JP5968746B2 - Ring cap for preventing gas filling of double container and double container including the same - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a technique for filling a used double container with a gas and expanding the inner layer body to prevent the contents from being filled again.

  As the double container, for example, the inner layer body is in close contact with the inner side of the outer layer body to form a filling space for the contents, and when the contents are taken out by using a pump attached to the container, the inner layer body becomes the outer layer body. There is known a blow-molded container in which the contents can be efficiently taken out by peeling and shrinking from the inside (see, for example, Patent Document 1).

JP-A-8-52790

  Such double containers are usually used up on the premise that they are used up. In addition, since the inner layer body shrinks as the content decreases, it is generally difficult to refill the content.

However, the inventor of the present application has come to recognize that the contents can be refilled if the inner layer body is inflated and restored after it has been used up.
In this case, if the contents are poured in the state where the inner layer is not completely restored, the contents may overflow from the mouth of the container and contaminate the surroundings, and another kind of contents may be poured. And the contents remaining in the container may be mixed to cause quality degradation.

  An object of the present invention is to provide a double container gas filling prevention ring cap for preventing an inner layer body from expanding even when gas is blown, and a double container including the same. is there.

The ring cap for preventing fluid filling of a double container according to the present invention is a fixed ring portion attached to a mouth tube portion of a double container consisting of an inner layer body that contracts in response to removal of contents and an outer layer body that houses the inner layer body. Have
On the outer peripheral surface of the fixing ring portion, when the inner peripheral surface of the gas supply pipe is fitted, an outer groove that connects the inside of the gas supply pipe to the outside is provided between the gas supply pipe,
The inner peripheral surface of the fixed ring portion, when fitted to the outer peripheral surface of the gas supply pipe, the inner groove to let through the inside of the gas supply pipe to the outside between the gas supply pipe is provided,
In order to secure the outer groove and the inner groove, the cylindrical body portion narrower than the fixed ring portion is raised from the upper surface of the fixed ring portion, and a through hole is formed in the cylindrical body portion.
When the inner peripheral surface of the gas supply pipe is fitted to the outer peripheral surface of the cylindrical body portion, a through hole is secured by contacting the end surface of the gas supply pipe, and the inside of the gas supply pipe is connected to the outside. When an outer protrusion is provided, or when the outer peripheral surface of the gas supply pipe is fitted to the inner peripheral surface of the cylindrical body portion, the through hole is secured by contacting the end surface of the gas supply pipe, and the gas is supplied. Inner protrusions that allow the inside of the supply pipe to communicate with the outside world are provided, or outer protrusions and inner protrusions are provided on the outer peripheral surface and the inner peripheral surface of the cylindrical body part, respectively.

  The ring cap for preventing gas filling according to the present invention includes a double container in which the inner layer body and the outer layer body are assembled separately, and a double container formed by integrally blow-molding the inner layer body and the outer layer body as the inner layer and the outer layer, respectively. However, in the present invention, it is preferably employed for a laminated blow molded container having a peelable inner layer.

  Moreover, the double container provided with the ring cap according to the present invention is formed by fixing the ring cap to the mouth tube portion of the double container. At this time, the double container is either a double container in which the inner layer body and the outer layer body are assembled as separate bodies, or a double container formed by integrally blow-molding the inner layer body and the outer layer body as the inner layer and the outer layer, respectively. Although it can be selected, in the present invention, a laminated blow-molded container having a peelable inner layer is preferable.

  The ring cap for preventing gas filling according to the present invention is a simple operation that is simply attached to the mouth tube portion of a conventional double container, and can release gas to the outside even if blowing is performed using a gas supply pipe. Therefore, it is possible to prevent the contents from being refilled or the like by blowing the gas after it has been used up. Similarly, a double container provided with such a ring cap can prevent refilling of the contents and the like by blowing gas after it has been used up.

(A) is a side view which shows a blow molded bottle provided with a ring cap according to the present invention in a partial cross section together with an overcap, and (b) is a bottom view of the bottle. It is an enlarged view of Fig.1 (a). It is a side view which shows the blow molded bottle with the same ring cap after using up the content in a partial cross section. In the bottle with the cap, it is an enlarged view showing a state when trying to supply air into the inner layer body by fitting the inner peripheral surface of the air supply pipe to the outer peripheral surface of the fixing ring portion. In the bottle with the cap, it is an enlarged view showing a state when trying to supply air into the inner layer body by fitting the outer peripheral surface of the air supply pipe to the inner peripheral surface of the fixing ring portion. In the bottle with a cap, it is an enlarged view which shows a state when it is going to supply air in an inner-layer body by making the outer peripheral surface of a cylinder part fit the inner peripheral surface of an air supply pipe.

  Hereinafter, a blow molded bottle provided with a ring cap for preventing air filling according to the present invention will be described in detail with reference to the drawings.

  In FIG. 1A, reference numeral 1 is a ring cap according to the present invention, and reference numeral 10 is a laminated blow-molded bottle including the ring cap 1. The laminated blow-molded bottle 10 uses a co-extruded synthetic resin (not shown) made of synthetic resin, and the inner layer body 11 and the outer layer body 12 are respectively made of an inner layer (for example, nylon layer) and an outer layer (for example, PP layer) made of different materials. The (polypropylene) layer is integrally formed by direct blow molding. The inner layer body 11 is detachably adhered to the inner side of the outer layer body, and forms a filling space S for the content liquid therein. An overcap 20 is detachably attached to the laminated blow molded bottle 10. In the present embodiment, the overcap 20 is screwed into the mouth tube portion 12a and sealed with a tube portion 21 formed on the inside thereof. Note that an opening 12b for introducing outside air is formed between the inner layer body 11 and the outer layer body 12 in the mouth tube portion 12a. Further, when the bottom portion of the inner layer body 11 and the bottom portion of the outer layer body 12 are pinched off during blow molding, a crack 12c is formed in the pinch off portion at the bottom portion of the outer layer body 12, as shown in FIG. The crack 12c may be an opening for introducing outside air between the inner layer body 11 and the outer layer body 12.

  On the other hand, the ring cap 1 has a fixed ring portion 2 as shown in FIG. The fixing ring portion 2 has an annular groove at the lower end thereof, and is attached to the upper end portion of the mouth tube portion 12a. The fixing ring portion 2 functions as a seal member that seals between the cap portion 12a and the overcap 20 as will be described later. An outer groove 3 is provided on the outer peripheral surface of the fixing ring portion 2. The outer groove 3 is configured by notching the outer peripheral surface of the fixing ring portion 2 along the axis O from the upper end to the lower end. The outer groove 3 can be provided in at least one place with respect to the outer peripheral surface of the fixing ring portion 2.

  On the other hand, an inner groove 4 is provided on the inner peripheral surface of the fixing ring portion 2. The inner groove 4 is configured by cutting out the inner peripheral surface of the fixing ring portion 2 along the axis O from the upper end to the annular seal protrusion 5. In the present embodiment, the seal protrusion 5 seals between the tubular portion 21 that hangs down from the overcap 20. The inner groove 4 can also be provided in at least one place with respect to the inner peripheral surface of the fixing ring portion 2. Further, in this embodiment, in order to give the fixing ring portion 2 a sealing property, the inner groove 4 is configured by notching the inner peripheral surface of the fixing ring portion 2 from the upper end to the annular seal protrusion 5. According to the present invention, as with the outer groove 3, the inner peripheral surface of the fixing ring portion 2 can be formed by cutting out along the axis O from its upper end to its lower end.

  In addition, from the upper surface of the fixing ring portion 2, the cylindrical body portion 6 having a narrower width than that of the fixing ring portion 2 stands integrally. The cylindrical body portion 6 is arranged so as to secure the outer groove 3 and the inner groove 4. In the present embodiment, the outer peripheral surface of the cylindrical body portion 6 is offset radially inward with respect to the outer peripheral surface of the fixing ring portion 2, and the inner peripheral surface of the cylindrical body portion 6 is relative to the inner peripheral surface of the fixing ring portion 2. Are arranged so as to be offset radially outward. A through hole 7 is formed in the cylindrical body portion 6. Further, an outer protrusion 8 and an inner protrusion 9 are integrally provided on the outer peripheral surface and the inner peripheral surface of the cylindrical body portion 6, respectively. The outer protrusion 8 and the inner protrusion 9 are disposed at positions offset in the circumferential direction with respect to the through hole 7. The outer protrusion 8 and the inner protrusion 9 are designed such that their upper end 8 a and upper end 9 a are higher than the through-hole 7. The through hole 7, the outer protrusion 8, and the inner protrusion 9 can be provided in at least one place with respect to the cylindrical body 6.

  Next, the operation and effect of the ring cap 1 will be described.

  FIG. 3 shows a laminated blow-molded bottle 10 having a ring cap 1 after the contents are used up by a trigger pump or the like (not shown). After the contents are used up, as shown in the figure, the inner layer body 11 contracts, so that it is difficult to refill the contents.

Here, FIG. 4 shows a state when air is to be supplied into the inner layer body 11 by fitting the inner peripheral surface of the air supply pipe (gas supply pipe) P to the outer peripheral surface of the fixed ring portion 2. Indicates. In the figure, the arrow is a path r ₁ of air blown from the air supply pipe P. In this case, the outer groove 3 is provided on the outer peripheral surface of the fixing ring portion 2, and the cylindrical portion 6 is provided so as to ensure the outer groove 3. As a result, an annular gap C ₁ is formed between the outer peripheral surface of the cylindrical portion 6 and the inner peripheral surface of the air supply pipe P, and the inner periphery of the outer peripheral surface of the fixing ring portion 2 and the air supply pipe P. A gap C ₂ formed between the outer groove 3 and the inner peripheral surface of the air supply pipe P is formed between the peripheral surface and the peripheral surface. Since the gap C ₁ opened to the inside of the air supply pipe P communicates with the gap C ₂ , the air path r ₁ between the ring cap 1 and the air pipe P allows the inside of the air supply pipe P to communicate with the outside world. Is formed. For this reason, even if it blows in using the air supply pipe P, as shown by the arrow of the figure, air can be released to the outside. Therefore, in this case, the inner layer body 11 cannot be expanded and restored.

FIG. 5 shows a state when air is going to be supplied into the inner layer body 11 by fitting the outer peripheral surface of the air supply pipe P to the inner peripheral surface of the fixing ring portion 2. In the figure, the arrow is the path r ₂ of the air blown out from the air supply pipe P. In this case, an inner groove 4 is provided on the inner peripheral surface of the fixing ring portion 2, and a cylindrical body portion 6 in which a through hole 7 is formed so as to secure the inner groove 4 is provided. Thereby, a gap C ₃ formed between the inner groove 4 and the outer peripheral surface of the air supply pipe P is formed between the inner peripheral surface of the fixing ring portion 2 and the outer peripheral surface of the air supply pipe P. An annular gap C ₄ is formed between the inner peripheral surface of the cylindrical portion 6 and the outer peripheral surface of the air supply pipe P. Since the gap C ₃ opened to the inside of the air supply pipe P communicates with the gap C ₄ and the through hole 7, the inside of the air supply pipe P is connected to the outside between the ring cap 1 and the air pipe P. Two air paths r ₂ are formed. For this reason, even if it blows in using the air supply pipe P, as shown by the arrow of the figure, air can be released to the outside. Therefore, also in this case, the inner layer body 11 cannot be expanded and restored.

FIG. 6 shows a state where air is to be supplied into the inner layer body 11 by fitting the inner peripheral surface of the air supply pipe P to the outer peripheral surface of the cylindrical body portion 6. In the figure, the arrow is the path r ₃ of the air blown out from the air supply pipe P. In this case, a through hole 7 is formed in the cylindrical body portion 6, and an outer protrusion 8 that secures the through hole 7 by contacting the end surface of the air supply pipe is provided on the outer peripheral surface thereof. Thereby, since the inside of the air supply pipe P communicates with the outside through the through hole 7, an air path r ₃ that connects the inside of the air supply pipe P to the outside is provided between the ring cap 1 and the air pipe P. It is formed. For this reason, even if it blows in using the air supply pipe P, as shown by the arrow of the figure, air can be released to the outside. Therefore, also in this case, the inner layer body 11 cannot be expanded and restored. Further, when air is to be supplied into the inner layer body 11 by fitting the outer peripheral surface of the air supply pipe P to the inner peripheral surface of the cylindrical body portion 6, it is provided on the inner peripheral surface of the cylindrical body portion 6. Since the inner projecting portion 9 is in contact with the end surface of the air supply pipe to secure the through hole 7, air can be released to the outside through the through hole 7 as in FIG. 6. In FIGS. 4 to 6, the inner protrusion 9 is omitted for simplification of the drawings. According to the present invention, at least one of the outer protrusion 8 and the inner protrusion 9 can be provided.

  As described above, the ring cap 1 is a simple operation that is simply attached to the mouth tube portion 12a of the conventional laminated blow-molded bottle 10, and even when blowing using the air supply pipe P, gas can escape to the outside. it can. For this reason, the inner layer body 11 cannot be expanded and restored. Therefore, it is possible to prevent the contents from being refilled or the like by blowing the gas after it has been used up. Similarly, the laminated blow-molded bottle 10 including the ring cap 1 can prevent refilling of the contents and the like by blowing gas after it is used up. Furthermore, by preventing the act of refilling in advance, the risk of the contents overflowing from the mouth of the container and contaminating the surroundings can be avoided, and mixing with the remaining liquid caused by another type of content being poured can also be avoided. Therefore, it is possible to avoid quality deterioration and pump operation failure.

  The above are various embodiments of the present invention, but various modifications are possible according to the present invention. For example, the mouth tube portion 12a is not limited to the configuration to be screwed, and includes, for example, a configuration in which plugging is performed by uneven fitting such as undercut fitting. In addition, as described above, the laminated blow-molded bottle 10 can introduce outside air between the inner layer body 11 and the outer layer body 12 through the opening 12b formed in the mouth tube portion 12a. For this reason, the inner layer body 11 and the outer layer body 12 are integrally formed as inner layers (for example, PP (prepropylene)) and outer layers (PET (polyethylene terephthalate)) of different materials by using a laminated preform as an intermediate. Biaxial stretching blow can also be performed. As in the present embodiment, the double container is composed of an inner layer body and an outer layer body, each of which is an inner layer and an outer layer. Heavy containers can also be used. Furthermore, the inner layer body (inner layer) 11 is not limited to a single layer body (single layer), and may be configured as a stacked body (laminated layer). In addition to the trigger pump, various pumps such as a pump having a pressing head and a spray can be attached to the mouth tube portion.

  The present invention can be applied to various objects as long as it is a double container comprising an inner layer body that contracts in response to the contents being taken out and an outer layer body that houses the inner layer body.

DESCRIPTION OF SYMBOLS 1 Air filling prevention ring cap 2 Fixing ring part 3 Outer groove 4 Inner groove 5 Seal protrusion 6 Cylindrical body part 7 Through-hole 8 Outer protrusion part 8a Outer protrusion part end surface 9 Inner protrusion part 9a Inner protrusion part end surface 10 Multilayer blow molding bottle (Double container)
11 Inner layer (inner layer)
12 Outer layer body (outer layer)
12a Mouth tube 12b Opening (outside air introduction hole)
12c crack (outside air introduction hole)
C ₁ -C ₄ gap r ₁ ~r ₃ air path S filling space

Claims (3)

An inner layer body that contracts in response to the removal of the contents, and a fixing ring portion that is attached to the mouthpiece of the double container consisting of an outer layer body that houses the inner layer body,
On the outer peripheral surface of the fixing ring portion, when the inner peripheral surface of the gas supply pipe is fitted, an outer groove that connects the inside of the gas supply pipe to the outside is provided between the gas supply pipe,
The inner peripheral surface of the fixed ring portion, when fitted to the outer peripheral surface of the gas supply pipe, the inner groove to let through the inside of the gas supply pipe to the outside between the gas supply pipe is provided,
In order to secure the outer groove and the inner groove, the cylindrical body portion narrower than the fixed ring portion is raised from the upper surface of the fixed ring portion, and a through hole is formed in the cylindrical body portion.
When the inner peripheral surface of the gas supply pipe is fitted to the outer peripheral surface of the cylindrical body portion, a through hole is secured by contacting the end surface of the gas supply pipe, and the inside of the gas supply pipe is connected to the outside. When an outer protrusion is provided, or when the outer peripheral surface of the gas supply pipe is fitted to the inner peripheral surface of the cylindrical body portion, the through hole is secured by contacting the end surface of the gas supply pipe, and the gas is supplied. A ring cap for preventing gas filling in a double container provided with an inner protrusion that allows the inside of the supply pipe to communicate with the outside, or an outer protrusion and an inner protrusion on the outer peripheral surface and inner peripheral surface of the cylindrical body, respectively. .   A double container provided with a ring cap, wherein the ring cap according to claim 1 is fixed to a mouth tube portion of the double container.   3. The double container according to claim 2, wherein the double container is a laminated blow-molded container having a peelable inner layer.

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