JP3990969B2

JP3990969B2 - Filter bag

Info

Publication number: JP3990969B2
Application number: JP2002314258A
Authority: JP
Inventors: 常雄青木
Original assignee: 株式会社トキワ工業
Priority date: 2002-10-29
Filing date: 2002-10-29
Publication date: 2007-10-17
Anticipated expiration: 2022-10-29
Also published as: JP2004149132A

Description

【０００１】
【発明の属する技術分野】
この発明は、茶葉、コーヒー粉末等からお茶やコーヒーを抽出するときに使用するのに好適なフィルター用の袋に関する。
【０００２】
【従来の技術】
従来、この種のフィルター用の袋として、熱可塑性合成繊維からなる透液性の不織布や熱可塑性合成樹脂からなる透液性の開孔プラスチックフィルム等の透液性のシートからなる袋本体と取り出し用のひもとによって形成されているものが知られている（例えば、特許文献１参照。）。特許文献１に記載のフィルター用の袋は、専ら削り節や煮干しを煮出すときに使用するもので、２枚のシートが上端縁部どうしで開口を形成し、２枚のうちの一方のシートの外側には上端縁部から下端縁部に向かっての折り返し部分が設けられている。この袋は、折り返し部分を裏返すと開口を閉じることができる。開口が閉じた袋は、湯の中でも開口が容易に開かず、また取り出し用のひもを箸などで引っ掛けてこれを鍋等から取り出すときにも袋の開口が大きく開くことがなく、袋から内容物が漏れるのを防止できるようにしたものであった。
【０００３】
【特許文献１】
特開２００２−１９３２７７号公報
【０００４】
【発明が解決しようとする課題】
特許文献１に記載されたフィルター用の袋は、茶葉やコーヒー粉末を入れ、ポットなどから湯を袋の開口に注ぎ、茶葉やコーヒー粉末を好みの状態で抽出しようとする使用には適さなかった。その理由は、このフィルター用の袋では、折り返し部分を裏返せば開口が閉じてしまい、また折り返し部分を裏返さず、開口が閉じない状態で使用しようとしても、開口が十分に開かず、ポットなどからの湯を袋の開口にうまく注げないということがあったからである。
【０００５】
この発明が目的とするのは、茶葉やコーヒー粉末などを入れた後にポットなどからの湯を注ぐことが容易なように開口が十分に大きく開くフィルター用の袋の提供である。
【０００６】
【課題を解決するための手段】
前記課題を解決するための本発明の前提は、矩形を呈し少なくとも一方が透液性を有する第１シートと第２シートとが重なり合い、これら両シートの側縁部どうしおよび下端縁部どうしが一体化し、上端縁部側に開口が形成されたフィルター用の袋である。
【０００７】
かかる前提において、この発明が特徴とするところは、次のとおりである。前記第２シートが、前記第１シートの上端縁部を越えてさらに上方へ延びる突出部を有し、前記開口が、前記第１シートの前記上端縁部と該上端縁部に向かい合う前記第２シートとで形成され、前記突出部の外面側には前記第２シートの上端縁部から前記下端縁部へ向かって延びる折り返し部が設けられ、前記折り返し部の側縁部それぞれが、前記第２シートの側縁部外面に一体化するとともに、前記第２シートの前記上端縁部近傍の部位では前記外面から離間しており、前記袋の幅方向へ延びるひもが前記部位それぞれに挿通されて前記第２シートと前記折り返し部との間に延在するとともに、前記ひもの両端部が前記折り返し部の外側で連結された状態にある。
【０００８】
この発明の実施の態様の一例として、前記折り返し部の剛性が、前記第２シートにおける前記突出部のそれより大きい。また、この発明の実施の態様の他の例として、前記折り返し部における上下方向の長さは、前記第２シートの前記突出部の上下方向の長さにほぼ等しくされている。
【０００９】
【発明の実施の形態】
添付の図面を参照し、この発明に係るフィルター用の袋の詳細を説明すると、以下のとおりである。
【００１０】
図１は、第１実施形態に係るフィルター用の袋１の部分破断斜視図、図２は、図１のＩＩ−ＩＩ線断面図である。フィルター用の袋１は、熱可塑性合成繊維からなる透液性の不織布や熱可塑性合成樹脂からなる透液性の開孔プラスチックフィルム等の透液性のシート２からなる袋本体３と吊り下げ用のひも４とによって形成されている。図示例の袋本体３は、第１シートからなる前面部５と、第２シートからなる後面部６と、折り返し部１０とから構成されている。この袋本体３は、１枚のシート２を折り重ねて形成された矩形のもので、前面部５の下端縁部でシート２を折り返して後面部６が形成され、後面部６の上端縁部６ａでシート２を袋１の外側へさらに折り返して折り返し部１０が形成されている。
【００１１】
前面部５と後面部６とは、側縁部どうしが接合線８で溶着一体化されて袋状にされ、前，後面部５，６の下端縁部には底部７が形成され、上端縁部側には開口９が形成されている。後面部６は、前面部５の上端縁部５ａを越えて底部７とは反対の上方向へ延びている。開口９は、前面部５の上端縁部５ａとそれが向かい合う後面部６の内面とで形成されている。
【００１２】
折り返し部１０は、後面部６の上端縁部６ａから第２シートの外面側へ底部７に向かって延びている。折り返し部１０の上下方向の長さは、後面部６において前面部５の上端縁部５ａからそれを越えて上方へ上端縁部６ａまで延びている突出部６ｂの上下方向の長さとほぼ同じである。
【００１３】
前面部５では、シート２が開口９の縁である上端縁部５ａから袋本体３の内側へ底部７に向かって折り返されている。この折り返された部分５ｂと、これが重なるシート２との内面どうしが幅方向に溶着一体化され、前面部５の上端縁部５ａ付近が補強されている。
【００１４】
図３は、図１のＩＩＩ−ＩＩＩ線に沿う袋１の断面図であって、接合線８の断面形状を示す。接合線８ではシート２の重なり合う部分が溶融一体化しているが、図３には溶融する以前のそれら部分の存在が鎖線によって明らかにされている。接合線８は、底部７から延びて開口９へ至り、前面部５の側縁部と後面部６の側縁部どうしを溶着一体化しているとともに、開口９を越えて後面部６の突出部６ｂへ延び、突出部６ｂの側縁部と折り返し部１０の側縁部どうしも溶着一体化している。この接合線８は、後面部６の上端縁部６ａの手前で終わり、接合線８の上端１１と後面部６の上端縁部６ａとの間の部位１２（図１参照）では、後面部６と折り返し部１０とが非接合状態にある。
【００１５】
接合線８の上端１１と後面部６の上端縁部６ａとの間には、後面部６と折り返し部１０とが環状部１５を形成し、その内側には一条のひも４が納まっている。すなわち、ひも４は、後面部６と折り返し部１０との間にあって後面部６の非接合状態にある両側縁部に向かって延び、部位１２において後面部６と折り返し部１０との間から外へ出た両端部４ａ，４ｂが図１に示されるように折り返し部１０の外で結ばれて環を形成している。ひも４は、後面部６や折り返し部１０によって拘束されることがなく、双頭矢印１３（図１参照）方向へ動かすことができる。
【００１６】
図４〜６は、袋本体３に開口９から茶葉やコーヒー粉末(図示せず)を入れた後、その袋本体３の開口９からお湯を注ぐ準備をするまでの手順を示す袋１の斜視図である。図４〜６のうち、図５は、図４の袋１を矢印IVの方向から見たときの斜視図である。茶葉やコーヒー粉末を入れた袋本体３は、図１において、後面部６の上方角部１６が仮想線で示された折曲線１７に沿って矢印１８方向へ、後面部６の突出部６ｂどうしが重なるように折曲されて図４の状態となる。図１，２で上方へ延びていたひも４は、下方へ延びるようにその向きを変える。
【００１７】
図５に示される袋本体３の折り返し部１０が矢印１９方向ヘ、即ち折り返し部１０が前面部５へ向かって裏返しにされて図６の状態となる。この状態では、後面部６と折り返し部１０との間に隠れていたひも４の上方部分４ｃが露出する。折り返し部１０の上下方向の長さは、後面部６の突出部６ｂのそれとほぼ同じであるので、前面部５へ向かって裏返しにされた折り返し部１０が開口９を塞ぐことはなく、また開口９が大きく開けば湯を開口９に注ぐときに邪魔になることはない。
【００１８】
この袋１をコーヒーカップ等の容器（図示せず）内に入れて、露出したひも４の上方部分４ｃを引っ張ると、ひも４の下方部分４ｄは図６で見て左右方向における環の幅が次第に減少し、やがて袋本体３の上方角部１６，１６を矢印２０，２１方向へ動かして図６に仮想線で示すように互いに接近させる。
【００１９】
上方角部１６，１６どうしのこのような接近は、後面部６の上端縁部６ａにおける両側縁部間の距離を縮め、図６に仮想線６ｃで示すように後面部６の上端縁部６ａを前面部５とは反対側へ凸状に湾曲させると同時に前面部５の上端縁部５ａを後面部６とは反対側へ凸状に湾曲させて袋本体３の開口９が大きく開くように作用する。コーヒーカップ等の容器内に入れた袋１の開口９を、このようにして大きく開くことができるので、前面部５へ向かって裏返しにされた折り返し部１０に邪魔されることなく、その開口９から容易にお湯を注ぎ入れることができる。特に、袋本体３に入れられた茶葉やコーヒー粉末が少量であっても開口９を十分に大きく開くことができるので、その開口９から容易にお湯を注ぎ入れることができる。
【００２０】
図７は、第２実施形態に係るフィルター用の袋２０の部分破断斜視図、図８は、図７のＶＩＩＩ−ＶＩＩＩ線断面図である。図７，８に示す袋２０において、図１，２に示す袋１と同一又は相当する構成部分には同一の参照符号を付けてその説明を省略する。この袋２０が袋１と相違する点は、折り返し部１０の構成にある。この袋２０では、折り返し部１０が、シート２を後面部６の上端縁部６ａで折り返し、さらに下端縁部１０ａで後面部６の外面に向かい合う面の側に上方向へ向かって折り返えすことにより２枚重ねにして形成されている。
【００２１】
折り返し部１０の下端縁部１０ａで折り返されたシート２は、上端縁部６ａの近傍における後面部６に重ねられて終わっている。このシート２の終端部１０ｃは、それが重ね合わされるシート２（上端縁部６ａ近傍における後面部６）にその幅方向に溶着一体化されている。このように、袋２０では、折り返し部１０が、シート２を２枚重ねにして形成されているので、その剛性が突出部６ｂのそれより高い。
【００２２】
袋２０では、袋１の場合と同様に、茶葉やコーヒー粉末を袋本体３に入れた後、後面部６の上方角部１６を折曲線１７に沿って折曲し、次いで袋本体３の折り返し部１０が前面部５へ向かって裏返しにされる。この袋２０をコーヒーカップ等の容器（図示せず）内に入れて、ひも４の上方部分４ｃを引っ張ると、ひも４の下方部分４ｄにおける環の幅が次第に減少し、やがて袋本体３の上方角部１６，１６を互いに接近させるように動かす。このときの袋２０の形態は、図６に示す袋１の形態と同じである。この図６を参照して説明すると、ひも４を引っ張るとき、その引っ張り方向によっては、上方角部１６，１６が折曲線１７を軸にして突出部６ｂから離れる方向へ旋回しようとする場合がある。上方角部１６，１６は、前面部５へ向かって裏返しにされた折り返し部１０と突出部６ｂとの間に位置しており、折り返し部１０の剛性が突出部６ｂのそれより大きい。ゆえに、旋回しようとする上方角部１６，１６の動きは、折り返し部１０により規制され、かような上方角部１６，１６の動きは阻止され、ひも４を袋本体３に対して斜め上方から引っ張っても上方角部１６，１６を相互接近させることができる。
【００２３】
この発明は、図示例の袋１，２０の他に、例えば前面部５と、後面部６と、折り返し部１０とが異質のシートからなる袋本体３や底部７にまちを付けた袋本体３を使用して構成することも可能である。また、この発明において、袋本体３は前面部５と後面部６とのうちのいずれかが透液性であればよい。
【００２４】
【発明の効果】
この発明に係るフィルター用の袋は、茶葉やコーヒー粉末などを入れた袋本体をコーヒーカップなどの容器内に配置しても、開口を十分に開いた状態に維持することができ、ポットなどからの湯を袋の開口に容易に注ぎ入れることができる。
【図面の簡単な説明】
【図１】第１実施形態に係るフィルター用の袋の部分破断斜視図。
【図２】図１のＩＩ−ＩＩ線断面図。
【図３】図１のＩＩＩ−ＩＩＩ線断面図。
【図４】角部が折曲された状態のフィルター用の袋の斜視図。
【図５】図４の袋の後面斜視図。
【図６】折り返し部が前面部側へ裏返しにされた状態の部分破断斜視図。
【図７】第２実施形態に係るフィルター用の袋の部分破断斜視図。
【図８】図７のＶＩＩＩ−ＶＩＩＩ線断面図。
【符号の説明】
１，２０フィルター用の袋
２シート
３袋本体
４ひも
４ａ，４ｂひもの両端部
５前面部（第１シート）
５ａ前面部の上端縁部
６後面部（第２シート）
６ａ後面部の突出部
６ｂ後面部の上端縁部
７底部（下端縁部）
８接合線
９開口部
１０折り返し部
１２部位[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a filter bag suitable for use when extracting tea or coffee from tea leaves, coffee powder or the like.
[0002]
[Prior art]
Conventionally, as a bag for this type of filter, a bag body made of a liquid permeable sheet such as a liquid permeable nonwoven fabric made of thermoplastic synthetic fiber or a liquid permeable open plastic film made of thermoplastic synthetic resin is taken out. What is formed with the string for use is known (for example, refer patent document 1). The filter bag described in Patent Document 1 is used exclusively when boiling shavings and dried sardines, and two sheets form an opening between upper edge portions, and one of the two sheets. On the outer side, a folded portion from the upper end edge toward the lower end edge is provided. The bag can be closed when the folded portion is turned over. Opened bags do not open easily even in hot water, and the bag opening does not open greatly when the take-out string is hooked with chopsticks and removed from the pan, etc. It was designed to prevent things from leaking.
[0003]
[Patent Document 1]
JP 2002-193277 A [0004]
[Problems to be solved by the invention]
The filter bag described in Patent Document 1 is not suitable for use in which tea leaves or coffee powder is put, hot water is poured from a pot or the like into the opening of the bag, and tea leaves or coffee powder is extracted in a desired state. . The reason for this is that in this filter bag, if the folded part is turned over, the opening will be closed, and if the folded part is not turned over and the opening is not closed, the opening will not open sufficiently and the pot etc. This is because it was difficult to pour hot water from the bag into the opening of the bag.
[0005]
An object of the present invention is to provide a filter bag whose opening is sufficiently large so that hot water from a pot or the like can be easily poured after putting tea leaves or coffee powder.
[0006]
[Means for Solving the Problems]
The premise of the present invention for solving the above-mentioned problem is that the first sheet and the second sheet, which are rectangular and at least one of which is liquid permeable, overlap each other, and the side edges and the lower edges of both sheets are integrated. This is a filter bag in which an opening is formed on the upper edge portion side.
[0007]
Based on this premise, the present invention is characterized as follows. The second sheet has a protrusion that extends further upward beyond the upper edge of the first sheet, and the opening faces the upper edge of the first sheet and the second edge of the second sheet. A folding portion extending from an upper end edge portion of the second sheet toward the lower end edge portion is provided on an outer surface side of the projecting portion, and each of the side edge portions of the folding portion is the second edge portion. The sheet is integrated with the outer surface of the side edge of the sheet, and is separated from the outer surface at a portion near the upper edge of the second sheet, and a string extending in the width direction of the bag is inserted through each of the portions. While extending between a 2nd sheet | seat and the said folding | returning part, it exists in the state which the both ends of the said string were connected on the outer side of the said folding | returning part.
[0008]
As an example of an embodiment of the present invention, the folded portion has a rigidity higher than that of the protruding portion of the second sheet. As another example of an embodiment of the present invention, the vertical length of the folded portion is substantially equal to the vertical length of the protruding portion of the second sheet.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The details of the filter bag according to the present invention will be described with reference to the accompanying drawings.
[0010]
FIG. 1 is a partially broken perspective view of a filter bag 1 according to the first embodiment, and FIG. 2 is a sectional view taken along line II-II in FIG. The filter bag 1 includes a bag body 3 made of a liquid permeable sheet 2 such as a liquid permeable nonwoven fabric made of thermoplastic synthetic fibers and a liquid permeable open plastic film made of thermoplastic synthetic resin. The string 4 is formed. The illustrated bag body 3 includes a front surface portion 5 made of a first sheet, a rear surface portion 6 made of a second sheet, and a folded portion 10. This bag body 3 is a rectangular shape formed by folding a single sheet 2, and a rear surface portion 6 is formed by folding the sheet 2 at the lower end edge of the front surface portion 5, and the upper end edge portion of the rear surface portion 6. The sheet | seat 2 is further folded back to the outer side of the bag 1 by 6a, and the folding | returning part 10 is formed.
[0011]
The front surface portion 5 and the rear surface portion 6 are welded and integrated with each other at a joining line 8 to form a bag, and a bottom portion 7 is formed at the lower end edge portions of the front and rear surface portions 5 and 6, and an upper end edge. An opening 9 is formed on the part side. The rear surface portion 6 extends in the upward direction opposite to the bottom portion 7 beyond the upper edge 5 a of the front surface portion 5. The opening 9 is formed by the upper end edge portion 5a of the front surface portion 5 and the inner surface of the rear surface portion 6 facing it.
[0012]
The folded portion 10 extends from the upper edge 6a of the rear surface portion 6 toward the bottom portion 7 toward the outer surface side of the second sheet. The vertical length of the folded portion 10 is substantially the same as the vertical length of the protruding portion 6b extending from the upper edge 5a of the front surface 5 to the upper edge 6a in the rear surface 6 beyond the upper edge 5a. is there.
[0013]
In the front surface portion 5, the sheet 2 is folded back toward the bottom portion 7 from the upper edge portion 5 a that is the edge of the opening 9 to the inside of the bag body 3. The inner surfaces of the folded portion 5b and the sheet 2 on which the folded portion 5 overlaps are welded and integrated in the width direction, and the vicinity of the upper end edge portion 5a of the front surface portion 5 is reinforced.
[0014]
FIG. 3 is a cross-sectional view of the bag 1 taken along the line III-III in FIG. In the joining line 8, the overlapping portions of the sheet 2 are fused and integrated, but in FIG. 3, the existence of those portions before melting is revealed by a chain line. The joining line 8 extends from the bottom portion 7 to the opening 9, and the side edge portion of the front surface portion 5 and the side edge portion of the rear surface portion 6 are welded and integrated, and the protruding portion of the rear surface portion 6 passes through the opening 9. It extends to 6b, and the side edge part of the protrusion part 6b and the side edge part of the folding | returning part 10 are welding-integrated. This joining line 8 ends before the upper end edge 6a of the rear surface part 6, and the rear surface part 6 is located at a portion 12 (see FIG. 1) between the upper end 11 of the joining line 8 and the upper edge 6a of the rear surface part 6. And the folded portion 10 are in a non-joined state.
[0015]
Between the upper end 11 of the joining line 8 and the upper end edge 6a of the rear surface portion 6, the rear surface portion 6 and the folded portion 10 form an annular portion 15, and a single string 4 is housed inside the annular portion 15. That is, the string 4 extends between the rear surface portion 6 and the folded portion 10 toward both side edges in the non-bonded state of the rear surface portion 6, and from the portion 12 to the outside from between the rear surface portion 6 and the folded portion 10. The two ends 4a and 4b that have come out are connected outside the folded portion 10 as shown in FIG. 1 to form a ring. The string 4 can be moved in the direction of the double-headed arrow 13 (see FIG. 1) without being constrained by the rear surface portion 6 or the folded portion 10.
[0016]
FIGS. 4 to 6 are perspective views of the bag 1 showing a procedure from putting tea leaves or coffee powder (not shown) into the bag body 3 through the opening 9 and preparing for pouring hot water from the opening 9 of the bag body 3. FIG. 4-6, FIG. 5 is a perspective view when the bag 1 of FIG. 4 is seen from the direction of arrow IV. The bag body 3 containing tea leaves or coffee powder is shown in FIG. 1 in which the upper corner portion 16 of the rear surface portion 6 extends in the direction of the arrow 18 along the folding line 17 indicated by an imaginary line between the protruding portions 6b of the rear surface portion 6. Are folded so that they overlap each other, and the state shown in FIG. 4 is obtained. The string 4 extending upward in FIGS. 1 and 2 changes its direction so as to extend downward.
[0017]
The folded portion 10 of the bag body 3 shown in FIG. 5 is turned in the direction of the arrow 19, that is, the folded portion 10 is turned over toward the front surface portion 5, and the state shown in FIG. 6 is obtained. In this state, the upper portion 4c of the string 4 hidden between the rear surface portion 6 and the folded portion 10 is exposed. Since the length of the folded portion 10 in the vertical direction is substantially the same as that of the protruding portion 6 b of the rear surface portion 6, the folded portion 10 turned upside down toward the front surface portion 5 does not block the opening 9. If 9 is opened wide, it does not get in the way when hot water is poured into the opening 9.
[0018]
When this bag 1 is put in a container (not shown) such as a coffee cup and the upper part 4c of the exposed string 4 is pulled, the lower part 4d of the string 4 has a ring width in the left-right direction as viewed in FIG. It gradually decreases and eventually the upper corners 16 and 16 of the bag body 3 are moved in the directions of the arrows 20 and 21 so as to approach each other as indicated by phantom lines in FIG.
[0019]
Such approach between the upper corners 16 and 16 reduces the distance between both side edges of the upper edge 6a of the rear surface 6, and the upper edge 6a of the rear surface 6 as shown by an imaginary line 6c in FIG. Is curved convexly to the opposite side of the front surface portion 5 and at the same time the upper edge 5a of the front surface portion 5 is curved convexly to the opposite side of the rear surface portion 6 so that the opening 9 of the bag body 3 is wide open. Works. Since the opening 9 of the bag 1 placed in a container such as a coffee cup can be greatly opened in this way, the opening 9 is not obstructed by the folded portion 10 turned upside down toward the front surface portion 5. Hot water can be poured easily from. In particular, since the opening 9 can be opened sufficiently large even with a small amount of tea leaves or coffee powder contained in the bag body 3, hot water can be easily poured from the opening 9.
[0020]
FIG. 7 is a partially broken perspective view of the filter bag 20 according to the second embodiment, and FIG. 8 is a sectional view taken along line VIII-VIII in FIG. In the bag 20 shown in FIGS. 7 and 8, the same or corresponding components as those in the bag 1 shown in FIGS. The bag 20 is different from the bag 1 in the configuration of the folded portion 10. In this bag 20, the folded portion 10 folds the sheet 2 at the upper end edge 6 a of the rear surface portion 6, and further folds upward at the lower end edge portion 10 a toward the surface facing the outer surface of the rear surface portion 6. Is formed by overlapping two sheets.
[0021]
The sheet 2 folded at the lower end edge portion 10a of the folded portion 10 is overlaid on the rear surface portion 6 in the vicinity of the upper end edge portion 6a. The end portion 10c of the sheet 2 is welded and integrated in the width direction with the sheet 2 (the rear surface portion 6 in the vicinity of the upper edge 6a) on which the end portion 10c is superimposed. Thus, in the bag 20, since the folding | returning part 10 is formed with two sheets 2 piled up, the rigidity is higher than that of the protrusion part 6b.
[0022]
In the bag 20, as in the case of the bag 1, after putting tea leaves or coffee powder into the bag body 3, the upper corner 16 of the rear surface part 6 is bent along the folding line 17, and then the bag body 3 is folded back. The part 10 is turned over toward the front part 5. When this bag 20 is put in a container (not shown) such as a coffee cup and the upper part 4c of the string 4 is pulled, the width of the ring in the lower part 4d of the string 4 gradually decreases, and eventually the upper part of the bag body 3 The direction portions 16 and 16 are moved so as to approach each other. The form of the bag 20 at this time is the same as the form of the bag 1 shown in FIG. Referring to FIG. 6, when the string 4 is pulled, depending on the pulling direction, the upper corners 16, 16 may attempt to turn away from the protruding part 6 b around the folding line 17. . The upper corners 16 and 16 are located between the folded part 10 turned over toward the front part 5 and the protruding part 6b, and the rigidity of the folded part 10 is larger than that of the protruding part 6b. Therefore, the movement of the upper corners 16, 16 to be swiveled is restricted by the turn-up unit 10, and the movement of the upper corners 16, 16 is prevented, and the string 4 is obliquely upward with respect to the bag body 3. Even when pulled, the upper corners 16, 16 can be brought close to each other.
[0023]
In the present invention, in addition to the bags 1 and 20 shown in the figure, for example, the front body 5, the rear surface 6, and the folded section 10 are made of a bag body 3 made of a different sheet, and the bag body 3 with a bottom 7 attached with a town. It is also possible to configure using Moreover, in this invention, the bag main body 3 should just be liquid-permeable in either the front-surface part 5 or the rear surface part 6. FIG.
[0024]
【The invention's effect】
The filter bag according to the present invention can maintain the opening sufficiently opened even when the bag body containing tea leaves or coffee powder is placed in a container such as a coffee cup. Can be poured easily into the bag opening.
[Brief description of the drawings]
FIG. 1 is a partially broken perspective view of a filter bag according to a first embodiment.
2 is a cross-sectional view taken along the line II-II in FIG.
3 is a cross-sectional view taken along line III-III in FIG.
FIG. 4 is a perspective view of a filter bag with corners bent.
5 is a rear perspective view of the bag of FIG. 4. FIG.
FIG. 6 is a partially broken perspective view in a state in which the folded portion is turned over to the front side.
FIG. 7 is a partially cutaway perspective view of a filter bag according to a second embodiment.
8 is a cross-sectional view taken along line VIII-VIII in FIG.
[Explanation of symbols]
1,20 Filter bag 2 Sheet 3 Bag body 4 String 4a, 4b String ends 5 Front section (first sheet)
5a Front edge 6 of the front surface 6 Rear surface (second sheet)
6a Rear surface protrusion 6b Rear surface upper edge 7 Bottom (lower edge)
8 Joining line 9 Opening 10 Folding part 12 Site

Claims

A first sheet and a second sheet that are rectangular and at least one of which is permeable to liquid, the side edges and bottom edges of these sheets are integrated, and an opening is formed on the top edge. In the bag for
The second sheet has a protrusion extending further upward beyond the upper edge of the first sheet;
The opening is formed by the upper edge portion of the first sheet and the second sheet facing the upper edge portion, and the outer surface side of the projecting portion extends from the upper edge portion of the second sheet to the lower edge portion. Folding portions extending toward the side are provided, and each side edge of the folding portion is integrated with the outer surface of the side edge portion of the second sheet, and the outer surface at a portion near the upper edge of the second sheet. A string extending in the width direction of the bag is inserted through each of the portions and extends between the second sheet and the folded portion, and both ends of the string are outside the folded portion. The filter bag, wherein the filter bag is connected to each other.

The bag according to claim 1, wherein rigidity of the folded portion is larger than that of the protruding portion of the second sheet.

The said bag of Claim 1 or 2 with which the length of the up-down direction in the said folding | turning part is substantially equal to the length of the up-down direction of the said protrusion part of the said 2nd sheet | seat.