JP2010235125A - Blow-molded thin-walled container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blow-molded thin-walled container suitable for a refilling container, in which a neck part having a thread portion and a body (a storage part) can be integrally manufactured, and the thread portion has the rigidity to withstand threaded engagement with a dispenser. <P>SOLUTION: In the blow-molded thin-walled container, a storage part for defining a filling space of a content is integrally formed with a neck part forming a passage in which the content is dispensed from the storage part by the blow molding. The neck part includes a neck part body having a thread portion on its outer circumferential wall, a fold-in cylindrical part integrally connected to the neck part body, and a push-in cylindrical part integrally connected to the fold-in cylindrical part. By pushing in the push-in cylindrical part, the neck part can be shifted from its initial state in a push-in state in which the fold-in cylindrical part is folded inside the neck part body, and the push-in cylindrical part is fitted inside the folded-in fold-in cylindrical part. A sealing plug forming the spout opening of the content, when being torn along a scheduled breaking line, is provided at a fore end of the push-in cylindrical part. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a thin-walled container formed by blow molding that contains a liquid or the like as a content. For example, the neck portion having rigidity to withstand screwing with a discharge device such as a pump or a screw cap is thin-walled. It is intended to be integrated.

  In recent years, in order to save resources, reduce weight, and reduce waste, there is an increasing number of cases where thin-walled containers such as pouches are used in place of conventional relatively rigid containers. In particular, thin-type containers of this type are actively used for refill products such as detergents and shampoos. In such products, the contents are usually refilled and used in another body, but this refilling work requires time and effort, especially in the case of viscous liquids such as shampoos. It is a cumbersome task for the person.

  A method to reduce the complexity of this refilling work, to make effective use of resources, and to reduce the amount of waste, so that the container is thinned and a device such as a pump is directly attached to the neck. As a prior art regarding this point, a thin container is known in which a container body is formed from a synthetic resin sheet material, and a thick neck member is integrally formed on the upper end of the container body by heat welding. (For example, refer to Patent Document 1).

JP 2001-114274 A

  The above thin-walled container enables the contents to be poured out by screwing a divider into the neck member, and the contents can be simply replaced by replacing the pump without troublesome refilling work. Was accessible.

  The replacement type thin-walled container as described above requires a plurality of constituent members because the container body is formed of a sheet material and a separately formed thick neck must be attached to the container body. Also, because of this, the number of manufacturing processes is large, and there remains a problem in that efficient manufacturing cannot be performed.

  An object of the present invention is to obtain a blow-molded thin-walled container suitable as a replacement container that can be reliably mounted with a discharger such as a pump and can be manufactured efficiently.

  The above-mentioned problem is solved by the blow-molded thin-walled container according to the present invention. According to this, it is a blow-molded thin-walled container integrally formed by blow molding together with a neck portion that forms a path through which the contents are discharged from the housing portion, and the neck portion that forms a filling space for the contents, A neck body having a threaded portion on the outer peripheral wall, a folding cylinder part integrally connected to the upper end part of the neck part body, which can be folded toward the inner side of the neck part body, and a pushing unit integrally connected to the upper end part of the folding cylinder part Further, it is characterized in that a sealing stopper is provided at the tip of the push-in cylinder part to form a content extraction opening by tearing along the planned fracture line.

  Further, the present invention is a thin container having the above-described configuration, wherein the threaded portion of the neck body is made of a thread obtained by forming the wall itself to protrude radially outwardly, Further, it is possible to have a sealed space in which sufficient air is held to hold at least the shape of the screw thread between the folding cylinder and the neck body.

  Further, in the present invention, at least one recess extending in the axial direction can be provided on the outer peripheral wall of the push-in cylinder portion. Further, for the sealing plug, a finger hook portion is provided on the top surface of the sealing plug when the sealing plug is torn off. The pull ring that forms can be connected together.

  Furthermore, this invention can form the lamination | stacking wall part with which the neck part main body, the folding cylinder part, and the pushing cylinder part overlapped by folding the said folding cylinder part toward the inner side of the said neck part main body. .

  The thin-walled container of the present invention can be efficiently manufactured because the steps such as bonding the members can be omitted by integrally forming by blow molding as compared to the one constituted by a plurality of members. Is possible. In addition, the neck portion of this thin-walled multi-layer structure has a three-part configuration of a neck portion main body, a folding tube portion, and a push-in tube portion, and a multi-layer structure in which these overlap each other, so that the neck portion is blown integrally. It is possible to provide rigidity sufficient to withstand screwing with a discharger or the like.

  And, by providing the recess, the pushing cylinder part obtains the rigidity in the vertical direction, so that the wall surface is prevented from being deformed during pushing, and the neck part can be easily shifted from the initial state to the pushing state, In the pushed-in state, the longitudinal rigidity of the entire neck is increased. Further, the pull ring integrally connected to the top surface of the sealing plug has a structure in which a dispensing opening for the discharge device can be obtained in a simple manner while having an integrated structure as a sealed container.

It is a perspective view of the initial state of the neck part 3 in one Example of the blow formation thin wall container of this invention. It is a perspective view of the pushing state of the neck part 3 in the blow-formed thin wall container shown in FIG. It is a partial longitudinal cross-sectional view of the pushing state of the neck part 3 in the blow-formed thin wall container shown in FIG. It is a longitudinal cross-sectional view which shows the state which screwed the discharge device in the blow formation thin wall container shown in FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In order to apply the blow-molded thin container of the present invention to the use of the replacement container, first, from the initial state (FIG. 1) immediately after the container is molded by blow molding, the pushing cylinder part is directed to the bottom of the housing part. The neck is moved to the indented state (FIGS. 2 and 3), and then the contents are filled from the filling port formed at the bottom of the container, and the container is sealed by heat welding or the like. Circulate in this state. At the time of use, the sealing plug of the distribution container is opened by the method described later, and a discharger such as a pump equipped with a nozzle head is attached to the neck (FIG. 4).
Further, the shape of the accommodating portion is not limited, but in this embodiment, a standing type that can stand upright is shown.

  1 to 4, 1 is a thin container, 2 is a storage portion that partitions and forms a filling space for contents, and 3 is a neck portion provided at the upper end of the storage portion 2. The neck portion 3 forms a path for discharging contents from the housing portion 2 inside thereof, and is integrally formed with the housing portion 2 by blow molding.

  The neck 3 includes a cylindrical neck body 4 directly connected to the housing part 2, an integrally connected to the upper end of the neck body 4, and a folding cylinder part 5 that can be folded (reversed) toward the inside of the neck body 4; The push-in tube portion 6 is integrally connected to the upper end of the folding tube portion 5 and is pushed into the bottom portion of the housing portion 2 so as to fold the folding tube portion 5 and bring these walls into close contact with each other. The folding cylinder 5 preferably has an outer diameter equal to the inner diameter of the neck body 4, and a stepped portion h <b> 1 is formed at the boundary thereof, and the pushing cylinder 6 preferably has an inner diameter of the folding cylinder 5. It is assumed that they have substantially the same outer diameter, and a stepped portion h2 is formed at the boundary. When the neck portion 3 is shifted to the pushed-in state, the neck portions 3 are pushed from the stepped portions h1 and h2.

Reference numeral 6 a denotes a reinforcing concave portion (vertical groove) provided on the outer peripheral wall of the pushing cylinder portion 6. The recesses 6a are provided so as to extend in the axial direction of the push-in cylinder portion 6. In this example, three recesses 6a are provided at opposite positions of the peripheral wall that sandwich the pull ring 9a described later in a direction orthogonal to the extending direction. It shows about the case. On the one hand, the recess 6a increases the rigidity in the vertical direction of the push-in cylinder part 6 and, on the other hand, plays a role of imparting stretchability to the circumferential length of the push-in cylinder part 6. Thus, by providing the recessed part 6a, it becomes possible to provide the pushing cylinder part 6 with the elasticity of the circumferential direction, increasing the rigidity in the vertical direction, so that the pushing cylinder part 6 can be pushed in particularly suitably. Become.
As an alternative, the recess 6a may be shaped and arranged so that the cross-sectional shape of the push-in cylinder portion 6 is a star shape.

  Reference numeral 6b denotes an annular flange-shaped folded end portion extending radially inward of the upper end portion of the push-in cylinder portion 6 after tearing of the pull ring 9a at the planned break line 7. In the state where the base cap 13 of the pump is mounted on the neck portion 3, the outer surface 6 c of the folded end portion 6 b exhibits excellent smoothness, and the flange portion 13 b fixed to the outer surface 6 c and the inner surface of the base cap 13 Improve the sealing performance between.

  Reference numeral 9 denotes a sealing plug provided at the tip of the push-in cylinder portion 6. The sealing plug 9 is integrally provided with a pull ring 9a that forms a finger hook portion on the top surface thereof, and can be torn along a planned breaking line 7 that is thin like an annular groove. By tearing off the sealing plug, a content outlet 8 as shown in FIG. 4 is formed. At this time, the sealing plug 9 and its pull ring 9a are formed simultaneously with the blow molding of the container.

  Reference numeral 10 denotes a screw portion that is provided on the outer peripheral wall of the neck portion main body 4 and can be screwed with the screw portion 13 a of the base cap 13 of the discharger 11. As shown in FIG. 3, the screw portion 10 is composed of a screw thread 10 a obtained by forming the wall itself convexly in the radial direction. When the neck 3 is in the folded state shown in FIG. 3, a sealed space is formed between the recessed portion formed on the back side of the thread 10 a and the wall of the folding cylinder 5, and the shape of the thread 10 a An air frame 10b having a sufficient strength to hold the air is formed.

  The blow-molded thin-walled container 1 of the present invention is in the initial state shown in FIG. 1 immediately after blow molding, and the neck body 4, the folding cylinder part 5, and the push-in cylinder part 6 that form the neck part 3 are thin. In this initial state, the neck 3 does not have sufficient strength to screw the discharger 11 into the neck 3. On the other hand, in the pushed-in state shown in FIG. 2, the push-in tube portion 6 is pushed toward the bottom of the container to fold (reverse) the fold-up tube portion 5 toward the inner side of the neck body 4, and the push-in tube Since the wall portion of the portion 6 and the wall portion of the folding cylinder portion 5 are brought into close contact with each other, the neck portion 3 forms a wall body having a laminated structure in which three peripheral walls are arranged side by side along the radial direction. The neck 3 has sufficient rigidity for the discharger 11 to be screwed together. Since the pressing operation for shifting the neck 3 from the initial state to the pressing state shown in FIG. 2 is performed immediately after the blow molding is finished, the wall portions adjacent to each other are welded together. Can be formed without separately applying an adhesive.

  As mentioned above, although demonstrated based on the Example, this invention is not limited to the above-mentioned example, It can change suitably within the description range of a claim, for example, the neck part main body 4 and the folding cylinder part 5 Steps h1 and h2 are provided at the boundary between the folding cylinder part 5 and the pushing cylinder part 6, respectively, so that these step parts are used as starting points when pushing, but instead of the step part. An annular groove may be provided and pushed from this point. Further, the folding cylinder part 5 is provided with a taper that decreases its diameter from the base part toward the distal end, while the pressing cylinder part 6 has a taper that increases its diameter from the base part toward the distal end. By imparting, it becomes easy to shift from the initial state to the pushed-in state. In particular, by making the diameter of the tip of the push-in cylinder part 6 substantially the same as the diameter of the base part of the folding cylinder part 5, the direction in which the push-in cylinder part expands relative to the folding cylinder part 5 and the neck body 4 in the pushed state. Therefore, the walls having the laminated structure of the neck 3 are more closely attached to each other, and the rigidity of the entire neck 3 is further increased.

  Moreover, the shape and position of the recessed part 6a provided in the pushing cylinder part 6 are arbitrary, For example, you may provide in the whole outer peripheral surface of the pushing cylinder part 6 at equal intervals, and it is not necessary to provide at all.

  Thus, according to the blow-molded thin-walled container of the present invention, by integrally forming by blow molding, it is possible to omit steps such as bonding the members to each other as compared with the one constituted by a plurality of members, so that the efficiency is improved. Can be manufactured automatically. In addition, the neck portion of this thin-walled multi-layer structure has a three-part configuration of a neck portion main body, a folding tube portion, and a push-in tube portion, and a multi-layer structure in which these overlap each other, so that the neck portion is blown integrally. It is possible to provide rigidity sufficient to withstand screwing with a discharger or the like.

DESCRIPTION OF SYMBOLS 1 Thin container 2 Accommodating part 3 Neck part 4 Neck part main body 5 Folding cylinder part 6 Pushing cylinder part 6a Recessed part 6b Folding end part 6c Outer surface 7 Expected breaking line 8 Outlet 9 Seal plug 9a Pull ring 10 Screw part 10a Screw thread 10b Air frame 12 Pump part 13 Base cap 13a Base cap screw part 13b Flange part

Claims (5)

A blow-molded thin-walled container integrally molded by blow molding with a neck part that forms a path through which the contents are discharged from the container part, the container part that forms a filling space for the contents,
The neck part includes a neck part body having a threaded part on the outer peripheral wall, a folding cylinder part integrally connected to the upper end part of the neck part body and capable of being folded toward the inner side of the neck part body, and an upper end part of the folding cylinder part. Consisting of an integrally connected push-in cylinder,
A blow-molded thin-walled container characterized in that a sealing stopper is provided at the tip of the push-in cylinder to form a content extraction opening by tearing along a planned fracture line.   The threaded portion of the cervical body consists of a thread obtained by forming the wall itself to project radially outward, and in the pushed-in state of the cervical portion, the folding cylinder portion, the cervical body, and A blow molded thin-walled container according to claim 1, further comprising a sealed space in which sufficient air is held to hold at least the shape of the screw thread.   The blow-molded thin-walled container according to claim 1 or 2, wherein at least one concave portion extending in the axial direction is provided on an outer peripheral wall of the push-in cylindrical portion.   The blow molded thin-walled container according to any one of claims 1 to 3, wherein a pull ring that forms a finger hook portion is integrally connected to the top surface of the sealing plug when the sealing plug is torn off.   The folding wall portion is folded toward the inner side of the neck body, thereby enabling formation of a laminated wall portion in which the neck body, the folding tube portion, and the pushing tube portion overlap each other. The blow molded thin-walled container according to claim 1.

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