TWI827742B - Leak detection method of lidded container, double container, stacked peeling container and method of manufacturing the same - Google Patents

Abstract

Provided is a lidded container capable of preventing lid overrun.

According to the present invention, there is provided a lidded container having a container body and a lid, wherein the lid is provided with an internal thread portion, the container body is provided with an external thread portion threadedly engaged with the internal thread portion at its mouth, and the lid is provided with a threaded portion than the internal thread portion. The container body is provided with a protrusion at a position close to the container body, and the container body is provided with a riding portion that engages with the protrusion to limit loosening of the lid, and a stopper portion located closer to the tightening direction side of the thread than the riding portion and that limits overrun of the lid.

Description

Leak detection methods for lidded containers and double containers, stacked peeling Separation container and manufacturing method thereof

The present invention relates to a lidded container, a leakage inspection method for a double container, a stacked peelable container, and a manufacturing method thereof.

(1st point of view)

There is known a container with a lid that has a container body having a mouth formed with an externally threaded portion and a lid formed with an internally threaded portion. For example, Patent Document 1 discloses a structure in which a riding portion (protrusion) is provided at the terminal portion of the thread of the male thread portion in order to prevent loosening when the cap is tightened by screwing. With this configuration, the end point of tightening can be grasped by a click sensation caused when the protrusion provided on the lower surface of the cover exceeds the riding portion.

(2nd point of view)

Patent document 2 detects whether there is a hole in the inner bag based on whether the pressure in the inner bag reaches a specified value after supplying air into the inner bag and a prescribed time has elapsed.

(3rd point of view)

A laminated peelable container is known which has an outer shell and an inner bag and the inner bag shrinks as the content decreases (for example, Patent Document 3). Such a laminated peeling container is generally manufactured by blow molding using a cylindrical laminated parison.

【Prior technology】

【Patent document】

Patent document 1: Japanese Patent Application Publication No. 2006-3406460

Patent document 2: Japanese Patent No. 3303234

Patent document 3: Japanese Patent No. 3401519

(1st point of view)

In the structure of the above-mentioned patent document 1, when the protrusion of the cover exceeds the riding part, in principle, the cover can be tightened further, but over-tightening (overrun, over-tightening) may still occur.

The present invention was made in view of such circumstances, and provides a container with a lid that can prevent the lid from exceeding the limit.

(2nd point of view)

In the method of Patent Document 2, when air is supplied to the inner bag and the inner bag expands unexpectedly, it will be determined that there is a hole in the inner bag regardless of whether there is a hole in the inner bag. Therefore, it is desirable to use other means of leak detection methods.

The present invention was made in view of the above situation, and provides a leakage inspection method capable of detecting the presence of pinholes in the inner bag of a double container.

(3rd point of view)

Although the bottom of the laminated peeling container shown in Patent Document 3 is provided with a pinch portion (sealing portion) for welding one end of the laminated parison, the inner bag may be separated from the bottom at the pinch portion. If the inner bag is detached from the bottom while the contents remain in the inner bag, the way the inner bag shrinks cannot be restricted, which may cause blockage of the flow path or even the formation of pinholes. In the laminated peeling container of Patent Document 3, the welded layer at the pinched portion is welded by engaging the plurality of engaging portions with each other. However, in order to realize this structure, the structure of the mold is complicated. And the production cost is high. In such a structure, 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 shell and the inner bag.

The present invention has been made in view of the above-mentioned circumstances, and provides a laminated peeling container in which detachment of the inner bag from the bottom is restricted.

(1st point of view)

According to the present invention, there is provided a lidded container having a container body and a lid, and the lid is provided with an internal thread. a threaded portion, the container body has an external threaded portion at the mouth that is threaded with the internally threaded portion, the lid is provided with a protrusion at a position closer to the container body than the internally threaded portion, and the container body is provided with A riding part and a stopper part, the riding part engages with the protrusion to limit the loosening of the cover, and the stopper part is located on the tightening direction side of the thread of the riding part to limit overshooting of the cover .

According to the present invention, since the container body is provided with the stopper portion closer to the tightening direction side than the riding portion, it is possible to prevent the lid from overshooting.

Preferably, the height of the stopper is set to be greater than the height of the riding part, and/or the protruding width of the stopping part in the radial direction is set to be larger than the protrusion of the riding part in the radial direction. Large width.

Preferably, the protrusions are provided at two circumferentially opposite locations, and the riding portion and the stopper portion are respectively provided at two circumferentially opposite locations.

Preferably, the height of the stopper that limits the overrun of one protrusion is approximately the maximum height that does not interfere with the other protrusion.

Preferably, the stopper portion has a tapered surface on a tightening direction side of the thread in the circumferential direction to prevent interference with the other protrusion.

Preferably, the container body has an outer shell and an inner bag and the inner bag shrinks as the content decreases.

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 the air introduction hole in the circumferential direction or at positions opposite to the air introduction hole in the circumferential direction.

(2nd point of view)

According to the present invention, there is provided a leak detection method of a double container configured to have an outer shell and an inner bag and the inner bag shrinks as the content decreases, the method including based on the internal depressurization of the inner bag. The obtained data is used to determine whether there are pinholes in the inner bag.

Data such as the flow rate of air sucked out from the inside of the inner bag or the pressure of decompression when the inner bag is depressurized will differ depending on whether there are pinholes in the inner bag. Based on this difference, it can be determined whether there is a pinhole in the inner bag.

Various examples of the present invention are illustrated below. The embodiments shown below can be combined with each other.

Preferably, the method is wherein the determination is based on the air flow rate sucked from the inner bag during the decompression.

Preferably, in the method, the pressure reduction is performed with the rod-shaped portion inserted into the inner bag from the mouth of the double container.

Preferred is a pre-peeling method for a double container, wherein the double container is configured to have an outer shell and an inner bag and the inner bag shrinks as the content decreases, the method including moving from the mouth of the double container to the inner bag. A peeling step in which the inner bag is peeled off from the outer shell by depressurizing the inside of the inner bag with the rod-shaped portion inserted into the bag.

Preferably, in this method, the overall height of the double container is H, 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.

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

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

Preferably, in the method, the suction port is provided at the front end of the rod-shaped part.

(3rd point of view)

According to the present invention, there is provided a laminated peelable container having an outer shell and an inner bag and in which the inner bag shrinks as the contents are reduced. The laminated peelable container is provided with an accommodating portion for accommodating contents and a clip formed at the bottom of the accommodating portion. The breaking portion is provided with an engaging portion for engaging the outer shell and the inner bag at an end portion of the pinching portion in the longitudinal direction, and the inner bag is provided with an engaging portion extending in the longitudinal direction at the engaging portion. The protruding convex part on the outside,

The housing is provided with a recessed portion that engages with the convex portion at the engaging portion, and the protrusion amount of the convex portion in the longitudinal direction is from the center of the bottom to the front end of the convex portion. More than 0.15 times the length in the longitudinal direction.

According to the present invention, an engaging portion is provided at the end of the pinch portion in the longitudinal direction, and the convex portion of the inner bag engages with the concave portion of the outer shell at the engaging portion, thereby restricting detachment of the inner bag.

Various embodiments of the present invention are illustrated below. The embodiments shown below can be combined with each other.

It is preferable that the front end of the convex portion protrudes to approximately the same position in the radial direction as the edge of the bottom surface of the inner bag, or protrudes further outward than the edge of the bottom surface of the inner bag.

Preferably, the pinching portion is provided with an external air introduction hole for introducing external air into the space between the outer shell and the inner bag.

Furthermore, according to the present invention, there is provided a method for manufacturing a laminated peelable container having an outer shell and an inner bag and in which the inner bag shrinks as the content is reduced, including a blow molding step using a cylindrical laminated parison, the mold A compression portion that compresses the laminated parison and causes the laminated parison to flow toward the inside of the container is provided near the bite portion forming the pinch portion of the laminated peeling container. The compression portion includes a first compression region formed near both ends in the longitudinal direction of the bite portion, and a second compression region formed between the first compression regions, said The width of the first compression region when the mold is closed is narrower than the width of the second compression region when the mold is closed.

The diameter of the die for extruding the laminated parison is preferably 2/π times or less the inner diameter of the portion forming the bottom among the inner diameters of the mold.

Preferably, the width of the first compression region when the mold is closed is less than or equal to the thickness of the laminated parison, and the width of the second compression region when the mold is closed is not more than twice the thickness of the laminated parison.

It is preferable that the width of the second compression region when the mold is closed is 5 mm or less.

(1st point of view)

1: Stacked peeling containers

2: Container body

3: Valve parts

4: cover

5: Containment Department

5a: Valve component mounting recess

5b: Air circulation slot

6: Mouth

6a: External thread part

7:Shoulder

8:Air inlet hole

12: Shell

14:Inner bag

21: Riding Department

21a: Inclined part

22: Stopper

22f: Tapered surface

22g: tapered noodles

23: concave part

34:Seals

41: cover body

42:hinge

43:Cover

44:Main cover parts

44a: Outer cylinder part

44b: Inner barrel part

44c: ring part

44d: Internal thread part

44e: Expanded diameter part

44f:Protrusion

44g: valve seat

45: Check valve

45a: Valve body

45b: Elastic sheet

46:Spitting out parts

46a: spit out

G: space

H1: height

H2: height

T1: protruding width

T2: protruding width

W1: Width

W2: Width

(2nd point of view)

101:Double container

102: Leak detection device

103:Head parts

104:Solenoid valve

105: Pressure reduction system

106: Pressurized system

107: Containment Department

107a: Torso

107b: Bottom

107d:bite part

108:Piping

108a:Piping

108b:Piping

108c:Piping

109: Mouth

112: Shell

114:Inner bag

114a: Bottom

114b: Part

114c: parts

115: Outside air introduction part

131:Head part base

131a:Through hole

131b: Containment recess

132:Seals

132a:Through hole

133:Insert parts

133a: Rod-shaped part

133a1:Front end

133b: Flange part

133c:Through hole

133d:suction port

134:Seals

134a:Through hole

151:Flowmeter

152: Pressure gauge

153:Regulator

154: Vacuum pump

161: Speed controller

162:Regulator

163:Compressor

(3rd point of view)

201: Stacked Peel Containers

202: Molds for blow molding

202X: Split mold

202Y: Split mold

203:Container body

204:Pump

205:Extruder

205a: Die head

206:Inner bag

207: Shell

208: External air introduction hole

209:Thickness accumulation department

221X:Bite off part

221Y:Bite off part

222:Compression Department

222a: 1st compression area

222b: 2nd compression area

231: Torso

232:Bottom

232p: Pinch-off part

233: Containment Department

234: Mouth

234a: External threaded part

241: Ontology Department

241a: Barrel

241b:Cylinder part

242:Piston part

243:Nozzle

244:tube

260: Bottom of inner bag

261: Inner bag protrusion

262:convex part

270:Bottom of shell

271: Clamping part

272: concave part

P: laminated parison

R:Region

X:center

d1: protrusion amount

d2: Length from the center of the bottom to the front end of the convex part

d3: Diameter of laminated parison P

d4: diameter of the bottom

d5: Inner diameter of the part forming the mouth

d6: Width of the first compression area

d7: Width of the second compression area

d8: Thickness of laminated parison P

FIG. 1 is a front perspective view of the container body 2 of the laminated peelable container 1 according to the embodiment of the first aspect of the present invention.

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

FIG. 3 is a cross-sectional view of the main components showing a state in which the lid 4 is attached to the container body 2 in FIG. 1 .

FIG. 4A is an enlarged view of the X part in FIG. 3 , and FIG. 4B is an enlarged view of the Y part in FIG. 3 .

FIG. 5 is a cross-sectional view along line A-A in FIG. 3 .

FIG. 6A is an enlarged front view of a main part of the container body 2 in FIG. 1 , and FIG. 6B is an enlarged front view of a main part of the container body 2 in FIG. 1 .

FIG. 7 is a perspective view of the double container 101 that is a target of leakage inspection according to the second aspect of the present invention.

FIG. 8 is a block diagram of the leakage inspection device 102 according to the first embodiment of the second aspect 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 cross-sectional view showing a state in which the head member 103 in FIG. 9 is brought into contact with the end surface of the mouth 109 of the double container 101 .

FIG. 11 is a cross-sectional view showing a state in which the inner bag 114 is contracted by reducing the pressure in the inner bag 114 from the state in FIG. 10 .

FIG. 12 is a diagram showing the relationship between time and 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 leakage inspection device 102 according to the second embodiment of the second aspect of the present invention.

FIG. 14 shows the end of the mouth 109 of the double container 101 being brought into contact with the head member 103 of FIG. 13 . Cross-sectional view of the state behind the surface.

FIG. 15 is a cross-sectional view showing a state in which the inner bag 114 is contracted by reducing the pressure in the inner bag 114 from the state in FIG. 14 .

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

FIG. 17 is a cross-sectional view showing a state in which the bottom 114 a of the inner bag 114 is raised after further depressurizing the inside of the inner bag 114 from the state of FIG. 11 .

FIG. 18A is a perspective view of the laminated peeling container 201 according to an embodiment of the third aspect of the present invention, and FIG. 18B is a perspective view showing the bottom 232 of the laminated peeling container 201 in FIG. 18A .

Fig. 19 is a cross-sectional view of the container body 203 of the stacked peeling container 201 in Fig. 18A.

FIG. 20 is a cross-sectional view of the container body 203 taken along a cross-section perpendicular to the cross-section in FIG. 19 .

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

FIG. 22A is an enlarged view of the bottom part 232 in the cross-sectional view of FIG. 19 , and FIG. 22B is an enlarged view of the bottom part 232 of the cross-sectional view in FIG. 20 .

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

FIG. 24A is a schematic end view showing the blow molding mold 202 used in the manufacturing step of the laminated peeling container 201 in FIG. 18 , taken from the direction perpendicular to the divided plane, and FIG. 24B is the divided molds 202X and 202Y. Schematic diagram of the split surface.

FIG. 25A is a cross-sectional view along line A-A in FIGS. 24A and 24B , and FIG. 25B is an enlarged view of the region R in FIG. 25A .

Figures 26A to 26C show a pair of divided molds 202X and 202Y being gradually closed, a closed mold stacked type An explanatory diagram of the state of blank P.

FIG. 27A shows modification 1 of the split molds 202X and 202Y shown in FIG. 25B , and FIG. 27B shows modification 2 of the same split molds 202X and 202Y.

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 characteristic matter independently enables the present invention to be established.

(Embodiment of the first aspect)

The laminated peelable container 1 as a lidded container according to the embodiment of the first aspect of the present invention includes: a substantially bottomed cylindrical container body 2 as shown in FIGS. 1 to 3 ; and a valve as shown in FIG. 3 Part 3; and threaded cap 4.

As shown in FIG. 1 , the container body 2 includes a storage portion 5 that stores contents, a mouth portion 6 that discharges the contents from the storage portion 5 , and a shoulder portion 7 . In this embodiment, the diameter of the mouth 6 is smaller than the diameter of the receiving part 5 , and the receiving part 5 and the mouth 6 are connected by a 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 receiving part 5 , the mouth part 6 and the shoulder part 7 . The inner bag 14 separates and shrinks from the outer shell 12 as the content decreases. On the side of the accommodating part 5, only the housing 12 is provided with an air introduction hole 8. Furthermore, a male thread portion 6 a is provided on the outer peripheral surface of the mouth portion 6 .

In addition, as shown in FIGS. 1 and 2 , the container body 2 of this embodiment is provided with a riding portion 21 and a stopper 22 at the boundary portion between the mouth portion 6 and the shoulder portion 7 . The stopper 22 is provided closer to the tightening direction side (clockwise direction in FIGS. 1 and 2 ) of the thread of the external thread 6 a than the riding part 21 . The riding portion 21 is engaged with a protrusion 44f of the cover 4 which will be described later, thereby restricting the cover 4 from loosening. The stopper 22 restricts the movement of the protrusion 44f and restricts the cover 4 from protruding. A recessed portion 23 is formed at a position between the riding portion 21 and the stopper portion 22, and the protrusion 44f is positioned in the recessed portion 23 when the cover 4 is screwed onto the mouth portion 6. In this embodiment, as shown in FIG. 2 , the riding portion 21 and the stopper portion 22 are provided in pairs at positions facing each other in the circumferential direction.

As shown in FIG. 3 , the valve member 3 is inserted into the air introduction hole 8 . The valve member 3 is configured to adjust the air inlet and outlet between the space G between the outer shell 12 and the inner bag 14 and the outside. As the structure of the valve member 3, for example, by moving the valve member 3 to open or close the gap between the edge of the air introduction hole 8 and the valve member 3, the valve member 3 can open or close the air introduction hole 8 (see FIG. 3 ); or a valve capable of opening or closing the 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 inlet hole 8 . In addition, the valve member 3 may not be provided, but a film may be attached to the air inlet hole 8 to adjust the air inlet and outlet, or the air inlet and outlet may be adjusted 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, or may be configured to close the air inlet hole 8 when the outer shell 12 is compressed so that the inner bag 14 is in a compressible state, and when the compressive force on the outer shell 12 is released, the outside air is Import into space G.

After the valve component 3 is installed, the housing 5 is shrunk. At this time, the valve member mounting recess 5a is formed in the accommodating portion 5 so that the valve member 3 does not interfere with the shrink film. In addition, an air flow groove 5b extending from the valve member mounting recessed portion 5a toward the shoulder 7 is provided so that the valve member mounting recessed portion 5a is not sealed by the shrink film (see Fig. 1 ).

In addition, in this embodiment, the valve member mounting recessed portion 5a and the air flow groove 5b are provided at substantially the same position in the circumferential direction of the pair of riding portions 21 and the stopper portion 22 or at positions facing each other in the circumferential direction. With such a positional relationship, when the valve member 3 is installed near the riding part 21 and the stopper part 22, the inner bag 14 near the air introduction hole 8 is pre-peeled from the outer shell 12, so that the inner bag 14 and the outer shell 12 become inseparable. It is easy to come into close contact and the inner bag 14 becomes easy to peel off when the contents are discharged.

Furthermore, with this positional relationship, when the container body 2 of this embodiment is formed by blow molding, the valve member mounting recessed portion 5a and the air flow groove 5b around the air introduction hole 8 can be combined with the riding portion 21 and the stopper portion 22 Together, they are formed at a position that is 90 degrees offset from the parting line. In this manner, undercuts can be avoided during the formation of the valve member mounting recessed portion 5a, the air flow groove 5b, the riding portion 21, and the stopper portion 22.

As shown in FIG. 3 , the cover 4 includes a cover body 41 and a cover cover 43 connected to the cover body 41 via a hinge 42 . The cap body 41 is composed of three components: a main cap member 44, a check valve 45, and a discharge member 46.

The main cover member 44 is composed of an outer cylindrical portion 44a, an inner cylindrical portion 44b, and a ring connecting their upper ends. It is composed of shaped part 44c. An internal thread portion 44d that is threadedly engaged with the external thread portion 6a of the mouth portion 6 of the container body 2 is formed on the inner peripheral surface of the outer cylinder portion 44a. Furthermore, as shown in FIGS. 3 , 4A and 4B , an enlarged diameter portion 44 e having a larger diameter is formed at an end portion located below the internal thread portion 44 d of the outer cylinder portion 44 a (on the container body 2 side). Protrusions 44f protruding radially inward are formed at two circumferentially opposite positions on the inner side of the enlarged diameter portion 44e (see FIGS. 4A, 4B, and 5). The protrusion 44f is configured to engage the riding portion 21 and the stopper portion 22 of the container body 2 . The relationship between this protrusion 44f, the riding part 21, and the stopper part 22 will be described later. A valve seat 44g that supports the check valve 45 is formed inside the inner cylindrical portion 44b.

The check valve 45 includes a valve body 45a and an elastic piece 45b. The check valve 45 is fixed in the inner cylindrical portion 44b of the main cover member 44 by the discharge member 46 being engaged with the annular portion 44c of the cover body 41. The check valve 45 is configured so that when the pressure inside the accommodating part 5 (inside the inner bag 14 ) rises, the valve body 45 a of the check valve 45 is pushed up from the valve seat 44 g of the main cover member 44 . In this manner, by squeezing the accommodating portion 5 of the container body 2, the contents in the accommodating portion 5 can be ejected from the ejection port 46a of the ejection member 46. When the extrusion 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 45a. With such a structure, the laminated peeling container 1 of this embodiment can prevent outside air from flowing into the inner bag 14 and suppress deterioration of the contents.

Hereinafter, the structure of attaching the cover 4 to the mouth part 6 will be described in further detail using FIGS. 5 to 6B.

When the cap 4 is attached to the mouth 6 of the container body 2, the external thread 6a of the mouth 6 and the internal thread 44d of the cap 4 are screwed together as described above. As shown in Figure 5, when moving cover 4 to the fastening direction After being rotated to the threaded end, the pair of opposing protrusions 44f of the cap 4 ride on the corresponding riding portion 21 of the mouth portion 6 and fit into the recessed portion 23 . Here, the riding portion 21 has the inclined portion 21 a that is gradually inclined toward the fastening direction side toward the radially outer side opposite to the fastening direction, so that the protrusion 44 f can be easily crossed. In addition, once the protrusion 44f is fitted into the recessed portion 23, the riding portion 21 functions to prevent loosening (anti-rotation), thereby preventing the cover 4 from loosening.

The mouth part 6 of this embodiment has the stopper part 22 on the fastening direction side of the thread of the riding part 21. This structure can prevent the cover 4 from exceeding the fastening position (overfastening) where the protrusion 44f and the recessed portion 23 are fitted. With such a structure, when the lid 4 is attached to the laminated peeling container 1 of the present embodiment, the end point of tightening can be easily grasped by the click feeling caused by riding on the protrusion 44f, and the engagement of the protrusion 44f with the stopper 22 can be achieved. Position cover 4 in the appropriate tightened position.

However, in the laminated peeling container 1 of this embodiment, since the container body 2 is separated into the outer shell 12 and the inner bag 14, and the thickness of each layer is thin, the strength of the stopper 22 and the like is limited. In addition, when the peelable containers 1 are laminated, it is necessary to make the peeled inner bag 14 thinner, so it is difficult to increase the thickness locally by parison control. Therefore, when the cap 4 is tightened, the stopper 22 may be crushed due to insufficient strength of the stopper 22 , causing the limit of the stopper 22 to be exceeded.

As shown in FIG. 6A , the radial protruding width T2 of the stopper portion 22 of the container body 2 of the present embodiment is set larger than the radial protruding width T1 of the riding portion 21 . The circumferential width W2 of the stopper portion 22 is set larger than the circumferential width W1 of the riding portion 21 . As shown in Figure 6B, only The height H2 of the moving part 22 is set larger than the height H1 of the riding part 21. With this configuration, the strength of the stopper 22 can be improved without increasing the thickness of the container body 2 .

The riding part 21 and the stopper part 22 are provided across both the mouth part 6 and the shoulder part 7 at the boundary of the mouth part 6 and the shoulder part 7. As long as the container body 2 of the present embodiment has such a structure, the riding portion 21 can be raised compared to the case where the riding portion 21 and the stopper 22 protrude only from the mouth portion 6 or only from the shoulder portion 7 . and the lightness of the stopper 22.

It should be noted that when the height H2 of the stopper 22 is increased, the cover 4 may be interfered by other protrusions 44f approximately half a turn before the tightening end point. However, in the present embodiment, the height H2 of the stopper 22 is set to a substantially maximum height that does not interfere with the other protrusions 44f, and the upper surface of the stopper 22 is formed into a tapered shape in which the height gradually decreases toward the fastening direction. Surface 22f (see FIG. 6B). In this manner, the strength of the stopper 22 can be maintained while preventing the installation operation of the cover 4 from being hindered. In this embodiment, the fastening direction side of the stopper 22 is configured as a tapered surface 22g whose height becomes lower in the fastening direction. In addition, since the height H1 of the riding part 21 is smaller than the height H2 of the stopper part 22, the protrusion 44f of the cover 4 can easily ride on the riding part 21.

In addition, the invention of the first aspect can be implemented in the following manner.

． In the above-described embodiment, the height H1 and the radial protrusion width T1 of the riding portion 21 may be increased based on the height H2 and the radial protrusion width T2 of the stopper portion 22 . However, it is also possible to configure only one of the height of the stopper portion 22 and the radial protrusion width T2 to be larger than that of the riding portion 21 . With such a configuration, the strength of the stopper 22 can also be improved. In addition, you can ride the part 21 and the height and protruding width of the stopper 22 do not change, but the circumferential width W2 of the stopper 22 is set larger than the circumferential width W1 of the riding part 21, which can also increase the height of the stopper. 22 intensity. By making at least one of the height, protrusion width, and circumferential width of the stopper portion 22 larger than that of the riding portion 21 , the strength of the stopper portion 22 can be increased.

． In the above-described embodiment, the protrusion 44f of the cover 4 is configured to protrude radially inward from the enlarged diameter portion 44e. However, the protrusion 44f may be configured to extend in the downward direction from the end of the outer cylindrical portion 44a of the cover 4.

． In the above-mentioned embodiment, although the riding portion 21 and the stopper portion 22 of the container body 2 are provided in pairs at opposite positions in the circumferential direction, only one riding portion 21 and one stopper portion 22 may be provided. In addition, you may provide three or more riding parts 21 and stopper parts 22.

． In the above-described embodiment, the example in which the lidded container is the stacked and peelable container 1 has been described. However, the lidded container may not be the stacked and peelable container 1 . Even in a container that is not normally peeled off, as long as the container body 2 is provided with the stopper 22 on the fastening direction side of the thread closer to the riding portion 21 , the cap 4 can be prevented from exceeding the limit.

(Embodiment of the second aspect)

1. First embodiment of the second aspect

Next, the leakage inspection method of the double container according to the first embodiment of the second aspect of the present invention will be described.

<Double Container 101>

First, the double container 101 targeted for leakage inspection will be described using FIGS. 7 , 10 and 11 . The double container 101 has an outer shell 112 and an inner bag 114, and the inner bag 114 shrinks as the content decreases, that is, the double container 101 is a stacked peeling container. By separating the inner bag 114 from the outer shell 112 as the content decreases, the inner bag 114 is separated and shrunk from the outer shell 112 . By using this container, external air is less likely to enter the inner bag 114, so deterioration of the contents can be suppressed.

The shell 112 is made of, for example, low-density polyethylene, linear low-density polyethylene, high-density polyethylene, polypropylene, ethylene-propylene copolymers, and mixtures thereof. Housing 112 may be constructed of multiple layers. The inner bag 114 is preferably composed of multiple layers. For example, an EVOH layer composed of ethylene-vinyl alcohol copolymer (EVOH) resin may be used in the layer in contact with the outer shell 112, and low-density polyethylene, linear low-density polyethylene, high-density polyethylene, or high-density polyethylene may be used in the layer in contact with the content. The inner surface layer is composed of polyolefins such as polyethylene, polypropylene, ethylene-propylene copolymers and their mixtures. In addition, it is preferable to use an adhesive layer between the EVOH layer and the inner surface layer.

The double container 101 has a bottomed cylindrical shape and is provided with a storage portion 107 for storing contents, and a mouth portion 109 for discharging the contents from the storage portion 107 . The accommodating part 107 includes a trunk part 107a and a bottom part 107b. The mouth 109 is provided with an engaging portion (external thread portion) 109d, so that 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 bite portion 107d formed by flattening the parison with a pair of split molds. The snap-off portion 107d is provided at the bottom 107b of the double container 101, and the bottom of the double container 101 is closed by welding two opposing surfaces of the parison at the snap-off portion 107d. Although the bite portion 107d blocks the bottoms of the outer shell 112 and the inner bag 114 respectively, since the bite portion 107d is particularly weak at the outer shell 112, when the outer shell 112 is When an impact is applied, the bite portion 107d of the housing 112 is opened to form the outside air introduction portion 115. The outside air introduction part 115 can introduce outside air between the outer shell 112 and the inner bag 114. When the outside air introduction part 115 is formed in the bite part 107d, the bottom part of the inner bag 114 becomes almost fixed to the bottom part 107b of the double 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 introduction part 115 may be formed by perforating the casing 112 . The outside air introduction part 115 may be provided in the accommodating part 107 or the mouth part 109.

<Leak check device 102>

The leakage inspection device 102 used for implementing the leakage inspection method of the double container 101 of this embodiment is demonstrated using FIGS. 8-10. The leakage inspection device 102 includes a head member 103, a solenoid valve 104, a pressure reducing system 105, a pressurizing system 106, and a pipe 108. The piping 108 includes a piping 108a connecting the head member 103 and the solenoid valve 104, a piping 108b connecting the pressure reducing system 105 and the solenoid valve 104, and a piping 108c connecting the pressurizing system 106 and the solenoid valve 104. By controlling the solenoid valve 104, the connection between the pressure reducing system 105 and the pressurizing system 106 and the head unit 103 can be switched. Air can be drawn through the head piece 103 using a pressure reducing system 105 and air can be drawn through the head piece 103 using a pressurizing system 106 .

The pressure reducing system 105 includes a flow meter 151, a pressure meter 152, a regulator 153, and a vacuum pump 154 in order from the solenoid valve 104 side. The vacuum pump 154 discharges the air in the pipe 108b to depressurize the inside of the pipe 108b. The regulator 153 controls the air flow rate flowing in the pipe 108b or the air pressure in the pipe 108b. The pressure gauge 152 measures and records the air pressure in the pipe 108b. The flow meter 151 measures and records the air flow rate flowing in the pipe 108b. The structure included in the pressure reduction system 105 The order of components can be changed or omitted as appropriate.

The pressurizing system 106 includes a speed controller 161, a regulator 162, and a compressor 163 in 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 the air flowing in the pipe 108c. It should be noted that the pressurizing system 106 can be omitted when it is not needed. In this case, the solenoid valve 104 can also be omitted.

The head unit 103 includes a head unit base 131 and a seal 132 . The head member base 131 and the seal 132 are respectively provided with through holes 131a and 132a that communicate with the inside of the pipe 108a. The seal 132 is arranged in the accommodation recess 131b of the head base 131. The sealing member 132 is made of a material that can improve air tightness, such as elastomer. According to this structure, as shown in FIG. 10 , when the head base 131 is pressed toward the end surface of the mouth 109 , the head base 131 and the end surface of the mouth 109 come into close contact through the seal 132 , thereby forming the inner bag 114 The inside of the bag is connected to the outside only through the through holes 131a and 132a, and the inner bag 114 can be decompressed or pressurized by the decompression system 105 or the pressurization system 106.

<Leak check method>

The leakage inspection method of the double container 101 of this embodiment is demonstrated. The method includes the step of determining whether the inner bag 114 has pinholes based on data obtained when the inner bag 114 is decompressed.

This step can be performed by connecting the head part 103 to the pressure reducing system 105, and connecting the head part 103 to the pressure reducing system 105. This is performed by operating the vacuum pump 154 in a state where the end surface of the mouth 109 is pressed. Thereby, as shown in FIG. 11 , the air inside the inner bag 114 is sucked out, the pressure inside the inner bag 114 is reduced, and the inner bag 114 contracts.

As shown in FIG. 12 , after the pressure reduction is started, the air flow rate measured by the flow meter 151 increases rapidly, 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 shrinks. On the other hand, when the inner bag 114 has pinholes, even if the inner bag 114 shrinks, air will flow into the inner bag 114 through the pinholes, so the air flow rate sucked out from the inner bag 114 is higher than that in the case where the inner bag 114 does not have pinholes. many. Therefore, after the predetermined time T has elapsed, based on the air flow rate sucked out from the inner bag 114 (more specifically, by checking whether the flow rate exceeds the threshold Th), it can be determined whether there is a pinhole in the inner bag 114.

When there are pinholes in the inner bag 114, the sealing degree inside the inner bag 114 becomes low, making it difficult for the pressure reduction in the inner bag 114 to increase. Therefore, with the set pressure of the vacuum pump 154 being the reference value, it can be determined whether there is a pinhole in the inner bag 114 based on the pressure detected by the pressure gauge 152 after a predetermined time has elapsed. In addition, in addition to flow rate and pressure, whether there is a pinhole can also be determined based on data such as the shrinkage state or shrinkage time of the inner bag 114 . However, from the viewpoint of accuracy, judgment based on flow rate is preferred.

It should be noted that when the inner bag 114 is in contact with the outer shell 112, even if there is a pinhole in the inner bag 114, it may be missed because the pinhole is blocked by the outer shell 112. However, in this embodiment In this method, pinhole inspection is performed while depressurizing the inside of the inner bag 114, so it is not easy to miss pinhole detection.

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

In the case of a highly transparent double container, it is possible to visually confirm whether the inner bag 114 has a pinhole, but it is difficult to visually confirm a colored double container. Therefore, the detection method according to this embodiment has significant technical significance in leakage inspection of colored double containers.

After the leakage check is completed, operate the solenoid valve 104 and connect the head unit 103 to the pressurizing system 106. By operating the compressor 163 in this state, air can be sent into the inner bag 114 to expand the inner bag 114. In this manner, the filling step of filling the bag 114 with the contents becomes easy.

2. Second embodiment of the second aspect

This embodiment is similar to the first embodiment, and the main difference lies in the structure of the head part 103 . Below, the differences will be mainly described.

As shown in FIG. 13 , in this 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 133a. The through hole 134a is provided in the seal 134, and the rod-shaped portion 133a is inserted into It passes through the through hole 134a. Seal 134 is made of the same material as seal 132 . The rod-shaped part 133a is a rod-shaped part.

As shown in FIG. 14 , the through hole 133 is provided in the insertion member 133 , and the rod-shaped portion 133 a is provided with a suction port 133 d inserted into the through hole 133 c. The suction port 133d is provided at the front end 133a1 of the rod-shaped part 133a. Since the front end 133a1 is not easily covered by the inner bag 114 after the inner bag 114 is shrunk, and the suction port 133 is provided at the front end 133a1, the suction port 133d is not easily blocked by the inner bag 114. Since the rod-shaped portion 133a is inserted into the inner bag 114, it is preferable that the side surfaces and front edges of the rod-shaped portion 133a are curved so that the rod-shaped portion 133a does not damage the inner bag 114.

According to the above structure, as shown in FIG. 14 , when the head base 131 is pressed toward the end surface of the mouth 109 , the head base 131 , the flange 133 b , and the end surface of the mouth 109 are connected through the seals 132 and 134 In close contact, the inside of the inner bag 114 is connected to the outside only through the through holes 131a, 132a, and 133c, so that the inside of the inner bag 114 can be decompressed or pressurized by the decompression system 105 or the pressurization system 106.

By using the leakage inspection method of this embodiment, it is possible to depressurize the inside of the inner bag 114 with the rod-shaped portion 133a inserted into the inner bag 114 from the mouth 109, thereby shrinking the inner bag 114 and confirming the inner bag. 114 Whether there are pinholes (as shown in Figure 15). According to this method, the following effects can be achieved.

． Suppresses uneven peeling of inner bag 114

As shown in FIG. 10 , the inner bag 114 has a pair of opposing portions 114 b and 114 c facing each other with the bite portion 107 d interposed therebetween. In the first embodiment, as shown in FIG. 16 , only the portion 114 b is peeled off and the other portion is peeled off. 114c is not peeled off, so uneven peeling and shrinkage of the inner bag 114 occur. When such shrinkage occurs in the inner bag 114, there is a problem that leakage inspection cannot be effectively performed at the portion 114c. In this embodiment, as shown in FIG. 15 , since the inside of the inner bag 114 is decompressed with the rod-shaped portion 133a inserted, even if peeling occurs first at the site 114b, the site 114b will When it comes into contact with the rod-shaped portion 133a, the peeling of the portion 114b is stopped, and then the peeling of the portion 114c is performed. Therefore, according to this embodiment, it is possible to suppress uneven peeling of the inner bag 114 and effectively perform leakage inspection.

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

In the first embodiment, if the inner bag 114 further shrinks with the inner surfaces of the parts 114b and 114c in contact with each other, an upward force will be exerted on the bottom 114a of the inner bag 114, which may cause a problem as shown in the figure. As shown in 16, the bottom 114a is separated from the bottom 107b of the double container 101 and floats. On the other hand, in the present embodiment, as shown in FIG. 15 , the rod-shaped portion 133a is disposed between the portions 114b and 114c. Therefore, the portions 114b and 114c are not in direct contact, and it is possible to suppress the impact on the bottom 114a of the inner bag 114. As a result, the upward force can suppress the phenomenon that the bottom 114a is separated from the bottom 107b of the double container 101 and floats.

As shown in FIG. 14 , assuming that the total height of the double container 101 is H and the length of the portion where the rod-shaped portion 133 a is inserted into the inner bag 114 is L, L/H is preferably 0.40 or more. In this case, the above two effects can be effectively achieved. L/H is, for example, 0.40~0.99, specifically, 0.40, 0.50, 0.60, 0.70, 0.80, 0.90, 0.95, 0.99, or a range between any two of the numerical values illustrated here.

As shown in FIG. 14 , assuming that the diameter of the inscribed circle of the inner circumferential surface of the mouth portion 109 is D1 and the diameter of the circumscribed circle of the rod-shaped portion 133 a is D2, D2/D1 is preferably 0.30 or more. In this case, the above two effects can be effectively achieved. 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 it may be a range between any two of the numerical values illustrated here.

In addition, 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 it may be as illustrated here. The range between any two values.

In this embodiment, an excellent effect is exerted as a leak detection method, but from the viewpoint of obtaining the above two effects, an excellent effect is also exerted as a pre-peeling method of the double container 101 . Therefore, this view is not necessary for leak checking.

This embodiment can also be implemented in the following manner.

． The suction port 133d may be provided at a location other than the front end of the rod-shaped portion 133a. When the suction inlet 133d is provided on the periphery of the rod-shaped part 133a, it is preferable to provide the inner bag 114 at a position where the suction inlet 133d is not easily blocked (for example, near the base of the rod-shaped part 133a). The number of suction ports 133d may be two or more.

． The through hole 133c may be provided in the flange part 133b. In this case, the seals 132 and 134 are provided with through holes communicating with the through holes 133c. According to such a structure, the pressure inside the inner bag 114 can be reduced through the through hole 133c of the flange part 133b. It should be noted that in this case, the through hole 133c may be provided in the rod-shaped portion 133a so that the pressure inside the inner bag 114 can be reduced through both the rod-shaped portion 133a and the flange portion 133b. This is because the rod-shaped portion 133a is not provided with the through-hole 133c, and the inside of the inner bag 114 is only depressurized from the flange portion 133b.

(Embodiment of the third aspect)

1. Overall composition

As shown in FIG. 18A , a stacked peeling container 201 according to an embodiment of the third aspect of the present invention includes a substantially bottomed cylindrical container body 203 and a pump 204 .

As shown in FIGS. 19 and 20 , the container body 203 has a bottomed cylindrical shape and is provided with an accommodating part 233 having a trunk part 231 and a bottom part 232 and a mouth part 234 for discharging contents from the accommodating part 233 . An external thread portion 234a is provided on the outer surface of the mouth portion 234. The container body 203 of this embodiment is provided with an inner bag 206 and an outer shell 207 in the accommodating part 233 and the mouth part 234. As the content decreases, the inner bag 206 separates from the outer shell 207, so that the inner bag 206 separates and shrinks from the outer shell 207.

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

The shell 207 is composed of, for example, low-density polyethylene, linear low-density polyethylene, high-density polyethylene, polypropylene, ethylene-propylene copolymers, and mixtures thereof.

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

2. The composition of bottom 232

Hereinafter, the structure of the bottom 232 of the container body 203 will be described in detail using FIGS. 22A to 23B. As shown in FIG. 22A, FIG. 22B, FIG. 18B, FIG. 19, etc., the central part of the bottom part 232 of this embodiment is equipped with the pinch part 232p. The pinch portion 232p is a strip-shaped structure, which will be described later, and is formed by flattening the lower end of the laminated parison P using the bite portions 221X and 221Y (see FIG. 24A ) of the split molds 202X and 202Y. The bottom part 232 has the dual structure of the inner bag 206 and the outer shell 207 as mentioned above, and is formed by fitting the inner bag bottom 260 shown in FIG. 23A and the outer shell bottom 270 shown in FIG. 23B.

As shown in FIGS. 22A and 23A , the inner bag bottom 260 has an inner bag protruding portion 261 protruding outward at the pinch portion 232 p. As shown in FIGS. 23A and 23B , the shell bottom 270 has a clamping portion 271 for clamping the inner bag protruding portion 261 at the pinching portion 232p. The outside air introduction hole 208 is provided between the inner bag protruding part 261 and the clamping part 271 (see FIG. 22A, FIG. 23B, and FIG. 18B). In addition, in this embodiment, the inner bag protrusion part 261 and the clamping part 271 do not protrude from the bottom part 232, but they may be comprised so that they may protrude from the bottom part 232. In addition, after the container body 203 is formed, the inner bag protruding portion 261 and the clamping portion 271 are in close contact with each other, and no external air introduction hole 208 is provided. However, the inner bag protruding part 261 and the clamping part 271 are easy to peel off, so when an impact force or a reversing force is applied to separate the inner bag protruding part 261 from the clamping part 271, the inner bag protruding part 261 and the clamping part can be separated. 271 are peeled off and the external air introduction hole 208 can be formed between them. Since the container body 203 has the external air introduction hole 208, as the content decreases, external air is introduced between the outer shell 207 and the inner bag 206, so that only the inner bag 206 can be shrunk.

In addition, as shown in FIGS. 22A and 22B , the container body 203 of this embodiment has a thickness accumulation portion 209 formed at the longitudinal end of the pinch portion 232 p, which serves as an engaging portion to engage the inner bag 206 and the outer shell 207 . . Specifically, as shown in FIGS. 22B and 23A , the inner bag 206 (inner bag bottom 260 ) is provided with a pair of convex portions 262 protruding radially outward in the thickness accumulation portion 209 . As shown in FIGS. 22B and 23B , the case 207 (case bottom 270 ) is provided with a pair of recessed portions 272 that engage with the convex portion 262 in the thickness accumulation portion 209 . In the container body 203 of this embodiment, the convex portion 262 of the inner bag 206 in the thickness storage portion 209 is engaged with the concave portion 272 of the outer shell 207. Therefore, even if the inner bag 206 shrinks as the content decreases, the bottom 232 is not easily separated from the inner bag 206. . It should be noted that in this embodiment The convex portion 262 and the concave portion 272 are integrally formed by blow molding to be described later, and the convex portion 262 and the concave portion 272 have shapes that closely fit together.

As shown in FIG. 22B , the convex portion 262 is formed such that the protrusion amount d1 in the longitudinal direction thereof is 0.15 times or more the length d2 in the longitudinal direction from the center X of the bottom 232 to the front end of the convex portion 262 . The ratio of d1/d2 is preferably 0.18 or more, more preferably 0.20 or more. The ratio of d1/d2 is, for example, 0.15 to 0.30, more preferably 0.20 to 0.25. Specifically, it may be, for example, 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 any of the numerical values illustrated here. The range between any 2. It should be noted that the "protrusion amount d1 in the longitudinal direction of the convex portion 262" means: in the cross section of the inner bag bottom 260 on the pinched portion 232p as shown in FIG. 22B, the most narrowed area from the inner bag bottom 260 The amount of protrusion from the neck position. The length of the protruding amount d1 is specifically formed to be 1.5 mm or more. The protruding amount d1 is preferably 2.0 mm or more. The protruding amount d1 is preferably 2.0 mm to 6.0 mm, more preferably 2.5 mm to 5.5 mm, further preferably 3.5 mm to 4.5 mm. Specific numerical values of the protruding 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, 4.74.8, 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 one of the numerical values illustrated here The range between any 2. In addition, the front end of the convex part 262 of this embodiment protrudes to substantially the same position in the radial direction as the edge of the bottom surface of the inner bag 206, as shown in FIG. 22A. However, it may also be configured to protrude outward from the edge of the bottom surface of the inner bag 206 . In addition, as long as the protruding amount d1 of the protruding portion 262 can be sufficiently ensured, the shape may be sufficient, and the tip of the protruding portion 262 may reach only a position inward of the edge of the bottom surface of the inner bag 206 .

3. Manufacturing method

Next, the manufacturing method of the laminated peeling container 201 as mentioned above, especially the blow molding step, is demonstrated using FIG. 24A-FIG. 26B.

As shown in FIGS. 24A and 24B , in this embodiment, the container body 203 is formed by blow molding the cylindrical laminated parison P extruded from the extruder 205 . The molten laminated parison P is extruded from the die head 205a (die head), and is closed-molded by a pair of divided dies 202X and 202Y of the blow molding die 202 . The divided molds 202X and 202Y have cavity shapes for forming various shapes of the container body 203 such as the trunk portion 231, the bottom portion 232, and the mouth portion 234 on the blow molded product.

As shown in FIG. 24A, the die diameter of the die 205a for extruding the laminated parison (that is, the diameter d3 of the laminated parison P extruded from the die 205a) refers to the inner diameter of the divided dies 202X and 202Y forming the bottom. The inner diameter of the portion is less than 2/π times the diameter d4 of the bottom 232 (bottom surface). Under such conditions, even if the laminated parison P is flattened from a cylindrical state by using a closed mold, the folded diameter (which is the width of the laminated parison P after being flattened) (which is the same as the pinched portion 232p after the molding) The width is basically the same) will become smaller than the inner diameter d4 of the portion forming the bottom 232 of the container body 203. As a result, inside the container, the flattened laminated parison P can flow radially outward during blow molding, and the thickness accumulation portion 209 can be easily formed. The ratio of d3/d4 is, for example, 0.1 to 0.63, and more preferably 0.19 to 0.42. The ratio of d3/d4 is specifically, 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 a range between any two of the numerical values illustrated here.

As shown in FIG. 24B , in this embodiment, the diameter d3 of the laminated parison P is set slightly smaller than the inner diameter d5 of the portion forming the mouth 234 of the container body 203 among the inner diameters of the blow molding mold 202 . The ratio of d3/d5 is, for example, 0.6 to 0.9, and more preferably 0.7 to 0.8. The ratio of d3/d5 is specifically 0.70, 0.71, 0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78, 0.79, 0.80, or may be a range between any two of the numerical values illustrated here. When the diameter d3 of the laminated parison P is too large relative to the inner diameter d5 of the portion forming the mouth 234, burrs may occur during mold closing. In addition, when the diameter d3 of the laminated parison P is too small, The blow molding ratio becomes too large and forming becomes difficult. However, by setting the ratio of d3/d5 to the above-mentioned numerical value, the mouth portion 234 can be appropriately formed.

Hereinafter, the shape of the vicinity of the bottom 232 of the container body 203 using the blow molding mold 202 will be described in detail. As shown in FIG. 24A , the split molds 202X and 202Y of the blow molding mold 202 are respectively provided with bite portions 221X and 221Y. As shown in FIGS. 24A to 25B , the blow molding mold 202 includes a compression portion 222 below the bite portions 221X and 221Y. The compression part 222 is formed by the divided molds 202X and 202Y, and is used to compress the laminated parison P when the mold is closed.

As shown in FIGS. 24B and 25B , in the present embodiment, the compression section 222 includes a first compression region 222 a formed near both ends of the bite sections 221X and 221Y in the longitudinal direction; The second compression area 222b is located between the compression areas 222a. The width d6 of the first compression region 222a when the mold is closed is narrower than the width d7 of the second compression region 222a when the mold is closed. The width d6 of the first compression region 222a when the mold is closed is preferably set to the thickness d8 of the laminated parison P (see FIG. 26A). Down. The width d6 of the first compression region 222a when the mold is closed is preferably 1 mm or less, and more preferably 0.2 mm or less. It is preferable that the width d6 has an interval such that the molds are not in complete contact with each other, and is preferably 0.01 mm or more, for example. The value of width d6 is 0.01mm~1.00mm, preferably 0.05mm~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, 0.20 mm, or it may be any of the numerical values illustrated here. The range between any 2. In addition, the width d7 of the second 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 10 mm or less, more preferably 8 mm or less. The numerical value of the width d7 is, for example, 1.0 mm to 6.0 mm, more preferably 2.0 mm to 5.0 mm, even more preferably 3.0 mm to 4.0 mm. Specifically, it can 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, 6.0 mm, or a range between any two of the numerical values illustrated here.

26A to 26C show a state in which the stacked parison P is hung down relative to the blow molding mold 202 configured as above, and the pair of divided molds 202X and 202Y are slowly closed. When the split molds 202X and 202Y are closed from the state before mold closing shown in Fig. 26A, the bite portions 221X and 221Y of the split molds 202X and 202Y press the cylindrical laminated parison P inwardly, as shown in Fig. 26B. The inner surface of the laminated parison P (the layer forming the inner bag 206) first comes into contact with each other. When the divided molds 202X and 202Y are further closed from this state, the bite 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 two parts by the bite parts 221X and 221Y, and the pinch part 232p is formed on the container side.

After the mold is closed as described above, a blow nozzle is inserted into the opening on the mouth 234 side of the container body 203, and air is introduced and discharged into the cavity of the divided mold in the state after the mold is closed. Subsequently, the split mold is opened, the blow molded product is taken out, and the lower burrs formed on the lower side of the pinch portion 232p are removed. Then, the molded article formed as described above is subjected to a known inner layer preliminary peeling step and a forming step of the outside air introduction hole 208 as described above, thereby completing the container body 203 . Finally, the pump 204 is installed on the mouth 234 of the container body 203, and the stacked and peelable container 201 of this embodiment is finally completed.

In addition, when the split molds 202X and 202Y shown in FIGS. 26B to 26C are closed, the laminated parison P is gradually compressed. At this time, in this embodiment, since the blow molding mold 202 has the compression part 222, the lower part (container outer side) of the bite parts 221X and 221Y of the laminated parison P can be compressed more than the upper part (container inner side). Therefore, the flattened laminated parison P becomes easy to flow toward the inside of the container where the space is wide (in the direction of the arrow in FIG. 26B ).

Furthermore, the compression section 222 of this embodiment includes a first compression region 222a and a second compression region 222b, and the width d6 of the first compression region 222a near both ends in the longitudinal direction of the bite portions 221X and 221Y is larger than The width d7 of the second compression region 222b is configured to be narrower. In this manner, the laminated parison P flattened by the compression section 222 can be suppressed from expanding in the transverse direction (the longitudinal direction of the bite portions 221X and 221Y, the left-right direction in FIG. 24B ). Therefore, the laminated parison P moves longitudinally and is pushed back into the cavity, making it easier for the laminated parison P to flow toward the inside of the container. In addition, blow molding is performed by blowing air while the laminated parison P is pushed back by the compression section 222. The thickness accumulation portion 209 can be formed appropriately so that the inner bag 206 can be bitten into the outer shell 207 . As a result, the protruding amount d1 of the convex portion 262 of the inner bag 206 can be increased, and the engagement with the recessed portion 272 of the outer shell 207 can be strengthened to suppress the inner bag 206 from being separated from the bottom 232 .

In addition, in the conventional manufacturing method, the laminated parison P is compressed by the compression part 222. However, in the conventional manufacturing method, since the width of the compression portion 222 is fixed, the protruding amount d1 of the convex portion 262 of the inner bag 206 cannot be sufficiently obtained. In this regard, using the manufacturing method of this embodiment, the compression portion 222 is composed of the first compression region 222a and the second compression region 222b as described above, so that the protrusion amount d1 can be increased. Therefore, the ratio d1/d2 of the protrusion amount d1 in the longitudinal direction of the convex portion 262 and the length d2 in the longitudinal direction from the center X of the bottom 232 to the front end of the convex portion 262 can also be increased as described above. (Refer to Figure 22B).

In the laminated peeling container 201 of this embodiment, as described above, the convex portion 262 of the inner bag 206 is engaged with the concave portion 272 of the outer shell 207 in the thickness accumulation portion 209, so that the inner bag 206 is difficult to detach from the bottom 232, but this does not mean that The inner bag 206 is a structure that cannot be completely detached. That is to say, only the convex portion 262 of the inner bag 206 is engaged with the concave portion 272 of the outer shell 207. When the remaining amount of the contents in the stacked peeling container 201 becomes smaller and the shrinkage amount of the inner bag 206 becomes larger, the inner bag 206 passes through the inner bag 206. By deforming, the engagement between the convex portion 262 and the concave portion 272 can be released. As a result, the inner bag 206 can become more freely deformable, and the contents collected by the suction of the pump 204 can be collected at the end of the tube 244, so that the final remaining contents can be discharged.

4.Modifications

In addition, the invention of the third aspect can also be implemented in the following manner.

． In the embodiment described above, as shown in FIGS. 25A and 25B , the pair of split molds 202X and 202Y of the blow molding mold 202 are in complete contact at the outer position of the first compression region 222a. However, the blow molding mold 202 of the present invention is not limited to this. That is, as shown in FIG. 27A , the first compression region 222a may be configured to be connected to the end of the mold. In addition, as shown in FIG. 27B , in the area outside the first compression area 222 a (that is, the position where the laminated parison P does not reach when the mold is closed), the gap between the pair of divided molds 202X and 202Y can be proportional to The width d6 of the first compression region 222a is large.

． In the above-mentioned embodiment, the stacked peeling container 201 is configured to discharge the contents by the pump 204, but it may be configured to discharge the contents by squeezing the container body 203.

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

2: Container body

4: cover

5: Containment Department

5a: Valve component mounting recess

5b: Air circulation slot

6: Mouth

6a: External thread part

7:Shoulder

21: Riding Department

22: Stopper

23: concave part

Claims (4)

A lidded container having a container body and a lid, wherein the lid is provided with an internal thread portion, the container body has an external thread portion at the mouth that is screwed with the internal thread portion, and the lid is provided with a protrusion. The protrusion is provided at a position closer to the container body side than the internal thread portion, the container body is provided with a riding portion and a stopper portion, and the riding portion engages with the protrusion to limit the lid. The stopper is located on the tightening direction side of the thread of the riding part to limit the cover from overshooting. The container body has an outer shell and an inner bag, and the inner bag shrinks as the content decreases. The housing is formed with a valve component mounting recess, an air inlet hole is formed in the valve component mounting recess, a valve component is mounted in the air inlet hole, and the riding portion and the stopper portion are arranged in a circumferential direction. The protrusions are provided at two positions opposite to each other in the circumferential direction at substantially the same position as the valve member mounting recessed portion or at positions opposite to each other in the circumferential direction, and the riding portion and the stopper portion are respectively provided at opposite positions in the circumferential direction. At 2 places, the upper surface of the stopper is made into a tapered surface whose height gradually decreases toward the tightening direction. The lidded container according to claim 1, wherein the height of the stopper is set to be greater than the height of the riding part, and/or the protruding width of the stopper in the radial direction is set It is larger than the protruding width of the riding portion in the radial direction. A lidded container according to claim 1 or 2, wherein, The height of the stop that limits overrun of one protrusion is the approximate maximum height that does not interfere with the other protrusion. The lidded container according to claim 3, wherein the stopper has a tapered surface on a fastening direction side of the thread in the circumferential direction to prevent interference with the other protrusion.

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