The tubular core (1) for tissue paper rolls consists of at least one tape (10) of tissue paper with one or more spirally wound tapes, such that the pitch of the winding helix is much smaller than the width of the tape (10) itself, so that two consecutive coils (S) are partially overlapped. In the tubular core (1) there may be several tissue paper tapes (10) wound simultaneously in relative helical coils preferably offset along the longitudinal axis of the same tubular core (1). The coils (S) of each tape (10), in the areas in which they are partially overlapped, are mutually fixed by means of an adhesive film (2) interposed between them. The adhesive film (2) is preferably continuous according to the winding direction of the coils (S) themselves. The presence of said adhesive films (2) produces a solid connection between the helical coils (S) and confers the necessary structural resistance to the tubular core (1) to receive, for wrapping on it, a tissue paper roll for hygienic use or domestic or other tape material.

The invention provides for a reduction in the period of time necessary for recycling a separator winding core around which a nonaqueous electrolyte secondary battery separator is wound. The separator winding core is described by the Munsell color system as (i) a lightness of not less than 3.0 but not more than 9.2 and (ii) a chroma of not less than 0.5.

A paperboard carrier suitable for use with textiles may include one or more strips of paperboard secured together to form a hollow tubular body, the body having an outer surface, and a coating covering some or all of the outer surface. The coating comprises a coating agent such as a silicon resin dispersed in a solvent such as isopropyl alcohol and little or no water. The coating may be applied to the outer surface by using a plurality spray nozzles arranged axially or circumferentially about the carrier.

An assembly comprises a substantially cylindrical tape winding surface and first and second flanges co-formed with the winding surface to form a unitary hub structure. The tape winding surface extends along an axis from a first end to a second end, and the first and second flanges extend radially from the first and second ends of the tape winding surface, respectively. The tape winding surface and the first and second flanges are co-formed of a unitary hub material having a Young's modulus of at least about one million psi.

An assembly comprises a substantially cylindrical tape winding surface and first and second flanges co-formed with the winding surface to form a unitary hub structure. The tape winding surface extends along an axis from a first end to a second end, and the first and second flanges extend radially from the first and second ends of the tape winding surface, respectively. The tape winding surface and the first and second flanges are co-formed of a unitary hub material having a Young's modulus of at least about one million psi.

A core for winding yarn can include an oblong hollow body and a laser-cut structure disposed through a portion of a wall of the hollow body adjacent to an end of the hollow body. A method of cutting a core for winding yarn can include providing a core comprising an oblong hollow body, and irradiating a wall of the hollow body with a laser beam to form a laser-cut structure. A method of winding yarn can include placing a core on a winding mandrel, placing a tail of a length of yarn through a laser-cut structure of the core, and spinning the core to wind the length of yarn around the core. A bobbin can include yarn wound around a core including a laser-cut structure.

A method for assembling a reel comprising a first flange, a second flange and a barrel is disclosed. This method comprises (i) securing at least one spring-loaded magnetic guide to a base; (ii) positioning the first flange over the at least one spring-loaded magnetic guide and the base, so that a distal end of the at least one spring-loaded magnetic guide is inserted through a first hole in the first flange, (iii) connecting the barrel to the first flange, (iv) connecting the second flange to the barrel so that the barrel is located between the first and second flanges, (v) inserting at least one threaded fastener through a second hole in the second flange such that a distal end of the at least one threaded fastener is magnetically attached to the distal end of the at least one spring-loaded magnetic guide, and (vi) connecting the at least one threaded fastener to the first flange to form the reel. Also disclosed are the structures of the spring loaded magnetic guide.

A method for assembling a reel comprising a first flange, a second flange and a barrel is disclosed. This method comprises (i) securing at least one spring-loaded magnetic guide to a base; (ii) positioning the first flange over the at least one spring-loaded magnetic guide and the base, so that a distal end of the at least one spring-loaded magnetic guide is inserted through a first hole in the first flange, (iii) connecting the barrel to the first flange, (iv) connecting the second flange to the barrel so that the barrel is located between the first and second flanges, (v) inserting at least one threaded fastener through a second hole in the second flange such that a distal end of the at least one threaded fastener is magnetically attached to the distal end of the at least one spring-loaded magnetic guide, and (vi) connecting the at least one threaded fastener to the first flange to form the reel. Also disclosed are the structures of the spring loaded magnetic guide.

A method for producing a convolute paper core of a desired width and thickness, the method including unwinding paper from a paper roll, thereby creating unwound paper, conveying the unwound paper to a cutting position in a feeding direction, cutting the unwound paper, thereby creating a paper sheet having a length L, conveying the paper sheet from the cutting position to a mandrel in a winding direction, wherein the winding direction is perpendicular to the feeding direction, adhesively and convolutely winding the paper sheet on the mandrel so as to produce a paper core, so that a width W of the paper core is equal to the length L, and repeating the steps of unwinding, conveying, cutting, conveying and adhesively and convolutely winding a plurality of paper sheets until the paper core has the desired thickness.

A method for producing a convolute paper core of a desired width and thickness, the method including unwinding paper from a paper roll, thereby creating unwound paper, conveying the unwound paper to a cutting position in a feeding direction, cutting the unwound paper, thereby creating a paper sheet having a length L, conveying the paper sheet from the cutting position to a mandrel in a winding direction, wherein the winding direction is perpendicular to the feeding direction, adhesively and convolutely winding the paper sheet on the mandrel so as to produce a paper core, so that a width W of the paper core is equal to the length L, and repeating the steps of unwinding, conveying, cutting, conveying and adhesively and convolutely winding a plurality of paper sheets until the paper core has the desired thickness.