JPH08209600A - Cylindrical unit comprising fiber material and its production - Google Patents

Abstract

PURPOSE: To provide a method for producing a cylindrical unit capable of preventing trouble such as cracking from arising in forming the cylindrical unit from a platy material and further producing thereof in a uniform wall thickness in the cylindrical unit formed by joining both side edges of the platy material comprising a fibrous material. CONSTITUTION: This cylindrical unit is formed by joining both side edges of a platy material 2 while folding back the platy material 2 comprising a fibrous material in the form prepared by connectedly arranging three arclike cross-sectional curved parts 3, 4 and 5 side by side in the width direction at positions of a fold 6 between the curved parts 3 and 4 and a fold 7 between the curved parts 4 and 5 in the curving direction. The platy material 2 is prepared by pressing a suspension containing the dispersed fibrous material between a bottom force 12 and a top force 13 while removing water therefrom and thereby integrally molding the platy material. The arc length of the protruding ridge molding surface 16 of the bottom force 12 corresponding to the curved part 4 in the center of the platy material 2 is shortened so as to be nearly flat.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、古紙等を原材料とする
パルプ繊維等の繊維材料から成る円筒体及びその製造方
法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical body made of fibrous material such as pulp fiber made of waste paper as a raw material and a method for producing the cylindrical body.

【０００２】[0002]

【従来の技術】近年、資源の有効利用の観点から、古紙
の再生利用が進められている。この古紙の再生利用にお
いては、まず、古紙を裁断して水に溶かすことにより、
繊維材料としてのパルプ繊維を分散した懸濁液（以下、
パルプ液という）が製造され、そのパルプ液から適当な
加工工程を経て種々の紙製品が製造される。該パルプ液
には、必要に応じてヴァ─ジンパルプが添加される場合
もある。2. Description of the Related Art In recent years, recycling of used paper has been promoted from the viewpoint of effective use of resources. In recycling this used paper, first cut the used paper and dissolve it in water.
A suspension in which pulp fibers as a fiber material are dispersed (hereinafter,
Pulp liquor) is produced, and various paper products are produced from the pulp liquor through appropriate processing steps. If necessary, virgin pulp may be added to the pulp liquid.

【０００３】ところで、紙製品にあっては、円筒形状の
ものが、剛性上の利点等の大きいことから各種産業分野
における利用性が比較的高い。そして、このような円筒
体を製造する場合、従来は、薄膜帯状の紙帯を用い、そ
れを棒状のものに巻回していくことにより前記円筒体を
製造するのが一般的である。By the way, as for paper products, cylindrical products are relatively high in applicability in various industrial fields because of great advantages in rigidity and the like. In the case of manufacturing such a cylindrical body, conventionally, the cylindrical body is generally manufactured by using a thin paper strip-shaped paper strip and winding it around a rod-shaped strip.

【０００４】しかしながら、このような円筒体の製造方
法では、多くの加工工程が必要となって、製造効率が悪
く、また、コスト的にも不利なものとなり易い。However, such a method of manufacturing a cylindrical body requires many processing steps, resulting in poor manufacturing efficiency and a disadvantage in terms of cost.

【０００５】このため、本願発明者等は、古紙を再利用
するためにパルプ液を用い、図７に示すように、円筒体
を縦割２分割してなる二つの半円筒体ａ，ａを幅方向に
並列させて連設した形の板材ｂを、下型ｃ及び上型ｄを
備えた金型を用いて前記パルプ液から一体成形し、次い
で、前記半円筒体ａ，ａの連設箇所を折り目部ｅとし
て、同図矢印Ｘで示すように板材ｂを折り返し、該板材
ｂの両側縁を接合することにより、円筒体を製造するこ
とを試みた。この場合、下型ｃには、半円筒体ａ，ａに
対応した凸条成形面ｆ，ｆが設けられ、該成形面ｆ，ｆ
上に前記パルプ液を付着させる。そして、その後に、下
型ｃの成形面ｆ，ｆと嵌合する凹条成形面ｇ，ｇを有す
る上型ｄを下型ｃに嵌合させて加圧し、この状態で前記
パルプ液中から水分を吸引除去したり、加熱することに
より、下型ｃ及び上型ｄ間に前記板材ｂを成形する。For this reason, the inventors of the present application used a pulp liquid to reuse the waste paper and, as shown in FIG. 7, form two semi-cylindrical bodies a, a which are obtained by vertically dividing the cylindrical body into two. A plate material b having a shape of being arranged in parallel in the width direction is integrally formed from the pulp liquid by using a mold having a lower mold c and an upper mold d, and then the semicylindrical bodies a and a are continuously arranged. An attempt was made to manufacture a cylindrical body by folding back the plate material b as shown by the arrow X in the figure and joining the both side edges of the plate material b with the fold points e. In this case, the lower mold c is provided with ridge forming surfaces f, f corresponding to the semi-cylindrical bodies a, a.
The pulp liquid is attached on top. Then, thereafter, the upper mold d having the grooved molding surfaces g, g that fit with the molding surfaces f, f of the lower mold c is fitted into the lower mold c and pressurized, and in this state, from the pulp liquid. The plate material b is formed between the lower mold c and the upper mold d by removing water by suction or heating.

【０００６】しかしながら、かかる手法は、次のような
不都合を生じるものであった。However, this method has the following disadvantages.

【０００７】すなわち、前記下型ｃの各凸条成形面ｆ
は、断面半円弧状であるため、その両側面がほぼ垂直な
急斜面となる。そして、前記パルプ液は水分を含む液質
状のものであるため、各凸条成形面ｆに付着されるパル
プ液の水分はパルプ繊維と共に、各凸条成形面ｆの頂部
からその両側に流動し易い。このため、特に凸条成形面
ｆ，ｆの間の箇所にあっては、その両側の凸条成形面
ｆ，ｆからパルプ繊維が流動し、多くのパルプ繊維が溜
まり易い。この状態で、前記上型ｄとの間で前記板材ｂ
を成形すると、凸条成形面ｆ，ｆの間の箇所（板材ｂの
折り目部ｅの箇所）で、該板材ｂの肉厚が他の箇所に較
べて厚くなり、その結果、該板材ｂから形成される円筒
体の肉厚が不均一なものとなってしまう。That is, each convex strip forming surface f of the lower mold c
Has a semi-circular cross section, and therefore both side surfaces are steep slopes that are substantially vertical. Since the pulp liquid is a liquid containing water, the water content of the pulp liquid attached to each of the ridge forming surfaces f flows from the top of each ridge forming surface f to both sides thereof together with the pulp fibers. Easy to do. For this reason, particularly at the location between the ridge forming surfaces f, f, the pulp fibers flow from the ridge forming surfaces f, f on both sides thereof, and a large amount of pulp fibers are likely to accumulate. In this state, the plate material b between the upper die d
Is formed, the thickness of the plate material b becomes thicker at a portion between the ridge forming surfaces f (the portion of the fold portion e of the plate material b) than other portions, and as a result, from the plate material b. The thickness of the formed cylindrical body becomes uneven.

【０００８】また、上記のように特に肉厚が厚くなる箇
所は、板材ｂの折り目部ｅであると共に、該折り目部ｅ
で板材ｂを折り返して円筒体を形成する際の折り返し角
度は、１８０°の大きな角度であるため、その折り返し
の際に、板材ｂの折り目部ｅの箇所で亀裂が生じやす
い。Further, the portion where the wall thickness becomes particularly thick as described above is the fold portion e of the plate material b and the fold portion e.
Since the folding angle when the plate material b is folded back to form a cylindrical body is a large angle of 180 °, cracks are likely to occur at the fold points e of the plate material b during the folding back.

【０００９】さらに、前記上型ｄにあっては、その凹条
成形面ｇ，ｇの間の箇所ｈが非常に鋭角的なものとなる
ため、破損を生じやすい。Further, in the upper mold d, the portion h between the concave line molding surfaces g has a very acute angle, so that the upper mold d is easily damaged.

【００１０】[0010]

【発明が解決しようとする課題】本発明はパルプ繊維等
の繊維材料から成る板材の両側縁を接合して形成される
円筒体において、該板材から円筒体を形成する際に亀裂
等の不都合を生じるのを防止することができる円筒体を
提供することを目的とする。DISCLOSURE OF THE INVENTION The present invention provides a cylindrical body formed by joining both side edges of a plate material made of a fiber material such as pulp fiber. When the cylindrical body is formed from the plate material, problems such as cracks occur. It is an object of the present invention to provide a cylindrical body which can be prevented from occurring.

【００１１】また、本発明は均一な肉厚の円筒体を容易
且つ良好に製造することができる円筒体の製造方法を提
供することを目的とする。Another object of the present invention is to provide a method of manufacturing a cylindrical body which can easily and satisfactorily manufacture a cylindrical body having a uniform wall thickness.

【００１２】[0012]

【課題を解決するための手段】本発明の繊維材料から成
る円筒体はかかる目的を達成するために、繊維材料から
成る板材の両側縁を接合して形成される円筒体におい
て、前記板材は前記円筒体の周長方向となる幅方向に間
隔を存して設けた複数の折り目部と、該折り目部を介し
て幅方向に並列して連設された少なくとも三つの断面円
弧状の湾曲部とにより構成され、該板材を前記各折り目
部で各湾曲部の湾曲方向に折り返しつつ該板材の両側縁
を接合してなることを特徴とする。In order to achieve such an object, a cylindrical body made of a fibrous material of the present invention is a cylindrical body formed by joining both side edges of a plate made of a fibrous material. A plurality of folds provided at intervals in the width direction, which is the circumferential direction of the cylindrical body, and at least three curved portions having arcuate cross-sections, which are arranged in parallel in the width direction via the folds. The plate member is folded back in the bending direction of each bending portion at each of the folds, and both side edges of the plate member are joined together.

【００１３】本発明の繊維材料から成る円筒体によれ
ば、前記板材は三つ以上の断面円弧状の湾曲部により構
成されているので、該板材から前記円筒体を形成する際
に、それらの湾曲部の間の前記折り目部で板材を折り返
す角度は比較的小さなものとなる。それにより、該折り
目部の箇所で亀裂等の不都合が生じるのを防止すること
ができる。According to the cylindrical body made of the fibrous material of the present invention, since the plate member is composed of three or more curved portions having an arcuate cross section, when the plate member is formed into the cylindrical member, The angle at which the plate material is folded back at the folds between the curved portions is relatively small. As a result, it is possible to prevent the occurrence of inconveniences such as cracks at the folds.

【００１４】また、本発明の繊維材料からなる円筒体の
製造方法は前記の目的を達成するために、繊維材料から
成る円筒体の製造方法において、少なくとも三つの断面
円弧状の凸条湾曲成形面を幅方向に並列させて連設して
なる成形面を有する下型と該下型の各凸条湾曲成形面と
嵌合する凹条湾曲成形面を有する上型とを用い、前記下
型の成形面上に繊維材料を分散させた懸濁液を塗布する
工程と、該懸濁液により繊維材料を付着させた下型に前
記上型を嵌合させて該繊維材料を加圧する工程と、該加
圧状態で前記懸濁液の水分を除去しつつ加熱し、前記下
型の各凸条湾曲成形面の位置にその形状に対応した湾曲
部を有する繊維材料から成る板材を該下型と上型との間
に成形する工程と、成形された板材を前記湾曲部同士の
間の側縁で折り返しつつ該板材の両側縁を接合すること
により前記円筒体を得る工程とからなることを特徴とす
る。In order to achieve the above-mentioned object, the method for producing a cylindrical body made of a fiber material according to the present invention is the same as the method for producing a cylindrical body made of a fiber material, in which at least three convex-curved curved surfaces having arcuate cross sections are formed. Of the lower mold using a lower mold having a molding surface formed by arranging in parallel in the width direction and an upper mold having a concave curved molding surface that fits with each convex curved molding surface of the lower mold. A step of applying a suspension in which a fiber material is dispersed on a molding surface, and a step of fitting the upper mold to a lower mold to which the fiber material is attached by the suspension and pressurizing the fiber material, A plate material made of a fibrous material having a curved portion corresponding to the shape at the position of each convex curve forming surface of the lower mold is heated while removing water of the suspension in the pressurized state, The step of forming between the upper mold and the formed plate is folded back at the side edge between the curved parts. By joining opposite side edges of the plate material while characterized by comprising the step of obtaining the cylindrical body.

【００１５】本発明の繊維材料からなる円筒体の製造方
法によれば、前記板材の断面円弧状の湾曲部を成形する
ための前記下型の凸条湾曲成形面が三つ以上備えられて
いるので、各凸条湾曲成形面の頂部からその隣の凸条湾
曲成形面との間の側縁に至る円弧面の傾斜が比較的緩や
かなものとなるため、前記下型の成形面上に付着される
前記懸濁液中の繊維材料が各凸条湾曲成形面の頂部から
凸条湾曲成形面同士の間の箇所に流動するのが抑制され
る。これにより前記板材の肉厚を均一なものとすること
ができ、ひいては該板材から、均一な肉厚の円筒体を容
易且つ良好に製造することができる。According to the method for manufacturing a cylindrical body made of a fibrous material of the present invention, three or more ridge curved molding surfaces of the lower die for molding a curved portion having an arc-shaped cross section of the plate material are provided. Therefore, the inclination of the arc surface from the top of each convex curve forming surface to the side edge between the adjacent convex curve forming surfaces becomes relatively gentle, so that it adheres to the forming surface of the lower mold. The fibrous material in the suspension is prevented from flowing from the top of each convex curve forming surface to a portion between the convex curve forming surfaces. As a result, the thickness of the plate material can be made uniform, and thus a cylindrical body having a uniform thickness can be easily and satisfactorily manufactured from the plate material.

【００１６】そして、本発明の繊維材料からなる円筒体
の製造方法においては、前記下型の凸条湾曲成形面の個
数は三個であり、それらの凸条湾曲成形面の中央に位置
する凸条湾曲成形面は、その断面が略平坦な円弧状とな
るよう短い幅に形成されていることを特徴とする。In the method for manufacturing a cylindrical body made of the fibrous material of the present invention, the number of the convex curve forming surfaces of the lower mold is three, and the convex shape located at the center of the convex curve forming surfaces. The ridge-curving surface is characterized in that it is formed with a short width so that its cross section has a substantially flat arc shape.

【００１７】このように、前記凸条湾曲成形面の個数を
３個とした場合に、それらの凸条湾曲成形面の中央に位
置する凸条湾曲成形面をその断面が略平坦な円弧状とな
るよう短い幅に形成したときには、その中央の凸条湾曲
成形面に付着される懸濁液中の繊維材料が、両側の凸条
湾曲成形面側に流動するのが極力抑えられる。これによ
り、円筒体を形成する際の前記板材の折り返し箇所が厚
肉となるのを防止することができると共に、前記板材や
それから形成される円筒体の肉厚を全体的により均一な
ものとすることができる。また、板材の折り返し箇所が
厚肉となるのが防止されるので、その折り返しの際に亀
裂が生じるのを確実に防止することができる。As described above, when the number of the ridge-curve forming surfaces is 3, the ridge-curving surface located at the center of the ridge-curving surfaces is formed into an arc shape having a substantially flat cross section. When it is formed to have such a short width, the fibrous material in the suspension attached to the central convex curve forming surface is prevented from flowing to both convex curve forming surfaces on both sides as much as possible. This makes it possible to prevent the folded-back portion of the plate material when forming the cylindrical body from becoming thick, and also to make the plate material and the cylindrical body formed from the plate material more uniform in overall thickness. be able to. Further, since the folded-back portion of the plate material is prevented from becoming thick, it is possible to reliably prevent the occurrence of cracks at the time of folding-back.

【００１８】さらに、本発明の繊維材料からなる円筒体
の製造方法において、前記下型の各凸条湾曲成形面に
は、その円弧方向に延在する複数の凸状リブ成形部が設
けられていることを特徴とする。Further, in the method for manufacturing a cylindrical body made of the fibrous material of the present invention, a plurality of convex rib forming portions extending in the arc direction are provided on each convex curve forming surface of the lower mold. It is characterized by being

【００１９】前記下型の各凸条湾曲成形面に、その円弧
方向に延在する複数の凸状リブ成形部を設けたことで、
各凸条湾曲成形面に付着される懸濁液中の繊維材料が各
凸条湾曲成形面の軸方向で流動するのも防止することが
でき、前記板材及び円筒体の肉厚を全体的にさらに均一
なものとすることができる。By providing a plurality of convex rib forming portions extending in the arc direction on each convex curve forming surface of the lower mold,
It is also possible to prevent the fibrous material in the suspension attached to each ridge-curving surface from flowing in the axial direction of each ridge-curving surface, and to reduce the wall thickness of the plate material and the cylindrical body as a whole. It can be made more uniform.

【００２０】[0020]

【発明の実施の形態】本発明の一実施の形態を図１乃至
図６を参照して説明する。図１は本実施形態の円筒体の
斜視図、図２は図１の円筒体を作成するための板材及び
該板材を成形するための金型の斜視図、図３は図２のＩ
ＩＩ矢視図、図４乃至図６は図２の板材の成形方法を説
明するための工程説明図である。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to FIGS. 1 is a perspective view of a cylindrical body of the present embodiment, FIG. 2 is a perspective view of a plate material for forming the cylindrical body of FIG. 1 and a mold for molding the plate material, and FIG. 3 is I of FIG.
II arrow view, FIG. 4 to FIG. 6 are process explanatory views for explaining the method of forming the plate material of FIG.

【００２１】まず、図１に示す本実施形態の円筒体１を
形成するための板材を図２及び図３を参照して説明す
る。First, a plate material for forming the cylindrical body 1 of this embodiment shown in FIG. 1 will be described with reference to FIGS. 2 and 3.

【００２２】図２及び図３に示す板材２は、三つの断面
円弧状の蒲鉾形湾曲部３，４，５をその順番にそれらの
幅方向に並列させて連設した形のものであり、各湾曲部
３，４，５の円弧半径及び軸方向の長さは、いずれも作
成する円筒体１の半径及び軸方向の長さと同一とされ、
また、各湾曲部３，４，５の円弧長は、それらの総和が
作成する円筒体１の円周長に一致するようになってい
る。この場合、板材２の両側の湾曲部３，５の円弧長
は、同じ長さで比較的長いものとされ、それらの湾曲部
３，５の間に位置する湾曲部４の円弧長は、該湾曲部４
が略平坦となる程度に短いものとされている。The plate member 2 shown in FIGS. 2 and 3 has a shape in which three kamaboko-shaped curved portions 3, 4, 5 having an arcuate cross section are arranged in this order in parallel in the width direction thereof. The arc radius and the axial length of each of the curved portions 3, 4, and 5 are the same as the radius and the axial length of the cylindrical body 1 to be created.
Further, the arc lengths of the curved portions 3, 4, and 5 are arranged so that the sum of them matches the circumference length of the cylindrical body 1. In this case, the arcuate lengths of the curved portions 3 and 5 on both sides of the plate member 2 are the same length and relatively long, and the arcuate lengths of the curved portions 4 located between the curved portions 3 and 5 are Curved part 4
Is short enough to be substantially flat.

【００２３】尚、板材２は、例えば古紙とヴァージンパ
ルプとを混合したパルプ繊維（繊維材料）により後述す
るように成形されたものである。The plate material 2 is formed by a pulp fiber (fiber material), which is a mixture of waste paper and virgin pulp, as will be described later.

【００２４】湾曲部３，４の連設箇所と湾曲部４，５の
連設箇所とは、それぞれこれらの湾曲部３，４，５の長
手方向に延在する折り目部６，７となっており、該折り
目部６，７に沿って各湾曲部３，４，５をその湾曲方向
に折り返し可能としている。この場合、折り目部６，７
の位置では、図３に示すように板材２の外面側が内面側
に向かって凹溝状にへこまされており、該折り目部６，
７の位置における板材２の肉厚が他の箇所に較べて薄肉
に形成されている。The places where the curved portions 3 and 4 are connected and the places where the curved portions 4 and 5 are connected are folds 6 and 7 extending in the longitudinal direction of the curved portions 3, 4 and 5, respectively. The curved portions 3, 4, 5 can be folded back along the folds 6, 7 in the bending direction. In this case, the folds 6 and 7
3, the outer surface side of the plate member 2 is dented in the shape of a groove toward the inner surface side as shown in FIG.
The thickness of the plate member 2 at the position 7 is smaller than that at other positions.

【００２５】図２に示すように、長い円弧長を有する湾
曲部３，５の頂部には、それぞれその長手方向に延在す
るリブ８が形成され、また、湾曲部３，５の前部及び後
部には、それぞれ円弧方向に延在するリブ９，１０が形
成されている。これらのリブ８，９，１０は、湾曲部
３，５の内面側から外面側に突出するように形成されて
いる。As shown in FIG. 2, ribs 8 extending in the longitudinal direction are formed at the tops of the curved portions 3 and 5 having a long arc length, and the front portions of the curved portions 3 and 5 are formed. Ribs 9 and 10 respectively extending in the arc direction are formed at the rear portion. These ribs 8, 9 and 10 are formed so as to project from the inner surface side of the curved portions 3 and 5 to the outer surface side.

【００２６】また、板材２の両側縁部には、湾曲部３，
５の側縁にその長手方向に延在して連設する細長平板状
のフランジ１１，１１が形成されている。Further, the curved portions 3, 3 are formed on both side edges of the plate member 2.
Elongated flat plate-like flanges 11, 11 are formed on the side edge of the base plate 5 and extend in the longitudinal direction thereof to be continuous with each other.

【００２７】尚、板材２の中央の湾曲部４は、該板材２
の両側縁部のフランジ１１，１１を平面上に載置したと
き、その平面よりも上側に位置するようになっている
（図３参照）。The curved portion 4 at the center of the plate member 2 is
When the flanges 11, 11 on both side edges are placed on a plane, they are positioned above the plane (see FIG. 3).

【００２８】かかる板材２から次のように図１の円筒体
１が作成される。The cylindrical body 1 of FIG. 1 is prepared from the plate material 2 as follows.

【００２９】すなわち、図３を参照して、前記折り目部
６の位置で湾曲部４を湾曲部３に対して湾曲方向に折り
返すと共に、前記折り目部７の位置で湾曲部５を湾曲部
４に対して湾曲方向に折り返し、板材２の両側縁部のフ
ランジ１１，１１接合する。これにより、図１に示す円
筒体１が得られる。That is, referring to FIG. 3, the bending portion 4 is folded back in the bending direction with respect to the bending portion 3 at the position of the fold portion 6, and the bending portion 5 is bent to the bending portion 4 at the position of the fold portion 7. On the other hand, it is folded back in the bending direction, and the flanges 11 and 11 on both side edges of the plate material 2 are joined. As a result, the cylindrical body 1 shown in FIG. 1 is obtained.

【００３０】この場合、板材２を三つの断面円弧状の湾
曲部３，４，５により構成しておくことで、各折り目部
６，７における板材２の折り返し角度は比較的小さなも
ので済む（本実施形態では各折り目部６，７における折
り返し角度が例えば９０°程度となるように湾曲部３，
４，５の円弧長等が設定されている）。従って、板材２
から円筒体１を作成する際に、各折り目部６，７の位置
で亀裂が生じるのが防止される。In this case, since the plate member 2 is composed of three curved portions 3, 4, 5 having an arcuate cross section, the folding angle of the plate member 2 at each of the folds 6, 7 can be relatively small ( In the present embodiment, the bending portion 3, so that the folding angle at each fold portion 6, 7 is, for example, about 90 °.
4 and 5 arc length etc. are set). Therefore, the plate material 2
When producing the cylindrical body 1 from the above, it is possible to prevent cracks from being generated at the positions of the folds 6 and 7.

【００３１】また、作成された円筒体１にあっては、湾
曲部３，５の箇所に、円筒体１の軸方向に延在するリブ
８や周方向に延在するリブ９，１０が形成されるため、
該円筒体１の必要な剛性が確保される。In the produced cylinder 1, ribs 8 extending in the axial direction of the cylinder 1 and ribs 9 and 10 extending in the circumferential direction are formed at the curved portions 3 and 5. Because
The required rigidity of the cylindrical body 1 is secured.

【００３２】次に、このような円筒体１を作成するため
の板材２の成形方法を説明する。Next, a method of forming the plate member 2 for making such a cylinder 1 will be described.

【００３３】板材２は、図２に示すような下型１２及び
上型１３により構成された金型を用いて成形される。The plate member 2 is molded by using a mold composed of a lower mold 12 and an upper mold 13 as shown in FIG.

【００３４】下型１２の上面部には、前記板材２の内面
側の形状に対応した成形面１４が形成され、該成形面１
４は、板材２の湾曲部３，４，５の内面をそれぞれ成形
するための三つの断面円弧状の凸条湾曲成形面１５，１
６，１７をそれらの幅方向に連設して構成されている。A molding surface 14 corresponding to the shape of the inner surface of the plate member 2 is formed on the upper surface of the lower mold 12, and the molding surface 1
Reference numeral 4 denotes three convex arcuate curved molding surfaces 15, 1 each having an arc-shaped cross section for molding the inner surfaces of the curved portions 3, 4, 5 of the plate member 2.
6 and 17 are continuously arranged in the width direction.

【００３５】凸条湾曲成形面１５，１７の頂部には、そ
れぞれ前記板材２のリブ８を成形するための凸条リブ成
形部１８が各湾曲成形面１５，１７の長手方向に延在し
て形成され、また、凸条湾曲成形面１５，１７の前部及
び後部には、それぞれ前記板材２のリブ９，１０を成形
するための凸条リブ成形部１９，２０が円弧方向に延在
して形成されている。On the tops of the convex curve forming surfaces 15 and 17, there are formed convex rib forming parts 18 for forming the ribs 8 of the plate member 2 extending in the longitudinal direction of the curved forming surfaces 15 and 17, respectively. The rib forming portions 15, 20 for forming the ribs 9, 10 of the plate member 2 extend in the arc direction on the front and rear portions of the rib forming surfaces 15, 17, respectively. Is formed.

【００３６】尚、凸条湾曲成形面１５，１７の側方に連
なる下型１２の上面部は平面状になっており、その凸条
湾曲成形面１５，１７寄りの箇所は前記板材２のフラン
ジ１１，１１の下面部を生成するためのフランジ成形部
２１，２１となっている。The upper surface of the lower die 12 connected to the sides of the convex curve forming surfaces 15 and 17 is flat, and the portion near the convex curve forming surfaces 15 and 17 is the flange of the plate member 2. The flange forming parts 21 and 21 are for forming the lower surface parts of the parts 11 and 11.

【００３７】また、各凸条湾曲成形面１５，１６，１７
には、それに後述するように付着されるパルプ繊維を分
散させた懸濁液から水分を吸引除去するためのスリット
状の吸引孔２２が複数設けられている。Further, each convex curve forming surface 15, 16, 17
A plurality of slit-shaped suction holes 22 for sucking and removing water from a suspension in which pulp fibers are dispersed are attached to the suction holes 22.

【００３８】上型１３の下面部には、下型１２と同様
に、前記板材２の湾曲部３，４，５の外面をそれぞれ成
形するための三つの断面円弧状の凹条湾曲成形面２３，
２４，２５をそれらの幅方向に連設してなる成形面２６
が形成されている。そして、上型１３の凹条湾曲成形面
２３，２５の側方に連なる下面部には前記板材２のフラ
ンジ１１，１１と同じ幅を有するフランジ成形部２７，
２７が形成されている。Similar to the lower mold 12, the lower surface of the upper mold 13 has three recessed curved molding surfaces 23 each having an arcuate cross section for molding the outer surfaces of the curved portions 3, 4, and 5 of the plate member 2. ，
Forming surface 26 in which 24 and 25 are continuously provided in the width direction thereof
Are formed. A flange forming part 27 having the same width as the flanges 11, 11 of the plate member 2 is formed on the lower surface part of the upper die 13 which is continuous to the side of the concave curve forming surfaces 23, 25.
27 is formed.

【００３９】尚、詳細な図示は省略するが、凹条湾曲成
形面２３，２５には、下型１２と同様に、前記板材２の
リブ８，９，１０を成形するための凹条リブ成形部が形
成されている（図２では、リブ８に対応する凹条リブ成
形部の一部のみを破線で記載した）。また、各凹条湾曲
成形面２３，２４，２５には、前記下型１２の吸引孔２
２と同様の吸引孔（図示しない）が設けられている。Although not shown in detail, the concave-curve curved molding surfaces 23, 25 are molded with the concave-rib ribs for molding the ribs 8, 9, 10 of the plate member 2 as in the lower die 12. 2 is formed (in FIG. 2, only a part of the concave rib forming portion corresponding to the rib 8 is indicated by a broken line). Further, the suction holes 2 of the lower mold 12 are formed on the concave curved surface 23, 24, 25.
A suction hole (not shown) similar to that of No. 2 is provided.

【００４０】次に、前記板材２の成形工程を説明する。
尚、図４乃至図６では、便宜上、板材２のリブ８，９，
１０やこれを成形するためのリブ成形部の記載を省略し
た。図４乃至図６に概略が示された成形装置２８は、上
型１３，１３´と、下型１２，１２´とを備え、上型１
３，１３´は夫々昇降手段２９，３０により昇降され
る。一方の上型１３の下方にはパルプ繊維材料を分散さ
せた懸濁液Ｂを貯留した抄紙槽Ａが設けられている。抄
紙槽Ａの下方には、一方の下型１２を該抄紙槽Ａ内に浸
漬させる昇降手段３１が設けられている。他方の下型１
２´は上型１３，１３´の下方において移動手段３２に
より水平に往復移動される。Next, the step of forming the plate material 2 will be described.
In FIGS. 4 to 6, for convenience, the ribs 8, 9,
The description of 10 and the rib forming portion for forming the same is omitted. The molding apparatus 28 schematically shown in FIGS. 4 to 6 includes upper molds 13 and 13 ′ and lower molds 12 and 12 ′.
3, 13 'are moved up and down by lifting means 29, 30 respectively. Below one of the upper molds 13, a papermaking tank A in which a suspension B in which a pulp fiber material is dispersed is stored is provided. Below the papermaking tank A, an elevating means 31 for immersing the one lower mold 12 in the papermaking tank A is provided. The other lower mold 1
2'is horizontally reciprocated by the moving means 32 below the upper molds 13, 13 '.

【００４１】先ず、図４（ａ）に示すように、パルプ繊
維材料を分散させた懸濁液Ｂ（以下、パルプ液Ｂとい
う）を貯留した抄紙槽Ａ内に、前記下型１２を昇降手段
３１により浸漬させる。このとき、前記下型１２の吸引
孔２２を介して図示しない吸引手段によってパルプ繊維
材料の吸引が行われるので、抄紙槽Ａ内のパルプ繊維材
料は下型１２の成形面１４の表面に沿って付着する。First, as shown in FIG. 4A, the lower mold 12 is moved up and down in a papermaking tank A in which a suspension B in which a pulp fiber material is dispersed (hereinafter referred to as pulp liquid B) is stored. Immerse with 31. At this time, since the pulp fiber material is sucked by the suction means (not shown) through the suction hole 22 of the lower mold 12, the pulp fiber material in the papermaking tank A is along the surface of the molding surface 14 of the lower mold 12. Adhere to.

【００４２】次いで、図４（ｂ）に示すように昇降手段
３１により下型１２を抄紙槽Ａ内から押し上げると共
に、上型１３を昇降手段２９により下降させ、更に下型
１２と上型１３との成形面１４，２６を互いに嵌合させ
て型締めする。この時、パルプ繊維材料は下型１２及び
上型１３の間に形成されるキャビティ内で加圧され、同
時に、下型１２の吸引孔２２及び上型１８の図示しない
吸引孔からは成形面１４，２６間のキャビティ内のパル
プ液Ｂの水分が図示しない吸引手段によって吸引されて
除去される。Next, as shown in FIG. 4 (b), the lower die 12 is pushed up from inside the paper making tank A by the elevating means 31, and the upper die 13 is lowered by the elevating means 29, and the lower die 12 and the upper die 13 are separated. The molding surfaces 14 and 26 are fitted to each other and clamped. At this time, the pulp fiber material is pressurized in the cavity formed between the lower mold 12 and the upper mold 13, and at the same time, the molding surface 14 is discharged from the suction holes 22 of the lower mold 12 and the suction holes (not shown) of the upper mold 18. , 26, the moisture of the pulp liquid B in the cavity is sucked and removed by a suction means (not shown).

【００４３】これにより、成形面１４，２６間のキャビ
ティ内にパルプ繊維からなる予備成形物２´（図５
（ａ）参照）が成形される。この予備成形物２´は、最
終的に得る板材２とほぼ同じ形状のものである。As a result, the preform 2'comprising pulp fibers is formed in the cavity between the molding surfaces 14 and 26 (see FIG. 5).
(See (a)) is molded. The preform 2'has substantially the same shape as the plate material 2 to be finally obtained.

【００４４】そして、図５（ａ）に示すように、予備成
形物２´を上型１３の成形面２６に吸引保持した状態で
上型１３を上昇させ、下型１２を前記抄紙槽Ａのパルプ
液Ｂ内に浸漬させると同時に、他方の下型１２´を移動
手段３２により上型１３の下方に進出させる。Then, as shown in FIG. 5 (a), the upper mold 13 is raised while the preform 2'is suction-held on the molding surface 26 of the upper mold 13, and the lower mold 12 is moved to the papermaking tank A. At the same time as the lower mold 12 ′ is dipped in the pulp liquid B, the other lower mold 12 ′ is advanced below the upper mold 13 by the moving means 32.

【００４５】次いで、図５（ｂ）に示すように、上型１
３を昇降手段２９により下降させ、他方の下型１２´と
上型１３との成形面１４´，２６を互いに嵌合させて第
２の型締めを行う。この時、予備成形物２´は図示しな
いヒータにより加熱されつつ両成形面１４´，２６に加
圧される。Then, as shown in FIG. 5B, the upper mold 1
3 is lowered by the elevating means 29, the molding surfaces 14 'and 26 of the other lower mold 12' and upper mold 13 are fitted to each other, and the second mold clamping is performed. At this time, the preform 2'is pressed against both molding surfaces 14 'and 26 while being heated by a heater (not shown).

【００４６】続いて、上型１３の上昇時に予備成形物２
´をその成形面２６から型抜きして、下型１２´上に載
置状態とする。そして図６に示すように、下型１２´を
他方の上型１３´の下方に移動させ、該上型１３´を昇
降手段３０により下降させ、図示しないヒータにより加
熱しつつ上型１３´及び下型１２´の成形面２６´，１
４´間で加圧する。このとき、両成形面２６´，１４´
間の間隔を前記成形面２６，１４間の間隔より狭く設定
しておくことで、より強い加圧状態とする。これによ
り、パルプ繊維材料の組織構成が強固とされた板材２が
成形される。Subsequently, when the upper mold 13 is raised, the preform 2
The mold ′ is die-cut from the molding surface 26 and placed on the lower mold 12 ′. Then, as shown in FIG. 6, the lower die 12 'is moved to the lower side of the other upper die 13', the upper die 13 'is lowered by the elevating means 30, and the upper die 13' and the upper die 13 'are heated by a heater (not shown). Molding surface 26 ', 1 of the lower mold 12'
Pressurize between 4 '. At this time, both molding surfaces 26 ', 14'
By setting the interval between the molding surfaces 26, 14 to be narrower than the interval between the molding surfaces 26, 14, a stronger pressure is applied. As a result, the plate material 2 in which the structural constitution of the pulp fiber material is strengthened is molded.

【００４７】そして、このように成形された板材２か
ら、前述したように前記円筒体１が作成される。Then, the cylindrical body 1 is prepared from the plate material 2 thus formed, as described above.

【００４８】かかる板材２の成形において、下型１２と
上型１３とを型締めしてパルプ液Ａを加圧する際（図４
（ｂ）の工程）には、下型１２の凸条湾曲成形面１５，
１７の頂部の箇所のパルプ液Ａ中のパルプ繊維が多少、
フランジ成形部２１，２１側に凸条湾曲成形面１５，１
７の円弧面に沿って水分と共に流動するものの、凸条湾
曲成形面１５，１７の頂部からそれらの間の凸条湾曲成
形面１６側に至る円弧面はその傾斜が緩やかなものとな
っているため、凸条湾曲成形面１６側へのパルプ繊維の
流動は十分に少ないものに抑えられる。従って、凸条湾
曲成形面１５，１７の頂部の箇所におけるパルプ繊維が
多量に流出してしまうことはなく、十分な量のパルプ繊
維が残存する。In molding the plate member 2, when the lower mold 12 and the upper mold 13 are clamped to pressurize the pulp liquid A (see FIG. 4).
In the step (b)), the convex curved surface 15 of the lower mold 12 is formed,
Some pulp fibers in the pulp liquid A at the top of 17
On the flange forming parts 21 and 21 side, the convex curved surface 15 and 1 is formed.
Although it flows along with the water along the arcuate surface of No. 7, the arcuate surface extending from the tops of the convex curve forming surfaces 15 and 17 to the side of the convex curve forming surface 16 between them has a gentle inclination. Therefore, the flow of the pulp fiber toward the convex curved surface 16 can be suppressed to a sufficiently small amount. Therefore, a large amount of pulp fibers do not flow out at the top portions of the convex-curved curved surfaces 15 and 17, and a sufficient amount of pulp fibers remain.

【００４９】また、凸条湾曲成形面１５，１７の間の凸
条湾曲成形面１６の箇所においては、該凸条湾曲成形面
１６が略平坦であるので、パルプ液Ａ中のパルプ繊維が
凸条凸条湾曲成形面１５，１７側にほとんど流動するこ
となく残存する。At the location of the ridge-curved molding surface 16 between the ridge-curved molding surfaces 15 and 17, since the ridge-curved molding surface 16 is substantially flat, the pulp fibers in the pulp liquid A are convex. The ridges and ridges remain on the molding surfaces 15, 17 with almost no flow.

【００５０】そして、前記板材２の折り目部６，７（図
２参照）に相当する凸条湾曲成形面１５，１７と凸条湾
曲成形面１６との境界部分にあっては、凸条湾曲成形面
１６側からパルプ繊維が流動してくることはほとんどな
いと共に、凸条湾曲成形面１５，１７側から流動してく
るパルプ繊維は僅かなものであるため、必要以上に多く
のパルプ繊維が溜まることがない。At the boundary between the ridge-curved molding surfaces 15 and 17 corresponding to the creases 6 and 7 (see FIG. 2) of the plate member 2 and the ridge-curved molding surface 16, the ridge-curved molding is performed. Pulp fibers rarely flow from the surface 16 side, and since only a few pulp fibers flow from the convex curve forming surfaces 15 and 17, more pulp fibers accumulate than necessary. Never.

【００５１】さらに、凸条湾曲成形面１５，１７にあっ
ては、前記図２に示したように、その前部及び後部に円
弧方向に延在する凸条リブ成形部１９，２０が設けられ
ているため、それらの凸条リブ成形部１９，２０が障壁
となって、パルプ液Ａ中のパルプ繊維が両成形面１４，
２６間によるキャビティの前端部や後端部に流動するの
も防止される。Further, as shown in FIG. 2, the ridge-curved molding surfaces 15 and 17 are provided with ridge rib molding portions 19 and 20 extending in the arc direction at the front and rear portions thereof. Therefore, the convex rib forming portions 19 and 20 serve as barriers, and the pulp fibers in the pulp liquid A are formed on both forming surfaces 14 and
It is also prevented from flowing to the front end portion and the rear end portion of the cavity due to the gap between the 26.

【００５２】これにより、前述したように成形される板
材２は、その肉厚が均一的なものとなって、該板材２か
ら作成される前記円筒体１の肉厚も均一的なものとな
る。As a result, the plate member 2 formed as described above has a uniform wall thickness, and the cylindrical body 1 made from the plate member 2 also has a uniform wall thickness. .

【００５３】尚、以上説明した実施形態においては、三
つの湾曲部３，４，５を設けた板材２から作成する円筒
体１及びその製造方法を説明したが、さらに多くの湾曲
部を有する板材を本実施形態と同様に金型により成形
し、その板材から円筒体を作成するうようにすることも
可能であることはもちろんである。In the embodiment described above, the cylindrical body 1 made from the plate member 2 provided with the three curved portions 3, 4 and 5 and the manufacturing method thereof have been described, but the plate member having more curved portions is described. Needless to say, it is also possible to form a cylindrical body from the plate material by molding with a mold as in the present embodiment.

【００５４】また、本実施形態においては、円筒体の繊
維材料としてパルプ繊維を用いたものを説明したが、動
物性繊維等の天然繊維や、合繊繊維等の他の繊維材料を
用いることも可能である。In the present embodiment, the pulp fiber is used as the fiber material of the cylindrical body. However, natural fiber such as animal fiber or other fiber material such as synthetic fiber can be used. Is.

【図面の簡単な説明】[Brief description of drawings]

【図１】本実施形態の繊維材料からなる円筒体の一例の
斜視図。FIG. 1 is a perspective view of an example of a cylindrical body made of a fiber material according to an embodiment.

【図２】図１の円筒体を作成するための板材及びその板
材を成形するための金型の斜視図。FIG. 2 is a perspective view of a plate material for forming the cylindrical body of FIG. 1 and a mold for molding the plate material.

【図３】図２のＩＩＩ矢視図。FIG. 3 is a view on arrow III in FIG.

【図４】図２の板材の成形方法を説明するための工程説
明図。4A to 4C are process explanatory views for explaining a method of forming the plate material of FIG.

【図５】図４に続く工程説明図。FIG. 5 is a process explanatory diagram that follows FIG. 4;

【図６】図５に続く工程説明図。FIG. 6 is an explanatory view of the process following FIG.

【図７】従来の円筒体の製造方法を説明するための説明
図。FIG. 7 is an explanatory view for explaining a conventional method for manufacturing a cylindrical body.

【符号の説明】[Explanation of symbols]

１…円筒体、２…板材、３，４，５…湾曲部、６，７…
折り目部、１２…下型、１３…上型、１５，１６，１７
…凸条湾曲成形面、２３，２４，２５…凹条湾曲成形
面、１９，２０…凸条リブ成形部、Ａ…パルプ繊維を分
散させた懸濁液。1 ... Cylindrical body, 2 ... Plate material, 3, 4, 5 ... Curved part, 6, 7 ...
Fold lines, 12 ... Lower mold, 13 ... Upper mold, 15, 16, 17
... ridge-curved molding surface, 23, 24, 25 ... concave-curved molding surface, 19, 20 ... ridge rib-molded portion, A ... suspension in which pulp fibers are dispersed.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 犬養 洋介 埼玉県岩槻市鹿室605−１ 株式会社トー モク社宅Ｂ102 (72)発明者 鎌塚 真樹 埼玉県大宮市日進町１丁目706−13 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yosuke Inuyo 605-1 Shimuro, Iwatsuki City, Saitama Prefecture Tomok Co., Ltd. B102 (72) Inventor Masaki Kamazuka 1-chome, Nisshin-cho, Omiya City, Saitama 706-13

Claims (4)

【特許請求の範囲】[Claims] 【請求項１】繊維材料から成る板材の両側縁を接合して
形成される円筒体において、前記板材は前記円筒体の周
長方向となる幅方向に間隔を存して設けた複数の折り目
部と、該折り目部を介して幅方向に並列して連設された
少なくとも三つの断面円弧状の湾曲部とにより構成さ
れ、該板材を前記各折り目部で各湾曲部の湾曲方向に折
り返しつつ該板材の両側縁を接合してなることを特徴と
する繊維材料から成る円筒体。1. A cylindrical body formed by joining both side edges of a plate material made of a fibrous material, wherein the plate material is provided with a plurality of folds provided at intervals in a width direction which is a circumferential direction of the cylindrical body. And at least three curved portions having an arcuate cross section that are continuously arranged in parallel in the width direction through the fold portions, and the plate member is folded back in the bending direction of each curved portion at each of the fold portions. A cylindrical body made of a fiber material, which is formed by joining both side edges of a plate material. 【請求項２】繊維材料から成る円筒体の製造方法におい
て、少なくとも三つの断面円弧状の凸条湾曲成形面を幅
方向に並列させて連設してなる成形面を有する下型と該
下型の各凸条湾曲成形面と嵌合する凹条湾曲成形面を有
する上型とを用い、前記下型の成形面上に繊維材料を分
散させた懸濁液を塗布する工程と、該懸濁液により繊維
材料を付着させた下型に前記上型を嵌合させて該繊維材
料を加圧する工程と、該加圧状態で前記懸濁液の水分を
除去しつつ加熱し、前記下型の各凸型湾曲成形面の位置
にその形状に対応した湾曲部を有する繊維材料からなる
板材を該下型と上型との間に成形する工程と、成形され
た板材を前記湾曲部同士の間の側縁で折り返しつつ該板
材の両側縁を接合することにより前記円筒体を得る工程
とからなることを特徴とする繊維材料から成る円筒体の
製造方法。2. A method for manufacturing a cylindrical body made of a fibrous material, wherein a lower mold having a molding surface formed by arranging at least three convex curved molding surfaces having an arcuate cross section in parallel in the width direction and the lower mold. And a step of applying a suspension in which a fiber material is dispersed onto the molding surface of the lower mold, using an upper mold having a concave curved molding surface that fits with each convex curve molding surface of A step of fitting the upper mold to a lower mold to which a fiber material is attached by a liquid and pressurizing the fiber material; and heating while removing the water content of the suspension in the pressurized state, A step of molding a plate material made of a fibrous material having a curved portion corresponding to the shape at the position of each convex curved molding surface between the lower mold and the upper mold; and a molded plate material between the curved portions. The step of obtaining the cylindrical body by joining both side edges of the plate material while folding back the side edges of Method for manufacturing a cylindrical body made of a fiber material and symptoms. 【請求項３】前記下型の凸条湾曲成形面の個数は三個で
あり、それらの凸条湾曲成形面の中央に位置する凸条湾
曲成形面は、その断面が略平坦な円弧状となるよう短い
幅に形成されていることを特徴とする請求項２記載の繊
維材料から成る円筒体の製造方法。3. The number of convex ridge curve forming surfaces of the lower die is three, and the convex ridge curve forming surfaces located at the center of the convex ridge curve forming surfaces are arc-shaped with a substantially flat cross section. The method for producing a cylindrical body made of a fiber material according to claim 2, wherein the cylindrical body is formed to have a short width. 【請求項４】前記下型の各凸条湾曲成形面には、その円
弧方向に延在する複数の凸状リブ成形部が設けられてい
ることを特徴とする請求項２又は３記載の繊維材料から
成る円筒体の製造方法。4. The fiber according to claim 2, wherein a plurality of convex rib forming portions extending in the arc direction are provided on each convex curve forming surface of the lower mold. A method of manufacturing a cylindrical body made of a material.