Evacuable bag

Abstract

An evacuable bag is provided which can prevent any possible contact between laminated sheets so as to achieve a complete deaeration, and can be produced at low cost. Said evacuable bag 10 has a bag main body 1 composed of flexible non-breathable laminated sheets 11, and provided with an air-outlet 2 which allows the bag main body 1 to communicate with the outside, and a closable opening 3, the air-outlet 2 permits deaeration of the air in the bag main body 1, the laminated sheet 11 consists of at least two layers, the outer layer is composed of non-breathable synthetic resin films 12, 13, and the inner layer is a nonwoven layer formed with a mass of synthetic fibers and unevenness on the surface thereof, at least one part of the synthetic fibers constituting said nonwoven layer has thermoweldability.

Description

BACKGROUND OF THE INVENTION [0001] 1. Technical Field [0002] The present invention relates to an evacuable bag which is to be deaerated after it contains an article. [0003] 2. Background Art [0004] As disclosed in Japanese publication No. H01-294027, there existed in the past evacuable bags which have an air outlet formed on the bag main body made of flexible synthetic resin for compacting an article such as clothing and beddings in the bag. [0005] To be brief, the way of use comprises putting beddings etc. through an opening into the evacuable bag, then closing the opening by means of a sliding fastener, attaching the nozzle of a vacuum to the air outlet to suck up the air inside the bag, so that the air can be expelled from the outlet. And then, the evacuable bag can be retained vacuumed by shutting the air outlet against incoming air. When the bag containing an article such as clothing and beddings is deaerated, the air within the contents may also be sucked out simultaneously. S...

AI Technical Summary

Benefits of technology

"The present invention provides an evacuable bag with a flexible non-breathable laminated sheet structure. The bag has an air-outlet and a closable opening, allowing air to be evacuated. The laminated sheets consist of at least two layers, with the outer layer being a combination of non-breathable synthetic resin films and a nonwoven layer made of synthetic fibers. The nonwoven layer has a ground texture and islet textures that lie scattered on the ground texture and rise from it. The nonwoven layer has uneven surfaces caused by the ground texture and islet textures. The average size difference between the minimum and maximum sizes of the nonwoven layer in the ground texture is preferably between 50 and 300 microns. The nonwoven layer is made of polyolefin synthetic fibers. The outer layer of the laminated sheet consists of nylon film and polyethylene film piled up in this order, with the ground texture consisting of polyethylene synthetic pulps and polyethylene-polypropylene conjugate fibers. The two nonwoven layers inside the bag are adhered to each other by heat seal. The technical effects of the invention include improved air evacuation, durability, and flexibility of the bag."

Problems solved by technology

However, in deaeration by a vacuum, laminated sheets corresponding to the air outlet in position may partly stick to each other during the process, thus resulting in incomplete deaeration.

However, such a way of making a raised pattern on the surface of the laminated sheet may cause a high cost of production.

However, it was found that the Japanese-paper-style sheets were composed of natural fibers, or rayon fibers used in a paper-making process and not desirable concerning heat-sealing.

Thus, with the uneven surface of the Japanese-paper-style sheets laid down inside the evacuable bag, the laminated sheets did not be heat-sealed in a bag-making process.

But, this additional process will result in covering the entire surface of the Japanese-paper-style sheet with the backing film, whereby the uneven surface will not appear on the back face of the sheet, only to fail an achievement the inventor intends.

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