JP6410654B2 - 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 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, it is a container that utilizes the self-weight of such contents, and is 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. In the case of forming a container by blow molding a parison, a pinch-off portion formed at the bottom by biting with a blow molding die is used as it is as an outside air introduction hole. That is, the inner layer body is separated from the outer layer body by splitting the bottom wall of the outer layer body in the pinch-off portion, and a slit-like outside air introduction hole is provided in the pinch-off portion, which is used as the outside air introduction hole.

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.

  An object of the present invention is to solve such a conventional problem, and an object of the present invention is to form a slit-like outside air introduction hole provided in a pinch-off portion with a predetermined length, By maintaining the thickness, 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 can be realized, and the cost can be reduced. A double container that does not cause an increase is proposed.

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,
The rib height of each of the reinforcing ribs is in the range of 4.0 mm or more and 6.0 mm or less.

  In the double container of the present invention, the thickness of the pair of reinforcing ribs is preferably in the range of 2.5 mm to 3.5 mm.

  According to the present invention, the slit-like outside air introduction hole provided in the pinch-off portion is formed to a desired length, and the content can be discharged by its own weight by maintaining the length. When the remaining amount of the object is reduced, it is possible to realize a smooth discharge by squeezing the outer layer body and to provide a double container that does not cause an increase in cost.

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. It is a bottom view of the double container which concerns on other embodiment of this invention. (A) is a figure which shows the mode of 1st experiment, (b) is a figure which shows the mode of 2nd experiment, (c) is a figure which shows the mode of 3rd experiment.

  Hereinafter, the present invention will be described in more detail with reference to the drawings. FIG. 1 is a front view of a bottle-shaped 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 this embodiment, the outer layer body 10 has a two-layer structure of an outer low density polyethylene resin (LDPE) and an inner polypropylene resin (PP), and the inner layer body 20 has an outer ethylene vinyl alcohol. It has a two-layer structure of a copolymer 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 place of the “Admer” (registered trademark), “Modic” (registered trademark) manufactured by Mitsubishi Chemical Corporation or other adhesive resin may be used. Moreover, in this embodiment, in order to provide a squeeze property, the outer layer of the outer layer body 10 is composed of a low density polyethylene resin (LDPE), but a polypropylene resin (PP), a medium density polyethylene resin (MDPE), Alternatively, high-density polyethylene resin (HDPE) can 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. Arbitrary materials can be selected, and each may have a single layer structure or a multilayer structure. As a layer structure of the inner layer body 20, for example, ethylene vinyl alcohol copolymer resin (EVOH), “Modic” (registered trademark), low density polyethylene resin (LDPE) or linear low density polyethylene resin (LLDPE), It is also possible to have a three-layer structure composed of

  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 pair of reinforcing ribs 15a and 15b are symmetrical with respect to the slit 14, and their rib heights H are 4.0 mm or more and 6.0 mm or less, respectively, and are 4.0 mm in this embodiment. Here, the “rib height H” means the maximum value of the length in the direction of the central axis C from the bottom surface of the recess 11b to the tips of the reinforcing ribs 15a and 15b.

  The depth of the recess 11b is set deeper than the rib height H of the reinforcing ribs 15a and 15b, and the tips of the reinforcing ribs 15a and 15b are set so as not to protrude downward from the outer edge portion 11a. . The thickness T of the reinforcing ribs 15a and 15b shown in FIG. 2 is not particularly limited, but is preferably in the range of 2.5 mm to 3.5 mm. 1 mm. Here, “thickness T of the reinforcing rib” means a thickness perpendicular to the extending direction of each reinforcing rib on a plane perpendicular to the central axis C.

  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. 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 of the pair of reinforcing ribs 15a and 15b, or may be provided on both sides. It is not necessary.

  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 fusing them while flattening them. 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. Moreover, it is also possible to increase the bottom cracking strength of the reinforcing ribs 15a and 15b by providing each reinforcing rib 15a and 15b with a pair of biting portions that are bitten from one side surface to the other side surface. is there. Such a biting portion is provided with a pin corresponding to the biting portion on the surface forming the side surface of the reinforcing rib 15a, 15b in the blow mold, and the pin is bited into the side surface of the reinforcing rib 15a, 15b. To form.

  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 rib height H of 4.0 mm or more and 6.0 mm or less are provided on both sides of the slit 14, respectively. It is possible to increase the strength of 14a and 14b, and to prevent cracks 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 and maintained at the 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.

  If the rib height H of the reinforcing ribs 15a and 15b is less than 4.0 mm, the reinforcing ribs 15a and 15b cannot obtain a sufficient area of the fusion surface, and the fusion strength is insufficient. Longer than the expected length of the slit 14 due to cracking of the reinforcing ribs 15a and 15b from the both ends 14a and 14b of the slit 14 due to molding variations such as the crimping force and peeling process of the slit 14 There is a risk of becoming. Further, if the rib height H is more than 6.0 mm, the depth of the concave portion 11b becomes deep, and it may be difficult to form by the pinch-off portion of the mold. From such a viewpoint, the rib height H of the reinforcing ribs 15a and 15b is set to 4.0 mm or more and 6.0 mm or less, and more preferably, the rib height H is set to about 5 mm.

  Furthermore, when the thickness T of the reinforcing ribs 15a and 15b is 2.5 mm or more and 3.5 mm or less, cracks are less likely to propagate in the reinforcing ribs 15a and 15b, and the expected length of the slit 14 is increased. It is easy to maintain the thickness, and the thickness T of the reinforcing ribs 15a and 15b is too thick to prevent a hollow portion from being formed inside.

  Further, 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 a strong adhesive property. Therefore, the occurrence and development of cracks can be prevented, and the effect of setting the slit 14 to a desired length can be enhanced.

  Here, FIG. 3 is a bottom view of the double container 100 according to another embodiment of the present invention, and the shape of the bottom is different from the double container 1 in the previous embodiment. In the bottom wall 11 of the double container 100 of the present embodiment, there are an annular outer edge portion 11a serving as a ground contact surface, and a substantially cross-shaped recessed portion recessed toward the mouth wall 13 on the radial inner side of the outer edge portion 11a. 17 are provided. A slit 14 is formed in the central area of the substantially cross-shaped recess 17 as in the previous embodiment.

  As shown in FIG. 3, the substantially cross-shaped recess 17 is composed of a first direction recess 17a extending along the extending direction of the slit 14 and a second direction recess 17b intersecting the first direction recess 17a. Yes. In the present embodiment, each of the first direction concave portion 17 a and the second direction concave portion 17 b is substantially elliptical in plan view, and each center is located on the central axis C of the double container 1. The first direction recess 17a and the second direction recess 17b have both end portions in the extending direction (the major axis direction of the ellipse) extending to the vicinity of the outer edge portion 11a. Moreover, in this embodiment, it arrange | positions so that the extending direction of the 1st direction recessed part 17a and the 2nd direction recessed part 17b may orthogonally cross. In the present embodiment, the substantially cross-shaped concave portion 17 has a line-contrast shape with respect to the straight line L obtained by extending the slit 14.

  Further, the depths of the first direction recess 17a and the second direction recess 17b from the ground contact surface gradually become deeper from the radially outer side toward the inner side, and become deepest in the central region of the bottom wall 11 where they intersect. A slit 14 is formed in the central region. A pair of reinforcing ribs 15a and 15b having a rib height H of 4.0 mm or more and 6.0 mm or less are provided outside the both ends 14a and 14b of the slit 14.

  In such a double container 100 having the bottom wall 11 having a complicated shape, reinforcing ribs 15a and 15b having a rib height H of 4.0 mm or more and 6.0 mm or less are provided as in the previous embodiment. Thus, the strength of both end portions 14a and 14b of the slit 14 can be increased, and cracks can be prevented from progressing from the both end portions 14a and 14b of the slit 14 even during molding and repeated use. Thereby, the length of the slit 14 as the outside air introduction hole can be formed and maintained at the expected length, and the same effect as the previous embodiment can be obtained. Also in the present embodiment, as in the previous embodiment, the thickness T of the reinforcing ribs 15a and 15b is preferably 2.5 mm or more and 3.5 mm or less.

  Next, an experiment for confirming a difference in strength at the bottom due to a difference in rib height was performed using a double container provided with reinforcing ribs having the same configuration as in FIG. 3 and will be described below.

In this experiment, the container of the present invention in which the rib height of the reinforcing rib is in the range of 4.0 mm to 6.0 mm and the container of the comparative example in which the rib height of the reinforcing rib is less than 4.0 mm are respectively used. The following five types of experiments shown in Table 1 were performed using three each.
In the first experiment, as shown in FIG. 4 (a), a downward pressing force is applied to the bottom of the double container 1 in an inverted posture in which the surface of the upper end of the mouth is grounded, The force at the time of cracking and the amount of displacement in the pressing direction until then were measured.
In the second experiment, as shown in FIG. 4B, the side of the container is grounded so that the extending direction of the reinforcing rib is perpendicular to the grounding surface. A pressing force toward the surface was applied, and the force when the reinforcing rib was broken and the amount of displacement until then were measured.
In the third experiment, as shown in FIG. 4 (c), a force in the pulling direction is applied from both sides in the slit opening direction (direction perpendicular to the reinforcing rib extending direction), and the reinforcing rib is cracked. Force and displacement until then were measured.
In the fourth experiment, each container was dropped five times from a height of 1 m in an environment where the room temperature was 5 ° C., and the presence or absence of cracks in the reinforcing ribs was confirmed.
In the fifth experiment, the contents filled in the container were discharged to the end, and it was confirmed whether or not the reinforcing ribs were cracked. The results of each experiment are shown in Table 1. The result of each experiment has shown each value of the three containers of an Example, and those average values, and each value of the three containers of a comparative example, and those average values.

  The results of each experiment are as shown in Table 1. In any of the tests, the container of the present invention in which the height of the reinforcing rib is 4.0 mm to 6.0 mm is a comparative example in which the height of the reinforcing rib is less than 4.0 mm (3.75 mm or less). The result was that the strength of the bottom was higher than that of the container and it was difficult to break.

  As described above, according to the double container of the present invention, it is possible to prevent cracks from progressing from both ends of the slit even during molding and repeated use by providing a high-strength reinforcing rib. it can. Thereby, the length of the slit as the outside air introduction hole can be formed and maintained at the expected length.

  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 description range of a claim, for example, it is a mouth wall. It is good also as a structure which carries out an undercut engagement of the extraction | pouring cap not by screw engagement but by providing the engagement protrusion for stoppers. Further, the shape of the reinforcing rib is not limited to the illustrated example, and the dimensions such as the width can be changed as necessary.

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 17 Substantially cross-shaped recessed part 17a First direction recessed part 17b Second direction recessed part 20 Inner layer body 30 Adhesive band 40 Outlet cap 41 Outlet plug 42 Hinge 43 Lid body 44 Mounting cylinder 45 Bulkhead 46 Outlet 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 of container Axis line L Extension line along slit M Filling space H Rib height of reinforcing rib T Thickness of reinforcing rib

Claims (2)

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, wherein a height of each of the reinforcing ribs is within a range of 4.0 mm or greater and 6.0 mm or less.   The double container according to claim 1, wherein a thickness of the pair of reinforcing ribs is in a range of 2.5 mm to 3.5 mm.

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