Methods for packaging fibrous materials
Disclosed are methods for packaging fibrous materials such as cellulose acetate tow bales. The method may comprise placed a fibrous material between an upper sheet and a lower sheet, folding the upper and lower sheets around the fibrous material, and connecting the upper sheet and lower sheet with a tape, such as a pressure sensitive adhesive tape.
1. A method for packaging a fibrous material, wherein the fibrous material is cellulose acetate, the method comprising:
a. placing the fibrous material between at least an upper sheet and a lower sheet, wherein the upper sheet has a surface area that is greater than a surface area of an upper surface of the fibrous material and wherein the lower sheet has a surface area that is greater than a surface area of a lower surface of the fibrous material;
b. folding a portion of the lower sheet on opposing sides of the fibrous material to form lower folds along opposing edges of the opposing sides;
c. folding a portion of the upper sheet on the opposing sides of the fibrous material to form upper folds along opposing edges of the opposing sides;
d. applying a perimeter pass of a tape to a perimeter of the fibrous material to form a packaged fibrous bale, wherein the tape comprises an adhesive layer to connect the upper sheet and the lower sheet, wherein the tape has a tensile strength from 10 to 175 N/cm, inclusive; and
e. compressing the fibrous material with a force from 45 to 455 metric tonnes, prior to placing the fibrous material between at least the upper sheet and the lower sheet, or after placing the fibrous material between at least the upper sheet and the lower sheet but prior to step b;
wherein the upper and lower sheets comprise a polymer film, and
wherein the fibrous material is not restrained using straps.
2. The method of claim 1 , wherein the tape has a surface area that covers at least 5% of a side surface area of the fibrous material.
3. The method of claim 1 wherein the upper sheet overlaps the lower sheet on each side of the fibrous material.
4. The method of claim 1 wherein the lower sheet overlaps the upper sheet on each side of the fibrous material.
5. The method of claim 1 wherein the method further comprises removing air bubbles from under the tape after the tape is applied to the perimeter.
6. The method of claim 1 wherein the tape has a shear strength from 0.5 N/cm 2 to 10 N/cm 2 .
7. The method of claim 1 wherein the lower sheet and the upper sheet overlap by at least 5% of a total height of the packaged fibrous bale in a longitudinal direction of the packaged fibrous bale.
8. The method of claim 1 wherein the lower folds and upper folds are under folds.
9. The method of claim 1 wherein the lower sheet and the upper sheet are selected from the group consisting of cardboard, polyethylene, polypropylene, polybutylene, copolymers thereof and combinations thereof.
10. The method of claim 1 wherein the lower sheet and the upper sheet are woven, coated, knitted, and/or multilayer films.
11. The method of claim 1 wherein the fibrous material of step (a) comprises a non-sealed liner.
12. The method of claim 1 wherein the fibrous material is compressed prior to step (a).
13. The method of claim 1 , wherein the packaged fibrous bale has a compressive force of up to 5 N/cm 2 at 48 hours after the compressing of the fibrous material.