, the stock solution 5 and the pressurizing agent 6 remaining in the stem 8 are removed to complete the production of the double-layer bottle product 1.

In the above manufacturing method, since the inner bottle 3 is contracted with the guide member 17 inserted in the inner bottle 3, the inner bottle 3 can be contracted along the guide member 17, and the inner bottle 3 has an intended shape. Can be transformed into. Therefore, it is possible to suppress variations in quality between products, and it is also possible to fill the storage portion between the outer bottle 2 and the inner bottle 3 with a substantially uniform thickness. Further, since the outer surface of the guide member 17 is uneven, the slack 3h due to the contraction of the inner bottle 3 can be provided at an intended location. Therefore, for example, even if the outer bottle 2 has translucency, it looks good, and further, the regularly formed slack 3h has an effect that the inner bottle 3 easily returns to its original shape.

Further, since the lower end portion of the guide member 17 is in contact with the bottom portion 3c of the inner bottle 3 before shrinkage deformation, it is possible to suppress deformation such that the inner bottle 3 is lifted or deformation such that the bottom portion 3c is involved. It is possible to prevent the shoulder portion 3d of the inner bottle 3 from blocking the communication passage 3g, and to evenly fill the storage portion with the stock solution 5.

Further, when the inner bottle 3 is contracted and deformed (a storage portion is formed between the outer bottle 2 and the inner bottle 3), a gas having a much lower viscosity than the undiluted solution 5 is used, so that the inner bottle 3 communicates with the inner bottle 3. There is little possibility that shrinkage deformation will concentrate in the vicinity of the groove 3g, and the inner bottle 3 can be easily and uniformly shrunk. Further, since the method of contracting the guide member 17 as the inner bottle 3 contracts is also adopted, the inner bottle 3 can be easily contracted along the guide member 17, and the inner bottle 3 can be contracted more easily. be able to.

Next, the double-layer bottle product 1A according to the second embodiment of the present invention will be described in detail with reference to the drawings. The two-layer bottle product 1A of the second embodiment is characterized in that the guide member 18 is attached to the lid 4 as shown in FIGS. 5 and 6a to 6c. Therefore, unlike the guide member 17 of the above embodiment, the guide member 18 is not removed from the inner bottle 3 and remains in the inner bottle 3.

The guide member 18 is made of a hard resin such as polybutylene terephthalate or polyacetal, and as shown in FIG. 5, the lower end portion is formed in a spherical shape, and the convex portion 18a and the concave portion 18b are formed in a spiral shape. It has a hollow rod shape, and a plurality of communication holes 18d for communicating the inside of the inner bottle 3 and the hollow portion 18c are formed on the surface thereof so as to be along the recess 18b. The hollow portion 18c can communicate with the atmosphere through the route indicated by the dotted arrow in FIG. 2 in a state of being attached to the connecting cylinder 7n of the housing 7 of the lid body 4. Therefore, when the stem 8 is pressed downward, the inside of the inner bottle 3 and the atmosphere communicate with each other via the guide member 18.

Explaining the manufacturing method, first, as shown in FIG. 6a, the guide member 18 is attached to the mouth portions 2a and 3a of the outer bottle 2 and the inner bottle 3 formed by molding a double preform by biaxial stretching blow or the like. The attached lid 4 is screwed on. At this time, the lower end portion of the guide member 18 is located in the vicinity of the bottom portion 3c, although it does not abut on the bottom portion 3c of the inner bottle 3.
Next, with the stem 8 pressed downward, an air supply / exhaust device (not shown) such as a pump is connected to the inner peripheral stem 8a via a gas passage including a communication hole 18d and a hollow portion 18c of the guide member 18. , The air in the inner bottle 3 is evacuated. Since the communication hole 18d is formed so that the opening diameter increases toward the lower side, the pressure is smoothly reduced even on the lower side of the inner bottle 3. When the inner bottle 3 is depressurized, the injection hole 8e of the outer stem 8d is opened so that air is supplied between the outer bottle 2 and the inner bottle 3 as the inner bottle 3 contracts. deep. However, it may be filled with gas (heating gas may be used) instead.
When the air inside the inner bottle 3 is sufficiently evacuated, the inner bottle 3 is deformed along the outer shape of the guide member 18 as shown in FIG. 6b. That is, the shape is such that irregularities are formed in a spiral shape.
Then, as shown in FIG. 6c, the storage portion is filled with the undiluted solution 5 and the inner bottle 3 is filled with the pressurizing agent 6, and the air in the storage portion is discharged to the outside to complete the production of the double-layer bottle product 1A. To do. The filling method is the same as that of the above embodiment. However, the point that the pressurizing agent 6 is filled in the inner bottle 3 through the hollow portion 18c of the guide member 18 and the communication hole 18d is peculiar to the present embodiment.

In the method for manufacturing the double-layer bottle product 1A of the present embodiment, since the inner bottle 3 is contracted with the lid 4 attached, it is not necessary to pay attention to the return of air into the inner bottle 3. There is an advantage that the shrinking work of the inner bottle 3 can be easily performed. Moreover, since the guide member 18 is not pulled out, the work process is simplified accordingly.

Next, the double-layer bottle product 1B according to the third embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 7a, the double-layer bottle product 1B of the third embodiment has a tube shape in which the guide member 19 has a hollow portion 19a and is smooth inside and outside as compared with the double-layer bottle product 1A of the second embodiment. It is characterized in that it has a spherical attachment 19b at the lower end thereof, which directs the opening of the hollow portion 19a to the side.

Even with such a guide member 19, it is possible to suppress deformation such that the inner bottle 3 is lifted and deformation such that the bottom portion 3c is involved. Further, since the lower end portion is spherical (spherical), it is possible to prevent the guide member 19 from breaking (penetrating) the bottom portion 3c of the inner bottle 3 when the inner bottle 3 is contracted.

Further, the double-layer bottle product 1B of the third embodiment is different from the double-layer bottle product 1A of the second embodiment in the filling positions of the stock solution 5 and the pressurizing agent 6 (opposite). It has the characteristics of. More specifically, in the present embodiment, the inner bottle 3 is filled with the undiluted solution 5, and the storage portion is filled with the pressurizing agent 6. The injection member 9A communicates with the inner peripheral side upper end hole 8b of the inner peripheral stem 8a and the atmosphere, but the outer peripheral side upper end hole 8e of the outer peripheral stem 8d is always closed. Therefore, the undiluted solution 5 filled in the inner bottle 3 is discharged from the injection member 9A through the hollow portion 19a through the side opening of the attachment 19b of the guide member 19 and via the first stem hole 8c and the inner peripheral side upper end hole 8b. However, the pressurizing agent 6 filled in the storage portion between the outer bottle 2 and the inner bottle 3 is not discharged. In this double-layer bottle product 1B, the inner bottle 3 shrinks as the undiluted solution 5 is discharged, but since the opening of the hollow portion 19a faces sideways, the opening is closed by the shrinking inner bottle 3. It can be suppressed.

Next, the double-layer bottle product 1C according to the fourth embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 8, the double-layer bottle product 1C of the fourth embodiment has a storage portion in that the guide member 20 does not have a hollow portion as compared with the double-layer bottle product 1B of the third embodiment. It is characterized in that the undiluted solution 5 is filled and the inner bottle 3 is filled with the pressurizing agent 6.

Even in such a guide member 20, it is possible to suppress deformation such that the inner bottle 3 is lifted and deformation such that the bottom portion 3c is involved. Further, since the lower end portion is spherical (spherical), it is possible to prevent the guide member 20 from breaking (penetrating) the bottom portion 3c of the inner bottle 3 when the inner bottle 3 is contracted. Since the guide member 20 is attached to the connection cylinder 7n of the housing 7, a communication hole 7p is provided on the side surface of the lower cylinder portion 7e of the housing 7, and the air in the inner bottle 3 is evacuated or pressurized. The agent 6 is prepared so that it can be discharged at the time of filling and disposal.

9 and 10 further show the double-layer bottle product 1D according to the fifth embodiment of the present invention. The double-layer bottle product 1D of the fifth embodiment is characterized by the guide member 21 as shown in FIG. 10a or FIG. 10b. That is, in the two-layer bottle product 1 of the first embodiment, the guide member 17 which is hollow rod-shaped and inflates like a balloon is used, but in the present embodiment, the guide member 21 which is composed of only the skeleton is used. Is used.

Specifically, the guide member 21 includes a plug 21a that closes the mouth portion 3a of the inner bottle 3, a pipe 21b that penetrates the plug 21a and forms a gas passage that communicates the inside of the inner bottle 3 with the atmosphere. It is composed of a plurality of rod-shaped bodies 21c attached to the lower end of the pipe 21b. The rod-shaped body 21c is formed by, for example, a stainless steel rod (wire) curved in an arc shape and has elasticity. Further, the upper end portion and the lower end portion are connected by a pin that allows rotation, and a pin is also provided in the intermediate portion. Then, in the upright state, they are bundled in a state of being arranged on the circumference so that the protruding side of the arc faces outward. Therefore, as shown in FIG. 10b, when the lower end portion of the rod-shaped body 21c is pressed against the bottom portion 3c of the inner bottle 3 in the state where the guide member 21 is inserted into the inner bottle 3, the intermediate portion of the rod-shaped body 21c expands outward. It swells like this. In this state, as in the first embodiment, gas (heating gas may be used) is filled between the outer bottle 2 and the inner bottle 3, and the air in the inner bottle 3 is pumped from the pipe 21b of the guide member 21. The inner bottle 3 is contracted along the guide member 21 by pulling it out using an air supply / exhaust device (not shown). At this time, since the inner bottle 3 is deformed so as to enter the gap between the rod-shaped bodies 21c and 21c, the slack 3h caused by the contraction is regularly formed.
After that, the pressing of the guide member 21 is gradually released in accordance with the contraction of the inner bottle 3, the rod-shaped body 21c is contracted to the original shape, and then the rod-shaped body 21c is withdrawn from the inner bottle 3. Then, as shown in FIG. 10c, after the lid 4 is attached, the storage portion is filled with the undiluted solution 5, and the inner bottle 3 is filled with the pressurizing agent 6, respectively, to complete the production. The filling method is the same as that of the above embodiment.

In the method for manufacturing the two-layer bottle product 1D of the present embodiment, since the guide member 21 is mainly composed of the rod-shaped body 21c, the contact area with the inner surface of the inner bottle 3 becomes small, and the work of extracting from the inner bottle 3 Becomes easier. Further, in the case of the first embodiment of FIGS. 3a to 3h, the depth of the slack 3h due to the contraction of the inner bottle 3 is limited, that is, the depth of the unevenness of the guide member 17 is the limit. In the case of the form, there is no such limitation, and there is an advantage that the inner bottle 3 can be contracted without difficulty. Further, since the lower end portion is a pin that allows rotation and has a spherical shape, the guide member 21 breaks (penetrates) the bottom portion 3c of the inner bottle 3 when the inner bottle 3 contracts. Is also prevented.

Next, the double-layer bottle product 1E according to the sixth embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 11, in the double-layer bottle product 1E of the sixth embodiment, the guide member 22 has a simple shape, for example, a circular or elliptical cross section as compared with the double-layer bottle product 1 of the first embodiment. It is characterized by the fact that it has a polygonal columnar shape (rod shape). Even in this case, the shape of the inner bottle 3 after shrinkage becomes substantially constant, and irregular shrinkage of the inner bottle 3 can be suppressed. The manufacturing method is the same as that of the first embodiment except that it does not have a step of inflating the guide member 17 and a step of inflating the guide member 17, and therefore the steps are shown in FIGS. 11a to 11f. Description will be omitted. Also in this embodiment, the lower end portion of the guide member 22 is formed in a spherical shape, and the guide member 22 breaks (penetrates) the bottom portion 3c of the inner bottle 3 when the inner bottle 3 contracts. Is prevented.

Next, the three-layer bottle product 1F according to the seventh embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIGS. 12 and 13, the three-layer bottle product 1F of the seventh embodiment further provides a pouch 24 in the inner bottle 3, and the pouch 24 and the tube 25 act as a guide member 23. It has the characteristics of.
The pouch 24 is formed by laminating a resin sheet such as polyethylene or polyethylene terephthalate on both sides of a metal foil such as aluminum foil and forming it in a bag shape, and is attached to a tube 25 by welding or the like, and is a stock solution separate from a storage portion. It is said that 5 can be filled. The tube 25 is provided with a mounting portion 25a to be mounted on the connection cylinder 7n of the housing 7 at the upper end, a welding portion 25b for welding the pouch 24 at the lower end thereof, and a plurality of constricted portions 25c below the mounting portion 25c. A disk-shaped bottom portion 25d having a spherical lower surface is provided. In such a three-layer bottle product 1G, different types of undiluted solution 5 can be filled in the storage portion and the pouch 24, and for example, a two-component hair dye or a foaming agent that requires mixing of two solutions. Is particularly suitable for those using.

The three-layer bottle product 1F is manufactured as follows. First, the tube 25 and the pouch 24 attached to the lid 4 are inserted into the blow-molded outer bottle 2 and inner bottle 3 (FIG. 13a). At this time, the lid 4 is in a floating state, that is, the first to third annular packings 13, 14 and 16 are not used.
Next, the storage portion between the outer bottle 2 and the inner bottle 3 is filled with gas to contract the inner bottle 3. At this time, the pouch 24 and the tube 25 function as the guide member 23, and the inner bottle 3 is the pouch. It contracts and deforms along the outer surface of 24 (FIG. 13b). When the inner bottle 3 is contracted, the shrinkage shape and size of the inner bottle 3 can be adjusted by filling the inside of the pouch 24 with air or the like. Therefore, the same as the manufacturing method of FIG. The inner bottle 3 can be contracted while discharging the air in the pouch 24.
Then, the pressurizing agent 6 is filled in the inner bottle 3 through the gap between the inner bottle 3 and the housing 7, and at the same time when the filling is completed, the lid 4 is completely screwed to the outer bottle 2 and sealed (so-called). Undercup filling: FIG. 13c).
Then, the storage portion is filled with the first stock solution 5a through the outer peripheral stem 8d. Further, the pouch 24 is filled with the second stock solution 5b through the inner peripheral stem 8a, the hollow portion 25e of the tube 25, and the communication hole 25f (FIGS. 12 and 13d). Then, by attaching the injection member 9B to the stem 8, the production of the three-layer bottle product 1F is completed. The injection member 9B is configured so that neither the inner peripheral side upper end hole 8b of the inner peripheral stem 8a nor the outer peripheral side upper end hole 8e of the outer peripheral stem 8d is closed, and by pushing down the injection member 9B, the storage portion Both the first undiluted solution 5a and the second undiluted solution 5b in the pouch 24 are discharged from the injection member 9B.

Although the typical embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the present invention. For example, the outer bottle 2 and the inner bottle 3 are simultaneously molded by biaxial stretching blow or the like, but the method is not limited to this method. For example, each bottle is molded separately. After that, various known methods such as folding the inner bottle 3 and inserting it into the outer bottle 2 can be adopted. In addition, not limited to the double-layer bottle product of the outer bottle 2 and the inner bottle 3, a separate bottle is provided between the outer bottle 2 and the inner bottle 3 and inside the inner bottle 3, instead of a pouch. It may be a multi-layer bottle product having three or more layers formed from reform (multiple preform). Further, in the above embodiment, the inner bottle 3 is filled with the pressurizing agent, but a manual or electric pump mechanism is incorporated in the lid 4, and air is press-fitted into the inner bottle 3 as the pressurizing agent 6. The stock solution 5 may be discharged by pressure.

1, 1A, 1B, 1C, 1D, 1E ... Double layer bottle product 1F ... Three layer bottle product 2 ... Outer bottle 2a ... Mouth 2b ... Body 2c ... Bottom 2d ... Shoulder 2e ...・ Neck part 2f ・ ・ Screw 2g ・ ・ Flange part 3 ・ ・ Inner bottle 3a ・ ・ Mouth part 3b ・ ・ Body part 3c ・ ・ Bottom part 3d ・ ・ Shoulder part 3e ・ ・ Neck part 3f ・ ・ Flange part 3g ・ ・ Communication groove 3h・ ・ Looseness 4 ・ ・ Lid body 5 ・ ・ Undiluted solution 5a ・ ・ First undiluted solution 5b ・ ・ Second undiluted solution 6 ・ ・ Pressurizer 7 ・ ・ Housing 7a ・ ・ Cylindrical body 7b ・ ・ Upper bottom 7c ・ ・ Flange part 7d・ ・ Upper cylinder part 7e ・ ・ Lower cylinder part 7f ・ ・ Communication groove 7g ・ ・ Notch 7h ・ ・ Concave groove 7i ・ ・ Through hole 7j ・ ・ Projection piece 7k ・ ・ Communication hole 7l ・ ・ Bottom part 7m ・ ・ Communication hole 7n ・ ・ Connection cylinder 7o ・ ・ Protruding piece 7p ・ ・ Communication hole 8 ・ ・ Stem 8a ・ ・ Inner circumference stem 8b ・ ・ Inner circumference side upper end hole 8c ・ ・ First stem hole 8d ・ ・ Outer circumference stem 8e ・ ・ Outer circumference side Upper end hole 8f ... 2nd stem holes 9, 9A, 9B ... Injection member 10 ... 1st stem rubber 11 ... 2nd stem rubber 12 ... Cap 12a ... Engagement protrusion 12b ... Upper bottom 12c ... Stem insertion hole 12d ・ ・ Upper cylinder part 12e ・ ・ Lower cylinder part 12f ・ ・ Screw 12g ・ ・ Diameter expansion step part 13 ・ ・ First annular packing 14 ・ ・ Second annular packing 15 ・ ・ Fixing material 15a ・ ・ Communication groove 16 ・ ・ Third annular packing 17 ・ ・ Guide member 17a ・ ・ Convex 17b ・ ・ Concave 18 ・ ・ Guide member 18a ・ ・ Convex 18b ・ ・ Concave 18c ・ ・ Hollow part 18d ・ ・ Communication hole 19 ・ ・ Guide member 19a ... Hollow part 19b ... Attachment 20 ... Guide member 21 ... Guide member 21a ... Plug body 21b ... Pipe 21c ... Rod-shaped body 22 ... Guide member 23 ... Guide member 24 ... Pouch 25 ... Tube 25a ... Mounting part 25b ... Welding part 25c ... Constricted part 25d ... Bottom 25e ... Hollow part 25f ... Communication hole

Claims (12)

With a bottomed tubular outer bottle
A multi-layer bottle consisting of a flexible inner bottle that has substantially the same shape as the inner surface of the outer bottle and is housed in the outer bottle, and a lid that closes the mouth of the outer bottle and the mouth of the inner bottle.
A method for manufacturing a multi-layer bottle product that fills the contents consisting of a stock solution and a pressurizing agent.
The outer bottle and the inner bottle are molded double preforms in which the preform for the inner bottle is inserted into the preform for the outer bottle.
A guide member is inserted into the inner bottle that has been housed in the outer bottle, and in that state, the inner bottle is contracted by filling gas between the outer bottle and the inner bottle, and then the inner bottle or the outer bottle is combined. A method for producing a multi-layer bottle product, which comprises filling an undiluted solution between an inner bottle and a pressurizing agent on the other side. Guide member, the manufacturing method of the multilayer bottle article of claim 1 Symbol mounting includes a gas passage for communicating the inner bottle and the outside. The method for manufacturing a multilayer bottle product according to claim 1 or 2, wherein the guide member is provided on the lid. With a bottomed tubular outer bottle
A multi-layer bottle consisting of a flexible inner bottle that has substantially the same shape as the inner surface of the outer bottle and is housed in the outer bottle, and a lid that closes the mouth of the outer bottle and the mouth of the inner bottle.
A method for manufacturing a multi-layer bottle product that is filled with the contents of a stock solution and a pressurizing agent.
The outer bottle and the inner bottle are molded double preforms in which the preform for the inner bottle is inserted into the preform for the outer bottle.
A guide member formed to be expandable and contractible is inserted into the inner bottle contained in the outer bottle, and in that state, the inner bottle is contracted, and then the inner bottle or the undiluted solution is placed between the outer bottle and the inner bottle. A method for producing a multi-layer bottle product, which comprises filling the bottle with a pressurizing agent. With a bottomed tubular outer bottle
A multi-layer bottle consisting of a flexible inner bottle that has substantially the same shape as the inner surface of the outer bottle and is housed in the outer bottle, and a lid that closes the mouth of the outer bottle and the mouth of the inner bottle.
A method for manufacturing a multi-layer bottle product that fills the contents consisting of a stock solution and a pressurizing agent.
The outer bottle and the inner bottle are molded double preforms in which the preform for the inner bottle is inserted into the preform for the outer bottle.
The guide member is inserted into the inner bottle contained in the outer bottle, and in that state, the inner bottle is contracted, then the guide member is pulled out from the inner bottle, and the undiluted solution is placed between the inner bottle or the outer bottle and the inner bottle. A method for producing a multi-layer bottle product, which comprises filling the bottle with a pressurizing agent. The method for producing a multi-layer bottle product according to claim 4 or 5 , wherein the guide member has a bag shape and elasticity, and can be expanded and contracted by inflating or shrinking in a balloon shape. The guide members have a plurality of arcuate rod-shaped bodies arranged on the circumference in an upright state and the upper and lower ends are bundled, and these rod-shaped bodies are bent outward by pressing downward or downward. The method for manufacturing a multilayer bottle product according to claim 4 or 5 , wherein the expansion / contraction is possible by releasing the pressing. The method for manufacturing a multilayer bottle product according to any one of claims 1 to 7, wherein the lower end of the guide member is located near the bottom of the inner bottle. The method for manufacturing a multilayer bottle product according to any one of claims 1 to 8, wherein the lower end portion of the guide member is spherical. The method for producing a multilayer bottle product according to any one of claims 1 to 9 , wherein the shrinkage of the inner bottle is performed by depressurizing the inside of the inner bottle. The method for producing a multilayer bottle product according to any one of claims 1 to 10 , wherein the inner bottle is heated when the inner bottle is shrunk. The method for manufacturing a multilayer bottle product according to any one of claims 1 to 11 , wherein irregularities or gaps are formed on the outer surface of the guide member.

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