JP2006182405A - Spout bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an efficiently and economically a spout bag showing a superior outer appearance by a method wherein a shape of the spout is set in such a way that a size of molten fixed part becomes smaller than a diameter of a pouring part of the bag, a shape of the molten fixed part is gradually changed from a circular shape to a flat elliptical shape as it approaches to the extremity end of the bag, and the molten fixed surface is finished to its rough surface. <P>SOLUTION: This structure is made such that a base part of a spout 2 having a cap 3 is molten and fixed to a pouring-out part placed at one end of a synthetic resin bag 1. The spout 2 has a pouring-out port 4-1 arranged at one end of a pouring-out cylinder 4 and a molten and fixed part 5 arranged at the other end of the pouring-out port 4-1 and extending out in a direction crossing at a right angle with the axial direction of the pouring-out port 4-1. The spout 2 extends in a longitudinal direction of the molten and fixed part 5. A width of shorter molten and fixed part 5 is smaller than a diameter of the pouring-out port 4-1. A shape of the spout 2 is an ellipse resulting from gradual changes into a flat toward extremity end from the inner diameter of the pouring-out cylinder 4 with the same area as that of an inner diameter. The molten and fixed part 5 has a flat and substantial elliptical shape. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a resin bag filled with a liquid such as foods, beverages and detergents, and relates to a spout bag having a spout welded to a liquid spout.

A spout of a container in which a spout is conventionally welded between the upper edges of a synthetic resin film bag is provided with a pour tube at the center and is welded to the bag while maintaining this circular cross section. At this time, in order to ensure the welding with the bag, a substantially rhombic plate elongated in the right and left directions in the direction perpendicular to the dispensing cylinder is formed at the lower end of the dispensing cylinder as the welding portion. In order to take out the contents, the circular shape is kept as it is in order to make the passage area of the contents inside the spout constant. Therefore, in the spout shape of the conventional spout bag, the spout welded portion has no width smaller than the diameter of the spout. For example, Japanese Patent Application Laid-Open No. 10-129689 proposes a spout bag in which a core is provided in the longitudinal direction of the weld fixing portion in order to improve the appearance.
Japanese Patent Laid-Open No. 10-129689

  However, the spout spout and the welded portion have the same width or a larger welded portion. Moreover, in order to obtain a reliable sealing strength, a high sealing temperature or a long heating time is required.

  On the other hand, since the size of the welding part of the spout and the inlet of the bag does not match, it is necessary to pull the bag and match the welding part of the spout of the bag to the welding part. This causes problems such as wrinkles and poor appearance, and pinholes at the end of the spout due to high temperature or prolonged heating.

  In the spout bag, the spout shape is such that the size of the welded portion is smaller than the diameter of the pour-out portion of the bag, and the shape of the passage portion of the contents is gradually flattened from the circle to the tip. By improving the weldability by deforming into an elliptical shape and finishing the weld surface to a rough surface, it became possible to solve the above-mentioned problems and to obtain a spout bag with good appearance efficiently and economically. .

  The spout bag according to claim 1 of the present invention has a structure in which a base portion of a spout with a cap is welded and fixed to a pouring portion at one end of a synthetic resin bag body, and the spout is provided at one end of the pouring tube. A spout provided in the other end of the spout and extending in a direction perpendicular to the axial direction of the spout, and a spout extending in the longitudinal direction of the weld. As shown in FIG. 2, the shorter width is smaller than the diameter of the spout. Thereby, the amount of pulling the welded portion of the bag body at the time of welding is reduced, and the problem that wrinkles are generated on the welding surface and the appearance is deteriorated can be solved.

  Further, the shape of the spout according to claim 2 of the present invention is such that, as shown in FIG. 3, from the inner diameter of the pouring tube ((A) shown in FIG. 3), the spout has the same area as the inner diameter. A spout with a gradually flattened elliptical shape (changed from (b) to (c) shown in FIG. 3), wherein the welded portion is a flat, substantially elliptical shape ((c) shown in FIG. 3) It is characterized by having. This improves the familiarity between the bag and the spout weld at the weld, and can prevent the formation of a space at the end, in particular, to obtain a weld with a good and perfect seal strength. it can.

  The shape of the spout according to claim 3 of the present invention is such that a plurality of ribs are arranged in the longitudinal direction of the welded portion, and the ribs are formed substantially parallel to the longitudinal direction of the welded portion and over the entire circumference. The welding surface is characterized in that fine irregularities having an average surface roughness Ra of 10 to 1500 μm (JIS B0601-1994) are formed. This eliminates the need for high-temperature heating and long-time heating during welding, and can solve problems such as pinholes occurring at the end of the spout. The same effect can be obtained for the shape of the spout according to claim 4.

  The spout of the present invention is injection molded by a known method using a synthetic resin such as polyethylene or polypropylene. The surface of the rib part of the spout part of claim 3 or the surface of the weld part of claim 4 is roughened by known embossing, knurling, shot blasting, or the like, and is performed at the time of injection molding or after molding. .

According to the present invention, since the spout welded portion has a flat elliptical shape, the contact with the welded portion of the bag body is smooth, and the surface of the welded portion is roughened at a relatively low temperature. In addition, the welding process can be performed in a short time, and it is possible to obtain a weld having a good and perfect sealing strength.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a partially broken front view of the spout bag of the present invention. In the figure, 1 is a bag body, 2 is a spout, 3 is a cap, 4 is a pouring tube, 5 is a welded part between the spout and the bag, 6 is a welded part of the bag, 7 is a welded shoulder, and 8 is a scale. 9 and 9 are projecting portions.

  FIG. 2 is a partially broken plan view of FIG. 1 showing a state before the film is welded. In the figure, 10 indicates a film. Because of the state before welding, there is a gap between 5 welds and 10 films.

  FIG. 3 is a bottom view of the spout. A state in which the passage of the contents according to claim 2 is gradually deformed into an elliptical shape from the circular shape toward the tip is indicated by (a), (b), and (c). The spout weld has a flat oval shape, so the contact with the welded part of the bag body is smooth, and the gap between the welded fixing part and the bag body at the both ends of the welded fixing part is much smaller than the conventional cylindrical shape. Therefore, it is possible to obtain a weld having a good and perfect sealing strength.

  FIG. 4 is a longitudinal sectional view of the spout portion. The passage of contents changes smoothly from a circular shape (A) to a flat elliptical shape (C).

For comparison, the state of the welded portion of the conventional spout is shown in FIGS. In the conventional example, the gap with the bag body at both ends of the welded portion is very large.

<Example 1>
The spout used in the present invention was manufactured by injection-molding polyethylene. As shown in FIG. 3, the spout has an outer diameter of 19 mm, an inner diameter of 16 mm, and a short oval shape of the welded portion. The outer diameter is 12 mm, the inner diameter is 9 mm, the outer diameter is 47.9 mm, and the inner diameter is 44.9 mm. The length of the welded portion in the longitudinal direction is 59.1 mm. In this case, the circumferential length of the welded seal portion was 223.3 mm, and it was sufficient to pull 3.3 mm at the time of welding with respect to the bag width of 220 mm.

<Comparative example>
As shown in FIG. 5, the conventional circular spout has an outer diameter of 19 mm and an inner diameter of 16 mm, an outer diameter of the welded portion of 19 mm and an inner diameter of 16 mm, and the longitudinal length of the welded portion is 37 mm. . In this case, the circumference of the welded seal portion is 230 mm, and it must be pulled by 10 mm at the time of welding with respect to the bag width of 220 mm, which requires high-temperature and long-time welding, the appearance of the welded surface is poor, and the end of the spout A pinhole occurred.

It is the partially broken front view of the spout bag concerning the present invention. It is the partially broken top view of the spout welding part which shows the state before welding a film. It is a bottom view of a spout. It shows a state where it is gradually deformed into an elliptical shape from the circular entrance portion toward the tip, and becomes a flat elliptical shape (a) (b) (c). It is a longitudinal cross-sectional view of a spout part. It is a figure which shows the welding part state of the conventional spout. 6 is a cross-sectional FF in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bag body 2 Spout 3 Cap 4 Outlet tube 4-1 Outlet 5 Spout and bag welding part 6 Bag welding part 7 Welding shoulder part 8 Scale part 9 Protruding part 10 Film A, B, C Cross-sectional shape of the content passage

Claims (4)

  A spout bag having a synthetic resin spout welded portion sandwiched between the upper edges of the synthetic resin film bag, and the welded portion being heated and welded between the upper edges. A spout having a spout provided at one end of the tube and a weld provided at the other end of the spout and extending in a direction perpendicular to the axial direction of the spout, the shape of the weld is A synthetic resin spout bag, which is an ellipse, and has a shorter outer diameter of the ellipse than a diameter of an outer shape of the pouring cylinder.   The shape of the spout is a spout having a passage of contents gradually changed from the inner diameter of the dispensing cylinder to a flat elliptical shape in the same area as the inner diameter area, and the welded portion is a flat, almost elliptical shape. The synthetic resin spout bag according to claim 1, which has a shape.   A plurality of ribs are arranged in the longitudinal direction in the weld portion of the spout, the ribs are formed substantially parallel to the longitudinal direction of the weld portion and over the entire circumference, and an average surface roughness is formed on the weld surface of the rib. The synthetic resin spout bag according to claim 1, wherein minute irregularities having a thickness Ra of 10 to 1500 μm are formed.   2. The synthetic resin spout bag according to claim 1, wherein minute unevenness having an average surface roughness Ra of 10 to 1500 μm is formed on the welding surface over the entire surface of the welding portion of the spout.

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