CN112770978B

CN112770978B - Container with cover

Info

Publication number: CN112770978B
Application number: CN201980064280.3A
Authority: CN
Inventors: 内桥健太郎; 樽野真辅
Original assignee: Kyoraku Co Ltd
Current assignee: Kyoraku Co Ltd
Priority date: 2018-11-30
Filing date: 2019-11-26
Publication date: 2022-12-16
Anticipated expiration: 2039-11-26
Also published as: TW202030462A; CN112770978A; WO2020111024A1; TWI827742B

Abstract

Provided is a container with a cap, which can prevent the cap from exceeding the limit. According to the present invention, there is provided a cap container having a container body and a cap, the cap having an internal thread portion, the container body having an external thread portion at a mouth portion thereof to be screwed into the internal thread portion, the cap having a protrusion at a position closer to the container body than the internal thread portion, the container body having a riding portion to be engaged with the protrusion to restrict a loosening of the cap, and a stopper portion located closer to a fastening direction side of a thread than the riding portion to restrict an overrun of the cap.

Description

Container with cover

Technical Field

The invention relates to a container with a cover, a leakage inspection method of a double container, a laminated and peeled container and a manufacturing method thereof.

Background

(viewpoint 1)

A lidded container having a container body with a mouth portion formed with an externally threaded portion and a lid formed with an internally threaded portion is known. For example, patent document 1 discloses a structure in which a riding portion (protrusion) is provided for preventing a terminal portion of a thread at an external thread portion from being loosened when a cap is screwed by screwing. With this configuration, the end point of tightening can be grasped by the click feeling caused when the projection provided on the lower surface of the cover extends beyond the riding portion.

(viewpoint 2)

Patent document 2 detects whether or not a hole is present in the inner bag based on whether or not the pressure in the inner bag reaches a predetermined value after a predetermined time elapses by supplying air into the inner bag.

(viewpoint 3)

There is known a delamination container having an outer shell and an inner bag and reducing shrinkage of the inner bag with contents (for example, patent document 3). Such a laminated peel container is generally manufactured by blow molding using a cylindrical laminated parison.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2006-306460

Patent document 2: japanese patent No. 3303234

Patent document 3: japanese patent No. 3401519

Disclosure of Invention

Problems to be solved by the invention

(viewpoint 1)

In the structure of the above-mentioned patent document 1, when the protrusion of the cover exceeds the riding section, the cover can be further tightened in principle, and there is still a case where over tightening (overran, overrun) occurs.

The present invention has been made in view of such circumstances, and provides a container with a lid capable of preventing the lid from being overrun.

(viewpoint 2)

In the method of patent document 2, when the inner bag is unintentionally inflated by supplying air into the inner bag, whether or not there is a hole in the inner bag, it is determined that there is a hole in the inner bag. It is therefore desirable to use other means of leak detection methods.

The present invention has been made in view of the above circumstances, and provides a leak inspection method capable of detecting whether or not a pinhole is present in an inner bag of a dual container.

(viewpoint 3)

In the bottom portion of the laminate peel container shown in patent document 3, a pinch-off portion (seal portion) to which one end of the laminated parison is welded is provided, but the inner bag may be separated from the bottom portion at the pinch-off portion. If the inner bag is detached from the bottom portion in a state where the contents remain in the inner bag, the inner bag cannot be restricted from contracting, and the flow path is blocked or pinholes are generated. In the laminate peel container of patent document 3, the fusion-bonded layer at the pinch-off portion is fused by the plurality of engaging portions engaging with each other, but in order to realize such a configuration, the structure of the mold is complicated. And the production cost is high. In such a configuration, there is also a problem that the pinch-off portion cannot be provided with an outside air introduction portion for introducing outside air between the outer case and the inner bag.

The present invention has been made in view of the above circumstances, and provides a delamination container in which detachment of an inner bag from a bottom portion is restricted.

Means for solving the problems

(viewpoint 1)

According to the present invention, there is provided a lidded container comprising a container body and a lid, wherein the lid has an internal thread portion, the container body has an external thread portion at a mouth portion thereof to be screwed into the internal thread portion, the lid has a protrusion at a position closer to the container body than the internal thread portion, the container body has a riding portion which engages with the protrusion to restrict loosening of the lid, and a stopper portion which is located on a side of a fastening direction of a thread of the riding portion to restrict overrun of the lid.

According to the present invention, since the container body is provided with the stopper portion on the fastening direction side of the riding portion, the lid can be prevented from being overrun.

It is preferable that the height of the stopper is set to be larger than the height of the ride portion, and/or the protruding width of the stopper in the radial direction is set to be larger than the protruding width of the ride portion in the radial direction.

Preferably, the protrusions are provided at circumferentially opposite 2, and the ride portion and the stopper portion are provided at circumferentially opposite 2, respectively.

It is preferred that the height of the stop portion that limits overrun of one protrusion is a substantially maximum height that does not interfere with the other protrusion.

Preferably, the stopper portion has a tapered surface that prevents interference with the other protrusion on a fastening direction side of the thread in the circumferential direction.

Preferably the container body has an outer shell and an inner bag and the inner bag collapses as the contents decrease.

Preferably, an air introduction hole is formed in the housing, and the riding portion and the stopper portion are provided at substantially the same position as or at positions opposite to the air introduction hole in the circumferential direction.

(viewpoint 2)

According to the present invention, there is provided a method for inspecting leakage in a dual container which has an outer shell and an inner bag and in which the inner bag contracts as the content decreases, the method including a step of determining whether or not a pinhole is present in the inner bag based on data obtained when the interior of the inner bag is depressurized.

When the inner bag is depressurized, the flow rate of air sucked from the inner bag or the pressure of the depressurized air varies depending on whether or not there is a pinhole in the inner bag. Whether the inner bag has a pinhole can be determined based on the difference.

Hereinafter, various embodiments of the present invention will be described by way of examples. The embodiments shown below may be combined with each other.

Preferably, the determination of the method is performed based on an air flow rate sucked out from the inner bag at the time of the depressurization.

Preferably, the pressure reduction in the method is performed in a state where a rod-shaped portion is inserted into the inner bag from the mouth portion of the dual container.

Preferably, the method for peeling off the double container comprises a peeling step of peeling off the inner bag from the outer shell by reducing the pressure inside the inner bag in a state where the rod-shaped portion is inserted into the inner bag from the mouth portion of the double container.

In the above method, preferably, the length of the portion of the rod-shaped portion inserted into the inner bag is L, and L/H is 0.40 or more, where H is the overall height of the double container.

Preferably, in the above method, when the diameter of the inscribed circle of the inner peripheral surface of the mouth part is D1, the diameter of the circumscribed circle of the rod-shaped part is D2, and D2/D1 is 0.30 or more.

Preferably, the pressure reduction in the method is performed through a suction port provided in the rod-shaped portion.

Preferably, the suction port of the method is provided at a tip of the rod-shaped portion.

(viewpoint 3)

According to the present invention, there is provided a laminated and peelable container which includes an outer case and an inner bag and in which the inner bag shrinks as a content decreases, the laminated and peelable container including an accommodating portion for accommodating the content and a pinch-off portion formed at a bottom portion of the accommodating portion, an engagement portion for engaging the outer case and the inner bag is provided at an end portion in a longitudinal direction of the pinch-off portion, the inner bag includes a convex portion protruding outward in the longitudinal direction at the engagement portion, the outer case includes a concave portion for engaging with the convex portion at the engagement portion, and a protruding amount of the convex portion in the longitudinal direction is 0.15 times or more a length in the longitudinal direction from a center of the bottom portion to a tip of the convex portion.

According to the present invention, the engagement portion is provided at the end portion in the longitudinal direction of the pinch-off portion, and the convex portion of the inner bag is engaged with the concave portion of the outer shell at the engagement portion, whereby detachment of the inner bag can be restricted.

Hereinafter, various embodiments of the present invention will be described by way of examples. The embodiments shown below can be combined with each other.

Preferably, the front end of the projection projects to substantially the same position as the edge of the bottom surface of the inner bag in the radial direction or projects outward beyond the edge of the bottom surface of the inner bag.

Preferably, the pinch-off portion includes an outside air introduction hole for introducing outside air into a space between the outer case and the inner bag.

Further, according to the present invention, there is provided a method of manufacturing a laminated and peeled container having an outer shell and an inner bag and in which the inner bag is shrunk as a content decreases, comprising a blow molding step of using a cylindrical laminated parison, wherein the mold comprises a compression portion which compresses the laminated parison before closing the mold and flows the laminated parison in a container inner direction, in the vicinity of a nip portion which forms a pinch-off portion of the laminated and peeled container, the compression portion comprises 1 st compression regions which are formed in positions in the vicinity of both end portions in a longitudinal direction of the nip portion, and 2 nd compression regions which are formed in positions between the 1 st compression regions, and a width of the 1 st compression region when closing the mold is smaller than a width of the 2 nd compression region when closing the mold.

Preferably, the diameter of a die for extruding the laminated parison is 2/pi times or less of the inner diameter of the bottom-forming portion of the inner diameter of the mold.

Preferably, the 1 st compression region is closed to have a width equal to or less than the thickness of the laminated parison, and the 2 nd compression region is closed to have a width 2 times or less the thickness of the laminated parison.

Preferably, the 2 nd compressed region has a width of 5mm or less when the mold is closed.

Drawings

Fig. 1 is a front perspective view of a container main body 2 of a stacking and peeling container 1 according to an embodiment 1 of the present invention.

Fig. 2 is a front view of the container body 2 in fig. 1.

Fig. 3 is a sectional view showing a main structural part of the container body 2 in fig. 1 in a state where the lid 4 is attached.

Fig. 4A is an enlarged view of an X portion in fig. 3, and fig. 4B is an enlarged view of a Y portion in fig. 3.

Fig. 5 isbase:Sub>A sectional view taken along linebase:Sub>A-base:Sub>A of fig. 3.

Fig. 6A is a front view of the vessel body 2 in fig. 1 with a main portion enlarged, and fig. 6B is a front view of the vessel body 2 in fig. 1 with a main portion enlarged.

Fig. 7 is a perspective view of the duplex container 101 as a target of the leak inspection according to the 2 nd aspect of the present invention.

Fig. 8 is a block diagram of the leak inspection apparatus 102 according to embodiment 1 of viewpoint 2 of the present invention.

Fig. 9 is an exploded perspective view showing the structure of the head member 103 in fig. 8.

Fig. 10 is a sectional view showing a state where the head member 103 in fig. 9 is abutted against an end surface of the mouth 109 of the dual container 101.

Fig. 11 is a cross-sectional view showing a state in which the pressure inside the inner bag 114 is reduced from the state in fig. 10 and the inner bag 114 is contracted.

Fig. 12 is a diagram showing the relationship between the time and the flow rate measured when the pressure inside the inner bag 114 is reduced.

Fig. 13 is an exploded perspective view showing the structure of the head member 103 of the leak inspection apparatus 102 according to embodiment 2 of viewpoint 2 of the present invention.

Fig. 14 is a sectional view showing a state where the head member 103 of fig. 13 is abutted against an end surface of the mouth 109 of the dual container 101.

Fig. 15 is a cross-sectional view showing a state in which the pressure inside the inner bag 114 is reduced from the state in fig. 14 and the inner bag 114 is contracted.

Fig. 16 is a cross-sectional view corresponding to fig. 11 when the inner bag 114 is unevenly peeled.

Fig. 17 is a sectional view showing a state in which the bottom 114a of the inner bag 114 is lifted after the pressure inside the inner bag 114 is further reduced from the state of fig. 11.

Fig. 18A is a perspective view of a stacking and peeling container 201 according to an embodiment of viewpoint 3 of the present invention, and fig. 18B is a perspective view showing a bottom portion 232 of the stacking and peeling container 201 in fig. 18A.

Fig. 19 is a sectional view of the container body 203 of the stacking and peeling container 201 in fig. 18A.

Fig. 20 is a sectional view of the container main body 203 sectioned at a section perpendicular to the section of fig. 19.

Fig. 21 is a front view showing a pump 204 of the stacking and peeling container 201 in fig. 18A.

Fig. 22A is an enlarged view of the bottom portion 232 shown in the sectional view of fig. 19, and fig. 22B is an enlarged view of the bottom portion 232 shown in the sectional view of fig. 20.

Fig. 23A is an enlarged perspective view of the bottom of the inner bag as viewed from the outside, and fig. 23B is an enlarged perspective view of the bottom of the outer shell as viewed from the inside.

Fig. 24A is a schematic end view showing a case where the blow mold 202 used in the step of manufacturing the laminated and peeled container 201 in fig. 18 is cut out in a direction perpendicular to the parting plane, and fig. 24B is a schematic diagram showing the parting plane of the

parting molds

202X and 202Y.

Fig. 25A isbase:Sub>A sectional view taken along linebase:Sub>A-base:Sub>A in fig. 24A and 24B, and fig. 25B is an enlarged view of region R in fig. 25A.

Fig. 26A to 26C are explanatory views showing a state in which the pair of

split molds

202X and 202Y are closed gradually and the parisons P are stacked in a closed mold.

Fig. 27A shows a modification 1 of the

split molds

202X and 202Y shown in fig. 25B, and a modification 2 of the

split molds

202X and 202Y shown in fig. 27B.

Detailed Description

Hereinafter, embodiments of the present invention will be described. Various technical features shown in the embodiments shown below may be combined with each other. In addition, each feature may independently establish the present invention.

(embodiment according to 1 st aspect)

A laminated and peeled container 1 as a container with a lid according to an embodiment of claim 1 includes: a substantially bottomed cylindrical container body 2 shown in fig. 1 to 3, a valve member 3 shown in fig. 3, and a screw-type cap 4.

As shown in fig. 1, the container body 2 includes: a storage part 5 for storing the contents, an opening 6 for discharging the contents from the storage part 5, and a shoulder 7. In the present embodiment, the diameter of the mouth 6 is smaller than that of the housing 5, and the housing 5 and the mouth 6 are connected by the shoulder 7.

As shown in fig. 3, the container body 2 has a multi-layer structure such as an outer shell 12 and an inner bag 14 at the storage portion 5, the mouth portion 6, and the shoulder portion 7, and the inner bag 14 is separated from the outer shell 12 and contracted as the content decreases. The air inlet hole 8 is provided only in the housing 12 on the side surface of the housing 5. Further, a male screw portion 6a is provided on the outer peripheral surface of the mouth portion 6.

In addition, as shown in fig. 1 and 2, the container main body 2 of the present embodiment includes a riding portion 21 and a stopper portion 22 at a boundary portion between the mouth portion 6 and the shoulder portion 7. The stopper 22 is provided on the fastening direction side of the thread of the external thread portion 6a (clockwise direction in fig. 1 and 2) than the ride portion 21. The saddle 21 restricts the looseness of the cover 4 by engaging with a protrusion 44f of the cover 4 to be described later. The stopper 22 limits the movement of the projection 44f to the cover 4. A recess 23 is formed at a position between the ride portion 21 and the stopper portion 22, and the projection 44f is positioned in the recess 23 when the cap 4 is screwed on the mouth portion 6. In the present embodiment, as shown in fig. 2, the rider 21 and the stopper 22 are provided in pairs at circumferentially opposite positions.

As shown in fig. 3, the valve member 3 is inserted into the air introduction hole 8. The valve member 3 is configured to regulate the entrance and exit of air between the space G between the outer case 12 and the inner bag 14 and the outside. As the structure of the valve member 3, for example, a structure (see fig. 3) in which a gap between the edge of the air introduction hole 8 and the valve member 3 is opened or closed by moving the valve member 3 to open or close the air introduction hole 8 by the valve member 3, or a structure in which a valve capable of opening or closing a through hole is provided in the valve member 3 itself and the through hole is opened or closed by the operation of the valve to open or close the air introduction hole 8 can be used. Further, instead of providing the valve member 3, the air inlet/outlet may be adjusted by attaching a film to the air inlet hole 8, or simply by closing the air inlet hole 8 with a finger or the like when discharging the contents. The valve member 3 may have any of the above configurations, and may have: when the outer case 12 is compressed, the air introduction hole 8 is closed to make the inner bag 14 compressible, and when the compression force on the outer case 12 is released, the external air is introduced into the space G.

After the valve member 3 is attached, the housing portion 5 is covered with a shrink film. At this time, the valve member mounting recess 5a is formed in the housing portion 5 so that the valve member 3 does not interfere with the shrink film. Further, an air circulation groove 5b extending from the valve member mounting recess 5a in the direction of the shoulder 7 is provided so that the valve member mounting recess 5a is not sealed by the shrink film (see fig. 1).

In the present embodiment, the valve member mounting recess 5a and the air circulation groove 5b are provided at substantially the same positions in the circumferential direction or at positions opposed (facing) in the circumferential direction with respect to the pair of the riding portion 21 and the stopper portion 22. With such a positional relationship, after the inner bag 14 near the air inlet hole 8 is preliminarily peeled from the outer casing 12 in the vicinity of the riding section 21 and the stopper section 22 when the valve member 3 is attached, the inner bag 14 and the outer casing 12 are less likely to come into close contact, and the inner bag 14 is likely to be peeled off when the contents are discharged.

Further, by this positional relationship, when the container body 2 of the present embodiment is formed by blow molding, the valve member mounting recess 5a and the air circulation groove 5b around the air introduction hole 8 can be formed at positions displaced by 90 degrees from the parting line together with the ride portion 21 and the stopper portion 22. In this way, undercuts can be prevented from being generated in forming the valve member mounting recess 5a, the air flow through groove 5b, the riding portion 21, and the stopper portion 22.

As shown in fig. 3, the lid 4 includes a lid body 41 and a lid cover 43 connected to the lid body 41 by a hinge 42. The cap body 41 is composed of 3 main cap members 44, a check valve 45, and a discharge member 46.

The main lid member 44 is composed of an outer tube portion 44a, an inner tube portion 44b, and an annular portion 44c connecting the upper ends thereof. An inner peripheral surface of the outer tube portion 44a is formed with a female screw portion 44d to be screwed with the male screw portion 6a of the spout portion 6 of the container main body 2. As shown in fig. 3, 4A, and 4B, an enlarged diameter portion 44e having a larger diameter is formed at an end portion of the outer tube portion 44A located below the female screw portion 44d (on the container main body 2 side). Projections 44f (see fig. 4A, 4B, and 5) projecting radially inward are formed at the positions 2 opposed (facing) in the circumferential direction inside the enlarged diameter portion 44e. The projection 44f is configured to engage the riding portion 21 and the stopper portion 22 of the container body 2. The relationship between this projection 44f and the ride portion 21 and the stopper portion 22 will be described later. A valve seat 44g for supporting the check valve 45 is formed inside the inner tube portion 44 b.

The check valve 45 includes a valve body 45a and an elastic piece 45b. The check valve 45 is fixed in the inner tube 44b of the main lid member 44 by the discharge member 46 engaging with the annular portion 44c of the lid body 41. The check valve 45 is configured such that when the pressure in the housing portion 5 (in the inner bag 14) increases, a valve body 45a of the check valve 45 is pressed up from a valve seat 44g of the main lid member 44. In this manner, the storage portion 5 of the squeeze container body 2 can discharge the content in the storage portion 5 from the discharge port 46a of the discharge member 46. When the pressing is stopped, the check valve 45 is closed by the urging force of the elastic piece 45b of the check valve 45 supporting the valve body 45 a. With such a configuration, the delamination container 1 according to the present embodiment can prevent external air from flowing into the inner bag 14, and can suppress deterioration of the contents.

Hereinafter, the structure of attaching the cap 4 to the mouth 6 will be described in further detail with reference to fig. 5 to 6B.

When the cap 4 is attached to the mouth portion 6 of the container body 2, the male screw portion 6a of the mouth portion 6 is screwed into the female screw portion 44d of the cap 4 as described above. As shown in fig. 5, when the cap 4 is rotated in the tightening direction to the screw end, the pair of opposing (facing) projections 44f of the cap 4 ride on the corresponding riding portions 21 of the mouth portion 6 and are fitted into the recess 23. Here, the saddle 21 has an inclined portion 21a inclined toward the fastening direction side gradually toward the radial outer side opposite to the fastening direction, so that the projection 44f can be easily passed over. When the projection 44f is fitted in the recess 23, the saddle 21 functions to prevent loosening (prevent turning), and the cover 4 can be prevented from loosening.

The mouth portion 6 of the present embodiment has a stopper portion 22 on the side of the saddle portion 21 in the fastening direction of the screw. With this configuration, the lid 4 can be prevented from exceeding a predetermined fastening position (over-fastening) at which the protrusion 44f is fitted into the recess 23. With such a configuration, in the stacking and peeling container 1 of the present embodiment, when the lid 4 is attached, the end point of fastening can be easily grasped by the click feeling due to the riding of the projection 44f, and the lid 4 can be positioned at an appropriate fastening position by engaging the projection 44f with the stopper 22.

However, in the laminate peel container 1 of the present embodiment, since the container body 2 is separated between the outer case 12 and the inner bag 14 and each layer is thin, the strength of the stopper portion 22 and the like has a limitation. Further, in the case of the laminate peeling container 1, the inner bag 14 to be peeled needs to be formed thinner, so that it is difficult to locally increase the thickness by parison control. Therefore, when the screwing operation of the lid 4 is performed, the stopper 22 may be crushed due to insufficient strength of the stopper 22, causing a situation in which the limit of the stopper 22 is exceeded to occur.

As shown in fig. 6A, the radial projecting width T2 of the stopper 22 of the container main body 2 of the present embodiment is set to be larger than the radial projecting width T1 of the saddle 21. The circumferential width W2 of the stopper 22 is set larger than the circumferential width W1 of the saddle 21. As shown in fig. 6B, the height H2 of the stopper 22 is set larger than the height H1 of the ride 21. With this configuration, the strength of the stopper 22 can be increased without increasing the thickness of the container body 2.

The ride 21 and stop 22 are provided to span both the mouth 6 and shoulder 7 at the boundary of the mouth 6 and shoulder 7. As long as the container body 2 of the present embodiment has such a configuration, the lightness of the saddle 21 and the stopper 22 can be increased as compared with the case where the saddle 21 and the stopper 22 are projected only from the mouth 6 or only from the shoulder 7.

When the height H2 of the stopper 22 is increased, the other projections 44f may interfere with each other before the end of fastening of the cover 4 is almost half a circumference. However, in the present embodiment, the height H2 of the stopper portion 22 is set to be substantially the maximum height that does not interfere with the other protrusions 44f, and the upper surface of the stopper portion 22 is made into a tapered surface 22f whose height gradually decreases in the fastening direction (see fig. 6B). In this way, it is possible to prevent the mounting operation of the cover 4 from being hindered while maintaining the strength of the stopper 22. In the present embodiment, the stopper 22 is configured as a tapered surface 22g having a height decreasing toward the fastening direction. Since the height H1 of the riding section 21 is smaller than the height H2 of the stopper section 22, the projection 44f of the cover 4 easily rides on the riding section 21.

The invention according to claim 1 can be implemented as follows.

In the above embodiment, the height H1 and the radial projecting width T1 of the riding section 21 may be increased based on the height H2 and the radial projecting width T2 of the stopper section 22. However, only one of the height of the stopper 22 and the radial projection width T2 may be larger than the height of the seat 21. In such a configuration, the strength of the stopper 22 can be improved. Further, the heights and the projecting widths of the saddle 21 and the stopper 22 may not be changed, and the strength of the stopper 22 may be improved by simply setting the circumferential width W2 of the stopper 22 to be larger than the circumferential width W1 of the saddle 21. By making at least 1 of the height, the projecting width, and the circumferential width of the stopper 22 larger than the saddle 21, the strength of the stopper 22 can be increased.

In the above embodiment, the protrusion 44f of the cover 4 protrudes radially inward from the enlarged diameter portion 44e. However, the projection 44f may be configured to extend downward from the end of the outer cylindrical portion 44a of the cover 4.

In the above embodiment, the riding portions 21 and the stoppers 22 of the container body 2 are provided in pairs at positions opposed to each other in the circumferential direction, but only 1 riding portion 21 and one stopper 22 may be provided. Further, 3 or more of the saddle portion 21 and the stopper portion 22 may be provided.

In the above-described embodiment, although the lidded container is described as the laminated and peeled container 1, the lidded container may not be the laminated and peeled container 1. Even in a container that is not peeled off normally, the stopper 22 may be provided on the side of the container body 2 closer to the fastening direction of the screw than the riding portion 21, so that the limit of the lid 4 is prevented from being exceeded.

(embodiment in view of 2 nd aspect)

1. Embodiment 1 of the invention in view 2

Next, a method of inspecting a double container for leaks according to embodiment 1 of aspect 2 of the present invention will be described.

< Dual Container 101 >

First, the dual container 101 to be subjected to leak inspection will be described with reference to fig. 7, 10, and 11. The duplex container 101 has an outer shell 112 and an inner bag 114, and the inner bag 114 contracts as the contents decrease, i.e., the duplex container 101 is a peel-apart container. The inner bag 114 is separated from the outer shell 112 and contracted by separating the inner bag 114 from the outer shell 112 as the content decreases. By using this container, external air is less likely to enter the inner bag 114, and thus deterioration of the contents can be suppressed.

The outer shell 112 is constructed of, for example, low density polyethylene, linear low density polyethylene, high density polyethylene, polypropylene, ethylene-propylene copolymers, blends thereof, and the like. The housing 112 may be constructed of multiple layers. The inner bag 114 is preferably constructed from a plurality of layers. For example, an ethylene vinyl alcohol copolymer (EVOH) layer made of an EVOH resin may be used as the layer in contact with the outer shell 112, and a polyolefin such as low density polyethylene, linear low density polyethylene, high density polyethylene, polypropylene, an ethylene-propylene copolymer, or a mixture thereof may be used as the inner layer in contact with the content. An adhesive layer is preferably used between the EVOH layer and the back surface layer.

The dual container 101 has a bottomed cylindrical shape, and includes a storage portion 107 for storing the contents and a mouth portion 109 for discharging the contents from the storage portion 107. The housing portion 107 includes a body portion 107a and a bottom portion 107b. An engaging portion (male screw portion) 109d is provided in the mouth portion 109, and a cap or a pump can be attached.

When the double container 101 is formed by direct blow molding, the double container 101 has a snap-off portion 107d formed by crushing a parison by a pair of split molds. The snap-off portion 107d is provided at the bottom portion 107b of the duplex container 101, and the bottom of the duplex container 101 is closed by welding the two opposing surfaces of the parison at the snap-off portion 107d. Although the snap-off portion 107d closes the bottom portions of the outer case 112 and the inner bag 114, respectively, the snap-off portion 107d is particularly weak at the outer case 112, so that when the outer case 112 is struck, the snap-off portion 107d is opened at the outer case 112 to form the outside air introducing portion 115. The outside air can be introduced between the outer case 112 and the inner bag 114 through the outside air introduction unit 115. When the outside air introducing portion 115 is formed in the snap-off portion 107d, the bottom of the inner bag 114 is almost fixed to the bottom 107b of the dual container 101. Therefore, the bottom 114a of the inner bag 114 is easily separated from the bottom 107b of the dual container 101 and floats. The outside air introducing unit 115 may be formed by punching a hole in the casing 112. The outside air introducing portion 115 may be provided in the storage portion 107 or may be provided in the mouth portion 109.

< leak inspection apparatus 102 >

A leak inspection apparatus 102 used for implementing the leak inspection method of the dual container 101 according to the present embodiment will be described with reference to fig. 8 to 10. The leak inspection apparatus 102 includes a head member 103, an electromagnetic valve 104, a pressure reducing system 105, a pressure increasing system 106, and a pipe 108. The pipe 108 includes a pipe 108a for connecting the head member 103 and the solenoid valve 104, a pipe 108b for connecting the depressurization system 105 and the solenoid valve 104, and a pipe 108c for connecting the pressurization system 106 and the solenoid valve 104. By controlling the solenoid valve 104, the connection between the head member 103 and either one of the depressurization system 105 and the pressurization system 106 can be switched. Air may be drawn through the head 103 by the pressure reducing system 105 and air may be drawn through the head 103 by the pressurizing system 106.

The pressure reducing system 105 includes a flow meter 151, a pressure gauge 152, a regulator 153, and a vacuum pump 154 in this order from the electromagnetic valve 104 side. The vacuum pump 154 discharges the air in the pipe 108b to reduce the pressure in the pipe 108 b. The regulator 153 controls the flow rate of air flowing through the pipe 108b or the pressure of air in the pipe 108 b. The pressure gauge 152 measures and records the air pressure within the tubing 108 b. The flow meter 151 measures and records the flow rate of air flowing in the pipe 108 b. The order of the components included in the depressurization system 105 may be changed or omitted as appropriate.

The pressurization system 106 includes a speed controller 161, a regulator 162, and a compressor 163 in this order from the solenoid valve 104 side. The compressor 163 supplies compressed air into the pipe 108c. The regulator 162 controls the air pressure in the pipe 108c. The speed controller 161 controls the flow rate of air flowing in the pipe 108c. Note that the pressurization system 106 may be omitted when not necessary, and in this case, the solenoid valve 104 may be omitted.

The head member 103 includes a head member base 131 and a seal 132. The head member base 131 and the seal 132 are provided with through

holes

131a and 132a, respectively, which communicate with the interior of the pipe 108 a. The seal 132 is disposed in the receiving recess 131b of the head member base 131. The sealing member 132 is made of a material such as an elastomer that can improve air tightness. According to such a configuration, as shown in fig. 10, when the head base 131 is pressed against the end surface of the port 109, the head base 131 and the end surface of the port 109 are brought into close contact with each other via the seal 132, and the inner portion of the inner bag 114 is communicated with the outside only through the through

holes

131a and 132a, and the inner bag of the inner bag 114 can be depressurized or pressurized by the depressurization system 105 or the pressurization system 106.

< method of leak inspection >

A leak inspection method of the double container 101 of the present embodiment will be described. The method includes a step of determining whether or not the inner bag 114 has a pinhole based on data obtained when the pressure inside the inner bag 114 is reduced.

This step can be performed by operating the vacuum pump 154 in a state where the head member 103 is connected to the decompression system 105 and the head member 103 is pressed against the end surface of the mouth 109. As a result, as shown in fig. 11, air inside the inner bag 114 is sucked out, the pressure inside the inner bag 114 is reduced, and the inner bag 114 is contracted.

As shown in fig. 12, after the pressure reduction is started, the air flow rate measured by the flow meter 151 rapidly increases, and the flow rate gradually decreases as the inner bag 114 contracts. When there are no pinholes in the inner bag 114, the air flow rate becomes very small (almost 0) when the inner bag 114 collapses. On the other hand, if the inner bag 114 has a pinhole, air flows into the inner bag 114 through the pinhole even if the inner bag 114 collapses, so the flow rate of air sucked out of the inner bag 114 is larger than in the case where the inner bag 114 has no pinhole. Therefore, after the predetermined time T has elapsed, it is possible to determine whether or not the pinhole is present in the inner bag 114 based on the air flow rate sucked out from the inner bag 114 (more specifically, by checking whether or not the flow rate exceeds the threshold Th).

If the inner bag 114 has a pinhole, the degree of sealing inside the inner bag 114 becomes low, and the degree of pressure reduction inside the inner bag 114 does not easily increase. Therefore, in a state where the set pressure of the vacuum pump 154 is set to the reference value, it is possible to determine whether or not the inner bag 114 has a pinhole based on the pressure detected by the pressure gauge 152 after a predetermined time has elapsed. In addition to the flow rate and pressure, whether or not a pinhole is present may be determined based on data such as the contracted state or the contraction time of the inner bag 114. However, from the viewpoint of accuracy, determination based on the flow rate is preferable.

Even if the inner bag 114 has a pinhole after the inner bag 114 and the outer shell 112 are in contact with each other, the pinhole may be closed by the outer shell 112 and the pinhole may be missed, but in the method of the present embodiment, the pinhole is inspected while the inside of the inner bag 114 is depressurized, and therefore, detection of the pinhole is not easily missed.

The leak inspection method of the present embodiment may be performed after a pre-peeling step of peeling the inner bag 114 from the outer shell 112 is performed in advance, or the inner bag 114 may be peeled from the outer shell 112 at the time of inspection without performing the pre-peeling in advance. In this case, the pre-peeling and the leak inspection can be performed simultaneously, which is efficient.

In the case of a double container having high transparency, it is possible to visually confirm whether or not the inner bag 114 has a pinhole, but it is difficult to visually confirm a colored double container. Therefore, the detection method according to the present embodiment is of great technical significance in leak inspection for a colored dual container.

After the leak check is completed, the electromagnetic valve 104 is operated to connect the head member 103 to the pressurization system 106, and the compressor 163 is operated in this state, whereby air can be fed into the inner bag 114, and the inner bag 114 can be inflated. This facilitates the filling process of filling the bag 114 with the contents.

2. Embodiment 2 of viewpoint 2

This embodiment is similar to embodiment 1, with the main difference being the structure of the head member 103. Hereinafter, the difference point will be mainly described.

As shown in fig. 13, in the present embodiment, the head member 103 further includes an insertion member 133 and a seal 134. The insertion member 133 includes a rod-shaped portion 133a and a flange portion 133b protruding in the radial direction at the base end of the rod-shaped portion 133 a. The through hole 134a is provided in the seal 134, and the rod-shaped portion 133a is inserted through the through hole 134a. The material of seal 134 is the same as seal 132. The rod-shaped portion 133a is a rod-shaped portion.

As shown in fig. 14, the through-hole 133 is provided in the insertion member 133, and the rod-like portion 133a is provided with a suction port 133d inserted through the through-hole 133 c. The suction port 133d is provided at the tip 133a1 of the rod 133 a. Since the front end 133a1 is not easily covered by the inner bag 114 after the inner bag 114 is contracted, and the suction port 133d is provided at the front end 133a1, the suction port 133d is not easily closed by the inner bag 114. Since the rod-shaped portion 133a is a portion inserted into the inner bag 114, the side surface and the edge of the front end of the rod-shaped portion 133a are preferably curved so that the rod-shaped portion 133a does not damage the inner bag 114.

According to the above configuration, as shown in fig. 14, when the head base 131 is pressed toward the end surface of the port 109, the head base 131, the flange portion 133b, and the end surface of the port 109 are brought into close contact with each other via the sealing

members

132 and 134, and the interior of the inner bag 114 is communicated with the outside only through the through

holes

131a, 132a, and 133c, so that the interior of the inner bag 114 can be depressurized or pressurized by the depressurization system 105 or the pressurization system 106.

By using the leak inspection method of the present embodiment, the inside of the inner bag 114 can be decompressed in a state where the rod-shaped portion 133a is inserted into the inner bag 114 from the mouth portion 109, and the inner bag 114 can be contracted to check whether or not there is a pinhole in the inner bag 114 (as shown in fig. 15). This method can provide the following effects.

Suppression of uneven peeling of the inner bag 114

As shown in fig. 10, the inner bag 114 has a pair of opposing

portions

114b and 114c that face (face) each other with the nip portion 107d interposed therebetween, and in embodiment 1, as shown in fig. 16, only the portion 114b may be peeled off, and the portion 114c may not be peeled off, so that the inner bag 114 may be unevenly peeled off and shrunk. When the inner bag 114 contracts in this manner, there is a problem that the leak inspection cannot be performed efficiently at the portion 114 c. In the present embodiment, as shown in fig. 15, since the inside of the inner bag 114 is depressurized in a state where the rod-shaped portion 133a is inserted, even if peeling occurs first at the portion 114b, the peeling at the portion 114b is stopped when the portion 114b abuts on the rod-shaped portion 133a, and then the peeling at the portion 114c is performed. Therefore, according to the present embodiment, the inner bag 114 can be prevented from being unevenly peeled, and the leak inspection can be effectively performed.

Suppressing the bottom 114a of the inner bag 114 from floating

In embodiment 1, when the inner bag 114 is further contracted in a state where the inner surfaces of the

portions

114b and 114c are in contact with each other, an upward force is applied to the bottom portion 114a of the inner bag 114, and there is a possibility that the bottom portion 114a is separated from the bottom portion 107b of the dual container 101 and floats as shown in fig. 16. On the other hand, in the present embodiment, as shown in fig. 15, since the rod-shaped portion 133a is disposed between the

portions

114b and 114c, the

portions

114b and 114c do not directly abut against each other, and an upward force can be prevented from being applied to the bottom portion 114a of the inner bag 114, and as a result, the bottom portion 114a can be prevented from separating from and floating from the bottom portion 107b of the dual container 101.

As shown in fig. 14, the total height of the dual container 101 is H, and the length of the portion of the rod 133a inserted into the inner bag 114 is L, and preferably L/H is 0.40 or more. In this case, the above 2 effects can be effectively exerted. L/H is, for example, 0.40 to 0.99, specifically, for example, 0.40, 0.50, 0.60, 0.70, 0.80, 0.90, 0.95, 0.99, or may be a range between any 2 of the numerical values exemplified herein.

As shown in fig. 14, when the diameter of the inscribed circle of the inner peripheral surface of the mouth part 109 is D1 and the diameter of the circumscribed circle of the rod-shaped part 133a is D2, D2/D1 is preferably 0.30 or more. In this case, the above 2 effects can be effectively exerted. D2/D1 is, for example, 0.30 to 0.99, specifically, for example, 0.30, 0.40, 0.50, 0.60, 0.70, 0.80, 0.90, 0.95, 0.99, or may be a range between any 2 of the numerical values exemplified herein.

Further, L/D2 is preferably 3 or more, for example, 3 to 50, specifically 3, 4, 5, 6, 7, 8, 9, 10, 20, 30, 40, 50, or may be a range between any 2 of the numerical values exemplified herein.

Although the present embodiment provides an excellent effect as a leak inspection method, the present embodiment also provides an excellent effect as a pre-peeling method for the double container 101 in terms of obtaining the above 2 effects. Therefore, this view is not necessarily used for leak inspection.

This embodiment can also be implemented as follows.

The suction port 133d may be provided at a position other than the tip of the rod-shaped portion 133 a. When the suction port 133d is provided on the circumferential surface of the rod-shaped portion 133a, the inner bag 114 is preferably provided at a position where the suction port 133d is not easily closed (for example, near the root of the rod-shaped portion 133 a). The number of suction ports 133d may be 2 or more.

The through hole 133c may be provided in the flange portion 133b. In this case, through holes communicating with the through holes 133c are provided at the sealing

members

132, 134. With such a configuration, the interior of the inner bag 114 can be depressurized through the through hole 133c of the flange portion 133b. In this case, the through-hole 133c may be provided in the rod-shaped portion 133a so that the interior of the inner bag 114 can be depressurized through both the rod-shaped portion 133a and the flange portion 133b, or the through-hole 133c may not be provided in the rod-shaped portion 133a, and the interior of the inner bag 114 may be depressurized only from the flange portion 133b.

(embodiment according to viewpoint 3)

1. Is formed integrally

As shown in fig. 18A, a delamination container 201 according to an embodiment of the 3 rd aspect of the present invention includes a container main body 203 having a substantially bottomed cylindrical shape, and a pump 204.

As shown in fig. 19 and 20, the container main body 203 has a bottomed tubular shape, and includes a housing portion 233 having a body portion 231 and a bottom portion 232, and a mouth portion 234 through which the contents are discharged from the housing portion 233. An external thread portion 234a is provided on the outer surface of the mouth portion 234. The container main body 203 of the present embodiment includes the inner bag 206 and the outer shell 207 in the storage portion 233 and the mouth portion 234, and the inner bag 206 is separated from the outer shell 207 and contracted as the content decreases, thereby constituting a structure in which the inner bag 206 is separated from the outer shell 207.

The inner bag 206 includes an EVOH layer provided on the outer surface side of the container, an inner surface layer provided on the inner surface side of the container of the EVOH layer, and an adhesive layer provided between the EVOH layer and the inner surface layer. The provision of the EVOH layer can improve the gas barrier property and the peelability from the outer case 207. However, the adhesive layer may be omitted.

The housing 207 is composed of, for example, low density polyethylene, linear low density polyethylene, high density polyethylene, polypropylene, ethylene-propylene copolymer, mixtures thereof, and the like.

As shown in fig. 21, the pump 204 is configured to discharge the contents from the container main body 203 without introducing the outside air into the container main body 203. The pump 204 includes a body 241, a piston 242, a nozzle 243, and a tube 244. The main body 241 includes a cylindrical portion 241a and a cylinder portion 241b. An internal thread portion (not shown) screwed into the external thread portion 234a of the mouth portion 234 of the container main body 203 is provided on the inner surface of the cylindrical portion 241 a. The lower portion of the cylinder portion 241b is inserted into the mouth portion 234. The outer diameter of the cylinder portion 241b substantially coincides with the inner diameter of the mouth portion 234. The cylinder 241b is cylindrical, and the piston 242 is slidable in the cylinder 241b. The nozzle 243 communicates with the pipe 244 in the internal space of the cylinder 241b. A pump mechanism including an elastic member and a valve is built in the internal space of the cylinder portion 241b. By operating the pump mechanism by sliding the piston portion 242, the contents sucked up through the tube 244 can be discharged from the nozzle 243.

2. Construction of the bottom 232

The structure of the bottom 232 of the container main body 203 will be specifically described below with reference to fig. 22A to 23B. As shown in fig. 22A, 22B, 18B, 19, and the like, the bottom portion 232 of the present embodiment includes a pinch-off portion 232p at the center thereof. The pinch-off portion 232P is a band-shaped structure, which will be described later, formed by flattening the lower end of the laminated parison P by the

nip portions

221X, 221Y (refer to fig. 24A) of the

split molds

202X, 202Y. The bottom portion 232 has a double structure of the inner bag 206 and the outer shell 207 as described above, and is configured by fitting the inner bag bottom portion 260 shown in fig. 23A and the outer shell bottom portion 270 shown in fig. 23B.

As shown in fig. 22A and 23A, the inner bag bottom 260 has an inner bag protruding portion 261 protruding outward at the pinch-off portion 232p. As shown in fig. 23A and 23B, the case bottom 270 has a clamping portion 271 at the pinch-off portion 232p, which clamps the inner bag protruding portion 261. The outside air introduction hole 208 is provided between the inner bag protruding portion 261 and the clamp portion 271 (see fig. 22A, 23B, and 18B). In the present embodiment, the inner bag protruding portion 261 and the clamping portion 271 do not protrude from the bottom portion 232, but may be configured to protrude from the bottom portion 232. After the container main body 203 is molded, the inner bag protruding portion 261 and the holding portion 271 are brought into close contact with each other, and the outside air introduction hole 208 is not provided. However, since the inner bag protruding portion 261 and the clip portion 271 are easily peeled off, when an impact force or a reverse force is applied to separate the inner bag protruding portion 261 and the clip portion 271, the inner bag protruding portion 261 and the clip portion 271 can be peeled off and the outside air introduction hole 208 can be formed therebetween. Since the container main body 203 has the outside air introduction hole 208, the outside air is introduced between the outer shell 207 and the inner bag 206 as the content decreases, and only the inner bag 206 can be contracted.

As shown in fig. 22A, 22B, and the like, the container main body 203 of the present embodiment has a thickness reservoir 209 formed at the end in the longitudinal direction of the pinch-off portion 232p, and the thickness reservoir serves as an engagement portion for engaging the inner bag 206 and the outer shell 207. Specifically, as shown in fig. 22B and 23A, the inner bag 206 (inner bag bottom portion 260) includes a pair of protrusions 262 protruding outward in the radial direction in the thickness reservoir 209. As shown in fig. 22B and 23B, the housing 207 (housing bottom portion 270) includes a pair of concave portions 272 that engage with the convex portions 262 in the thickness reservoir 209. In the container main body 203 of the present embodiment, since the convex portion 262 of the inner bag 206 is engaged with the concave portion 272 of the outer case 207 in the thickness reservoir 209, the bottom portion 232 is not easily detached from the inner bag 206 even if the inner bag 206 is contracted as the content decreases. Note that the convex portion 262 and the concave portion 272 of the present embodiment are integrally molded by blow molding which will be described later, and the convex portion 262 and the concave portion 272 have a shape of being tightly fitted.

As shown in fig. 22B, the projection 262 is formed so that the projection amount d1 in the longitudinal direction is 0.15 times or more the length d2 in the longitudinal direction from the center X of the bottom 232 to the tip of the projection 262. The ratio of d1/d2 is preferably 0.18 or more, more preferably 0.20 or more. The ratio d1/d2 is, for example, 0.15 to 0.30, more preferably 0.20 to 0.25. Specifically, for example, the following may be mentioned: 0.15, 0.16, 0.17, 0.18, 0.19, 0.20, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.30, or may be a range between any 2 of the values exemplified herein. Note that the "projection amount d1 in the longitudinal direction of the projection 262" means: as shown in fig. 22B, the amount of protrusion of the inner bag bottom portion 260 from the position where the inner bag bottom portion 260 is the most constricted is on the cross section of the inner bag bottom portion 260 at the pinch-off portion 232p. The length of the projection d1 is 1.5mm or more. The projection amount d1 is preferably 2.0mm or more. The projection d1 is preferably 2.0mm to 6.0mm, more preferably 2.5mm to 5.5mm, and still more preferably 3.5mm to 4.5mm. Specific numerical values of the projection amount d1 are, for example, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 5.0, 5.1, 5.2, 5.3, 5.4, 5.5, 5.6, 5.7, 5.8, 5.9, 6.0, or may be a range between any 2 of the numerical values exemplified herein. As shown in fig. 22A, the tip of the projection 262 of the present embodiment projects to substantially the same position in the radial direction as the edge of the bottom surface of the inner bag 206. However, the inner bag 206 may be configured to protrude outward beyond the edge of the bottom surface thereof. The tip of the projection 262 may be positioned inward of the edge of the bottom surface of the inner bag 206, as long as the projection amount d1 of the projection 262 is sufficiently ensured.

3. Manufacturing method

Next, a method of manufacturing the laminated and peeled container 201, particularly a blow molding step, as described above will be described with reference to fig. 24A to 26B.

As shown in fig. 24A and 24B, in the present embodiment, the container main body 203 is formed by blow molding a cylindrical laminated parison P extruded from an extruder 205. The laminated parison P in a molten state is extruded from a die head 205a (die head), and is closed-molded by a pair of split dies 202X and 202Y of the blow molding die 202. The

split molds

202X and 202Y have cavity shapes of various shapes for forming the container body 203 such as the body 231, the bottom 232, and the mouth 234 in the blow-molded article.

As shown in fig. 24A, the die diameter of the die 205a for extruding the laminated parison (i.e., the diameter d3 of the laminated parison P extruded from the die 205 a) is the inner diameter of the portion where the bottom is formed out of the inner diameters of the split dies 202X, 202Y, and is 2/pi times or less the diameter d4 of the bottom 232 (bottom surface). Under such conditions, even if the laminated parison P is flattened from a cylindrical state to a flat state by the mold closing, the folded diameter (which substantially coincides with the width of the pinch-off portion 232P after molding) which is the width of the flattened laminated parison P becomes smaller than the inner diameter d4 of the portion forming the bottom portion 232 of the container body 203. As a result, the collapsed laminated parison P can flow radially outward in the container during blow molding, and the thickness reservoir 209 is easily formed. The ratio d3/d4 is, for example, 0.1 to 0.63, more preferably 0.19 to 0.42. The ratio d3/d4 is in particular, for example, 0.19, 0.20, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.30, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.40, 0.41, 0.42, or may also be a range between any 2 of the values exemplified herein.

As shown in fig. 24B, in the present embodiment, the diameter d3 of the laminated parison P is set to be slightly smaller than the inner diameter d5 of the portion of the inner diameter of the blow mold 202 where the mouth 234 of the container body 203 is formed. The ratio d3/d5 is, for example, 0.6 to 0.9, more preferably 0.7 to 0.8. The ratio d3/d5 is in particular 0.70, 0.71, 0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78, 0.79, 0.80 or may also be a range between any 2 of the values exemplified herein. If the diameter d3 of the laminated parison P is too large relative to the inner diameter d5 of the portion where the mouth 234 is formed, burrs or the like may be caught during mold closing, and if the diameter d3 of the laminated parison P is too small, the blow ratio becomes too large and molding becomes difficult. However, by setting the ratio d3/d5 to the above value, the mouth portion 234 can be formed appropriately.

The formation of the bottom 232 of the container body 203 by the blow mold 202 will be described in detail below. As shown in fig. 24A, the

split molds

202X and 202Y of the blow mold 202 include snap-in

portions

221X and 221Y, respectively. As shown in fig. 24A to 25B, the blow mold 202 includes a compression portion 222 below the

snap portions

221X and 221Y. The compression portion 222 is formed by the

split molds

202X and 202Y, and compresses the laminated parison P when the mold is closed.

As shown in fig. 24B and 25B, in the present embodiment, the compression portion 222 includes 1 st compression regions 222a formed in the vicinity of both ends of the biting

portions

221X and 221Y in the longitudinal direction, and 2 nd compression regions 222B formed between the 1 st compression regions 222 a. The 1 st compressed region 222a has a width d6 when the mold is closed smaller than a width d7 when the mold is closed in the 2 nd compressed region. The width d6 of the 1 st compressed region 222a when the mold is closed is preferably equal to or less than the thickness d8 (see fig. 26A) of the laminated parison P. The width d6 of the 1 st compressed region 222a when the mold is closed is preferably 1mm or less, more preferably 0.2mm or less. The width d6 is preferably a distance between the molds at which both are not completely in contact with each other, and is preferably 0.01mm or more, for example. The width d6 has a value of 0.01mm to 1.00mm, preferably 0.05mm to 0.20mm. Specifically, it may be 0.05, 0.06, 0.07, 0.08, 0.09, 0.10, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.20mm, or may be a range between any 2 of the numerical values exemplified herein. The width d7 of the 2 nd compression region 222b when the mold is closed is preferably 2 times or less the thickness d8 of the laminated parison P. The width d7 is preferably 10mm or less, more preferably 8mm or less. The width d7 is, for example, 1.0mm to 6.0mm, more preferably 2.0mm to 5.0mm, and still more preferably 3.0mm to 4.0mm. Specifically, it may be 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 5.0, 5.1, 5.2, 5.3, 5.4, 5.5, 5.6, 5.7, 5.8, 5.9, 6.0mm, or any range between 2 of the values exemplified herein.

Fig. 26A to 26C show a state in which the parison P is stacked while being suspended from the blow mold 202 configured as described above, and the pair of

split molds

202X and 202Y are closed gradually. When the

split molds

202X and 202Y are closed from the state before the mold closing shown in fig. 26A, the biting

portions

221X and 221Y of the

split molds

202X and 202Y press the cylindrical laminated parison P inward, and as shown in fig. 26B, the inner surfaces (layers forming the inner bag 206) of the laminated parison P first come into contact with each other. When the

split molds

202X and 202Y are further closed from this state, the snapping-off

portions

221X and 221Y and the compression portion 222 compress the laminated parison P. Then, the mold is completely closed as shown in fig. 26C, and the laminated parison P is separated into 2 parts by the snap-off

parts

221X, 221Y, and a pinch-off part 232P is formed on the container side.

After the mold closing as described above, the blow nozzle is inserted into the opening portion on the side of the mouth portion 234 of the container main body 203, and air is taken in and out of the cavity of the split mold in the state where the mold closing is performed. Subsequently, the split mold is opened to take out the blow-molded article, and the lower burr formed at the lower portion of the pinch-off portion 232p is removed. The molded article formed as described above is subjected to a known inner layer pre-peeling step and the external air introduction hole 208 forming step as described above, thereby completing the container main body 203. Finally, the pump 204 is attached to the mouth 234 of the container main body 203, whereby the laminated peel container 201 of the present embodiment is finally completed.

When the

split molds

202X and 202Y shown in fig. 26B to 26C are closed, the laminated parison P is gradually compressed. In this case, in the present embodiment, since the blow mold 202 has the compression portion 222, the lower portion (container outer side) of the

nip portions

221X and 221Y of the laminated parison P is more compressible than the upper portion (container inner side). Therefore, the collapsed laminated parison P easily flows in the container inner direction (the direction of the arrow in fig. 26B) having a wide space.

In other words, the compressing portion 222 of the present embodiment includes the 1 st compressing region 222a and the 2 nd compressing region 222b, and the width d6 of the 1 st compressing region 222a in the vicinity of both ends of the biting

portions

221X and 221Y in the longitudinal direction is narrower than the width d7 of the 2 nd compressing region 222b. In this manner, the laminated parison P crushed by the compression portion 222 can be prevented from spreading in the lateral direction (the longitudinal direction of the

nip portions

221X and 221Y, the left-right direction in fig. 24B). Therefore, the laminated parison P is moved in the longitudinal direction and pushed back into the cavity, so that the laminated parison P is more likely to flow in the inside direction of the container. Further, by blowing air in a state where the laminated parison P is pushed back by the compression portion 222 to perform blow molding, the thickness reservoir 209 can be formed appropriately, and the inner bag 206 can be made to bite into the outer shell 207. As a result, the projection amount d1 of the projection 262 of the inner bag 206 can be increased, and the engagement with the recess 272 of the housing 207 can be enhanced, so that the inner bag 206 can be prevented from being detached from the bottom 232.

In the conventional manufacturing method, the laminated parison P is compressed by the compression unit 222. However, in the conventional manufacturing method, since the width of the compression portion 222 is fixed, the projection amount d1 of the projection 262 of the inner bag 206 cannot be sufficiently obtained. In this regard, with the manufacturing method of the present embodiment, the projection amount d1 can be increased by configuring the compressed portion 222 from the 1 st compressed region 222a and the 2 nd compressed region 222b as described above. Thereby, the ratio d1/d2 of the projection amount d1 in the longitudinal direction of the projection 262 to the length d2 in the longitudinal direction from the center X of the bottom portion 232 to the tip of the projection 262 can also be increased as described above. (refer to fig. 22B).

In the delamination container 201 of the present embodiment, as described above, the convex portion 262 of the inner bag 206 is engaged with the concave portion 272 of the outer case 207 in the thickness reservoir 209, so that the inner bag 206 is difficult to detach from the bottom portion 232, but this does not mean that the inner bag 206 cannot be completely detached. That is, only the convex portion 262 of the inner bag 206 engages with the concave portion 272 of the outer case 207, and when the remaining amount of the contents in the delamination container 201 becomes small, the contraction amount of the inner bag 206 becomes large, and the engagement between the convex portion 262 and the concave portion 272 can be released by deforming the inner bag 206. As a result, the inner bag 206 can become more freely deformable, and the content sucked by the pump 204 can be accumulated at the end of the tube 244, so that the finally remaining content can be discharged.

4. Modification example

The invention according to claim 3 can be implemented as follows.

In the above-described embodiment, as shown in fig. 25A and 25B, the pair of

split molds

202X and 202Y of the blow mold 202 completely abut on each other at the outer position of the 1 st compressed region 222 a. However, the blow mold 202 of the present invention is not limited thereto. That is, as shown in fig. 27A, the 1 st compressed region 222a may be connected to the end of the mold. As shown in fig. 27B, in a region outside the 1 st compression region 222a (i.e., a position where the laminated parison P does not reach during closing), the gap between the pair of

split molds

202X and 202Y may be configured to be larger than the width d6 of the 1 st compression region 222 a.

In the above-described embodiment, the stacking and peeling container 201 is configured to discharge the contents by the pump 204, but the container main body 203 may be squeezed to discharge the contents.

In the above embodiment, the outside air introduction hole 208 is provided in the bottom portion 232, but may be provided in the body portion 231. In this case, it is preferable to provide a valve member at the outside air introduction hole 208.

Description of the symbols

(1 st aspect) 1: stacking separation container, 2: container body, 3: valve member, 4: a cover, 5: housing portion, 5a: valve member mounting recess, 5b: air circulation groove, 6: mouth portion, 6a: external thread portion, 7: shoulder, 8: air introduction hole, 12: outer shell, 14: inner bag, 21: ride, 21a: inclined portion, 22: stopper, 22f: tapered surface, 22g: tapered surface, 23: recess, 34: seal, 41: lid body, 42: hinge, 43: cover, 44: main cover member, 44a: outer tube portion, 44b: inner tube portion, 44c: annular portion, 44d: internal thread portion, 44e: diameter-expanded portion, 44f: projection, 44g: valve seat, 45: check valve, 45a: valve body, 45b: elastic sheet, 46: discharge member, 46a: discharge port, G: space, H1: height, H2: height, T1: projection width, T2: projection width, W1: width, W2: width.

(viewpoint 2)

101: double container, 102: leak inspection device, 103: a head part, 104: electromagnetic valve, 105: pressure reduction system, 106: pressurization system, 107: accommodating portion, 107a: trunk portion, 107b: bottom, 107d: snap-in portion, 108: piping, 108a: piping, 108b: piping, 108c: piping, 109: mouth part, 112: housing, 114: inner bag, 114a: bottom, 114b: site, 114c: site, 115: outside air introducing unit, 131: head component base, 131a: through-hole, 131b: housing recess, 132: seal, 132a: through-hole, 133: insertion member, 133a: rod-shaped portion, 133a1: front end, 133b: flange portion, 133c: through-hole, 133d: suction port, 134: seal, 134a: through-hole, 151: flow meter, 152: pressure gauge, 153: regulator, 154: vacuum pump, 161: speed controller, 162: regulator, 163: a compressor.

(viewpoint 3)

201: laminated release container, 202: blow molding die, 202X: split mold, 202Y: mold division, 203: container body, 204: pump, 205: extruder, 205a: die head, 206: inner bag, 207: a housing, 208: external air introduction hole, 209: thickness reservoir, 221X: snap-off portion, 221Y: snap-off portion, 222: compression section, 222a: 1 st compression region, 222b: compression area 2, 231: trunk, 232: bottom, 232p: pinch-off portion, 233: housing section, 234: mouth portion, 234a: external thread portion, 241: main body portion, 241a: tube portion, 241b: cylinder section, 242: piston section, 243: nozzle, 244: tube, 260: inner bag bottom, 261: inner bag protrusion, 262: convex portion, 270: housing bottom, 271: clamping portion, 272: recess, P: laminated parison, R: region, X: center, d1: projection amount, d2: length from the center of the bottom to the tip of the convex portion, d3: diameter of laminated parison P, d4: diameter of bottom, d5: inner diameter of portion forming the mouth, d6: width of 1 st compressed region, d7: width of 2 nd compressed region, d8: the thickness of the laminated parison P.

Claims

1. A lidded container having a container body and a lid, wherein,

the cap has an internal thread portion, the container body has an external thread portion at the mouth portion to be screwed with the internal thread portion,

the lid has a protrusion at a position closer to the container body side than the female screw portion,

the container body includes a riding part engaged with the protrusion to restrict loosening of the lid, and a stopper part located on a side of a fastening direction of a screw of the riding part to restrict overrun of the lid,

the container body is configured to have an outer shell and an inner bag and the inner bag is contracted as the content decreases,

a valve member mounting recess is formed in the housing, an air introduction hole is formed in the valve member mounting recess, a valve member is mounted to the air introduction hole,

the ride portion and the stopper portion are provided at substantially the same position in the circumferential direction as the valve member mounting recess portion or at positions opposite in the circumferential direction.

2. The lidded container of claim 1 wherein,

the stopper is set to have a height larger than a height of the ride portion, and/or the stopper is set to have a protruding width in a radial direction larger than a protruding width of the ride portion in the radial direction.

3. The capped container of claim 1 or 2, wherein,

the protrusions are provided at circumferentially opposite 2,

the ride portion and the stopper portion are respectively provided at circumferentially opposite 2.

4. The lidded container of claim 3 wherein,

the height of the stop that limits the overrun of one projection is substantially the maximum height that does not interfere with the other projection.

5. The capped container of claim 4, wherein,

the stopper portion has a tapered surface that prevents interference with the other protrusion on a fastening direction side of the thread in a circumferential direction.