JP6553363B2 - Double container - Google Patents

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 containers for storing cosmetics such as lotions, shampoos, rinses, liquid soaps, food seasonings, etc., an outer layer body forming the outer shell of the container and a volume-reducible deformable housed inside the outer layer body A double container (de-laminate) in which only the inner layer is reduced in volume with the discharge of contents by providing an opening for introducing outside air communicating with the inner layer in the outer layer. 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) and the like. 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, the container using the weight of the contents has a simple structure and no need for an outside air introduction valve, which is excellent in cost reduction.

  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. When forming by blow molding, the pinch-off part formed in the bottom part by biting off with a blow molding split mold can be used as it is as an external air introduction hole. That is, the inner layer can be separated from the outer layer by breaking the bottom wall of the outer layer at the pinch-off portion, and a slit-like outside air introduction hole can be provided at the pinch-off portion.

JP 2008-207860 A

  By the way, when providing a slit-like outside air introduction hole in the pinch off portion as described above, the opening width of the outside air introduction hole is formed in the portion where the inner layer body is separated from the outer layer body in the pinch off portion after molding Corresponds to the thickness of the inner layer body. Here, in the blow molding of the container, when the cylindrical parison is cut off at the pinch-off portion of the mold, if the parison P is cut in an inclined state as shown in FIG. As shown in b), the thickness T of the inner layer 20 at the cut surface is larger than when the parison P is cut at an appropriate angle, and as a result, the opening width of the formed outdoor air introduction hole is as expected There was a problem that it would become larger than it did.

  In addition, for example, in the case where a reinforcing rib is provided at a position adjacent to the outside air introduction hole in the pinch-off portion, and the biting portion is formed from one side surface to the other side surface of the rib, the mold When closing the pin, the parison may be inclined by being pushed by the pin for forming the biting portion. Also in this case, the opening width of the outside air introduction hole becomes large as described above.

  And when the opening width of the outside air introduction hole becomes large as described above, even if the outer layer body is squeezed to take out the contents that could not be discharged by its own weight, the mutual relationship between the outer layer body and the inner layer body The air in between leaks from the outside air introduction hole, and the inner layer body cannot be sufficiently reduced in volume, which makes it difficult to discharge the contents. For this reason, a new double container which improved this point was desired.

  An object of the present invention is to solve such a conventional problem, and an object thereof is to introduce outside air provided in a pinch-off portion in a double container capable of discharging contents by its own weight. The purpose is to propose a double container in which the opening width of the hole is formed to an appropriate size and the smooth discharge by the squeeze of the outer layer is realized.

The present invention has been made to solve the above-mentioned problems, and the double container of the present invention has a bottle-like shape having a mouth, a body and a bottom, and an outer layer body forming an outer shell of the container; And a volume-deformable inner layer body housed inside the outer layer body,
In the double container having a linear slit that penetrates the outer layer body in the pinch-off part formed in the bottom by biting by a blow mold split mold,
The bottom portion has a pair of sandwiching recesses that are concave toward the mouth side and are disposed so as to sandwich at least a central region in the extending direction of the slit from both sides of the slit. .

  In the double container of the present invention, each of the pair of sandwiching recesses has an inner plane that extends parallel to the slit and parallel to the central axis direction of the container. It is preferable to sandwich the slit from both sides.

  Further, in the double container of the present invention, the bottom portion has a pair of reinforcing ribs extending along the extension line of the slit on the outer side of both ends in the extending direction of the slit in the pinch-off portion. It is preferable to provide.

  According to the present invention, in a double container in which contents can be discharged by its own weight, the opening width of the outside air introduction hole provided in the pinch-off portion is formed to an appropriate size, and smooth discharge by squeezing the outer layer body It is possible to provide a double container that realizes the above.

It is the front view which showed the double container which concerns on one Embodiment of this invention in the partial cross section. (A) is a side view of the double container in FIG. 1, (b) is a bottom view of the double container shown in FIG. (A) is sectional drawing which shows the metal mold | die for shape | molding the double container shown in FIG. 1, (b) is a figure showing a mode that a parison is cut | disconnected with the metal mold | die of Fig.3 (a). . (A) is sectional drawing which shows the relationship between a parison and a metal mold | die in the manufacture process of the double container as a reference example, (b) is a parison shown for the comparison with FIG. 4 (a). It is sectional drawing which shows the relationship between and a metal mold | die.

  Hereinafter, the present invention will be described in more detail with reference to the drawings. FIG. 1 is a front view partially showing in cross section 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 the present embodiment includes the outer layer body 10 made of synthetic resin, the inner layer body 20 formed of a synthetic resin having low compatibility with the outer layer body 10, the outer layer body 10 and the inner layer body A band-like adhesive layer formed of a synthetic resin having adhesiveness to 20, that is, one obtained by laminating the adhesive bands 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) which comprises the outer-layer body 10 of this embodiment is provided in order 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 connected to the upper portion of the side wall 12 and having a cylindrical shape and forming a mouth 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 a cylindrical shape whose diameter decreases toward the mouth wall 13, but is not limited thereto, and for example, the cross section has a polygonal shape, an oval shape, or the like. It can be in the form of The mouth wall 13 is provided with a screw portion 13a for mounting a lid or the like.

  As shown in FIG. 1 and FIGS. 2 (a) and 2 (b), the bottom wall 11 is concave toward the mouth wall 13 at the inner side in the radial direction of the annular outer edge 11a to be the ground contact surface and the outer edge 11a. And the recess 11b. In the central region of the recess 11b, a slit 14 is formed as an outside air introduction hole that penetrates the inside and outside of the outer layer body 10 and extends linearly.

  Further, in the recess 11 b of the bottom wall 11, a pair of sandwiching recesses 17 that are recessed toward the mouth wall 13 are formed so as to sandwich the central region in the extension direction of the slit 14 from both sides Yes. As shown in FIG. 2A, the depth of the pair of sandwiching recesses 17 gradually increases from the radially outer side to the inner side. Further, as shown in FIG. 2B, the pair of sandwiching concave portions 17 is substantially semicircular in a plan view, and has a line contrast shape with respect to a straight line L extending the slit 14.

  In the present embodiment, each of the pair of sandwiching recesses 17 has an inner plane 17a extending in parallel to the slit 14 and parallel to the central axis C direction of the container. It has a configuration of sandwiching. In the present invention, the shape of the pair of sandwiching recesses 17 is not particularly limited, and is not necessarily a line-contrast shape in plan view as long as the shape sandwiches the central region in the extending direction of the slit 14. .

  Further, a pair of reinforcing ribs 15 a and 15 b extending along the extension line L of the slit 14 is provided on the outside of the both end portions 14 a and 14 b of the slit 14. Here, 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. Further, the slit 14 is formed by cutting out the central area of the bottom of the parison with a split mold, splitting the bottom wall 11 of the outer layer body 10 after blow molding, and peeling the inner layer body 20 from the outer layer body 10.

  Here, in the present embodiment, since the pair of sandwiching recesses 17 are provided on both sides of the slit 14, as shown in FIG. 3A, in the blow molding split die 18, the sandwiching recesses 17 are formed. Correspondingly shaped sandwiching projections 19 are provided. Each sandwiching projection 19 has an inner flat surface 19 a corresponding to the inner flat surface 17 a of the sandwiching recess 17. When the mold 18 is closed during the molding process, the outer surface of the parison P is sandwiched from both sides by the inner flat surface 19a of the sandwiching protrusion 19 as shown in FIG. As a result, since the inclination of the parison P can be corrected at the time of mold clamping and cutting can be performed at an appropriate angle, the thickness of the inner layer body 20 at the cut surface of the pinch-off portion becomes as expected. As a result, the opening width of the slit 14 formed by peeling the inner layer body 20 from the outer layer body 10 can be formed to a desired size.

  For example, when the reinforcing ribs 15a and 15b are provided with a reinforcing biting portion that bites into the other side from the side surface on one side, the pin for biting portion formation is provided on the mold, Even if the parison P is inclined by being pushed by the pin, since the inclination of the parison P is corrected by the pinching projections 19 at least in the central region of the slit 14, the opening width of the slit 14 is formed to a desired size. can do. Here, since the opening width of the slit 14 is easily expanded in the central region in the extension direction of the slit 14, the sandwiching recess 17 in the present invention is configured to sandwich at least the central region of the slit 14. The length is not particularly limited. For example, the length may be longer than the length of the slit 14. Further, in order to correct the posture of the parison P more effectively, the inner flat surface 17a of the sandwiching recess 17 corresponding to the inner flat surface 19a of the sandwiching protrusion 19 is parallel to the slit 14 and parallel to the central axis C of the container. It is preferred to extend.

  As a method of splitting the bottom wall 11 of the outer layer body 10 after blow molding and forming the slit 14, there is a method of pressing the pair of reinforcing ribs 15a and 15b toward the mouth wall 13 side. The slit 14 can be formed by splitting the bottom wall 11 of the outer layer body 10 and peeling the inner layer body 20 from the outer layer body 10. At this time, since the reinforcing ribs 15a and 15b have higher rigidity than the portion of the slit 14, the cracks of the outer layer body 10 to be the slit 14 are at the both ends 14a and 14b of the slit 14 which is the root of the reinforcing ribs 15a and 15b. It is possible to form a slit 14 having a desired length. In the present invention, the reinforcing ribs 15a and 15b are not essential components, and the shape, number, and position thereof 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 die 18, and the bottom wall 11 of the adhesive band 30. The end portion on the side overlaps 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 extending linearly, and may have a bending portion or a bending 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, by providing the adhesive band 30 in the vicinity of one of the reinforcing ribs 15b, the adhesiveness of the reinforcing rib 15b is strengthened, and cracking is less likely to occur. Sometimes it is difficult to open.

  The 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 43 is formed by connecting the peripheral wall 51 to the outer edge portion of the top wall 50 covering the upper side of the pouring spout 41, and the peripheral wall 51 is connected to the mounting cylinder 44 by the hinge 42. Further, on the lower surface of the top wall 50, a seal cylinder 52 in fluid-tight contact with the pouring cylinder 46 is provided. 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 abut on 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 pouring cap 40, the spherical body 49 is placed on the pouring cylinder 46 side by opening the lid 43 and setting the double container 1 in a tilted or inverted posture. 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 proceeds and the remaining amount decreases, the weight of the entire contents decreases, and it is difficult to discharge the contents only by tilting the double container 1. Therefore, the outer layer body 10 is squeezed so as to sandwich the side wall 12 from both sides.

  As described above, the slit 14 introduces outside air between the outer layer body 10 and the inner layer body 20, but when the contents are discharged by squeeze, the slit 14 sufficiently presses the inner layer body 20. In addition, it is preferable that the amount of air leaking from the slit 14 is as small as possible.

  Here, in the double container 1 of the present embodiment, as described above, the opening width of the slit 14 is formed to a desired size as a configuration having the pair of sandwiching recesses 17 on both sides of the slit 14. As a result, the air between the outer layer 10 and the inner layer 20 does not easily leak from the slit 14 during squeeze, and the inner layer 20 is sufficiently pressed, so the contents that are difficult to discharge under its own weight are also included. It can be discharged to the end. When the pressure is released, the outer layer 10 is restored due to its rigidity, and the outside air is sufficiently introduced between the outer layer 10 and the inner layer 20 through the slit 14. Therefore, according to the double container 1 of the present invention, 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 is realized. be able to. Further, since an outside air introduction valve is not required, the cost is not increased. 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.

  Further, in the present embodiment, the reinforcing ribs 15a and 15b are provided on both sides of the slit 14 to increase the strength of the both end portions 14a and 14b of the slit 14, and also at the time of molding and repetitive use. It is possible to prevent the crack from progressing from both end portions 14a and 14b of the slit 14. Thereby, the length of the slit 14 as the outside air introduction hole can be formed to the intended length. As a result, the function of the slit 14 is more effectively exhibited, and smoother discharge of the contents becomes possible.

  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, the generation and propagation of cracks can be prevented, and the effect of setting the slit 14 to a desired length can be enhanced.

  As mentioned above, although demonstrated based on the example of illustration, this invention is not limited to the above-mentioned embodiment, It can change suitably within the statement range of a claim, for example, mouth part wall 13 It is good also as a structure which is provided with the engaging protrusion for stoppers and makes the extraction | pouring cap undercut-engage by a stopper rather than a screw engagement.

1 Double container 10 Outer layer 11 Bottom wall 11a Outer edge (grounding surface)
11b Recess 12 Side wall 13 Mouth portion wall 14 Slit 14a, 14b Slit end 15a, 15b Reinforcing rib 17 Clamping recess 17a Inner plane 18 Split die 19 Clamping projection 20 Inner layer body 30 Adhesive band 40 Injection cap 41 Injection 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 P Parison

Claims (3)

A bottle having a mouth, a body and a bottom, an outer layer forming the outer shell of the container, and a volume-deformable inner layer housed inside the outer layer;
In the double container having a linear slit that penetrates the outer layer body in the pinch-off part formed in the bottom by biting by a blow mold split mold,
The bottom, at least the central region in the extending direction of the slit, which is arranged to hold from both sides of the slit, have a pair of pinching recess is concave toward the opening side,
The bottom wall forming the bottom of the outer layer body has an outer edge portion that becomes a ground contact surface, and a concave portion that is concave toward the mouth side on the radially inner side of the outer edge portion,
The double container , wherein the sandwiching concave portion is formed so as to be concave toward the mouth side in the concave portion of the bottom wall .   The double pair according to claim 1, wherein each of the pair of sandwiching recesses has an inner flat surface parallel to the slit and extending parallel to the central axis of the container, and the inner flat surface sandwiches the slit from both sides. container. The double container according to claim 1 or 2, wherein the bottom portion includes a pair of reinforcing ribs extending along the extension line of the slit at both ends in the extension direction of the slit in the pinch-off portion. .

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