JP6540015B2 - Method of manufacturing laminated peeling container - Google Patents

Description

  The present invention relates to a method of manufacturing a laminated peeling container.

DESCRIPTION OF RELATED ART Conventionally, the lamination | stacking peeling container provided with the container main body which has an outer shell and an inner bag and an inner bag peels and shrink | contracts from an outer shell with reduction of the content is known (for example, patent document 1).
Such container bodies are generally manufactured by blow molding using cylindrical laminated parisons. Also, the bottom of the container body is provided with a seal when welding one end of the laminated parison, but since this seal is vulnerable to impact, it is provided to project from the bottom of the container to increase its strength. There is. In Patent Document 1, in order to further increase the strength of the seal portion, the welding layers in the seal portion are fused so as to be mutually engaged by a plurality of indented portions.

Patent No. 3401519

  In order to realize the configuration of Patent Document 1, it is necessary to dispose a pin for pressing the parison fusion layer in the mold, and the mold structure becomes complicated, leading to an increase in production cost. For this reason, it is desired to strengthen the seal portion with a simpler configuration.

  This invention is made in view of such a situation, and provides the manufacturing method of the lamination peeling container excellent in productivity.

  According to the present invention, the container body has an outer shell and an inner bag, and the inner bag peels and contracts from the outer shell as the contents decrease, and the container body accommodates the contents. A storage portion, and an opening portion for discharging the contents from the storage portion, and a central concave region provided substantially at the center of the bottom surface of the storage portion, and a peripheral region provided around the center concave region A method for producing a laminated peeling container in which a central concave area is recessed toward the mouth rather than a peripheral area, and a cylindrical laminated parison including an outer layer constituting the outer shell and an inner layer constituting the inner bag. Forming a seal portion of the laminated parison at the time of blow molding in a thin film shape so as to project beyond the surface defined by the peripheral region in the central concave region; The seal portion is accommodated in the central recessed area Wherein the sealing portion folded comprises a processing or melt processing to the seal portion processing step, the production method of delamination container is provided as.

  In the present invention, a thin film-shaped seal portion formed by compressing the laminated parison is formed to protrude from the central concave region provided on the bottom surface of the container portion of the container body, and the seal portion is bent or By applying melt processing, the seal portion can be strengthened and the seal portion is accommodated in the central recessed area. When the exfoliation container is a small container such as an eye drop container, the amount of depression in the central concave area is also small, and it is not easy to fit the seal in the central concave area, but in the present invention, the seal Since it is in the form of a thin film, it is easy to bend or melt the seal portion and to fit in the central concave area.

Hereinafter, various embodiments of the present invention will be illustrated. The embodiments shown below can be combined with one another.
Preferably, the seal portion is formed such that the maximum thickness thereof is 1/3 or less of the thickness of the laminated parison.
Preferably, the seal portion is formed so that its entire thickness is uniform.

It is a perspective view which shows the structure of the container main body 3 of the lamination peeling container 1 of one Embodiment of this invention. It is sectional drawing which shows the state which mounted | worn the valve member 4 with the container main body 3 of FIG. 1, and bend-processed with respect to the sealing part 27a, and formed the bottom sealing part 27. FIG. (A)-(c) is sectional drawing corresponding to FIG. 2 which shows the process of mounting | wearing the opening part 9 of the container main body 3 of FIGS. 1-2 with the cap 23. FIG. (A)-(c) is sectional drawing corresponding to FIG. 3 (a)-(c) which shows another structure of the opening part 9 and the cap 23. FIG. (A)-(c) is sectional drawing corresponding to FIG. 3 (a)-(c) which shows another structure of the opening part 9 and the cap 23. FIG. (A) is a front view of the cylinder 5, (b) is a bottom view of the cylinder 5, (c) is an A-A sectional view, (d) is a B-B sectional view, (e) is a valve member 4 (F) is a cross-sectional view showing the valve member 4 mounted on the shell 12, (g) is a cross-sectional view showing the movable member 6 in contact with the stopper 5h to close the cavity 5g. It is. (A)-(b) is sectional drawing which shows the example which used the sealing member 8 as a coating member. FIG. 6 is a cross-sectional view showing the configuration of the inner layer 13;

  Hereinafter, embodiments of the present invention will be described. The various features shown in the embodiments described below can be combined with one another. In addition, the invention is established independently for each feature.

  As shown in FIGS. 1 and 2, the laminate peeling container 1 according to the embodiment of the present invention includes a container body 3 and a valve member 4. The container main body 3 includes an accommodating portion 7 for accommodating the contents, and a port 9 for discharging the contents from the accommodating portion 7.

  As shown in FIG. 2, the container body 3 includes the outer layer 11 and the inner layer 13 in the housing portion 7 and the opening 9, the outer layer 11 configures the outer shell 12, and the inner layer 13 configures the inner bag 14. Ru. As the inner layer 13 peels from the outer layer 11 as the content decreases, the inner bag 14 peels from the outer shell 12 and shrinks.

  The mouth 9 is provided with an engaging portion 9 d. In the present embodiment, it is assumed that the stopper type cap 23 as shown in FIG. 3 is attached to the opening 9, and the engaging portion 9 d is engaged with the engaging portion 23 c of the cap 23. It is a ring-shaped protrusion to be engaged. However, in another embodiment, a cap having an internal thread, a pump, or the like may be attached to the opening 9. In this case, the engagement portion 9d is formed of an external thread.

  In addition, a neck portion 9 c which is narrowed toward the inside of the mouth portion 9 is provided in the mouth portion 9 closer to the housing portion 7 than the engagement portion 9 d. The upper wall 9e of the constricted portion 9c extends in a direction substantially perpendicular to the central axis C of the mouth 9, and extends from the outer end of the upper wall 9e at an angle of 45 degrees to 135 degrees with respect to the upper wall 9e. A wall 9f is provided. The angle of the standing wall 9f with respect to the upper wall 9e is preferably 60 degrees to 120 degrees, and more preferably 75 degrees to 105 degrees. In the present embodiment, the standing wall 9f extends substantially perpendicularly to the upper wall 9e. A gap is provided between the inner layer 13e on the upper wall 9e and the inner layer 13f on the standing wall 9f, and the inner layer 13e and the inner layer 13f are not integrated. In another expression, the inner layer 13 is not held between the outer layer 11 e at the upper wall 9 e and the outer layer 11 f at the upright wall 9 f.

  Further, an opposing wall 9g is provided which extends from the upper end of the upright wall 9f toward the inside of the mouth 9 (in the direction of the central axis C). The angle of the opposing wall 9g with respect to the upper wall 9e is not particularly limited, but is, for example, -10 to 80 degrees, and in the present embodiment, it is about 30 degrees. A gap is provided between the inner layer 13e at the upper wall 9e and the inner layer 13g at the opposing wall 9g, and the inner layer 13e and the inner layer 13g are not integrated. In another expression, the inner layer 13 is not held by the outer layer 11 e at the upper wall 9 e and the outer layer 11 g at the opposing wall 9 g.

  As described above, in the present embodiment, since the inner layer 13 is not restrained by the outer layer 11 in the mouth 9, the inner layer 13 peels smoothly from the outer layer 11.

  Next, a method of attaching the cap 23 to the mouth 9 will be described with reference to FIG. The cap 23 to be mounted includes a main body 23a, a discharge port 23b provided in the main body 23a, an engagement portion 23c provided at a substantially distal end of an outer peripheral portion 23f cylindrically extending from the main body 23a, and an outer peripheral portion 23f. The inner ring 23d cylindrically extends from the main body 23a inside, the flow passage 23g provided inside the inner ring 23d and communicating with the discharge port 23b, and the check valve 23e provided in the flow passage 23g. With the cap 23 attached to the opening 9, the contents in the storage unit 7 are discharged from the discharge port 23b through the flow passage 23g. On the other hand, since the check valve 23e blocks the inflow of the outside air from the discharge port 23b, the outside air does not intrude into the inner bag 14 of the container body 3, and the deterioration of the contents is suppressed. In addition, the structure of the cap 23 shown here is an example, Comprising: For example, you may employ | adopt the cap 23 which has a non-return valve of another structure.

  When the cap 23 is attached, first, as shown in FIG. 3A, the upper wall of the constricted portion 9c is used to prevent the accommodation portion 7 from being deformed by an impact when the cap 23 is attached. The support 10 is brought into contact with the lower surface 9e, and in this state, the engaging portion 23c of the cap 23 is engaged with the engaging portion 9d of the opening 9 as shown in FIGS. 3 (b) to 3 (c). . When the engaging portion 23c passes over the engaging portion 9d from the state of FIG. 3B, the outer peripheral portion 23f of the cap 23 bends so as to expand in diameter and the opening 9 bends so as to decrease in diameter. Although it is easy to attach the cap 23 if the opening 9 is easy to bend, the opening 9 of this embodiment is provided with a support ring as disclosed in JP-A-11-292112. Since the support 10 is in contact with the lower surface of the upper wall 9e of the constricted portion 9c to support the port 9, the port 9 is easily bent and the cap 23 can be easily attached. In addition, since the mouth 9 is easy to bend, the inner bag 14 is easy to bend to the vicinity of the container outlet, and the contents are easy to use up to the end.

  The mouth 9a is provided with a contact portion 9a against which the outer surface of the inner ring 23d abuts, and the outer surface of the inner ring 23d abuts against the contact portion 9a of the mouth 9 so that the contents leak Is prevented. In the present embodiment, the enlarged diameter portion 9b is provided at the tip of the opening 9, and the inner diameter at the enlarged diameter portion 9b is larger than the inner diameter at the abutting portion 9a. The outer surface is not in contact with the enlarged diameter portion 9b. In the case where the opening 9 does not have the enlarged diameter portion 9b, the inner ring 23d may enter between the outer layer 11 and the inner layer 13 when the inner diameter of the opening 9 is slightly reduced due to manufacturing variations. In the case where the opening 9 has the enlarged diameter portion 9b, such a problem does not occur even if the inner diameter of the opening 9 is slightly dispersed.

  In addition, even when the enlarged diameter portion 9 b is provided in the mouth portion 9, there is a possibility that the inner layer 13 may be separated from the outer layer 11 due to the friction between the inner ring 23 d and the contact portion 9 a. However, in the present embodiment, the neck portion 9 c is provided at a position closer to the housing portion 7 than the contact portion 9 a, and the neck portion 9 c suppresses the slippage of the inner layer 13. Dropping inside is suppressed. As described above, the constricted portion 9 c has a function of suppressing the displacement of the inner layer 13 and also has a function as a supporting point of the opening 9 by the support 10 when the cap 23 is attached.

Here, another configuration example of the mouth 9 and the cap 23 is shown using FIGS. 4 to 5.
The configuration of FIG. 4 is the main difference from the configuration of FIG. 3 in that the position of the contact portion 9a is different. In the configuration of FIG. 3, the contact portion 9a is located closer to the container outlet than the engagement portion 9d, whereas in the configuration of FIG. 4, the contact portion 9a is closer to the container outlet than the engagement portion 9d. It is separated and provided between the engaging portion 9 d and the constricted portion 9 c. Although any of the configurations is possible, in addition to the fact that the volume in the container body 3 can be effectively used, the configuration of FIG. 3 can also peel off the inner layer 11 to a position close to the container outlet. It is advantageous at the point which is easy to discharge a thing to the last.

  In the configuration of FIG. 5, the opposing wall 9g is substantially parallel to the upper wall 9e, and the upper wall 9e, the standing wall 9f, and the opposing wall 9g form a substantially "U" shape (horizontally U-shaped) Is the main difference from the configuration of FIG. In such a configuration, a gap is provided between the inner layers 13e, 13f, and 13g, and these are not integrated. Therefore, the same function and effect as the configuration of FIG. 3 can be obtained. In the case of the configuration shown in FIG. 5, when the distance between the upper wall 9e and the opposing wall 9g is short, the inner layer 13e and the inner layer 13g easily come into contact with each other and are integrated, the lower surface of the upper wall 9e and the upper surface of the opposing wall 9g It is preferable that the distance between the two is 2.5 or more times the thickness of the upper wall 9e (the total thickness of the outer layer 11e and the inner layer 13e). In this case, a gap of about half the thickness of the upper wall 9 e is formed between the inner layer 13 e and the inner layer 13 g.

  As shown in FIGS. 1 and 2, the housing portion 7 has a substantially cylindrical shape, and includes a cylindrical cylindrical portion 7 b and a panel portion 7 c formed by recessing a part of the cylindrical portion 7 b. The container body 3 is formed by blow molding a cylindrical (for example, cylindrical) laminated parison. Therefore, the wall thickness of each part of the container body 3 increases with the blow ratio (the distance from the central axis C Becomes smaller). The panel portion 7c is closer to the central axis C than the cylindrical portion 7b, so the thickness thereof is larger than that of the cylindrical portion 7b. Therefore, the rigidity of the panel portion 7c is higher than that of the cylindrical portion 7b, the panel portion 7c becomes a high rigidity portion, and the cylindrical portion 7b becomes a low rigidity portion.

  The contents in the storage part 7 are discharged by compressing and deforming the storage part 7, but when the storage part 7 is compressed by pinching the cylindrical part 7 b and the panel part 7 c, the cylindrical part 7 b with low rigidity Since deformation occurs preferentially, the amount of deformation of the cylindrical portion 7b becomes larger than that of the panel portion 7c. And since the inner layer 13 is easy to be peeled from the outer layer 11 in the site | part with a large deformation amount, peeling of the inner layer 13 tends to advance preferentially in the cylindrical part 7b. In the present embodiment, the outer shell 12 is provided with an external air introducing hole 15 communicating the intermediate space 21 between the outer shell 12 and the inner bag 14 and the outer space S of the container body 3 in the housing portion 7. Since the outside air introduction hole 15 is provided on the side of the cylindrical portion (low rigidity portion) 7b, the outside air is smoothly introduced into the intermediate space 21 between the outer shell 12 and the inner bag 14 when the inner layer 13 peels off. , And the inner layer 13 peels smoothly from the outer layer 11. Therefore, the inner bag 14 contracts smoothly when the storage portion 7 is compressed, and the outer shell 12 smoothly restores the original shape when the compression force is removed.

  The outside air introduction hole 15 can be provided at any position of the cylindrical portion (low rigidity portion) 7b, but is preferably provided at a position facing the panel portion 7c. This is because when the cylindrical portion 7 b and the panel portion 7 c are pinched to compress the housing portion 7, the cylindrical portion 7 b is most greatly deformed at the position facing the panel portion 7 c.

  Further, in the present embodiment, the outside air introduction hole 15 is provided with a valve member 4 for adjusting the flow of air between the intermediate space 21 and the external space S. The valve member 4 is mounted on a valve member mounting recess 7 a provided in the housing portion 7. The valve member 4 is closed when the storage portion 7 is compressed, and the pressure in the intermediate space 21 is increased by blocking the flow of air from the intermediate space 21 toward the external space S, and the pressure applied to the outer shell 12 It has a function to facilitate transmission to the inner bag 14. For this reason, even when the content in the inner bag 14 is reduced, the contents can be easily discharged. On the other hand, the valve member 4 has a function of opening when the compressive force applied to the accommodating portion 7 is removed and allowing air from the external space S to the intermediate space 21 to pass therethrough. Therefore, the outside air is introduced into the intermediate space 21 and the outer shell 12 smoothly returns to the original shape. Since the inner bag 14 can be directly compressed through the outer shell 12 by largely deforming the outer shell 12 even without the valve member 4, the valve member 4 is not an essential component.

  As described above, the valve member 4 only needs to have a function capable of opening and closing the outside air introduction hole 15. As a configuration example thereof, a through hole and an openable and closable valve are provided in the valve member 4 itself. By opening and closing the through hole by the function of the valve, the outside air introduction hole 15 is opened and closed, or the gap between the edge of the outside air introduction hole 15 and the valve member 4 is opened and closed by the movement of the valve member 4 By doing this, the valve member 4 may be configured to open and close the outside air introduction hole 15. Since the valve member 4 functions without problems even when the size of the outside air introduction hole 15 has some variations, the former valve member 4 is suitably applied particularly to a small-sized container such as an eye drop container.

  Here, an example of the valve member 4 will be described with reference to FIGS. 2 and 7. The valve member 4 includes a cylindrical body 5 having a hollow portion 5g provided to communicate the outer space S with the intermediate space 21 and a movable body 6 housed movably in the hollow portion 5g. The cylinder 5 and the movable body 6 are formed by injection molding or the like, and the movable body 6 is disposed in the hollow portion 5g by pushing the movable body 6 into the hollow portion 5g so as to get over the stopper portion 5h described later. be able to. In the present embodiment, the hollow portion 5g has a substantially cylindrical shape, and the movable body 6 has a substantially spherical shape, but may have another shape as long as the same function as the present embodiment can be realized. . The diameter of the cavity 5g in the cross section (the cross section in FIG. 6D) is slightly larger than the diameter in the corresponding cross section of the mobile body 6, and the mobile body 6 has an arrow in FIG. It has a shape that can be freely moved in the B direction. The value of the ratio defined by the diameter of the cross section of the hollow portion 5g / the diameter of the corresponding cross section of the moving body 6 is preferably 1.01 to 1.2, and more preferably 1.05 to 1.15. If this value is too small, the smooth movement of the moving body 6 will be impeded, and if this value is too large, the gap between the surface 5j surrounding the cavity 5g and the moving body 6 will be too large, and the container body 3 will be compressed. This is because the force applied to the moving body 6 is likely to be insufficient when it occurs.

  The cylindrical body 5 is provided with a shaft portion 5a disposed in the outside air introduction hole 15, a locking portion 5b provided on the external space S side of the shaft portion 5a and preventing the cylindrical body 5 from entering the intermediate space 21; It has an expanded diameter portion 5 c which is provided on the side of the intermediate space 21 of the portion 5 a and prevents the cylindrical body 5 from being pulled out from the outside of the container main body 3. The shaft 5 a is tapered toward the intermediate space 21. That is, the outer peripheral surface of the shaft portion 5a is a tapered surface. Then, the cylindrical body 5 is mounted on the container main body 3 by the outer peripheral surface of the shaft 5 a being in close contact with the edge of the outside air introducing hole 15. With such a configuration, the gap between the edge of the outside air introduction hole 15 and the cylindrical body 5 can be reduced, and as a result, when the container body 3 is compressed, the air in the intermediate space 21 becomes smaller than that of the outside air introduction hole 15. It is possible to suppress outflow from the gap between the edge and the cylindrical body 5. In addition, since the cylindrical body 5 is attached to the container main body 3 by the outer peripheral surface of the axial part 5a closely_contact | adhering to the edge of the external air introduction hole 15, the bulging part 5c is not necessarily essential.

  The surface 5 j surrounding the hollow portion 5 g is provided with a stopper portion 5 h that locks the movable body 6 when the movable body 6 moves from the intermediate space 21 side toward the external space S side. The stopper portion 5h is formed of an annular protrusion, and when the movable body 6 abuts on the stopper portion 5h, the flow of air through the hollow portion 5g is blocked.

  Further, the tip end of the cylindrical body 5 is a flat surface 5d, and the flat surface 5d is provided with an opening 5e communicating with the hollow portion 5g. The opening 5e has a substantially circular central opening 5e1 provided at the center of the flat surface 5d, and a plurality of slits 5e2 radially extending from the central opening 5e1. According to such a configuration, the flow of air is not impeded even when the movable body 6 is in contact with the bottom of the hollow portion 5g.

  As shown in FIG. 6 (f), the valve member 4 is inserted into the outside air introduction hole 15 from the side of the expanded diameter portion 5c, and is pushed to a position where the locking portion 5b abuts on the outer surface of the outer shell 12 The outer shell 12 holds the outer peripheral surface of the portion 5 a in close contact with the edge of the outside air introduction hole 15. When the shell 12 is compressed with air in the intermediate space 21, the air in the intermediate space 21 enters the cavity 5g through the opening 5e to push up the movable body 6 to abut the stopper 5h. When the moving body 6 abuts on the stopper portion 5h, the flow of air through the hollow portion 5g is blocked.

  When the outer shell 12 is further compressed in this state, the pressure in the intermediate space 21 increases, and as a result, the inner bag 14 is compressed and the contents in the inner bag 14 are discharged. Also, when the compressive force on the shell 12 is released, the shell 12 tries to be restored by its own elasticity. By the pressure in the intermediate space 21 being reduced with the restoration of the outer shell 12, as shown in FIG. 6 (g), a force FI in the container inner direction is applied to the movable body 6. As a result, the movable body 6 moves toward the bottom of the hollow portion 5g to be in the state shown in FIG. 6 (f), passes through the gap between the movable body 6 and the surface 5j and the opening 5e to the outside space 21. Is introduced.

  The valve member 4 can be mounted on the container main body 3 by inserting the expanded diameter portion 5c into the intermediate space 21 while the expanded diameter portion 5c spreads the outside air introducing hole 15. Therefore, it is preferable that the tip of the expanded diameter portion 5c has a tapered shape. Such a valve member 4 can be mounted only by pushing the expanded diameter portion 5 c into the intermediate space 21 from the outside of the container main body 3, so that the productivity is excellent. In addition, since the flat surface 5d is provided at the tip of the cylindrical body 5, even when the tip of the valve member 4 collides with the inner bag 14 when the valve member 4 is pushed into the intermediate space 21, the inner bag 14 It is hard to get hurt.

  In a state where the valve member 4 is mounted, a covering member may be provided to cover the periphery of the valve member 4 and the outside air introducing hole 15 to prevent the introduction of the outside air into the intermediate space 21. According to such a configuration, it is possible to prevent the odorous gas in the factory from intruding into the intermediate space 21 in the manufacturing process. For example, after the contents are filled into the inner bag 14, the covering member can be attached in a clean atmosphere. Moreover, according to such a configuration, when sterilizing the container with high temperature steam, it is possible to prevent the steam from invading the intermediate space 21 from the outside air introduction hole 15 and the moisture remaining in the intermediate space 21. . In the state where the valve member 4 and the outside air introduction hole 15 are covered by the covering member, the outside air is not introduced into the intermediate space 21 and is not restored to the original shape after the outer shell 12 is compressed. It is assumed to use in the state.

  As a specific configuration example, as shown in FIGS. 7A and 7B, an example in which a seal member 8 adhered around the valve member 4 and the outside air introduction hole 15 is provided. In the example of FIG. 7A, the seal member 8 is attached on an annular convex portion 7d provided so as to surround the valve member attachment concave portion 7a. In the example of FIG. 7B, the seal member 8 is attached on the annular convex portion 7d provided so as to surround the valve member 4 and the outside air introduction hole 15 in the valve member attachment concave portion 7a. In the example of FIG. 7 (b), the seal member 8 can be prevented from protruding from the surface of the outer shell 12.

  As shown in FIGS. 1 and 2, the bottom surface 29 of the housing portion 7 is provided with a central concave area 29a and a peripheral area 29b provided around the center concave area 29a, and the central concave area 29a is as shown in FIG. , And a bottom seal portion 27 projecting from the bottom surface 29 is provided. The method of forming the bottom seal portion 27 is as follows.

  First, as shown in FIG. 1 (b), the seal portion 27a of the laminated parison at the time of blow molding a cylindrical laminated parison including the outer layer 11 and the inner layer 13 is defined in the central concave area 29a by the peripheral area 29b. It is formed in a thin film shape so as to protrude beyond the surface P (shown in FIG. 2) (seal portion forming step). The seal portion 27a can be formed by sandwiching the laminated parison 27a between split molds and compressing the same during blow molding. The seal portion 27a is preferably formed so that the maximum thickness thereof is 1/3 or less (preferably 1/4 or 1/5 or less) of the thickness of the laminated parison. The thickness of the seal portion 27a is, for example, 0.1 to 0.4 mm, preferably 0.2 to 0.3 mm. In one example, a cylindrical laminated parison with a wall thickness of 1.5 mm is compressed to 0.25 mm at seal portion 27a. The seal portion 27a is preferably formed so that the overall thickness thereof is uniform.

  Next, as shown in FIG. 2, the bottom seal portion 27 is formed by bending the seal portion 27a so that the seal portion 27a is accommodated in the central recessed area 29a. Since the seal portion 27a is in the form of an extremely thin film, it is easy to bend and fit in the central recessed area 29a. Further, melt processing may be applied to the seal portion 27a instead of bending. Since the seal portion 27a is in the form of a thin film, it is easily melted and contained in the central recessed area 29a.

  The impact resistance at the bottom surface 29 of the container main body 3 can be improved by bending or melting the seal portion 27 a to form the bottom seal portion 27. Further, since the bottom seal portion 27 does not protrude from the surface P, when the layer peeling container 1 is erected, the bottom seal portion 27 protrudes from the surface P and the self-supporting property of the layer peeling container 1 is inhibited. Is prevented.

  Further, as shown in FIG. 1B, the recessed area of the bottom surface 29 is provided to cross the entire bottom surface 29 in the longitudinal direction of the seal portion 27a. That is, the central concave area 29a and the peripheral concave area 29c are connected. Such a configuration makes it easy to bend the seal portion 27a.

  Next, the layer configuration of the container body 3 will be described in more detail. The container body 3 includes an outer layer 11 and an inner layer 13. The outer layer 11 is formed thicker than the inner layer 13 so as to be highly recoverable.

  The outer layer 11 is made of, for example, low density polyethylene, linear low density polyethylene, high density polyethylene, polypropylene, an ethylene-propylene copolymer, and a mixture thereof. When the diameter of the container is 30 mm or less, the outer layer 11 is preferably configured to contain low density polyethylene. According to this configuration, squeeze for discharging the content liquid is facilitated. For example, the outer layer 11 can be composed of a low density polyethylene single layer. The outer layer 11 can also be formed of multiple layers of low density polyethylene and a recycled material using burrs at the time of molding.

  As shown in FIG. 8, in the present embodiment, the inner layer 13 includes an innermost layer 13a in contact with the contents and a cover layer 13b slidable with respect to the innermost layer 13a. In general, a configuration is adopted in which the covering layer 13b made of EVOH resin or the like, which has high oxygen barrier properties, is bonded to the innermost layer 13a and integrated, but since the EVOH resin has high rigidity, The inner layer 13 in which the covering layer 13b and the innermost layer 13a are integrated is difficult to be deformed, and the inner bag 14 may not be shrunk smoothly. On the other hand, in the present embodiment, the innermost layer 13a is not bonded to the covering layer 13b, and the innermost layer 13a can slide relative to the covering layer 13b. For this reason, even if the rigidity of the covering layer 13b is high, the innermost layer 13a is relatively freely deformable, so the inner bag 14 contracts smoothly. Further, since the innermost layer 13a and the covering layer 13b are separated, there is a problem if the innermost layer 13a is not scratched even if the covering layer 13b is accidentally scratched when forming the outside air introducing hole 15. It does not occur.

  When the innermost layer 13a and the covering layer 13b are not adhered to each other, the outside air introducing hole 15 may be formed to penetrate the outer layer 11 and the covering layer 13b. In this case, the outside air is introduced to the space between the innermost layer 13a and the covering layer 13b.

  The innermost layer 13a is a layer in contact with the contents of the laminated peeling container 1, for example, polyolefins such as low density polyethylene, linear low density polyethylene, high density polyethylene, polypropylene, ethylene-propylene copolymer and a mixture thereof , EVOH resin and the like. 50-300 Mpa is preferable and 70-200 Mpa of the tensile elasticity modulus of resin which comprises the innermost layer 13a is preferable. This is because the innermost layer 13a is particularly flexible when the tensile modulus is in such a range. Specifically, the tensile modulus is, for example, 50, 100, 150, 200, 250, 300 Mpa, and may be in the range between any two of the numerical values exemplified here. When the content is a chemical solution, the innermost layer 13a is preferably made of polypropylene or EVOH resin to make it difficult for the chemical solution component to be adsorbed to the innermost layer 13a. In this case, it is particularly preferable to use polypropylene as the innermost layer 13a because the inner layer is made more flexible and the contraction of the inner layer proceeds smoothly and the occurrence of pinholes and the like can be prevented. Further, from the viewpoint of flexibility, a propylene random copolymer is particularly preferable as the innermost layer 13a. The propylene random copolymer is a random copolymer between propylene and another monomer, and the content of monomers other than propylene is less than 50 mol%, preferably 5 to 35 mol%. Specifically, this content is, for example, 5, 10, 15, 20, 25, 30 mol%, and may be in the range between any two of the numerical values exemplified here. Ethylene is particularly preferred as the monomer to be copolymerized with propylene. In the case of a random copolymer of propylene and ethylene, the content of ethylene is preferably 5 to 30 mol%, and specifically, for example, 5, 10, 15, 20, 25, 30 mol%, and the numerical values exemplified here It may be in the range between any two.

  The covering layer 13 b is a layer provided for the purpose of imparting oxygen barrier property and the like, and is preferably made of EVOH resin. When the covering layer 13 b is made of EVOH resin, the releasability between the outer layer 11 and the inner layer 13 is improved.

  EVOH resin is ethylene-vinyl alcohol copolymer (EVOH) resin, and is obtained by hydrolysis of ethylene and a vinyl acetate copolymer. The ethylene content of the EVOH resin is, for example, 25 to 50 mol%, and preferably 32 mol% or less from the viewpoint of oxygen barrier properties. The lower limit of the ethylene content is not particularly limited, but the flexibility of the EVOH resin tends to decrease as the ethylene content decreases, so 25 mol% or more is preferable. Moreover, it is preferable that EVOH resin contains an oxygen absorbent. The oxygen barrier property of the EVOH resin can be further improved by incorporating the oxygen absorber into the EVOH resin.

  The melting point of the EVOH resin is preferably higher than the melting point of the resin constituting the outer layer 11. When the outside air introduction hole 15 is formed in the outer layer 11 using a heating type perforation device, the outside air introduction hole 15 is formed in the outer layer 11 by setting the melting point of the EVOH resin higher than the melting point of the resin constituting the outside layer 11 When doing so, the holes can be prevented from reaching the inner layer 13. From this viewpoint, the difference between (the melting point of EVOH) − (the melting point of the resin constituting the outer layer 11) is preferably large, preferably 15 ° C. or more, and particularly preferably 30 ° C. or more. The difference between the melting points is, for example, 5 to 50 ° C., and specifically, for example, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50 ° C., any of the numerical values exemplified here It may be in the range between or two.

  When the configuration of the inner layer is not limited in the claims, the configuration of the inner layer 13 is not limited. In that case, an adhesive layer may be provided between the innermost layer 13a and the covering layer 13b. The adhesive layer is a layer having a function of adhering the coating layer 13b and the innermost layer 13a, and, for example, one obtained by adding an acid-modified polyolefin (eg, maleic anhydride-modified polyethylene) in which a carboxyl group is introduced to the above-described polyolefin, Ethylene vinyl acetate copolymer (EVA). An example of the adhesive layer 13 is low density polyethylene or a mixture of linear low density polyethylene and acid-modified polyethylene.

1: laminated peeling container, 3: container body, 4: valve member, 5: cylinder, 6: moving body, 7: accommodation portion, 9: mouth, 11: outer layer, 12: outer shell, 13: inner layer, 14 : Inner bag, 15: Outside air introduction hole, 21: Intermediate space, 23: Cap, 27: Bottom seal portion

Claims (3)

A container body having an outer shell and an inner bag, wherein the inner bag peels off and shrinks from the outer shell as the contents decrease, and the container body contains the contents; A central concave area provided at the approximate center of the bottom surface of the storage section, and a peripheral area provided around the central area; and the central concave area is a peripheral area A method of manufacturing a laminated peeling container that is recessed more toward the mouth than
The seal portion of the laminated parison at the time of blow molding a cylindrical laminated parison comprising the outer layer constituting the outer shell and the inner layer constituting the inner bag is a surface in contact with the central concave region and the peripheral region. Forming a seal portion so as to be in a thin film shape so as to protrude beyond it;
A manufacturing method of a exfoliation peeling container, comprising: a seal part processing step of bending or melt processing the seal part so that the seal part is accommodated in the central concave area. The method according to claim 1, wherein the seal portion is formed such that the maximum thickness thereof is equal to or less than 1/3 of the thickness of the laminated parison. The method according to claim 1, wherein the seal portion is formed to have a uniform overall thickness.