Light transmissive foam compositions and methods

Polyolefin foams having improved light transmittance include the following properties: an average cell size from about 70 microns to about 500 microns; the ratio of the total cell wall thickness to the standard thickness is from about 0.15 to about 0.55; a basis weight of from about 0.00005 lb/in2 to about 0.00050 lb/in2; the L-color three-dimensional value is about 95 to about 45; and a light transmittance, measured according to JIS K 7361-1, of from about 10% to about 50%. A method for manufacturing a polyolefin foam having improved light transmittance includes: extruding a foamable sheet at an air pressure of about 1 psi to about 55 psi; and foaming the foamable sheet with a foaming agent having an average diameter of about 10 microns to about 25 microns, thereby producing a foam having a light transmittance of about 10% to about 50% as measured according to JIS K 7361-1. 具有改进的透光率的聚烯烃发泡体包括以下特性：平均泡孔尺寸为约70微米至约500微米；总泡孔壁厚度相对于标准厚度之比为约0.15至约0.55；基重为约0.00005lb/in2至约0.00050lb/in2；L色立体值为约95至约45；并且根据JIS K 7361-1测得的