Reverse extrusion

Japanese: 逆押出し - ぎゃくおしだし
Reverse extrusion

...Products made by extrusion include aluminum sash materials for window frames, bars, shapes, and tubes made of aluminum, copper, and their alloys, as well as stainless steel and special steel tubes. When pushing out materials from a container, there are two methods: forward extrusion (positive extrusion), in which the entire material is pushed from the back of the material toward the outlet like tokoroten, and backward extrusion (reverse extrusion), in which a die like a perforated plug is pushed into the material. The terms forward and positive mean that the direction of the force applied is the same as the direction the product flows out, while backward and reverse mean that they are opposite to each other.

*Some of the terminology that refers to "reverse extrusion" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…押出加工による製品には,窓枠用などのアルミサッシュ材,アルミニウムや銅およびそれらの合金などの棒材,形材,管材などのほか,ステンレス鋼や特殊鋼の管材などがある。 コンテナーに入っている材料を押し出す場合には,ところてんのように材料の後ろから出口のほうへ材料全体を押す前方押出し(正押出し)の方法と,孔のあいた栓のようなダイスを材料の中へ押し込む後方押出し(逆押出し)との二つの方法がある。前方とか正とかいう呼称は力を加える方向と製品が流出する方向とが一致していることを意味しており,後方や逆という呼称はそれらが互いに反対であることを意味している。…

※「逆押出し」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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