Method and apparatus for manufacturing corrugated paperboard
AssigneeInterpac Ltd
InventorCharles Tatton Smith
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Abstract
A method for manufacturing corrugated paperboard is disclosed. The method comprises: directing a corrugating medium from a corrugating medium supply roll to a pair of corrugating rolls; and operating the pair of corrugating rolls to corrugate the corrugating medium; wherein each corrugating roll is operated at ambient temperature; and wherein the step of operating the pair of corrugating rolls to corrugate the corrugating medium comprises forming a fluted web in which the corrugating medium substantially conforms around a plurality of corrugator peaks and is spaced from a plurality of corrugator troughs in at least one of the pair of corrugating rolls.
Claims13
A method for manufacturing corrugated paperboard, the method comprising:
- directing an unheated corrugating medium from a corrugating medium supply roll to a pair of corrugating rolls comprising a first corrugating roll and a second corrugating roll;
- operating the pair of corrugating rolls to corrugate the unheated corrugating medium;
- employing a vacuum system to retain the unheated corrugating medium, when corrugated into a fluted web, on the second corrugating roll for a predefined part of a revolution;
- and
- bonding a first liner to a first side of the fluted web to form a single-faced web whilst the fluted web is retained on the second corrugating roll by the vacuum system;
- wherein each corrugating roll is operated at ambient temperature;
- wherein manufacturing the corrugated paperboard is without the use of a heat source, at least up to and including formation of corrugations in the unheated corrugating medium;
- wherein a diameter of the first corrugating roll is at least 20% less than a diameter of the second corrugating roll;
- and
- wherein the vacuum system holds the flutes of the fluted web in place, against resilient forces urging the unheated corrugating medium to spring back to a flat configuration, at least from formation of the fluted web until the first liner is bonded to the fluted web.
An apparatus for manufacturing corrugated paperboard, the apparatus comprising:
- a pair of corrugating rolls comprising a first corrugating roll and a second corrugating roll configured to corrugate an unheated corrugating medium when operated at ambient temperature;
- and
- a vacuum system configured to retain the unheated corrugating medium, when corrugated into a fluted web, on the second corrugating roll for a predefined part of a revolution;
- and
- a first bonding assembly arranged for bonding a first liner to a first side of the fluted web to form a single-faced web whilst the fluted web is retained on the second corrugating roll by the vacuum system;
- wherein the apparatus is configured to manufacture the corrugated paperboard without the use of a heat source, at least up to and including formation of corrugations in the unheated corrugating medium;
- wherein a diameter of the first corrugating roll is at least 20% less than a diameter of the second corrugating roll;
- and
- wherein the vacuum system is configured to hold the flutes of the fluted web in place, against resilient forces urging the unheated corrugating medium to spring back to a flat configuration, at least from formation of the fluted web until the first liner is bonded to the fluted web.
Dependencies are inferred from the claim text.