Abstract: A system and method for making bags in a continuous in-line process includes a central processing unit and a camera oriented to take an image of a bag based on a triggering signal. The camera provides an image to the central processing unit. The central processing unit is programmed to process the image and calculate a timing signal based on the image. A cylindrical rotatable drum having at least one seal bar provides a triggering signal to the central processing unit, to trigger when the camera should take the image. A perforation knife is controlled by a servo drive. The perforation knife is downstream of the drum. The servo drive receives the timing signal for activating the perforation knife from the central processing unit. The CPU uses the image and based on the distance between the seal region and the perforated line, counts pixels to result in an actual pixel count. The CPU then calculates a pixel count error by subtracting the actual pixel count from a predetermined pixel count setpoint.

Abstract: A system and method for making bags in a continuous in-line process includes a central processing unit and a camera oriented to take an image of a bag based on a triggering signal. The camera provides an image to the central processing unit. The central processing unit is programmed to process the image and calculate a timing signal based on the image. A cylindrical rotatable drum having at least one seal bar provides a triggering signal to the central processing unit, to trigger when the camera should take the image. A perforation knife is controlled by a servo drive. The perforation knife is downstream of the drum. The servo drive receives the timing signal for activating the perforation knife from the central processing unit. The CPU uses the image and based on the distance between the seal region and the perforated line, counts pixels to result in an actual pixel count. The CPU then calculates a pixel count error by subtracting the actual pixel count from a predetermined pixel count setpoint.

Abstract: An insulation plug is disclosed for mounting in and generally filling a central recess in the die face of an extrusion die in an underwater pelletizer. The insulation plug is in the form of a rigid circular plate that substantially fills the recess in the die face oriented in opposed relation to a cutter hub and cutter knives of the underwater pelletizer and is secured in place by a fastening bolt. The insulation plug may be made of solid one piece construction or hollow two piece construction, but is made of a material having low heat conductivity. The plug has raised and recessed portions to form bottom and side air gaps within the recess. The plug reduces the transfer of heat from the molten polymer being extruded through orifices in the die plate to water circulating through a water box of the underwater pelletizer.

Abstract: An insulation plug is disclosed for mounting in and generally filling a central recess in the die face of an extrusion die in an underwater pelletizer. The insulation plug is in the form of a rigid circular plate that substantially fills the recess in the die face oriented in opposed relation to a cutter hub and cutter knives of the underwater pelletizer and is secured in place by a fastening bolt. The insulation plug may be made of solid one piece construction or hollow two piece construction, but is made of a material having low heat conductivity. The plug has raised and recessed portions to form bottom and side air gaps within the recess. The plug reduces the transfer of heat from the molten polymer being extruded through orifices in the die plate to water circulating through a water box of the underwater pelletizer.