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Apparatus and method for flexing web

A web, bending technology used in the field of web handling

Inactive Publication Date: 2010-02-03
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Minimum line strain cure temperature along with maximum cure shrinkage and pad factor can help to minimize curl, but there are certain limitations

Method used

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  • Apparatus and method for flexing web
  • Apparatus and method for flexing web
  • Apparatus and method for flexing web

Examples

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Embodiment Construction

[0018] In the following detailed description, reference is made to the accompanying drawings, which form a part hereof, and which show, by way of illustration, embodiments in which the invention may be practiced. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present disclosure. Accordingly, the following detailed description is not intended to be in a limiting sense, and the scope of the invention is defined by the appended claims.

[0019] The present invention relates to systems and methods for creating strain in a web that can be used to remove curl from the web. Optionally, the system can also be used to impart a predetermined curl to the web. The system and method can be used with webs having a single layer or multiple layers. The system includes first and second rotating assemblies with a gap therebetween. The first and second assemblies are co-rotating, which means t...

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Abstract

An apparatus and method for flexing a web is disclosed. The web passes over two co-rotating members (122), such as rollers or belts, which are separated by a small adjustable gap (G). The web travelsaround the first rotating member (111), is peeled off in the vicinity of the gap (G), bent back on itself in a small radius (R) and reattached on the second co-rotating member (121). The location of the small radius is fixed with a closed loop control system sensing the radius location and controlling the relative velocity of the two members (12). Strain in the web is adjusted with the size of thesmall radius, which is controlled by the adjustable gap and radius location.

Description

technical field [0001] The present invention relates generally to web handling, and in particular to flexing a web to create permanent strain. Background technique [0002] Curl often occurs in multilayer webs during web handling operations. The curl is defined by the web's tendency to deviate from a generally flat or planar orientation when no external force is acting on the web. In multilayer web systems, curl can be controlled by carefully matching the strains of the webs that are laminated together. In direct-coated products, this strain matching is much more complicated. [0003] Curl in laminated multilayer webs can be controlled by carefully matching the strain of the incoming web. Even more difficult is controlling curl in directly coated products, especially where the liner is placed under high pressure and temperature, creating large strains while the coating cures at close to zero strain. If the strains created by tension, temperature, and processing shrinkage...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B65H23/34B65H20/06
CPCB65H2553/40B65H2511/112B65H23/34B65H20/06B65H2513/104B65H2513/10B65H2220/02
Inventor 罗纳德·P·斯万松
Owner 3M INNOVATIVE PROPERTIES CO
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