| 摘要 |
PROBLEM TO BE SOLVED: To avoid or suppress pressure loss caused by an air-impermeable part while applying techniqueies for sucked air control by the simple-structured air-impermeable part which can be easily attached/detached. SOLUTION: An air flow control guide 6, which receives sucked air 3 sucked from an intake 1 into a bag by increasing the air-impermeability or resistance against permeability of a sucked side bag wall 2, is disposed on the sucked side bag wall 2 facing the intake 1. The air flow control guide 6 has a guide surface having a projection facing the intake 1 side at least at the center. The guide surface generates an inverted air flow toward an intake side bag wall 5 along a side peripheral bag wall 4 after dividing the received sucked air 3 in at least two specific directions such as upper and lower directions or in the whole circumference according to the shape of the projection from the center toward the side peripheral bag wall 4. COPYRIGHT: (C)2011,JPO&INPIT
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