The present invention is an improved fermentation bag comprising a bag body, a one-way air valve and a diaphragm, the inside of the bag body forming an accommodation space, and the bag body is formed with a perforated exhaust portion, the one-way gas The valve is disposed in the exhaust portion of the bag body and is located in the accommodating space. The one-way air valve includes a valve body and a valve piece, and the valve body forms an exhaust port communicating with the perforation on the opposite sides of the valve chamber and the connection space. The air port, the valve piece is disposed in the valve chamber of the valve body, and the one-way air valve can be opened unidirectionally from the air inlet to the exhaust port, and the diaphragm is disposed on the outer side of the exhaust portion of the bag body and formed to be respectively connected Through-hole perforation, the improved fermentation bag mainly improves the structural strength of the exhaust portion of the bag body by the diaphragm, so that the exhaust portion of the bag body is not easily broken by pulling, thereby enhancing the internal fermentation of soy protein or mashed feed. Product production yield.本創作係一種改良式醱酵袋，其包含一袋體、一單向氣閥及一膜片，袋體內部形成容置空間，且袋體上形成有一具有穿孔之排氣部，單向氣閥設於袋體的排氣部並位於容置空間內，單向氣閥包含閥體及閥片，閥體於閥室之相對二側形成連通穿孔的排氣口及連通容置空間的進氣口，閥片設於閥體之閥室內，並使單向氣閥能自進氣口朝排氣口方向單向開啟，膜片設於袋體的排氣部外側面並形成有分別連通穿孔之通孔，改良式醱酵袋主要藉由膜片提高袋體之排氣部的結構強度，使袋體之排氣部不易因拉扯而破損，進而提升內部醱酵大豆蛋白或醱酵飼料產品之生產良率。
