Flexible bags – Bag having means to facilitate opening it by severing bag... – Combined with – or modified for opening by – a sharp-edged...
Reexamination Certificate
2000-08-23
2002-07-16
Garbe, Stephen P. (Department: 3727)
Flexible bags
Bag having means to facilitate opening it by severing bag...
Combined with, or modified for opening by, a sharp-edged...
C222S082000
Reexamination Certificate
active
06419393
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a bag for containing a liquid or powdery detergent or the like.
BACKGROUND OF THE INVENTION
Conventionally, liquid or powdery detergents for household use and the like are packed in plastic containers for sale. When the detergent in the container is used up, for example, a user may purchase a detergent refill packed in a plastic bag and refill the empty container with the detergent refill.
The user performs a refilling operation to pour the detergent refill into the empty container by holding the flexible plastic bag in hand. However, the plastic bag is so flexible that the mouth of the bag is positionally unstable, making it difficult to perform the refilling operation with the container and the bag brought into mouth-to-mouth contact with each other. Therefore, the user is likely to inadvertently spill the detergent out of the container.
One known approach to this problem is that a plastic bag containing a detergent refill is set in an empty container on the top of which is provided a liquid dispenser having a pump with a nozzle and a suction tube projecting downward from the pump and, with the bag being pierced with the tube, the detergent is delivered out of the bag through the nozzle by operating up and down the pump.
In this case, not only a portion of the bag to be pierced with the tube but the entire bag is formed of a laminated film comprising a stretched nylon film and a polyolefin film. The stretched nylon film is liable to be torn by a force exerted thereon when the bag is pierced with the tube. The polyolefin film laminated with the stretched nylon film is also torn along with the stretched nylon film by the piercing force when the bag is pierced with the tip of the tube. Thus, the laminated film is torn, so that air flows into the bag through tears developed in the laminated film around a hole through which the tube penetrates. When the detergent in the bag is reduced to a small quantity, the air is sucked out through the tube by the operation of the pump, thereby making it impossible to completely deliver the detergent out of the bag. Further, when the container falls down, the detergent may leak out of the bag through the tears within the container to make the inside of the container dirty, or leak out of the container.
DISCLOSURE OF THE INVENTION
To solve the aforesaid problems, it is an object of the present invention to provide a bag which is free from development of tears around a hole formed therein when pierced with tubular or hollow needle suction means.
In accordance with a first aspect of the present invention to achieve the aforesaid object, there is provided a bag for containing a liquid or powdery material, the bag comprising a penetrable portion to be pierced with tubular or hollow needle suction means for delivering the material out of the bag, the penetrable portion comprising a laminated sheet having an outer layer including at least one of a calendered film (e.g., aluminum foil) and a stretched film, and an inner layer of an unstretched film, wherein a peeling strength between the outer layer and the inner layer is 0.0490 to 3.4323 N/15 mm width.
The bag according to the first inventive aspect is preferably of a so-called stand-pack type (self-supporting type) having an outwardly bulged bottom portion and a body portion, the bottom portion serving as the penetrable portion to be pierced with the suction means, the body portion comprising a laminated sheet having an inner layer of an unstretched film, the unstretched film of the inner layer of the body portion and the unstretched film of the inner layer of the bottom portion being fusion-bonded along a seam between the body portion and the bottom portion by heat sealing.
In accordance with a second aspect of the present invention, there is provided a bag for containing a liquid or powdery material, the bag comprising a penetrable portion to be pierced with tubular or hollow needle suction means for delivering the material out of the bag, the penetrable portion comprising a laminated sheet having an outer layer including at least one of a calendered film (e.g., aluminum foil) and a stretched film, an intermediate layer of an unstretched film, and an inner layer of an unstretched film, wherein a peeling strength between the outer layer and the intermediate layer is 0.0490 to 3.4323 N/15 mm width, and a peeling strength between the intermediate layer and the inner layer is 0.0490 to 3.4323 N/15 mm width.
The bag according to the second inventive aspect is preferably of a so-called stand-pack type (self-supporting type) having an outwardly bulged bottom portion and a body portion, the bottom portion serving as the penetrable portion to be pierced with the suction means, the body portion comprising a laminated sheet having an inner layer of an unstretched film, the unstretched film of the inner layer of the body portion and the unstretched films of the intermediate and inner layers of the bottom portion being fusion-bonded along a seam between the body portion and the bottom portion by heat sealing.
In accordance with a third aspect of the present invention, there is provided a bag for containing a liquid or powdery material, the bag comprising a penetrable portion to be pierced with tubular or hollow needle suction means for delivering the material out of the bag, the penetrable portion comprising a laminated sheet having an outer layer of an unstretched film, an intermediate layer including at least one of a calendered film (e.g., aluminum foil) and a stretched film, and an inner layer of an unstretched film, wherein a peeling strength between the outer layer and the intermediate layer is 0.0490 to 3.4323 N/15 mm width, and a peeling strength between the intermediate layer and the inner layer is 0.0490 to 3.4323 N/15 mm width.
The bag according to the third inventive aspect is preferably of a so-called stand-pack type (self-supporting type) having an outwardly bulged bottom portion and a body portion, the bottom portion serving as the penetrable portion to be pierced with the suction means, the body portion comprising a laminated sheet having an inner layer of an unstretched film, the unstretched film of the inner layer of the body portion and the unstretched film of the inner layer of the bottom portion being fusion-bonded along a seam between the body portion and the bottom portion by heat sealing.
The bags according to the invention, for example, are each set within a container for use, and pierced with the suction means which extends from a liquid or powder dispenser of the container so that the liquid or powdery material can be delivered out of the bag through the suction means. In accordance with the first inventive aspect, the penetrable portion of the bag to be pierced with the suction means is formed of the laminated sheet having the outer layer including at least one of the calendered film (e.g., aluminum foil) and the stretched film and the inner layer of the unstretched film as described above. A preferred example of the stretched film for the outer layer is a stretched nylon film. since preventive measures is required against degradation of the material to be contained in the bag depending on the kind of the material, the calendered film, e.g., an aluminum foil is preferably employed which provides a barrier effect. An inner surface of the outer layer may be comprised of the unstretched film, e.g., an unstretched polyolefin film such as an unstretched polyethylene film. In this case, the unstretched film for the inner layer may also be an unstretched polyolefin film such as an unstretched polyethylene film, and the unstretched polyolefin film in the inner surface of the outer layer is opposed to the unstretched polyolefin film of the inner layer. When an edge portion of the unstretched polyolefin film of the inner layer of the bottom portion not intended to be pierced with the suction means is fusion-bonded to an edge portion of the polyolefin film of the inner layer of the body portion by heat sealing for joining the bottom port
Daiwa Gravure Co., Ltd.
Fildes & Outland, P.C.
Garbe Stephen P.
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