# US 10,479,545 B2 · Double container

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- Number: US 10,479,545 B2
- Document ID: US10479545B2
- Status: Granted
- Kind: B2
- Application number: 15/577,086
- Filed: 2016-05-27
- Published: 2018-06-28
- Granted: 2019-11-19
- Earliest claimed: 2015-05-28
- Assignees: Kyoraku Co., Ltd.
- Applicants: Kyoraku Co., Ltd.
- Inventors: Shinsuke Taruno; Tetsuaki Eguchi; Kentaro Uchihashi
- Web page: https://patentgrep.com/patent/US10479545B2

## CPC

- B65D 1/40: Details of walls (other container details B65D23/00, B65D25/00)
- B65D 23/02: Linings or internal coatings
- B65D 83/771: {for dispensing fluent contents by means of a flexible bag or a deformable membrane or diaphragm}
- B65D 85/72: for edible or potable liquids, semiliquids, or plastic or pasty materials
- B65D: CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES

## Abstract

Provided is a double container (1) configured so that water entrance through an atmospheric air introduction hole (15) can be reliably prevented and that an adverse effect due to water entrance into an intermediate space (21) between an outer shell (11) and an inner bag (12) can be avoided. The double container (1) has the outer shell (11) and the inner bag (12). The inner bag (12) contracts in association with a decrease in contents housed in the inner bag (12). The outer shell (11) is provided with the air introduction hole (15). Further, a hydrophobic filter configured to allow air penetration and block water is provided to close the air introduction hole (15).

## Claims

### Claim 1

A double container comprising:
an outer layer as an outer shell; and
an inner layer as an inner bag, wherein
the inner bag contracts in association with a decrease in a content housed in the inner bag,
the outer layer is provided with a recessed portion and the recessed portion is provided with an atmospheric air introduction hole, and
a hydrophobic filter configured to allow air penetration and block water is provided to close the atmospheric air introduction hole.

### Claim 2 (depends on 1)

The double container according to claim 1, wherein
the hydrophobic filter is formed of non-woven fabric made of polypropylene.

### Claim 3 (depends on 2)

The double container according to claim 2, wherein
a weight of the polypropylene non-woven fabric per unit area is 160 g/m2 to 250 g/m2.

### Claim 4 (depends on 1)

The double container according to claim 1, wherein
the hydrophobic filter includes hydrophobic microporous membrane and non-woven fabric, the microporous membrane and the non-woven fabric being stacked on each other.

### Claim 5 (depends on 1)

The double container according to claim 1, wherein
the atmospheric air introduction hole is provided with a valve member, the valve member being configured to adjust air outflow/inflow between an external space and an intermediate space formed between the outer layer and the inner layer.

### Claim 6 (depends on 5)

The double container according to claim 5, wherein the recessed portion comprises an upper stage and a lower stage provided with the atmospheric air introduction hole, the valve member is attached to the lower stage and the hydrophobic filter is bonded to the upper stage.