Patent ID: 8381948

Claim:
An automatic liquid stop bag with a bending portion, comprising: two outer films; two inner films, vertically overlapped with each other and formed between the two outer films, and having a stop plate pre-installed between the two inner films or a heat resisting material pre-coated between the two inner films; a storage area, coupled to the two outer films, and formed between the two outer films, for storing a liquid; a discharge channel, coupled to the two inner films and formed between the two inner films, and including at least one inlet, a bent portion and an outlet, and the two inner films being coupled to each outer film by heat sealing, and the bent portion being coupled to the inlet and the outlet; and a tear portion, disposed at the outlet of the discharge channel, and exposed from the outlet of a discharge channel after the tear portion is torn open; characterized in that the level of the liquid is forced to rise, when the storage area is squeezed by an external force, so that the two outer films are pulled outward by the liquid to open the inlet of the discharge channel automatically, and the liquid flows along the bent portion of the discharge channel towards the outlet, and after the external force is released, a reaction sucking force refluxes the liquid to the storage area, such that the two inner films at the bent portion of the discharge channel are attached with each other by the reaction force to seal the discharge channel, and when the external pressure is released, the liquid returns from the bent portion to the storage area to produce the reaction force instantaneously to achieve an effect of sealing the discharge channel, and the two inner films at the bent portion are attached to each other to achieve an effect of enhancing the sealing effect.