TW202030462A - Capped container, leakage examination method for double container, lamination release container, and manufacturing method therefor - Google Patents

Abstract

Provided is a capped container capable of preventing an overrun of a cap. The present invention provides a capped container comprising a container body and a cap. The cap includes a female screw part. The container body includes a male screw part that threadedly engages the female screw part at a mouth part thereof. The cap includes a protrusion at a position thereof closer to a side of the container body than the female screw part. The container body includes a running-on part that engages the protrusion to restrict looseness of the cap, and a stopper part that is positioned closer to a side of a screw fastening direction than the running-on part and restricts an overrun of the cap.

Description

Leak inspection method of covered container and double container, layered peeling Separation container and its manufacturing method

The present invention relates to a container with a lid, a leakage inspection method of a double container, a laminated peeling container and a manufacturing method thereof.

(1st viewpoint)

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

(2nd viewpoint)

Patent Document 2 detects whether the inner bag has holes based on whether the pressure in the inner bag reaches a predetermined value after a predetermined time has passed after air is supplied to the inner bag.

(3rd viewpoint)

There is known a laminated peeling container that has an outer shell and an inner bag, and the inner bag shrinks as the contents decrease (for example, Patent Document 3). Such laminated and peelable containers are generally manufactured by blow molding using cylindrical laminated parisons.

[Prior Art]

【Patent Documents】

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 viewpoint)

In the structure of the aforementioned patent document 1, when the protrusion of the cover exceeds the riding portion, in principle, the cover can be further tightened, and there are still cases of over tightening (overrun, overrun).

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

(2nd viewpoint)

In the method of Patent Document 2, when air is supplied to the inner bag and the inner bag is accidentally expanded, it is judged that the inner bag has a hole regardless of whether there is a hole in the inner bag. Therefore, it is desirable to use other leak detection methods.

The present invention has been completed in view of the above circumstances, and provides a leak inspection method capable of detecting whether there are pinholes on the inner bag of a double container.

(3rd viewpoint)

Although a pinch part (seal part) for welding one end of the laminated parison is provided at the bottom of the laminated peeling container as shown in Patent Document 3, the inner bag may be detached from the bottom at the pinch part. If the inner bag is detached from the bottom with the contents remaining in the inner bag, the way in which the inner bag shrinks cannot be restricted, which may cause blockage of the flow path and even the hidden danger of pinholes. In the laminated peeling container of Patent Document 3, the welded layer at the pinch-off portion is welded by engaging a plurality of nip portions with each other. However, 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 part cannot be provided with an external air introduction part that introduces external air between the outer shell and the inner bag.

The present invention has been completed in view of the above-mentioned circumstances, and provides a laminated peeling container that restricts the occurrence of inner bag detachment from the bottom.

(1st viewpoint)

According to the present invention, there is provided a container with a lid having a container body and a lid, the lid having an inner screw The container body has a male threaded part screwed with the female threaded part at the mouth part, the cap is provided with a protrusion at a position closer to the container body than the female threaded part, and the container body has A riding portion and a stopper, the riding portion is engaged with the protrusion to restrict the loosening of the cover, and the stopper is located on the side of the tightening direction of the thread of the riding portion to restrict the cover from exceeding the limit .

According to the present invention, since the container body is provided with the stopper portion on the side closer to the tightening direction than the saddle portion, it is possible to prevent the cap from exceeding the limit.

Preferably, the height of the stopper portion is set to be greater than the height of the saddle portion, and/or the protrusion width of the stopper portion in the radial direction is set to be greater than the protrusion width of the saddle portion in the radial direction. The width is large.

Preferably, the protrusions are provided at two opposite locations in the circumferential direction, and the riding portion and the stop portion are provided at two opposite locations in the circumferential direction, respectively.

It is preferable that the height of the stop portion restricting the overrun of one protrusion is substantially the maximum height that does not interfere with the other protrusion.

It is preferable that the stopper portion has a tapered surface that prevents interference with the other protrusion on the tightening 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 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 approximately 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 viewpoint)

According to the present invention, there is provided a leakage inspection method of a double container configured to have an outer shell and an inner bag, and the inner bag shrinks as the content decreases, and the method includes a method based on the internal pressure reduction of the inner bag. The obtained data is used to determine whether the inner bag has pinholes.

The data such as the flow rate of air sucked from the inside of the inner bag or the pressure of the reduced pressure when the inside of the inner bag is depressurized vary according to whether there are pinholes in the inner bag. Based on this difference, it can be determined whether there are pinholes in the inner bag.

Hereinafter, various aspects of the present invention are illustrated. The embodiments shown below can be combined with each other.

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

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

Preferably, a pre-peeling method of 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, and the method includes the step of moving from the mouth of the double container to the inner A peeling step of peeling the inner bag from the outer shell by depressurizing the inside of the inner bag with the rod-shaped portion inserted in the bag.

Preferably, in the 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, wherein the diameter of the inscribed circle of the inner peripheral surface of the mouth portion is D1, the diameter of the circumscribed circle of the rod-shaped portion 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 portion.

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

(3rd viewpoint)

According to the present invention, there is provided a laminated peelable container having an outer shell and an inner bag, and the inner bag shrinks as the content decreases. The laminated peelable container includes a storage portion for containing the content, and a clip formed on the bottom of the storage portion. The cut-off portion is provided with an engaging portion for engaging the outer shell and the inner bag at an end portion of the clip-off portion in the longitudinal direction, and the inner bag is provided with an engaging portion facing the longitudinal direction at the engaging portion The convex part protruding outside,

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

According to the present invention, by providing the engaging portion at the end in the longitudinal direction of the pinch-off portion, the convex portion of the inner bag engages with the concave portion of the outer shell at the engaging portion, and the inner bag can be restricted from being detached.

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

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

Preferably, the pinch-off portion is provided with an external air introduction hole that introduces external air into the space between the outer shell and the inner bag.

In addition, 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 the inner bag shrinks as the content decreases, including a blow molding step using a cylindrical laminated parison, the mold In the vicinity of the bitten portion forming the pinch-off portion of the laminated peeling container, there is provided a compression portion that compresses the laminated parison before mold closing to flow the laminated parison toward the inside of the container, the The compression portion includes a first compression region formed at positions near both ends in the longitudinal direction of the bite portion, and a second compression region formed at positions between the first compression regions, the The width of the first compression zone when the mold is closed is narrower than the width of the second compression zone when the mold is closed.

Preferably, the diameter of the die for extruding the laminated parison is 2/π times or less of the inner diameter of the part forming the bottom of the inner diameter of the die.

Preferably, the width of the first compression zone when the mold is closed is less than or equal to the thickness of the laminated parison, and the width of the second compression zone when the mold is closed is two times or less the thickness of the laminated parison.

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

(1st viewpoint)

1:Laminated peeling container

2: container body

3: Valve parts

4: cover

5: Containment Department

5a: Valve component installation recess

5b: Air circulation slot

6: Mouth

6a: External thread

7: Shoulder

8: Air inlet

12: Shell

14: inner bag

21: Riding Department

21a: Inclined part

22: Stop

22f: tapered surface

22g: tapered surface

23: recess

34: Seal

41: Lid body

42: hinge

43: cover

44: main cover part

44a: Outer cylinder

44b: inner tube

44c: Ring part

44d: Internal thread

44e: Enlarging part

44f: protrusion

44g: valve seat

45: check valve

45a: valve body

45b: elastic sheet

46: spit out parts

46a: spit out

G: Space

H1: height

H2: height

T1: Protruding width

T2: Protruding width

W1: width

W2: width

(2nd viewpoint)

101: Double container

102: Leak inspection device

103: Head part

104: Solenoid valve

105: Decompression 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: Location

114c: location

115: Outside air introduction part

131: Head part base

131a: Through hole

131b: Containment recess

132: Seal

132a: Through hole

133: Insert parts

133a: Rod

133a1: front end

133b: Flange

133c: Through hole

133d: suction port

134: Seal

134a: Through hole

151: Flowmeter

152: Pressure gauge

153: Regulator

154: Vacuum pump

161: Speed Controller

162: regulator

163: Compressor

(3rd viewpoint)

201: Laminated peeling container

202: Mold 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 inlet

209: Thickness accumulation part

221X: Bite part

221Y: Bite part

222: Compression Department

222a: The first compression zone

222b: 2nd compression zone

231: Torso

232: bottom

232p: pinch off

233: Containment Department

234: mouth

234a: outer twisted part

241: Body

241a: Tube

241b: Cylinder

242: Piston

243: Nozzle

244: tube

260: bottom of inner bag

261: Inner bag protrusion

262: Convex

270: bottom of the shell

271: Clamping part

272: Concave

P: laminated parison

R: area

X: Center

d1: protrusion amount

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

d3: Diameter of laminated parison P

d4: the diameter of the bottom

d5: The inner diameter of the part forming the mouth

d6: the width of the first compression zone

d7: the width of the second compression zone

d8: thickness of laminated parison P

Fig. 1 is a front perspective view of a container body 2 of a delaminating container 1 according to an 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 main components showing a state in which the cover 4 is attached to the container body 2 in Fig. 1.

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

Fig. 5 is a cross-sectional view taken along the line A-A in Fig. 3.

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

FIG. 7 is a perspective view of the double container 101 that is the target of the leak inspection in the second aspect of the present invention.

FIG. 8 is a block diagram of the leak 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.

10 is a cross-sectional view showing a state where the head member 103 in FIG. 9 is abutted on 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 pressure in the inner bag 114 is reduced from the state in FIG. 10 to shrink the inner bag 114.

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

FIG. 13 is an exploded perspective view showing the configuration of the head member 103 of the leak inspection device 102 according to the second embodiment of the second aspect of the present invention.

14 is a diagram showing the end of the mouth 109 of the double container 101 that the head member 103 of FIG. 13 abuts against A cross-sectional view of the state behind the face.

15 is a cross-sectional view showing a state where the pressure in the inner bag 114 is reduced from the state of FIG. 14 to shrink the inner bag 114.

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

FIG. 17 is a cross-sectional view showing a state where the bottom portion 114a of the inner bag 114 floats after the pressure of the inside of the inner bag 114 is further reduced from the state of FIG. 11.

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

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

20 is a cross-sectional view obtained by cutting the container body 203 with a cross section perpendicular to the cross section of FIG. 19.

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

FIG. 22A is an enlarged view showing the bottom portion 232 in the cross-sectional view of FIG. 19, and FIG. 22B is an enlarged view showing the bottom portion 232 in the cross-sectional view of 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 case when viewed from the inside.

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

Fig. 25A is a sectional view taken along line A-A in Figs. 24A and 24B, and Fig. 25B is an enlarged view of region R in Fig. 25A.

Figure 26A ~ Figure 26C show the gradually closing a pair of split molds 202X, 202Y, closed mold stack type An explanatory diagram of the state of the blank P.

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

Hereinafter, embodiments of the present invention will be described. The various technical features shown in the embodiments shown below can be combined with each other. In addition, each characteristic matter can independently establish the present invention.

(Embodiment of the first viewpoint)

The laminated peeling container 1 as a container with a lid according to the embodiment in the first aspect of the present invention includes: a container body 2 having a substantially bottomed cylindrical shape as shown in FIGS. 1 to 3; and a valve as shown in FIG. 3 Part 3; and threaded cover 4.

As shown in FIG. 1, the container main 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 portion 6 is smaller than the diameter of the receiving portion 5, and the receiving portion 5 and the mouth portion 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 receiving portion 5, the mouth portion 6 and the shoulder portion 7, and the inner bag 14 separates and shrinks from the outer shell 12 as the content decreases. On the side surface of the accommodating portion 5, an air introduction hole 8 is provided only in the housing 12 thereof. In addition, a male screw portion 6a 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 the present embodiment includes a riding portion 21 and a stopper portion 22 at the boundary portion between the mouth portion 6 and the shoulder portion 7. The stopper portion 22 is provided on the side in the tightening direction of the thread of the male thread portion 6a (the clockwise direction in FIGS. 1 and 2) from the saddle portion 21. The riding portion 21 restricts the cover 4 from loosening by engaging with the protrusion 44f of the cover 4 to be described later. The stopper 22 restricts the movement of the protrusion 44f and restricts the cover 4 from exceeding. A recessed portion 23 is formed at a position between the riding portion 21 and the stopper portion 22, and when the cover 4 is screwed onto the mouth portion 6, the protrusion 44f is positioned in the recessed portion 23. In this embodiment, as shown in FIG. 2, the saddle 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 used to adjust the space G between the outer casing 12 and the inner bag 14 and the inflow and out of air between the outside. As the structure of the valve member 3, for example, the gap between the edge of the air introduction hole 8 and the valve member 3 can be opened or closed by moving the valve member 3, so that the valve member 3 opens or closes the air introduction hole 8 (see FIG. 3 ); or the valve member 3 itself is provided with a valve capable of opening or closing the through hole, and the through hole is opened or closed by the action of the valve to open or close the air introduction hole 8. In addition, the valve member 3 may not be provided, and a film may be attached to the air introduction hole 8 to adjust the air inflow or out; or the configuration may be adjusted simply by closing the air introduction hole 8 with a finger or the like when the contents are discharged. . The valve member 3 may have any of the above configurations, or it may be configured to block the air introduction hole 8 when the shell 12 is compressed to make the inner bag 14 into a compressible state. When the compression force on the shell 12 is released, the outside air is Lead into space G.

After the valve member 3 is installed, the housing part 5 is shrunk. At this time, a valve member mounting recess 5a is formed in the receiving portion 5 so that the valve member 3 does not interfere with the shrink film. In addition, 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 addition, in this embodiment, the valve member attachment recessed part 5a and the air circulation groove 5b are provided in a pair of saddle part 21 and the stop part 22 in the circumferential direction substantially the same position or the position which opposes in the circumferential direction. With this positional relationship, in the vicinity of the riding portion 21 and the stopper 22, when the valve member 3 is installed, the inner bag 14 near the air introduction hole 8 is pre-peeled from the outer casing 12, and the inner bag 14 and the outer casing 12 become different. It is easy to be in close contact, and the inner bag 14 becomes easy to peel off when the contents are discharged.

In addition, through this positional relationship, when the container body 2 of this 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 inserted into the riding portion 21 and the stop portion 22. Together they are formed at a position that is 90 degrees off the parting line. In this way, it is possible not to generate an undercut in the process of forming the valve member attachment recess 5a, the air circulation 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 43 connected to the cover body 41 by 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 The shape portion 44c is formed. On the inner peripheral surface of the outer cylindrical portion 44a, a female screw portion 44d screwed with the male screw portion 6a of the mouth portion 6 of the container body 2 is formed. In addition, as shown in FIGS. 3, 4A, and 4B, an enlarged diameter portion 44e having a larger diameter is formed at an end portion (container body 2 side) below the female screw portion 44d of the outer cylindrical portion 44a. On the inner side of the enlarged diameter portion 44e and at two positions facing each other in the circumferential direction, protrusions 44f protruding radially inward are formed (see FIGS. 4A, 4B, and 5). The protrusion 44f is configured to engage with the riding portion 21 and the stopper portion 22 of the container body 2. The relationship between the protrusion 44f and the riding portion 21 and the stopper portion 22 will be described later. A valve seat 44g supporting 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 44 b of the main cover member 44 by the discharge member 46 being engaged with the annular portion 44 c of the cover body 41. The check valve 45 is configured such that when the pressure in the housing portion 5 (in 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 way, the accommodating portion 5 of the squeeze container main body 2 can discharge the contents in the accommodating portion 5 from the discharge port 46 a of the discharge member 46. When the squeezing is stopped, the check valve 45 is closed by the force of the elastic piece 45b of the check valve 45 supporting the valve body 45a. With such a configuration, the delaminating container 1 of the present embodiment can prevent external air from flowing into the inner bag 14 to suppress deterioration of the contents.

Hereinafter, the structure of attaching the cover 4 to the mouth portion 6 will be described in further detail using FIGS. 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 and the female screw portion 44d of the cover 4 are screwed together as described above. As shown in Figure 5, when the cover 4 to the tightening direction After rotating to the threaded end, the pair of opposed protrusions 44 f of the cover 4 ride on the riding portion 21 of the corresponding mouth 6 and fit into the recess 23. Here, the riding portion 21 has an inclined portion 21a that is gradually inclined toward the side in the tightening direction toward the radially outer side on the side opposite to the tightening direction, so that the protrusion 44f can be easily passed over. In addition, once the protrusion 44f is fitted into the recessed portion 23, the riding portion 21 functions to prevent looseness (anti-rotation), so that the cover 4 can be prevented from loosening.

The mouth portion 6 of the present embodiment has a stopper portion 22 on the fastening direction side of the thread of the saddle portion 21. With this structure, it is possible to suppress the cover 4 from exceeding the predetermined tightening position (over tightening) where the protrusion 44f is fitted into the recess 23. With such a configuration, the peelable laminate container 1 of the present embodiment makes it easy to grasp the end of the tightening by the click feeling caused by the riding of the protrusion 44f when the lid 4 is installed, and the protrusion 44f engages with the stopper 22 to enable Position the cover 4 in the proper fastening position.

However, in the laminated peeling container 1 of the present embodiment, since the container body 2 is separated at 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 has limitations. In addition, in the case of laminating the peelable containers 1, the inner bag 14 to be peeled needs to be formed thinner, so it is difficult to locally increase the thickness through parison control. Therefore, when the cap 4 is tightened, due to the insufficient strength of the stopper 22, the stopper 22 may be crushed, which may cause the limit of the stopper 22 to be exceeded.

As shown in FIG. 6A, the radial protrusion width T2 of the stopper portion 22 of the container body 2 of this embodiment is set to be larger than the radial protrusion width T1 of the saddle portion 21. The circumferential width W2 of the stopper 22 is set to be larger than the circumferential width W1 of the saddle 21. As shown in Figure 6B, The height H2 of the moving part 22 is set to be larger than the height H1 of the riding part 21. With such a configuration, the thickness of the container body 2 does not need to be increased, that is, the strength of the stopper 22 can be improved.

The riding portion 21 and the stop portion 22 are provided so as to straddle both the mouth portion 6 and the shoulder portion 7 at the boundary between the mouth portion 6 and the shoulder portion 7. As long as the container body 2 of the present embodiment has such a configuration, the riding portion 21 can be improved compared to the case where the riding portion 21 and the stopper portion 22 protrude only from the mouth portion 6 or only from the shoulder portion 7. And the lightness of the stop 22.

It should be noted that when the height H2 of the stopper 22 is increased, it may be disturbed by other protrusions 44f approximately half a circle before the end of the cap 4 is tightened. However, in this embodiment, the height H2 of the stopper portion 22 is set to be approximately the maximum height that does not interfere with other protrusions 44f, and the upper surface of the stopper portion 22 is made into a tapered shape whose height gradually decreases toward the tightening direction. Surface 22f (refer to FIG. 6B). In this way, the strength of the stopper 22 can be maintained, and the installation operation of the cover 4 can be prevented from being obstructed. In this embodiment, the tightening direction side of the stopper 22 is configured as a tapered surface 22g whose height decreases in the tightening direction. In addition, since the height H1 of the riding portion 21 is smaller than the height H2 of the stopper 22, the protrusion 44f of the cover 4 can easily ride on the riding portion 21.

In addition, the invention of the first viewpoint can be implemented as follows.

. In the above-described embodiment, the height H1 and the radial protrusion width T1 of the saddle portion 21 can be increased based on the height H2 of the stop portion 22 and the radial protrusion width T2. However, only one of the height of the stopper portion 22 and the protrusion width T2 in the radial direction may be configured to be larger than that of the saddle portion 21. In such a configuration, the strength of the stopper 22 can also be improved. In addition, the riding department The height and protruding width of 21 and the stop part 22 do not change, but the width W2 of the stop part 22 in the circumferential direction is set to be larger than the width W1 of the saddle part 21 in the circumferential direction, so that the stop part can also be increased The intensity of 22. By making at least one of the height, the protrusion width, and the width in the circumferential direction of the stopper portion 22 larger than the saddle portion 21, the strength of the stopper portion 22 can be improved.

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

. In the above-mentioned embodiment, although the saddle part 21 and the stop part 22 of the container body 2 are provided in a pair at positions facing each other in the circumferential direction, only one saddle part 21 and the stop part 22 may be provided respectively. In addition, it is also possible to provide three or more riding parts 21 and stoppers 22.

. In the above-mentioned embodiment, although an example in which the container with a lid is the peel-a-layer container 1 is described, the container with a lid may not be the container 1 with a layer-and-layer peel. Even in a container that does not normally peel off, as long as the container body 2 is provided with the stopper 22 on the side closer to the screw tightening direction than the saddle portion 21, the limit of the lid 4 can be prevented from being exceeded.

(Embodiment of the second viewpoint)

1. The first embodiment of the second viewpoint

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

<Double Container 101>

First, the double container 101 that is the object of the leak 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 laminated 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 does not easily enter the inner bag 114, and therefore, 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 copolymer, and mixtures thereof. The housing 112 may be composed 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 for the layer in contact with the shell 112, and low-density polyethylene, linear low-density polyethylene, and high-density polyethylene may be used for the layer in contact with the content. Polyolefin inner layer composed of polyethylene, polypropylene, ethylene-propylene copolymer and their mixtures. In addition, it is preferable to use an adhesive layer between the above-mentioned EVOH layer and the inner surface layer.

The double container 101 has a bottomed cylindrical shape, and includes a storage portion 107 for storing contents, and a mouth portion 109 for ejecting the contents from the storage portion 107. The accommodating portion 107 includes a trunk portion 107a and a bottom portion 107b. An engaging portion (external thread 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 bite portion 107d formed by squeezing a parison by a pair of divided molds. The bite portion 107d is provided on the bottom portion 107b of the double container 101, and the bottom of the double container 101 is closed by welding the two opposing surfaces of the parison at the bite portion 107d. Although the snap-off portion 107d blocks the bottoms of the outer shell 112 and the inner bag 114, respectively, the snap-off portion 107d at the outer shell 112 is extremely weak, so it should be used for the outer shell 112. When the 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 external air introduction 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 double container 101. Therefore, the bottom 114a of the inner bag 114 is easily separated from the bottom 107b of the double container 101 and floats. The external air introduction part 115 may be formed by perforating the housing 112. The external air introduction part 115 may be provided in the housing part 107 or the mouth part 109.

<Leak Inspection Device 102>

The leak inspection apparatus 102 used for implementing the leak inspection method of the double container 101 of this embodiment is demonstrated using FIGS. 8-10. The leak 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 pipe 108 includes a pipe 108 a connecting the head member 103 and the solenoid valve 104, a pipe 108 b connecting the pressure reducing system 105 and the solenoid valve 104, and a pipe 108 c connecting the pressurizing system 106 and the solenoid valve 104. By controlling the solenoid valve 104, it is possible to switch the connection between any one of the pressure reduction system 105 and the pressurization system 106 and the head member 103. The decompression system 105 can draw in air through the head part 103, and the pressurization system 106 can draw in air through the head part 103.

The pressure reducing system 105 includes a flow meter 151, a pressure gauge 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 reduce the pressure in the pipe 108b. The regulator 153 controls the air flow rate 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 flow rate of air flowing in the pipe 108b. The structure included in the decompression system 105 The order of the constituent elements may be appropriately changed or omitted.

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 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 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 communicating with the inside of the pipe 108a, respectively. The seal 132 is arranged in the receiving recess 131 b of the head member base 131. The sealing member 132 is made of a material that can improve air tightness, such as an elastomer. According to such a configuration, as shown in FIG. 10, when the head member base 131 is pressed against the end surface of the mouth portion 109, the head member base 131 and the end surface of the mouth portion 109 are brought into close contact by the seal 132, thereby forming the inner bag 114 The inside of the inner bag communicates with the outside only through the through holes 131a and 132a, and the inner bag of the inner bag 114 can be decompressed or pressurized by the decompression system 105 or the pressurization system 106.

<Leak inspection method>

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

This step can be achieved by connecting the head part 103 to the decompression system 105 and connecting the head part 103 In the state after pressing the end surface of the mouth 109, the vacuum pump 154 is operated for execution. As a result, 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 shrinks.

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 is no pinhole on the inner bag 114, the air flow 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 from the inner bag 114 is higher than that of the inner bag 114 without pinholes. many. Therefore, after the predetermined time T has elapsed, based on the air flow rate sucked from the inner bag 114 (more specifically, by checking whether the flow rate exceeds the threshold Th), it can be determined whether the inner bag 114 has pinholes.

When the inner bag 114 has pinholes, the degree of airtightness inside the inner bag 114 becomes low, so that the degree of pressure reduction in the inner bag 114 is not easily increased. Therefore, in a state where the set pressure of the vacuum pump 154 is the reference value, based on the pressure detected by the pressure gauge 152 after a predetermined time has elapsed, it can be determined whether the inner bag 114 has a pinhole. In addition to the flow rate and pressure, it is also possible to determine whether there are pinholes based on data such as the contraction state or contraction time of the inner bag 114. However, from the viewpoint of accuracy, judgment based on the flow rate is preferable.

It should be noted that when the inner bag 114 is in contact with the outer shell 112, even if the inner bag 114 has pinholes, the pinholes may be blocked by the outer shell 112, and the pinholes may be missed. However, in this embodiment In the method, the pinhole inspection is performed while reducing the pressure inside the inner bag 114, so it is not easy to cause the pinhole detection to be missed.

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

In the case of a double container with high transparency, 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, according to the detection method of the present embodiment, its technical significance is significant in the leak inspection of the colored double container.

After the leakage check is completed, the solenoid valve 104 is operated to connect the head part 103 to the pressurizing system 106. By operating the compressor 163 in this state, air can be sent into the inner bag 114, thereby expanding the inner bag 114. In this way, it is easy to perform the filling step of filling the bag 114 with the content.

2. The second embodiment of the second viewpoint

This embodiment is similar to the first embodiment, and the main difference lies in the structure of the head member 103. Hereinafter, the difference 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 that protrudes in the radial direction at the base end of the rod-shaped portion 133a. The through hole 134a is provided in the sealing member 134, and the rod-shaped portion 133a is inserted Pass through the through hole 134a. The material of the sealing member 134 is the same as that of the sealing member 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-shaped portion 133a is provided with a suction port 133d inserted through the through hole 133c. The suction port 133d is provided at the front end 133a1 of the rod-shaped portion 133a. Since the front end 133a1 of the inner bag 114 is not easily covered by the inner bag 114 after the inner bag 114 is contracted, 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 part 133a is inserted into the inner bag 114, it is preferable that the side and the front edge of the rod-shaped part 133a are curved so that the rod-shaped part 133a does not damage the inner bag 114.

According to the above configuration, as shown in FIG. 14, when the head member base 131 is pressed toward the end surface of the mouth portion 109, the end surfaces of the head member base 131, the flange portion 133b, and the mouth portion 109 are interposed by the seals 132, 134 In close contact, the inside of the inner bag 114 communicates with the outside only through the through holes 131 a, 132 a, and 133 c, so that the pressure reducing system 105 or the pressurizing system 106 can depressurize or pressurize the inside of the inner bag 114.

By using the leak inspection method of this embodiment, the pressure of the inside of the inner bag 114 can be reduced with the rod-shaped portion 133a inserted into the inner bag 114 from the mouth 109, and the inner bag 114 can be contracted to confirm the inner bag. 114 whether there is a pinhole (as shown in Figure 15). According to this method, the following effects can be achieved.

. Suppress uneven peeling of inner bag 114

As shown in FIG. 10, the inner bag 114 has a pair of opposing parts 114b and 114c across the bite portion 107d. In the first embodiment, as shown in FIG. 16, only the part 114b is peeled off. 114c does not peel off, and uneven peeling and shrinkage of the inner bag 114 occur. When such contraction of the inner bag 114 occurs, there is a problem that the leak check 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 while the rod-shaped portion 133a is inserted, even if peeling occurs first at the part 114b, the part 114b will When the rod-shaped portion 133a abuts, the peeling from the portion 114b is stopped, and then the peeling from the portion 114c is performed. Therefore, according to the present embodiment, uneven peeling of the inner bag 114 can be suppressed, and leakage inspection can be effectively performed.

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

In the first embodiment, if the inner bag 114 shrinks further in a state where the inner surfaces of the parts 114b and 114c are in contact with each other, an upward force is applied to the bottom 114a of the inner bag 114, which may cause problems as shown in the figure. 16 shows the phenomenon that the bottom 114a separates from the bottom 107b of the double container 101 and floats. On the other hand, in this embodiment, as shown in FIG. 15, the rod-shaped portion 133a is arranged between the parts 114b and 114c. Therefore, the parts 114b and 114c are not directly abutted, and it is possible to suppress the application to the bottom 114a of the inner bag 114. As a result of the upward force, the phenomenon that the bottom 114a separates and floats from the bottom 107b of the double container 101 can be suppressed.

As shown in FIG. 14, the total height of the double container 101 is H, and the length of the part where the rod-shaped portion 133a is inserted into the inner bag 114 is L, and 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, 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 two of the numerical values exemplified here.

As shown in FIG. 14, if the diameter of the inscribed circle of the inner peripheral surface of the mouth portion 109 is D1, and the diameter of the circumscribed circle of the rod-shaped portion 133a is D2, it is preferable that D2/D1 is 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 may be a range between any two of the numerical values exemplified here.

In addition, it is preferable that L/D2 is 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 exemplified here The range between any two of the values.

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

This embodiment can also be implemented as follows.

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

. The through hole 133c may be provided in the flange portion 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 of the inside of the inner bag 114 can be reduced through the through hole 133c of the flange portion 133b. It should be noted that in this case, the rod-shaped portion 133a may be provided with a through hole 133c so that the pressure in the inner bag 114 can be reduced through both the rod-shaped portion 133a and the flange portion 133b. In order not to provide a through hole 133c in the rod-shaped portion 133a, but only to reduce the pressure inside the inner bag 114 from the flange portion 133b.

(Embodiment of the third viewpoint)

1. Overall composition

As shown in FIG. 18A, the delaminating container 201 according to one embodiment of the third aspect of the present invention includes a container body 203 and a pump 204 that have a substantially bottomed cylindrical shape.

As shown in FIGS. 19 and 20, the container body 203 has a bottomed cylindrical shape, and includes a storage portion 233 having a trunk portion 231 and a bottom portion 232, and a mouth portion 234 through which contents are discharged from the storage portion 233. A male screw portion 234a is provided on the outer surface of the mouth portion 234. The container body 203 of the present embodiment is provided with an inner bag 206 and an outer shell 207 in the accommodating portion 233 and the mouth portion 234. As the content decreases, the inner bag 206 separates from the outer shell 207, thereby constituting the inner bag 206 to separate and shrink from the outer shell 207.

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

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

As shown in FIG. 21, the pump 204 is configured so that outside air is not introduced into the container body 203 but the contents can be discharged from the container body 203. The pump 204 includes a main body 241, a piston 242, a nozzle 243, and a tube 244. The main body portion 241 includes a cylindrical portion 241a and a cylinder portion 241b. A female screw part (not shown) screwed to the male screw part 234a of the mouth part 234 of the container body 203 is provided on the inner surface of the cylinder part 241a. The lower part of the cylinder 241b is inserted into the mouth 234. The outer diameter of the cylinder portion 241b is substantially the same as the inner diameter of the mouth portion 234. The cylinder part 241b is cylindrical, and the piston part 242 can slide in the cylinder part 241b. In the internal space of the cylinder 241b, the nozzle 243 and the pipe 244 communicate. A pump mechanism composed of an elastic member and a valve is contained in the internal space of the cylinder 241b. By sliding the piston 242 to operate the pump mechanism, the content sucked up via the tube 244 can be discharged from the nozzle 243.

2. The composition of the bottom 232

Hereinafter, the structure of the bottom portion 232 of the container body 203 will be specifically described using FIGS. 22A to 23B. As shown in FIG. 22A, FIG. 22B, FIG. 18B, FIG. 19, etc., the center part of the bottom part 232 of this embodiment is equipped with the pinch part 232p. The pinch-off portion 232p is a belt-shaped structure, which will be described later, and is formed by flattening the lower end of the laminated parison P using the pinch portions 221X, 221Y of the split molds 202X, 202Y (refer to FIG. 24A). The bottom 232 has the double structure of the inner bag 206 and the outer shell 207 as described above, and is constructed 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 protrusion 261 that protrudes outward at the pinch-off portion 232p. As shown in FIGS. 23A and 23B, the bottom part 270 of the housing has a clamping portion 271 for clamping the inner bag protrusion 261 at the clamping portion 232p. The external air introduction hole 208 is provided between the inner bag protrusion 261 and the clamping portion 271 (refer to FIGS. 22A, 23B, and 18B). It should be noted that, in this 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. In addition, after the container body 203 is molded, the inner bag protruding portion 261 and the clamping portion 271 are closely attached together, and no external air introduction hole 208 is provided. However, the inner bag protrusion 261 and the clamping portion 271 are easy to peel off, so when an impact force or a reverse force is applied to separate the inner bag protrusion 261 from the clamping portion 271, the inner bag protrusion 261 and the clamping portion can be separated. 271 peels off and can form outside air introduction holes 208 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 contracted.

In addition, as shown in FIGS. 22A and 22B, the container body 203 of the present embodiment has a thickness accumulating portion 209 formed at the longitudinal end of the pinch-off portion 232p, 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 that protrude radially outward at the thickness accumulation portion 209. As shown in FIGS. 22B and 23B, at the thickness accumulation portion 209, the housing 207 (the housing bottom 270) is provided with a pair of concave portions 272 that engage with the convex portion 262. In the container body 203 of this embodiment, the convex portion 262 of the inner bag 206 of the thickness accumulation portion 209 is engaged with the concave portion 272 of the outer shell 207, so even if the inner bag 206 shrinks as the content decreases, the bottom 232 is not easily detached from the inner bag 206 . It should be noted that the 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 a tightly fitting shape.

As shown in FIG. 22B, the protrusion 262 is formed such that the protrusion amount d1 in the longitudinal direction thereof is 0.15 times or more of the length d2 in the longitudinal direction from the center X of the bottom 232 to the tip of the protrusion 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, and more preferably 0.20 to 0.25. Specifically, it can 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 among the numerical values exemplified here The range between any two. It should be noted that the "protrusion amount d1 in the longitudinal direction of the convex portion 262" refers to the cross section of the inner bag bottom 260 on the pinch-off portion 232p as shown in FIG. The amount of protrusion from the neck position. The length of the protrusion d1 is specifically formed to be 1.5 mm or more. The amount of protrusion d1 is preferably 2.0 mm or more. The amount of protrusion d1 is preferably 2.0 mm to 6.0 mm, more preferably 2.5 mm to 5.5 mm, and still more preferably 3.5 mm to 4.5 mm. The specific numerical value of the protrusion amount d1 is, 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 the numerical values exemplified here The range between any two. It should be noted that the front end of the convex portion 262 of the present embodiment, as shown in FIG. 22A, protrudes to approximately the same position in the radial direction as the edge of the bottom surface of the inner bag 206. However, it may be configured to protrude more outward than the edge of the bottom surface of the inner bag 206. In addition, as long as it is a shape that can sufficiently ensure the protrusion amount d1 of the convex portion 262, the tip of the convex portion 262 may only reach a position inside the edge of the bottom surface of the inner bag 206.

3. Manufacturing method

Next, the manufacturing method of the above-mentioned laminated peeling container 201, especially the blow molding process, is demonstrated using FIGS. 24A-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 laminated parison P in the molten state is extruded from the die 205a (die head), and is closed-molded by the pair of split dies 202X and 202Y of the blow molding die 202. The split molds 202X and 202Y have various shapes of cavities for forming 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) means that the bottom is formed in the inner diameters of the split dies 202X and 202Y The inner diameter of the part is 2/π times or less of 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 the closed mold, the folded diameter of the width of the laminated parison P after being flattened (and the pinch-off portion 232p after forming) Is substantially the same width) becomes smaller than the inner diameter d4 of the portion forming the bottom 232 of the container body 203. As a result, in the interior of the container, the squashed laminated parison P can flow outward in the radial direction 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 exemplified here.

As shown in FIG. 24B, in this embodiment, the diameter d3 of the laminated parison P is set to be slightly smaller than the inner diameter d5 of the part 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 exemplified here. When the diameter d3 of the laminated parison P is too large relative to the inner diameter d5 of the portion where the mouth portion 234 is formed, flashing may occur when the mold is closed. In addition, when the diameter d3 of the laminated parison P is too small, The blow molding ratio becomes too large and forming is difficult. However, by setting the ratio of d3/d5 to the above-mentioned value, the mouth 234 can be appropriately formed.

Hereinafter, the shape of the vicinity of the bottom 232 of the container body 203 formed by the blow molding die 202 will be described in detail. As shown in FIG. 24A, the split molds 202X and 202Y of the blow molding mold 202 are provided with biting portions 221X and 221Y, respectively. As shown in FIGS. 24A to 25B, the blow molding die 202 includes a compression part 222 below the biting parts 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 portion 222 includes: a first compression region 222a formed in the vicinity of both ends in the longitudinal direction of the snap-off portions 221X and 221Y; The second compressed area 222b at a position between the compressed areas 222a. The width d6 when the first compression region 222a is closed is narrower than the width d7 when the second compression region is closed. The width d6 of the first compressed region 222a when the mold is closed is preferably set to be the thickness d8 of the laminated parison P (see FIG. 26A). under. The width d6 of the first compressed 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 where the two molds do not completely abut, and for example, it is preferably 0.01 mm or more. The value of the width d6 is 0.01 mm to 1.00 mm, preferably 0.05 mm to 0.20 mm. Specifically, it can 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 can be among the numerical values exemplified here The range between any two. In addition, the width d7 of the second compressed 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, and more preferably 8 mm or less. The value of the width d7 is, for example, 1.0 mm to 6.0 mm, more preferably 2.0 mm to 5.0 mm, and still 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 may be a range between any two of the numerical values exemplified here.

FIGS. 26A to 26C show a state where the laminated parison P is suspended from 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 biting portions 221X and 221Y of the split molds 202X and 202Y press the cylindrical laminated parison P inward, as shown in FIG. 26B, The inner surface (layer forming the inner bag 206) of the laminated parison P first abuts against each other. When the split molds 202X and 202Y are further closed from this state, the biting parts 221X and 221Y and the compression part 222 compress the laminated parison P. Then, the mold shown in FIG. 26C is completely closed, so that the laminated parison P is separated into two parts by the snap-off portions 221X and 221Y, and a pinch-off portion 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 side of the mouth 234 of the container body 203, and air is blown into and out of the cavity of the split mold in the state after the mold is closed. Subsequently, the split mold is opened to take out the blow molded product, and the lower flash formed on the lower part of the pinch-off portion 232p is removed. Then, the molded product formed as described above is subjected to the known pre-peeling step of the inner layer and the formation step of the external air introduction hole 208 described above, thereby completing the container body 203. Finally, by mounting the pump 204 on the mouth 234 of the container body 203, the laminated peeling container 201 of this embodiment is finally completed.

It should be noted that 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 the present embodiment, since the blow molding die 202 has the compression portion 222, the lower portion (container outer side) of the laminated parison P can be compressed more than the upper portion (container inner side) of the snap-off portions 221X and 221Y. Therefore, the flattened laminated parison P becomes easy to flow in the direction inside the container with a wide space (in the direction of the arrow in FIG. 26B).

Furthermore, the compression portion 222 of the present 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 greater than The width d7 of the second compressed region 222b is configured to be narrower. In this way, the laminated parison P crushed by the compressed portion 222 can be suppressed from spreading in the lateral direction (the longitudinal direction of the snap-off portions 221X and 221Y, the left-right direction in FIG. 24B). Therefore, the laminated parison P moves in the longitudinal direction and is pushed back into the cavity, so that the laminated parison P is more likely to flow toward the inside of the container. In addition, by blowing air in the state after the laminated parison P is pushed back by the compression part 222, the blow molding is performed, The thickness reservoir 209 can be formed appropriately, and the inner bag 206 can be bitten into the outer shell 207. As a result, the protrusion amount d1 of the convex portion 262 of the inner bag 206 can be increased, and the engagement with the concave portion 272 of the outer shell 207 can be enhanced, so that the inner bag 206 can be prevented from detaching 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 compressed portion 222 is fixed, the protrusion amount d1 of the convex portion 262 of the inner bag 206 cannot be sufficiently obtained. In this regard, using the manufacturing method of the present 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. Thereby, the ratio d1/d2 of the protrusion amount d1 in the longitudinal direction of the protrusion 262 to the length d2 in the longitudinal direction from the center X of the bottom 232 to the front end of the protrusion 262 can also be increased as described above. (Refer to Figure 22B).

In the delaminated container 201 of this embodiment, as described above, the convex portion 262 of the inner bag 206 in the thickness accumulation portion 209 is engaged with the concave portion 272 of the outer shell 207, 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. In other words, only the convex portion 262 of the inner bag 206 is engaged with the concave portion 272 of the outer shell 207. When the residual amount of the contents in the laminated peeling container 201 decreases, the shrinkage of the inner bag 206 increases, and the inner bag 206 passes through 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 be deformed more freely, and the contents sucked by the pump 204 are gathered at the end of the tube 244, so that the final remaining contents can be discharged.

4. Modifications

It should be noted that the invention of the third aspect can also be implemented as follows.

. In the above-mentioned embodiment, as shown in FIGS. 25A and 25B, the pair of split molds 202X and 202Y of the blow molding mold 202 have a structure that completely abuts on the outer side of the first compression region 222a. However, the mold 202 for blow molding of the present invention is not limited to this. That is, as shown in FIG. 27A, the first compression region 222a may be connected to the end of the mold. In addition, as shown in FIG. 27B, in a region more outside than the first compression region 222a (that is, a position where the laminated parison P does not reach when the mold is closed), the gap between the pair of split molds 202X and 202Y can be made more than The first compressed area 222a has a large width d6.

. In the above-mentioned embodiment, although the laminated peeling container 201 has a structure in which the contents are discharged by the pump 204, a structure in which the contents are discharged by squeezing the container body 203 may also be adopted.

. In the above embodiment, although the outside air introduction hole 208 is provided in the bottom portion 232, it may 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 installation recess

5b: Air circulation slot

6: Mouth

6a: External thread

7: Shoulder

21: Riding Department

22: Stop

23: recess

Claims (22)

A covered container with a container body and a lid, wherein The cap has an internal thread portion, and the container body has an external thread portion screwed to the internal thread portion at the mouth portion, The cap is provided with a protrusion provided at a position closer to the container body than the female screw portion, The container body includes a riding portion and a stopper, the riding portion engages with the protrusion to restrict looseness of the cap, and the stopper is located on the side of the tightening direction of the thread of the riding portion. The cover exceeds the limit. The container with a lid according to claim 1, wherein: The height of the stopper is set to be greater than the height of the saddle part, and/or the protrusion width of the stopper in the radial direction is set to be greater than the protrusion width of the saddle part in the radial direction Big. The container with a lid according to claim 1 or 2, wherein: The protrusions are arranged at two opposite positions in the circumferential direction, The riding portion and the stopping portion are respectively provided at two positions opposite to each other in the circumferential direction. The container with a lid according to claim 3, wherein: The height of the stop portion restricting the overrun of one protrusion is the approximate maximum height that does not interfere with the other protrusion. The container with a lid according to claim 4, wherein: The stopper has a tapered surface that prevents interference with the other protrusion on the tightening direction side of the thread in the circumferential direction. According to claim 1 or claim 2, the container with a lid, wherein: The container body has an outer shell and an inner bag, and the inner bag shrinks as the content decreases. The container with a lid according to claim 6, wherein: An air introduction hole is formed in the housing, The riding portion and the stopper portion are provided at approximately the same position in the circumferential direction as the air introduction hole or at positions opposite to each other in the circumferential direction. A leakage inspection method for a double container, 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 comprising: A step of judging whether the inner bag has pinholes based on the data obtained when the inner bag is decompressed. The method according to claim 8, wherein: The judgment is made based on the air flow rate sucked from the inner bag when the pressure is reduced. The method according to claim 8, wherein: The pressure reduction is performed in a state in which a rod-shaped portion is inserted into the inner bag from the mouth portion of the double container. A pre-peeling method for a double container, 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 comprising: Peeling step of peeling off the inner bag from the outer shell by depressurizing the inside of the inner bag with the rod-shaped portion inserted from the mouth of the double container into the inner bag . According to the method described in claim 10 or claim 11, wherein: Suppose the overall height of the double container is H, and the rod-shaped part inserted into the inner bag The length of the part is L, and L/H is 0.40 or more. According to the method described in claim 10 or claim 11, wherein: The diameter of the inscribed circle of the inner peripheral surface of the mouth portion is D1, the diameter of the circumscribed circle of the rod-shaped portion is D2, and D2/D1 is 0.30 or more. According to the method described in claim 10 or claim 11, wherein: The pressure reduction is performed through a suction port provided on the rod-shaped portion. The method according to claim 14, wherein: The suction port is provided at the front end of the rod-shaped portion. A laminated peeling container has an outer shell and an inner bag, and the inner bag shrinks as the content decreases, wherein, The laminated and peelable container includes a storage portion for containing contents, and a pinch-off portion formed at the bottom of the storage portion, An end portion in the longitudinal direction of the pinch-off portion is provided with an engaging portion for engaging the outer shell and the inner bag, The inner bag is provided with a convex portion protruding to the outside in the longitudinal direction at the engagement portion, The housing is provided with a concave portion that engages with the convex portion at the engaging portion, The protrusion amount of the convex portion in the longitudinal direction is 0.15 times or more of the length from the center of the bottom to the front end of the convex portion in the longitudinal direction. The laminated peeling container according to claim 16, wherein: 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 outward than the edge of the bottom surface of the inner bag. According to the laminated peeling container described in claim 16 or 17, wherein: The pinch-off portion is provided with an external air introduction hole that introduces external air into the space between the outer shell and the inner bag. A method for manufacturing a laminated peeling container, the laminated peeling container has an outer shell and an inner bag, and the inner bag shrinks as the content decreases, and the manufacturing method includes: Blow molding step using cylindrical laminated parison, Wherein, the mold is provided with a compression section that compresses the laminated parison before closing the mold to flow the laminated parison in the inner direction of the container in the vicinity of the bitten portion forming the pinch-off portion of the laminated peeling container, The compression portion includes: a first compression region formed at positions near both ends in the longitudinal direction of the bite-off portion; and a second compression region formed at positions between the first compression regions , The width of the first compression zone when the mold is closed is narrower than the width of the second compression zone when the mold is closed. The method for manufacturing a laminated peeling container according to claim 19, wherein: The diameter of the die for extruding the laminated parison is 2/π times or less of the inner diameter of the part forming the bottom of the inner diameter of the die. According to claim 19 or claim 20, the method for manufacturing a laminated peeling container, wherein: The width of the first compression zone when the mold is closed is less than or equal to the thickness of the laminated parison, The width of the second compression zone when the mold is closed is 2 times or less the thickness of the laminated parison. According to claim 19 or claim 20, the method for manufacturing a laminated peeling container, wherein: The width of the second compression zone when the mold is closed is 5 mm or less.

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