Elastic plastic netting, and pallet load wrapping therewith

Abstract

Plastic netting .[.particularly.]. for wrapping pallet loads, securely to hold the load on the pallet without heat-shrinking of the netting and providing for ventilation of the load, i.e., egress of air from the load or ingress of air to the load; a method of wrapping the load with such netting for such purpose; and the resultant wrapped pallet load.

What is claimed is: .[.1. Plastic netting in the form of a continuous web having strands extending generally longitudinally of the web spaced at intervals transversely of the web and strands extending generally transversely of the web spaced at intervals longitudinally of the web, the netting being formed of a thermoplastic synthetic resin material, the longitudinal and transverse strands being integrally joined at the intersections thereof, the longitudinal strands being elastic to the extent of being stretchable at least 100% when stretched at the rate of 1000% per minute while retaining a substantial degree of elasticity over a relatively long period of time..]. .[.2. Plastic netting as set forth in claim 1 wherein the synthetic resin material comprises a polyolefin..]. 
     
           Plastic netting .[.as set forth in claim 2 wherein the.]. .Iadd.for stretch-wrapping pallet loads, said netting being in the form of a continuous web having strands extending generally longitudinally of the web spaced at intervals transversely of the web and strands extending generally transversely of the web spaced at intervals longitudinally of the web, the netting being formed of a thermoplastic synthetic resin material, the longitudinal and transverse strands being integrally joined at the intersections thereof, the longitudinal strands being elastic to the extent of being stretchable at least 100% when stretched at the rate of 1000% per minute while retaining a sustantial degree of elasticity over a relatively long period of time after having been wrapped around a pallet load with the longitudinal strands extending in the direction of wrap and stretched as the netting is wrapped around the load to bind the load, said .Iaddend.synthetic resin material .[.comprises.]. .Iadd.comprising .Iaddend.a blend of polyolefins. .[.4. Plastic netting as set forth in claim 1 wherein the longitudinal strands are elastic to the extent of 
     
     
        retaining at least 30% of the initial stress at 100% elongation..]. 5. Plastic netting .[.as set forth in claim 4 wherein.]. .Iadd.for stretch-wrapping pallet loads, said netting being in the form of a continuous web having strands extending generally longitudinally of the web spaced at intervals transversely of the web and strands extending generally transversely of the web spaced at intervals longitudinally of the web, the netting being formed of a thermoplastic synthetic resin material, the longitudinal and transverse strands being integrally joined at the intersections thereof, the longitudinal strands being elastic to the extent of being stretchable at least 100% when stretched at the rate of 1000% per minute while retaining a substantial degree of elasticity over a relatively long period of time after having been wrapped around a pallet load with the longitudinal strands extending in the direction of wrap and stretched as the netting is wrapped around the load to bind the load, and wherein the longitudinal strands are elastic to the extent of retaining at least 30% of the initial stress at 100% elongation, and .Iaddend.the longitudinal strands have a tensile strain recovery of at 
     
     
        least 30%. 6. Plastic netting as set forth in claim 5 wherein the 
     
     
        synthetic resin material comprises a polyolefin. 7. Plastic netting as set forth in claim 6 wherein the synthetic resin material comprises a blend of 
     
     
        polyolefins. 8. Plastic netting as set forth in claim 5 wherein the 
     
     
        synthetic resin material comprises polybutylene. 9. Plastic netting as set forth in claim 5 wherein the synthetic resin material comprises 
     
     
        polyethylene. 10. Plastic netting as set forth in claim 5 wherein the 
     
     
        synthetic resin material comprises ethylene vinyl acetate. 11. Plastic netting as set forth in claim 7 wherein the synthetic resin material is a 
     
     
        blend of polybutylene and polypropylene. 12. Plastic netting as set forth in claim 11 wherein the synthetic resin material is a blend of about 90% 
     
     
        polybutylene and 10% polypropylene by weight. 13. Plastic netting as set forth in claim 7 wherein the synthetic resin material is a blend of low 
     
     
        density polyethylene and high density polyethylene. 14. Plastic netting as set forth in claim 13 wherein the synthetic resin material is a blend of about 75% low density polyethylene and 25% high density polyethylene by 
     
     
        weight. 15. Plastic netting as set forth in claim 5 wherein the synthetic resin material is a blend of ethylene vinyl acetate and polypropylene. 
     
     
            Plastic netting as set forth in claim 15 wherein the synthetic resin material is a blend of about 90% ethylene vinyl acetate and 10% 
     
     
        polypropylene by weight. 17. Plastic netting as set forth in claim 5 wherein the transverse strands are substantially thinner than the 
     
     
        longitudinal strands. 18. Plastic netting as set forth in claim 17 wherein the diameter of the transverse strands is about 50%-75% of the diameter of 
     
     
        the longitudinal strands. 19. Plastic netting as set forth in claim 5 wherein the longitudinal and transverse strands have a diameter in the 
     
     
        range from about 0.010 inch to 0.100 inch. 20. Plastic netting as set forth in claim 19 wherein the longitudinal strands are about 0.030-0.050 inch in diameter and the transverse strands are about 0.020-0.040 inch in 
     
     
        diameter. 21. Plastic netting as set forth in claim 5 wherein the spacing of the longitudinal strands transversely of the web is in the range from about 1/4 inch to 10 inches, and the spacing of the transverse strands 
     
     
        longitudinally of the web is in the same range. 22. Plastic netting as set forth in claim 21 wherein the longitudinal strands are spaced about 0.85 
     
     
        inch and the transverse strands are spaced about 1.75 inches. 23. Plastic netting as set forth in claim 22 wherein the synthetic resin material is a blend of about 90% polybutylene and 10% polypropylene by weight and the longitudinal strands are about 0.030-0.050 inch in diameter and the transverse strands are about 0.020-0.040 inch in diameter.  .[.24. Plastic netting in the form of a continuous web having strands extending generally longitudinally of the web spaced at intervals transversely of the web and strands extending generally transversely of the web spaced at intervals longitudinally of the web, the netting being formed of a thermoplastic synthetic resin material, the longitudinal and transverse strands being integrally joined at the intersections thereof, the transverse strands being substantially thinner than the longitudinal strands, the longitudinal strands being elastic to the extent of being stretchable at least 25% while retaining a substantial degree of elasticity over a 
     
     
        relatively long period of time..]. 25. The method of stabilizing a load on a pallet comprising wrapping plastic netting .[.as set forth in claim 1.]. around the load.Iadd., said netting being in the form of a continuous web having strands extending generally longitudinally of the web spaced at intervals transversely of the web and strands extending generally transversely of the web spaced at intervals longitudinally of the web, the netting being formed of a thermoplastic synthetic resin material, the longitudinal and transverse strands being integrally joined at the intersections thereof, the longitudinal strands being elastic to the extent of being stretchable at least 100% when stretched at the rate of 1000% per minute while retaining a substantial degree of elasticity over a relatively long period of time after having been wrapped around a pallet load with the longitudinal strands extending in the direction of wrap and stretched as the netting is wrapped around the load to bind the load, said netting being wrapped around the load .Iaddend.with the longitudinal strands of the netting extending in the direction of wrap and, as the netting is wrapped around the load, stretching the longitudinal strands of the netting at least 25%, and securing the netting in place on the load with the longitudinal strands so stretched, thereby to maintain the load bound in place on the pallet, the netting allowing for ventilation of the 
     
     
        load. 26. The method of stabilizing a load on a pallet comprising wrapping plastic netting .[.as set forth in claim 24.]. around the load.Iadd., said netting being in the form of a continuous web having strands extending generally longitudinally of the web spaced at intervals transversely of the web and strands extending generally transversely of the web spaced at intervals longitudinally of the web, the netting being formed of a thermoplastic synthetic resin material, the longitudinal and transverse strands being integrally joined at the intersections thereof, the transverse strands being substantially thinner than the longitudinal strands, the longitudinal strands being elastic to the extent of being stretchable at least 25% while retaining a substantial degree of elasticity over a relatively long period of time after having been wrapped around a pallet load with the longitudinal strands extending in the direction of wrap and stretched as the netting is wrapped around the load to bind the load, said netting being wrapped around the load .Iaddend.with the longitudinal strands of the netting extending in the direction of wrap and, as the netting is wrapped around the load, stretching the longitudinal strands of the netting at least 25%, and securing the netting in place on the load with the longitudinal strands so stretched, thereby to maintain the load bound in place on the pallet, the netting allowing 
     
     
        for ventilation of the load. 27. A pallet load wrapped with plastic netting .[.as set forth in claim 1.]..Iadd., said netting being in the form of a continuous web having strands extending generally longitudinally of the web spaced at intervals transversely of the web and strands extending generally transversely of the web spaced at intervals longitudinally of the web, the netting being formed of a thermoplastic synthetic resin material, the longitudinal and transverse strands being integrally joined at the intersections thereof, the longitudinal strands being elastic to the extent of being stretchable at least 100% when stretched at the rate of 1000% per minute while retaining a substantial degree of elasticity over a relatively long period of time after having been wrapped around a pallet load with the longitudinal strands extending in the direction of wrap and stretched as the netting is wrapped around the load to bind the load, said netting being wrapped around the load .Iaddend.with the longitudinal strands of the netting extending in the direction of wrap and stretched at least 25%, thereby maintaining the load bound in place on the pallet while allowing for ventilation of the load. 
     
     
          . A pallet load wrapped with plastic netting .[.as set forth in claim 24.]..Iadd., said netting being in the form of a continuous web having strands extending generally longitudinally of the web spaced at intervals transversely of the web and strands extending generally transversely of the web spaced at intervals longitudinally of the web, the netting being formed of a thermoplastic synthetic resin material, the longitudinal and transverse strands being integrally joined at the intersections thereof, the transverse strands being substantially thinner than the longitudinal strands, the longitudinal strands being elastic to the extent of being stretchable at least 25% while retaining a substantial degree of elasticity over a relatively long period of time after having been wrapped around a pallet load with the longitudinal strands extending in the direction of wrap and stretched as the netting is wrapped around the load to bind the load, said netting being wrapped around the load .Iaddend.with the longitudinal strands of the netting extending in the direction of wrap and stretched at least 25%, thereby maintaining the load bound in place on 
     
     
        the pallet while allowing for ventilation of the load. .Iadd.29.  Plastic netting in the form of a continuous web having strands extending generally longitudinally of the web spaced at intervals transversely of the web and strands extending generally transversely of the web spaced at intervals longitudinally of the web, the netting being formed of a thermoplastic synthetic resin material comprising a blend consisting of a major proportion of polybutylene and a minor proportion of polypropylene, the longitudinal and transverse strands being integrally joined at the intersections thereof, the longitudinal strands being elastic to the extent of being stretchable at least 100% when stretched at the rate of 1000% per minute while retaining a substantial degree of elasticity over a relatively long period of time, being elastic to the extent of retaining at least 30% of the initial stress at 100% elongation, and having a tensile strain recovery of at least 30%. .Iaddend. .Iadd.30. Plastic netting as set forth in claim 29 wherein the synthetic resin material is a blend of about 90% polybutylene and 10% polypropylene by weight. .Iaddend. 
     
     
        .Iadd.31.  Plastic netting as set forth in claim 30 wherein the longitudinal strands are about 0.030-0.050 inch in diameter, the transverse strands are about 0.020-0.040 inch in diameter, the spacing of the longitudinal strands transversely of the web is in the range from about 1/4 inch to 10 inches, and the spacing of the transverse strands is in the same range. .Iaddend. .Iadd.32. Plastic netting as set forth in claim 31 wherein the longitudinal strands are spaced about 0.85 inch and the transverse strands are spaced about 1.75 inches. .Iaddend.