| 主权项 |
1. A method of preparing a corrugated product having improved insulative properties, comprising the steps of:
a. providing a first paper liner that is substantially planar and has a first side and second side; b. providing a second paper liner having a plurality of flutes each having a peak and a trough; c. preparing an adhesive composition having improved insulative properties, comprising the steps of:
i. combining a high amylose starch component that has an amylose content greater than 50%, an alkaline component, sodium tetraborate, water, and about 0.5 to about 5 wet basis weight percent of a plurality of expandable microspheres to form a starch mixture;ii. cooking said high amylose starch mixture to form a cooked starch mixture;iii. adding unmodified starch component to said cooked starch mixture; andiv. adding a plurality of expandable microspheres to said cooked starch mixture; d. applying said adhesive composition to the peaks of each of said flutes; e. mating the peaks of said flutes with a surface of said first side of said planar paper liner to form a composite structure wherein the first paper liner and the second paper liner contact each other at said peaks of said flutes; and f. curing said adhesive composition in said composite structure by heating to a first temperature and to a second temperature, wherein said first temperature and said second temperature differ by about 20° F. to about 40° F. |
