A machine for producing coils of prestretched extendible film has a prestretching unit (10) for prestretching the film (F) and a winding unit (100) for winding the film in a coil provided with a series of rollers around which the advancing film winds partially; the winding unit comprises a winding roller (104) in pressing contact against the coil (R) of the prestretched film in winding progress; to obtain coils of constant diameter and high winding quality the final contact position is varied of the winding roller (104) against the coil (R) according to the length of the wound film and according to the required diameter of coil.

The invention relates to a reel-up 3 for receiving and winding into a roll 4 a paper web W that arrives from a drying cylinder 2 in a paper making machine and which drying cylinder 2 is located upstream of the reel-up 3 and which paper web W follows a path of travel from the drying cylinder 2 to the reel-up 3. The reel-up 3 comprises a rotatably mounted reel spool 5 onto which a paper web W can be wound to create a paper roll 4 of increasing diameter and an endless flexible belt 6 mounted for rotation along a predetermined path of travel such that the flexible belt 6 forms a loop. The flexible belt 6 is positioned adjacent to the reel spool 5 to engage the paper web W against the reel spool 5 during winding. The reel-up 3 is arranged to receive the paper web W at the end of a path of travel of the paper web W which ends in a point of contact P with the flexible belt 6 where the paper web W meets the flexible belt 6 such that a wedge-shaped space WS is formed between the flexible belt 6 and the paper web W. From the point of contact P, the paper web W will be carried by the flexible belt 6 to the reel-spool 5. According to the invention, the reel-up 3 further comprises an air deflector 8 for diverting or evacuating air away from the wedge-shaped space WS formed between the flexible belt 6 and the paper web W. The invention also relates to a method of reeling a paper web.

A rewinding machine is described with a winding cradle defined by three rollers and including a fourth winding roller defining with the first winding roller a cradle in which the web material is pushed by a winding core to the beginning of each winding cycle, to cause severing of the web material without the need for controlled mechanical parts.

The present invention relates to systems and methods for calculating the additional local stretching of a moving web through a converting process in order, during rewinding, to find the position of defects in the web that were identified during winding and stopping the web with the web defect close to or at a defect correcting station. The method comprises, during rewinding of the web, the steps of detecting position markers (PM(n)) applied during winding of the web (5), measuring the distance between the position markers, calculating the additional local stretching between the position markers occurring during rewinding, applying the calculated additional local stretching to the known position of a following web defect to determine an estimated position of that web defect in the rewinding web. A method for correcting a web defect comprises the step of subsequently stopping the web with the web defect at, or close to, a defect repairing station (38).

In one aspect, a method for manufacturing a continuous sheet for use within a roller shade may generally include positioning a portion of a first sheet web adjacent to a mandrel, positioning a portion of a second sheet web adjacent to the mandrel and winding the first and second sheet webs around the mandrel such that a folded segment of the first sheet web is secured to a base segment of the second sheet web.

In one aspect, a method for manufacturing a continuous sheet for use within a roller shade may generally include positioning a portion of a first sheet web adjacent to a mandrel, positioning a portion of a second sheet web adjacent to the mandrel and winding the first and second sheet webs around the mandrel such that a folded segment of the first sheet web is secured to a base segment of the second sheet web.

The present invention relates to systems and methods for calculating the additional local stretching of a moving web through a converting process in order, during rewinding, to find the position of defects in the web that were identified during winding and stopping the web with the web defect close to or at a defect correcting station. The method comprises, during rewinding of the web, the steps of detecting position markers (PM(n)) applied during winding of the web (5), measuring the distance between the position markers, calculating the additional local stretching between the position markers occurring during rewinding, applying the calculated additional local stretching to the known position of a following web defect to determine an estimated position of that web defect in the rewinding web. A method for correcting a web defect comprises the step of subsequently stopping the web with the web defect at, or close to, a defect repairing station (38).

A rotating portion, mandrel, or spool for use with an automatic tarping equipment attachment is provided. The rotating portion, mandrel, or spool can including a central portion, a first end portion, and a second end portion. The central portion can be constructed to enhance cylindrical dimensional conformity to aid in prevention of bunching or uneven weight distribution during rolling or unrolling of a tarpaulin therefrom, and the first end portion and the second end portion can be used to reinforce end portions of the central portion.