Patent ID: 7448803
Filing Date: 2008-11-11
Classification: B31B,B65D

Abstract:
1. A production method for compression bag comprising: a plurality of longitudinal continuous components of flexible resin sheets, the sheets being continuously supplied in a longitudinal direction to lie one upon another and then bonded at predetermined positions so as to form an article containing portion having a space for an article and an air passageway having a space continuing to the space of the article containing portion, wherein said components comprise a frontal sheet; a rear sheet which is equal to the frontal sheet in breadth dimension being a transverse side dimension of the sheets; at least one valve body sheet disposed between said frontal and rear sheets and made smaller than said frontal and rear sheets in breadth dimension; and a base member disposed in a manner to be layered between at least one of the frontal sheet and the rear sheet to which the valve body sheet is bonded, and the valve body sheet bonded to said sheet, and is made smaller than the valve body sheet in breadth dimension, and the process comprising: a step of placing the valve body sheet and the base member laid thereon between the frontal sheet and the rear sheet; a step of bonding said disposed components at predetermined positions, wherein side seals acting as a sidewall of the air passageway are formed in the step of bonding said components in respect of forming the air passageway.