JP2021035852A - Airless container - Google Patents

Abstract

To provide an airless container equipped with an airless pump that can receive and eject a content liquid in a high sustainable state of quality, is simple in structure and easy to manufacture without raising cost, and is applicable for a large-capacity container.SOLUTION: An airless container comprises a container body 20 that has an upper aperture and an air port 21, a lid part 10 that is fitted to the upper aperture and an airless pump 30 of a manual type that does not perform exchange with external air upon ejection. The lid part is vertically provided with a mouth part 12 opened to above and connected with a flexible bag body 11 to receive a content liquid oppositely to the mouth part, so that the airless pump is fitted on the mouth part. By the airless pump, the content liquid 13 filled in the bag body is ejected while reducing the volume of the bag body, and simultaneously external air can be admitted to an exterior of the bag body through the air port.SELECTED DRAWING: Figure 1

Description

The present invention relates to an airless container with an airless pump capable of storing and discharging the content liquid in a state where it does not come into contact with air, and particularly to an airless container in which the quality of the content liquid is reliably maintained and easy to manufacture.

Conventionally, there are known containers that store liquids such as liquids and pastes and allow them to be discharged little by little. A hand-push type pump dispenser is fitted in the mouth at the upper end of this container, and the contents can be discharged little by little by exchanging with the outside air with an appropriate valve structure. A tube extending toward the bottom inside the container may be connected to the pump dispenser so that the content liquid near the bottom can be completely discharged.

The content liquid stored in a container with a pump dispenser may easily deteriorate due to contact with the outside air, such as certain cosmetics and foods, and for such content liquid, it is called an airless container. A container with a special structure is used. The airless container stores the content liquid in a state where it does not come into contact with the outside air, and discharges the contents without exchanging with the outside air by an airless pump or the like, which is a pump dispenser having a structure that does not exchange with the outside air. Those having the structure as disclosed are known.

As a typical structure of an airless container, for example, as shown in FIG. 9, a core 61 that is in close contact with the inner wall of the container 60 having a shape-retaining property and is slidable in the vertical direction is provided so that the inside of the container is on the mouth side. The chamber 62 on the mouth side is filled with the content liquid without enclosing air, and a discharge tool such as an airless pump 64 is fitted in the mouth, and the chamber 63 on the bottom side is divided into two chambers. Is provided with a ventilation hole 65 that communicates with the outside of the container, and when the content liquid is discharged from the discharge tool, the internal pressure is reduced by that amount, so that the core 61 slides toward the mouth and the volume of the chamber 62 on the mouth side. On the contrary, the outside air flows into the chamber 63 on the bottom side from the ventilation hole 65 to increase the volume, so that the volume and the internal pressure of the entire container are kept constant. It is used for storage and use without exposing the contents to the outside air.

The above-mentioned airless container has a problem that if the inner wall of the container 60 and the core 61 are not sufficiently close to each other, the content liquid leaks to the bottom chamber 63 or the outside of the container, and the content liquid comes into contact with the outside air. there were. Further, the airless pump 64 provided at the mouth portion may also escape the pump pressure and may not be able to discharge properly. In order to maintain close contact, the container 60 needs to have shape retention and rigidity so that it will not be deformed when held by the user, so its material, shape, wall thickness, etc. are limited, and it has a large capacity. It was difficult to do. In addition, it was necessary to make the molding processing accuracy high.

Further, the inner wall of the container 60 and the core 61, which are in direct contact with the content liquid, are preferably made of a material that does not affect the content liquid, but are used for the core 61 because of their excellent adhesion and slidability. Since the polyolefin-based resin has adsorptivity to the content liquid, improvement has been desired. Further, there is a problem that application is difficult when the content liquid has high permeability.

Further, the container 60 needs to have a straight cylinder shape because it is difficult to secure the closeness of the core 61 if the inner wall has a taper or a curved surface portion, but if the container 60 has a straight cylinder shape, the mold at the time of molding the container 60 is formed. There was a problem that the pullability was poor and the production efficiency was poor. In addition, it takes time and effort to properly mount the core 61 in the container, and the production efficiency has to be lowered.

Japanese Unexamined Patent Publication No. 2000-309387

Therefore, the present invention is airless, which has less risk of contact with the outside air, has high quality retention of the content liquid, has a structure that is easy to manufacture, does not increase the cost, and can be applied to a large-capacity container. An object of the present invention is to provide an airless container with a pump.

In order to solve the above problems, the present invention comprises a container body having an upper opening and a ventilation hole, a lid portion fitted in the upper opening, and a manual airless pump that does not exchange with the outside air at the time of discharge. A flexible bag body for storing the content liquid is connected to the lid portion on the side opposite to the mouth portion, and the airless pump is fitted into the mouth portion. It is characterized in that the content liquid that has been attached and filled in the bag body is discharged by the airless pump while reducing the volume of the bag body, and at the same time, outside air can flow into the outside of the bag body from the ventilation holes. To provide an airless container.

In the above airless container, the content liquid is filled in a flexible bag body that can be easily manufactured by a general method such as stretch blow molding, so that the content liquid comes into contact with other members other than the bag body during storage. High quality retention can be ensured without doing so. In addition, the flexible bag body easily shrinks with the discharge of the content liquid by the airless pump to reduce the volume, and there is a close problem with the container body when the volume is reduced by sliding the core as in the conventional technology. Does not occur. In addition, since the content liquid does not come into contact with the container body, there are few restrictions on the material, shape, design, and decoration of the container body, and the degree of freedom in enhancing the commercial value is increased. In addition, it is difficult to make the container large in capacity with a container such as the conventional technology that reduces the volume by sliding the core, but it is possible to make the volume large by storing the content liquid in the bag body. Is.

In the above airless container, the bag body may be made of polyethylene terephthalate resin. There is no adsorptivity to the content liquids of cosmetics, toiletry products, etc., and the quality retention of the content liquids can be made higher.

In the above airless container, the bag body may be provided with a plurality of folds or folds. When the bag body contracts, it can be contracted into a constant shape along the creases or folds, and liquid residue is unlikely to occur.

In the above airless container, the airless pump may be connected to a tube that extends to the bottom of the bag and has an open tip to guide the content liquid to the airless pump. The content liquid can be discharged without excess liquid.

According to the airless container of the present invention, there is no risk that the content liquid will come into contact with the outside air, the quality retention of the content liquid is excellent, it is possible to cope with a large capacity, and precise design and manufacturing like a core can be performed. It is possible to provide an airless container that does not require necessary members, has few restrictions on the members and shape of the container body, has high productivity, and can reduce costs.

It is a schematic sectional drawing of the 1st form of the airless container of this invention. It is the schematic sectional drawing of the aspect which discharges the content liquid from the airless container of FIG. It is a schematic sectional drawing of the 2nd form of the airless container of this invention. It is a schematic sectional drawing of the 3rd form of the airless container of this invention. It is sectional drawing at the part of the line segment AA'of the 2nd form example of the airless container of this invention. It is explanatory drawing of the state that the bag body of the airless container of this invention contracts. It is a schematic sectional drawing of the 4th form of the airless container of this invention. It is a schematic sectional drawing of the 5th form of the airless container of this invention. It is a schematic sectional drawing of the form example of the conventional airless container.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiments described below. Further, in the following, the same reference numerals may be given to equivalent members and the like, and the description thereof may be omitted.

FIG. 1 is a schematic cross-sectional view of the first form of the airless container. The airless container 1 of the present embodiment includes a container body 20, a lid 10, and an airless pump 30 molded of a plastic resin as main constituent members. The container body 20 has a substantially tubular shape with an opening at the top and a ventilation hole 21 at the bottom that communicates the space inside the container with the outside. The lid portion 10 is fitted into the opening at the upper portion, and the bag body 11 made of a thin plastic resin that is flexible and easily deformed is connected to the lid portion 10, and the bag body 11 is housed in the container body 20.

The lid portion 10 has a substantially cylindrical mouth portion 12 having an open upper portion erected upward. A manual airless pump 30 that does not exchange with the outside air at the time of discharge is fitted to the lid portion 10 and the mouth portion 12. The mouth portion 12 and the airless pump 30 are provided with threads 32 and 32', which are fitting portions for fitting to each other without a gap. In addition to the threads 32 and 32', a known structure such as fitting and undercut can be appropriately applied to the fitting portion as long as it can be fitted without a gap. Further, the packing 33 can be attached if necessary.

Since the mouth portion 12 and the airless pump 30 are fitted to each other without a gap, the inside of the bag 11 is in a state of being shielded from the outside air except for the outflow path of the airless pump 30, so that the content liquid 13 is put into the bag. It can be filled so as not to come into contact with members other than 11 or the outside air. Since a known structure can be appropriately adopted for the airless pump 30, a detailed structure is omitted in the drawing, but the content liquid 13 is discharged from the nozzle 31 by manually pushing the pump head portion up and down. Let me. At this time, since the airless pump 30 does not exchange with the outside air, as shown in FIG. 2, the bag body 11 is deformed to reduce the volume of the bag body 11 while discharging the content liquid 13, and at the same time, the bag body 11 is discharged from the ventilation holes 21. The structure is such that the internal pressure of the container body 20 is kept constant by allowing the outside air to flow into the outside.

Since the bag body 11 is made of a thin plastic resin such as polyethylene terephthalate (PET) resin that is flexible and easily deformed, it easily deforms according to the discharge amount and the volume decreases, and the content liquid 13 stays in the bag body 11 until the discharge is completed. The quality of the content liquid 13 is maintained because the state of not contacting other members and the outside air is maintained.

The size of the bag body 11 is not particularly limited, and a large-capacity bag body can be obtained if the thickness has a strength corresponding to the capacity. In that case, the container body 20 may be large enough to accommodate the bag body 11, and the material and strength can be appropriately set regardless of the content liquid 13.

As described above, since the container body 20 does not come into contact with the content liquid 13, its material, shape, wall thickness, decoration, etc. can be set and selected regardless of the characteristics of the content liquid 13, and in addition to the performance as a container, You can select the most suitable one in consideration of productivity, commercial value, cost, etc.

The material of the container body 20 is not particularly limited as long as it is a resin suitable for molding, but for example, an olefin resin, an ethylene / vinyl copolymer, a styrene resin, a vinyl resin, a polyamide resin, a polyester resin, and a polycarbonate. Examples include resins and biodegradable resins. The material of the bag 11 is not particularly limited as long as it can be processed into a thin wall and has flexibility and does not have reactivity such as adsorptivity to content liquids such as cosmetics and toiletries. Preferred is polyethylene terephthalate resin.

FIG. 3 is a schematic cross-sectional view of the second form of the airless container of the present invention. In the airless container 2 of the present embodiment, the airless pump 35 is connected to the tube 34 that reaches the bottom of the bag body 11. The tube 34 is for delivering the content liquid 13 from the opened tip to the airless pump 35, and is provided so that the content liquid 13 staying at the bottom of the bag body 11 can be completely discharged. Since the content liquid 13 tends to stay at the bottom due to its own weight, it is particularly effective when the bag body 11 is relatively large and has a large capacity. The opening may be provided on the wall surface of the tube in addition to the tip.

FIG. 4 is a schematic cross-sectional view of the third form of the airless container of the present invention. The airless container 3 of the present embodiment has a shape in which the inner wall of the container body 22 has a taper. In the airless container of the present invention, since the content liquid 13 is stored in the bag body 11 as described above, it is not necessary to slide the core as in the prior art, and such a shape can be obtained. .. When the inner wall of the container body 22 has a tapered shape, the container body 22 can be manufactured with good die-cutting property when manufactured by injection molding, and the production efficiency can be improved. Needless to say, a shape having a curved surface may be used in addition to the shape having a taper.

FIG. 5 is an example of a cross-sectional view of the second embodiment of the airless container of the present invention at a portion corresponding to the line segment AA'in FIG. In the airless container of the present invention, (a) the cross section of the container body 20 is circular and the cross section of the bag body 11 is also circular, and (b) the cross section of the container body 23 is square and the cross section of the bag body 15 is also square. (C) The cross section of the container body 20 is circular and the cross section of the bag body 16 is a polygon with creases in the vertical direction. It can have various shapes such as a polygonal shape with creases in the vertical direction.

When the shape of the bag body is a polygonal shape with creases in the vertical direction, as shown in FIG. 6, when the bag body 16 contracts as the content liquid 13 is discharged, the bag body is along the crease 14. It is easy to fold and shrink into a certain shape. If there are no creases, the shape of the bag when it contracts tends to be irregular, and there is a risk that a liquid pool will be formed and the liquid will not be discharged, resulting in liquid residue. This is more preferable because it is difficult for a liquid pool to be formed.

FIG. 7 is a schematic cross-sectional view of the fourth embodiment of the airless container of the present invention. In the airless container 4 of the present embodiment, the bag body 18 has a rectangular shape when viewed from a certain direction (0 ° direction), and has a tapered shape when viewed from a direction rotated by 90 °. In this case, as the content liquid is discharged, the bag body 18 contracts so as to be crushed into a flat plate. Therefore, it is difficult for a liquid pool to be formed, and it is difficult for liquid residue to occur.

FIG. 8 is a schematic cross-sectional view of the fifth embodiment of the airless container of the present invention. A part of the airless pump is omitted in the figure. The airless container 5 of the present embodiment has a so-called bellows shape in which creases are provided in a direction around the bag body 19. In this case, as the content liquid is discharged, the bag body 19 contracts so that the bellows contract. Therefore, it is difficult for a liquid pool to be formed, and it is difficult for liquid residue to occur.

As described above, according to the airless container of the present invention, the content liquid is filled in a flexible bag body that can be easily manufactured by a general method, so that high quality retention can be ensured and the container body can be maintained. We can provide airless containers that have few restrictions on the material and shape of the product, have high production efficiency, and can handle large capacities.

1, 2, 3, 4, 5 ... Airless container 10 ... Lid 11, 15, 16, 17, 18, 19 ... Bag body 12 ... Nozzle 13 ... Contents liquid 14 ...・ ・ Folds 20, 22, 23, 24 ・ ・ ・ Container body 21 ・ ・ ・ Vent holes 30, 35 ・ ・ ・ Airless pump 31 ・ ・ ・ Nozzle 32, 32 ′ ・ ・ ・ Screw thread 33 ・ ・ ・ Packing 34 ・··tube

Claims (4)

A container body having an upper opening and a ventilation hole, a lid portion fitted in the upper opening, and a manual airless pump that does not exchange with the outside air at the time of discharge are provided, and the upper portion of the lid portion is opened. A flexible bag body for storing the content liquid is connected to the side opposite to the mouth part while the mouth part is erected, the airless pump is fitted to the mouth part, and the bag body is fitted by the airless pump. An airless container characterized in that the content liquid filled in is discharged while reducing the volume of the bag body, and at the same time, outside air can flow into the outside of the bag body from the ventilation holes. The airless container according to claim 1, wherein the bag body is made of polyethylene terephthalate resin. The airless container according to claim 1 or 2, wherein the bag body is provided with a plurality of folds or folds. The invention according to any one of claims 1 to 3, wherein the airless pump is connected to a tube that extends to the bottom of the bag and has an open tip to guide the content liquid to the airless pump. Airless container.

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