Corrugated paperboard slitter

Claim 2

A process of slitting a web of corrugated paperboard comprising the steps of feeding a web of corrugated paperboard over and in contact with a stationary anvil having at least one expendable insert, supporting the web with the top surface of said insert, using an insert of low friction and good wear characteristics when subjected to rubbing pressure with the web, rotating a circular cutting blade on an axis parallel to said insert, slitting the web as it passes between said blade and the anvil while having an interference fit between said blade and insert so that the blade cuts into the insert, and rotating said blade at a peripherAl surface speed substantially greater than the linear speed of said web.

Claim 3

A process in accordance with claim 1 including rotating the insert after it is worn so as to present an alternate surface on the insert into which the blade may cut, and discarding the insert when worn.

Claim 4

A method in accordance with claim 1 including simultaneously slitting the web with a plurality of spaced blades, using a plurality of aligned inserts, with a discrete insert at the end portions of the anvil for cooperation with a blade slitting trim from the web.

Claim 5

A method in accordance with claim 1 including sucking dust away from the anvil by means of vacuum.

Claim 6

A method in accordance with claim 1 including using anvil inserts made from a polymer plastic material having discrete corners with one corner being juxtaposed to the periphery of the blade.

Claim 7

Slitting apparatus for slitting an elongated continuous web of corrugated paperboard comprising a shaft having at least one slitting blade selectively positioned therealong for slitting the web, an anvil at an elevation below the shaft, means supporting the anvil in a manner preventing the anvil from rotating, said anvil having expendable inserts of low friction material which resist rubbing pressure due to contact with the web, said inserts having a generally flat top surface for supporting the web, and means for positioning the anvil so that the inserts have an interference fit with the periphery of the blade, whereby worn inserts having an excessive number of cuts may be discarded and replaced with a new insert.

Claim 8

Slitting apparatus for slitting an elongated continuous web of corrugated paperboard comprising a shaft having at least one slitting blade selectively positioned therealong for slitting the web, an anvil at an elevation below the shaft, means supporting the anvil in a manner preventing the anvil from rotating, said anvil having expendable inserts of low friction material which resist rubbing pressure due to contact with the web, said inserts having a generally flat top surface for supporting the web, and means for positioning the anvil so that the inserts have an interference fit with the periphery of the blade, whereby worn inserts having an excessive number of cuts may be discarded and replaced with a new insert.

Claim 9

Apparatus in accordance with claim 6 wherein the interference fit between the inserts and the blade is at a corner of the insert.

Claim 10

Apparatus in accordance with claim 6 wherein the interference fit between the inserts and the blade is at a side face of the insert.

Claim 11

Apparatus in accordance with claim 6 wherein the anvil includes a mounting plate for each insert, each mounting plate being removably coupled to the anvil below its respective insert.

Claim 12

Slitting apparatus in accordance with claim 6 wherein the expendable inserts are aligned inserts made from a polymeric plastic material having at least two discrete corners.