JP2018034854A - Thin-walled container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thin-walled container of which both of wall thinning and assurance for a strength of a shank can be achieved.SOLUTION: A thin-walled container 1 comprises: an outer layer body 1a having a cylindrical mouth 2, a shank 3 positioned below the mouth 2, and a bottom 4 which closes a lower end part of the shank 3; an inner layer body 1b which is provided inside the outer layer body 1a and has flexibility; and plural longitudinal strip-shaped adhesive bands 1c which join the outer layer body 1a and the inner layer body 1b to each other. An open hole 2b, which is communicated with a reinforcement part formation area 6 sandwiched by two adhesive bands 1c which are adjacent to each other between the outer layer body 1a and the inner layer body 1b in a circumferential direction, is formed on the mouth 2, and the shank 3 has an annular folding part 5 which is folded together with the inner layer body 1b thereby enabling to close an air flow passage from the open hole 2b to the reinforcement part formation area 6.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a thin-walled container.

  Conventionally, a synthetic resin container has been widely used as a container for storing contents such as liquid or powdery or granular solid.

  In recent years, in this type of container, it has been required to reduce the amount of resin used in the container from the viewpoint of reducing the burden on the environment, and for this purpose, the container has been made thinner. Has been proposed (see Patent Document 1).

JP 2001-225829 A

  However, since the strength of the container body is reduced by making the container thinner, it can be bent by its own weight when it is self-supported with the contents filled, or when it is used with a push-down pump dispenser. There is a risk of buckling deformation due to the pressing force when the head is pushed down.

  Therefore, an object of the present invention is to provide a thin-walled container capable of achieving both the thinning of the container and the securing of the strength of the trunk.

The present invention has been made to solve the above problems, and the thin container of the present invention has a cylindrical mouth portion, a trunk portion located below the mouth portion, and a lower end portion of the trunk portion. An outer layer body having a bottom portion, a flexible inner layer body provided on the inner side of the outer layer body, and a plurality of vertical belt-like adhesive bands that join the outer layer body and the inner layer body,
In the mouth portion, a through hole communicating with the reinforcing portion forming region sandwiched between the two adhesive bands adjacent in the circumferential direction between the outer layer body and the inner layer body is formed,
The trunk portion includes an annular folded portion that can be folded together with the inner layer body to close an air flow path from the through hole to the reinforcing portion forming region.

  In the thin container according to the present invention, the folded portion may be composed of a pair of annular walls opposed to each other in the folded state and an annular hinge portion connecting the pair of annular walls. preferable.

  Further, in the thin container of the present invention, the mouth portion has a plurality of the through holes arranged uniformly in the circumferential direction of the mouth portion, and the circumferential positions corresponding to the respective through holes. It is preferable that a reinforcing portion forming region is provided.

  Moreover, in the thin container of this invention, it is preferable that the said folding | returning part is extended diagonally downward toward the radial direction outer side in the folding state.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the thin container which can aim at coexistence with thinning of a container and ensuring of the intensity | strength of a trunk | drum.

It is a front view which shows the thin container which is one Embodiment of this invention in a partial cross section. (A) is a top view of the thin container of FIG. 1, (b) is a front view which shows the state which turned up the folding | turning part of the thin container of FIG. (A) is a front view of the thin container which is other embodiment of this invention, (b) is a front view which shows the state which turned up the folding | turning part of the thin container of Fig.3 (a).

  Hereinafter, the present invention will be specifically described with reference to the drawings. In the present specification, claims, and abstract, the mouth side of the thin container is “upper” and the bottom side is “lower”.

  As shown in FIGS. 1 and 2A, a thin container 1 according to an embodiment of the present invention includes a cylindrical mouth portion 2, a cylindrical trunk portion 3 located below the mouth portion 2, and a trunk portion. The outer layer body 1a which has the bottom part 4 which obstruct | occludes the lower end part of the part 3, and forms the outline of a container, and the inner layer body 1b arrange | positioned inside the outer layer body 1a are provided. The inner layer body 1b has flexibility, and the inside is an accommodation space S for contents. The contents can be, for example, shampoos and rinses, detergents, deodorant disinfectants, cosmetics, foods, etc., but are not particularly limited, not only liquids but also solids such as powders and granules It is also possible.

  Here, between the outer layer body 1a and the inner layer body 1b, there are provided a plurality of vertical belt-like adhesive bands 1c that join the outer layer body 1a and the inner layer body 1b together. The thin-walled container 1 of the present embodiment is provided with six adhesive bands 1c that are evenly arranged in the circumferential direction. Further, each of the adhesive bands 1c extends linearly in the vertical direction from the mouth portion 2 to the bottom portion 4 so as to be parallel to the central axis C. The adhesive band 1c does not necessarily have to be linear, and may be curved or bent, and the number, arrangement, and width of the adhesive band 1c can be changed as appropriate. Although it is conceivable to use maleic acid-modified polyolefin or the like as the adhesive band, it is not limited to this, as long as the outer layer body and the inner layer body can be bonded.

  In the present embodiment, a male screw 2 a is provided on the outer peripheral surface of the mouth portion 2. Further, the mouth portion 2 is formed with a through hole 2b that penetrates the outer layer body 1a. As shown in the plan view of FIG. 2 (a), in the present embodiment, the through holes 2b are evenly arranged at six locations at intervals in the circumferential direction of the mouth portion 2. However, the present invention is not limited to this. In addition, the number and arrangement of the through holes 2b can be changed as appropriate.

  On the upper part of the body part 3, a folded part 5 formed so as to be folded together with the inner layer body 1b is provided. Here, the thin container 1 shown in FIG. 1 and FIG. 2 (a) shows a developed state before the folded portion 5 is folded after blow molding, and the thin container 1 in FIG. 2 (b) is the folded portion. A folded state after folding 5 is shown. The folded portion 5 includes a pair of annular walls 5a and 5b that are opposed to each other in the folded state shown in FIG. 2B, and a hinge portion 5c that couples the pair of annular walls 5a and 5b. Specifically, as shown in FIG. 1, the folded portion 5 includes an upper annular wall 5a located on the mouth portion 2 side, a lower annular wall 5b located on the bottom portion 4 side, an upper annular wall 5a and a lower portion. It is comprised with the cyclic | annular hinge part 5c provided in the boundary part with the side annular wall 5b. In the present embodiment, the folded portion 5 extends obliquely upward toward the radially outer side in the folded state shown in FIG.

  From the unfolded state shown in FIG. 1, the folded-back portion 5 keeps the shape of the lower annular wall 5b maintained, pushes down the mouth portion 2 and starts the upper annular wall 5a together with the inner layer body 1b from the hinge portion 5c. By folding inward, a folded state as shown in FIG.

  Here, a region sandwiched between two adhesive bands 1 c adjacent in the circumferential direction between the outer layer body 1 a and the inner layer body 1 b forms a reinforcing portion forming region 6. In the expanded state shown in FIG. 1, the reinforcing portion forming region 6 communicates with the through hole 2 b of the mouth portion 2, that is, communicates with the outside, and in the folded state illustrated in FIG. Since the air flow path to the through hole 2b is blocked, the space is completely closed.

  In the present embodiment, as shown in the plan view of FIG. 2 (a), the reinforcing portion forming regions 6 are evenly arranged at six locations with intervals in the circumferential direction. It arrange | positions according to the circumferential direction position of the through-hole 2b. By setting it as such a structure, air can be smoothly introduce | transduced into the reinforcement part formation area 6 from the through-hole 2b.

  In the unfolded state shown in FIG. 1, when air is introduced from the through hole 2b into the reinforcing portion forming region 6, the inner layer body 1b is deformed inward (toward the accommodation space S) except for the adhesive band 1c, and the reinforcing portion The formation region 6 forms a columnar space. As a method of introducing air from the through hole 2b into the reinforcing portion forming region 6, a method of inserting an air nozzle into the through hole 2b and pumping air, or sucking the air in the accommodation space S from the upper opening of the mouth portion 2 is used. Thus, the inner space 1b may be contracted to form a space on the pillar by making the accommodation space S into a negative pressure state.

  When the folded portion 5 is folded in a state where air has entered the reinforcing portion forming region 6, the air flow path from the reinforcing portion forming region 6 to the through hole 2b is closed, and the reinforcing portion forming region 6 in which air is sealed is formed in a columnar shape. The hollow reinforcing portion 7 is formed. Since the hollow reinforcing portion 7 extends in parallel with the central axis C, that is, in the vertical direction, over the entire height of the body portion 3, the strength against bending of the body portion 3 over the entire height of the body portion 3 The buckling strength can be increased.

  The bottom portion 4 includes an annular outer edge portion 4a that serves as a ground contact surface, and a recess portion 4b that is recessed upward on the radially inner side of the outer edge portion 4a. Further, the bottom portion 4 is provided with a pinch-off portion 4c formed by biting with a blow mold. The pinch-off portion 4c is provided with reinforcing ribs 4d formed by sandwiching the outer layer body 1a and the inner layer body 1b with a pair of opposing molds and crushing them flatly. Further, the reinforcing rib 4d is formed with a biting portion 4e that bites from the side surface on one side toward the side surface on the other side.

  By providing such a reinforcing rib 4d, the strength of the bottom part 4 in the parting line can be increased and the effect of preventing bottom cracks can be increased. Furthermore, the bottom crack prevention effect can be further improved by providing the biting portion 4e.

  In the present invention, the reinforcing rib 4d and the biting portion 4e are not essential, and the shape, number, and position of the reinforcing rib 4d, and the shape, number, position, biting direction, and the like of the biting portion 4e are particularly limited. Is not to be done.

  Here, the thin container 1 directly blow-molds an extruded cylindrical laminated parison having a resin layer forming the outer layer body 1a, a resin layer forming the inner layer body 1b, and a resin layer forming the adhesive band 1c. Can be formed. In this case, the fluid compressed in the process of blow molding is blown from the side of the mouth portion 2 to bulge and deform the entire body portion 3, and then sandwiched by a split mold that is divided into two to form the pinch-off portion 4 c. be able to. The thin-walled container 1 is formed by injection molding a preform formed into a laminated structure of a resin layer that forms the outer layer body 1a, a resin layer that forms the inner layer body 1b, and a resin layer that forms the adhesive band 1c. It is good also as a structure formed by shape | molding. In addition, the thin-walled container 1 of the present embodiment may be a delamination container (a delamination container), and in that case, by disposing a coating layer that is releasably laminated with the inner layer body 1b on the inner surface of the inner layer body 1b, Can be a delamination container. In that case, an outside air introduction hole for introducing outside air into the space between the inner layer body 1b and the covering layer is formed in the mouth 2 or the like. As the layer structure, for example, the outer layer body 1a can be made of low density polyethylene, the inner layer body 1b can be made of an ethylene vinyl alcohol copolymer, and the coating layer can be made of low density polyethylene. In addition, as a possible outer layer body 1a and covering layer, polypropylene, medium density polyethylene, high density polyethylene, polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, cyclic polyolefin (COC, COP), and the like can be selected. Further, the inner layer body 1b can be formed as a delamination container as long as the inner layer body 1b has low compatibility with the outer layer body 1a and the coating layer, such as 6-nylon, 6,6-nylon, and MX nylon, and can be peeled off. Even in the form of the thin container 1 which is not a delamination container, it can be formed by using the resin shown above for the outer layer body 1a and the inner layer body 1b.

  Below, an example of the method of discharging the liquid content using the thin container 1 is demonstrated. In the thin container 1 of the present embodiment, after blow molding, air is introduced from the through hole 2b into the reinforcing portion forming region 6, the folded portion 5 is folded, and the hollow reinforcing portion 7 is formed, that is, FIG. It is used in the state shown in b).

  In the thin container 1 of the present embodiment, for example, a push-down pump dispenser 8 shown by a two-dot chain line in FIG. The pump dispenser 8 includes, for example, a mounting cylinder that is screwed to the outer peripheral side of the mouth part 2, a pump part that is suspended from the mounting cylinder and is disposed on the inner peripheral side of the mouth part 2, and extends downward from the pump part to a lower end. A suction pipe arranged in the vicinity of the bottom 4 of the thin-walled container 1 and a nozzle head provided at the upper end of the upwardly biased stem protruding above the pump part it can. In this case, the pump mechanism in the pump unit is driven by repeatedly pressing down and restoring the nozzle head, and the liquid in the storage space S is sucked up via the suction pipe and discharged from the nozzle tip of the nozzle head. be able to.

  2B, the central axis C extends in the vertical direction, and the nozzle head of the pump dispenser 8 is pushed down along the central axis C in the vertical direction. For this reason, the vertical pressing force applied to the nozzle head is transmitted from the pump dispenser 8 to the body 3 via the mouth 2. In the thin container 1 of the present embodiment, the buckling strength of the body portion 3 is sufficiently ensured by the hollow reinforcing portion 7 filled with air, so that the buckling deformation due to the pressing force when the nozzle head is pushed down is prevented. Occurrence can be prevented.

  When the thin container 1 is discarded after use, the mouth portion 2 is lifted upward from the folded state shown in FIG. 2B to return to the unfolded state shown in FIG. By discharging the air from the through-hole 2b, the thin container 1 can be crushed and easily discarded. That is, since the air in the hollow reinforcing portion 7 can be discharged without cutting the body portion 3 using a cutter or the like, the disposal operation of the thin container 1 is easy.

  As described above, the thin container 1 according to the present embodiment increases the strength of the body portion 3 by providing the body portion 3 with the hollow reinforcement portion 7 in which air is sealed in the reinforcement portion forming region 6. Therefore, according to the thin-walled container 1 according to this embodiment, even when the body 3 is thinned to reduce the amount of resin used in the container, the strength of the body 3 is ensured by the hollow reinforcing portion 7. Can be bent by its own weight when it is self-supported with the contents filled in the thin-walled container 1 or buckled and deformed without being able to withstand the pressure from above when the nozzle head of the pump dispenser 8 is pushed down. Can be suppressed. That is, according to the thin container 1 according to the present embodiment, it is possible to achieve both the thinning of the container and the securing of the strength of the body portion 3.

  Moreover, in the thin container 1 of this embodiment, since the hollow reinforcement part 7 is extended over the whole height of the trunk | drum 3, the trunk | drum 3 can be reinforced over the whole height.

  Moreover, in the thin container 1 of this embodiment, since the hollow reinforcement part 7 is provided in several places, compared with the case where the hollow reinforcement part 7 is provided independently, the intensity | strength of the trunk | drum 3 becomes high and a deformation | transformation suppression is carried out. The effect can be improved.

  Moreover, in the thin container 1 of this embodiment, the several hollow reinforcement part 7 is arrange | positioned equally in the circumferential direction. Thereby, since the trunk | drum 3 is reinforced with sufficient balance in the circumferential direction, it becomes difficult for the external force applied to the trunk | drum 3 to concentrate on the specific location of the circumferential direction, As a result, the deformation | transformation suppression effect of the trunk | drum 3 is improved. be able to.

  Moreover, in the thin container 1 of this embodiment, the hollow reinforcement part 7 is formed when the inner layer body 1b deform | transforms into the accommodation space S side (inside the thin container 1) in the state which maintained the shape of the outer layer body 1a. doing. Thereby, since the hollow reinforcement part 7 does not affect the external appearance shape of the thin container 1, the trunk | drum 3 can be reinforced without impairing an external appearance.

  Moreover, in the thin container 1 of this embodiment, it is set as the structure which encloses air in the reinforcement part formation area 6 and forms the hollow reinforcement part 7 after the blow molding rather than the process of blow molding. Thereby, the hollow reinforcement part 7 can be provided in arbitrary positions irrespective of the split position of a blow molding die. Therefore, it becomes easy to arrange the plurality of hollow reinforcing portions 7 evenly around the trunk portion 3 in the circumferential direction.

Hereinafter, other embodiments of the present invention will be described. In addition, about the structure which is the same as that of 1st Embodiment, or respond | corresponds, it represents with the same code | symbol and abbreviate | omits description.

  As shown in FIGS. 3A and 3B, the folded portion 15 of the thin container 10 includes an upper annular wall 15 a located on the mouth 2 side, a lower annular wall 15 b located on the bottom 4 side, and an upper side And an annular hinge portion 15c that connects the annular wall 15a and the lower annular wall 15b. Moreover, as shown to Fig.3 (a), the auxiliary | assistant hinge part 15d is provided in the boundary part to the trunk | drum 3 of the lower side annular wall 15b.

  The folded portion 15 of the present embodiment starts from the hinge portion 15c and the auxiliary hinge portion 15d while keeping the shape of the upper annular wall 15a pressed down from the unfolded state shown in FIG. 3 (a). By folding the lower annular wall 15b downward, the folded state shown in FIG. 3B is obtained.

  In the thin container 10 of the present embodiment, in the folded state shown in FIG. 3B, the folded portion 15 extends obliquely downward toward the radially outer side. By adopting such a configuration, water droplets attached to the upper annular wall 15a of the folded portion 15 flow downward, so even when used around a water such as a bathroom or a hand washing place, the upper portion of the folded portion 15 Therefore, it can be used in a clean state.

  The above description shows only one embodiment of the present invention, and it goes without saying that various modifications may be made within the scope of the claims. For example, in the previous embodiment, the male screw 2a of the mouth portion 2 is used to attach the discharge tool such as the pump dispenser 8, but the present invention is not limited to this. For example, the outer peripheral surface of the mouth portion 2 is provided with unevenness. And it is good also as a structure which carries out undercut engagement of the mounting | wearing cylinder of the discharge tool which has the unevenness | corrugation corresponding to this by a stopper. Further, in the previous embodiment, it has been described as formed by extrusion blow molding using an extruded cylindrical parison, but is not limited to this, for example, biaxial stretching using a preform that has been injection molded in advance You may form by blow molding. Further, the thin container of the present invention can be used as a container without a discharge device such as the pump dispenser 8, and for example, it can be used as a refill container in which the contents are refilled into the present container. is there. Moreover, although the trunk | drum 3 in previous embodiment is made into the cylindrical shape whose cross section is circular, it is not restricted to this, For example, even if the cross section becomes a cylinder shape which becomes an ellipse or a polygon etc. Good.

DESCRIPTION OF SYMBOLS 1 Thin container 1a Outer layer body 1b Inner layer body 1c Adhesive zone 2 Portion 2a Male screw 2b Through-hole 3 Body part 4 Bottom part 4a Outer edge part 4b Recessed part 4c Pinch off part 4d Reinforcement rib 4e Biting part 5 Folding part 5a Upper annular wall (annular wall)
5b Lower annular wall (annular wall)
5c Hinge part 6 Reinforcement part formation area 7 Hollow reinforcement part 8 Pump dispenser 10 Thin container 15 Folding part 15a Upper annular wall (annular wall)
15b Lower annular wall (annular wall)
15c Hinge part 15d Auxiliary hinge part C Center axis S Storage space

Claims (4)

An outer layer body having a cylindrical mouth part, a body part located below the mouth part, and a bottom part closing the lower end part of the body part, and a flexible inner layer body provided inside the outer layer body And a plurality of longitudinal belt-shaped adhesive bands that join the outer layer body and the inner layer body,
In the mouth portion, a through hole communicating with the reinforcing portion forming region sandwiched between the two adhesive bands adjacent in the circumferential direction between the outer layer body and the inner layer body is formed,
The body portion includes a thin-walled container having an annular folded portion that can be folded together with the inner layer body to close an air flow path from the through hole to the reinforcing portion forming region.   The thin walled container according to claim 1, wherein the folded portion is configured by a pair of annular walls opposed to each other in the folded state and an annular hinge portion connecting the pair of annular walls.   The said mouth part has a plurality of said penetration holes equally arranged in the peripheral direction of this mouth part, and said reinforcement part formation field is provided in the peripheral direction position corresponding to each penetration hole. The thin-walled container according to 1 or 2.   The thin container according to any one of claims 1 to 3, wherein the folded portion extends obliquely downward toward the radially outer side in the folded state.

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