JP7317450B2 - 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 soy sauce and seasonings, for example, an inner layer body having a volume-reducing and deformable inner layer body having a space for storing the contents, and a bottle-shaped inner layer body having a mouth, a body and a bottom are provided. and an outside air introduction port provided in the outer layer body for introducing outside air between the outer layer body and the inner layer body (for example, Patent Document 1 reference).

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 a double container having a configuration in which a slit-shaped outside air introduction port is provided at the bottom of the outer layer body, for example, 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. Moisture such as condensation sometimes seals the slit-shaped outside air inlet, and as the air between the outer layer and the inner layer warms up, the pressure inside the container increases, and when the cap is opened, the pressure causes the contents to leak out. There was a problem that there was a possibility that an object might blow out to the outside.

In order to solve such a problem, the double container has a slit-shaped outside air introduction port provided at the bottom, and a vent hole that penetrates the mouth portion in the radial direction. It is conceivable to solve the above problem by discharging the air between the outer layer body and the inner layer body to the outside through the vent even if the outer air inlet is sealed due to moisture such as dew condensation. Further, in this case, the inner layer body is easily separated from the outer layer body at the portion where the vent hole is provided, and the vent path is reliably formed between the inner layer body and the outer layer body at the portion where the vent hole is provided. In order to do so, it is conceivable to make the region above the ventilation port of the male screw provided in the mouth part an intermittent portion where the male screw is not provided.

However, when the double container is molded by extrusion blow molding (EBM), a plug is inserted into the mouth from above, and the inner peripheral surface and upper end of the mouth are formed by this plug. Blow molding is generally performed by supplying a pressurized medium into the parison through a supply hole provided in the axial center of the plug while molding it into a predetermined shape. In a configuration in which the region is an intermittent portion, the surplus resin pushed down by the plug inserted into the opening reaches the portion where the vent is provided through the intermittent portion, thereby increasing the wall thickness around the vent. As a result, there is a risk of problems such as deterioration in the workability of drilling when forming a vent and deterioration in the peelability of the inner layer body from the outer layer body.

The present invention has been made in view of such problems, and its object is to be able to prevent unintended ejection of contents and to prevent an increase in wall thickness around vent holes in extrusion blow molding. To provide a self-weight discharge type double container.

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 a slit-shaped outside air introduction port provided in the bottom of the outer layer body and introducing outside air between the outer layer body and the inner layer body, wherein the opening of the opening a male screw integrally provided on an outer peripheral surface; and a vent provided in the opening for communicating between the outer layer body and the inner layer body to the outside of the outer layer body, wherein the male thread a continuous threaded portion extending continuously from one side to the other side in the circumferential direction of the mouth with respect to the vent on the upper side of the vent; , characterized in that it has an intermittent portion .

In the double container of the present invention, the outer peripheral surface of the mouth portion is provided with a flat portion perpendicular to the radial direction of the mouth portion, and the air vent opens into the flat portion. is preferably arranged in the intermittent portion.

In the double container of the present invention, in the configuration described above, the outer layer body has parting lines extending from the mouth portion to the bottom portion via the body portion on both sides across the axis of the outer layer body. , it is preferable that the vent is provided on the parting line.

In the double container of the present invention, in the above configuration, 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, and an annular fitting portion provided on the outer peripheral surface of the fitting portion, and at least one concave groove communicating the vent with the outside.

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.

According to the present invention, there is provided a self-weight discharge type double container capable of preventing unintended ejection of contents and preventing an increase in wall thickness around a vent in extrusion blow molding. can be done.

It is a front view of the double container which is one embodiment of the present invention. 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. 2 is an enlarged view of the mouth shown in FIG. 1; FIG. 6 is an enlarged view of area A in FIG. 5; FIG. Fig. 3 is a cross-sectional view of the spout with the spout cap attached;

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

A double container 1, which is an 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, and a circumferential direction means a direction around the axis O.

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 14 is integrally provided on the outer peripheral surface thereof. A spout cap 30 (see FIG. 7) can be attached to the spout 11 by threading it onto the male thread 14 . Details of the external thread 14 and the spout cap 30 will be described later.

A lower end portion of the mouth portion 11 is provided with an annular fitting portion 11a having a larger diameter than the portion where the male screw 14 is provided. The outer peripheral surface of the fitting portion 11a is provided with grooves 15 that vertically cross the fitting portion 11a 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 15 facing each other across the axis of the mouth portion 11 has the same shape and the same cross-sectional area (an area in a cross section perpendicular to the axial direction).

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 a synthetic resin containing high density polyethylene (HDPE) as a main component. More specifically, the outer layer body 10 has a laminated structure in which linear low-density polyethylene (L-LDPE)/high-density polyethylene/polypropylene (PP) are laminated from the outside to the inside of the container. The outer layer body 10 is formed with a predetermined thickness, and is made of a hard synthetic resin having sufficient strength or rigidity to prevent the trunk section 12 from being easily deformed by 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.

By making the outer layer body 10 of a synthetic resin containing high-density polyethylene as a main component, the outer layer body 10 is made hard and has a predetermined strength or rigidity suitable for the natural discharge type double container 1. , After the content has been discharged by its own weight (after the content is not discharged even if the mouth portion 11 is tilted downward), the remaining content is discharged to the outside through the mouth portion 11. A structure having elasticity or resilience that enables squeezing of the body portion 12 to the extent that discharge is possible can be achieved, and the weight of the double container 1 can be reduced.
can.

The inner layer body 20 is formed in the shape of a thin bag having a thickness thinner than that of the body portion 12 of the outer layer body 10, and is housed in the outer layer body 10 in a state of being detachably laminated on the entire inner surface of the outer layer body 10.例文帳に追加The interior of the inner layer body 20 is an accommodation space 21 for contents (content liquid), and can accommodate, for example, liquid seasoning such as soy sauce as the 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-reduced 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-reduced and deformed so as to reduce its internal volume.

As the inner layer body 20, for example, a layer composed of a synthetic resin material having good oxygen barrier properties such as nylon or EVOH resin (ethylene-vinyl alcohol copolymer), and a synthetic resin such as low-density polyethylene (olefin-based). Two or more layers (for example, "EVOH/adhesive resin/low-density polyethylene", etc.) having a layer composed of materials can be adopted, but other various synthetic resin materials and configurations can be used. can also be adopted.

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 can be formed by extrusion blow molding (EBM) in which a container is formed by blowing. In this case, when extrusion blow molding the double container 1, a plug is inserted into the opening 11 from above, and the plug forms the inner peripheral surface and upper end portion of the opening 11 into a predetermined shape. Blow molding is performed by supplying a pressurized medium into the laminated parison through a supply hole provided in the axial center of the plug. After the inner peripheral surface and upper end portion of the mouth portion 11 are molded by the plug, the laminated parison is cut off at a predetermined position by being sandwiched between the mold and the plug. By such a method, the mouth portion 11 can be accurately formed into a predetermined shape by extrusion blow molding without cutting or the like.

As shown in FIG. 6, a moil-cut portion M is integrally formed on the outer peripheral surface of the mouth portion 11 by cutting off the laminated parison sandwiched between the mold and the plug. The moil cut portion M has a triangular cross-sectional shape whose upper end is formed on a plane perpendicular to the axis O and whose downward facing surface is a tapered surface inclined at an angle of about 30 to 50 degrees with respect to the axis O. , and has an annular shape extending over the entire circumference of the mouth portion 11 .

As shown in FIGS. 2 and 4 , the bottom portion 13 of the outer layer body 10 is provided with a slit-shaped outside air introduction port 16 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, when the double container 1 is formed by extrusion blow molding, the layered parison is eaten away by the bottom side of the mold, resulting in parting of the mold. A pinch-off portion 17 extending along the line is provided, and a slit-shaped external air introduction port 16 is formed at a portion of the pinch-off portion 17 where the outer layer body 10 and the inner layer body 20 are joined. A rib 18 is provided on one side of the pinch-off portion 17 in the longitudinal direction, and the joining portion of the outer layer body 10 and the inner layer body 20 is sealed at the portion where the rib 18 is provided.

By providing the slit-shaped outside air introduction port 16 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 in a tilted posture, so that the contents can be naturally and efficiently discharged to the outside through the mouth portion 11 by its own weight.

A vent 19 is provided in the mouth portion 11 of the outer layer body 10 . In this embodiment, the vent 19 is provided above the fitting portion 11a and below the male thread 14 of the mouth portion 11 . The vent hole 19 is a through hole having a circular cross section that penetrates the mouth portion 11 of the outer layer body 10 in the radial direction, and communicates between the outer layer body 10 and the inner layer body 20 with the outside of the outer layer body 10, that is, with the outside air. there is

Note that the arrangement and shape of the vent 19 can be changed in various ways.

In this embodiment, a flat plane portion 11b perpendicular to the radial direction of the mouth portion 11 is provided on the outer peripheral surface of the mouth portion 11, and the vent hole 19 is opened to the plane portion 11b.

Alternatively, the vent hole 19 may be opened in the outer peripheral surface of the mouth portion 11 without providing the flat portion 11 b on the outer peripheral surface of the mouth portion 11 .

As shown in FIG. 5 , the male thread 14 integrally provided on the outer peripheral surface of the mouth portion 11 is attached to the vent hole 19 in the circumferential direction of the mouth portion 11 (about the axis O) on the upper side of the vent hole 19 . It has a continuous threaded portion 14a that continuously extends from one side to the other side in the circumferential direction. That is, a continuous threaded portion 14a of the male thread 14 is provided in a region of the mouth portion 11 above the vent hole 19 . The continuous threaded portion 14a extends in the circumferential direction with a length longer than at least the width of the vent 19 in the circumferential direction.

In the present embodiment, the male screw 14 extends spirally along the outer peripheral surface of the mouth portion 11 with a length that has a second turn, and extends spirally downward from the portion of the continuous screw portion 14a. The extended second winding portion is provided with an intermittent portion 14b positioned below the continuous threaded portion 14a. The intermittent portion 14b is a portion where the spirally extending male thread 14 is partially notched and the male thread 14 is not provided, and the male thread 14 is divided in the circumferential direction at the intermittent portion 14b. That is, the region of the male screw 14 directly above the vent hole 19 is the intermittent portion 14b, and the continuous thread portion 14a is provided in the region directly above the intermittent portion 14b. A pair of end faces 14c of the male screw 14 sandwiching the intermittent portion 14b are flat surfaces parallel to the plane portion 11b.

In this way, the male thread 14 does not have the intermittent portion 14b at all of the portion provided in the region above the vent 19, but at least one turn of the male thread 14 is provided in the region above the vent 19. It is configured to have a continuous threaded portion 14a.

In the present embodiment, the continuous threaded portion 14a of the male screw 14 is provided on the upper side of the vent hole 19 for only one turn. may be arranged side by side.

In the present embodiment, only one turn of the intermittent portion 14b of the male screw 14 is provided on the upper side of the vent hole 19. It is good also as a structure provided by. Further, in this embodiment, the intermittent portion 14b is provided on the lower side of the continuous threaded portion 14a, but the intermittent portion 14b may be provided on the upper side of the continuous threaded portion 14a. Furthermore, the plurality of continuous threaded portions 14a and intermittent portions 14b may be configured to be arranged in an arbitrary number in an arbitrary order.

The flat portion 11b has a rectangular shape whose upper end contacts the continuous screw portion 14a and whose lower end reaches the fitting portion 11a. The opening is located below the intermittent portion 14b of 11b.

The outer layer body 10 has parting lines PL corresponding to the parting lines of the mold on both sides of the outer surface with the axis O interposed therebetween. The parting line PL extends straight from the mouth portion 11 through the body portion 12 to the bottom portion 13 on the front side of the outer layer body 10 where the vent hole 19 is provided, and extends across the axis O from the front side. Also on the back side, it extends straight from the mouth portion 11 to the bottom portion 13 via the body portion 12 .

The vent 19 is provided so that its center is positioned on the parting line PL, and the continuous threaded portion 14a and the intermittent portion 14b of the male screw 14 are also provided on the parting line PL. A pair of end surfaces 14c of the intermittent portion 14b are perpendicular to a plane passing through the axis O and the parting line PL. The plane portion 11b is also perpendicular to the plane passing through the axis O and the parting line PL. Therefore, after molding the double container 1 using a mold, the mold is opened to the left and right without forcibly removing the continuous threaded portion 14a and the intermittent portion 14b in an undercut shape. The container 1 can be easily taken out. Therefore, the double container 1 having the above configuration can be easily manufactured using a left-right split mold.

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 in the shape of a truncated cylinder, and a female thread 31b provided on the inner peripheral surface of the cylindrical outer peripheral wall 31a of the cap body 31 is screwed to the male thread 14 of the mouth portion 11. It is attached to the mouth portion 11 by pressing it. 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 cylindrical 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 ball valve 33 is pushed by the projections 35c to release the fixation, and when the lid 35 is in the closed position and the double container 1 is in the inverted position, the ball valve 33 is pulled into the plurality of ribs by the columnar projections 35c. Reaching the tapered portion protruding radially inward of the upper end of 32c can be restricted.

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.

When the pouring cap 30 is attached to the mouth portion 11, the lower end side portion of the outer peripheral wall 31a of the cap body 31 is fitted to the fitting portion 11a provided on the lower end side of the mouth portion 11 on the inner peripheral surface thereof. As a result, the space between the outer peripheral wall 31a and the mouth portion 11 is isolated from the outside. On the other hand, the space between the outer peripheral wall 31a and the mouth portion 11 is communicated with the outside by a pair of grooves 15 provided on the outer peripheral surface of the fitting portion 11a. That is, the space between the outer layer body 10 and the inner layer body 20 communicates with the outside through the vent 19 and the groove 15 .

Next, the effects of the double container 1 of this embodiment having the above configuration will be described.

In the double container 1 of the present embodiment, since the slit-shaped outside air introduction port 16 is provided in the bottom portion 13 of the outer layer body 10, the cover 35 of the pouring cap 30 is closed and the discharge tube 31d is closed. In the closed state, if it is stored in a refrigerator or the like to be cooled and then left at room temperature, there is a risk that the slit-shaped outside air introduction port 16 will be sealed due to dew condensation or the like. However, in the double container 1 of the present embodiment, the opening 11 of the outer layer body 10 is provided with the vent 19 for communicating between the outer layer body 10 and the inner layer body 20 to the outside of the outer layer body 10. Even if the slit-shaped outside air introduction port 16 is sealed due to dew condensation or the like, the outer layer body 10 and the inner layer body 20 can be communicated with the outside (outside air) through the vent 19 . 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 heating is vented through the vent hole 19. to prevent the pressure of the air between the outer layer body 10 and the inner layer body 20 from being increased, and when the lid body 35 is opened, the contents are unexpectedly ejected from the discharge cylinder 31d to the outside. You can prevent it from being lost.

On the other hand, when the double container 1 is in a tilted position and the content is 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 content to allow ventilation. Although there is a risk that the opening 19 may be blocked, since the outside air introduction port 16 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.

In addition, in the double container 1 of the present embodiment, since the vent 19 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 19 when the double container 1 is sprayed with shower water to cool it. Even when a shrink label is attached, it is possible to prevent steam or the like from entering between the outer layer body 10 and the inner layer body 20 through the vent 19 .

Furthermore, in the double container 1 of the present embodiment, the external thread 14 integrally provided on the outer peripheral surface of the mouth portion 11 is attached to the upper side of the vent hole 19 so as to extend from one side of the mouth portion 11 in the circumferential direction with respect to the vent hole 19 . Since it is configured to have a continuous threaded portion 14a that continuously extends from one side to the other side, when the double container 1 is molded by extrusion blow molding, heat is applied to the inside of the mouth portion 11 in the UPI (upper plug-in). Even if the plug is inserted from above and the excess resin is pushed downward by the plug, the ventilation port 19 is formed so that the excess resin enters the part of the mold where the continuous screw portion 14a is formed. It is possible to suppress the excessive resin from being pushed down even to the part. As a result, an increase in the thickness of the peripheral portion of the mouth portion 11 around the vent 19 is suppressed, and the workability of drilling when forming the vent 19 is reduced. It is possible to prevent problems such as a decrease in releasability from occurring.

Furthermore, in the double container 1 of the present embodiment, the male screw 14 is configured to have the intermittent portion 14b on the lower side of the continuous screw portion 14a. By ensuring the length of the portion (hooking portion) of the male screw 14 that engages with the female screw 31b, the size and weight of the double container 1 can be reduced and the cost can be reduced. Further, since the male screw 14 is configured to have the intermittent portion 14b on the lower side of the continuous screw portion 14a, the length of the portion of the male screw 14 that engages with the female screw 31b is secured, and the inner layer around the vent 19 20 can be easily peeled off from the outer layer body 10, and an air passage directed from the air vent 19 to between the outer layer body 10 and the inner layer body 20 can be reliably formed.

Furthermore, in the double container 1 of the present embodiment, in the structure in which the mouth portion 11 is provided with the flat portion 11b, a part of the flat portion 11b is arranged in the intermittent portion 14b. The double container 1 can be reduced in size and weight, and the cost can be reduced by adopting a structure in which the vent hole 19 is opened in the plane portion 11b without increasing the length of the double container 1.

Furthermore, in the double container 1 of the present embodiment, at least one recessed groove 15 is provided on the outer peripheral surface of the fitting portion 11a of the mouth portion 11 so that the vent hole 19 communicates with the outside. The expanded portion due to the change in the ambient temperature of the air between the inner layer body 20 and the inner layer body 20 is surely discharged to the outside through the vent 19 and the groove 15, and the unintended ejection (self-ejection) of the contents is surely suppressed. be able to.

In this embodiment, each of the pair of grooves 15 is formed to have a rectangular cross section with a width of 0.5 mm and a depth of 0.3 mm. After the content has been discharged by its own weight, the area (flow path area) is such that when the body portion 12 of the outer layer 10 is squeezed to discharge the remaining content, the area between the outer layer 10 and the inner layer 20 of the air is suppressed from being discharged too much through the groove 15, and the pressure of the air is appropriately increased to maintain the dischargeability of the contents by squeezing. The shape and the like can be changed in various ways.

As shown in FIG. 2, 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.

In addition, the adhesive band 40 may be divided into two parts so as to be aligned across the parting line of the two-part mold used for extrusion blow molding, and the two parts may be configured to form one adhesive band 40. .

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 . In addition, the adhesive band 40 is provided on the side of the pinch-off portion 17 on which the ribs 18 are provided in the longitudinal direction, and the air vent 19 is located on the mouth portion 11 of the outer layer 10, i. It is provided at a position facing the adhesive band 40 and the rib 18 across the axis O of the heavy container 1 .

With 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 vent 19. Thus, the outer layer body 10 and the inner layer body 20 can be reliably communicated with the outside through the vent hole 19 .

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 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 container 1 of the present embodiment, as a method of initial peeling treatment for the configuration in which the bottom portion 13 is provided with the slit-shaped outside air introduction port 16 and the mouth portion 11 is provided with the vent port 19 For example, various methods such as a method of pushing 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 from the vent hole 19 provided in the mouth portion 11 can be used. However, considering that it is necessary to secure an airway not only in the part where the outside air inlet 16 is provided but also in the part where the vent 19 is provided, the initial peeling treatment is provided on the mouth 11. It is preferable to introduce a pressurized medium between the outer layer body 10 and the inner layer body 20 through the vent 19 .

In the double container 1 of the present embodiment, the rib 18 is provided between the end of the adhesive band 40 on the bottom 13 side and the longitudinal end of the external air inlet 16 on the adhesive band 40 side, and the bottom 13 Since the rib 18 is not provided on the side of the ventilation port 19 from the outside air introduction port 16 in plan view, the pressurized medium is introduced between the outer layer body 10 and the inner layer body 20 from the ventilation port 19. When the initial peeling process is performed, the inner layer body 20 is peeled from the side where the ribs 18 and the adhesive strips 40 are not provided and where the vent holes 19 are provided in plan view at the part of the outside air inlet 16 of the bottom part 13. In this way, the inner layer body 20 at the portion of the bottom portion 13 where the outside air inlet 16 is provided can be reliably separated from the outer layer body 10 .

In the above configuration, since both the rib 18 and the adhesive band 40 are provided on one side in the longitudinal direction of the outside air introduction port 16, the outside air is introduced starting from the other longitudinal side on which the rib 18 and the adhesive band 40 are not provided. The slit width of the mouth 16 may expand to the thickening portion 50, and the discharge performance may be deteriorated. 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 17 of the bottom portion 13 are brought closer to each other, so that the outside air introduction port 16 extends in the longitudinal direction. 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 male thread 14 is a single thread, but it may be a multiple thread such as a double thread. In this case, at least one male screw 14 located above the vent 19 may be provided with a continuous threaded portion 14a.

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. Alternatively, an inner layer formed separately from the outer layer may be incorporated.

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 embodiment, the lower end portion of the outer peripheral wall 31a of the cap body 31 is fitted into the fitting portion 11a provided on the lower end side of the mouth portion 11, and the fitting portion 11a is provided on the outer peripheral surface of the fitting portion 11a. Although the vent 19 is communicated with the outside through the recessed groove 15, for example, the lower end side portion of the outer peripheral wall 31a of the cap body 31 is not fitted to the fitting portion 11a of the mouth portion 11. For example, without providing the fitting portion 11a and the recessed groove 15, it is also possible to configure the vent hole 19 provided in the outer layer body 10 to communicate with the outside.

1 double container 10 outer layer body 11 mouth portion 11a fitting portion 11b flat portion 12 body portion 12a shoulder portion 12b body portion 13 bottom portion 13a outer peripheral edge portion 13b recess 14 male thread 14a continuous thread portion 14b intermittent portion 14c end surface 15 recess groove 16 Outside air inlet 17 Pinch-off part 18 Rib 19 Vent 20 Inner layer body 21 Housing space 22 Opening end 30 Spout cap 31 Cap main body 31a Peripheral wall 31b Internal thread 31c Top wall 31d Discharge cylinder 32 Inner stopper 32a Cylindrical part 32b Valve seat part 32c Rib 33 Ball valve 34 Hinge 35 Lid 35a Ceiling wall 35b Plug member 35c Columnar projection 40 Adhesive strip 50 Thickening part O Shaft center M Moil cut part PL Parting line

Claims (7)

a bottle-shaped outer layer body having a mouth, a body and a bottom;
a volume-reducing and deformable inner layer body, which has a space for accommodating contents and is housed in the outer layer body;
A synthetic resin double container having a slit-shaped outside air introduction port provided in the bottom of the outer layer body and introducing outside air between the outer layer body and the inner layer body,
a male screw provided integrally with the outer peripheral surface of the mouth;
a vent provided in the mouth portion for communicating between the outer layer body and the inner layer body to the outside of the outer layer body,
the male thread has a continuous threaded portion that extends continuously from one side to the other side in the circumferential direction of the mouth with respect to the vent on the upper side of the vent ;
A double container , wherein the male thread has an intermittent portion below the continuous thread portion . A flat portion perpendicular to the radial direction of the mouth is provided on the outer peripheral surface of the mouth,
2. The double container according to claim 1 , wherein said vent openings in said flat portion and a portion of said flat portion is arranged in said intermittent portion. The outer layer body has parting lines extending from the mouth portion to the bottom portion via the trunk portion on both sides of the outer layer body, and
3. The double container according to claim 1 or 2 , wherein said vent is provided on said parting line. 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;
4. The double container according to any one of claims 1 to 3 , further comprising at least one groove provided on the outer peripheral surface of said fitting portion for communicating said vent with the outside. 5. The double container according to claim 4 , wherein a pair of said concave grooves having the same cross-sectional area are opposed 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,
The double container according to any one of claims 1 to 5 , wherein said vent is provided at a position facing said adhesive band 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. 7. The double container of claim 6 , wherein the double container is

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