Delaminated container

Abstract

To provide a delamination container at a low cost, capable of reducing a residual quantity of content liquid by controlling volume loss deformation of a storage part.SOLUTION: A synthetic resin-made delamination container 1 is formed by blow-molding a preform assembly 40 obtained by incorporating an inner preform 60 into the inside of an external preform 50. The delamination container 1 comprises: an external layer body 10 having a cylindrical outer port 11 and a bottomed cylindrical trunk 12 connected to the outer port 11; an internal layer body 20 having a cylindrical inner port 21 arranged inside the outer port 11 and a storage part 22 free in volume-reducing deformation and peelably laminated on the inner surface of the trunk 12; and an outside air introduction port 13 for introducing outside air to between the external layer body 10 and the internal layer body 20. Three thick ribs 30 extending along an axis line O of the trunk 12 and making a thickness of the storage part 22 thicker than that of the other parts are integrally provided in the storage part 22.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a delaminated container made of synthetic resin, which is formed by blow molding a preform assembly in which an inner preform is incorporated inside an outer preform. [Background technology]

[0002] A delamination container (delamination container) made of synthetic resin is known as a container for storing liquid contents such as food seasonings such as soy sauce, beverages, cosmetics, shampoo, conditioner, and liquid soap. The delamination container has a double structure formed by blow molding a preform assembly in which an inner preform is incorporated inside an outer preform, and has an outer layer body with a cylindrical outer opening and a cylindrical body with a bottom connected to the outer opening, and an inner layer body with a cylindrical inner opening placed inside the outer opening and a storage section that is peelably laminated on the inner surface of the body and can be reduced in volume (see, for example, Patent Document 1).

[0003] Such a delaminating container can be used, for example, as a squeeze-type pouring container combined with a pouring cap equipped with a check valve, or as a pump-equipped container combined with a pump, and the contents can be poured out by squeezing (compressing) the body of the outer layer or operating the pump. After the contents are poured out, outside air can be introduced between the outer layer and the inner layer through an outside air inlet provided in the outer layer, thereby reducing the volume of only the container portion of the inner layer while restoring or maintaining the outer layer's original shape. Therefore, with this delaminating container, the contents contained in the container portion of the inner layer can be poured out without being replaced with outside air, reducing contact of the contents contained inside the inner layer with outside air and preventing deterioration or alteration of the contents. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2017-196822 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the conventional delaminating containers described above, a preform assembly in which an inner preform is incorporated inside an outer preform is blow-molded, so the entire container section of the inner layer is configured to be peelable from the inner surface of the body. As a result, when the liquid contents are poured out, the container section may peel off irregularly from the body of the outer layer, causing volume reduction and deformation. This may cause the inner surfaces of the container section to adhere to each other in the vertical middle part, narrowing or blocking the pouring path for the liquid contents, making it impossible to pour out the liquid contents to the end.

[0006] To address this problem, it is conceivable to provide an adhesive strip extending along the axial direction of the body between the outer layer and the inner layer, as in the case of delaminating containers formed by extrusion blow molding, and to control the shrinkage deformation of the containing section of the inner layer by partially adhering the inner layer to the outer layer with this adhesive strip. However, in order to provide an adhesive layer between the outer layer and the inner layer in a delaminating container formed by blow molding a preform assembly in which an inner preform is incorporated inside an outer preform, it is necessary to incorporate a strip-shaped member that constitutes the adhesive layer between the outer preform and the inner preform, which increases the number of parts of the preform assembly and the number of assembly steps, resulting in the problem of higher manufacturing costs for the delaminating container.

[0007] The present invention was made in consideration of these problems, and its purpose is to provide a low-cost delaminating container that can control the volumetric deformation of the storage section and reduce the remaining amount of liquid content. [Means for solving the problem]

[0008] The delaminating container of the present invention is a delaminating container made of synthetic resin, formed by blow molding a preform assembly in which an inner preform formed by injection molding separately from an outer preform formed by injection molding is incorporated inside the outer preform formed by injection molding, and has an outer layer body having a cylindrical outer opening and a cylindrical body with a bottom connected to the outer opening, an inner layer body having a cylindrical inner opening arranged inside the outer opening and a storage section that is releasably laminated on the inner surface of the body and is capable of being reduced in volume and deformed, and an outside air inlet port for introducing outside air between the outer layer body and the inner layer body, and the storage section is integrally provided with three thick ribs that extend along the axis of the body and make the storage section thicker than other parts, The outer layer body and the inner layer body are each made of polyethylene terephthalate resin, and a decorative label is attached to the body portion, covering the outer surface of the body portion and extending in the vertical direction at a position offset in the circumferential direction from the thick rib, the decorative label having a window portion for checking the remaining amount, which allows the content liquid contained in the container portion to be visually confirmed. It is characterized by the presence of

[0009] In the delaminating container of the present invention having the above-mentioned configuration, it is preferable that three of the thick ribs are arranged at equal intervals in the circumferential direction around the axis of the body portion.

[0010] In the above-described configuration of the peelable laminated container of the present invention, it is preferable that the body portion has a shoulder portion connected to the lower end of the outer opening portion, a cylindrical body main body portion connected to the lower end of the shoulder portion, and a bottom portion closing the lower end of the body main body portion, and that each of the thick ribs extend at least from a position corresponding to the lower end of the body main body portion to a position corresponding to the upper end.

[0011] In the delaminating container of the present invention having the above-described structure, it is preferable that each of the thick ribs extends from a position corresponding to the bottom portion to a position corresponding to the shoulder portion. [Effects of the Invention]

[0014] According to the present invention, it is possible to provide a delaminating container at low cost that can reduce the remaining amount of liquid content by controlling the volumetric shrinkage deformation of the containing section. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a side view showing a partially cutaway delaminating container according to an embodiment of the present invention. [Figure 2] FIG. 2 is a plan view of the delaminating container shown in FIG. [Figure 3] 2 is a partially cutaway cross-sectional view of the outer opening and inner opening of the delaminating container shown in FIG. 1. FIG. [Figure 4] FIG. 2 is a cross-sectional view taken along the line AA in FIG. [Figure 5] FIG. 5 is an enlarged view of the part surrounded by the dashed line in FIG. 4. [Figure 6] FIG. 5 is a cross-sectional view corresponding to FIG. 4, showing a state in which the storage section has been peeled off from the body section. [Figure 7] 2 is a side view showing a partly cutaway preform assembly for forming the delaminating container shown in FIG. 1.

[0023] FIG. [Figure 8] FIG. 8 is a side view showing the inner preform shown in FIG. 7 with a part cut away. [Figure 9] FIG. 9 is a cross-sectional view taken along the line BB in FIG. 8. [Figure 10] FIG. 9 is a cross-sectional view taken along line CC in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0016] The present invention will now be described in more detail with reference to the accompanying drawings.

[0017] 1, a delaminating container 1 according to one embodiment of the present invention is made of synthetic resin and is also called a delamination container (delamination container), and has a double structure having an outer layer 10 and an inner layer 20. The following describes the delaminating container 1 as being used as a squeeze-type dispensing container for containing a liquid content such as a food seasoning, such as soy sauce.

[0018] In this specification, claims, and drawings, the vertical direction refers to the vertical direction when the delaminating container 1 is in an upright position as shown in Figure 1, and the radial direction refers to the direction along a straight line that passes through the axis O of the delaminating container 1 and is perpendicular to the axis O.

[0019] The outer layer 10 is the part that constitutes the outer shell of the delaminated container 1, and is bottle-shaped with an outer opening 11 and a cylindrical body 12 with a bottom that is integrally connected to the lower end of the outer opening 11.

[0020] 1 and 2, the outer opening 11 is cylindrical and has a male thread 11a integrally formed on its outer circumferential surface. A pouring cap (not shown) equipped with a pouring outlet can be attached to the outer opening 11 by threading it onto the male thread 11a.

[0021] The outer opening 11 may have an annular projection instead of the male thread 11a, and the dispensing cap may be attached by engaging the projection in an undercut shape when the cap is attached. In this case, the outer opening 11 is not limited to a cylindrical shape, and may be any cylindrical shape, such as a square or elliptical cylindrical shape.

[0022] The outer opening 11 is provided with a pair of outside air inlets 13. Each of the pair of outside air inlets 13 is an elongated through-hole that penetrates the outer opening 11 in the radial direction and extends in the circumferential direction, and is disposed symmetrically on both sides of the axis O of the outer opening 11, as shown in Figures 2 and 3. Each of the pair of outside air inlets 13 communicates between the outer layer body 10 and the inner layer body 20, and outside air can be introduced between the outer layer body 10 and the inner layer body 20 through these outside air inlets 13.

[0023] 1, a sealing protrusion 11b is provided on outer opening 11 below outside air inlet 13. Seal protrusion 11b extends in an annular shape around the entire circumference of outer opening 11 and protrudes radially outward from the outer peripheral surface of outer opening 11, and when a dispensing cap is attached to outer opening 11, it comes into close contact with the peripheral wall of the dispensing cap to seal the gap between the lower end of the peripheral wall and outer opening 11. Note that a configuration without sealing protrusion 4b is also possible.

[0024] Furthermore, a neck ring 11c is integrally provided below the sealing protrusion 11b of the outer opening 11. The neck ring 11c extends in an annular shape around the entire circumference of the outer opening 11 and protrudes radially outward from the outer peripheral surface of the outer opening 11. The shape of the neck ring 11c can be changed as appropriate. Alternatively, the neck ring 11c may not be provided.

[0025] The body 12 has a shoulder portion 12a, a body main body portion 12b, and a bottom portion 12c.

[0026] The shoulder 12a is integrally connected to the lower end of the outer opening 11, gradually widens in diameter downward, and protrudes radially outward relative to the outer opening 11. The body main body 12b is formed in a tubular shape with a substantially circular cross section, and its upper end is integrally connected to the lower end of the shoulder 12a. The bottom 12c is integrally connected to the lower end of the body main body 12b and closes the lower end of the body main body 12b. The bottom 12c has a concave shape on the inside of the annular outer periphery, and by placing the bottom 12c on the ground, the delaminating container 1 can be placed in an upright position.

[0027] The body main body 12b is flexible and can be elastically deformed and depressed by being squeezed, and can then restore itself to its original shape from the depressed state due to this elastic force. By configuring the body main body 12b to be elastically deformable by squeezing, when the delaminating container 1 is used as a squeeze-type dispensing container, the content liquid can be easily poured out, and since the body main body 12b easily restores to its original shape after the content liquid is poured out, outside air can be reliably introduced between the outer layer 10 and the inner layer 20 through the outside air inlet 13, allowing the delaminating container 1 to function reliably.

[0028] The shoulder portion 12a is provided with a plurality of (18) vertically extending vertical recessed ribs 14 arranged at equal intervals around the entire circumference. For convenience, only one vertical recessed rib 14 is labeled with a reference number in Figures 1 and 2. By providing multiple vertical recessed ribs 14 on the shoulder portion 12a, it becomes easier to peel the inner layer body 20 from the outer layer body 10 at the shoulder portion 12a. Note that the vertical recessed ribs 14 may not be provided.

[0029] The body portion 12 can also be configured with an annular recessed rib 15 in the form of a recessed groove extending in the circumferential direction. In this embodiment, one annular recessed rib 15 is provided between the shoulder portion 12a and the body main body portion 12b, and three annular recessed ribs 15 are provided on the lower side of the body main body portion 12b. By providing the annular recessed rib 15 on the body portion 12, the rigidity of the body portion 12 can be increased. Note that the annular recessed rib 15 may not be provided.

[0030] The inner layer body 20 has an inner opening portion 21 and a storage portion 22 .

[0031] As shown in FIG. 3 , the inner opening 21 is cylindrical and has a smaller diameter than the outer opening 11, and is disposed coaxially inside the outer opening 11. A gap 23 having a predetermined distance is provided between the inner peripheral surface of the outer opening 11 and the outer peripheral surface of the inner opening 21. An expanded diameter portion 24 is integrally formed at the upper end of the inner opening 21, and the outer peripheral surface of the expanded diameter portion 24 abuts against the inner peripheral surface of the outer opening 11 over the entire circumference, thereby blocking the gap 23 between the outer opening 11 and the inner opening 21 from the outside at the upper end portions of the outer opening 11 and the inner opening 21. A flange portion 25 extending radially outward is integrally formed at the upper end of the expanded diameter portion 24, and the flange portion 25 abuts against the upper end of the outer opening 11, thereby positioning the inner opening 21 in the axial direction relative to the outer opening 11.

[0032] In addition, the inner opening portion 21 is not limited to a cylindrical shape, and may be formed in any tubular shape. For example, if the outer opening portion 11 is formed in a square or elliptical cylindrical shape, it can also be formed in a square or elliptical cylindrical shape.

[0033] The storage section 22 is formed in a bag shape that is thinner than the body section 12, is integrally connected to the lower end of the inner opening 21, and is peelably laminated on the inner surface of the body section 12. The interior of the storage section 22 forms a storage space S for the liquid content, and the liquid content can be filled into the storage section 22 through the inner opening 21, and the liquid content stored in the storage section 22 can be poured out through the inner opening 21. As the liquid content is poured out, the storage section 22 peels off from the inner surface of the body section 12 and undergoes volume reduction deformation (deforms to reduce the internal volume). As the volume of the storage section 22 decreases, outside air is introduced between the outer layer 10 and the inner layer 20 through the outside air inlet 13, and thus only the storage section 22 can easily peel off from the inner surface of the body section 12 and undergo volume reduction deformation, while the body main body section 12b maintains or restores its original shape.

[0034] As shown in FIG. 3 , vertical ribs 26 are integrally formed on the outer surface of the inner layer body 20 to ensure an airway for outside air from the outside air inlet 13 between the body 12 and the storage section 22. Although not shown in detail, the delaminated container 1 of this embodiment has eight vertical ribs 26 arranged at equal intervals circumferentially around the axis O on the outer surface of the inner layer body 20. Each vertical rib 26 protrudes radially outward from the outer surface of the inner layer body 20, with its upper end positioned below the outside air inlet 13 and its lower end reaching the shoulder 12a. The provision of these vertical ribs 26 forms an airway for outside air between the outer layer body 10 and the inner layer body 20, extending from the outside air inlet 13 to the shoulder 12a. This ensures that the outside air introduced through the outside air inlet 13 can be reliably introduced to the shoulder 12a through this airway.

[0035] The vertical ribs 26 may be provided on the inner peripheral surface of the outer opening 11, and the number of vertical ribs 26 can be set arbitrarily. Note that the vertical ribs 26 may not be provided on either the outer opening 11 or the inner opening 21.

[0036] In this embodiment, both the outer layer body 10 and the inner layer body 20 are made of polyethylene terephthalate resin (PET). By making the outer layer body 10 and the inner layer body 20 from polyethylene terephthalate resin, the delaminating container 1 can be made into a lightweight and highly transparent container.

[0037] In order to control the volumetric deformation of the storage section 22 and reduce the amount of liquid remaining in the storage space S, the storage section 22 of the inner layer body 20 is integrally provided with three thick ribs 30.

[0038] 1 and 4, the three thick ribs 30 extend vertically along the axis O of the body 12 and are arranged at equal intervals in the circumferential direction around the axis O of the body 12. In this embodiment, the three thick ribs 30 extend straight from a position corresponding to the bottom 12c of the storage section 22, through the body main body 12b, to a position corresponding to approximately the center of the shoulder 12a in the vertical direction.

[0039] As shown in FIGS. 4 and 5 , the three thick ribs 30 each protrude radially inward from the inner circumferential surface of the housing portion 22. The thickness of the housing portion 22 at the portions where the thick ribs 30 are provided is greater than the thickness of the remaining portions of the housing portion 22 where the thick ribs 30 are not provided. This results in a higher rigidity of the portions of the housing portion 22 where the thick ribs 30 are provided than the remaining portions where the thick ribs 30 are not provided. Therefore, the housing portion 22 is less likely to deform radially inward due to volume reduction at the three circumferential locations where the thick ribs 30 are provided than the remaining portions of the housing portion 22 where the thick ribs 30 are not provided, i.e., is less likely to peel off from the inner surface of the trunk main body portion 12b. The cross-sectional shape of the thick ribs 30 gradually increases in height from both sides in the circumferential direction, with the apex at the highest protrusion being smoothly curved.

[0040] The delaminating container 1 of this embodiment having the above-described configuration can be configured as a squeeze container by attaching a pouring cap to the outer opening 11. In this case, the pouring cap can be configured to include, for example, an outside air check valve that allows outside air to be introduced into the outside air inlet 13 and prevents outside air from flowing out from the outside air inlet 13, and a contents check valve that allows the contents to be poured out through the inner opening 21 and prevents outside air from flowing back into the storage section 22.

[0041] In the delaminating container 1 configured as a squeeze container, when the body main body 12b of the outer layer 10 is squeezed, the storage section 22 is deformed to reduce its volume, and the liquid contents are forced out through the dispensing cap and poured out. After the liquid contents are poured out, when the squeeze on the body main body 12b is released, the body main body 12b attempts to restore its original shape. At this time, outside air is introduced between the outer layer 10 and the inner layer 20 through the outside air inlet 13, causing the storage section 22 of the inner layer 20 to peel off from the inner surface of the body 12, so that only the body main body 12b restores its original shape while the storage section 22 remains deformed and reduced in volume. This allows the liquid contents contained in the storage section 22 to be poured out without being replaced with outside air, reducing contact of the liquid contents contained in the storage section 22 with outside air and suppressing its deterioration or alteration.

[0042] In the delaminating container 1 of this embodiment having the above configuration, the three thick ribs 30 are integrally formed in the storage section 22, and therefore, as shown in Fig. 6, when the storage section 22 undergoes volume reduction deformation as the content liquid is poured out, the portion of the storage section 22 where the three thick ribs 30 are provided does not peel off from the inner surface of the body main body 12b, and the portion where the thick ribs 30 are not provided peels off from the inner surface of the body main body 12b and approaches each other toward the axis O. In other words, the portion of the storage section 22 corresponding to the body main body 12b undergoes volume reduction deformation regularly in the direction of the axis O of the body 12 (vertical direction) so that the cross-sectional shape perpendicular to the axis O becomes approximately uniform. As a result, even if the content liquid is poured out of the storage space S and the amount of content liquid remaining inside the storage space S decreases, the flow path P for the content liquid, which is adjacent to the thick rib 30 and extends vertically from the bottom 12c through the body main body 12b toward the shoulder 12a, is easily maintained in the storage space S of the storage section 22. Therefore, the content liquid remaining inside the storage space S is poured out to the last by flowing through the flow path P to the inner opening 21, thereby reducing the amount of remaining content liquid.

[0043] In this way, in the delaminating container 1 of this embodiment, the storage section 22 is integrally provided with three thick ribs 30, so that with a simple configuration that does not require an adhesive band that partially bonds the outer layer 10 and the inner layer 20, the volume reduction deformation of the storage section 22 can be controlled and the storage section 22 can be regularly reduced in volume so that the cross-sectional shape in the direction of the axis O of the body 12 becomes approximately uniform. This prevents the inner surfaces of the storage section 22 from coming into close contact with each other in the vertical middle part, which would narrow or block the pouring path of the content liquid and prevent the content liquid from being poured out to the last drop, and reduces the amount of content liquid remaining inside the delaminating container 1.

[0044] Here, it is conceivable to provide two thick ribs 30 in the housing portion 22 symmetrically with respect to the axis O of the body portion 12.

[0045] However, with this configuration, as the liquid contents are poured out, the portion of the storage portion 22 between the two thick ribs 30 deforms and recesses toward the axis O, which may block the flow path P at the shoulder 12a and the bottom 12c. Furthermore, the circumferential length of each of the pair of arc-shaped portions between the two thick ribs 30 of the storage portion 22 is longer than the radial length between the two thick ribs 30 (the diameter of the barrel main body 12b). Therefore, as the liquid contents are poured out, the pair of arc-shaped portions of the storage portion 22 recess toward the axis O and come into contact with each other along the diameter of the barrel main body 12b, causing the portion of the storage portion 22 where the two thick ribs 30 are provided to deform and expand radially outward. This causes the outer surface of the portion of the storage portion 22 where the two thick ribs 30 are provided to rub strongly against the inner surface of the outer layer 10, resulting in a problem of increased friction noise due to this rubbing.

[0046] In contrast, in the delaminating container 1 of the present embodiment, the three thick ribs 30 are integrally formed on the storage portion 22. This causes the three arc-shaped portions between two adjacent thick ribs 30 of the storage portion 22 to deform toward the axis O when the liquid is poured out, thereby reducing the risk of the flow path P being blocked at the shoulder 12a and the bottom 12c. Furthermore, when the liquid is poured out, the three arc-shaped portions between two adjacent thick ribs 30 of the storage portion 22 deform so as to invert toward the axis O relative to the two adjacent thick ribs 30. This prevents the portion of the storage portion 22 where the three thick ribs 30 are provided from expanding radially outward. This prevents the outer surface of the portion of the storage portion 22 where the three thick ribs 30 are provided from rubbing strongly against the inner surface of the outer layer 10, thereby reducing the friction noise caused by this rubbing.

[0047] In the delaminating container 1 of this embodiment, three thick ribs 30 are arranged at equal intervals in the circumferential direction around the axis O of the body 12. This allows the arc-shaped portions of the storage section 22 between the three thick ribs 30 to be uniformly reduced in volume in the circumferential direction. This allows the storage section 22 to be more reliably reduced in volume and deformed more regularly, making it possible to further reliably reduce the amount of content liquid remaining inside the delaminating container 1.

[0048] Furthermore, in the delaminating container 1 of this embodiment, three thick ribs 30 are arranged at equal intervals in the circumferential direction around the axis O of the body 12, so that when squeezing the body 12b with fingers placed on both sides of the axis O of the body 12b to dispense the liquid contents, the fingers on one side can be positioned on the part where the thick rib 30 is provided and the fingers on the other side can be positioned on the part where the thick rib 30 is not provided. This makes it possible to easily finely adjust the degree of squeezing the body 12b even when the outer layer 10 is made of a hard material such as polyethylene terephthalate resin.

[0049] In the delaminating container 1 of this embodiment, the three thick ribs 30 preferably extend at least from a position corresponding to the lower end of the body main body 12b of the storage section 22 to a position corresponding to the upper end of the body main body 12b. With this configuration, most of the storage section 22 is regularly deformed to reduce in volume as described above, and the amount of content liquid remaining inside the delaminating container 1 can be further reliably reduced.

[0050] In particular, when the three thick ribs 30 are configured to extend from positions corresponding to the bottom 12c of the storage section 22 to positions corresponding to the shoulder 12a, as in the present embodiment, the volumetric deformation of the storage section 22 is controlled even in the portion corresponding to the bottom 12c, while a larger portion of the storage section 22, including the portion corresponding to the shoulder 12a, is regularly reduced in volume as described above, thereby further reliably reducing the amount of liquid remaining inside the delaminating container 1. Furthermore, as described above, the three thick ribs 30 each reach positions corresponding to the bottom 12c of the storage section 22, making it difficult for the portions of the storage section 22 where the thick ribs 30 are provided to peel off from the inner surface of the bottom 12c. This fixes the portion of the storage section 22 corresponding to the bottom 12c to the bottom 12c, preventing irregular volumetric deformation in the portion of the storage section 22 corresponding to the bottom 12c. Therefore, the entire storage section 22 can be regularly reduced in volume.

[0051] The delaminating container 1 having the above configuration can be formed by blow molding a synthetic resin preform assembly 40 shown in Fig. 7. This preform assembly 40 has a double structure in which an inner synthetic resin preform 60 for forming the inner layer body 20 is assembled inside an outer synthetic resin preform 50 for forming the outer layer body 10.

[0052] The outer preform 50 is formed into a predetermined shape corresponding to the outer layer body 10 by injection molding the same synthetic resin material as the outer layer body 10 using a mold. In this embodiment, the outer preform 50 is made of polyethylene terephthalate resin, just like the outer layer body 10.

[0053] The outer preform 50 has an outer opening 51 of the same shape as the outer opening 11 of the outer layer body 10. That is, the outer opening 51 is cylindrical, and a male thread 51a is integrally formed on its outer circumferential surface. A pair of outside air inlets 52, each penetrating the outer opening 51 in the radial direction, are symmetrically formed on both sides of the axis O of the outer opening 51. In addition, an approximately test-tube-shaped extension 53 with a hemispherical bottom is integrally formed at the lower end of the outer opening 51. The thickness of the extension 53 is greater than that of the outer opening 51. An annular sealing protrusion 54 and a neck ring 55 are integrally formed between the outer opening 51 and the extension 53.

[0054] The inner preform 60 is formed into a predetermined shape corresponding to the inner layer body 20 by injection molding the same synthetic resin material as the inner layer body 20 using a mold. In this embodiment, the inner preform 60 is made of polyethylene terephthalate resin, just like the inner layer body 20.

[0055] The inner preform 60 has an inner opening 61 of the same shape as the inner opening 21 of the inner layer body 20. That is, the inner opening 61 is cylindrical and has a smaller diameter than the outer opening 51, and is disposed coaxially inside the outer opening 51. An expanded diameter section 62 is integrally formed at the upper end of the inner opening 61, and the outer peripheral surface of the expanded diameter section 62 abuts the inner peripheral surface of the outer opening 51 over the entire circumference, thereby blocking the upper end of the gap between the outer opening 51 and the inner opening 61 from the outside. A flange section 63 extending radially outward is integrally formed at the upper end of the expanded diameter section 62, and the flange section 63 abuts against the upper end of the outer opening 51, thereby positioning the inner opening 61 axially relative to the outer opening 51. An approximately test-tube-shaped extension 64 with a hemispherical bottom is integrally formed at the lower end of the inner opening 61. The outer diameter of the extension portion 64 is smaller than the outer diameter of the inner opening portion 61. A gap is provided between the outer peripheral surface of the extension portion 64 and the inner peripheral surface of the extension portion 53 so that the outer peripheral surface of the extension portion 64 and the inner peripheral surface of the extension portion 53 are not damaged when the inner preform 60 is assembled inside the outer preform 50.

[0056] As shown in Fig. 8, eight longitudinal ribs 65 corresponding to the eight longitudinal ribs 26 are provided on the outer surface of the inner preform 60. As shown in Fig. 9, each of the longitudinal ribs 65 has a substantially trapezoidal cross section perpendicular to the axis O.

[0057] 8 and 10, three thickness-forming ribs 66 are provided on the inner surface of the extension portion 64 of the inner preform 60, arranged at equal intervals in the circumferential direction around the axis O. The thickness-forming ribs 66 protrude radially inward from the inner peripheral surface of the extension portion 64 so as to make the extension portion 64 thicker than other portions. These thickness-forming ribs 66 are parts that are stretched together with the extension portion 64 and molded into the thick ribs 30 when the preform assembly 40 is blow molded. Each of the three thickness-forming ribs 66 has a substantially arch-shaped cross section and extends straight along the axis of the extension portion 64 from a portion slightly below the upper end of the extension portion 64 to a portion near the lower end.

[0058] The preform assembly 40 having such a configuration is blow molded to manufacture the delaminating container 1 shown in Fig. 1. In this embodiment, biaxial stretch blow molding is used as the blow molding.

[0059] More specifically, the biaxial stretch blow molding of the preform assembly 40 involves setting the preform assembly 40 in a blow molding mold (not shown) that constitutes a blow molding device so that the outer opening 51 and the inner opening 61 protrude from the cavity of the mold, the neck ring 55 is supported on the upper surface of the mold, and the extensions 53, 64 are located inside the cavity, and in this state, while the extensions 53, 64 are stretched in the axial direction with a stretch rod, a pressurized medium such as pressurized air or pressurized liquid is supplied into the preform assembly 40 through the inner opening 61, and the extensions 53, 64 are blow molded into a shape that conforms to the inner surface of the cavity. In this way, the preform assembly 40, in which the inner preform 60 formed by injection molding is incorporated inside the outer preform 50 formed by injection molding, is biaxially stretch blow molded, thereby easily producing the delaminating container 1 having the above configuration.

[0060] The delaminating container 1 of this embodiment can be configured such that a decorative label is attached to the body 12 to cover the outer surface of the body 12. Although not shown in detail, various decorative labels, such as a shrink label, can be used.

[0061] In the peelable laminate container 1 of this embodiment, the outer layer 10 and the inner layer 20 are both transparent containers formed of polyethylene terephthalate resin, allowing the liquid content contained in the storage space S to be seen from the outside. However, if the outer surface of the body 12 is covered with a decorative label, it becomes difficult to see the liquid content contained in the storage space S from the outside. Therefore, the decorative label attached to the transparent peelable laminate container 1 of this embodiment is provided with a window portion extending vertically in a portion of the circumferential direction of the decorative label for checking the remaining amount of liquid, allowing the liquid content contained in the storage section 22 to be seen. In this case, the window portion may be formed by making a portion of the decorative label transparent, or by cutting out a portion of the decorative label. Furthermore, a decorative label configured in this manner is attached to the body 12 so that the window portion extends vertically at a position circumferentially offset from each of the three thick ribs 30. This prevents the flow path P, which is formed along the thick rib 30 and is always filled with the content liquid even when the remaining amount of the content liquid is low, from being viewed through the window portion, thereby preventing the erroneous recognition of the remaining amount, and makes it possible to visually check the exact remaining amount of the content liquid contained inside the container portion 22 through the window portion.

[0062] The present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the spirit and scope of the present invention.

[0063] For example, in the above embodiment, the thick rib 30 is provided so as to reach from the bottom 12c to the shoulder 12a, but this is not limited to this, and the vertical length of the thick rib 30 can be changed in various ways, for example, by extending the thick rib 30 until it reaches the lower end of the inner opening 21.

[0064] Furthermore, in the above embodiment, a pair of outside air inlets 13 are provided in the outer opening 11, but it is sufficient that at least one outside air inlet 13 is provided.

[0065] Furthermore, although outside air inlet 13 is a through-hole provided in outer opening 11 and penetrating outer opening 11, it is not limited to this and may be configured as, for example, a gap provided between the upper end of outer opening 11 and the upper end of inner opening 21 and opening to the outside. Alternatively, outside air inlet 13 may be configured to be provided in shoulder 12a, trunk body 12b, or bottom 12c.

[0066] Furthermore, the material of the outer layer 10 is not limited to polyethylene terephthalate resin, but other synthetic resin materials such as polyester resin, polyolefin resin, nylon resin, polycarbonate resin (PC resin), cycloolefin copolymer resin (COC resin), and cycloolefin polymer resin (COP resin) may also be used.

[0067] Furthermore, the material of the inner layer body 20 is not limited to polyethylene terephthalate resin, but may be other synthetic resin materials such as polyester resin, polyolefin resin, nylon resin, polycarbonate resin (PC resin), cycloolefin copolymer resin (COC resin), cycloolefin polymer resin (COP resin), and ethylene-vinyl alcohol copolymer resin (EVOH resin). When using ethylene-vinyl alcohol copolymer resin as the material of the inner layer body 20, an appropriate ethylene content can be selected in consideration of barrier properties and flexibility. Furthermore, to ensure barrier properties, the inner layer body 20 may have a multilayer structure, for example, with a barrier layer such as an MX nylon resin layer provided between a pair of polyethylene terephthalate resin layers.

[0068] Furthermore, the outer opening 11 may be configured without the sealing protrusion 11b or neck ring 11c, and the shape of the body 12, that is, the shoulder 12a, body main body 12b and bottom 12c, may also be modified in various ways.

[0069] Furthermore, in the above embodiment, the delaminated container 1 is shown as being used as a squeeze-type dispensing container in which a dispensing cap with a dispensing outlet is attached to the outer opening 11 and the content liquid is dispensed by squeezing the body 12, but the body 12 may have a predetermined rigidity that is not easily deformed by squeezing, and the container may be used as a pump-equipped container in which a pump-type dispensing tool is attached to the outer opening 11. In this case as well, the same effects as those described above can be obtained.

[0070] Furthermore, in the above embodiment, the wall thickness forming rib 66 is provided on the inner peripheral surface of the extension portion 64 of the inner preform 60 so as to protrude radially inward from the inner peripheral surface, but the wall thickness forming rib 66 may also be provided on the outer peripheral surface of the extension portion 64 of the inner preform 60 so as to protrude radially outward from the outer peripheral surface. [Explanation of symbols]

[0071] 1. Delaminated container 10 Outer body 11 External opening 11a male thread 11b Seal protrusion 11c neck ring 12 Torso 12a Shoulder 12b Body 12c bottom 13 Fresh air intake 14 Vertical concave rib 15 Circular concave rib 20 Inner layer 21 Inner entrance 22 Storage section 23 Gap 24 Expanded diameter part 25 flange 26 Vertical ribs 30 Thick Rib 40 Preform assembly 50 outer preform 51 External opening 51a male thread 52 Outside air intake 53 Stretching section 54 Seal protrusion 55 neck ring 60 Preforms 61 Inner mouth 62 Expanded diameter part 63 Flange 64 Stretching section 65 Vertical rib 66 Thick forming rib O axis S Storage space P distribution path

Claims

1. A delaminating container made of synthetic resin, which is formed by blow molding a preform assembly in which an inner preform formed by injection molding separately from an outer preform formed by injection molding is incorporated inside the outer preform, an outer layer body having a cylindrical outer opening and a cylindrical body portion with a bottom connected to the outer opening; an inner layer body including a cylindrical inner opening portion disposed inside the outer opening portion and a shrinkable and deformable storage portion peelably laminated on the inner surface of the body portion; an outside air inlet for introducing outside air between the outer layer body and the inner layer body, The housing portion is integrally provided with three thick ribs that extend along the axis of the body portion and make the housing portion thicker than other portions, the outer layer body and the inner layer body are each made of polyethylene terephthalate resin, A peelable laminated container characterized in that a decorative label is attached to the body portion, covering the outer surface of the body portion and having a window portion for checking the remaining amount of liquid contained in the storage portion, extending in the vertical direction at a position circumferentially offset from the thick rib, and allowing the remaining amount of liquid contained in the storage portion to be visually confirmed.

2. 2. The delaminating container according to claim 1, wherein three of the thick ribs are arranged at equal intervals in the circumferential direction around the axis of the body portion.

3. the body portion has a shoulder portion connected to a lower end of the outer opening portion, a cylindrical body main body portion connected to the lower end of the shoulder portion, and a bottom portion closing the lower end of the body main body portion, 3. The delaminating container according to claim 1, wherein each of the thick ribs extends from a position corresponding to at least the lower end of the body portion to a position corresponding to the upper end of the body portion.

4. 4. The delaminating container according to claim 3, wherein each of said thick ribs extends from a position corresponding to said bottom portion to a position corresponding to said shoulder portion.

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