Valved sack with inner hose valve - has sealing material in excess quantity in valve mouth

摘要

The valved sack has a hose-shaped internal or external valve. On the inside of the valve opening is a mass of sealing material adhering under the effect of heat. The material, which is preferably of the kind melting when heated, is applied in excessive quantity. It can be in the form of two or more rings of glue (4), spaced apart, and with a thickness between 0.2 and 0.7 mm. The design is particularly for handling dusty material, very little effort being needed to seal the sack.