JP6029917B2 - Double container, preform for the container, and method for manufacturing the container - Google Patents

Description

  The present invention has a double container comprising an inner layer body that has a filling space for the contents and is reduced in volume as the contents are poured out, and an outer layer body that accommodates the inner layer body inside, a preform for the container, And a method for manufacturing the container.

  As a container for storing cosmetics such as lotion, shampoo, rinse, liquid soap, various drugs, food seasonings, etc., the inner layer body having a filling space for the contents and the inner layer body are detachably stored. In addition, a double container is known which includes an outer layer body having an inlet for taking in outside air between the inner layer body and the inner layer body can be reduced in volume as the contents are poured out. (For example, refer to Patent Document 1). This type of container can pour out the contents without replacing the contents in the filling space with the outside air, and in particular stores the contents that may be deteriorated in quality due to contact with the outside air. It is suitable as a container to be used.

  In addition, as a method of manufacturing such a double container, for example, Patent Document 2 discloses an outer preform (outer layer piece A ′) having a bottomed cylindrical shape and an inner preform (fitting in the outer preform ( Each of the inner layer pieces B ′) is molded, the inner preform is fitted to the outer preform, heated to a temperature at which it can be stretched, and then blow molded while being stretched with a stretching pin.

JP 2011-136704 A Japanese Utility Model Publication No. 53-25856

  By the way, in such a double container, for example, when a discharge device having a pumping function and having a suction tube extending toward the bottom of the inner layer body is used and used, the inner layer body is extracted as the contents are poured out. In some cases, the bottom portion is lifted to the mouth side and closes the tip opening of the suction tube, making it difficult to dispense the contents. Further, the volume reduction of the inner layer body progresses unevenly and the body part is crushed so as to be constricted, and the middle part may be blocked while the contents remain below the body part. For this reason, even if the content is poured out and the inner layer is reduced in volume, the bottom of the inner layer can be prevented from being lifted, and the inner layer is reduced in volume evenly so that the content can be poured out without waste. There was a need for a new double container that could be used.

  An object of the present invention is to solve such a problem, and an object of the present invention is to surely prevent the bottom of the inner layer body from being lifted as the contents are poured out, and to reduce the inner layer body evenly. A new double container that can be accommodated is proposed.

The present invention is a double container comprising an inner layer body having a filling space for storing contents and enabling volume reduction of the filling space, and an outer layer body for storing the inner layer body inside,
The outer layer body has a through hole at the bottom thereof,
The inner layer body passes through the through-hole and is locked to the through-hole, and a plurality of claws for introducing outside air between the outer layer body and the inner layer body through a gap formed therebetween. Is a double container.

  The claw part preferably has a pressing part that tilts the claw part.

Further, the present invention provides a double container comprising an inner layer body having a filling space for storing contents and enabling the volume reduction of the filling space, and an outer layer body for storing the inner layer body on the inside. A preform,
The preform comprises an inner preform that forms the inner layer body and an outer preform that forms the outer layer body,
The outer preform has a through hole at the bottom thereof,
The inner preform passes through the through hole and is locked to the through hole, and a plurality of claws for introducing outside air between the outer layer body and the inner layer body through a gap formed therebetween. A preform having a part.

In forming a double container with the preform,
While inserting the inner preform into the outer preform, the claw portion is locked to the through hole,
Subsequently, it is preferable to perform biaxial stretch blow molding after heating the inner preform and the outer preform to a temperature at which they can be stretched.

  The double container is composed of a volume-reducible inner layer body and an outer layer body that accommodates the inner layer body inside, and a through hole is provided at the bottom of the outer layer body. Since the plurality of claw portions to be locked are provided, the bottom portion of the inner layer body is engaged and held by the outer layer body to prevent the inner layer body from being lifted to the mouth side, and the inner layer body can be evenly reduced in volume. . In addition, since outside air is introduced between the outer layer body and the inner layer body through a gap formed between these claw portions, volume reduction of the inner layer body is not hindered. Furthermore, since the gap between the claw portions and the claw portions is provided at the bottom of the container, the claw portions are hardly conspicuous and the appearance is not impaired.

  Moreover, when providing a press part in a nail | claw part, since an inner-layer body can be removed by pushing this press part and inclining a nail | claw part after pouring out the contents, separation disposal becomes easy.

  Further, such a double container is composed of an inner preform that forms an inner layer body and an outer preform that forms an outer layer body, and this inner container passes through a through-hole provided in the bottom of the outer preform. It is preferable to mold with a preform provided with a plurality of claws for engaging outside air between the outer layer body and the inner layer body through a gap formed between the through holes. In this case, the inner preform is inserted into the outer preform and the claw portion is locked in the through hole, and then the inner preform and the outer preform are heated to a temperature at which they can be stretched, and then biaxial stretch blow molding is performed. For example, the above-described double container can be easily formed.

(A) is a side view which shows the embodiment of the double container according to the present invention in a partial cross section (cross section along XX in FIG. 1 (b)), and the broken line part is a biaxial view of the double container It is a side view which shows the preform before stretch blow molding, Comprising: (b) is an arrow line view which follows the arrow A of (a). It is the side view which showed the state which poured out the content with the dispenser which is not shown about the double container of embodiment shown in FIG. 1, and the inner-layer body reduced the volume in partial cross section. (A) is a side view which shows other embodiment of the double container according to this invention in a partial cross section, and a broken line part is a side view which shows the preform before biaxial stretch blow molding of this double container. And (b) is an arrow line view which follows the arrow B of (a). FIG. 4 is a side view of the double container of another embodiment shown in FIG. 3 with a partial cross-sectional view showing a state in which after the contents are poured out, the pressing part of the nail part is pushed with a finger to release the engagement of the nail part is there. It is the side view which showed the state which takes out an inner layer body from the state shown in FIG. 4 in the partial cross section. (A) is the side view which showed the inner side preform which forms an inner layer body in the cross section about the preform of the double container shown in FIG. 1, (b) is the arrow which follows the arrow C of (a) FIG. It is the side view which showed the outer side preform which forms an outer layer body in the partial cross section about the preform of the double container shown in FIG. It is the side view which showed the state which combined the inner preform shown in FIG. 6, and the outer preform shown in FIG. 7 in the partial cross section. (A) is the side view which showed the inner side preform which forms an inner layer body in the cross section about the preform of the double container shown in FIG. 3, (b) is an arrow along arrow D of (a) FIG.

Hereinafter, the present invention will be described more specifically with reference to the drawings.
Fig.1 (a) is a side view which shows the embodiment of the double container according to this invention in a partial cross section (cross section along XX of FIG.1 (b)), and a broken line part is this double container. It is a side view which shows the preform before biaxial stretch blow molding, Comprising: FIG.1 (b) is an arrow line view which follows the arrow A of (a). Moreover, FIG. 2 is the side view which showed the state which poured out the content with the dispenser which is not shown about the double container of embodiment shown in FIG. 1, and the inner-layer body reduced the volume in partial cross section.

  In FIG. 1 (a), 1A is a double container according to the present invention. The double container 1A has a filling space M for storing contents inside thereof, an inner layer body 10A capable of reducing the volume of the filling space M, and an outer layer body 20 for storing the inner layer body 10A on the inner side. I have. In addition, the broken line part shown in FIG. 1 has shown preform 2A which shape | molds double container 1A with the manufacturing method mentioned later.

  The inner layer body 10A and the outer layer body 20 can be separated from each other in order to reduce only the inner layer body 10A. In this embodiment, the inner layer body 10A is made of PP (polypropylene), and the outer layer body 20 is It is made of PET (polyethylene terephthalate). The material of the inner layer body 10A and the outer layer body 20 may be the same material or different materials as long as they can be peeled, and can be appropriately selected from PE (polyethylene), PA (polyamide) and the like.

  In this embodiment, the inner layer body 10 </ b> A includes a cylindrical mouth portion 11, a cylindrical trunk portion 13 that is connected to the mouth portion 11 via a shoulder portion 12 and has a larger diameter than the mouth portion 11, and A bottom portion 14 that closes the lower end portion is provided, and an inner space defined by the mouth portion 11, the shoulder portion 12, the trunk portion 13, and the bottom portion 14 is defined as a filling space M. Further, an annular folded portion 15 is provided at the upper end portion of the mouth portion 11 so as to be folded toward the radially outer side. A plurality of claw portions 16 are provided at the center of the bottom portion 14 so as to protrude to the opposite side with respect to the mouth portion 11. In the present embodiment, as shown in FIG. 1B, three are provided in an equal arrangement, and a gap 17 is formed between these claw portions 16.

  The outer layer body 20 surrounds the mouth part 11 and has a mouth part 21 provided with a screw part on the outer peripheral surface thereof, a cylindrical body part 23 connected to the mouth part 21 via a shoulder part 22 and surrounding the body part 13, And a bottom portion 24 that houses the bottom portion 14 inside and closes the lower end portion of the body portion 23. An annular wall 25 that engages with the folded portion 15 is provided at the upper portion of the mouth portion 21. A through hole 26 is provided at the center of the bottom 24. The through-hole 26 allows the claw portion 16 to be inserted from the inside toward the outside and can be locked to the end portion thereof. The gap 17 between the adjacent claw portions 16 functions as an inlet for introducing outside air between the inner layer body 10A and the outer layer body 20 as shown in FIG. As shown in FIG. 1A, the bottom portion 24 is inclined upward inward in the radial direction to a position where the claw portion 16 does not protrude outward from the outer edge portion of the bottom portion 24. The nail | claw part 16 does not become obstructive in the state which stood the container 1A.

  Although not shown in the figure, the double container 1A configured as described above has, for example, a discharge device that can discharge the contents in the filling space M by driving the pump by repeating the pushing operation of the head. It is used by being fixedly held on the part 21. Then, as the contents in the filling space M are poured out, the volume of the inner layer body 10A is reduced as shown in FIG. 2, but the bottom portion 14 of the inner layer body 10A has the claw portion 16 of the outer layer body 20. Since it is latched by the through-hole 26, the lifting toward the mouth side can be prevented. Further, the inner layer body 10 has the folded portion 15 engaged with the annular wall 25 and the tip of the mouth portion 11 is also locked, and the body portion 13 is directed toward the central axis of the double container 1 as the contents are poured out. Since the whole shrinks evenly, the contents are not left behind. In addition, since external air is introduced through the gap 17 between the inner layer body 10A and the outer layer body 20, the inner layer body 10A is reduced in volume as the contents in the filling space M are poured, while the outer layer body 20 The shape of is maintained as it is.

  Further, for example, if a pressurizing device that can introduce pressurized air between the inner layer body 10 </ b> A and the outer layer body 20 through the gap 17, the contents are continuously displayed while the head of the above-described ejector is being pushed down. Things can also be dispensed. In this case, as a discharger, for example, a function of a check valve that allows the filling space M to communicate with the outside world by pressing down the head or checking the lever is provided, while the pump function is Omitted ones can be used.

  Moreover, the double container according to the present invention may be another embodiment shown in FIGS. 3 (a) and 3 (b). In addition, the same code | symbol is attached | subjected to the site | part which has a function common to the site | part shown in FIGS. 1-2 mentioned above, and description is abbreviate | omitted.

  The double container 1B shown in FIG. 3 (a) is a pressing part 18 that extends the tip of the claw part 16, and the claw part 16 is equally arranged as shown in FIG. 3 (b). One is provided.

  As shown in FIG. 4, the double container 1 </ b> B configured as described above releases the engagement between the claw portion 16 and the through hole 26 by pressing the pressing portion 18 and tilting the claw portion 16 inward. be able to. As a result, the inner layer body 10B can be removed from the mouth portion 21 as shown in FIG.

  Next, the manufacturing method of the double container according to the present invention will be described in accordance with the above-described double container 1A. In manufacturing the double container 1A, as shown in FIGS. 6 to 8, a preform 2A comprising an inner preform 30A for forming the inner layer body 10A and an outer preform 40 for forming the outer layer body 20 is prepared. To do. The inner preform 30A and the outer preform 40 are formed by, for example, injection molding.

  Here, the inner preform 30A of the present embodiment has a bottomed cylindrical shape having a mouth portion 31 as shown in FIG. 6A, and the upper end portion of the mouth portion 31 is directed radially outward. A folded-back folded portion 32 is provided. A claw portion 33 is provided at the bottom of the inner preform 30 </ b> A so as to protrude to the opposite side with respect to the mouth portion 31. In the present embodiment, as shown in FIG. 6B, three are provided in an equal arrangement, and a gap 34 is formed between these claw portions 33.

  Further, as shown in FIG. 7, the outer preform 40 has a bottomed cylindrical shape having a mouth portion 41 having a threaded portion formed on the outer peripheral surface thereof. Further, an annular wall 42 that engages with the folded portion 32 is provided at the upper portion of the mouth portion 41. In the present embodiment, the bottom portion of the outer preform 40 after molding has a shape in which the center portion protrudes on the opposite side of the mouth portion 41 and is closed, but it is shown in FIG. 8 by cutting along the line c. Thus, the through hole 43 is formed. In addition, you may shape | mold the outer preform 40 by the metal mold | die structure in which the through-hole 43 is formed from the beginning.

  Then, as shown in FIG. 8, the inner preform 30A is inserted into the outer preform 40 and pushed to the end so that the claw portion 33 is locked to the through hole 43, and the folded portion 32 is locked to the annular wall 42. Thus, a preform 2A for a double container is formed.

  Next, the preform 2A is heated to a temperature at which it can be stretched, set in a blow molding die, and then biaxially stretched blow molding is performed. In the present embodiment, although not shown in the drawings, a stretching rod that is inserted through the mouth portion 31 and protrudes from the bottom of the inner preform 30A, and is disposed to face the stretching rod. And a receiving rod provided so as to come into contact with the bottom and retreat in response to the extension rod protruding. And double container 1A is shape | molded by sending the air of predetermined pressure into the inner side preform 30A from the opening part 31, and retreating a receiving rod, protruding an extending | stretching rod. Note that the mouth portion 31 of the inner preform 30A is not detached from the outer preform 40 during stretch blow molding because the folded portion 32 is locked to the annular wall 42.

  Thus, if biaxial stretching blow molding is performed using the preform 2A composed of the inner preform 30A having the claw 33 and the outer preform 40 having the through-hole 43, the same biaxial stretching as in a normal container is performed. The double container 1A can be manufactured by blow molding.

  In manufacturing the double container 1B according to another embodiment, instead of the above-described inner preform 30A, as shown in FIGS. An inner preform 30B having two formed claw portions 33 in an equal arrangement is prepared, and the inner preform 30B is biaxially stretched by a preform 2B in combination with the outer preform 40 in the same manner as the preform 2A described above. Blow molding may be performed.

  According to the present invention, it is possible to reliably prevent the bottom of the inner layer body from being lifted with the content being poured out, so that even when a dispenser having a suction tube is provided, the pouring is not hindered, and the inner layer body It is possible to reduce the volume evenly, so that the contents can be dispensed without waste to the end, and a double container that can be easily manufactured by the same biaxial stretch blow molding as before Can be provided.

DESCRIPTION OF SYMBOLS 1A Double container 1B Double container 2A Preform 2B Preform 10A Inner layer body 10B Inner layer body 16 Claw part 17 Crevice 18 Press part 20 Outer layer body 26 Through-hole 30A Inner preform 30B Inner preform 33 Claw part 34 Gap 35 Press part 40 Outer preform 43 Through hole M Filling space

Claims (4)

A double container comprising an inner layer body having a filling space for storing the contents and enabling volume reduction of the filling space, and an outer layer body for storing the inner layer body inside;
The outer layer body has a through hole at the bottom thereof,
The inner layer body passes through the through-hole and is locked to the through-hole, and a plurality of claws for introducing outside air between the outer layer body and the inner layer body through a gap formed therebetween. Having a double container.   The double container according to claim 1, wherein the claw portion has a pressing portion that tilts the claw portion. A preform for molding a double container comprising an inner layer body having a filling space for storing contents and enabling volume reduction of the filling space, and an outer layer body for storing the inner layer body on the inside. ,
The preform comprises an inner preform that forms the inner layer body and an outer preform that forms the outer layer body,
The outer preform has a through hole at the bottom thereof,
The inner preform passes through the through hole and is locked to the through hole, and a plurality of claws for introducing outside air between the outer layer body and the inner layer body through a gap formed therebetween. A preform having a part. In forming a double container with the preform according to claim 3,
While inserting the inner preform into the outer preform, the claw portion is locked to the through hole,
Then, after heating this inner preform and this outer preform to the temperature which can be extended | stretched, the manufacturing method of the double container which performs biaxial stretch blow molding.

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