초록 ▼

A papermaking machine uses a low pressure water jet mounted on a pneumatic actuator for movement at least as fast in the cross machine direction as the paper web moves in the machine direction for a distance of 2 to 12 inches. The jet rapidly cuts a tail with a blunt edge of 2 to 12 inches wide from

A papermaking machine uses a low pressure water jet mounted on a pneumatic actuator for movement at least as fast in the cross machine direction as the paper web moves in the machine direction for a distance of 2 to 12 inches. The jet rapidly cuts a tail with a blunt edge of 2 to 12 inches wide from the web. The actuator is mounted on a screw or belt driven carriage to traverse the web and expand the tail after it has been threaded through the dryer section until the tail encompass the entire web and thus completes the threading process. A controller coordinates an air jet positioned beneath a doctor blade and a vacuum suction roll which engages the last press roll. The air jet and vacuum suction roll are actuated when the blunt end of the tail engages the doctor blade. In this way a tail with little or no streamer is formed and blown onto a dryer fabric supported on a vacuum suction roll which leads the tail into a single tier dryer section.

대표청구항 ▼

[ I claim:] [1.] A papermaking machine comprising;at least one forming fabric on which a paper web is formed;a pressing section having at least one press and being without open draws, in web receiving relationship with the forming fabric so the paper web is transferred between the forming fabric and

[ I claim:] [1.] A papermaking machine comprising;at least one forming fabric on which a paper web is formed;a pressing section having at least one press and being without open draws, in web receiving relationship with the forming fabric so the paper web is transferred between the forming fabric and the pressing section without an open draw;a carriage mounted to move in a cross machine direction across the paper web, before the web reaches the at least one press of the pressing section;a low pressure water jet positioned on the carriage and directed towards the web, wherein the water jet is movable rapidly in the cross machine direction with respect to the web to cut from the web a tail with a blunt tail end;a dryer section without open draws having a vacuum suction roll positioned to receive the web from the pressing section; anda controller which controls the vacuum suction roll to actuate the vacuum suction roll in response to the cutting of the tail, to transfer the tail of the paper web from the pressing section to the dryer section when the blunt tail end first reaches the vacuum suction roll.