US 6,001,219 A · Water jet edge trimming station for use in papermaking machine

Abstract

A water jet edge trimming station for trimming the edges of coated paper during on-machine operation includes backsplash compensating features. The edge trimming station has a cutting station over which the web travels to be cut. The water jet travels along a water jet axis to a point of impingement at the cutting station to cut the web. The cutting station has an effluent receiving aperture at the point of impingement. A negative pressure mixing zone located below the aperture draws effluent by-products or backsplash associated with cutting of the web below the cutting surface of the web. The water jet axis is offset a first predetermined angle chosen relative to a normal axis passing at right angles through the point of impingement to reduce backsplash. The water axis jet is rotated about the normal axis by a second predetermined angle to direct the effluent by-products away from the water jet nozzle and the traveling web. The water jet cutting apparatus has positive air pressure chamber surrounding the nozzle head of the water jet to maintain an air flow over the nozzle head driving effluent backsplash away from the nozzle head.

Claims25

Dependent claims

A water jet edge trimming station for trimming an edge of a traveling paper web in a papermaking machine, comprising:

a water jet apparatus supported above said web for directing a water jet towards a point of impingement against said web to cut through said web and form an edge trim piece separate from said web, and said water jet forming effluent by-products as it cuts said web;
a support table positioned below said water jet and over which at least an edge portion of said web travels, said support table including a cutting station;
said cutting station including a cutting surface for withstanding cutting and wear associated with the paper striking said cutting surface, said cutting station including an effluent receiving aperture extending from the cutting surface through the cutting station and positioned directly below the point of impingement of said water jet through which passes said water jet after cutting through said web,
a negative pressure apparatus mounted directly below the cutting station and surrounding the effluent receiving aperture adapted to draw said water jet and said effluent by-products through said receiving aperture to reduce backsplash of effluent by-products;
and,
a trim removal chute separate and distinct from said negative pressure apparatus, said trim removal chute being positioned adjacent and downstream of said support table for guiding said edge trim piece away from the web.

3 more elements

A water jet edge trimming station for trimming an edge of a traveling paper web in a papermaking machine, comprising:

a water jet supported above a substantially flat traveling surface of said web for directing a water jet through a nozzle along a water jet axis towards a point of impingement against said web to cut through said web and form an edge trim piece separate from said web, said water jet forming effluent by-products as the water jet cuts said web;
said water jet axis having a first predetermined angle chosen relative to a normal axis passing at a right angle through the point of impingement of said web in the range of 5.degree. to 45.degree. to reduce backsplash of effluent by-products onto said nozzle, and said water jet having a second predetermined angle chosen rotated about said normal axis in the range of 5.degree. to 135.degree. to direct effluent by-products away from the nozzle and traveling web and towards said edge trim piece;
a support table positioned below said water jet and over which at least an edge portion of said web travels, said support table including a cutting station;
and,
said cutting station including a cutting surface for withstanding cutting and wear associated with the paper striking said cutting surface, said cutting station including an effluent receiving aperture extending from the cutting surface through the cutting station and positioned directly below the point of impingement of said water jet through which passes said water jet after cutting through said web;
said cutting station including a negative pressure apparatus mounted directly below the cutting station and surrounding the effluent receiving aperture adapted to draw said water jet and said effluent by-products through said receiving aperture to reduce backsplash of effluent by-products;
and,
a trim removal chute separate and distinct from said negative pressure apparatus, said trim removal chute being positioned adjacent and downstream of said support table for guiding said edge trim piece away from the web.

5 more elements

Dependencies are inferred from the claim text.

Water jet edge trimming station for use in papermaking machine

Life of this patent

Water jet edge trimming station for use in papermaking machine

Life of this patent

Abstract

Claims25