Method and constructions for moisture sensitive layers and structures having reduced moisture content in moisture sensitive layers
Alternating layers of a first moisture sensitive layer are formed with a second desiccant containing layer. The desiccant containing layer removes moisture from the first moisture sensitive layer and maintains the first layer in a relatively dry condition.
1. A roll of alternating layers of films or sheets for storage and/or shipment of an interlayer film comprising:
an interlayer film comprising PVB or ethylene vinyl acetate; and
a desiccant-containing film juxtaposed with the interlayer film;
wherein the juxtaposed interlayer film and the desiccant-containing film are wound into a roll of alternating layers wherein the interlayer film and the desiccant-containing film directly contact each other;
wherein the desiccant-containing film prevents the blocking of the interlayer film;
wherein the desiccant-containing film is capable of removing moisture from the interlayer film; and
wherein the desiccant-containing film is readily removable from the interlayer film to recover the interlayer film.
2. The roll of claim 1 wherein the desiccant-containing film comprises one or more than one permeable support layer.
3. The roll of claim 1 wherein the interlayer film is a thermochromic PVB.
4. The roll of claim 1 wherein the roll is packaged or wrapped in an external film that cooperates with the desiccant-containing film or sheet to provide an interlayer film exhibiting reduced moisture.
5. The roll of claim 1 wherein the desiccant-containing film comprises polyethylene and calcium oxide particles.
6. The roll of claim 5 wherein the desiccant-containing film is a polyethylene film having calcium oxide particles dispersed therein which is overcoated on one or both sides with a moisture-permeable low density polyethylene.
7. The roll of claim 1 wherein the interlayer film and the desiccant-containing film are both textured.
8. The roll of claim 1 further comprising a sealed bag, wherein the bag contains the roll therein.
9. The roll of claim 8 wherein the bag comprises a foil lining.
10. The roll of claim 2 wherein the permeable support layer is a nonwoven mesh or fabric.
11. The roll of claim 5 wherein the polyethylene is high density polyethylene.
12. The roll of claim 1 wherein the moisture content of the interlayer film is below about 0.4%.
13. The roll of claim 1 wherein the desiccant-containing film is longer than the interlayer film, and wherein the roll further comprises one or more wraps of the desiccant-containing film on an outer surface of the roll.
14. The roll of claim 1 wherein the interlayer film comprises PVB.
15. A roll of alternating layers of films or sheets for storage and/or shipment of an interlayer film comprising:
an interlayer film comprising PVB or ethylene vinyl acetate; and
a desiccant-containing film juxtaposed with the interlayer film;
wherein the juxtaposed interlayer film and the desiccant-containing film are wound into a roll of alternating layers wherein the interlayer film and the desiccant-containing film directly contact each other;
wherein the desiccant-containing film prevents the blocking of the interlayer film;
wherein the desiccant-containing film is capable of removing moisture from the interlayer film; and
wherein the desiccant-containing film is not permanently bonded to the interlayer film.
16. The roll of claim 15 wherein the interlayer film is a thermochromic PVB.
17. The roll of claim 15 , wherein the desiccant-containing film comprises a permeable support layer.
18. The roll of claim 17 , wherein the permeable support layer is a nonwoven mesh or fabric.
19. The roll of claim 17 , wherein the desiccant-containing film further comprises a tri-layer of calcium oxide-loaded high density polyethylene positioned between two layers of low density polyethylene, wherein the tri-layer is bonded to the permeable support layer.
20. The roll of claim 15 , wherein the interlayer film and the desiccant-containing film are both textured.
21. The roll of claim 15 , wherein the desiccant-containing film is longer than the interlayer film, and wherein the roll further comprises one or more wraps of the desiccant-containing film on an outer surface of the roll.
22. The roll of claim 15 , wherein the moisture content of the interlayer film is below about 0.4%.