Methods of producing polyolefin foam sheets and articles made thereof

A physically crosslinked polyolefin foam sheet comprising at least one polyolefin resin selected from the group consisting of a polypropylene and a polyethylene,

• wherein a surface of the physically crosslinked foam sheet is skived to obtain a skived primary surface and the skived primary surface of the foam sheet has a Sa of about 20 to about 150 μm and an Sz of about 250 to about 1000 μm,
• the foam sheet has an unskived surface and a surface roughness of the skived primary surface of the foam sheet is greater than the surface roughness of the unskived surface,
• the unskived surface has an Sa of about 5 to about 30 μm and an Sz of about 90 to about 350 μm, and
• Sa is defined by the following expression:
• Sa
• =
• 1
• A
• ⁢
• ∫
• ∫
• A
• ❘
• "\[LeftBracketingBar]"
• z
• ⁡
• (
• x
• ,
• y
• )
• ❘
• "\[RightBracketingBar]"
• ⁢
• dxdy
• .