Patent ES-8506503-A1 (ES)
Title: Stacking thermoplastic sheets flat free of folds
IPC: B29D99/00
Filed: 1984-10-05
Abstract: Apparatus for processing thermoplastic web intermittently unwound from a web roll and provided with means for making equally spaced pairs of holes adjacent one edge of the web and means for severing equal increments of the web along a line transverse to the direction of web advance to produce web segments of equal dimensions and each of which contain a pair of holes is described. Appts.  further includes means for supporting the leading advanced web increment before and following severance, means for transferring and stacking the segment on pins projecting through the pair of holes. - Improvement is means operable during advance of the web for directing high velocity air streams in the direction of web advance and between the path of the web and the supporting means, and means for directing high velocity air streams derived from nozzles located below and adjacent the end of the web segment parallel to the direction of web advance, the air streams having the combined effect to remove waviness or wrinkles from the web segment while it is deployed on the supporting means.  (0/6) EPAB- EP-141287 B Apparatus for processing thermoplastic web intermittently unwound from a web roll and provided with means for making equally spaced pairs of holes adjacent one edge of the web and means for severing equal increments of the web along a line transverse to the direction of web advance to produce web segments of equal dimensions and each of which contain a pair of holes is described. Appts.  further includes means for supporting the leading advanced web increment before and following severance, means for transferring and stacking the segment on pins projecting through the pair of holes. - Improvement is means operable during advance of the web for directing high velocity air streams in the direction of web advance and between the path of the web and the supporting means, and means for directing high velocity air streams derived from nozzles located below and adjacent the end of the web segment parallel to the direction of web advance, the air streams having the combined effect to remove waviness or wrinkles from the web segment while it is deployed on the supporting means.  (16pp Dwg.No.0/6) - EP-141287 B Apparatus for processing a thermoplastic web intermittently unwound from a web roll and provided with means for making equally spaced pairs of holes adjacent to one edge of the web and means for sealing and severing equal increments of the web along a line transverse to the direction of web advance to thereby produce web  segments of equal dimensions, each of said segments containing a pair of said holes, said apparatus further including means for supportinq the leadinq advanced web increment before and following severance, means operable during advance of the web for directing high velocity air streams in the direction of web advance and between the path of the web and said supporting means, and means for directing high velocity air streams derived from nozzles located below and adjacent the ends of the web segment parallel to the direction of web advance, and means for transferring and stacking the segments on pins such that the pins project through the pair of holes, said transferring means including a plurality of radially extending circumferentially spaced transverse pairs of hollow arms provided with holes communicating with a source if vacuum, means for rotating said arms in synchronism with the intermittent advance of the web with said arms describing a path straddling the supporting means to grasp successive web segments and transport the segment held thereby in a circular arc onto the pins, characterized in that a stationary air baffel is provided adjacent the supporting means for deflecting the air currents created by the air-streams away from the path in which the segments are transferred and placed on the pins. (8pp) GBAB- GB2147572 B Apparatus for processing thermoplastic web intermittently unwound from a web roll and provided with means for making equally spaced pairs of holes adjacent one longitudinal side edge of the web, means for sealing and severing equal increments of the web along a line transverse to the direction of web advance thereby to produce web segments of equal dimensions and each of which contain a pair of holes, means for supporting the leading advanced web increment before and following severance and means for transferring and stacking the segment on pins projecting through the pair of holes; wherein there are provided means operable only during advance of the web for directing first air streams in the direction of web advance and between the path of the web and said supporting means, together with further means for directing second air streams having a component transverse to the direction of the web advance and at the longitudinal side edges of the web segment, said further means being nozzles located below and adjacent each of said longitudinal side edges of the web segment; so that said first and second air streams have the combined effect of removing waviness or wrinkles from the web segment whilst it is deployed on the supporting means.r - GB2147572 B Apparatus for processing thermoplastic web intermittently unwound from a web roll and provided with means for making equally spaced pairs of holes adjacent one longitudinal side edge of the web, means for sealing and severing equal increments of the web along a line transverse to the direction of web advance thereby to produce web segments of equal dimensions and each of which contain a pair of holes, means for supporting the leading advanced web increment before and following severance and means for transferring and stacking the segment on pins projecting through the pair of holes; wherein there are provided means operable only during advance of the web for directing first air streams in the direction of web advance and between the path of the web and said supporting means, together with further means for directing second air streams having a component transverse to the direction of the web advance and at the longitudinal side edges of the web segment, said further means being nozzles located below and adjacent each of said longitudinal side edges of the web segment; so that said first and second air streams have the combined effect of removing waviness or wrinkles from the web segment whilst it is deployed on the supporting means. USAB- US4573955 A Appts. for processing thermoplastic web intermittently unwound from a web roll, with equally spaced pairs of holes adjacent one edge of the web, the web being sealed and severed along a line transverse to the direction of web advance, and being transferred and stacked on pins which extend through the pair of holes, comprises nozzles for directing high velocity air streams in the direction of web advance and parallel to web advance to remove wrinkles from web segments deployed on a supporting structure. The transfer and stacking assembly comprises a pair of transverse arms, each of which includes a number of radially extending spaced hollow arms provided with holes in communication with a vacuum pump. The arms rotate in synchronism with the intermittent web advance.