JP7427335B2 - container with liquid - Google Patents

Description

TECHNICAL FIELD The present invention relates to a liquid-filled container in which a liquid is stored in a container body.

Conventionally, an outer layer body comprising a mouth and a body is used as a liquid container in which a liquid such as cosmetics such as lotion, shampoo, conditioner, liquid soap, food seasoning, or medicine is stored in the container body. a mouth portion of a double-structured container body, which includes: an inner layer body provided inside the outer layer body so as to be capable of reducing and deforming the volume; and an outside air inlet for introducing outside air between the outer layer body and the inner layer body. There is also known a structure in which a discharge cap is attached which includes a discharge port and a check valve that opens and closes the discharge port.

In such liquid-filled containers, by tilting the container so that the discharge port faces downward and pressing (squeezing) the body of the container body, the liquid contained in the inner layer body is discharged from the discharge port to the outside. can be done. In addition, when the pressure on the body is released after discharging the content liquid, the check valve prevents the outside air from flowing into the inner layer from the discharge port, and the space between the outer layer and the inner layer through the outside air inlet. By introducing outside air, only the outer layer body can be restored to its original shape while the inner layer body is deformed to reduce its volume. Therefore, according to such a liquid-filled container, the liquid content stored in the inner layer body can be discharged to the outside without being replaced with outside air. By making it difficult for the material to come into contact with the material, it is possible to suppress its deterioration and alteration.

Conventionally, as a liquid-filled container as described above, the container body is formed by blow molding a preform assembly in which an inner preform made of polyester resin is assembled inside an outer preform made of polyester resin. Blow-molded products made from the above are known (see, for example, Patent Document 1).

JP 2017-128383 Publication

A container body made of polyester resin has a body that has higher rigidity than an extrusion blow molded container, which is formed into a double structure by extrusion blow molding, where the outer layer is made of polyethylene resin and the inner layer is made of EVOH resin. . Therefore, especially when the remaining amount of the liquid stored in the inner layer body has decreased and there is only a small amount left, when pressing the body and discharging the liquid, it is necessary to discharge the liquid. There was a problem in that a larger pressing force was required for the body than in an extrusion blow-molded container, and the discharging operation was difficult.

The present invention aims to solve these problems, and its purpose is to provide a liquid container that can easily discharge the liquid content even when the remaining amount of the liquid content is reduced. Our goal is to provide the following.

The liquid-filled container of the present invention includes an outer layer body having a mouth portion and a body portion, an inner layer body provided inside the outer layer body so as to be able to reduce and deform, and a space between the outer layer body and the inner layer body. A container body made of polyester resin is provided with an outside air introduction port for introducing outside air, a discharge port, a check valve for opening and closing the discharge port , and a flow of outside air from the ventilation port toward the outside air introduction port. an outside air check valve that operates to allow and block the flow of outside air from the outside air inlet toward the vent , a discharge cap attached to the mouth, and a discharge cap housed in the container body and a liquid content configured such that when the body is squeezed, the liquid content stored in the container body is discharged to the outside from the discharge port of the discharge cap. a container in which a head space containing gas is provided inside the inner layer body, the volume of the head space is within a range of 12 to 20% of the internal volume of the inner layer body; The main body is a blow molded product formed by blow molding a preform assembly in which an inner preform made of polyester resin is assembled inside an outer preform made of polyester resin , and the inner diameter of the discharge port is a minimum The check valve is characterized by being set to generate a reaction force of 30 to 70 mN when the check valve is pushed up 0.5 mm in the opening direction .

In the liquid-filled container of the present invention having the above configuration, it is preferable that the volume of the head space is within a range of 14 to 20% of the internal volume of the inner layer body.

In the liquid-filled container of the present invention having the above configuration, it is preferable that the volume of the head space is within a range of 14 to 15% of the internal volume of the inner layer body.

In the liquid container of the present invention having the above configuration, it is preferable that the container main body is made of polyethylene terephthalate resin.

In the liquid-filled container of the present invention having the above configuration, it is preferable that the content liquid is a liquid food product.

According to the present invention, it is possible to provide a liquid container that can easily discharge the content liquid even when the remaining amount of the content liquid is reduced.

FIG. 1 is a partially cutaway front view of a liquid container according to an embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view of a discharge cap portion of the liquid container shown in FIG. 1. FIG. FIG. 2 is a partially cutaway front view of a preform assembly for molding the container body shown in FIG. 1; FIG. 7 is a characteristic diagram showing changes in the load required to press the body during oblique discharge in a liquid-filled container of an example and a liquid-filled container of a comparative example.

Hereinafter, the present invention will be explained in more detail with reference to the drawings.

As shown in FIG. 1, a liquid container 1 according to the present embodiment includes a container body 10 and a discharge cap 20, and a liquid content 30 is stored in the container body 10.

In this specification and claims, the vertical direction refers to the vertical direction when the liquid-filled container 1 is in an upright position with the discharge cap 20 positioned above the container body 10, as shown in FIG. The radial direction is defined as a direction along a straight line passing through the axis O of the liquid container 1 and perpendicular to the axis O.

The container body 10 is also called a laminated container, and has a double structure including an outer layer 11 and an inner layer 12 disposed inside the outer layer 11.

The outer layer body 11 is a part that constitutes the outer shell of the container body 10, and has a bottle shape including a cylindrical mouth portion 11a and a bottomed cylindrical body portion 11b that is integrally connected to the lower end of the mouth portion 11a. It has become.

As shown in FIG. 2, a male thread 11c is integrally provided on the outer peripheral surface of the mouth portion 11a. Further, a neck ring 11d is integrally provided on the outer circumferential surface of the mouth portion 11a at a portion below the male thread 11c.

As shown in FIG. 1, the body portion 11b gradually expands in diameter downward from the lower end of the mouth portion 11a, and extends outward in the radial direction with respect to the mouth portion 11a. It has a shape with a slightly constricted part. The body portion 11b has flexibility, and can be elastically deformed and dented radially inward when pressed (squeezed), and can return to its original shape from the dented state by the elastic force. can be restored.

Note that the shape of the body portion 11b is not limited to the above, and can be changed in various ways.

The inner layer body 12 has an inner opening portion 12a and a storage portion 12b.

As shown in FIG. 2, the inner opening 12a has a substantially cylindrical shape with a smaller diameter than the opening 11a, and is disposed coaxially inside the opening 11a. A gap 13 is provided between the mouth portion 11a and the inner mouth portion 12a. The upper end of the inner opening 12a is in contact with the inner peripheral surface of the opening 11a over the entire circumference, so that the gap 13 between the opening 11a and the inner opening 12a is closed from the outside. There is. Note that a plurality of vertical ribs 12c for forming gaps 13 are integrally provided at intervals in the circumferential direction on the inner opening 12a.

As shown in FIG. 1, the storage portion 12b is formed into a bag shape with a thinner wall than the body portion 11b, and is integrally connected to the lower end of the inner opening portion 12a and is removably laminated on the inner surface of the body portion 11b. There is. That is, in this embodiment, the container body 10 is a laminated peelable container. The inside of the storage portion 12b is a storage space S, and a predetermined amount of the liquid content 30 is stored in the storage space S. The storage section 12b can be deformed to reduce its volume, and as the liquid content 30 is discharged to the outside of the storage space S, it peels off from the inner surface of the body section 11b and undergoes deformation to reduce its internal volume. (transformed into).

The container body 10 is equipped with an outside air inlet 14. In this embodiment, a plurality of outside air introduction ports 14 are provided in the mouth portion 11a. As shown in FIG. 2, these outside air inlet ports 14 are elongated through holes that radially penetrate the mouth portion 11a and extend in the circumferential direction, and are spaced at predetermined intervals in the circumferential direction. They are arranged side by side. The plurality of outside air introduction ports 14 each communicate between the outer layer body 11 and the inner layer body 12 (gap 13), and can introduce outside air between the outer layer body 11 and the inner layer body 12.

Note that the number of outside air inlets 14 can be set arbitrarily as long as at least one is provided.

The container body 10 is made of polyester resin.

In this embodiment, the container body 10 is made of polyethylene terephthalate resin. That is, both the outer layer 11 and the inner layer 12 that constitute the container body 10 are made of polyethylene terephthalate resin. By making the outer layer body 11 and the inner layer body 12 each made of polyethylene terephthalate resin, the container body 10 can be made into a container that is lightweight, highly transparent, and highly recyclable.

The container body 10 can be a blow molded product formed by blow molding the preform assembly 40 shown in FIG. The preform assembly 40 includes an inner preform 42 made of polyethylene terephthalate resin for forming the inner layer body 12 built into an outer preform 41 made of polyethylene terephthalate resin for forming the outer layer body 11 . A heavy structure can be used.

For example, the outer preform 41 is formed by injection molding polyethylene terephthalate resin using an injection mold, and is formed by blow molding to form an opening 41a having the same shape as the opening 11a of the outer layer body 11, and a lower end of the opening 41a. It can be formed into a substantially test tube shape having a bottomed cylindrical extension portion 41b that is extended. In addition, since the outer preform 41 has an opening 41a having the same shape as the opening 11a of the outer layer body 11, each part of the outer preform 41 constituting the opening 41a is designated by the same reference numeral as in FIG. It is attached.

On the other hand, the inner preform 42 is formed by injection molding polyethylene terephthalate resin using an injection mold, so that the inner preform 42 has an inner opening 42a having approximately the same shape as the inner opening 12a of the inner layer body 12, and a lower end of the inner opening 42a. It may be formed into a substantially test tube shape having a bottomed cylindrical extending portion 42b that is continuously extended by blow molding. Note that a plurality of vertical ribs 12c similar to those of the inner layer body 12 are integrally provided on the outer peripheral surface of the inner opening portion 42a at intervals in the circumferential direction.

By blow molding the preform assembly 40 having such a configuration, the container body 10 shown in FIG. 1 can be formed. In this embodiment, biaxial stretch blow molding is employed as the blow molding. Note that most of the mouth portion 41a of the outer preform 41 and the inner mouth portion 42a of the inner preform 42 are not stretched during blow molding.

In this embodiment, soy sauce is stored in the container body 10 as the liquid content 30.

The liquid content 30 stored in the container body 10 is not limited to soy sauce, but may also include cosmetics such as lotion, other liquid foods such as shampoo, conditioner, liquid soap, and food seasoning, or drugs. It can be a variety of liquids.

Next, the configuration of the discharge cap 20 will be explained.

As shown in FIG. 2, the discharge cap 20 includes a cap body 21 and a lid body 22. The discharge cap 20 can be an injection molded product made of polyethylene resin or polypropylene resin, for example.

The cap body 21 has a capped cylindrical shape that covers the opening 11a, and is attached to the opening 11a by screwing the female thread 21a to the male thread 11c.

The cap body 21 is provided with a discharge port 21b, and the liquid content 30 stored in the storage space S of the inner layer body 12 can be discharged to the outside from the discharge port 21b. In the present embodiment, the discharge port 21b is formed in a cylindrical shape that curves outward while gradually expanding in diameter toward the top, and its inner diameter (diameter) is approximately 2 to 5 mm at its smallest portion. It is said that Note that the shape and size of the discharge port 21b can be changed in various ways.

An inner stopper 23 is attached to the inside of the cap body 21, and a check valve 24 is attached to the inner stopper 23.

The inner stopper 23 is provided with an outflow hole 23a that allows the content liquid 30 to flow out from the storage space S to the discharge port 21b. Furthermore, an annular wall 25 is provided between the cap body 21 and the inner stopper 23 to define a flow path for the liquid content 30 between the discharge port 21b and the outflow hole 23a.

The check valve 24 has a plate shape (disk shape), and is arranged on the upper surface of the inner stopper 23 to close the outflow hole 23a. Further, the check valve 24 is connected to the annular wall 25 by a plurality (three) of elastically deformable legs 24a. As a result, the check valve 24 moves toward and away from the upper surface of the inner plug 23, allowing the content liquid 30 to flow out from the storage space S toward the discharge port 21b, and The outflow hole 23a is opened and closed so as to prevent the content liquid 30 and outside air from flowing from the storage space S into the storage space S. That is, the check valve 24 opens and closes the discharge port 21b with respect to the storage space S, and prevents outside air from entering the storage space S from the discharge port 21b while discharging the content liquid 30 to the outside from the discharge port 21b. It functions to suppress. Note that the check valve 24 is set to generate a reaction force of 100 mN or less (for example, about 30 to 70 mN) when pushed up by 0.5 mm in the opening direction.

The cap body 21 is in contact with an annular seal protrusion 11e provided on the outer peripheral surface of the mouth portion 11a over the entire circumference below the outside air introduction port 14. Thereby, the inside of the cap body 21 is closed off from the outside.

The cap body 21 is provided with a vent 21c, through which outside air can be drawn into the cap body 21 from the outside and supplied to the outside air introduction port 14. The cap body 21 also includes an outside air vent that operates to allow the flow of outside air from the ventilation port 21c toward the outside air introduction port 14, and to block the flow of outside air from the outside air introduction port 14 toward the ventilation port 21c. A check valve 26 is provided.

Note that the inner stopper 23 is provided with a suck-back ball valve 27 for drawing the remaining liquid 30 inside the discharge port 21b into the cap body 21 after the liquid 30 is discharged. You can also do it.

The lid body 22 has a capped cylindrical shape with approximately the same diameter as the cap body 21. The lid body 22 is connected to the cap body 21 by a hinge 28 at a part of its outer peripheral surface, and the cap body 21 can be opened and closed.

The liquid-filled container 1 having the above configuration can store the contents in the storage space S of the inner layer body 12 by tilting the container body 10 so that the mouth portion 11a faces downward and pressing (squeezing) the body portion 11b. The liquid 30 can be discharged to the outside from the discharge port 21b of the discharge cap 20, and when the pressure on the body portion 11b is released after the content liquid 30 has been discharged, the inner layer body 12 can be discharged from the discharge port 21b by the check valve 24. At the same time as preventing outside air from flowing into the storage space S, outside air is introduced between the outer layer body 11 and the inner layer body 12 through the outside air introduction port 14, and only the outer layer body 11 is deformed while the inner layer body 12 is reduced in volume. It can be restored to its original shape. Thereby, the content liquid 30 stored in the storage space S of the inner layer body 12 is discharged to the outside without being replaced with outside air, and the content liquid 30 remaining inside the storage space S of the inner layer body 12 is removed. It is possible to make it difficult to come into contact with air and suppress its deterioration and alteration.

In the liquid-filled container 1, the container body 10 includes an outer layer body 11 having a mouth portion 11a and a body portion 11b, an inner layer body 12 provided inside the outer layer body 11 so as to be deformable to reduce its volume, and an outer layer body. 11 and an outside air inlet 14 for introducing outside air between the inner layer body 12. It has a configuration in which the stop valve 24 is attached to the mouth part 11a, and thereby, by pressing the body part 11b, the content liquid 30 stored in the container body 10 is replaced with outside air from the discharge port 21b. The configurations of the container body 10 and the discharge cap 20 that constitute the liquid-filled container 1 are not limited to those described above, and can be modified in various ways as long as they are configured to be able to discharge the liquid without any problem.

As shown in FIG. 1, in the liquid-filled container 1 of this embodiment, the amount of the liquid content 30 stored inside the inner layer body 12 of the container body 10 is smaller than the inner volume of the inner layer body 12. There is. Thereby, a head space HS is provided inside the inner layer body 12 above the liquid level of the content liquid 30, in which the content liquid 30 is not accommodated but gas is accommodated.

In this embodiment, the gas constituting the head space HS is air, but the gas constituting the head space HS may be other gases, for example, by using an inert gas such as nitrogen, deterioration of the liquid content is suppressed. can do.

In the liquid container 1 equipped with a double-structured container body 10 having an outer layer body 11 and an inner layer body 12, a head space HS containing gas is provided inside the inner layer body 12. The volume of the storage portion 12b of the inner layer body 12 when the remaining amount of the liquid content 30 stored in the inner layer body 12 is reduced is compared to the case where no head space HS is provided. can be increased by the volume of the gas that makes up the . As a result, when the remaining amount of the liquid content 30 stored in the inner layer body 12 is reduced and there is only a small amount left, when the body part 11b is pressed to discharge the liquid content 30, the pressing force is increased. By transmitting the gas to the liquid content 30 via the gas constituting the head space HS, the liquid content 30 can be easily discharged with a smaller pressing force than when the head space HS is not provided.

On the other hand, in the liquid-filled container 1 of this embodiment, the container body 10 is made of polyethylene terephthalate resin (polyester resin), so the outer layer is made of polyethylene resin and the inner layer is made of EVOH resin by extrusion blow molding, for example. Compared to an extrusion blow-molded container formed in a double structure, the body 11b has a higher rigidity, and the pressing force on the body 11b required to discharge the content liquid 30 also increases accordingly.

Therefore, in the liquid container 1 of the present embodiment, a head space HS containing gas is provided inside the inner layer body 12, and the volume of the head space HS is set to 12 to 20% of the inner volume of the inner layer body 12. I try to keep it within the range. By setting the volume of the head space HS within the range of 12 to 20% of the internal volume of the inner layer body 12, even if the container body 10 is made of polyethylene terephthalate resin (polyester resin), it can be stored in the inner layer body 12. When the remaining amount of the content liquid 30 is reduced and there is only a small amount left, extrusion blowing is performed as the container body without excessively increasing the pressing force against the body 11b required to discharge the content liquid 30. The content liquid 30 can be easily discharged with a relatively small pressing force similar to that when a molded container is used.

Here, the internal volume of the inner layer body 12 is the volume of the internal space in the container body 10 alone, including both the mouth portion 12a and the storage portion 12b of the inner layer body 12, and the content that can be filled inside the inner layer body 12. The volume is equal to the maximum amount of liquid 30. Further, the volume of the head space HS is a volume corresponding to the difference between the internal volume of the inner layer body 12 and the amount of the content liquid 30 actually stored inside the inner layer body 12.

As described above, in the liquid container 1 of the present embodiment, the head space HS in which gas is stored is provided inside the inner layer body 12, and the volume of the head space HS is set to 12 to 20 times the inner volume of the inner layer body 12. %, the content liquid 30 can be easily discharged with a relatively small pressing force even when the remaining amount of the content liquid 30 stored in the inner layer body 12 has decreased and only a small amount remains. Can be done. Therefore, the liquid-containing container 1 of the present embodiment has excellent operability in discharging the content liquid 30, and can reduce the amount of the content liquid 30 remaining in the inner layer body 12.

Note that if the volume of the head space HS provided inside the inner layer body 12 is less than 12% of the internal volume of the inner layer body 12, the remaining amount of the content liquid 30 stored in the inner layer body 12 will decrease. When there is only a small amount left, the pressing force against the body 11b necessary to discharge the content 30 becomes excessively large, making it difficult to press the body 11b, and the inner layer cannot be discharged. The amount of content liquid 30 remaining inside the body 12 increases. On the other hand, if the volume of the head space HS provided inside the inner layer body 12 is made larger than 20% of the internal volume of the inner layer body 12, the head space HS becomes excessively large and the head space HS is Contact with the gas may deteriorate the quality of the liquid content 30 stored in the inner layer body 12 or cause a misunderstanding that the liquid container 1 has already been opened, which is not preferable.

In the liquid container 1 of this embodiment, the volume of the head space HS provided inside the inner layer body 12 is more preferably within the range of 14 to 20% of the internal volume of the inner layer body 12. By setting the volume of the head space HS within the range of 14 to 20% of the internal volume of the inner layer body 12, the remaining amount of the content liquid 30 stored in the inner layer body 12 is reduced to a state where only a small amount remains. In this case, the content liquid 30 can be more reliably discharged with a relatively small pressing force.

In the liquid container 1 of this embodiment, the volume of the head space HS provided inside the inner layer body 12 is more preferably within the range of 14 to 15% of the internal volume of the inner layer body 12. By setting the volume of the head space HS within the range of 14 to 15% of the internal volume of the inner layer body 12, the remaining amount of the content liquid 30 stored in the inner layer body 12 is reduced to a state where only a small amount remains. In this case, the content liquid 30 can be more reliably discharged with a relatively small pressing force.

In order to confirm the effects of the present invention, liquid-filled containers of Example 1, Example 2, Example 3, and Comparative Example were prepared, and these liquid-filled containers were subjected to the pressure necessary for pressing the body during inclined discharge. A test was conducted to measure the change in load.

The liquid containers of Examples 1, 2, 3, and Comparative Examples each had a container body and a discharge cap having the same configuration as the liquid container 1 described above, and the container body (inner layer The internal volume of the body was 510 ml. In addition, the check valve provided on the discharge cap has a three-point valve configuration that generates a reaction force of 55 mN when displaced by 0.5 mm in the opening direction, and the inner diameter (minimum diameter) of the discharge port is 3.5 mm. did. The liquid content stored in the container body was soy sauce with a viscosity of about 3 mPa·s.

The liquid container of Example 1 had a structure in which a container body with an internal volume of 510 ml contained 70 ml of liquid. In the liquid container of Example 1, the volume of the head space was 13.7% of the internal volume of the inner layer.

The liquid container of Example 2 had a structure in which a container body with an internal volume of 510 ml contained 80 ml of liquid. In the liquid container of Example 2, the volume of the head space was 15.7% of the internal volume of the inner layer.

The liquid-filled container of Example 3 had a structure in which 90 ml of liquid was stored in a container body with an internal volume of 510 ml. In the liquid container of Example 3, the volume of the head space was 17.6% of the internal volume of the inner layer.

The liquid-filled container of the comparative example had a structure in which a container body with an internal volume of 510 ml contained 60 ml of liquid. In the liquid-filled container of the comparative example, the volume of the head space is 11.8% of the internal volume of the inner layer body.

In the above test, each of the liquid-filled containers of Example 1, Example 2, Example 3, and Comparative Example was placed so that the discharge port faced downward and the axis of the container body was at an angle of 45 degrees with respect to the vertical direction. Tilt the container into a tilted position at an angle of , and in this state press a round bar against the vertical center of the body from a direction perpendicular to the axis of the container body to drain the liquid contained in the container body from the discharge port. The discharge operation of discharging 45 g was performed multiple times (12 times), and the load (pressing force) applied by the round bar to the body in each discharge operation was measured.

FIG. 4 shows the above test results.

As shown in FIG. 4, from the 1st to the 9th dispensing number, in the liquid containers of Example 1, Example 2, Example 3, and Comparative Example, the length of the body required for discharging the content liquid was There is no big difference in the pressing force, and although the pressing force gradually increases in both cases, the load is relatively small. In the 10th dispensing operation when the remaining amount of the content liquid is low, in any of the liquid-filled containers of Example 1, Example 2, Example 3, and Comparative Example, the body part necessary for discharging the content liquid is The pressing force of increases.

In the 11th discharge operation when only a small amount of the content liquid remained, the pressing force was the maximum in all of the liquid containers of Example 1, Example 2, Example 3, and Comparative Example.

Here, in the liquid-filled container of the comparative example, the pressing force in the 11th discharge operation was 160 N or more, and it was difficult to push the body part all the way. As described above, it was confirmed that in the liquid-filled container of the comparative example, the operability of discharging the content liquid was poor when the remaining amount of the content liquid was decreased, and therefore the remaining amount of the content liquid was increased.

On the other hand, in the liquid containers of Examples 1, 2, and 3, the pressing force in the 11th discharge operation was 150 N or less, which was a relatively small pressing force. Furthermore, in the liquid-filled containers of Examples 1, 2, and 3, the remaining amount of the contents was 2% or less of the amount initially stored in the container body. This confirmed that the liquid containers of Examples 1, 2, and 3 had excellent operability in discharging the liquid contents when the remaining amount of the liquid contents was reduced.

It goes without saying that the present invention is not limited to the embodiments described above, and can be modified in various ways without departing from the spirit thereof.

For example, in the embodiment described above, the container body 10 is a laminated peelable container, but the container body 10 is not limited to this. It can also be a double container.

Further, in the embodiment, the container main body 10 is made of polyethylene terephthalate resin, but is not limited to this, and may be made of other resin as long as it is made of polyester resin.

Furthermore, in the embodiment, the outside air introduction port 14 for introducing outside air between the outer layer body 11 and the inner layer body 12 is provided in the mouth portion 11a of the outer layer body 11, but the invention is not limited to this. For example, it may be provided at other locations such as the body portion 11b or the bottom portion of the container body.

1 Liquid-filled container 10 Container body 11 Outer layer 11a Mouth 11b Body 11c Male screw 11d Neck ring 11e Seal protrusion 12 Inner layer 12a Inner opening 12b Storage portion 12c Vertical rib 13 Gap 14 Outside air inlet 20 Discharge cap 21 Cap body 21a Female thread 21b Discharge port 22 Lid 23 Inner stopper 23a Outlet hole 24 Check valve 24a Legs 25 Annular wall 26 Outside air check valve 27 Ball valve 28 Hinge 30 Content liquid 40 Preform assembly 41 Outer preform 41a Mouth 41b Stretching section 42 Inner preform 42a Inner opening 42b Stretching section O Axial center S Storage space HS Head space

Claims (5)

an outer layer body having a mouth portion and a body portion; an inner layer body provided inside the outer layer body so as to be able to reduce and deform; and an outside air introduction for introducing outside air between the outer layer body and the inner layer body. A container body made of polyester resin and having an opening;
a discharge port, a check valve for opening and closing the discharge port, and a check valve configured to allow the flow of outside air from the vent to the outside air inlet and to prevent the flow of outside air from the outside air inlet to the vent. a discharge cap attached to the mouth, and a discharge cap mounted on the mouth;
and a liquid content stored in the container body ,
A liquid-filled container configured such that when the body is squeezed, the liquid contained in the container body is discharged to the outside from the discharge port of the discharge cap,
A head space containing gas is provided inside the inner layer body,
The volume of the head space is within the range of 12 to 20% of the internal volume of the inner layer body,
The container body is a blow molded product formed by blow molding a preform assembly in which an inner preform made of polyester resin is assembled inside an outer preform made of polyester resin,
The inner diameter of the discharge port is 2 to 5 mm at the smallest portion,
A liquid-filled container characterized in that the check valve is set to generate a reaction force of 30 to 70 mN when pushed up 0.5 mm in the opening direction . The liquid-filled container according to claim 1, wherein the volume of the head space is within a range of 14 to 20% of the internal volume of the inner layer body. The liquid-filled container according to claim 2, wherein the volume of the head space is within a range of 14 to 15% of the internal volume of the inner layer body. The liquid-filled container according to any one of claims 1 to 3, wherein the container body is made of polyethylene terephthalate resin. The liquid-filled container according to any one of claims 1 to 4, wherein the content liquid is a liquid food.

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