JP7139064B2 - double container - Google Patents

Description

TECHNICAL FIELD The present invention relates to a double container in which a volume-reducing and deformable inner layer is housed in an outer layer.

Conventionally, as a container for storing foods such as seasonings, for example, a volume-reducing and deformable inner layer body having a space for storing the contents, and a bottle-shaped body having a mouth portion, a body portion, and a bottom portion are used to store the inner layer body. A double container made of synthetic resin is known that has an outer layer body and an outside air introduction port that is provided in the outer layer body and introduces outside air between the outer layer body and the inner layer body (see, for example, Patent Document 1). .

According to the double container having the above structure, only the inner layer body can be reduced in volume and deformed without changing the shape of the outer layer body as the contents are discharged to the outside through the mouth. It is possible to suppress the introduction of outside air into the inner layer body after discharging the liquid, thereby suppressing the deterioration and deterioration of the contents accommodated in the container.

In such a double container, the outer layer body is made of a hard synthetic resin material such as high-density polyethylene, and the inner layer body is tilted with the mouth facing downward. A container is also known in which the contents contained in the container are naturally discharged to the outside through the mouth by its own weight.

Japanese Patent Application Laid-Open No. 2018-2232

As a double container as described above, there is known one in which an outside air introduction port is provided in the form of a slit at the bottom of the outer layer body.

However, in the case where the outside air inlet is provided at the bottom of the outer layer body, after a certain amount of content is discharged, it is stored in a refrigerator or the like to be cooled, and then left at room temperature, the slit-shaped outside air is formed due to dew condensation or the like. There is a problem that the inlet is sealed, which increases the pressure of the air between the outer layer body and the inner layer body, and there is a risk that the contents will blow out when the cap is opened.

On the other hand, it is conceivable to provide the outside air introduction port in the mouth portion of the outer layer body. However, in such a configuration, when the outer layer body is made of a hard synthetic resin, when the contents are discharged with the mouth part facing downward, the weight of the contents itself causes the inner layer body to be pushed out of the mouth. There is a possibility that the outside air introduction port will be blocked by being pressed against the inner surface of the part, making it difficult to discharge the contents.

In addition, when the outside air inlet is provided in the body of the outer layer body, shower water in the cooling process after hot filling of the contents in the container, steam when attaching the shrink label to the body, etc. There is a possibility that the problem of entering between the outer layer body and the inner layer body from the introduction port may occur.

The present invention has been made in view of such problems, and its object is to enable the content to be easily ejected from the mouth portion by its own weight and to prevent unintended ejection of the content due to changes in the ambient temperature. It is to provide a double container that can be

The double container of the present invention comprises a bottle-shaped outer layer body having a mouth portion, a body portion and a bottom portion; A synthetic resin double container having an outside air introduction port provided in the outer layer body and introducing outside air between the outer layer body and the inner layer body as the inner layer body is deformed to reduce the volume , The bottom portion is provided with the slit-shaped external air introduction port, and external air can be introduced between the outer layer and the inner layer through the opening of the outer layer by reducing the volume of the inner layer. First, there is a vent for communicating between the outer layer body and the inner layer body to the outside of the outer layer body so that when the air between the outer layer body and the inner layer body expands, the air is discharged to the outside. is provided.

In the double container of the present invention, in the above configuration, a fitting portion is provided on the lower end side of the mouth portion and into which the outer peripheral wall of the pouring cap is fitted, and a fitting portion is provided on the outer peripheral surface of the fitting portion to provide the ventilation. and at least one groove that communicates the mouth with the outside, and the total cross-sectional area of all the grooves is preferably 0.44 to 1.06 mm ² .

In the double container of the present invention, in the above configuration, it is preferable that the pair of concave grooves having the same cross-sectional area are arranged opposite to each other with the axial center of the mouth portion sandwiched therebetween.

In the double container of the present invention, in the configuration described above, the outer layer body and the inner layer body extend from the mouth portion to the bottom portion through the body portion, and the outer layer body and the inner layer body are adhered to each other. It is preferable that only one adhesive strip is provided, and the vent hole is provided at a position facing the adhesive strip across the axis of the outer layer body.

In the double container of the present invention, in the configuration described above, the outer layer body and the Preferably, ribs are provided to seal the mating portion with the inner layer body.

In the double container of the present invention, the outer layer is preferably made of high-density polyethylene in the above configuration.

ADVANTAGE OF THE INVENTION According to this invention, the double container which can discharge a content easily from a mouth part by dead weight, and can prevent the unintended ejection of the content by the change of atmospheric temperature can be provided.

It is a front view of the double container which is one embodiment of the present invention. FIG. 2 is a right side view of the double container shown in FIG. 1; Fig. 2 is a left side view of the double container shown in Fig. 1; FIG. 2 is a plan view of the double container shown in FIG. 1; 2 is a bottom view of the double container shown in FIG. 1; FIG. Fig. 3 is a cross-sectional view of the spout cap attached to the spout; It is a front view of the double container of a modification. It is a bottom view of the double container of the modification shown in FIG.

Hereinafter, the present invention will be described more specifically by way of example with reference to the drawings.

A double container 1, which is one embodiment of the present invention shown in FIGS. It has a heavy structure.

In the present specification, claims and drawings, the vertical direction means the vertical direction when the double container 1 is in an upright position as shown in FIG. A direction along a straight line that passes through the axis O of the heavy container 1 and is perpendicular to the axis O is meant.

In the double container 1 of the present embodiment, a laminated parison obtained by radially laminating a synthetic resin material forming the outer layer body 10 and a synthetic resin material forming the inner layer body 20 is sandwiched between metal molds, and air is introduced into the interior of the parison. It is formed by extrusion blow molding (EBM: Extrusion Blow Molding) in which a container is formed by blowing.

The outer layer body 10 is a portion constituting the outer shell of the double container 1 and has a bottle shape having a mouth portion 11 , a body portion 12 and a bottom portion 13 .

The mouth portion 11 is cylindrical, and a male thread 11a is integrally provided on the outer peripheral surface thereof. A spout cap 30 (see FIG. 6) can be attached to the spout 11 by screwing it onto the male thread 11a. The configuration of the spout cap 30 will be described later.

The mouth portion 11 may be provided with an annular protrusion instead of the male thread 11a, and the pouring cap 30 may be attached to the protrusion in an undercut manner by plugging. In this case, the mouth portion 11 is not limited to a cylindrical shape, and may have, for example, a square tube shape or an elliptical tube shape as long as it is cylindrical.

A lower end portion of the mouth portion 11 forms an annular fitting portion 11b having a larger diameter than the portion where the male screw 11a is provided. The outer peripheral surface of the fitting portion 11b is provided with grooves 11c that vertically cross the fitting portion 11b at two locations facing each other across the axis of the mouth portion 11 (the axis O of the double container 1). It is The pair of concave grooves 11c facing each other across the axis of the mouth portion 11 have the same shape and the same cross-sectional area (an area in a cross section perpendicular to the axial direction). Also, the total cross-sectional area of the pair of recessed grooves 11c is set to be within the range of 0.44 to 1.06 mm ² .

The body portion 12 is integrally connected to the lower end of the mouth portion 11, gradually expands downward in diameter, and protrudes radially outward with respect to the mouth portion 11. It has a substantially cylindrical trunk body portion 12b that is integrally connected to the lower end and has a slightly constricted portion.

The bottom portion 13 is integrally connected to the lower end of the body portion 12 and closes the lower end of the body portion 12 . The bottom portion 13 has an annular outer peripheral edge portion 13a and a concave portion 13b provided inside the outer peripheral edge portion 13a and recessed upward in a hemispherical shape. The container 1 can be arranged in an upright position.

In this embodiment, the outer layer body 10 is made of high-density polyethylene. The outer layer body 10 is made of a hard synthetic resin having a predetermined thickness so that the body portion 12 does not easily deform due to squeezing (pressing). That is, the double container 1 is not a squeeze type container in which the contents are discharged by squeezing the body portion 12 of the outer layer body 10, but the double container 1 is tilted so that the mouth portion 11 faces downward. As a result, the container is a natural discharge type container in which the contents are naturally discharged to the outside through the mouth portion 11 by its own weight.

In addition, after the double container 1 completes the discharge of the contents by its own weight (after the contents are not discharged even if the mouth part 11 is tilted downward), the outer layer body 10 The contents left after squeezing the barrel 12 can be discharged to the outside through the mouth 11. - 特許庁

The inner layer body 20 is composed of two or more layers (for example, "EVOH/adhesive resin/low-density polyethylene", etc.), the outer layer is formed in a thin bag shape thinner than the body portion 12 of the outer layer body 10, and the outer layer is peelably laminated on the entire inner surface of the outer layer body 10. Housed in body 10 . The interior of the inner layer body 20 is an accommodation space 21 for contents (content liquid), and can accommodate food such as food seasonings such as soy sauce as contents.

The open end 22 of the inner layer body 20 is arranged at the open end of the mouth portion 11 . As a result, the contents stored in the storage space 21 of the inner layer body 20 are naturally released to the outside through the mouth portion 11 by its own weight by tilting the double container 1 so that the mouth portion 11 faces downward. can be discharged to In addition, the inner layer body 20 is freely volume-reducing and deformable, and can be detached from the inner surface of the outer layer body 10 as the contents are discharged, and can be volume-reducing and deformed so as to reduce its internal volume. .

As shown in FIGS. 1 and 5, the bottom portion 13 of the outer layer body 10 is provided with a slit-shaped outside air introduction port 14 for introducing the outside air between the outer layer body 10 and the inner layer body 20 .

More specifically, at the bottom 13 of the outer layer body 10, the laminated parison extends along the parting line of the mold when the double container 1 is formed by extrusion blow molding. A pinch-off portion 15 is provided, and a portion where the outer layer body 10 and the inner layer body 20 are joined in the pinch-off portion 15 serves as a slit-shaped outside air introduction port 14 . A rib 16 is provided on one side of the pinch-off portion 15 in the longitudinal direction, and the joint portion of the outer layer body 10 and the inner layer body 20 is sealed at the portion where the rib 16 is provided.

By providing the slit-shaped outside air introduction port 14 in the bottom portion 13 of the outer layer body 10, the outside air can be introduced between the outer layer body 10 and the inner layer body 20 as the inner layer body 20 is deformed to reduce the volume. The inner layer body 20 can be easily volume-reduced and deformed inside the outer layer body 10 without generating a negative pressure between the outer layer body 10 and the inner layer body 20 . In addition, the inner layer body 20 is easily deformed to reduce the volume, so that the double container 1 is placed in a tilted posture, so that the content can be naturally and efficiently discharged to the outside through the mouth portion 11 by its own weight.

Further, as shown in FIGS. 2 and 4 , a vent 17 is provided in the mouth portion 11 of the outer layer body 10 . In addition, the vent 17 is provided above the fitting portion 11 b provided on the lower end side of the mouth portion 11 . The vent hole 17 is a through hole having a circular cross-section that penetrates the mouth portion 11 in the radial direction, and is open at a flat chamfered portion where a part of the outer peripheral surface of the mouth portion 11 is chamfered. The body 20 is communicated with the outside of the outer layer body 10, that is, with the outside air.

The double container 1 of the present embodiment having the above structure is preferably used with a spout cap 30 having a structure such as that shown in FIG.

The pouring cap 30 has a cap body 31 having a capped tubular shape, and a female thread 31b provided on the inner peripheral surface of a cylindrical outer peripheral wall 31a of the cap body 31 is threadedly coupled to the male thread 11a to form a mouth portion. 11 is installed. The top wall 31c of the cap body 31 is integrally provided with a discharge cylinder 31d for discharging the contents.

An inner plug 32 is attached between the cap body 31 and the mouth portion 11 . The inner plug 32 is integrally provided with a tubular portion 32a whose lower end opens toward the accommodation space 21 of the inner layer body 20 and whose upper end communicates with the discharge cylinder 31d. A valve 33 is arranged. The ball valve 33 functions as a check valve. A plurality of ribs 32c are provided on the inner peripheral surface of the tubular portion 32a at intervals in the circumferential direction between the open position where the tubular portion 32a moves upward from the seat portion 32b and communicates the tubular portion 32a with the housing space 21. It is movable along the When the ball valve 33 is in the open position, the contents of the housing space 21 can flow toward the discharge cylinder 31d through the plurality of ribs 32c inside the cylindrical portion 32a.

The cap body 31 is integrally provided with a topped cylindrical lid body 35 via a hinge 34 . The lid body 35 has a cylindrical plug member 35b integrally provided on the inner surface of the top wall 35a thereof. The discharge cylinder 31d is closed by fitting to the inner peripheral surface. A columnar projection 35c is provided inside the plug member 35b, so that even if the ball valve 33 is fixed to the upper end of the cylindrical portion 32a, the ball valve 33 remains columnar when the lid body 35 is closed. The fixing is canceled by being pushed by the projection 35c.

On the other hand, when the lid body 35 is opened around the hinge 34, the plug member 35b is separated from the discharge cylinder 31d, and the discharge cylinder 31d is opened so that the contents can be discharged. Therefore, by tilting the double container 1 with the lid 35 open, the content flowing out of the double container 1 by its own weight through the mouth portion 11 can be discharged to the outside from the discharge tube 31d. can be done.

The lower end portion of the outer peripheral wall 31a of the cap main body 31 is fitted in the fitting portion 11b provided on the lower end side of the mouth portion 11 at its inner peripheral surface. The space between the outer peripheral wall 31a and the mouth portion 11 is communicated with the outside by the groove 11c provided. That is, the space between the outer layer body 10 and the inner layer body 20 communicates with the outside through the vent 17 and the groove 11c.

In the double container 1 of the present embodiment having the above configuration, the outside air introduction port 14 is provided in the form of a slit in the bottom portion 13 of the outer layer body 10, so that the lid 35 of the pouring cap 30 is in the closed position. If the discharge tube 31d is closed and stored in a refrigerator or the like to be cooled and then left at room temperature, the slit-shaped outside air introduction port 14 may be sealed due to dew condensation or the like. However, in the double container 1 of the present embodiment, since the vent 17 is provided in the mouth portion 11, which is a portion other than the bottom portion 13 of the outer layer body 10, the slit-shaped outside air introduction port 14 is sealed due to dew condensation or the like. Even if it is, the space between the outer layer body 10 and the inner layer body 20 can be communicated with the outside (outside air) through the vent 17 . Therefore, even if the air between the outer layer body 10 and the inner layer body 20 is warmed by being left at room temperature after being stored in a refrigerator or the like and cooled, the air expanded by the warming will be removed from the vent hole 17. , and the air pressure between the outer layer body 10 and the inner layer body 20 is not increased. Therefore, it is possible to prevent the contents from unexpectedly ejecting from the discharge tube 31d when the cover 35 is opened.

On the other hand, when the double container 1 is tilted and the contents are naturally discharged from the mouth portion 11 by its own weight, the inner layer body 20 is pressed against the inner surface of the mouth portion 11 by the weight of the contents to allow ventilation. Although there is a risk that the opening 17 may be blocked, since the outside air introduction port 14 is provided in the bottom portion 13 of the outer layer body 10, air can flow between the outer layer body 10 and the inner layer body 20 due to the volume reduction deformation of the inner layer body 20. It is not difficult to discharge the contents due to hindrance to the introduction of outside air.

As described above, in the double container 1 of the present embodiment, the outer layer body 10 is made of a hard synthetic resin, and the double container 1 is tilted so that the contents are pushed out through the mouth portion 11 by its own weight. In the case of natural discharge, a slit-shaped external air introduction port 14 is provided in the bottom 13 of the outer layer body 10, and the opening 11 communicates between the outer layer body 10 and the inner layer body 20 to the outside of the outer layer body 10. Since the vent 17 is provided, the content can be easily discharged from the mouth portion 11 by its own weight, and unintended ejection of the content due to changes in the ambient temperature can be prevented.

In addition, in the double container 1 of the present embodiment, since the vent 17 is provided in the mouth portion 11, even when the contents are hot-filled into the storage space 21 of the double container 1, , it is possible to prevent the shower water from entering between the outer layer body 10 and the inner layer body 20 through the vent 17 when the double container 1 is sprayed with shower water to cool it. Even when a shrink label is attached, steam or the like can be prevented from entering between the outer layer body 10 and the inner layer body 20 through the vent 17 .

Furthermore, in the double container 1 of the present embodiment, the outer layer body 10 is made of high-density polyethylene, so the weight of the double container 1 is reduced while the outer layer body 10 is hard having a predetermined strength or rigidity. can be made

As shown in FIG. 3, the double container 1 of the present embodiment extends from the mouth portion 11 through the body portion 12 to the bottom portion 13 between the outer layer body 10 and the inner layer body 20, and extends between the outer layer body 10 and the inner layer body 20. It is also possible to have an adhesive band 40 that bonds the inner layer body 20 to each other. The adhesive band 40 may be made of an adhesive synthetic resin material such as an adhesive polyolefin.

By providing the adhesive band 40 between the outer layer body 10 and the inner layer body 20, the crushing of the inner layer body 20 due to the volume reduction deformation accompanying the ejection of the contents is regulated, and the adhesive remains inside the inner layer body 20. It is possible to reduce the amount of remaining contents that would be spoiled.

Here, in this embodiment, only one adhesive strip 40 is provided between the outer layer body 10 and the inner layer body 20 . In this case, the adhesive band 40 extends from the mouth portion 11 through the body portion 12 to the bottom portion 13 along the parting line in the extrusion blow molding of the double container 1 . The adhesive band 40 is provided on the side of the pinch-off portion 15 on which the rib 16 in the longitudinal direction is not provided. Further, the vent hole 17 is provided in the mouth portion 11 of the outer layer body 10 at a position facing the adhesive band 40 across the axis O of the outer layer body 10 , that is, the axis O of the double container 1 .

By adopting such a configuration, when the amount of contents accommodated in the accommodation space 21 of the inner layer body 20 is reduced, the inner layer body 20 at the mouth portion 11 is reduced in volume and deformed in the direction away from the air vent 17. As a result, communication between the outer layer body 10 and the inner layer body 20 can be reliably communicated with the outside through the vent hole 17 .

In addition, the rib 16 is provided on one side of the outside air introduction port 14 in the longitudinal direction, and the adhesive band 40 is provided on the other side of the outside air introduction port 14 in the longitudinal direction, so that the slit width of the outside air introduction port 14 is widened. can be prevented.

As described above, in the double container 1 of the present embodiment, in a state where the pouring cap 30 is attached to the mouth portion 11, the vent hole is opened through the pair of concave grooves 11c provided on the outer peripheral surface of the fitting portion 11b. 17 is communicated with the outside. The pair of recessed grooves 11c are provided circumferentially 90° apart from the adhesive band 40 and the air vent 17, respectively. In such a configuration, if the total cross-sectional area (total cross-sectional area) of the pair of recessed grooves 11c is too small, the air between the outer layer body 10 and the inner layer body 20 is warmed and expanded. As a result, a problem arises in that when the cover 35 of the pouring cap 30 is opened, the contents will be ejected. On the other hand, if the total cross-sectional area (total cross-sectional area) of the pair of recessed grooves 11c is too large, the body portion 12 of the outer layer body 10 is squeezed after the content is completely discharged by its own weight, and the remaining content is removed to the outside. , the air between the outer layer body 10 and the inner layer body 20 is not pressurized even if the body part 12 is squeezed, and as a result, the contents cannot be discharged, and the contents are not discharged. A problem arises in that the remaining amount of

Therefore, in the double container 1 of the present embodiment, in order to solve the above problems, in the configuration in which the vent 17 is communicated with the outside through a pair of grooves 11c provided on the outer peripheral surface of the fitting portion 11b, As described above, the total cross-sectional area (total cross-sectional area) of the pair of concave grooves 11c is set within the range of 0.44 to 1.06 mm ² . According to such a configuration, it is possible to reliably discharge the expanded portion of the air between the outer layer body 10 and the inner layer body 20 through the concave groove 11c to the outside due to the change in the ambient temperature of the air, so that unintended contents can be discharged. can be reliably suppressed. After the content has been discharged by its own weight, when the body portion 12 of the outer layer body 10 is squeezed to discharge the remaining content, the air between the outer layer body 10 and the inner layer body 20 flows into the groove 11c. Since it is possible to suppress excessive discharge through the container, the pressure of the air can be appropriately increased to maintain the squeezing dischargeability of the contents and reduce the remaining amount of the contents.

In order to confirm the effect obtained by setting the total cross-sectional area (total cross-sectional area) of the pair of concave grooves 11c within the range of 0.44 to 1.06 mm ² , the double container of the present embodiment Six types of double containers having the same configuration as 1 and having different total cross-sectional areas, which are the total cross-sectional areas of the pair of concave grooves 11c, by changing the depth of the pair of concave grooves 11c. Each double container was evaluated for the discharge property of the contents by squeezing the barrel and the self-jetting property of the contents. Here, the depths of the grooves of the double container are 0.3 mm, 0.5 mm, 1.0 mm, 1.2 mm, 1.6 mm, and 2.0 mm, and the grooves corresponding to the depth of each groove are The total cross-sectional areas of the grooves were 0.26 mm ² , 0.44 mm ² , 0.88 mm ² , 1.06 mm ² , 1.40 mm ² and 1.76 mm ² .

The self-jetting of the contents means that the air between the outer layer body 10 and the inner layer body 20 expands due to changes in the ambient temperature, and the contents are unintentionally ejected. If it is possible, it is judged that the self-jetting property is good.

In the ejection property evaluation, each double container was filled with 400 g of soy sauce as a content, and a pouring cap having the same configuration as the pouring cap 30 of the present embodiment was attached to the mouth portion. After the discharge of the contents was completed, the body of the outer layer body was squeezed to further discharge the contents. Then, when the content is no longer discharged by squeezing the barrel, the amount (weight) of the content remaining inside the inner layer body is measured, and if the remaining content is less than 5 g, the content is discharged. If the remaining amount is 5 g or more and less than 10 g, it is judged that the ejection property is normal and is evaluated as △. If the remaining amount is 10 g or more. was judged to be poor in dischargeability, and was evaluated as x.

In the evaluation of the self-jetting property, each double container was filled with soy sauce as a content, and a pouring cap having the same structure as the pouring cap 30 of the present embodiment was attached to the mouth. After that, it is cooled to 5°C, then transferred to a constant temperature bath with the outside air inlet configured as a bottom slit closed, heated to 40°C, and in this state, the lid of the pouring cap is opened. The presence or absence of self-injection was confirmed. When there was no self-jetting, it was judged that the self-jetting property was good and was evaluated as ◯.

In addition, when both the dischargeability and the self-jetting property are evaluated as ○, it is judged that the overall evaluation of the double container is good and is evaluated as ○, and either the dischargeability or the self-jetting property is evaluated as ○. If either one of them is evaluated as △, it is judged that the overall evaluation of the double container is normal, and it is evaluated as △, and at least one of the discharge property and the self-jetting property is evaluated as ×. In some cases, it was determined that the overall evaluation of the double container was unsatisfactory, and it was evaluated as x.

Table 1 summarizes the evaluation results.

From the results in Table 1, when the total cross-sectional area of the concave grooves was 0.44 to 1.06 mm ² , both the ejection property and the self-jetting property were good, that is, the overall evaluation of the double container was good, and the contents were squeezed. It was confirmed that it is possible to prevent unintended self-ejection of the contents due to changes in the ambient temperature while reducing the amount of the remaining contents by increasing the dischargeability of the contents.

FIG. 7 is a front view of a modified double container, and FIG. 8 is a bottom view of the modified double container shown in FIG. 7 and 8, the members described above are given the same reference numerals.

In the double container 100 of the modified example shown in FIGS. and the vent hole 17 provided in the mouth portion 11 is disposed at a position facing the adhesive band 40 with the axis O of the outer layer body 10 interposed therebetween. The rib 16 provided in the pinch-off portion 15 of 13 is provided between the end portion of the adhesive band 40 on the bottom portion 13 side and the longitudinal end portion of the external air inlet 14 on the adhesive band 40 side. That is, in the double container 100 of the modified example shown in FIGS. 7 and 8, the rib 16 is provided on the side of the adhesive band 40 in plan view with respect to the slit-shaped outside air inlet 14 .

In the case of a double container, after forming a double container of a predetermined shape by extrusion blow molding or the like, the inner layer that is in close contact with the inner surface of the outer layer is peeled off from the outer layer and laminated again on the inner surface of the outer layer. A peeling treatment is generally applied. By subjecting the molded double-layered container to an initial peeling treatment, it becomes easier to secure an airway between the outer layer and the inner layer, and the peelability of the inner layer from the outer layer when pouring out the contents is improved. can be enhanced.

Here, as in the double containers 1 and 100 of the present embodiment, the initial peeling treatment method for the configuration in which the bottom portion 13 is provided with the slit-shaped outside air introduction port 14 and the mouth portion 11 is provided with the vent hole 17 For example, there are various methods such as a method of pushing and breaking the bottom portion 13 and a method of introducing a pressurized medium such as pressurized air between the outer layer body 10 and the inner layer body 20 through the vent 17 provided in the mouth portion 11. method can be adopted, but in view of the fact that it is necessary to secure an airway not only in the portion where the outside air introduction port 14 is provided but also in the portion where the outside air introduction port 14 is provided, the initial peeling process is performed at the opening 11 It is preferable to introduce a pressurized medium between the outer layer body 10 and the inner layer body 20 through a vent hole 17 provided in the inner layer body.

However, like the double container 1 shown in FIGS. 1 to 5, the inner layer body 20 is held by the outer layer body 10 by the ribs 16 on one side in the longitudinal direction of the outside air introduction port 14, and the longitudinal direction of the outside air introduction port 14 is In the configuration in which the outer layer body 10 is held by the adhesive band 40 on the other side, even if a pressurizing medium is introduced from the vent hole 17, the peeling of the inner layer body 20 from the outer layer body 10 at the bottom portion 13 is caused by the rib 16 and the adhesive band. 40 prevents the inner layer body 20 from peeling off from the outer layer body 10 at the portion of the air inlet 14 located between the rib 16 of the bottom portion 13 and the adhesive band 40 . Since the ribs 16 are also used for alignment in the initial peeling process, they are also difficult to remove.

On the other hand, in the double container 100 of the modified example, a rib 16 is provided between the end of the adhesive band 40 on the bottom 13 side and the longitudinal end of the external air inlet 14 on the adhesive band 40 side, Since the ribs 16 are not provided in the portion of the bottom portion 13 on the side of the ventilation port 17 from the outside air introduction port 14 in plan view, the inner layer body 20 is not provided with the ribs 16 and the adhesive in the portion of the bottom portion 13 at the outside air introduction port 14 . It can be peeled off from the side where the vent 17 is provided in plan view where the band 40 is not provided. Therefore, the inner layer body 20 at the portion of the bottom portion 13 where the outside air inlet 14 is provided can be reliably separated from the outer layer body 10 .

In the double container 100 of the modified example described above, since both the rib 16 and the adhesive band 40 are provided on one side in the longitudinal direction of the outside air inlet 14, the rib 16 and the adhesive band 40 are not provided on the other longitudinal side. , the slit width of the outside air introduction port 14 expands to the thickening portion 50, and there is a possibility that the discharge performance is lowered. In such a case, by molding the laminated parison to have a small diameter in extrusion blow molding, the thickened portions 50 generated on both sides of the pinch-off portion 15 of the bottom portion 13 are brought closer to each other, thereby increasing the longitudinal direction of the outside air introduction port 14. By shortening the length, it is possible to prevent deterioration of ejection performance.

It goes without saying that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

For example, in the above embodiment, the double container 1 is configured as a delaminated container in which the inner layer 20 is detachably laminated on the inner surface of the outer layer 10, but the inner layer 20 is not limited to this. Alternatively, an inner layer formed separately from the outer layer may be incorporated.

In addition, in the above-described embodiment, the vent 17 is provided in the mouth 11 of the outer layer body 10. However, it is not limited to this. You may make it provide in various parts, such as providing. Further, the number of vent holes 17 is not limited to one, and a plurality of vent holes 17 may be provided in the mouth portion 11 or other parts.

Furthermore, in the above embodiment, the outer layer body 10 is made of high-density polyethylene, but it is not limited to this, and may be made of other synthetic resin such as polypropylene or low-density polyethylene.

Furthermore, in the above-described embodiment, only one adhesive strip 40 is provided between the outer layer body 10 and the inner layer body 20, but a plurality of adhesive strips 40 are provided between the outer layer body 10 and the inner layer body 20. may be provided, or the adhesive band 40 may not be provided between the outer layer body 10 and the inner layer body 20 .

Furthermore, the pouring cap 30 attached to the mouth portion 11 of the double container 1 is not limited to the one having the above configuration, and the double container 1 is placed in a tilted posture so that the contents can be poured through the mouth portion 11 by its own weight to the outside. Various constructions can be adopted as long as they can be discharged naturally.

Furthermore, in the above-described embodiment, the lower end portion of the outer peripheral wall 31a of the cap body 31 is fitted into the fitting portion 11b provided on the lower end side of the mouth portion 11, and the outer peripheral surface of the fitting portion 11b is provided with a Although the vent 17 is communicated with the outside through the concave groove 11c, for example, the lower end portion of the outer peripheral wall 31a of the cap body 31 is not fitted to the fitting portion 11b of the mouth portion 11. For example, without providing the fitting portion 11b and the concave groove 11c, the vent 17 provided in the outer layer body 10 can be configured to communicate with the outside.

1 double container 10 outer layer body 11 mouth portion 11a male screw 11b fitting portion 11c concave groove 12 body portion 12a shoulder-like portion 12b body portion 13 bottom portion 13a outer peripheral edge portion 13b recess 14 outside air inlet 15 pinch-off portion 16 rib 17 vent 20 inner layer body 21 housing space 22 opening end 30 pouring cap 31 cap main body 31a outer peripheral wall 31b female thread 31c top wall 31d discharge tube 32 inner plug 32a cylindrical portion 32b valve seat portion 32c rib 33 ball valve 34 hinge 35 lid body 35a top Wall 35b Plug member 35c Columnar projection 40 Adhesive band 50 Meat pool 100 Double container O Axis

Claims (6)

a bottle-shaped outer layer body having a mouth, a body and a bottom;
a volume-reducing and deformable inner layer body that has a space for accommodating contents and is housed in the outer layer body;
A synthetic resin double container having an outside air introduction port provided in the outer layer body and introducing outside air between the outer layer body and the inner layer body as the inner layer body is deformed to reduce the volume ,
The slit-shaped outside air introduction port is provided at the bottom,
Due to the volume-reducing deformation of the inner layer, outside air was not introduced into the opening between the outer layer and the inner layer, and the air between the outer layer and the inner layer expanded. A double-layered container, characterized in that it is provided with a vent port for communicating between the outer layer body and the inner layer body to the outside of the outer layer body so as to occasionally discharge the air to the outside . an annular fitting portion provided on the lower end side of the mouth portion and into which the outer peripheral wall of the pouring cap is fitted;
at least one recessed groove provided on the outer peripheral surface of the fitting portion and communicating the vent with the outside;
2. The double container according to claim 1 , wherein the total cross-sectional area of all said concave grooves is 0.44-1.06 mm2. 3. The double container according to claim 2 , wherein a pair of said concave grooves having the same cross-sectional area are arranged opposite to each other across the axis of said mouth. Only one adhesive band is provided between the outer layer body and the inner layer body, extending from the mouth portion to the bottom portion through the body portion and bonding the outer layer body and the inner layer body to each other,
4. The double container according to any one of claims 1 to 3 , wherein said vent is provided at a position facing said adhesive strip across the axis of said outer layer body. A rib is provided between the end of the adhesive band on the bottom side and the longitudinal end of the external air inlet on the adhesive band side for sealing the mating portion of the outer layer body and the inner layer body. 5. The double container of claim 4 , wherein the double container is A double container according to any one of claims 1 to 5 , wherein the outer layer body is made of high density polyethylene.

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