Abstract: A rotary cutting die assembly is provided that includes a die cylinder, an anvil, and a die board mounted to the die cylinder. The die board includes a series of trim cutting blades. Disposed on the outside of each trim cutting blade is a trim stripper. Secured to the die board adjacent the outside of the trim strippers is a series of retainers that generally retain the trim strippers between trip cutting blades and the retainers. This generally prevents cut pieces of trim from being packed and wedged into a gap between the trim cutting blades and the trim strippers.

Abstract: A rotary cutting die including a curved die board having a series of product ejector openings formed completely through the die board. Secured to an inner surface of the die board is a substrate. A series of product ejectors are secured to the substrate and project therefrom through the product ejector openings and past an outer surface of the die board. These product ejectors function to engage a portion of a die cut product passing through the nip and exert a force on the die cut product which assists in separating the die cut product from the rotary cutting die.

Abstract: A rotary cutting die apparatus is provided for die cutting corrugated board. The apparatus comprises a die board having one or more openings formed therein. A product ejector is secured in the one or more openings for engaging a portion of a die cut product and separating the die cut product from the cutting die. Each product ejector comprises compressible material and includes a main body and one or more tabs integral with the main body or operatively associated with the main body, wherein the tabs are secured to the openings or to another portion of the die board.

Abstract: A rotary cutting die apparatus for die cutting corrugated board. The apparatus comprises a die board having one or more opening formed therein. Inserts are seated and secured in the openings. Product ejectors for ejecting die cut product are adhered or otherwise secured to the inserts that are in turn secured within the openings in the die board.

Abstract: A rotary cutting die for cutting corrugated board to form a die cut product including one or more product ejectors that are specifically configured to avoid crushing the flutes of the die cut product.

Abstract: A rotary cutting die for cutting corrugated board to form a die cut product including one or more product ejectors that are specifically configured to avoid crushing the flutes of the die cut product.

Abstract: A rotary cutting die including a curved die board having a series of product ejector openings formed completely through the die board. Secured to an inner surface of the die board is a substrate. A series of product ejectors are secured to the substrate and project therefrom through the product ejector openings and past an outer surface of the die board. These product ejectors function to engage a portion of a die cut product passing through the nip and exert a force on the die cut product which assists in separating the die cut product from the rotary cutting die.

Abstract: A rotary cutting die apparatus is provided for die cutting corrugated board. The apparatus comprises a die board having one or more openings formed therein. A product ejector is secured in the one or more openings for engaging a portion of a die cut product and separating the die cut product from the cutting die. Each product ejector comprises compressible material and includes a main body and one or more tabs integral with the main body or operatively associated with the main body, wherein the tabs are secured to the openings or to another portion of the die board.

Abstract: A rotary cutting die includes a curved die board having one or more product ejector openings formed therein. A compressible product ejector is disposed in the product ejector opening for engaging a die cut product and assisting in the separation of the die cut product from the rotary cutting die. Adjacent the product ejector opening is a cutting or scoring rule for cutting or scoring corrugated board. A reinforcement member is embedded into the die board between the product ejector opening and the cutting or scoring rule. The reinforcement member reinforces the cutting or scoring rule, as well as the die board adjacent the reinforcement member.

Abstract: A rotary cutting die for cutting corrugated board includes a die board having an opening therein. Extending through the opening is a cutting or scoring rule. Secured within the opening is one or more inserts that support one or more product ejectors for assisting in separating a die cut product from the cutting die.

Abstract: An apparatus configured to cooperate with a rotating anvil to cut corrugated board comprises a rotary cutting die configured to rotate in one direction and to cooperate with the anvil to cut corrugated board. The cutting die includes a base and at least one scrap cutting blade and a scrap stripper that comprises one or more fingers that project from the base at an incline and which is slanted forwardly in the direction of rotation of the cutting die for stripping cut scrap pieces of corrugated board from the blade.

Abstract: A scoring or cutting assembly forms a part of a cutting die used to score and cut corrugated board. The scoring or cutting assembly includes a cutting or scoring rule secured to a die board. First and second elastomers are secured on the die board such that the scoring or cutting rule extends between the elastomers and there is defined a space between the scoring or cutting rule in each of the elastomers. There is also provided a pair of retainers, each retainer being secured to the die board adjacent an outboard side of the elastomers. During a cutting or scoring operation, the elastomers engage the corrugated board on opposite sides of the scoring or cutting rule and apply and inward force to the corrugated board towards the scoring or cutting rule. This causes the corrugated board to resist cracking on opposite sides of the scoring or cutting rule.

Abstract: The present invention entails a rotary cutting die having one or more scrap strippers secured thereon for stripping scrap corrugated board pieces from adjacently disposed scrap cutting blades during a corrugated board die cutting operation. Each scrap stripper comprises a resilient member having a base and an angled flexible finger extending from the base so as to define an open area between the angled finger and the base. During a die cutting operation, the entire scrap stripper including the angled finger and base is compressed as the stripper passes through the nip defined between the cutting die and an associated anvil. As the stripper exits the nip, it expands causing the underlying scrap piece to be stripped from adjacently disposed blades. In addition, the angled finger extending from the base extends outwardly and engages the underlying cut piece of scrap and pushes or urges the cut scrap against the underlying anvil.

Abstract: A rotary cutting die includes a trim stripper having a generally pentagonal shape which forcibly separates severed trim scrap from cut corrugated board, directing the scrap material generally downwardly and away from the trimmed corrugated board product. The pentagonal shaped stripping member mounts on the surface of a die board adjacent a trim cutting blade and is formed of a resilient material, such as closed cell rubber, which deforms elastically when forced into contact with the incoming blank of material. The angled nature of the stripper surface allows the stripper to smoothly contact and capture the leading edge of the blank, greatly reducing the potential for an initial destructive misalignment at the stripper-blank interface.

Abstract: A die board on a rotary cutting die includes one or more scrap strippers to remove scrap from adjacent cutting blades secured to the die board. The rotary cutting die cooperates with a rotary anvil to cut corrugated board directed through a nip. Each scrap stripper includes a compressible base with a compressible post inserted into and extending from an opening in the base. As the corrugated board is directed through the nip, each scrap stripper compresses, causing the post(s) to flex against a scrap area and crease the scrap area while the cutting blade(s) cut the scrap area. As the scrap stripper exits the nip, the scrap stripper expands and strips the cut scrap piece from the cutting blade(s) and the corrugated board.

Abstract: A rule for use in conjunction with a cutting die and adapted to be received within an elongated slit formed in a die board. The rule includes an upper edge and a lower edge, and a main body extending between the lower and upper edges. A series of notches are generally uniformly formed and spaced about a lower portion of the rule such that the respective notches effectively extend through the lower edge of the rule and are open along the lower edge of the rule. The series or group of notches function to facilitate the curving of the rule and further function to bridge certain uncut sections of the die board that exist within one or more slits formed in the die board.

Abstract: A cutting die for cutting corrugated board that includes a quick attach and detach securing mechanism. The blade securing mechanism allows a blade to be quickly and easily removed from a die board that forms a part of the cutting die, and allows a replacement blade to be quickly and easily inserted into the die board. The die board includes a first slit for receiving a blade and a second slit adjacent the first slit. The blade securing mechanism is associated with the second slit for spreading the second slit and effectively closing the first slit against the blade so as to secure the blade within the first slit.

Abstract: An elongated rubber ejector is mounted to a die board that forms a part of a cutting die and the ejector functions to engage cut corrugated board and eject the same from the cutting die. The rubber ejector includes upper and lower faces or surfaces with each face including a series of spaced apart raised lugs with a series of spaced apart voids or relief areas disposed between the lugs. Lugs and relief areas formed on one face are staggered with respect to the lugs and relief areas formed on the other face. In practice, the lugs are compressed during a die cutting operation. Once the corrugated board has been cut and the die board and an opposed anvil have been moved apart, the lugs and the ejector expand and in the process the rubber ejector engages the cut corrugated board and ejects the same from the cutting die.

Abstract: Toothed perforating rules upon the die roll of the rotary die apparatus form tear strips, punchouts, reverse fold lines, nicking connections and similar weakened or frangible sections in corrugated paperboard sheets during passage thereof through the nip between the die and anvil rolls of the apparatus. The teeth of the die rules are tapered and sharpened, and produce perforations in the paperboard panel that decrease in size with increasing distance from the inner liner of the paperboard sheet. The teeth produce an array of relatively long slits in the inner liner of the sheet, and underlying shorter slits within at least one other ply of the panel. The toothed die members may extend at any desired angle or angles relative to the machine direction of the apparatus and/or relative to the direction of the corrugations within the paperboard panel.

Abstract: The present invention provides an apparatus and method for perforating and creasing a paperboard sheet utilizing a rotary die process. The method and apparatus employ a die rule that comprises a base adapted to be attached to a die roll of a rotary die machine, a plurality of tooth elements, and open spaces between at least some of the plurality of tooth elements. Each of the plurality of tooth elements comprises a body portion that is fixed to and extends radially outwardly from the die roll and a laterally-tapered tooth portion. Each open space is defined by lateral portions of adjacent teeth element body portions and by the base outer edge. The body portion preferably extends radially outwardly from the base so that substantially all of the tooth portion penetrates the outer surface of the paperboard, and the base outer edge extends outwardly so that it engages and creases the inner surface of the paperboard.