Method of manufacturing film for lamination
AssigneeGeneral Binding Corporation
InventorLuis Joson
Life of this patent
Estimating the term…
Abstract
A method of one sided laminating and a one sided laminated product using nylon laminating film reduces the tendency of one-sided laminations to curl toward the laminating side due to moisture swelling of the paper side of the lamination.
Claims14
A method for manufacturing a soft cover book comprising the steps of:
- providing a stack of pages;
- providing a length of flexible paper material to be used as a soft cover for said stack of pages, said flexible paper material being of a thickness which is susceptible to moisture induced corner curl;
- and
- applying onto only one side of the length of the paper material a coextensive nylon film;
- the nylon film having substantially equivalent ambient moisture absorption, measured as a percentage moisture content, as the flexible paper material to prevent moisture induced corner curl.
A one sided lamination for a flexible soft cover for a soft cover book having at least one free corner, consisting essentially of:
- a flexible, thin paper layer forming a cover to the book and being of a thickness which causes the paper layer to be susceptible to corner curl;
- a coextensive clear nylon film layer covering said paper layer, said nylon film layer having substantially the same ambient moisture absorption, measured as a percentage moisture content as the flexible, thin paper layer.
A method for one side thermally laminating a sheet of paper for a flexible soft cover for a soft cover book having at least one free corner, comprising:
- providing a length of flexible paper to be used as a flexible soft cover for a book said flexible paper being of a thickness which causes the paper to be susceptible to corner curl;
- and
- thermally laminating onto one side of the length of paper a nylon film comprising a material having a composition with the capacity to absorb moisture in the range between 5 and 9.5% moisture content at typical room temperature, to prevent corner curl of said soft cover.
A method for preventing curl in a one sided thermal lamination for a flexible soft cover for a soft cover book having at least one free corner, comprising the steps of:
- providing a flexible paper sheet to act as a flexible soft cover to be laminated, the paper sheet being of a thickness which causes the paper to be susceptible to corner curl;
- laminating a nylon film onto said sheet, using heat and pressure, said film selected to comprise substantially the same rate of elongation in the presence of humidity as said sheet to prevent corner curl by moisture absorption.
Dependencies are inferred from the claim text.