JPH08230077A - Tube type plastic bag with spout - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide a method for producing a plastic bag having a tubular spout that can be easily dispensed. [Structure] An inner diameter approximately equal to the outer diameter of a plastic tube is provided. Insert the plastic tube into the tubular molding drum having, fold back the end and fold back at the end of the forming drum to cover the end of the forming drum, and then press the end of the forming drum against the plastic ring. It is a method for producing a plastic bag having a tubular spout, which is characterized in that the tubular spout is fused to form a tubular spout, and the obtained tubular spout is fused to a plastic bag.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for producing a plastic bag with a tubular spout that can be easily filled or taken out when filling or pouring liquid, viscous material or powder from a plastic bag. It is about.

Conventionally, a plastic bag formed by heat-sealing the peripheral edge of a plastic film is used so that a fluid liquid, viscous body or powder of the contents can be easily poured from the plastic film. Is provided with a tube-shaped spout. A tubular spout in a plastic bag having a tubular spout is flexible, easy to handle, and has a good storability, and is particularly useful as a spout for large containers such as liquids, viscous bodies, and powders. However, when the conventional tubular spout is filled with the content liquid, it moves into the tube and protrudes from the plastic bag, causing bag breakage during transportation. In addition, the tubular spout has a drawback that the joint between the tube and the plastic bag does not open well due to the internal pressure of the content liquid after filling the content liquid.

In the conventional method of attaching the tubular spout to the bag, the tube is attached to the side seal portion of the bag, but the tip of the tube is heat-sealed so as not to close the opening of the plastic bag. Since it is fused by such as, the position of the spout cannot be freely changed, its manufacturing method has many work steps, and the tube is held in a circular shape and mounted three-dimensionally (right angle) on the bag surface. Since it was not possible to do so, smooth discharge work was difficult.

[0004]

Therefore, the inventor of the present invention fused a plastic ring to one end of the plastic tube instead of the conventional tubular spout of the plastic bag, and attached this plastic ring to an arbitrary plastic bag. Although a plastic bag having a spout that can be easily spouted by fusing to a location is provided (Japanese Patent Application No. 7-10
No. 716), the present inventor has completed the present invention as a result of various studies on a method for easily forming such a bag, and an object of the present invention is to provide a tubular spout that can be easily spouted. A method of manufacturing a plastic bag is provided.

[0005]

SUMMARY OF THE INVENTION The gist of the present invention is to insert the plastic tube into a tubular molding drum having an inner diameter substantially equal to the outer diameter of the plastic tube, and insert the end of the plastic tube into the tubular molding drum. The end of the forming drum is folded back to cover the end of the forming drum, and then,
A tubular shape characterized in that the end of the forming drum covered with a plastic tube is pressed against a plastic ring and fused to form a tubular spout, and the resulting tubular spout is fused to a plastic bag. It is a method of manufacturing a plastic bag having a spout. That is, in the present invention, one end of the plastic tube covers the end portion of the tubular molding drum, and this is pressed and fused to the plastic ring to form the tubular spout, and such means should be adopted. The tubular spout can be mounted in any position of the plastic bag three-dimensionally (perpendicularly) to the bag surface.

The present invention will be described in detail. The plastic bag in the present invention is a bag formed by fusing the periphery of a plastic film or a sheet, and this bag may be a single bag, a double bag, or is housed in an outer box. It may be an inner bag, and for example, it can be applied to a plastic bag containing foods such as concentrated fruit juice and vinegar, adhesives, and industrial chemicals such as a photographic developing solution. The material of this plastic bag is a single layer film of polyethylene, polypropylene or the like, or a heat-adhesive film of polyethylene, polypropylene, ethylene / vinyl acetate or the like on the inner and outer surfaces and a toughness of nylon, polyester or the like for the intermediate layer. Any film such as a film having an ethylene-polyvinyl alcohol film or a film having a gas barrier property such as an aluminum foil may be used.

According to the present invention, a tubular spout having a plastic ring at one end is fused to any portion of such a plastic bag. In the present invention, however,
First, a plastic tube is fused with a plastic ring to form a tubular spout. A tubular forming drum is used to form the tubular spout. The inner diameter of the forming drum is almost equal to the outer diameter of the tube of the tubular spout to be formed, the tube is inserted inside the forming drum, and the end portion 10 to 50 mm of this tube is folded back at the forming drum end portion to form the forming drum end portion. Cover. The end of the forming drum constitutes a circular fusion heater, and the tubes are fused in a circular shape along the outer side of the inner diameter of the plastic ring 3 to 10 mm to form a tubular spout.

The tube used has a length of 30 to 2
00cm, thickness 30 ~ 300μm, 100% strong elongation
% Or more, an inflation tube made of a single film of polyolefin such as polyethylene or polypropylene, or an inflation tube made of a laminated film of ethylene / vinyl acetate / ethylene or the like may be used, and the shape thereof is also limited. For example, a bellows shape may be used instead. When the thickness is 30 μm or less, the strength as a spout is not sufficient, and when the thickness is 300 μm or more, it is too thick and it is difficult to fold back at the end of the forming drum, which is not preferable. As the plastic ring, those of the same quality that can be fused to a plastic tube and a plastic bag are preferable, and made of polyethylene, polypropylene or the like having a thickness of about 1 to 3 mm, an inner diameter of 15 to 450 mm and an outer diameter of 20
The width is about 500 mm and the width is about 5 to 50 mm. The inner diameter of the tubular forming drum used is the same as the tube, ± 10 m / m, and the thickness is 10 mm to 50 mm. This end constitutes a circular fusion heater and is folded back at this end. The tube is pressed against the ring and fused.

[0009]

Embodiments of the present invention will now be described with reference to the drawings. Example 1 FIG. 1 is an explanatory view showing a manufacturing method according to the present invention.
In the figure, a tubular forming drum 1 used in the present invention is
The circular fused portion 2 is attached to one end face (top face) (a), and the inner diameter is 120 mmφ, which is almost equal to the diameter of the plastic tube to be inserted. Forming drum 1
Inside, the thickness is 80-300μ, elongation is 500-600%
The polyethylene inflation tube having a diameter of 120 mm was inserted, the tip portion of which was about 10 to 50 mm was projected from the end surface of the forming drum 1, and this was folded back along the end surface of the forming drum. Place the plastic ring 4 on the folded part of this tube, and insert it from the inner diameter of the ring by 3
It was pressed by the holding plate 5 so that the end portion of the tube was fused in a circular shape along the outer side of -10 mm (b) to form a spout in which the tube and the ring were integrated (c). Subsequently, the tube of the tube spout is housed in the circular ring retainer 9, and the bag film 8 is placed on the tube spout attachment sealer 7 to press the film 8 and the plastic ring of the spout. Fusing (fusion part 10), then,
The peripheral portion of the film with a tube spout was heat-sealed to obtain a plastic bag with a tube spout. A side sectional view of the obtained plastic bag is shown in FIG.

[0010]

As described above, according to the present invention, the manufacturing method in which the plastic ring is fused while maintaining the shape of the circular tube is inexpensive, and the plastic bag can be easily installed at any place without making a hole in the plastic bag. It becomes possible to manufacture a container inner bag with a tube spout.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a manufacturing method of the present invention.

FIG. 2 is a side sectional view of a plastic bag.

[Explanation of symbols]

1 forming drum 2 circular fusion part 3 plastic tube 4 plastic ring 5 ring holding plate 6 tube spout 7 tube spout mounting sealer 8 bag film 9 ring press 10 fusion part between film and ring

Claims (3)

[Claims] 1. A plastic tube is inserted into a tubular molding drum having an inner diameter substantially equal to the outer diameter of the plastic tube, and its end is folded back at the forming drum end to cover the forming drum end. After that, the end of the forming drum is pressed against a plastic ring and fused to form a tubular spout, and the obtained tubular spout is fused to a plastic bag. A method for manufacturing a plastic bag having a spout. 2. A plastic bag tube is inserted into a forming drum that matches the outer diameter of the plastic tube to be formed, and 10 to 50 mm of the end portion is folded back from the end of the forming drum (circular fusion heater portion) to make a plastic bag. Fuse along the inner diameter of the ring from 3 to 10 mm,
The method for producing a plastic bag having a tubular spout according to claim 1, which is used as a spout for a container. 3. The production of a plastic bag having a tubular spout according to claim 1, wherein a plastic ring having a tube spout is formed by circularly fusing a plastic ring for spouting a container and an inner bag film. Method.