JP7305275B2 - Preform assembly, delamination container, and method for producing delamination container - Google Patents

Description

TECHNICAL FIELD The present disclosure relates to a synthetic resin preform assembly, a delaminated container, and a method for manufacturing the delaminated container.

By blow-molding a preform assembly in which an inner preform is incorporated inside an outer preform as a container for containing food seasonings such as soy sauce, beverages, cosmetics, shampoo, rinse, liquid soap, etc. , an outer container body having a cylindrical outer mouth and a body connected to the outer mouth; an inner container body provided with a volume-reducing and deformable accommodating portion, and a cylindrical portion integrally connected to the trunk portion and provided with an outside air introduction passage communicating between the trunk portion and the accommodating portion. A delamination container (delamination container) made of a synthetic resin and having a double structure is known (see, for example, Patent Document 1).

In such a delaminating container, the storage portion of the inner container body can be peeled off from the inner surface of the trunk portion of the outer container body by introducing outside air from the cylindrical portion. As a result, while maintaining the original shape of the outer container body, only the containing portion of the inner container body is reduced in volume and deformed so that the content liquid contained in the containing portion can be discharged to the outside without being replaced with outside air. Therefore, it is possible to reduce the contact of the outside air with the content liquid stored in the storage section, thereby suppressing the deterioration, deterioration, etc. of the content liquid.

Further, such a delamination container can be used as a server by attaching a discharge tool to the outer opening and attaching a pressurizing device to the cylindrical portion, for example. In this case, a pressurized medium such as pressurized air is supplied between the barrel and the container from the pressurizing device through the outside air introduction passage of the cylindrical portion, and the pressure between the barrel and the container is increased. By doing so, the content liquid can be automatically discharged to the outside from the discharge port provided in the discharge tool only while the discharge port is open.

JP-A-2014-28627

However, in the delamination container of Patent Document 1, since the mating surfaces of the outer preform and the inner preform are exposed to the side, the content spilled from the outer opening may cause the outer container body and the inner container body to be separated. There were times when it got in the middle, and there was room for improvement.

The present disclosure has been made in view of such problems, and an object of the present disclosure is to prevent contents spilled from the mouth from entering between the outer container body and the inner container body. It is an object of the present invention to provide a reformed assembly, a delaminated container, and a method for manufacturing the delaminated container.

The preform assembly of the present disclosure includes:
A preform assembly in which an outer preform is attached to the outside of an inner preform,
The inner preform has a tubular mouth, a neck ring provided at the bottom of the mouth, and a housing section that continues below the mouth,
The outer preform includes a body portion arranged radially outward of the accommodating portion, and a fitting protrusion provided above the body portion and fitted into a fitting recess recessed upward from the lower surface of the neck ring. and
A bottom portion of the body portion of the outer preform is provided with an outside air introduction path.

Further, in the preform assembly of the present disclosure, in the configuration described above, it is preferable that the fitting convex portion has a flange portion radially extending along the neck ring from above the body portion.

Further, in the preform assembly of the present disclosure, in the configuration described above, it is preferable that the outside air introduction path is formed in a gate portion of a mold into which material flows when molding the outer preform.

Further, in the preform assembly of the present disclosure, in the configuration described above, it is preferable that a gap is provided in at least one of the radial direction and the vertical direction between the body portion and the accommodating portion.

Moreover, in the preform assembly of the present disclosure, in the above configuration, it is preferable that the outer preform and the inner preform are each made of polyethylene terephthalate resin.

In addition, the delamination container of the present disclosure is
A delaminating container made of synthetic resin,
an inner container body having a cylindrical mouth, a neck ring provided at the lower part of the mouth, and a volume-reducing and deformable accommodating part connected to the lower part of the mouth;
An outer container body having a body portion arranged radially outward of the accommodating portion, and a fitting convex portion provided above the body portion and fitted into a fitting concave portion recessed upward from the lower surface of the neck ring. and
A bottom portion of the trunk portion of the outer container body is provided with an outside air introduction path.

In addition, the method for manufacturing the delamination container of the present disclosure includes:
A method for manufacturing a synthetic resin delaminated container formed by blow molding a preform assembly in which an outer preform is attached to the outside of an inner preform, comprising:
a step of forming an inner preform having a cylindrical mouth, a neck ring provided at the bottom of the mouth, and an accommodating portion continuing below the mouth;
An outer preform having a body portion disposed radially outward of the accommodating portion, and a fitting protrusion provided above the body portion and fitted into a fitting recess recessed upward from the lower surface of the neck ring. forming a
forming a preform assembly by attaching the outer preform to the outside of the inner preform;
and blow molding the preform assembly;
A bottom portion of the body portion of the outer preform is provided with an outside air introduction path.

According to the present disclosure, a preform assembly, a delamination container, and a method for manufacturing a delamination container can suppress contents spilled from the mouth from entering between the outer container body and the inner container body. can be provided.

1 is a half cross-sectional view of a delaminating container according to one embodiment of the present disclosure; FIG. FIG. 1B is a detailed view of part A in FIG. 1A; 1B is a half cross-sectional view of a preform assembly for forming the delaminated container shown in FIG. 1A; FIG. 3 is a half cross-sectional view of the inner preform shown in FIG. 2; FIG. 3 is a half cross-sectional view of the outer preform shown in FIG. 2; FIG. 4 is a flow chart showing steps of a method for manufacturing a delamination container according to an embodiment of the present disclosure.

Hereinafter, the preform assembly 30 and the delamination container 1, which are an embodiment of the present disclosure, will be described more specifically with reference to the drawings.

In addition, in the present specification and claims, the vertical direction means the vertical direction when the delamination container 1 is in an upright position as shown in FIG. 1A. In addition, the outward direction is the direction from the storage portion 22 side of the inner container body 20 described later to the body portion 12 side of the outer container body 10, and the inward direction is the direction from the body portion 12 side of the outer container body 10 to the body portion 12 side of the outer container body 10. This is the direction toward the accommodating portion 22 side of the container body 20 . Further, the radial direction means a direction along a straight line passing through the axis O of the delamination container 1 and perpendicular to the axis O. As shown in FIG.

A delamination container 1, which is an embodiment of the present disclosure shown in FIG. It is made of synthetic resin and is also called a delamination container (delamination container). The delaminating container 1 has a double structure having an inner container body 20 and an outer container body 10 covering the inner container body 20 from the outside.

In this embodiment, the outer container body 10 and the inner container body 20 are both made of polyethylene terephthalate resin (PET). By using polyethylene terephthalate resin for the outer container body 10 and the inner container body 20, respectively, the delaminated container 1 can be made lightweight and highly transparent.

The inner container body 20 includes a cylindrical mouth portion 21 , a neck ring 21 b provided below the mouth portion 21 , and an accommodating portion 22 integrally connected to the bottom of the mouth portion 21 .

The mouth portion 21 has a cylindrical shape, and a male screw portion 21a is integrally provided on the outer peripheral surface thereof. The male threaded portion 21a is provided so as to protrude radially outward from the outer peripheral surface of the mouth portion 21. By threadingly engaging the male threaded portion 21a, for example, a discharge cap having a discharge port or a discharge device with a pump can be attached. A discharge tool (not shown) can be attached. Instead of the male threaded portion 21a, the mouth portion 21 may be provided with an annular protrusion for attaching a discharge cap, a discharge tool, or the like by tapping. Moreover, the opening 21 is not limited to the cylindrical shape shown in FIG. 1A, and may be cylindrical. For example, when the discharge cap and the discharge tool are formed in the shape of a square tube or an elliptical tube, the mouth portion 21 is similarly formed in the shape of a square tube or an ellipse tube, and the discharge cap or the discharge tool is formed on the mouth portion 21. A plugging engagement may also be provided.

A neck ring 21b is provided on the outer peripheral surface of the lower portion of the mouth portion 21, as shown in FIG. 1A. The neck ring 21b extends in an annular shape over the entire circumference of the mouth portion 21 and protrudes radially outward from the outer peripheral surface of the mouth portion 21 .

The lower surface of the neck ring 21b is provided with a fitting concave portion 21d into which the fitting convex portion (the fitting peripheral wall 11a and the flange portion 11b) provided above the trunk portion 12 of the outer container body 10 is fitted. . As shown in FIG. 1B, the fitting recess 21d is recessed upward from the lower surface of the neck ring 21b. By fitting the fitting peripheral wall 11a and the flange portion 11b of the outer container body 10 into the fitting recessed portion 21d, contents spilled from the mouth portion 21 are separated from the outer container body 10 and the inner container body 20, as will be described later. can be prevented from entering between The neck ring 21b of this embodiment functions as an original neck ring by fitting the fitting peripheral wall 11a and the flange portion 11b into the fitting recess 21d. More specifically, when the preform assembly 30 is blow-molded, the lower surface of the neck ring including the flange portion 41b is abutted against the abutment surface of the blow-molding mold, so that the preform assembly is It seals the gap between 30 and the blow mold.

The accommodating portion 22 is formed in a bag-like shape that is thinner and more flexible than the trunk portion 12 of the outer container body 10 to be described later, and is detachably laminated on the inner surface of the trunk portion 12 . The interior of the storage portion 22 is a storage space S for the contents, and the storage portion 22 can be filled with the contents through the mouth portion 21, and the contents stored in the storage portion 22 can be released to the outside through the mouth portion 21. can be discharged to The containing portion 22 can be peeled off from the inner surface of the body portion 12 and deformed to reduce the volume (deformed to reduce the internal volume) as the contents are discharged.

The outer container body 10 is a portion that constitutes the outer shell of the delamination container 1, and includes a trunk portion 12 that is arranged radially outside of the housing portion 22, and a neck ring 21b that is provided above the trunk portion 12 and is fitted with the neck ring 21b. A fitting convex portion (fitting peripheral wall 11a and flange portion 11b) that fits into the concave portion 21d from below is provided.

The fitting peripheral wall 11a is a tubular portion extending upward from the body portion 12, and its upper end portion is fitted from below into a fitting recess 21d provided in the neck ring 21b. A flange portion 11b is formed radially outward from the outer peripheral surface of the fitting peripheral wall 11a, and the upper surface of the flange portion 11b is fitted into the fitting recess 21d. Thus, in this embodiment, the fitting peripheral wall 11a and the flange portion 11b are fitted from below into the fitting recess 21d formed in the lower surface of the neck ring 21b. Therefore, the mating surfaces of the outer container body 10 and the inner container body 20 are not exposed upward and laterally. Therefore, it is possible to prevent the content spilled from the upper end of the mouth portion 21 from entering between the outer container body 10 and the inner container body 20 .

As shown in FIG. 1A, the torso 12 has a torso shoulder portion 12a, a torso body portion 12b, and a torso bottom portion 12c.

The body shoulder portion 12a is integrally connected to the lower end of the fitting peripheral wall 11a, forms an upwardly convex, substantially dome shape whose diameter gradually expands downward, and protrudes radially outward from the fitting peripheral wall 11a. ing. The trunk body portion 12b is formed in a cylindrical shape, and its upper end is integrally connected to the lower end of the trunk shoulder portion 12a. The trunk bottom portion 12c is integrally connected to the lower end of the trunk main portion 12b, and has a downwardly convex substantially dome shape whose diameter gradually decreases downward to close the lower end of the trunk main portion 12b.

As shown in FIG. 1A, a tubular portion 13 is integrally provided with the trunk bottom portion 12c of the outer container body 10. As shown in FIG. In the present embodiment, the tubular portion 13 is formed in a gate portion into which material flows when forming an outer preform 40 (see FIG. 4 etc.), which is a precursor of the outer container body 10 . That is, the cylindrical portion 13 is provided using a cylindrical projection formed at the gate portion of the mold when injection molding the outer preform 40 . The cylindrical portion 13 is a portion with poor stretchability when the preform assembly 30 including the outer preform 40 is blow-molded, and does not stretch as much as the other portions. Therefore, the tubular portion 13 after blow molding generally maintains the shape before blow molding. The tubular portion 13 has a substantially cylindrical shape that is coaxial with the trunk portion 12, and its upper end is integrally connected to the lower end of the trunk portion bottom portion 12c. Protruding. The inner side of the cylindrical portion 13 forms an external air introduction path 13b that communicates with the space between the body portion 12 of the outer container body 10 and the accommodating portion 22 of the inner container body 20. As shown in FIG.

The outside air introduction path 13b is provided in the trunk bottom portion 12c, and communicates the space between the trunk portion 12 and the housing portion 22 with the outside. The outside air introduction path 13 b is open to the outside at the lower end of the cylindrical portion 13 and can introduce outside air between the body portion 12 and the housing portion 22 . In the present embodiment, as shown in FIG. 1A, the tubular portion 13 is formed to be thicker than the trunk bottom portion 12c of the trunk portion 12, so that the trunk bottom portion 12c and the tubular portion 13 It is configured such that the thickness gradually decreases upward from the connecting portion with the .

In the delamination container 1, the storage portion 22 of the inner container body 20 is separated from the outer container body 10 by introducing the outside air into the space between the body portion 12 and the storage portion 22 from the outside air introduction path 13b of the cylindrical portion 13. It can be easily peeled off from the inner surface of the trunk portion 12 . As a result, only the containing portion 22 is reduced in volume while maintaining the body portion 12 of the outer container body 10 in its original shape, and the contents contained in the containing portion 22 are poured out to the outside without being replaced with the outside air. It is possible to reduce the contact of the outside air with the contents housed in the housing part 22, thereby suppressing the deterioration, deterioration, etc. of the contents.

The upper end of the cylindrical portion 13 is covered with the housing portion 22 of the inner container body 20, and the upper end opening of the outside air introduction path 13b is closed with the housing portion bottom portion 22c of the housing portion 22 (see FIG. 1A).

In the synthetic resin delamination container 1 formed by blow molding the preform assembly 30 (see FIG. 2) in which the outer preform 40 is attached to the outside of the inner preform 50, the preform assembly 30 is blown. During molding, the stretched inner preform 50 strongly adheres to the inner surface of the outer preform 40 . In particular, the inner preform 50 strongly adheres to the inner surface of the tubular portion 43 of the outer preform 40, that is, the portion provided with the gate portion. It becomes difficult to separate from the inner surface of the portion where the tubular portion 13 is provided. On the other hand, in the delamination container 1 of the present embodiment, as shown in FIG. A predetermined gap G extending in the vertical direction is formed between them. Due to this gap G, it becomes difficult for the container bottom portion 52c of the inner preform 50 to strongly adhere to the trunk bottom portion 42c of the outer preform 40 during blow molding. Therefore, by introducing outside air at a predetermined pressure from the outside air introduction path 13 b of the lamination peeling container 1 , the accommodating part 22 can be easily peeled off from the body part 12 . Then, the outside air can be easily introduced between the trunk portion 12 and the housing portion 22 through the outside air introduction path 13b of the tubular portion 13 .

In this embodiment, as shown in FIG. 2, a predetermined gap is also provided between the side portion of the body portion 42 and the side portion of the housing portion 52. It is possible to more effectively suppress the accommodation portion 52 from coming into close contact with the trunk portion 42 .

In the delamination container 1 of the present embodiment having the above configuration, the volume of the storage space S of the storage portion 22 is about 1 liter. For example, the delamination container 1 has a discharge tool (not shown) attached to the mouth part 21 and a pressurizing device (not shown) attached to the cylindrical part 13, thereby opening the discharge opening provided in the discharge tool. It can be used as a server for automatically discharging the contents contained in the containing part 22 to the outside from the discharge port of the discharge tool only while it is open. In this case, a pressurized medium such as pressurized air is supplied as outside air between the barrel portion 12 and the housing portion 22 through the outside air introduction path 13b of the cylindrical portion 13 from the pressurizing device, is in a state of increased pressure. The pressure of the pressurized medium supplied from the pressurizing device to the outside air introduction path 13b of the cylindrical portion 13 is, for example, the content accommodated in the accommodating portion 22, which is 3 gas volumes of carbonated water (3 gas volumes per 1 liter of water). It is 10 to 20 kPa when liters of carbonic acid is absorbed into carbonated water). When the discharge port is opened in this state, the pressure presses the containing portion 22, and the content contained in the containing portion 22 is discharged from the discharge port to the outside. It is gradually peeled off from the inner surface of the trunk portion 12 and deformed to reduce its volume.

When the delamination container 1 of the present embodiment is used for the above-described server application, the pressure device extends between the body portion 12 and the housing portion 22 through the outside air introduction path 13b of the cylindrical portion 13, for example, 10 to 10 A pressurized medium such as pressurized air is supplied as outside air at a pressure of 20 kPa. As a result, the body 12 and the housing 22 are separated from each other by the pressurized medium at the bottom 22c of the housing where the tight contact with the body 12 is weakened, and furthermore, the housing 22 is reduced in volume and deformed due to the use of the contents. The outer surface of the housing portion 22 can be reliably peeled from the inner surface of the trunk portion 12 by the amount of this.

In this embodiment, the cylindrical portion 13 extends downward from the body bottom portion 12c of the outer container body 10, and the outside air introduction passage 13b is formed inside the cylindrical portion 13. However, this aspect is provided. is not limited to It is sufficient that the trunk bottom portion 12c is provided with the outside air introduction passage 13b, and the cylindrical portion 13 is not necessarily provided. If the cylindrical portion 13 is not provided, for example, the outside air may be introduced through the outside air introduction passage 13b while the outside air supply port of the pressurizing device is directly pressed against the trunk bottom portion 12c.

The delaminating container 1 configured as described above can be formed by blow molding a synthetic resin preform assembly 30 shown in FIG. In this preform assembly 30, an outer synthetic resin preform 40 for forming the outer container body 10 is attached to the outside of an inner synthetic resin preform 50 for forming the inner container body 20. It has a double structure. As shown in FIG. 2, in a state where the outer preform 40 is attached to the inner preform 50, there is a vertical gap between the container bottom portion 52c of the container portion 52 and the body portion bottom portion 42c of the body portion 42. A predetermined gap G is formed in the . Note that the distance gp in FIG. 2 is the vertical distance between the container bottom portion 52c and the trunk bottom portion 42c when the gap G is formed. Further, as shown in FIG. 2, a predetermined gap is also provided in the radial direction between the body portion 42 of the outer preform 40 and the housing portion 52 of the inner preform 50 . This makes it possible to improve the releasability of the housing portion 22 from the body portion 12 after blow molding. The predetermined radial gap can be, for example, approximately 1 mm.

In addition, the distance gp can be set to about 10 mm, for example. Also, the distance gp is preferably 5 mm or more and 10 mm or less.

As shown in FIG. 3, the inner preform 50 is formed into a predetermined shape corresponding to the inner container body 20 by injection molding the same synthetic resin material as the inner container body 20 using a mold. In this embodiment, the inner preform 50 is made of polyethylene terephthalate resin like the inner container body 20 .

The inner preform 50 has a mouth portion 51 having the same shape as the mouth portion 21 of the inner container body 20 . That is, the mouth portion 51 has a cylindrical shape, and a male screw portion 51a is integrally provided on the outer peripheral surface thereof. The male threaded portion 51 a is provided so as to protrude radially outward from the outer peripheral surface of the mouth portion 51 . Below the mouth portion 51, a substantially test-tube-shaped containing portion 52 having a hemispherical bottom portion is integrally provided. As shown in FIG. 2 , the housing portion 52 is arranged inside the body portion 42 of the outer preform 40 .

A neck ring 51b is provided on the outer peripheral surface of the lower portion of the mouth portion 51, as shown in FIG. The neck ring 51 b extends in an annular shape over the entire circumference of the mouth portion 51 and protrudes radially outward from the outer peripheral surface of the mouth portion 51 .

A fitting recess 51d is provided on the lower surface of the neck ring 51b. A fitting convex portion (fitting peripheral wall 41a and flange portion 41b) provided above the body portion 42 of the outer preform 40 is fitted into the fitting recess 51d. As shown in FIG. 3, the fitting recess 51d is recessed upward from the lower surface of the neck ring 51b, and the fitting peripheral wall 41a and the flange portion 41b of the outer preform 40 are fitted into the fitting recess 51d. Thus, as will be described later, it is possible to prevent the content spilled from the mouth portion 21 of the delaminating container 1 from entering between the outer container body 10 and the inner container body 20 .

A fitting cylindrical portion 51e that fits into the inner surface of the fitting peripheral wall 41a of the outer preform 40 and continues to the housing portion 52 is provided directly below the neck ring 51b.

As shown in FIG. 4, the outer preform 40 is formed into a predetermined shape corresponding to the outer container body 10 by injection molding the same synthetic resin material as the outer container body 10 using a mold. In this embodiment, the outer preform 40 is made of polyethylene terephthalate resin like the outer container body 10 .

The outer preform 40 is arranged radially outward of the housing portion 52, and is provided above the substantially test tube-shaped trunk portion 42 having a hemispherical bottom portion (body portion bottom portion 42c) and the trunk portion 42, A fitting projection (fitting peripheral wall 41a and flange 41b) that fits into the fitting recess 51d of the neck ring 51b from below is provided. A cylindrical tubular portion 43 is provided in a trunk portion bottom portion 42 c of the trunk portion 42 . In the present embodiment, the cylindrical portion 43 uses a portion (cylindrical projection) that is formed at the gate portion of the mold when the outer preform 40 is molded by injection molding. The blocked portion is cut out by post-processing to form a cylindrical shape (the cut-out portion in post-processing is indicated by a two-dot chain line). In addition, in the step of cutting the cylindrical portion 43, the cylindrical portion 43 formed in the gate portion has a weakened portion, and is cut at the weakened portion so that it can be easily adjusted to an appropriate length. may Note that the cylindrical portion 43 may be formed at a portion other than the gate portion of the mold.

As shown in FIG. 2, the fitting tubular portion 51e of the inner preform 50 is fitted to the inner surface of the fitting peripheral wall 41a of the outer preform 40, and the fitting convex portion (the fitting peripheral wall 41a and the flange) of the outer preform 40 is fitted. The outer preform 40 is positioned radially and vertically with respect to the inner preform 50 by fitting the portion 41 b) into the fitting recess 51 d of the inner preform 50 . At this time, as shown in FIG. 2, a predetermined space G is formed in the vertical direction between the housing bottom portion 52c of the housing portion 52 and the body portion bottom portion 42c of the body portion 42. As shown in FIG. In addition, it is sufficient that a gap is provided in at least one of the radial direction and the vertical direction between the housing portion 52 and the body portion 42 .

The fitting peripheral wall 41a is a tubular portion extending upward from the trunk portion 42, and its upper end portion is fitted from below into a fitting recess 51d provided in the neck ring 51b. A flange portion 41b is formed radially outward from the outer peripheral surface of the fitting peripheral wall 41a, and the flange portion 41b is fitted into the fitting recess 51d. Thus, in this embodiment, the fitting peripheral wall 41a and the flange portion 41b are fitted from below into the fitting recess 51d formed in the lower surface of the neck ring 51b. Therefore, in the delaminated container 1 formed by blow-molding the preform assembly 30, the mating surfaces of the outer container body 10 and the inner container body 20 are not exposed upward and laterally. Therefore, it is possible to prevent the content spilled from the upper end of the mouth portion 21 from entering between the outer container body 10 and the inner container body 20 .

Next, a method for manufacturing the delamination container 1 according to this embodiment will be described in detail using the flowchart shown in FIG.

When manufacturing the delaminating container 1, first, the inner preform 50 constituting the preform assembly 30 is formed (step S101). The inner preform 50 includes a tubular mouth portion 51 , a neck ring 51 b provided below the mouth portion 51 , and a housing portion 52 connected to the mouth portion 51 . In this embodiment, the inner preform 50 is formed by injection molding polyethylene terephthalate resin. The accommodating portion 52 constitutes an extending portion extending downward and radially outward together with the body portion 42 of the outer preform 40 by blow molding, which will be described later.

Also, an outer preform 40 that constitutes the preform assembly 30 is formed (step S103). As described above, the outer preform 40 includes the trunk portion 42 arranged radially outside the accommodating portion 52 and the fitting convex portion ( A fitting peripheral wall 41a and a flange portion 41b) are provided, and a cylindrical portion 43 is formed in a trunk portion bottom portion 42c of the trunk portion 42. As shown in FIG. In this embodiment, the outer preform 40 is formed by injection molding polyethylene terephthalate resin. The trunk portion 42 constitutes an extending portion extending downward and radially outward together with the containing portion 52 of the inner preform 50 by blow molding, which will be described later.

After the outer preform 40 is formed by injection molding, the lower end portion (outer portion) of the cylindrical portion 43 formed on the bottom portion 42c of the trunk portion 42 is cut off by post-processing (see FIG. 4), and the outside air is introduced. A path 43b is formed (step S105).

Note that the formation of the inner preform 50 (step S101) and the formation of the outer preform 40 (steps S103 and S105) can be performed independently, and the order of the steps does not matter.

Next, the outer preform 40 is fitted from below the inner preform 50 to construct the preform assembly 30 shown in FIG. 2 (step S107). The outer diameter of the fitting cylindrical portion 51e of the inner preform 50 corresponds to the inner diameter of the fitting peripheral wall 41a of the outer preform 40, and the fitting allows the outer preform 40 to move radially relative to the inner preform 50. is positioned at In addition, the outer preform 40 is fitted to the inner preform 50 by fitting the fitting convex portion (the fitting peripheral wall 41a and the flange portion 41b) of the outer preform 40 into the fitting recess portion 51d of the inner preform 50 from below. Positioning is also performed in the vertical direction. In this manner, when the outer preform 40 is vertically positioned with respect to the inner preform 50, the container bottom portion 52c of the container portion 52 and the body portion bottom portion 42c of the body portion 42 are vertically separated from each other. As a result, a predetermined gap G is formed as shown in FIG.

In the present embodiment, the outer preform 40 is brought close to the fixed inner preform 50 from below, and the fitting peripheral wall 41a is fitted to the outer peripheral surface of the fitting cylindrical portion 51e, whereby the preform assembly 30 is However, it is not limited to this aspect. The inner preform 50 may be fitted into the inner space of the fixed outer preform 40 from above. Alternatively, the preform assembly 30 may be constructed by insert molding or two-color molding. The "preform assembly 30 in which the outer preform 40 is attached to the outer side of the inner preform 50" is a concept that includes all the above cases.

Next, the delaminating container 1 shown in FIG. 1A is manufactured by blow molding the preform assembly 30 having the above configuration (step S109). In this embodiment, biaxial stretch blow molding is employed as blow molding.

More specifically, in the biaxial stretch blow molding of the preform assembly 30, first, a mold for blow molding (not shown) constituting a blow molding apparatus is provided, and the mouth portion 51 protrudes from the cavity of the mold. At the same time, the preform assembly 30 is set so that the neck ring 51b is supported on the upper surface of the mold and the body portion 42 and the housing portion 52 are positioned inside the cavity. In this state, a pressurized medium such as pressurized air or pressurized liquid is supplied to the inside of the preform assembly 30 through the mouth portion 51 while the body portion 42 and the housing portion 52 are stretched in the axial direction by the stretching rod. The portion 42 and the housing portion 52 are blow-molded into a shape along the inner surface of the cavity. Thus, the preform assembly 30 in which the outer preform 40 formed by injection molding is mounted on the outside of the inner preform 50 formed by injection molding is subjected to biaxial stretch blow molding to obtain a laminate having the above configuration. The peeling container 1 can be manufactured easily.

In this blow molding, the body portion 42 of the outer preform 40 and the housing portion 52 of the inner preform 50 are stretched in the vertical direction (the direction of the axis O) and in the radial direction, respectively. The portion provided with the portion 43 is poor in stretchability and does not stretch like other portions, so that the cylindrical portion 13 maintains substantially the same shape as the preform assembly 30 even after molding. be able to. The body portion 42 and the housing portion 52 are stretched downward along the axis O and radially outward by blow molding. It is pushed downward and radially outward by 52c. Therefore, since the trunk bottom portion 42c is less likely to be directly pressed by the housing portion bottom portion 52c, it is possible to prevent the inner preform 50 from strongly adhering to the inner surface of the outer preform 40 and becoming difficult to peel off.

As described above, the present embodiment is the preform assembly 30 in which the outer preform 40 is attached to the outer side of the inner preform 50. The inner preform 50 includes the tubular mouth portion 51 and the mouth portion 51. The outer preform 40 has a neck ring 51b provided in the lower portion of the portion 51, and a housing portion 52 continuing below the mouth portion 51. The outer preform 40 includes a body portion 42 arranged radially outside the housing portion 52, and a fitting projection that fits into a fitting recess 51d that is recessed upward from the lower surface of the neck ring 51b. , the outside air introduction path 43b is provided. By adopting such a configuration, in the delaminated container 1 formed by blow molding the preform assembly 30, the mating surfaces of the outer container body 10 and the inner container body 20 are not exposed upward and laterally. . In addition, outside air can be introduced between the body portion 12 and the housing portion 22 through an outside air introduction path 13b provided in the body portion bottom portion 12c away from the mouth portion 21 . Therefore, it is possible to prevent the content spilled from the upper end of the mouth portion 21 from entering between the outer container body 10 and the inner container body 20 .

Further, in this embodiment, the fitting convex portion is configured to have a flange portion 41b radially extending from above the body portion 42 along the neck ring 51b. By adopting such a configuration, the mating surface between the outer container body 10 and the inner container body 20 can be provided long in the radial direction along the neck ring 51b. can be suppressed to

Further, in the present embodiment, the outside air introduction path 13b is configured to be formed in the gate portion of the mold into which the material flows when the outer preform 40 is molded. By adopting such a configuration, since the outside air introduction path 13b is formed using the gate portion which is absolutely necessary when injection molding the outer preform 40, there is no influence on the portions other than the gate portion of the delamination container 1. Outside air can be easily introduced into the space between the body portion 12 and the housing portion 22 without providing a

Further, in this embodiment, a gap is provided between the body portion 42 and the housing portion 52 in at least one of the radial direction and the vertical direction. By adopting such a configuration, it is possible to prevent the inner preform 50 from coming into close contact with the outer preform 40 during blow molding and becoming difficult to separate.

Further, in this embodiment, the outer preform 40 and the inner preform 50 are each made of polyethylene terephthalate resin. By adopting such a configuration, the delamination container 1 can be made lightweight and highly transparent.

Further, the present embodiment is a synthetic resin delamination container 1 formed by blow molding a preform assembly 30 in which an outer preform 40 is attached to the outside of an inner preform 50, and has a tubular shape. An inner container body 20 having a mouth portion 21, a neck ring 21b provided at the lower portion of the mouth portion 21, and a volume-reducing and deformable accommodating portion 22 continuous below the mouth portion 21; An outer container body 10 having a body portion 12 disposed thereon and a fitting convex portion that is provided above the body portion 12 and fits into a fitting concave portion 21d that is recessed upward from the lower surface of the neck ring 21b. The body portion bottom portion 12c of the body portion 12 of the container body 10 is configured to be provided with an outside air introduction path 13b. By adopting such a configuration, the mating surfaces of the outer container body 10 and the inner container body 20 of the delaminating container 1 are not exposed upward and laterally. In addition, outside air can be introduced between the body portion 12 and the housing portion 22 through an outside air introduction path 13b provided in the body portion bottom portion 12c away from the mouth portion 21 . Therefore, it is possible to prevent the content spilled from the upper end of the mouth portion 21 from entering between the outer container body 10 and the inner container body 20 .

Further, the present embodiment is a method for manufacturing a synthetic resin delaminating container 1 formed by blow molding a preform assembly 30 in which an outer preform 40 is attached to the outside of an inner preform 50, a step of forming an inner preform 50 having a cylindrical mouth portion 51, a neck ring 51b provided at the lower portion of the mouth portion 51, and a housing portion 52 continuing below the mouth portion 51; An outer preform 40 is formed having a trunk portion 42 arranged outside and a fitting projection portion that is provided above the trunk portion 42 and fits into a fitting recess portion 51d that is recessed upward from the lower surface of the neck ring 51b. mounting the outer preform 40 on the outside of the inner preform 50 to form a preform assembly 30; blow molding the preform assembly 30; The bottom portion 42c of the body portion of 42 is configured to be provided with an outside air introduction passage 43b. By adopting such a configuration, in the delaminated container 1 formed by blow molding the preform assembly 30, the mating surfaces of the outer container body 10 and the inner container body 20 are not exposed upward and laterally. . In addition, outside air can be introduced between the body portion 12 and the housing portion 22 through an outside air introduction path 13b provided in the body portion bottom portion 12c away from the mouth portion 21 . Therefore, it is possible to prevent the content spilled from the upper end of the mouth portion 21 from entering between the outer container body 10 and the inner container body 20 .

Although the present disclosure has been described with reference to figures and examples, it should be noted that various variations and modifications will be readily apparent to those skilled in the art based on the present disclosure. Therefore, it should be noted that these variations and modifications are included in the scope of the present invention. For example, the functions included in each component can be rearranged so as not to be logically inconsistent, and multiple components can be combined into one or divided. It should be understood that the scope of the present invention includes these.

For example, in the present embodiment, the outer container body 10 has a dome-like shape in which the trunk bottom portion 12c protrudes downward. The shape can be changed in various ways.

In addition, the material of the outer container body 10 is not limited to polyethylene terephthalate resin. etc.), polycarbonate resin (PC), cycloolefin copolymer resin (COC), cycloolefin polymer resin (COP), and other synthetic resin materials can also be employed.

Furthermore, the material of the inner container body 20 is not limited to polyethylene terephthalate resin. etc.), polycarbonate resin (PC), cycloolefin copolymer resin (COC), cycloolefin polymer resin (COP), ethylene-vinyl alcohol copolymer resin (EVOH), and other synthetic resin materials can also be employed. When EVOH is used as the material for the inner container body 20, one having an appropriate ethylene content can be adopted in consideration of barrier properties and flexibility. Further, the inner container body 20 may have a multi-layer structure in which a barrier layer such as an MXD6 layer is provided between a pair of polyethylene terephthalate resin layers in order to ensure barrier properties.

Furthermore, the inner container body 20 may be configured to have a gas barrier film such as a silica deposited film or a DLC film provided on the inner surface thereof. By providing a gas barrier film on the inner surface of the inner container body 20, the gas barrier property of the delamination container 1 is enhanced, and when a gas-containing beverage such as carbonated water is contained as the content, the gas can be prevented from escaping from the gas-containing beverage. can be suppressed.

Furthermore, in the present embodiment, the delamination container 1 is used as a server with a discharge tool and a pressurizing device attached. is attached to the mouth portion 21 and the body portion 12 is squeezed to discharge the contents. The present disclosure can also be applied to a delaminating container used for various purposes, such as a container with a pump in which a pump-type discharge tool is attached to the mouth portion 21 .

In addition, in the present embodiment, the cylindrical portion 13 is formed using the protrusion formed in the gate portion when the outer preform 40 is formed by injection molding, but the present invention is not limited to this aspect. . The tubular portion 13 may be formed in a region other than the gate portion.

In addition, in the present embodiment, the fitting convex portion is configured as the fitting peripheral wall 11a and the flange portion 11b, but it is not limited to this aspect, and other configurations that fit into the neck ring 21b from below may be used. good.

1 Delamination container 10 Outer container body 11a Fitting peripheral wall (fitting convex part)
11b flange (fitting projection)
12 Body portion 12a Body portion shoulder portion 12b Body portion main portion 12c Body portion bottom portion 13 Cylindrical portion 13b Outside air introduction path 20 Inner container body 21 Mouth portion 21a Male screw portion 21b Neck ring 21d Fitting concave portion 22 Accommodating portion 22c Accommodating portion bottom Portion 30 Preform assembly 40 Outer preform 41a Fitting peripheral wall 41b Flange portion 42 Body portion 42c Body bottom portion 43 Cylindrical portion 43b Outside air introduction passage 50 Inner preform 51 Mouth portion 51a Male screw portion 51b Neck ring 51d Fitting concave portion 51e Fitting cylindrical portion 52 Accommodating portion 52c Accommodating portion bottom portion G Gap gp Distance O Axis S Accommodating space

Claims (7)

A preform assembly in which an outer preform is attached to the outside of an inner preform,
The inner preform has a tubular mouth, a neck ring provided at the bottom of the mouth, and a housing section that continues below the mouth,
The outer preform includes a body portion arranged radially outward of the accommodating portion, and a fitting protrusion provided above the body portion and fitted into a fitting recess recessed upward from the lower surface of the neck ring. and
A preform assembly, wherein an outside air introduction path is provided in the bottom portion of the body of the outer preform. 2. The preform assembly according to claim 1, wherein said fitting convex portion has a flange portion extending radially along said neck ring from above said body portion. 3. The preform assembly according to claim 1, wherein said outside air introduction path is formed in a gate portion of a mold into which material flows when molding said outer preform. The preform assembly according to any one of claims 1 to 3, wherein a gap is provided in at least one of the radial direction and the vertical direction between the body portion and the accommodating portion. The preform assembly according to any one of claims 1 to 4, wherein said outer preform and said inner preform are each made of polyethylene terephthalate resin. A delaminating container made of synthetic resin,
an inner container body having a cylindrical mouth, a neck ring provided at the lower part of the mouth, and a volume-reducing and deformable accommodating part connected to the lower part of the mouth;
An outer container body having a body portion arranged radially outward of the accommodating portion, and a fitting convex portion provided above the body portion and fitted into a fitting concave portion recessed upward from the lower surface of the neck ring. and
A delamination container, wherein an outside air introduction path is provided in the bottom portion of the trunk portion of the outer container body. A method for manufacturing a synthetic resin delaminated container formed by blow molding a preform assembly in which an outer preform is attached to the outside of an inner preform, comprising:
a step of forming an inner preform having a cylindrical mouth, a neck ring provided at the bottom of the mouth, and an accommodating portion continuing below the mouth;
An outer preform having a body portion disposed radially outward of the accommodating portion, and a fitting protrusion provided above the body portion and fitted into a fitting recess recessed upward from the lower surface of the neck ring. forming a
forming a preform assembly by attaching the outer preform to the outside of the inner preform;
and blow molding the preform assembly;
A method for manufacturing a delamination container, wherein an outside air introduction path is provided in the bottom portion of the body portion of the outer preform.

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