JP6656763B2 - Thin-walled container - Google Patents

Description

  The present invention relates to a thin-walled container.

  2. Description of the Related Art Conventionally, a synthetic resin container has been widely used as a container for storing contents such as liquid or powdery or granular solids.

  In recent years, with respect to this type of container, from the viewpoint of reducing the burden on the environment, it has been required to reduce the amount of resin used in the container, and therefore, a container having a reduced thickness. Has been proposed (see Patent Document 1).

JP 2001-225829 A

  However, since the strength of the container body is reduced by reducing the thickness of the container, the container is bent by its own weight when it is self-supported with the contents filled, and the nozzle is used when it is used with a push-down type pump dispenser. There is a possibility that buckling deformation may occur due to the pressing force when the head is pressed down.

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

The present invention has been made to solve the above problems, and a thin-walled container of the present invention has a cylindrical mouth, a body located below the mouth, and a lower end of the body closed. An outer layer body having a bottom portion to be provided, a flexible inner layer body provided inside the outer layer body, and a plurality of vertical band-shaped adhesive bands joining the outer layer body and the inner layer body,
In the mouth, a through-hole is formed which communicates with a reinforcing portion forming region sandwiched between the two adhesive bands circumferentially adjacent between the outer layer body and the inner layer body,
The body portion has an annular folded portion capable of closing an air flow path from the through hole to the reinforcing portion forming region by being folded back together with the inner layer body.

  Further, in the thin container of the present invention, the folded portion may be constituted by a pair of annular walls opposed to each other in a 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 has a plurality of the through holes evenly arranged in the circumferential direction of the mouth, and the circumferential portion corresponding to each through hole has the through hole. It is preferable that a reinforcing portion forming region is provided.

  Further, in the thin container of the present invention, it is preferable that the folded portion extends obliquely downward toward the outside in the radial direction in the folded state.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the thin-walled container which can aim at compatibility of 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 partial cross section. (A) is a top view of the thin container of FIG. 1, and (b) is a front view showing the folded portion of the thin container of FIG. 1 in a folded state. FIG. 3A is a front view of a thin container according to another embodiment of the present invention, and FIG. 3B is a front view showing a state where a folded portion of the thin container in FIG.

  Hereinafter, the present invention will be specifically described with reference to the drawings. In the specification, claims and abstract of the present application, the mouth side of a thin-walled container is referred to as “upper”, and the bottom side is referred to as “downward”.

  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 body portion 3 located below the mouth portion 2, and a body portion. It has a bottom part 4 for closing the lower end of the part 3 and includes an outer layer body 1a forming an outer shell of the container, and an inner layer body 1b arranged inside the outer layer body 1a. The inner layer body 1b has flexibility, and the inside thereof is a storage space S for contents. The contents can be, for example, shampoos and rinses, detergents, deodorant sterilizers, cosmetics, foods, and the like, but are not particularly limited to solids such as powders and granules as well as liquids. It is also possible to use

  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 for joining the outer layer body 1a and the inner layer body 1b to each other. The thin container 1 of the present embodiment is provided with six adhesive bands 1c that are evenly arranged in the circumferential direction. Each of the adhesive bands 1c extends linearly in the vertical direction from the mouth 2 to the bottom 4 so as to be parallel to the central axis C. Note that the adhesive band 1c does not necessarily have to be linear, but may be curved or bent, and the number, arrangement, and width of the adhesive band 1c can be changed as appropriate. It is conceivable to use a maleic acid-modified polyolefin or the like as the adhesive band, but the present invention is not limited to this, and it is sufficient that 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. In the mouth 2, a through hole 2b penetrating the outer layer body 1a is formed. As shown in the plan view of FIG. 2A, in this embodiment, the through-holes 2 b are equally arranged at six places at intervals in the circumferential direction of the mouth 2, but are not limited thereto. Instead, the number and arrangement of the through holes 2b can be appropriately changed.

  On the upper part of the body 3, there is provided a folded portion 5 formed so as to be able to be folded together with the inner layer body 1 b. Here, the thin container 1 shown in FIG. 1 and FIG. 2A shows an unfolded state before the folding part 5 is folded after blow molding, and the thin container 1 in FIG. 5 shows a folded state after folding 5. The folded portion 5 has a pair of annular walls 5a and 5b opposed to each other in a folded state shown in FIG. 2B, and a hinge portion 5c connecting 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 2 side, a lower annular wall 5b located on the bottom 4 side, and an upper annular wall 5a. An annular hinge portion 5c is provided at the boundary with the side annular wall 5b. In the present embodiment, in the folded state shown in FIG. 2B, the folded portion 5 extends obliquely upward toward the outside in the radial direction.

  The folded portion 5 pushes down the mouth portion 2 from the deployed state shown in FIG. 1 while maintaining the shape of the lower annular wall 5b, and the upper annular wall 5a and the inner layer body 1b start from the hinge portion 5c. By folding inward, a folded state as shown in FIG.

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

  In the present embodiment, as shown in the plan view of FIG. 2A, the reinforcing portion forming regions 6 are equally arranged at six locations at intervals in the circumferential direction. It is arranged in accordance with the circumferential position of the through hole 2b. With such a configuration, air can be smoothly introduced from the through hole 2b into the reinforcing portion forming region 6.

  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 (to the accommodation space S side) except for the adhesive band 1c, and the reinforcing portion is formed. 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 to feed air or a method of sucking air in the housing space S from the upper opening of the mouth 2 Thus, the space on the pillar may be formed by contracting the inner layer body 1b by setting the accommodation space S in a negative pressure state.

  When the folded portion 5 is folded in a state where the air enters 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 the air is sealed becomes a columnar shape. 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 is improved. Buckling strength can be increased.

  The bottom 4 has an annular outer edge 4a serving as a ground contact surface, and a recess 4b which is recessed upward on the radial inside of the outer edge 4a. In addition, the bottom 4 is provided with a pinch-off portion 4c formed by cutting off with a split mold of blow molding. The pinch-off portion 4c is provided with a reinforcing rib 4d formed by sandwiching the outer layer body 1a and the inner layer body 1b between the pair of opposing split molds and flattening the same. Further, the reinforcing rib 4d is formed with a biting portion 4e that is bitten from one side surface to the other side surface.

  By providing such a reinforcing rib 4d, the strength of the bottom 4 at the parting line can be increased, and the effect of preventing bottom cracks can be enhanced. Further, by providing the bite portion 4e, it is possible to further improve the bottom crack preventing effect.

  In the present invention, the reinforcing ribs 4d and the biting portions 4e are not essential components, and the shape, number, and position of the reinforcing ribs 4d, and the shape, number, position, and biting direction of the biting portions 4e are particularly limited. It is not something to be done.

  Here, the thin container 1 is formed by direct blow molding of an extruded cylindrical laminated parison including 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 swell and deform the entire body portion 3, and then sandwiched by a split metal mold to form a pinch-off portion 4 c. be able to. The thin container 1 is formed by a biaxial stretching blow molding of a preform formed into a laminated structure of 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 by injection molding. It may be configured to be formed by molding. Note that the thin-walled container 1 of the present embodiment may be a laminated peeling container (delamid container). In this case, by disposing a coating layer that is peelably laminated with the inner layer body 1b on the inner surface of the inner layer body 1b, It can be a delami container. In that case, an outside air introduction hole for introducing outside air into the space between the inner layer body 1b and the coating layer is formed in the mouth portion 2 or the like. As the layer configuration, 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 the possible outer layer body 1a and the coating layer, polypropylene, medium density polyethylene, high density polyethylene, polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, cyclic polyolefin (COC, COP), and the like can be selected. The inner layer body 1b can be formed as a delami container as long as it 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. In addition, even in the form of the thin-walled container 1 which is not the delami container, it can be formed by using the resin shown above for the outer layer body 1a and the inner layer body 1b.

  Hereinafter, an example of a method of discharging a liquid content using the thin container 1 will be described. Note that the thin container 1 of the present embodiment has a state in which air is introduced from the through hole 2b into the reinforcing portion forming region 6 after the blow molding, and the folded portion 5 is folded to form the hollow reinforcing portion 7, 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 type pump dispenser 8 shown by a two-dot chain line in FIG. The pump dispenser 8 includes, for example, a mounting tube screwed to the outer peripheral side of the mouth portion 2, a pump portion hanging down from the mounting tube and disposed on the inner peripheral side of the mouth portion 2, and a lower end extending downward from the pump portion. A suction pipe disposed near the bottom 4 of the thin-walled container 1 and a nozzle head provided at an upper end of an upwardly biased stem protruding above the pump section. it can. In this case, the pump mechanism in the pump unit is driven by the repeated depression and restoration of the nozzle head, and the liquid content in the storage space S is sucked up through the suction pipe and discharged from the nozzle tip of the nozzle head. be able to.

  In the upright posture shown in FIG. 2B, the center axis C extends in the vertical direction, and the nozzle head of the pump dispenser 8 is pushed down along the center axis C in the vertical direction. Therefore, 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, since the buckling strength of the body portion 3 is sufficiently ensured by the hollow reinforcing portion 7 filled with air, the buckling deformation due to the pressing force when the nozzle head is pushed down is reduced. Generation can be prevented.

  When the thin-walled container 1 is discarded after use, the mouth portion 2 is pulled up from the folded state shown in FIG. 2 (b) to the expanded state shown in FIG. By discharging the air from the through-hole 2b, the thin-walled container 1 can be crushed to facilitate disposal. 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 work of discarding the thin container 1 is easy.

  As described above, in the thin container 1 according to the present embodiment, the strength of the body 3 is enhanced by providing the hollow reinforcement 7 in which the air is sealed in the reinforcement forming area 6 in the body 3. Therefore, according to the thin container 1 according to the present embodiment, even when the body 3 is thinned in order to reduce the amount of resin used for the container, the strength of the body 3 is ensured by the hollow reinforcing portion 7. Bends by its own weight when the thin-walled container 1 is self-supported with the contents filled therein, or buckles due to being unable to withstand pressure from above when the nozzle head of the pump dispenser 8 is pressed down. Can be suppressed. That is, according to the thin container 1 according to the present embodiment, it is possible to achieve both thinning of the container and securing of the strength of the body 3.

  Moreover, in the thin container 1 of the present embodiment, the hollow reinforcing portion 7 extends over the entire height of the body portion 3, so that the body portion 3 can be reinforced over the entire height.

  Moreover, in the thin-walled container 1 of the present embodiment, since the hollow reinforcing portions 7 are provided at a plurality of locations, the strength of the body portion 3 is increased as compared with the case where the hollow reinforcing portions 7 are provided alone, and deformation is suppressed. The effect can be improved.

  Further, in the thin-walled container 1 of the present embodiment, the plurality of hollow reinforcing portions 7 are evenly arranged in the circumferential direction. As a result, the trunk 3 is reinforced in the circumferential direction with a good balance, so that it is difficult for the external force applied to the trunk 3 to concentrate on a specific location in the circumferential direction, and as a result, the deformation suppressing effect of the trunk 3 is enhanced. be able to.

  In the thin container 1 of the present embodiment, the hollow reinforcing portion 7 is formed by deforming the inner layer 1b toward the accommodation space S (inside the thin container 1) while maintaining the shape of the outer layer 1a. are doing. Thereby, since the hollow reinforcing portion 7 does not affect the external shape of the thin container 1, the body portion 3 can be reinforced without impairing the external appearance.

  Further, in the thin container 1 of the present embodiment, the hollow reinforcing portion 7 is formed by filling air into the reinforcing portion forming region 6 after blow molding, not in the process of blow molding. Thus, the hollow reinforcing portion 7 can be provided at an arbitrary position regardless of the split position of the blow molding die. Therefore, it becomes easy to arrange a plurality of hollow reinforcing parts 7 in the circumferential direction around the trunk 3.

Hereinafter, another embodiment of the present invention will be described. The same or corresponding components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

  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 annular wall 15 b. An annular hinge 15c connecting the annular wall 15a and the lower annular wall 15b. As shown in FIG. 3A, an auxiliary hinge portion 15d is provided at a boundary portion of the lower annular wall 15b to the body portion 3.

  The folded portion 15 of the present embodiment pushes down the mouth portion 2 from the unfolded state shown in FIG. 3A, and starts from the hinge portion 15c and the auxiliary hinge portion 15d while maintaining the shape of the upper annular wall 15a. 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 outside in the radial direction. With such a configuration, since water droplets attached to the upper annular wall 15a of the folded portion 15 flow downward, even when used around water such as a bathroom or a hand washing place, for example, The liquid does not accumulate on the surface and can be used in a clean state at all times.

  What has been described above merely shows one embodiment of the present invention, and it goes without saying that various changes may be made within the scope of the claims. For example, in the above embodiment, the discharge device such as the pump dispenser 8 is mounted using the male screw 2a of the mouth portion 2. However, the present invention is not limited to this. For example, unevenness is provided on the outer peripheral surface of the mouth portion 2. In addition, a configuration may be adopted in which the mounting cylinder of the ejection tool having the corresponding unevenness is undercut engaged by tapping or the like. Further, in the above embodiment, it has been described that it is formed by extrusion blow molding using an extruded cylindrical parison. However, the present invention is not limited to this. For example, biaxial stretching using a preform preformed by injection molding It may be formed by blow molding. Further, the thin-walled container of the present invention can also be used as a container not equipped with a discharge tool such as the pump dispenser 8, and can be used as a container for refilling, for example, refilling contents into the container. is there. In addition, the body 3 in the above embodiment has a cylindrical shape with a circular cross section, but is not limited to this. For example, a cylindrical shape with a cross section of an ellipse or a polygon may be used. Good.

DESCRIPTION OF SYMBOLS 1 Thin container 1a Outer layer body 1b Inner layer body 1c Adhesive band 2 Mouth 2a Male screw 2b Through hole 3 Trunk 4 Bottom 4a Outer edge 4b Depression 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 line S accommodation space

Claims (4)

An outer layer body having a cylindrical mouth, a body located below the mouth, and a bottom for closing a lower end of the body, and a flexible inner layer provided inside the outer layer And, a plurality of vertical band-shaped adhesive bands for joining the outer layer body and the inner layer body,
In the mouth, a through-hole is formed which communicates with a reinforcing portion forming region sandwiched between the two adhesive bands circumferentially adjacent between the outer layer body and the inner layer body,
A thin-walled container, wherein the body has an annular fold that can be closed together with the inner layer body to close an air flow path from the through hole to the reinforcing portion formation region.   The thin-walled container according to claim 1, wherein the folded portion includes a pair of annular walls that are arranged to face each other in a folded state, and an annular hinge portion that connects the pair of annular walls.   The said mouth part has the said several through-hole uniformly arrange | positioned in the circumferential direction of this mouth part, The said reinforcement part formation area | region is provided in the circumferential direction position corresponding to each through-hole. 3. The thin container according to 1 or 2.   The thin-walled container according to any one of claims 1 to 3, wherein the folded portion extends obliquely downward toward the outside in the radial direction in the folded state.

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