US 4,852,820 AGranted

Winding method and apparatus

OwnerGottlieb Looserinventor

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Abstract

A method of winding a continuously moving web, such as a flexible polymer film, by forming leading web edges and contacting them in sequence with a number of cores for adhesion thereon so as to start winding consecutive web portions onto the cores; when a web portion of a predetermined length has been wound onto a given core, the web is cut to form both the trailing edge of the wound web portion as well as the leading edge of the next web portion; instead of using a conventional sticky material, such as an adhesive tape, for adhesion of each leading edge of the web on the corresponding core for initiating winding thereof an electrostatic potential difference is provided between the core surface and the leading edge so that the latter will be caused to electrostatically adhere to the core surface. An apparatus for use in this method comprises a cutting device for separating the moving web and for forming the trailing edge of a preceding portion of the web as well as the leading edge of the next web portion; and a support for rotatably holding a subsequent core close to the web when the next leading edge is formed; the apparatus includes a generator for producing an electrostatic potential difference between each leading edge and the corresponding core for electrostatically adhering the leading edges of the web onto the empty cores.

Claims24

Dependent claims

A method of winding a continuously moving web of a flexible material having at least one electrically insulating surface, comprising the steps of:

feeding the continuously moving web along a predetermined travel path in a predetermined travel direction past electrostatic discharge means and cutting means to a first winding core located at a winding location for forming a coil from said continuously moving web;
winding up a predetermined length of said continuously moving web on said first winding core and thereby forming said coil from said continuously moving web;
substantially stationarily placing, at least in their active position, said electrostatic discharge means and said cutting means at predetermined locations adjacent said predetermined travel path of said continuously moving web;
prior to completely winding up said predetermined length of said continuously moving web on said first winding core, placing a second winding core into a predetermined mutually spaced relationship to said electrostatic discharge means and said cutting means;
upon reaching said predetermined length of said continuously moving web, moving said cutting means through a cutting stroke in order to cut through said continuously moving web and thereby form a trailing edge of said predetermined length of said continuously moving web and a leading edge of a further predetermined length of said continuously moving web to be wound up on said second winding core;
substantially simultaneously with said cutting stroke, energizing said electrostatic discharge means for producing an electrostatic potential difference between said leading edge of said further predetermined length of said continuously moving web and second winding core;
adhering said leading edge of said further predetermined length of said continuously moving web to said second winding core under the action of said predetermined electrostatic potential difference and winding up at least one layer of said continuously moving web on said second winding core;
and
removing said first winding core from said winding location and placing said second winding core into said winding location for winding up said further predetermined length of said continuously moving web on said second winding core.

6 more elements

An apparatus for winding a continuously moving web of a flexible material having at least one electrically insulating surface, comprising:

a web source for feeding the continuously moving web along a predetermined travel path in a predetermined travel direction to a first winding core located at a winding location for forming a coil from said continuously moving web on said first winding core;
a winding drum drivingly engaging said first winding core for forming said coil from said continuously moving web;
web lifting means for lifting said continuously moving web from said winding drum and directing said continuously moving web from said winding drum to said first winding core located at said winding location;
electrostatic discharge means and cutting means substantially stationarily located, at least in their active positions, at predetermined locations adjacent said predetermined travel path of said continuously moving web and upstream of said web lifting means as viewed in said predetermined travel direction of said continuously moving web;
said electrostatic discharge means being arranged upstream of said cutting means as viewed in said predetermined travel direction of said continuously moving web;
said cutting means, during operation, moving through a cutting stroke for cutting through said continuously moving web moving along said predetermined travel path in order to form a trailing edge of a predetermined length of said continuously moving web and a leading edge of a further predetermined length of said continuously moving web;
support means for rotatably supporting a second winding core in a predetermined mutually spaced relationship to said electrostatic discharge means and said cutting means and upstream of said electrostatic discharge means as viewed in said predetermined travel direction of said continuously moving web;
said continuously moving web passing between said winding drum and said second winding core such that said second winding core is drivingly engaged by said winding drum through said continuously moving web;
said electrostatic discharge means, during said cutting stroke of said cutting means being energized for producing an electrostatic potential difference between said leading edge of said further predetermined length of said continuously moving web and said second winding core in order to electrostatically adhere said leading edge of said further predetermined length of said continuously moving web to said second winding core;
and
displacing means for displacing said support means for rotatably supporting said second winding core when containing at least one layer of said further predetermined length of said continuously moving web, to said winding location, after removal from said winding location of a completed roll formed by said predetermined length of said continuously moving web on said first winding core.

8 more elements

Dependencies are inferred from the claim text.