JP2020055534A - Delamination container - Google Patents

Abstract

To provide a delamination container capable of easily removing a storage part of an inner container from inner of a part where a gate part of an outer container is provided.SOLUTION: A synthetic resin delamination container 1 formed by blow molding a preform assembly 30 incorporating an inner preform 50 inside an outer preform 40 includes an outer container 10 having a cylindrical outer mouth part 11 and a body part 12 connected to the outer mouth part 11, an inner container 20 having a cylindrical inner mouth part 21 disposed inside the outer mouth part 11 and a storage part 22 removably laminated on an inner face of the body part 12 in a peelable manner, and a cylindrical gate part 13 having an outside air introduction channel 13b connected between the body part 12 and the storage part 22 inside and integrally and continuously provided on the body part 12. The delamination container 1 is characterized in that a whitened part 23 is provided at a part facing the gate part 13 of the storage part 22.SELECTED DRAWING: Figure 1

Description

  TECHNICAL FIELD The present invention relates to a laminate release container made of synthetic resin.

  As a container for storing food seasonings such as soy sauce, beverages, cosmetics, shampoo, rinse, liquid soap, etc. as a content liquid, by blow molding a preform assembly incorporating the inner preform inside the outer preform An outer container body having a cylindrical outer opening and a body connected to the outer opening, and a cylindrical inner opening disposed inside the outer opening and an inner surface of the body releasably laminated. Inner container body having a volume-reducing and deformable storage portion, and a cylindrical gate provided integrally with the body portion with an outside air introduction passage communicating between the body portion and the storage portion inside. And a laminated peeling container (delamination container) made of a synthetic resin and formed in a double structure having a portion (see, for example, Patent Document 1).

  In such a laminated peeling container, the accommodating portion of the inner container body can be peeled from the inner surface of the trunk portion of the outer container body by introducing outside air from the gate portion. With this, it is possible to reduce the volume of only the housing portion of the inner container body while maintaining the outer container body in the original shape and to pour the content liquid stored in the housing portion to the outside without replacing it with the outside air. Therefore, it is possible to reduce the contact of the outside liquid with the contents liquid stored in the storage section, and to suppress the deterioration, deterioration and the like of the contents liquid.

  In addition, such a laminated peeling container can be used as a server by, for example, attaching a discharging device to an outer opening and attaching a pressurizing device to a gate. In this case, a pressurized medium such as pressurized air is supplied between the body and the housing through the outside air introduction path of the gate from the pressurizing device, and the pressure between the body and the housing is increased. By doing so, the content liquid can be automatically discharged from the discharge port to the outside only while the discharge port provided in the discharge tool is opened.

JP 2014-28627 A

  However, in the conventional lamination release container, when the preform assembly in which the inner preform is incorporated inside the outer preform is blow-molded, the stretched inner preform has a portion where the gate portion of the outer preform is provided. However, there is a problem that the container portion of the inner container body may not be peeled off from the inner surface of the portion of the outer container body provided with the gate portion.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide a laminated structure in which a housing portion of an inner container body can be easily separated from an inner surface of a portion provided with a gate portion of an outer container body. It is to provide a peeling container.

  The laminated peeling container of the present invention is a synthetic resin laminated peeling container formed by blow molding a preform assembly incorporating the inner preform inside the outer preform, and having a cylindrical outer opening. An outer container body having a body connected to the outer opening, a cylindrical inner opening disposed inside the outer opening, and a reduction stack releasably laminated on the inner surface of the body. An inner container body having a deformable housing portion, and a tubular shape provided inside the outside air introduction passage communicating between the body portion and the housing portion, and provided integrally with the body portion. And a whitening portion is provided in a portion of the housing portion facing the gate portion.

  In the laminate peeling container of the present invention, in the above-described configuration, it is preferable that the outer container body and the inner container body are each made of polyethylene terephthalate resin.

In the laminate peeling container of the present invention, in the above-described configuration, it is preferable that the density of the whitened portion is 1.35 g / cm ³ or more.

  In the laminate peeling container of the present invention, in the above configuration, it is preferable that the gate portion has a cylindrical shape, and the whitening portion has an outer circular shape having a larger diameter than the gate portion.

  In the laminated peeling container of the present invention, in the above-mentioned configuration, the trunk portion includes a trunk shoulder portion integrally connected to the outer opening portion, a trunk body portion integrally connected to the trunk shoulder portion, and the trunk body. A torso bottom portion integrally connected to the portion, wherein the gate portion is provided at the torso bottom portion, and the whitening portion is in a range opposed to the torso bottom portion of the housing portion. It is preferably provided.

  ADVANTAGE OF THE INVENTION According to this invention, the laminated peeling container which can peel easily the accommodating part of an inner container body from the inner surface of the part in which the gate part of the outer container body was provided can be provided.

It is a half sectional view of a lamination exfoliation container which is one embodiment of the present invention. It is a bottom view of the lamination peeling container shown in FIG. It is an expanded sectional view of the part in which the gate part of the laminated peeling container shown in FIG. 1 was provided. It is sectional drawing which shows the state which the pressurization medium was supplied from the gate part, and the accommodating part peeled from the inner surface of the trunk | drum bottom part. FIG. 2 is a side view showing a preform assembly for forming the laminated peeling container shown in FIG. 1 with a part thereof cut away. FIG. 6 is a half sectional view of the outer preform shown in FIG. 5. FIG. 6 is a side view showing the inner preform shown in FIG. 5 with a part thereof cut away. It is a bottom view of the inner preform shown in FIG. It is explanatory drawing which shows the structure of a whitening apparatus schematically.

  Hereinafter, the laminated peeling container 1 according to an embodiment of the present invention will be described more specifically with reference to the drawings.

  In the present specification and the appended claims, the up-down direction means the up-down direction in a state in which the laminated peeling container 1 is in an upright posture as shown in FIG. This means a direction along a straight line passing through one axis O and perpendicular to the axis O.

  A lamination release container 1 according to an embodiment of the present invention shown in FIGS. 1 and 2 is a delamination container formed by blow molding a preform assembly in which an inner preform is incorporated inside an outer preform. It is made of a synthetic resin, also called a delamination container. The laminate peeling container 1 has a double structure including an outer container body 10 and an inner container body 20 provided inside the outer container body 10.

  In the present embodiment, both the outer container body 10 and the inner container body 20 are made of polyethylene terephthalate resin (PET). By forming the outer container body 10 and the inner container body 20 from polyethylene terephthalate resin, respectively, the laminate peeling container 1 can be made a lightweight and highly transparent container.

  The outer container body 10 is a portion constituting an outer shell of the laminated peeling container 1, and has a bottle shape provided with an outer opening 11 and a body 12 integrally connected to a lower end of the outer opening 11.

  The outer opening 11 has a cylindrical shape, and a projection 11a is integrally provided on an outer peripheral surface thereof. The protrusion 11 a extends annularly over the entire circumference of the outer opening 11 and protrudes radially outward from the outer peripheral surface of the outer opening 11. A discharge tool (not shown) such as a discharge cap having a discharge port or a discharge tool with a pump can be attached to the outer opening 11 by engaging the protrusion 11a with an undercut.

  A neck ring 11b is integrally provided on the outer peripheral surface of the outer opening 11 with a space below the protrusion 11a. The neck ring 11b extends in an annular shape over the entire circumference of the outer opening 11 and protrudes radially outward from the outer peripheral surface of the outer opening 11.

  The outer opening 11 is not limited to a cylindrical shape, and may be, for example, a rectangular tube or an elliptical tube as long as it is cylindrical. Further, the outer opening 11 may be provided with a male screw in place of the protrusion 11a, and the discharge device may be screwed and mounted on the male screw.

  The trunk 12 has a trunk shoulder 12a, a trunk main body 12b, and a trunk bottom 12c.

  The torso shoulder portion 12a is integrally connected to the lower end of the outer opening portion 11, forms an upwardly convex substantially dome shape whose diameter gradually increases downward, and projects radially outward with respect to the outer opening portion 11. ing. The torso main body portion 12b is formed in a cylindrical shape, and is integrally connected to a lower end of the torso shoulder portion 12a at an upper end thereof. The torso bottom portion 12c is integrally connected to the lower end of the torso body portion 12b, and has a substantially downwardly convex substantially dome shape whose diameter gradually decreases downward, thereby closing the lower end of the torso body portion 12b.

  The inner container body 20 includes an inner opening 21 and a housing 22 integrally connected to a lower end of the inner opening 21.

  The inner opening 21 has a cylindrical shape with a smaller diameter than the outer opening 11, and is arranged inside the outer opening 11 in close contact with the inner surface of the outer opening 11. At the upper end of the inner opening 21, a folded portion 21 a that is folded outward in the radial direction is provided integrally and continuously. The folded portion 21a covers the upper end of the outer opening 11, whereby the space between the outer opening 11 and the inner opening 21 is closed to the outside.

  The inner opening 21 is not limited to a cylindrical shape, and may be a cylindrical shape. For example, when the outer opening 11 is formed in a square tubular shape or an elliptical tubular shape, the inner mouth portion 21 is similarly formed in a square tubular shape or an elliptical tubular shape.

  The accommodating portion 22 is formed in a thinner and more flexible bag shape than the trunk portion 12 of the outer container body 10, and is laminated on the inner surface of the trunk portion 12 so as to be peelable. The inside of the storage section 22 is a storage space S for the content liquid, and the storage section 22 can be filled with the content liquid through the inner opening 21 and the content liquid stored in the storage section 22 through the inner opening 21. Can be discharged to the outside. The accommodating portion 22 can be reduced in volume (deformed so as to reduce the internal volume) while being peeled off from the inner surface of the body portion 12 with the discharge of the content liquid.

  A gate portion 13 is provided integrally with the body bottom portion 12c of the outer opening portion 11. The gate portion 13 has a substantially cylindrical shape coaxial with the outer opening portion 11, and is integrally connected at an upper end thereof to a lower end of the trunk bottom portion 12 c and protrudes downward from a lower end of the trunk bottom portion 12 c. A tapered portion 13a whose diameter is reduced downward is provided at a lower end portion of the gate portion 13. The inside of the gate portion 13 is an outside air introduction passage 13b communicating between the body portion 12 of the outer container body 10 and the accommodation portion 22 of the inner container 20. The outside air introduction passage 13b is open to the outside at the lower end of the gate portion 13, so that outside air can be introduced between the body portion 12 and the accommodation portion 22.

  The laminate peeling container 1 introduces the outside air between the body portion 12 and the housing portion 22 from the outside air introduction passage 13 b of the gate portion 13, thereby causing the housing portion 22 of the inner container 20 to move to the body portion 12 of the outer container body 10. Can be easily peeled off from the inner surface. As a result, only the storage part 22 is reduced in volume while maintaining the body part 12 of the outer container body 10 in the original shape, and the content liquid stored in the storage part 22 is poured to the outside without being replaced with outside air. It is possible to reduce the contact of the outside liquid with the contents liquid stored in the storage section 22 and to suppress the deterioration or deterioration of the contents liquid.

  The body 12 may have a configuration in which a plurality of concave ribs 14 are provided on the body bottom portion 12c. In the present embodiment, eighteen concave ribs 14 are provided radially at equal intervals in the circumferential direction around the gate portion 13 on the trunk bottom portion 12c. By providing a plurality of concave ribs 14 in the trunk bottom portion 12c, it is easy to secure an air passage of the outside air from the outside air introduction path 13b through the trunk bottom portion 12c and between the trunk body main portion 12b and the housing portion 22. Thus, the housing portion 22 can be more reliably separated from the trunk portion 12. In FIGS. 1 and 2, only one concave rib 14 is denoted by a reference numeral for convenience. As shown in FIG. 2, four recesses 15 are provided at regular intervals in the circumferential direction in a portion of the body bottom portion 12 c between the gate portion 13 and the plurality of concave ribs 14. Each recess 15 extends in the circumferential direction around the axis of the gate 13 and is recessed toward the inside of the body 12. By providing a plurality of recesses 15 in a portion of the body bottom portion 12c between the gate portion 13 and the plurality of recessed ribs 14, the outside air introduced from the outside air introduction passage 13b of the gate portion 13 is passed through the recessed ribs 15. The housing portion 22 can be more reliably peeled off from the body portion 12 by allowing the housing portion 22 to easily flow to the body portion 12.

  The upper end of the gate 13 is covered by the housing 22 of the inner container 20, and the upper end opening of the outside air introduction passage 13 b is closed by the housing 22.

  A whitening portion 23 is provided in a portion of the storage portion 22 facing the gate portion 13. The whitening part 23 is provided by partially heating the storage part 22 made of synthetic resin to a predetermined temperature and subjecting a part of the storage part 22 to whitening processing (crystallization processing).

  In the synthetic resin lamination release container 1 formed by blow molding a preform assembly in which the inner preform is incorporated inside the outer preform, the stretched inner mold is blown when the preform assembly is blow molded. The reforming strongly adheres to the inner surface of the portion of the outer preform where the gate portion is provided, and the accommodating portion 22 of the inner container 20 after molding is peeled from the inner surface of the body portion 12 where the gate portion 13 is provided. It becomes difficult. On the other hand, in the laminated peeling container 1 of the present embodiment, as shown in FIG. The peel resistance of the portion facing the inner surface of the body 12 can be reduced. Therefore, by introducing the outside air between the trunk bottom portion 12c and the housing portion 22 through the outside air introduction passage 13b of the gate portion 13, the gate portion 13 of the trunk portion 12 of the housing portion 22, as shown in FIG. The opposing portion can be easily separated from the inner surface of the body portion 12.

  As shown in FIG. 2, in the present embodiment, the whitening portion 23 has a larger outer circular shape than the gate portion 13 and is arranged coaxially with the gate portion 13. This ensures that the portion of the trunk bottom portion 12c where the gate portion 13 is provided faces the whitening portion 23, and the portion of the housing portion 22 that faces the gate portion 13 of the trunk portion 12 is moved to the trunk portion. 12 can be more reliably and easily separated from the inner surface.

  Since the whitened portion 23 is crystallized and becomes harder than other portions of the non-crystallized storage portion 22, if the whitened portion 23 is provided over a wide area of the storage portion 22, the volume of the storage portion 22 is reduced. There is a possibility that a problem that deformation becomes difficult occurs. Therefore, it is preferable that the whitening portion 23 is provided in a range opposed to the trunk bottom portion 12c of the storage portion 22. In the present embodiment, the whitening portion 23 has a slightly larger diameter than the gate portion 13 and is formed in an outer circular shape having a diameter sufficiently smaller than the trunk bottom portion 12c. As described above, by providing the whitening portion 23 only in a range opposed to the trunk bottom portion 12c of the storage portion 22, the storage portion 22 can be reliably reduced in volume with the discharge of the content liquid while the storage portion 22 is deformed. The portion of the body 12 facing the gate 13 can be reliably separated from the inner surface of the body 12.

  When four recesses 15 are provided at regular intervals in the circumferential direction at a portion between the gate portion 13 and the plurality of concave ribs 14 of the body bottom portion 12c as in the present embodiment, the whitening portion 23 Is preferably formed in a circular shape having an outer diameter whose outer peripheral edge overlaps with the concave portion 15. Thus, the portion of the housing 22 facing the gate 13 of the body 12 can be more reliably and easily peeled off from the inner surface of the body 12.

By crystallization, the whitening portion 23 has a higher density than the non-crystallized portion of the storage portion 22 other than the whitening portion 23. When the outer container body 10 and the inner container body 20 are made of polyethylene terephthalate as in the laminated peeling container 1 of the present embodiment, it is preferable that the density of the whitened portion 23 is 1.35 g / cm ³ or more. . By setting the density of the whitening portion 23 to 1.35 g / cm ³ or more, the peeling resistance of the whitening portion 23 to the inner surface of the body 12 is sufficiently reduced, and the accommodating portion 22 is reliably peeled from the inner surface of the body 12. Can be done.

In the present embodiment, a portion having a density of 1.35 g / cm ³ or more, which is provided in a portion of the storage portion 22 facing the gate portion 13, is defined as the whitening portion 23.

  Note that the area, shape, density, and the like of the whitening portion 23 are not limited to those described above, and various areas, shapes, and densities can be used as long as they are provided in portions facing the gate portion 13.

  In the laminated peeling container 1 of the present embodiment having the above-described configuration, for example, a discharge tool (not shown) for closing the inner opening 21 is attached to the outer opening 11, and the pressurizing device (not shown) is connected to the gate unit 13. Is used as a server that automatically discharges the content liquid stored in the storage portion 22 from the discharge port of the discharge tool to the outside only while the discharge port provided in the discharge tool is opened by being attached to the discharge tool. can do. In this case, a pressurized medium such as pressurized air is supplied as outside air between the body 12 and the housing 22 through the outside air introduction passage 13b of the gate 13 from the pressurizing device, and the pressure between the body 12 and the housing 22 is increased. During this time, the pressure is increased. The pressure of the pressurized medium supplied from the pressurizing device to the outside air introduction passage 13b of the gate unit 13 is, for example, a method in which the content liquid stored in the storage unit 22 is converted into 3 gas volumes of carbonated water (3 liters in 1 liter of water). (Carbonated water in which carbonic acid is absorbed). Then, when the discharge port is opened in this state, the container 22 is pressed by the pressure, and the content liquid stored in the container 22 is discharged from the discharge port to the outside, and the container 22 is discharged with the discharge. It gradually peels off from the inner surface of the body portion 12 and is deformed to reduce its volume.

  In the laminated peeling container 1 of the present embodiment, the whitening portion 23 is provided in the portion of the storage portion 22 facing the gate portion 13. By supplying a pressurized medium such as pressurized air as outside air at a pressure of, for example, 10 to 20 kPa between the body portion 12 and the housing portion 22 through the outside air introduction path 13b of FIG. The portion of the storage section 22 facing the gate section 13 can be reliably separated from the inner surface of the body section 12 by the pressure of the pressurized medium.

  The laminated peeling container 1 having the above configuration can be formed by blow molding the preform assembly 30 made of a synthetic resin shown in FIG. The preform assembly 30 includes a synthetic resin inner preform 50 for forming the inner container body 20 inside a synthetic resin outer preform 40 for forming the outer container body 10. It has a heavy structure.

  As shown in FIG. 6, 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 the present embodiment, the outer preform 40 is made of polyethylene terephthalate resin similarly to the outer container body 10.

  The outer preform 40 has an outer opening 41 having the same shape as the outer opening 11 of the outer container body 10. That is, the outer opening 41 has a cylindrical shape, and an annular projection 41a and a neck ring 41b are integrally provided on the outer peripheral surface thereof. At the lower end of the outer opening 41, a substantially test tubular outer extending portion 42 having a hemispherical bottom is integrally provided. At the lower end of the outer extending portion 42, a bottomed cylindrical gate portion forming portion 43 is integrally provided coaxially with the outer extending portion 42. The gate portion forming portion 43 is a portion formed in the gate portion 13 by cutting off a closed portion 43a provided at a lower end thereof after blow molding.

  Note that, similarly to the gate portion 13, the gate portion forming portion 43 may have a cylindrical shape with an open lower end.

  As shown in FIG. 7, 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 the present embodiment, the inner preform 50 is made of polyethylene terephthalate resin similarly to the inner container 20.

  The inner preform 50 has an inner opening 51 having the same shape as the inner opening 21 of the inner container 20. That is, the inner opening 51 has a cylindrical shape with a smaller diameter than the outer opening 41 of the outer preform 40, and is disposed coaxially with the outer opening 41 inside the outer opening 41. At an upper end of the inner opening portion 51, a folded portion 51a that is folded radially outward is provided integrally and continuously. The folded portion 51a covers the upper end of the outer opening 41, so that the space between the outer opening 41 and the inner opening 51 is closed to the outside. At the lower end of the inner opening 51, a substantially test tube-like inner extending portion 52 having a hemispherical bottom is provided integrally. As shown in FIG. 5, the inner extending portion 52 is arranged inside the outer extending portion 42 in a stacked manner.

  A whitening portion forming portion 53 is provided at a lower end of the inner extending portion 52. The whitening portion forming portion 53 is a portion that becomes the whitening portion 23 after blow molding. As shown in FIG. 8, the whitening portion forming portion 53 has a circular shape when viewed from the axial direction of the inner preform 50, and its outer diameter is smaller than the outer diameter of the gate portion forming portion 43 as shown in FIG. 5. Is also slightly larger. As described above, the whitening portion forming portion 53 is provided at a portion of the inner extending portion 52 of the inner preform 50 that faces the gate portion forming portion 43.

  The whitening part forming part 53 partially heats the hemispherical bottom of the inner stretching part 52 of the inner preform 50 to a predetermined temperature, and whitens part of the hemispherical bottom of the inner stretching part 52 (crystallizing). (Forming treatment). FIG. 9 shows an example of a whitening device 60 for forming the whitening portion forming section 53 at the bottom of the inner preform 50.

  The whitening device 60 shown in FIG. 9 has a turntable 61, and a cylindrical holding part 62 is provided on the upper surface of the turntable 61. The inner preform 50 is inserted into the inside of the holding part 62 in an inverted posture with the bottom part directed upward, and is arranged on the turntable 61 with the bottom part projected upward from the upper end of the holding part 62. In FIG. 9, the inner preform 50 is shown in a simplified configuration. The inner preform 50 rotates the turntable 61 about the rotation axis 61a as the turntable 61 rotates about the rotation axis 61a. The turntable 61 is provided with a heat shield plate 63 that covers the outside of the holding portion 62, and an outer periphery of a bottom portion protruding above the holding portion 62 of the inner preform 50 by an umbrella-shaped portion 63 a on the upper end side of the heat shield plate 63. Side is covered. The upper end of the umbrella-shaped portion 63a is open, and the bottom of the inner preform 50 is exposed to the outside at the open portion.

  A heater 64 is provided outside the heat shield plate 63. By energizing the heating wire 64a of the heater 64 while rotating the inner preform 50 together with the turntable 61 about the rotation shaft 61a, the heat of the heater 64 causes the inner preform 50 to be exposed from the open portion of the umbrella-shaped portion 63a. A predetermined area at the bottom can be heated. By heating the bottom of the inner preform 50 for a predetermined time, the bottom can be crystallized, and the whitening portion forming portion 53 can be formed.

  In addition, the whitening part formation part 53 can also be provided in the bottom part of the inner preform 50 using the whitening apparatus of another structure.

  By blow-molding the preform assembly 30 having the above configuration, the laminate peeling container 1 shown in FIG. 1 can be manufactured. In the present embodiment, biaxial stretching blow molding is employed as blow molding.

  More specifically, in the biaxial stretch blow molding of the preform assembly 30, the outer opening 41 and the inner opening 51 are formed by a blow molding die (not shown) constituting a blow molding device. The preform assembly 30 is set so that it protrudes from the cavity, the neck ring 41b is supported on the upper surface of the mold, and the outer extension portion 42 and the inner extension portion 52 are located inside the cavity. A pressurized medium such as pressurized air or pressurized liquid is supplied to the inside of the preform assembly 30 through the inner opening portion 51 while the portion 42 and the inner extension portion 52 are extended in the axial direction by the extension rod. Then, the inner extending portion 52 is blow-molded into a shape along the inner surface of the cavity. As described above, the preform assembly 30 in which the inner preform 50 formed by injection molding is incorporated inside the outer preform 40 formed by injection molding is biaxially stretch blow-molded. The peeling container 1 can be easily manufactured.

  Here, in the blow molding, the outer stretch portion 42 of the outer preform 40 and the inner stretch portion 52 of the inner preform 50 are stretched in the vertical direction (direction of the axis O) and the radial direction, respectively. The portion of the portion 42 where the gate portion forming portion 43 is provided and the portion of the inward extending portion 52 where the whitening portion forming portion 53 is provided have poor extensibility, and do not extend like other portions. Adhesion to each other after molding is reduced. Accordingly, in the laminated peeling container 1 after the molding, the adhesion of the portion of the storage portion 22 facing the gate portion 13 to the trunk bottom portion 12c can be reduced, and the peelability can be increased.

  As described above, by performing blow molding of the preform assembly 30 in which the whitening portion forming portion 53 is provided in the inner extension portion 52 of the inner preform 50, the whitening portion 23 is formed in a portion of the storage portion 22 facing the gate portion 13. It is possible to easily and inexpensively manufacture the laminated peeling container 1 in which the portion of the housing portion 22 facing the gate portion 13 has a reduced peeling resistance with respect to the inner surface of the body portion 12.

  The present invention is not limited to the above embodiment, and it goes without saying that various changes can be made without departing from the spirit of the present invention.

  For example, in the above-described embodiment, the outer container body 10 has a shape in which the body bottom portion 12c has a dome shape. However, the shape is not limited thereto, and the shape can be variously changed.

  The material of the outer container body 10 is not limited to polyethylene terephthalate resin, but may be, for example, polyester resin, polyolefin resin, nylon resin, polycarbonate resin (PC resin), cycloolefin copolymer resin (COC resin), or cycloolefin polymer resin (COP). Other synthetic resin materials such as resin) can also be employed.

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

  Further, the inner container 20 may be configured such that a gas barrier film such as a silica vapor-deposited film or a DLC film layer is 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 laminated peeling container 1 is enhanced, and when a gas-containing beverage such as carbonated water is contained as a content liquid, gas escape from the gas-containing beverage is prevented. Can be suppressed.

  Further, in the above-described embodiment, the case where the discharge device and the pressurizing device are mounted and used as a server is described as the laminated peeling container 1, but the present invention is not limited to this. The cap may be attached to the outer opening 11 and the body 12 may be squeezed to be used for a squeeze-type discharge container that discharges the content liquid. The present invention can also be applied to a laminate peeling container used for various applications, such as a rigid, pump-type discharging device used for a container with a pump attached to the outer opening 11.

REFERENCE SIGNS LIST 1 laminated peeling container 10 outer container body 11 outer opening 11a projection 11b neck ring 12 trunk 12a trunk shoulder 12b trunk main body 12c trunk bottom 13 gate 13a taper 13b outside air introduction passage 14 concave rib 15 Recess 20 Inner container 21 Inner mouth 21a Folded part 22 Housing 23 Whitening part 30 Preform assembly 40 Outer preform 41 Outer mouth 41a Projection 41b Neck ring 42 Outer extension 43 Gate part formation part 43a Closed part 50 Inner preform 51 Inner opening 51a Folded portion 52 Inner extending portion 53 Whitening portion 60 Whitening device 61 Rotating platform 61a Rotating shaft 62 Holding portion 63 Heat shield plate 63a Umbrella-shaped portion 64 Heater 64a Electric heating wire S Housing space

Claims (5)

A synthetic resin laminate peeling container formed by blow molding a preform assembly incorporating the inner preform inside the outer preform,
An outer container body having a cylindrical outer opening and a body connected to the outer opening,
An inner container body comprising: a cylindrical inner opening arranged inside the outer opening; and a volume-reducible deformable storage portion laminated releasably on the inner surface of the body.
A tubular gate portion provided on the inside with an outside air introduction passage communicating between the trunk portion and the housing portion, and a tubular gate portion provided integrally with the trunk portion;
A lamination release container, wherein a whitening portion is provided in a portion of the storage portion facing the gate portion.   The lamination release container according to claim 1, wherein the outer container body and the inner container body are each made of polyethylene terephthalate resin. Density of the whitening portion is 1.35 g / cm ³ or more, delamination container according to claim 2. The gate portion is cylindrical;
The lamination peeling container according to any one of claims 1 to 3, wherein the whitening portion has an outer circular shape having a larger diameter than the gate portion. The trunk, a trunk shoulder portion integrally connected to the outer opening portion, a trunk body portion integrally connected to the trunk shoulder portion, and a trunk bottom portion integrally connected to the trunk body portion. Prepared,
The gate portion is provided at a bottom portion of the trunk portion,
The lamination peeling container according to any one of claims 1 to 4, wherein the whitening portion is provided in a range facing the bottom portion of the trunk portion of the housing portion.

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