JP7137075B2 - delaminating container - Google Patents

Description

The present invention relates to delamination containers.

BACKGROUND ART Conventionally, there has been known a lamination-peelable container having an outer shell and an inner bag, in which the inner bag shrinks as the content decreases (for example, Patent Document 1). Such delaminated containers are generally manufactured by blow molding using a cylindrical laminated parison.

Patent No. 3401519

The bottom of such a delaminating container is provided with a pinch-off portion (seal portion) when one end of the laminated parison is welded, and the inner bag may be detached from the bottom at this pinch-off portion. If the inner bag is detached from the bottom while the contents remain in the inner bag, the shrinkage of the inner bag cannot be regulated, and the flow path may be blocked or pinholes may occur. There is In the delamination container of Patent Document 1, the welded layers in the pinch-off portion are adhered so as to mesh with each other by a plurality of biting portions. , leading to an increase in production costs. Moreover, in such a configuration, there is also a problem that the pinch-off portion cannot be provided with an outside air introducing portion for introducing outside air between the outer shell and the inner bag.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and provides a delaminating container in which detachment of the inner bag from the bottom is restricted.

According to the present invention, there is provided a lamination-peelable container having an outer shell and an inner bag, wherein the inner bag shrinks as the contents decrease, wherein the container contains the contents, and the bottom of the container An engaging portion for engaging the outer shell and the inner bag is provided at the longitudinal end of the pinch-off portion, and the inner bag is A projection projecting outward in the longitudinal direction is provided, and the outer shell is provided with a recess that engages with the projection in the engaging portion, and the amount of protrusion of the projection in the longitudinal direction is equal to the bottom portion. is 0.15 times or more of the length in the longitudinal direction from the center of the projection to the tip of the projection.

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

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

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

Preferably, the pinch-off portion is provided with an outside air introduction hole for introducing outside air into a space between the outer shell and the inner bag.

In addition, according to the present invention, there is provided a method for manufacturing a laminate peelable container having an outer shell and an inner bag, wherein the inner bag shrinks as the content decreases, the method comprising blowing using a cylindrical laminated parison. A molding step is provided, wherein the mold includes a compression part near a cutout part for molding the pinch-off part of the delaminated container, for compressing the laminated parison before mold clamping and causing the laminated parison to flow inward of the container. wherein the compression portion includes a first compression region formed near both ends in the longitudinal direction of the cutout portion, and a second compression region formed between the first compression regions, A method for manufacturing a delamination container is provided, wherein 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.

Preferably, the diameter of the die for extruding the laminated parison is not more than 2/π times the inner diameter of the portion forming the bottom of the inner diameter of the mold.

Preferably, the width of the first compression region when the mold is clamped is equal to or less than the thickness of the laminated parison, and the width of the second compression region when the mold is clamped is equal to or less than twice the thickness of the laminated parison. be.

Preferably, the second compression region has a width of 5 mm or less when the mold is closed.

FIG. 1A is a perspective view of a delaminating container 1 of one embodiment of the present invention, and FIG. 1B is a perspective view showing a bottom portion 32 of the delaminating container 1 of FIG. 1A. 1B is a cross-sectional view of the container body 3 of the delaminating container 1 of FIG. 1A. FIG. FIG. 3 is a cross-sectional view of the container body 3 taken along a cross section perpendicular to the cross section of FIG. 2 ; 1B is a front view of the pump 4 of the delamination container 1 of FIG. 1A; FIG. 5A is an enlarged view of the bottom portion 32 in the cross-sectional view of FIG. 2, and FIG. 5B is an enlarged view of the bottom portion 32 in the cross-sectional view of FIG. 6A is an enlarged perspective view of the bottom of the inner bag when viewed from the outside, and FIG. 6B is an enlarged perspective view of the bottom of the outer shell when viewed from the inside. FIG. 7A is a schematic end view of the blow molding die 2 used in the manufacturing process of the delaminating container 1 of FIG. 1 cut in a direction perpendicular to the split plane, and FIG. FIG. 4 is a schematic diagram of a 2Y division surface; 8A is a cross-sectional view taken along line AA in FIGS. 7A and 7B, and FIG. 8B is an enlarged view of region R in FIG. 8A. 9A to 9C are explanatory diagrams showing how the pair of split molds 2X and 2Y are gradually closed to clamp the laminated parison P. FIG. 10A shows Modification 1 of split molds 2X and 2Y shown in FIG. 8B, and FIG. 10B shows Modification 2 of split molds 2X and 2Y.

Embodiments of the present invention will be described below. Various features shown in the embodiments shown below can be combined with each other. In addition, the invention is established independently for each feature.

1. Overall Configuration A delamination container 1 according to an embodiment of the present invention includes a substantially cylindrical container body 3 with a bottom and a pump 4, as shown in FIG. 1A.

As shown in FIGS. 2 and 3, the container body 3 is in the shape of a cylinder with a bottom, and includes a housing portion 33 having a body portion 31 and a bottom portion 32, and a mouth portion 34 for discharging contents from the housing portion 33. . A male screw portion 34 a is provided on the outer surface of the mouth portion 34 . In addition, the container body 3 of the present embodiment includes the inner bag 6 and the outer shell 7 at the storage portion 33 and the mouth portion 34, and the inner bag 6 separates from the outer shell 7 as the contents decrease. , the inner bag 6 is configured to retract away from the outer shell 7 .

The inner bag 6 includes an EVOH layer provided on the container outer surface side, an inner 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. By providing the EVOH layer, the gas barrier properties and the peelability from the outer shell 7 can be improved. However, the adhesive layer may be omitted.

The outer shell 7 is made of, for example, low-density polyethylene, linear low-density polyethylene, high-density polyethylene, polypropylene, ethylene-propylene copolymer and mixtures thereof.

The pump 4, as shown in FIG. The pump 4 includes a body portion 41 , a piston portion 42 , a nozzle 43 and a tube 44 . The body portion 41 includes a cylindrical portion 41a and a cylinder portion 41b. The inner surface of the cylindrical portion 41a is provided with a female threaded portion (not shown) that is screwed into the male threaded portion 34a of the mouth portion 34 of the container body 3. As shown in FIG. The lower portion of the cylinder portion 41 b is inserted into the mouth portion 34 . The outer diameter of the cylinder portion 41b substantially matches the inner diameter of the mouth portion 34 . The cylinder portion 41b is cylindrical, and the piston portion 42 is slidable within the cylinder portion 41b. The internal space of the cylinder portion 41 b communicates with the nozzle 43 and the tube 44 . A pump mechanism composed of an elastic member and a valve is incorporated in the internal space of the cylinder portion 41b. By sliding the piston part 42 to operate the pump mechanism, the contents sucked up through the tube 44 can be discharged from the nozzle 43 .

2. Configuration of Bottom Portion 32 The configuration of the bottom portion 32 of the container body 3 will be specifically described below with reference to FIGS. 5A to 6B. The bottom portion 32 of this embodiment has a pinch-off portion 32p in its central portion, as also shown in FIGS. 5A, 5B, 1B, 2, and the like. The pinch-off portion 32p is a belt-like structure formed by pinching and crushing the lower end of the later-described laminated parison P between cut-off portions 21X and 21Y (see FIG. 7A) of the split molds 2X and 2Y. The bottom portion 32 has a double structure of the inner bag 6 and the outer shell 7 as described above, and is constructed by fitting the inner bag bottom portion 60 shown in FIG. 6A and the outer shell bottom portion 70 shown in FIG. 6B. be.

As shown in FIGS. 5A and 6A, the inner bag bottom portion 60 has an inner bag protruding portion 61 that protrudes outward at the pinch-off portion 32p. Further, as shown in 5A and FIG. 6B, the outer shell bottom portion 70 has a sandwiching portion 71 that sandwiches the inner bag projecting portion 61 at the pinch-off portion 32p. An outside air introduction hole 8 is provided between the inner bag projecting portion 61 and the clamping portion 71 (see FIGS. 5A, 6B and 1B). In this embodiment, the inner bag protruding portion 61 and the clamping portion 71 do not protrude from the bottom portion 32 , but may be configured to protrude from the bottom portion 32 . Immediately after the container body 3 is molded, the inner bag protruding portion 61 and the holding portion 71 are attached to each other, and the outside air introduction hole 8 is not provided. However, since the inner bag protruding portion 61 and the sandwiching portion 71 are easily separated, the inner bag protruding portion 61 and the sandwiching portion are separated by applying an impact or a twisting force so that the inner bag protruding portion 61 and the sandwiching portion 71 are separated. 71 can be peeled off to form the outside air introduction hole 8 therebetween. Since the container body 3 has the outside air introduction hole 8, it is possible to introduce the outside air between the outer shell 7 and the inner bag 6 as the contents decrease, and to contract only the inner bag 6. It's becoming

In addition, as shown in FIGS. 5A and 5B, etc., the container body 3 of the present embodiment has pinch-off portions 32p at longitudinal ends thereof, which serve as engagement portions for engagement between the inner bag 6 and the outer shell 7. A meat pool 9 is formed. Specifically, as shown in FIGS. 5B and 6A, in the meat pool 9, the inner bag 6 (inner bag bottom portion 60) has a pair of protrusions 62 protruding radially outward. In addition, in the meat pool 9, the outer shell 7 (shell bottom portion 70) is provided with a pair of concave portions 72 that engage with the convex portions 62, as shown in FIGS. 5B and 6B. In the container body 3 of the present embodiment, since the convex portion 62 of the inner bag 6 and the concave portion 72 of the outer shell 7 are engaged with each other in the meat pool 9, the inner bag 6 is displaced as the contents decrease. Even if it shrinks, the inner bag 6 will not easily come off from the bottom part 32. - 特許庁In addition, the convex portion 62 and the concave portion 72 of the present embodiment are integrally formed by blow molding, which will be described later, and the convex portion 62 and the concave portion 72 are shaped to be closely fitted to each other.

As shown in FIG. 5B, the convex portion 62 is formed so that the amount d1 of projection in the longitudinal direction is 0.15 times or more of the length d2 in the longitudinal direction from the center X of the bottom portion 32 to the tip of the convex portion 62. be. The d1/d2 ratio is preferably 0.18 or greater, more preferably 0.20 or greater. Also, the ratio of d1/d2 is, for example, 0.15 to 0.30, more preferably 0.20 to 0.25. Specifically, 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, and may be in the range between any two of the values exemplified herein. It should be noted that, as shown in FIG. 5B, the "protrusion amount d1 in the longitudinal direction of the convex portion 62" is defined as the amount of protrusion from the most constricted position of the inner bag bottom portion 60 in the cross section of the inner bag bottom portion 60 at the pinch-off portion 32p. be done. Specifically, the length of the protrusion amount d1 is formed to be 1.5 mm or more. The protrusion amount d1 is preferably 2.0 mm or more. Also, the protrusion amount d1 is preferably 2.0 mm to 6.0 mm, more preferably 2.5 mm to 5.5 mm, and even more preferably 3.5 mm to 4.5 mm. Further, specific values of the protrusion amount d1 are, for example, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2 .9, 3.0, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1 , 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 5.0, 5.1, 5.2, 5.3, 5 .4, 5.5, 5.6, 5.7, 5.8, 5.9, 6.0, and may be in the range between any two of the values exemplified herein. In addition, as shown in FIG. 5A, the tip of the convex portion 62 of the present embodiment protrudes to substantially the same position in the radial direction as the edge of the bottom surface of the inner bag 6 . However, it is also possible to adopt a configuration that protrudes outward from the edge of the bottom surface of the inner bag 6 . Further, the tip of the protrusion 62 may remain at a position inside the edge of the bottom surface of the inner bag 6 as long as the protrusion amount d1 of the protrusion 62 can be sufficiently secured.

3. Manufacturing Method Next, a manufacturing method of the delaminating container 1 described above, particularly a blow molding process, will be described with reference to FIGS. 7A to 9B.

In this embodiment, the container body 3 is formed by blow molding a cylindrical laminated parison P extruded from an extruder 5, as shown in FIGS. 7A and 7B. The laminated parison P is extruded from a die 5a (die head) in a molten state and clamped by a pair of split dies 2X and 2Y of the blow molding die 2. As shown in FIG. The split molds 2X and 2Y have a cavity shape such that various shapes of the container body 3, such as the body portion 31, the bottom portion 32, and the mouth portion 34, are formed into blow-molded products.

Here, as shown in FIG. 7A, the die diameter of the die 5a for extruding the laminated parison, that is, the diameter d3 of the laminated parison P extruded from the die 5a is the portion of the inner diameter of the split molds 2X and 2Y that forms the bottom. The inner diameter, that is, the diameter d4 of the bottom portion 32 (bottom surface) is set to 2/π times or less. Under these conditions, even if the laminated parison P is flattened from a cylindrical state by mold clamping, the folded diameter (the width of the pinch-off portion 32p after molding and the width of the pinch-off portion 32p after molding), which is the width of the crushed laminated parison P, ) is smaller than the inner diameter d4 of the portion forming the bottom portion 32 of the container body 3 . As a result, the crushed laminated parison P can also flow outward in the radial direction during blowing inside the container, so that the puddle 9 is likely to be formed. The d3/d4 ratio is, for example, 0.1 to 0.63, more preferably 0.19 to 0.42. Specifically, the ratio of d3/d4 is, 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, and may be in the range between any two of the values exemplified herein.

In this embodiment, the diameter d3 of the laminated parison P is slightly smaller than the inner diameter d5 of the portion of the inner diameter of the blow molding die 2 that forms the mouth portion 34 of the container body 3, as shown in FIG. 7B. is set to The d3/d5 ratio is, for example, 0.6 to 0.9, more preferably 0.7 to 0.8. Further, the ratio of d3/d5 is specifically, for example, 0.70, 0.71, 0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78 , 0.79, 0.80, and may be in the range between any two of the values exemplified herein. If the diameter d3 of the laminated parison P is too large with respect to the inner diameter d5 of the portion forming the mouth portion 34, burrs may occur during mold clamping. When the ratio becomes too large, molding becomes difficult. However, by setting the ratio of d3/d5 to the above value, the mouth portion 34 can be preferably molded.

The molding of the shape of the container body 3 in the vicinity of the bottom portion 32 by the blow molding die 2 will be described in detail below. As shown in FIG. 7A, split molds 2X and 2Y of the blow molding mold 2 are provided with cutout portions 21X and 21Y, respectively. 7A to 8B, the blow molding die 2 is provided with compression portions 22 below the cutout portions 21X and 21Y. The compression part 22 is formed by the split molds 2X and 2Y, and compresses the laminated parison P when the molds are clamped.

In the present embodiment, as shown in FIGS. 7B and 8B, the compression portion 22 includes first compression regions 22a formed near both ends in the longitudinal direction of the cut-off portions 21X and 21Y, and first compression regions 22a. and a second compression region 22b configured at a position in between. The width d6 of the first compression region 22a when the mold is closed is narrower than the width d7 of the second compression region when the mold is closed. It is preferable that the width d6 of the first compression region 22a at the time of mold clamping is equal to or less than the thickness d8 of the laminated parison P (see FIG. 9A). The width d6 of the first compression region 22a at the time of mold clamping is preferably 1 mm or less, more preferably 0.2 mm or less. Moreover, the width d6 preferably has an interval at which the molds do not completely contact each other, and is preferably 0.01 mm or more, for example. The value of the width d6 is, for example, 0.01 mm to 1.00 mm, preferably 0.05 mm to 0.20 mm. Specifically, for example, 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, and may be in the range between any two of the values exemplified here. On the other hand, it is preferable that the width d7 of the second compression region 22b at the time of clamping is not more than twice the thickness d8 of the laminated parison P. Also, the width d7 is preferably 10 mm or less, more preferably 8 mm or less. Also, the value of the width d7 is, for example, 1.0 mm to 6.0 mm, preferably 2.0 mm to 5.0 mm, still more preferably 3.0 mm to 4.0 mm. Specifically, for example, 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, and may be in the range between any two of the values exemplified herein.

Here, FIGS. 9A to 9C show how the laminated parison P is suspended from the blow molding mold 2 configured as above, and the pair of split molds 2X and 2Y are gradually closed. It is. When the split molds 2X and 2Y are closed from the state before mold clamping in FIG. 9A, the cylindrical laminated parison P is pressed inward by the cutaway portions 21X and 21Y of the split molds 2X and 2Y, and as shown in FIG. 9B. As shown, first, the inner surfaces of the laminated parison P (layers forming the inner bag 6) are brought into contact with each other. When the split molds 2X and 2Y are further closed from this state, the laminated parison P is compressed by the cutout portions 21X and 21Y and the compression portion 22. As shown in FIG. Then, as shown in FIG. 9C, the mold is completely closed, so that the laminated parison P is separated into two by the cut-off portions 21X and 21Y, and a pinch-off portion 32p is formed on the container side.

After the molds are clamped as described above, a blow nozzle is inserted into the opening of the container body 3 on the mouth portion 34 side, and air is blown into the cavity of the split mold while the molds are clamped. After that, the split molds are opened, the blow-molded product is taken out, and the lower burr formed on the lower portion of the pinch-off portion 32p is removed. Then, the molded article molded as described above is subjected to the known inner layer preliminary peeling process, the above-described external air introduction hole 8 forming process, and the like to complete the container body 3 . Finally, by attaching the pump 4 to the mouth portion 34 of the container body 3, the delamination container 1 of the present embodiment is completed.

As shown in FIGS. 9B to 9C, when the split molds 2X and 2Y are closed, the laminated parison P is gradually compressed. At this time, in this embodiment, since the blow molding die 2 has the compression portion 22, the laminated parison P is positioned below (outside the container) above (inside the container) the cutting portions 21X and 21Y. more compressed. Therefore, the crushed laminated parison P tends to flow toward the inner side of the container (see the arrow in FIG. 9B) where the space is wide.

Moreover, the compression portion 22 of the present embodiment includes the first compression region 22a and the second compression region 22b, and the width d6 of the first compression region 22a near both ends in the longitudinal direction of the cut-off portions 21X and 21Y is the It is narrower than the width d7 of the second compression region 22b. As a result, the laminated parison P crushed by the compression portion 22 is prevented from spreading in the lateral direction (longitudinal direction of the cut-off portions 21X and 21Y, lateral direction in FIG. 7B). Therefore, the laminated parison P moves in the vertical direction and is pushed back into the cavity, making it easier for the laminated parison P to flow toward the inside of the container. Blow molding is performed by blowing air in a state in which the laminated parison P is pushed back by the compression part 22 , so that the meat pool 9 can be suitably formed and the inner bag 6 can be made to bite into the outer shell 7 . ing. As a result, the projecting amount d1 of the convex portion 62 of the inner bag 6 can be increased, the fit of the outer shell 7 with the concave portion 72 can be strengthened, and detachment of the inner bag 6 from the bottom portion 32 can be suppressed. It is possible.

Also in the conventional manufacturing method, the laminated parison P is compressed by the compression section 22 . However, in the conventional manufacturing method, since the width of the compression portion 22 is constant, the protruding amount d1 of the convex portion 62 of the inner bag 6 cannot be sufficiently obtained. In this regard, in the manufacturing method of the present embodiment, it is possible to increase the protrusion amount d1 by configuring the compression portion 22 from the above-described first compression region 22a and second compression region 22b. As a result, the ratio d1/d2, which is the length d2 in the longitudinal direction from the center X of the bottom 32 to the tip of the projection 62, can also be increased as described above. It has become. (See FIG. 5B).

Further, in the delaminating container 1 of the present embodiment, as described above, the convex portion 62 of the inner bag 6 is engaged with the concave portion 72 of the outer shell 7 in the meat pool 9 , so that the inner bag 6 is separated from the bottom portion 32 Although it is difficult to detach, it does not mean that the inner bag 6 does not detach at all. That is, since the convex portion 62 of the inner bag 6 is only engaged with the concave portion 72 of the outer shell 7, the remaining content in the delaminating container 1 is very small, and the amount of shrinkage of the inner bag 6 is reduced. When it becomes large, the deformation of the inner bag 6 causes the protrusion 62 and the recess 72 to be disengaged. As a result, the inner bag 6 can be deformed more freely, and the contents can be collected at the end of the tube 44 by the suction of the pump 4, and the contents can be discharged to the end.

4. Modifications The present invention can also be implemented in the following modes.
- In the above-described embodiment, as shown in FIGS. 8A and 8B, the pair of split molds 2X and 2Y of the blow molding mold 2 are configured to be in complete contact with each other outside the first compression region 22a. . However, the blow molding die 2 of the present invention is not limited to such a configuration. That is, as shown in FIG. 10A, it is possible to configure the first compression region 22a to continue to the end of the mold. Further, as shown in FIG. 10B, in the region outside the first compression region 22a (that is, the position where the laminated parison P does not reach during mold clamping), the gap between the pair of split molds 2X and 2Y is the first compression region. It is also possible to make the width larger than the width d6 of 22a.
- In the above-described embodiment, the delamination container 1 is configured to discharge the contents by the pump 4, but it is also possible to configure the container body 3 to be squeezed to discharge the contents.
- In the above-described embodiment, the outside air introduction hole 8 is provided in the bottom portion 32 , but it is also possible to provide it in the body portion 31 . In this case, it is also preferable to provide the outside air introduction hole 8 with a valve member.

1: Delaminated container 2: Blow molding molds 2X, 2Y: Split molds 3: Container body 4: Pump 5: Extruder 5a: Die 6: Inner bag 7: Outer shell 8: Outside air introduction hole 9: Flesh 21X , 21Y: Cut-off portion 22: Compression portion 22a: First compression region 22b: Second compression region 31: Body portion 32: Bottom portion 32p: Pinch-off portion 33: Accommodating portion 34: Mouth portion 34a: Male screw portion 41: Body portion 41a: Cylindrical portion 41b : Cylinder portion 42 : Piston portion 43 : Nozzle 44 : Tube 60 : Inner bag bottom portion 61 : Inner bag protruding portion 62 : Convex portion 70 : Outer shell bottom portion 71 : Holding portion 72 : Concave portion P : Laminated parison R : Region X: center d1: amount of protrusion d2: length from the center of the bottom to the tip of the projection d3: diameter of the laminated parison P d4: diameter of the bottom d5: inner diameter of the portion forming the mouth d6: the first compression region Width d7: Width of second compression area d8: Thickness of laminated parison P

Claims (7)

A lamination-peelable container having an outer shell and an inner bag, wherein the inner bag shrinks as the contents decrease,
A storage portion for storing contents and a pinch-off portion formed at the bottom of the storage portion,
An engaging portion for engaging the outer shell and the inner bag is provided at the end in the longitudinal direction of the pinch-off portion,
The inner bag has a convex portion projecting outward in the longitudinal direction at the engaging portion,
The outer shell has a concave portion that engages with the convex portion in the engaging portion,
The delamination container, wherein the protrusion amount in the longitudinal direction of the protrusion is 0.15 times or more the length in the longitudinal direction from the center of the bottom to the tip of the protrusion. A delaminating container according to claim 1,
A delamination container, wherein the tip of the convex portion protrudes to substantially the same position in the radial direction as the edge of the bottom surface of the inner bag, or protrudes outward beyond the edge of the bottom surface of the inner bag. 3. The delamination container according to claim 1, wherein said pinch-off portion is provided with an outside air introduction hole for introducing outside air into a space between said outer shell and said inner bag. A method for manufacturing a lamination-peelable container having an outer shell and an inner bag, wherein the inner bag shrinks as the contents decrease,
Equipped with a blow molding process using a cylindrical laminated parison,
The mold includes a compression section that compresses the laminated parison before mold clamping and causes the laminated parison to flow inward of the container in the vicinity of the cutout section that forms the pinch-off section of the delaminated container,
The compression portion includes a first compression region configured near both ends in the longitudinal direction of the cutout portion, and a second compression region configured between the first compression regions,
The method for manufacturing a delamination container, wherein the width of the first compression region when the mold is clamped is narrower than the width of the second compression region when the mold is clamped. A method for manufacturing a delamination container according to claim 4,
The method for producing a lamination peeling container, 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 part of the inner diameter of the mold. A method for manufacturing a delamination container according to claim 4 or 5,
The width of the first compression region at the time of mold clamping is equal to or less than the thickness of the laminated parison,
The method for manufacturing a delamination container, wherein the width of the second compression region at the time of mold clamping is not more than twice the thickness of the laminated parison. A method for manufacturing a delamination container according to any one of claims 4 to 6,
The method for manufacturing a delamination container, wherein the second compression region has a width of 5 mm or less when the mold is clamped.

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