縦糸を開口

EP2883986(JP)
[0049] As for the selvage-tightening yarns, it is preferable to thread one selvage-tightening yarn through one of the healds that open the warp yarns.
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  耳締め糸は、経糸を開口させるヘルド１本に、耳締め糸を１本通すのが好ましい。

For example, in the case where the warp fineness (ground yarn total fineness) is 470 dtex, the total fineness of the selvage-tightening yarns is 660 dtex, and the number of selvage-tightening yarns is four,
例えば、経糸繊度（地部糸総繊度）４７０ｄｔｅｘで、耳締め糸の総繊度６６０ｄｔｅｘ、本数が４本では、

it is preferable that one selvage-tightening yarn be passed through one of the healds that open the warp yarns,
経糸を開口させるヘルド１本に、耳締め糸を１本引き通し、

and every two of the yarns having fineness of 660 dtex be passed through one reed split.
筬羽１羽に繊度６６０ｄｔｅｘを２本ずつ引き通すことが好ましい。