JP2016141419A - Double container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a double container that can discharge contents by own weight thereof by having a slit-like outside air introduction hole provided in a pinch-off part formed in a predetermined length, that further can achieve smooth discharge by squeezing an outer coat when the remaining amounts of the contents are reduced, and does not cause increase in costs.SOLUTION: A double container 1 comprises an outer coat 10 forming an outer shell of the container, and an inner coat 20 that is stored inside the outer coat 10 and can be freely reduced in volume and deformed. A pinch-off part, which is formed at a bottom part by cutting-off by a blow-molding split mold, has a linear slit 14 penetrating through the outer coat 10. Outsides of both end parts 14a and 14b of the slit 14 are provided with a pair of reinforcing ribs 15a and 15b which extend along an extension line L of the slit 14. Thicknesses of the pair of reinforcing ribs 15a and 15b are in the range of 2.5 mm or more and 3.5 mm or less.SELECTED DRAWING: Figure 1

Description

  The present invention includes an outer layer body that forms an outer shell of a container, and a volume-reducing and deformable inner layer body that is housed inside the outer layer body, and is a dual body that reduces only the inner layer body as the contents are discharged. It relates to the container.

  As a container for storing cosmetics such as lotion, shampoo, rinse, liquid soap, food seasoning, etc., an outer layer body that forms the outer shell of the container, and a volume-reducing and deformable container that can be stored inside the outer layer body A double container (delamination) in which the outer layer body is provided with an opening for introducing outside air that communicates with the inner layer body, and only the inner layer body is reduced as the contents are discharged. Also known as a container).

  In addition, as a discharge method of the contents, a pump attached to the mouth portion of the outer layer body, a method mainly by squeezing the body portion of the outer layer body, and a method mainly based on the weight of the contents (for example, a patent) Reference 1)). Containers that use pumps have a complicated structure and an inevitable increase in cost, and containers that use squeeze of the outer layer body are relatively simplified, but only the inner layer body is reduced in volume. In order to achieve this, it is necessary to provide an outside air introduction valve that closes the opening for introducing outside air when pressed against the outer layer body and opens when the pressure is released. On the other hand, a container that uses the weight of its contents has a simple structure and does not require an outside air introduction valve.

  In particular, in a container that uses the self-weight of such contents, a parison formed by laminating an outer layer body made of synthetic resin and an inner layer body formed of a synthetic resin having low compatibility with the outer layer body is used. In the case of forming by blow molding, the pinch-off portion formed at the bottom by biting with a blow molding die can be used as it is as the outside air introduction hole. That is, the inner layer body can be peeled from the outer layer body by breaking the bottom wall of the outer layer body in the pinch-off portion, and a slit-like outside air introduction hole can be provided in the pinch-off portion.

JP 2008-207860 A

  By the way, the inner layer body of the double container has been devised in various ways to reduce the volume evenly, but due to variations in the thickness of the container itself, a portion that tends to collapse preferentially occurs. is there. As a result, as the discharge of the contents progresses, the inner surfaces of the inner layer bodies may partially contact each other, which may narrow the passage of the contents. In the case of providing the introduction valve, the contents can be discharged to the end. However, in a blow-molded double container that uses the pinch-off part as an outside air introduction hole and discharges the contents mainly by its own weight, for example, molding variations such as the crimping force of the mold and the peeling process, and repeated use, the end The slit-shaped outside air introduction hole may be longer than the expected length due to reasons such as a crack from the portion. In such a case, even if the outer layer body is squeezed, the air between the outer layer body and the inner layer body leaks from the outside air introduction hole and the inner layer body cannot be sufficiently reduced in volume. There was a problem that it became difficult. For this reason, a new double container which improved this point was desired.

  The present invention aims to solve such a conventional problem, and its purpose is to form a slit-like outside air introduction hole provided in the pinch-off portion to a desired length, The contents can be discharged by its own weight, and when the remaining amount of the contents is reduced, smooth discharge by squeezing the outer layer body can be realized and the cost is not increased. There is a place to propose a heavy container.

The present invention has been made to solve the above problems, and the double container of the present invention has a bottle shape having a mouth portion, a trunk portion, and a bottom portion, and an outer layer body that forms an outer shell of the container; In a double container comprising a volume-reducing and deformable inner layer body accommodated inside the outer layer body,
A pinch-off portion formed in the bottom portion by cutting with a blow molding die has a linear slit that penetrates the outer layer body, and extends outside the both ends of the slit along an extension line of the slit. A pair of existing reinforcing ribs,
A thickness of the pair of reinforcing ribs is in a range of 2.5 mm to 3.5 mm.

  In the double container according to the present invention, at least one biting portion is formed in the at least one reinforcing rib of the pair of reinforcing ribs from the side surface on one side to the side surface on the other side. Preferably it is.

  Further, in the double container of the present invention, it is preferable that a pair of biting portions provided so that the biting directions oppose each other is formed on at least one of the pair of reinforcing ribs. .

  According to the present invention, the slit-like outside air introduction hole provided in the pinch-off portion is formed to have a desired length, so that the content can be discharged by its own weight and the remaining amount of the content is reduced. In this case, smooth discharge by squeezing the outer layer body can be realized, and a double container that does not increase the cost can be provided.

It is the front view which showed the double container which concerns on one Embodiment of this invention in the partial cross section. It is a bottom view of the double container shown in FIG. (A) is sectional drawing which shows the AA cross section in the double container of FIG. 1, (b) is sectional drawing which shows the BB cross section in the double container of FIG.

  Hereinafter, the present invention will be described in more detail with reference to the drawings. FIG. 1 is a front view showing a double container according to an embodiment of the present invention.

  The double container 1 includes an outer layer body 10 that forms an outer shell of the container, and a volume-deformable inner layer body 20 that is housed inside the outer layer body 10, and between the outer layer body 10 and the inner layer body 20, An adhesive band 30 for joining the outer layer body 10 and the inner layer body 20 to each other is provided.

  Here, the double container 1 in this embodiment includes a synthetic resin outer layer body 10, an inner layer body 20 formed of a synthetic resin having low compatibility with the outer layer body 10, and the outer layer body 10 and the inner layer body. 20 is formed by laminating a belt-like adhesive layer formed of a synthetic resin having adhesiveness to 20, that is, an adhesive band 30, and blow molding a parison formed by laminating these synthetic resins. It was obtained by Here, in the double container 1 of the present embodiment, the outer layer body 10 has a two-layer structure of an outer low density polyethylene (LDPE) and an inner polypropylene resin (PP), and the inner layer body 20 is made of an outer ethylene vinyl alcohol. It has a two-layer structure of a polymer resin (EVOH) and an inner modified polyolefin resin (“Admer” (registered trademark) manufactured by Mitsui Chemicals, Inc.). The adhesive band 30 is made of a modified polyolefin resin (“Admer” (registered trademark)). In this embodiment, in order to impart squeeze properties, the outer layer of the outer layer body 10 is composed of low density polyethylene (LDPE), but polypropylene resin (PP), medium density polyethylene resin (MDPE), or High density polyethylene resin (HDPE) can also be used. Moreover, the layer of the polypropylene resin (PP) constituting the outer layer body 10 of the present embodiment is provided to improve the peelability of the inner layer body 20, and is not necessarily required. Furthermore, the above layer configuration is an example, and the material of the outer layer body 10, the inner layer body 20, and the adhesive band 30 is not particularly limited as long as the inner layer body 20 can be peeled from the outer layer body 10. Each may have a single layer structure or a multilayer structure.

  The outer layer body 10 has reversible flexibility, and includes a bottom wall 11 that forms the bottom of the outer layer body 10, and a side wall 12 that is connected to the outer edge of the bottom wall 11 and forms the body of the outer layer body 10. And a mouth wall 13 which is connected to the upper portion of the side wall 12 and has a cylindrical shape and forms a mouth portion of the outer layer body 10. The inner layer body 20 has a filling space M in which the contents can be filled inside, and can be reduced in volume by being peeled off from the laminated outer layer body 10.

  In the present embodiment, the side wall 12 has a circular cross section and has a cylindrical shape whose diameter is reduced toward the mouth wall 13, but is not limited thereto. It may be oval or the like. The mouth wall 13 is provided with a screw portion 13a for mounting a lid or the like.

  The bottom wall 11 has an annular outer edge portion 11a serving as a ground contact surface, and a concave portion 11b recessed toward the mouth wall 13 inside the outer edge portion 11a. As shown in the bottom view of FIG. 2, a slit 14 as an outside air introduction hole is formed in the central region of the recess 11 b of the bottom wall 11 and extends linearly through the inside and outside of the outer layer body 10. Further, a pair of reinforcing ribs 15 a and 15 b extending along the extension line L of the slit 14 are provided outside the both end portions 14 a and 14 b of the slit 14. The thickness T of the reinforcing ribs 15a and 15b is in the range of 2.5 mm to 3.5 mm. In the present embodiment, the thickness T is 3 mm.

  Each of the reinforcing ribs 15a and 15b is formed with a pair of biting portions 16a and 16b that are bitten from the side surface on one side toward the side surface on the other side. Here, Fig.3 (a), (b) shows the AA cross section and BB cross section of the double container 1 shown in FIG. As shown in the drawing, the biting portion 16a located on the radially inner side and the biting portion 16b located on the radially outer side face each other in the biting direction. In the present embodiment, the biting portions 16a and 16b are provided on the pair of reinforcing ribs 15a and 15b so as to have a shape rotated 180 degrees around the central axis C of the double container 1. In the present invention, the biting portions 16a and 16b provided in the reinforcing ribs 15a and 15b are not essential components, and the number, position, and biting direction are not particularly limited.

  In the present embodiment, the side wall 12 is provided with only one adhesive band 30, and the adhesive band 30 extends along the direction of the central axis C of the container from the vicinity of the one reinforcing rib 15b. It extends to the mouth wall 13. Note that the end portion of the adhesive band 30 may overlap the reinforcing rib 15b or may end before the reinforcing rib 15b. In the present embodiment, the adhesive band 30 extends along the extension line L of the slit 14 and along the parting line of the side wall 12 formed by the split mold, and is on the bottom wall 11 side of the adhesive band 30. The end portion of is overlapped with the outer end portion of the reinforcing rib 15b. The length, width, and number of the adhesive bands 30 are not particularly limited and can be appropriately changed. Furthermore, the adhesive band 30 is not limited to linearly extending, and may have a bent portion or a curved portion. In the present invention, the adhesive band 30 is not an essential configuration, and may be provided only on one reinforcing rib 15b side or on both sides of the pair of reinforcing ribs 15a and 15b.

  In the present embodiment, the slit 14 and the pair of reinforcing ribs 15a and 15b are formed in a pinch-off portion formed by biting with a blow mold. That is, the pair of reinforcing ribs 15a and 15b are formed by sandwiching the outer layer body 10 and the inner layer body 20 with a split mold and crushing them flatly. In addition, the slit 14 is formed by cutting out the central area of the bottom of the parison with a split mold and peeling the inner layer body 20 from the outer layer body 10 after blow molding. Here, as a method of peeling the inner layer body 20 from the outer layer body 10, the slit 14 can be easily formed by pressing the pair of reinforcing ribs 15a and 15b toward the mouth wall 13 after blow molding. Can do. At this time, since the reinforcing ribs 15a and 15b are higher in rigidity than the slit 14 portion, the crack of the outer layer body 10 stays at both end portions 14a and 14b of the slit 14 to form the slit 14 having a predetermined length. it can.

  In addition, since the adhesive band 30 is disposed in the vicinity of one of the reinforcing ribs 15b, the reinforcing rib 15b has high adhesiveness, so that it is difficult for cracks to occur. It is difficult to open when squeezing. The pair of biting portions 16a and 16b are provided with pins corresponding to the biting portions 16a and 16b on the surfaces forming the side surfaces of the reinforcing ribs 15a and 15b in the blow mold, and the pins are connected to the reinforcing ribs 15a and 16b. It is formed by biting into the side surface of 15b.

  A pouring cap 40 is attached to the mouth of the double container 1 of the present embodiment by screw engagement. The pouring cap 40 is engaged with and held by the mouth wall 13, and includes a pouring stopper 41 and a lid 43 that is connected to the pouring stopper 41 via a hinge 42 and opens and closes the pouring stopper 41. . In addition, it is good also as a structure which forms the cover body 43 as a different body without providing the hinge 42, and engages the spout 41 with a screw engagement or an undercut engagement.

  The spout 41 is provided with a mounting cylinder 44 that undercuts engagement with the outer peripheral surface of the mouth wall 13, a partition wall 45 that covers the top of the mounting cylinder 44, and an upright side from the partition wall 45. And a pouring tube 46 connected to M. A cylindrical wall 47 is continuous below the dispensing tube 46, and a plurality of vertical ribs 48 provided at intervals in the circumferential direction are provided on the inner peripheral surface of the cylindrical wall 47. A spherical body 49 is disposed inside the vertical rib 48 in the radial direction, and is retained by a bulging portion provided at the upper end of the vertical rib 48. In the lower part of the cylindrical wall 47, an inclined wall 47a that is reduced in diameter downward is provided. Here, the spherical body 49 moves by its own weight along the vertical rib 48, and when the double container 1 is in the standing posture as shown in FIG. 1, it contacts the inclined wall 47a over the entire circumference. The filling space M of the inner layer body 20 is sealed.

  The lid body 43 is obtained by connecting a peripheral wall 51 to the outer edge portion of the top wall 50 covering the top of the spout 41, and the peripheral wall 51 is connected to the mounting cylinder 44 by a hinge 42. In addition, a seal cylinder 52 that is in liquid-tight contact with the dispensing cylinder 46 is provided on the lower surface of the top wall 50. In addition, a pin 53 extending downward is provided on the radially inner side of the seal cylinder 52. The pin 53 is provided so as to come into contact with the spherical body 49 before reaching the upper limit when the spherical body 49 is displaced upward. Thereby, even if the spherical body 49 moves vigorously upward by transportation or the like, it does not come off beyond the bulging portion provided at the upper end of the vertical rib 48.

  When discharging the contents from the double container 1 equipped with the dispensing cap 40, the spherical body 49 is moved to the dispensing cylinder 46 side by opening the lid 43 and tilting or inverting the double container 1. The content in the filling space M is displaced, and is discharged from the dispensing cylinder 46 through the gap between the vertical ribs 48 from the opening of the inclined wall 47a by its own weight. At this time, since outside air is introduced between the outer layer body 10 and the inner layer body 20 through the slit 14, only the inner layer body 20 is reduced in volume while maintaining the shape of the outer layer body 10.

  When the discharge of the contents progresses and the remaining amount decreases, the weight of the entire contents decreases, so that it becomes difficult to discharge the contents only by tilting the double container 1. Therefore, the outer layer body 10 is pressed (squeezed) so as to sandwich the side wall 12 from both sides. At this time, although the slit 14 is slightly opened, the opening amount is limited by the pair of reinforcing ribs 15a and 15b. Therefore, the amount of air leaked from the slit 14 between the outer layer body 10 and the inner layer body 20 is as follows. Since the inner layer body 20 is sufficiently pressed, the content that is difficult to be discharged by its own weight can be discharged to the end. When the pressure is released, the outer layer body 10 is restored by its rigidity, and the outside air is sufficiently introduced between the outer layer body 10 and the inner layer body 20 through the slit 14. In addition, in the double container 1 of this embodiment, it is also possible to squeeze the outer layer body 10 from the beginning and discharge the contents depending on the application.

  As described above, the slit 14 introduces outside air between the outer layer body 10 and the inner layer body 20, but if the length of the slit 14 is too short, the opening length of the slit 14 is insufficient. On the other hand, if the length of the slit 14 is too long, the slit 14 can be easily opened as will be described later, and even if the outer layer body 10 is squeezed, air leaks and the inner layer body 20 is sufficient. Therefore, it becomes difficult to discharge the contents. For this reason, in order to satisfy both of these contradictory functions, the length of the slit 14 is set to an appropriate length according to the rigidity of the outer layer body 10 and formed so as to have the expected length. It is important to.

  In the double container 1 of the present embodiment, the reinforcing ribs 15a and 15b having a thickness T of 2.5 mm or more and 3.5 mm or less are provided on both sides of the slit 14, thereby providing both end portions 14 a of the slit 14, The strength of 14b can be increased and cracks can be prevented from developing from both end portions 14a and 14b of the slit 14 during molding and also during repeated use. Thereby, the length of the slit 14 as the outside air introduction hole can be formed to an expected length. As a result, the content can be discharged by its own weight, and when the remaining amount of the content decreases, smooth discharge by squeezing the outer layer body 10 can be realized. Further, since an outside air introduction valve is not required, the cost is not increased.

  In addition, when the thickness T of the reinforcing ribs 15a and 15b is less than 2.5 mm, sufficient rigidity cannot be obtained. For example, due to molding variations such as a pressing force of a mold or a peeling process, and when repeatedly used, If cracks develop from both end portions 14a, 14b of the slit 14 to the reinforcing ribs 15a, 15b, the slit 14 may be longer than the expected length. Further, if the thickness T exceeds 3.5 mm, air may enter the reinforcing ribs 15a and 15b during molding, and a hollow portion may be formed. From such a viewpoint, the thickness T of the reinforcing ribs 15a and 15b is set to 2.5 mm to 3.5 mm, and more preferably about 3 mm. When the thickness T of the reinforcing ribs 15a and 15b is 2.5 mm or more and 3.5 mm or less, cracks do not develop in the reinforcing ribs 15a and 15b, and the length of the slit 14 is maintained at an expected length. In addition, it is possible to prevent the hollow portion from being formed inside the reinforcing ribs 15a and 15b.

  Further, in the double container 1 of the present embodiment, by providing the biting portions 16a and 16b in the respective reinforcing ribs 15a and 15b, the area of the crimping surface in the reinforcing ribs 15a and 15b is increased, and the friction force Can be used to increase the bottom crack strength of the reinforcing ribs 15a and 15b. Thereby, it can prevent more reliably that a crack progresses from the slit 14 to the reinforcement ribs 15a and 15b. Further, in each of the reinforcing ribs 15a and 15b, the biting portion 16a located on the radially inner side and the biting portion 16b located on the radially outer side are configured so that the biting directions oppose each other, whereby the reinforcing rib 15a, The bottom crack strength of the crimping surface at 15b can be further increased.

  In the double container 1 of the present embodiment, the adhesive band 30 is provided in the vicinity of the one reinforcing rib 15b, so that the reinforcing rib 15b on the side where the adhesive band 30 is provided has high adhesion. Therefore, generation | occurrence | production and progress of a crack can be prevented and the effect which sets the slit 14 to desired length can be heightened.

  Although the present invention has been described based on the illustrated examples, the present invention is not limited to the above-described embodiment, and can be appropriately changed within the scope of the claims, for example, the mouth wall 13. It is also possible to provide a structure in which the pour cap is undercut engaged not by screw engagement, but by providing an engagement protrusion for stopper. Further, the shape of the reinforcing ribs 15a and 15b is not limited to the illustrated example, and dimensions such as the rib height and width can be changed as necessary. Further, the number, position, angle, and shape of the biting portions 16a and 16b Etc. can be appropriately changed.

DESCRIPTION OF SYMBOLS 1 Double container 10 Outer layer body 11 Bottom wall 12 Side wall 13 Mouth wall 14 Slit 14a, 14b End part of slit 15a, 15b Reinforcement rib 16a, 16b Biting-in part 20 Inner layer body 30 Adhesive band 40 Outlet cap 41 Outlet plug 42 Hinge 43 Lid 44 Installation cylinder 45 Bulkhead 46 Extraction cylinder 47 Cylindrical wall 47a Inclined wall 48 Vertical rib 49 Spherical body 50 Top wall 51 Peripheral wall 52 Seal cylinder 53 Pin C Center axis of container L Extension line along slit M Filling space T Reinforcement rib thickness

Claims (3)

In a double container comprising an outer layer body that forms a bottle shape having a mouth part, a body part, and a bottom part, and that forms an outer shell of the container, and an inner layer body that can be reduced in volume and stored inside the outer layer body,
A pinch-off portion formed in the bottom portion by cutting with a blow molding die has a linear slit that penetrates the outer layer body, and extends outside the both ends of the slit along an extension line of the slit. A pair of existing reinforcing ribs,
The double container is characterized in that a thickness of the pair of reinforcing ribs is in a range of 2.5 mm to 3.5 mm.   2. The double container according to claim 1, wherein at least one biting portion is formed in at least one reinforcing rib of the pair of reinforcing ribs so as to bite from one side surface to the other side surface.   The double container according to claim 2, wherein a pair of the biting portions provided so that the biting directions oppose each other are formed on at least one of the pair of reinforcing ribs.

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