초록 ▼

A geocell is disclosed that has high strength and stiffness, such that the geocell has a storage modulus of 500 MPa or greater at 23° C.; a storage modulus of 150 MPa or greater at 63° C. when measured in the machine direction using Dynamic Mechanical Analysis (DMA) at a frequency of 1 Hz; a tensile

A geocell is disclosed that has high strength and stiffness, such that the geocell has a storage modulus of 500 MPa or greater at 23° C.; a storage modulus of 150 MPa or greater at 63° C. when measured in the machine direction using Dynamic Mechanical Analysis (DMA) at a frequency of 1 Hz; a tensile stress at 12% strain of 14.5 MPa or greater at 23° C.; a coefficient of thermal expansion of 120×10−6/° C. or less at 25° C.; and/or a long term design stress of 2.6 MPa or greater. The geocell is suitable for load support applications, especially for reinforcing base courses and/or subbases of roads, pavement, storage areas, and railways.

대표청구항 ▼

1. A method of forming a polymeric sheet or strip having a storage modulus of 500 MPa or greater when measured in the machine direction by Dynamic Mechanical Analysis (DMA) according to ASTM D4065 at 23° C. and at a frequency of 1 Hz, the method comprising: extruding an intermediate sheet made from

1. A method of forming a polymeric sheet or strip having a storage modulus of 500 MPa or greater when measured in the machine direction by Dynamic Mechanical Analysis (DMA) according to ASTM D4065 at 23° C. and at a frequency of 1 Hz, the method comprising: extruding an intermediate sheet made from a polymeric resin;stretching the intermediate sheet to obtain the polymeric sheet having the storage modulus of 500 MPa or greater; andoptionally cutting the polymeric sheet into strips to obtain the polymeric strip having the storage modulus of 500 MPa or greater. 2. The method of claim 1, wherein the intermediate sheet is stretched at a temperature of from about 25° C. to about 10° C. below a peak melting temperature of the polymeric resin. 3. The method of claim 1, wherein the intermediate sheet increases in length from 2% to 500% during the stretching. 4. The method of claim 1, further comprising annealing the polymeric sheet after stretching. 5. The method of claim 4, wherein the annealing occurs at a temperature of from about 2° C. to about 60° C. below the peak melting temperature of the polymeric resin. 6. The method of claim 4, wherein the stretching and the annealing occur at a temperature of from about 24° C. to about 150° C. 7. The method of claim 1, wherein the stretching occurs at a temperature of from about 100° C. to about 125° C. 8. The method of claim 1, wherein a thickness of the intermediate sheet is reduced by 10% to 20% due to the stretching. 9. The method of claim 1, wherein the polymeric resin is a blend of (i) a high performance polymer and (ii) a polyethylene or polypropylene polymer. 10. The method of claim 1, wherein the intermediate sheet has an outer layer and a core layer. 11. The method of claim 10, wherein the outer layer is made from a polymer selected from the group consisting of high density polyethylene, medium density polyethylene, low density polyethylene, polypropylene, blends thereof, and alloys thereof. 12. The method of claim 10, wherein the outer layer is made from an alloy of (i) high density polyethylene, medium density polyethylene, low density polyethylene, or polypropylene with (ii) a polyamide or polyester. 13. The method of claim 10, wherein the core layer is made from an alloy of (i) a polyethylene or a polypropylene with (ii) a polyamide or polyester. 14. The method of claim 1, further comprising embossing the intermediate sheet. 15. The method of claim 1, further comprising irradiating the intermediate sheet to induce crosslinking. 16. A method of forming a polymeric sheet or strip having a storage modulus of 150 MPa or greater when measured in the machine direction by Dynamic Mechanical Analysis (DMA) according to ASTM D4065 at 63° C. and at a frequency of 1 Hz, the method comprising: extruding an intermediate sheet made from a polymeric resin;stretching the intermediate sheet to obtain the polymeric sheet having the storage modulus of 150 MPa or greater; andoptionally cutting the polymeric sheet into strips to obtain the polymeric strip having the storage modulus of 150 MPa or greater. 17. A method of forming a polymeric sheet or strip having a long term design stress of 2.6 MPa or greater when measured according to the PRS SIM procedure, the method comprising: extruding an intermediate sheet made from a polymeric resin;stretching the intermediate sheet to obtain the polymeric sheet having the storage modulus of 150 MPa or greater; andoptionally cutting the polymeric sheet into strips to obtain the polymeric strip having the storage modulus of 150 MPa or greater.