JPH0995357A - Bag for filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it easy to put tea leaves or the like into a bag, by joining respective side edges of the first and second sheets in the range from the nearby position of the upper end of the bag to the lower end and forming mutually separable opening ends in the part of sheets which are not joined to each other within the range from the upper end of the bag to the lower end thereof. SOLUTION: A bag 1 is provided with joining lines 10 leaving the external side edges at both right and left side edges. In the lower part A of the joining line A, the lower part of the superposed side wall 4 is connected to the front end of the folded-back free end 6 so as not to be peelable. And in the upper part B of the joining line 10, the upper part of the side wall 4 is connected to the free end 6 so as not to be peelable and the upper part of the side wall 5 is connected to the free end so as not to be peelable to form the opening edges 14, 15 of the bag 1 respectively. Since the opening edges are mutually separable, when it is opened to form a cylindrical shape, these edges 14, 15 are widened to form a funnel and the shape is made stable and hence, tea leaves or the like can be easily contained in the bag 1.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a filter bag suitable for use in containing tea leaves.

[0002]

2. Description of the Related Art Heretofore, bags for filters of this kind have been known. For example, in Japanese Utility Model Laid-Open No. 59-138568, a water resistant sheet is folded in two, each free end of the sheet is folded back by a slight dimension, and the stacked sheets are joined at each of the left and right side edges. By doing so, a filter bag having an opening formed at the upper end is disclosed. By folding back the free end, a downward pocket is created at the top of the bag, so by inserting the other top into one of the top pockets or the pocket formed by turning this pocket over, Can be sealed. If you put tea leaves or shavings into the bag beforehand, and then put it in hot water after sealing, you can easily put tea or take out the soup stock.

[0003]

The bag of the above-mentioned known example becomes a tubular shape when it is opened. The smaller the opening diameter of the tubular bag, the more difficult it is to put tea leaves or the like.

Therefore, an object of the present invention is to make it easy to put tea leaves or the like into a bag for this type of filter.

[0005]

[Means for Solving the Problems] The present invention provides means for solving the above problems as follows.

The present invention is premised on a bottomed filter bag having an opening formed at the upper end by joining the left and right side edges of the overlapping first and second liquid-permeable sheets to each other. .

Under such a premise, the front end portions of the first and second sheets are bent at the upper end of the bag toward the lower end of the bag, and the first and second sheets are still bent. A downward pocket is formed by joining to the left and right side edges of the non-existing portion, and the side edges of the first and second sheets are joined to each other in the range from near the upper end of the bag to the lower end. It is a feature of the present invention that the respective portions of the first and second sheets in the unjoined range from the vicinity of the upper end to the upper end form open end portions that can be separated from each other. .

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the accompanying drawings.

1 and 2 are a perspective view of a filter bag 1 made of a liquid-permeable nonwoven fabric 2 and a sectional view taken along line II-II thereof. The non-woven fabric 2 is bent at the bottom 3 of the bag 1 to form the side wall 4,
Free ends 6 and 7 which form 5 and which extend upwards are bent outwards at the upper edge 8 of the bag 1.

The bag 1 has a joining line 10 on both left and right edges, leaving outer edges, and of the joining line 10, a lower end of the side wall portions 4 and 5 which overlap at the lower portion A and a free end portion folded back. The tip portions of 6 and 7 are irremovably joined. At the upper portion B of the joining line 10, the upper portion of the side wall portion 4 and the free end portion 6 are non-separablely joined, while the upper portion of the side wall portion 5 and the free end portion 7 are non-separablely joined, respectively, and the bag 1 To form the opening edge portions 14 and 15. The opening edges 14 and 15 are
Since they can be separated from each other as shown in the drawing, when the bag 1 is expanded and formed into a cylindrical shape, the edges 14 and 15 thereof spread in a funnel shape, and it becomes easy to put tea leaves or the like into the bag 1. As is apparent from FIG. 2, downward facing pockets 16 and 17 are formed in the opening edge portions 14 and 15, respectively. At the boundary portion between the lower portion A and the upper portion B of the joining line 10, the side edges of the sidewall portions 4 and 5 are connected to the joining line 10, and the sidewall portions 4 and 5 overlap each other.
There is a joining line 11 in the width direction that joins 5 and the free ends 6 and 7 in a non-separable manner. Due to the joining line 11, the funnel-shaped edges 14, 15 do not easily separate from each other.

The bag 1 shown in plan view in FIG. 3 is sealed. In order to seal the bag 1 in this way, for example, the left and right corners of the upper end are bent toward the side wall 4 as shown by arrows P and Q, and then the free end 7 is turned over so that the pocket 17 is turned over. May be folded back in the direction of arrow R to cover the free end portion 6.
Prior to sealing, tea leaves, shavings, etc. are put in the bag 1, and the sealed bag 1 is put into hot water or water.

The bag 1 shown in cross section in FIGS. 4 and 5 is of a different form than that of FIG. 2. In FIG. 4, the free ends 6, 7 of the side walls 4, 5 are each folded inside the bag 1. It's tuned.
In FIG. 5, the free end 6 is bent outside the bag 1 and the free end 7 is bent inside. The bag 1 of FIG. 4 can be sealed by putting the free end 6 in the pocket 16. The bag 1 shown in FIG. 5 may be sealed as shown in FIG. 3 or as shown in FIG.

FIG. 6 is a cross-sectional view of the upper end portion of the bag 1 when the bag 1 of various modes shown in FIGS. 2, 4 and 5 is sealed. (1) of the figure shows the case of the bag 1 of FIG. 2, in which the free end portion 6 is interposed between the side wall 4 and the free end portion 7. When the bag 1 is inflated by the tea leaf 25, the free end portion 6 is sandwiched between the side wall 4 and the free end portion 7, and the tea leaf 25 does not easily come out. Such an effect is also obtained when the free end 6 is put in the pocket 16 in the bag 1 of FIG. (2) and (3) of the figure show the case of the bag 1 of FIG. 4, in which the free end 6 put in the pocket 16 approaches the inner surface of the side wall 4 and approaches the side wall 5. There is. In any case, since the effect of firmly closing the mouth of the bag 1 as shown in (1) of the figure cannot be obtained, the tea leaves 25 are relatively easy to go out.

In the present invention, it is preferable to use a non-woven fabric for the bag 1, but a liquid-permeable woven fabric, a net-shaped plastic sheet or the like can be used instead. To bond these non-woven fabrics and the like, an adhesive such as a hot melt type adhesive can be used, or a welding technique for a hot melt material can be used. The bag 1 can be widely used as a filter for not only the case where tea is put and the soup stock is taken but also other work for the purpose of extraction. The present invention can be carried out without the widthwise joining line 11 shown in FIG.

[0015]

According to the present invention, since the opening edge of the filter bag spreads like a funnel, it becomes easy to put tea leaves or the like into the bag. At such an opening edge portion, since the free end portion of the sheet such as a non-woven fabric forming a bag is folded, the edge portion is relatively stiff and its shape is stable when it spreads in a funnel shape. Helps improve ease of insertion.

[Brief description of drawings]

FIG. 1 is a perspective view of a bag.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a plan view of the sealed bag.

FIG. 4 is a sectional view of a bag different from the embodiment of FIG.

FIG. 5 is a sectional view of a bag different from the modes of FIGS.

FIG. 6 is an upper end view of the sealed bag, which includes (1) to
(3) shows the behavior of the sealing in different modes.

[Explanation of symbols]

 1 bag 4,5 sheet (side wall part) 6,7 end part 8 upper end 11 second joining line (width direction joining line) 16,17 pocket

Claims (5)

[Claims] 1. A bottomed filter bag having an opening at its upper end formed by joining left and right side edges of overlapping first and second liquid-permeable sheets to each other. The front end of each of the two sheets is bent toward the lower end of the bag at the upper end of the bag to form the first and second sheets.
A downward pocket is formed by joining the left and right side edges of the unfolded portion of the first sheet, and the side edges of each of the first and second sheets from the vicinity of the upper end of the bag. The first and second portions are joined to each other in the range up to the lower end and are in the unjoined range from the vicinity of the upper end to the upper end.
The bag wherein each portion of the sheet of the above forms an open end that is separable from each other. 2. The bag according to claim 1, wherein a tip portion of each of the overlapping sheets is bent to the outside of the bag. 3. The bag according to claim 1, wherein a leading end portion of each of the overlapping sheets is bent inside the bag. 4. The bag according to claim 1, wherein one end of each of the overlapping sheets is folded back to the outside of the bag and the other is folded back to the inside of the bag. 5. The side edges of the first and second sheets are joined at joining lines extending in the up-down direction of the bag formed inside the side edges, and the first and second sheets are joined together. The bag according to any one of claims 1 to 4, wherein the sheet connects the respective side edges to the upper end portion of the joining line and is joined also at a second joining line extending in the left-right direction of the bag.