초록 ▼

A method and apparatus in a paper making machine for transferring a web from a pick-up fabric to a flow-through drying wire for transport of the wire supported web to a flow-through dryer cylinder including passing a section of the flow-through drying wire over the web supported by the pick-up fabri

A method and apparatus in a paper making machine for transferring a web from a pick-up fabric to a flow-through drying wire for transport of the wire supported web to a flow-through dryer cylinder including passing a section of the flow-through drying wire over the web supported by the pick-up fabric thereby defining a sandwich structure of the drying wire, the web and the pick-up fabric. A first vacuum is applied by a first vacuum member on the sandwich structure from the flow-through drying wire side over a narrow first detaching zone. The direction of the pick-up fabric with respect to the flow-through drying wire is deviated and a second vacuum is applied by a second vacuum member over a second detaching zone subsequent to the first detaching zone in the direction of web travel from the drying wire side thereof thereby securing the web on the flow-through drying wire. The pick-up fabric may thus comprise either a felt or wire structure.

대표청구항 ▼

A method in a paper making machine for transferring a web from a pick-up fabric to a flow-through drying wire and for transporting the web supported by said drying wire over a flow-through dryer cylinder,said drying wire engaging said drying cylinder, comprising the steps of: passing a section of sa

A method in a paper making machine for transferring a web from a pick-up fabric to a flow-through drying wire and for transporting the web supported by said drying wire over a flow-through dryer cylinder,said drying wire engaging said drying cylinder, comprising the steps of: passing a section of said flow-through drying wire over the web supported by the pick-up fabric defining a sandwich structure of the drying wire, the web and the pick-up fabric; applying a first vacuum from a first vacuum member on said sandwich structure from the flow-through drying wire side thereof over a narrow first detaching zone; deviating the direction of the pick-up fabric with respect to the flow-through wire; applying a second vacuum from a second vacuum member over a second holding zone substantially immediately subsequent to said first detaching zone in the direction of web travel from the flow through drying wire side thereof,said first and second vacuums being supplied from the same source, and further including the step of providing means for fluidly communicating said first and second vacuum members and adjusting the relative magnitudes of the first and second vacuums by adjusting said fluid communication means. Apparatus in a paper making machine for transferring a web from a pick-up fabric to a flow-through drying wire comprising: a pick-up fabric for transporting a web; a lead-in roller engaging said pick-up fabric; a flow-through drying cylinder; a flow-through drying wire having a draw defined between a section adapted to overlap the web supporting pick-up fabric on said lead-in roller and a section engaged on the flow-through drying cylinder; means located adjacent said draw of said flow-through drying wire in the proximity of said lead-in roller for applying a first vacuum over a narrow first detaching zone of said flow-through wire draw; and means located subsequent to said first vacuum applying means in the direction of web travel adjacent to said draw of said flow-through drying wire for applying a second vacuum over a second holding zone of said flow-through wire draw,said second vacuum applying means comprising a vacuum chamber having an air pervious guide surface located contiguous with said flow-through drying wire draw, said air pervious guide surface including a perforated stationary plate member.