PROBLEM TO BE SOLVED: To provide a manufacturing method of a knotless net that eliminates the need for handiwork in a heat setting machine, can be shipped in a closed state of mesh without widening in the shipping, and also can be widened even in square mesh or in diamond mesh when in use.SOLUTION: A manufacturing method of this knotless net comprises the following steps: a step of preparing for the first multifilament yarn comprising composite filaments where a sheath is a low melting point polymer component and a core is a high melting point polymer component a step of preparing for the second multifilament yarn comprising filaments of a polymer component having a melting point higher than that of a low melting point polymer component a step of obtaining the composite yarn by winding the coated yarn on the surface of the core yarn using the first multifilament yarn as the core yarn and using the second multifilament yarn as the coated yarn a step of obtaining the knotless net by applying the composite yarn to a knotless net making machine as the net yarn and a step of introducing the knotless net into a heat setting machine without widening the knotless net and melting only the low melting point polymer component, and then cooling and solidifying the low melting point polymer component.SELECTED DRAWING: None【課題】 熱処理機内でなんらの細工も必要なく、出荷時にも拡幅せずに目が閉じた状態で出荷することができ、使用時において角目にも菱目にも拡幅しうる無結節網の製造方法を提供する。【解決手段】 この無結節網の製造方法は、以下の工程よりなる。鞘部が低融点重合体成分で、芯部が高融点重合体成分の複合フィラメントよりなる第一マルチフィラメント糸を準備する工程、低融点重合体成分よりも融点の高い重合体成分のフィラメントよりなる第二マルチフィラメント糸を準備する工程、第一マルチフィラメント糸を芯糸とし、第二マルチフィラメント糸を被覆糸として、芯糸の表面に被覆糸を巻き付けて複合糸を得る工程、複合糸を網糸として無結節網機に掛けて、無結節網を得る工程、及び、無結節網を拡幅させることなく、熱処理機に導入し低融点重合体成分のみを溶融させた後、冷却して低融点重合体成分を固化させる工程よりなる。【選択図】 なし
