Paper material for fibrous casing, production method thereof, and fibrous casing

A paper material for fibrous casing to be used as a food packaging material in heat processing of a foodstuff, wherein:

• the paper material is formed by papermaking using a pulp slurry;
• a content of pulp in the paper material is no less than 50% by mass;
• one face is a gloss face and another face is a matte face;
• and
• the paper material is used as an innermost layer of the fibrous casing to be in contact with the foodstuff;
• and
• wherein an arithmetic average roughness Ra of the gloss face is no less than 0.5 μm and no greater than 3 μm, and an arithmetic average roughness Ra of the matte face is no less than 3 μm and no greater than 6 μm.

A paper material for fibrous casing to be used as a food packaging material in heat processing of a foodstuff, wherein:

• the paper material is formed by papermaking using a pulp slurry;
• a content of pulp in the paper material is no less than 50% by mass;
• one face is a gloss face and another face is a matte face;
• and
• the paper material is used as an innermost layer of the fibrous casing to be in contact with the foodstuff;
• and
• an absolute value of a fiber orientation angle of the gloss face is no less than 0° and no greater than 3°;
• and
• an absolute value of a fiber orientation angle of the matte face is no less than 0.5° and no greater than 4°,
• the absolute value of the fiber orientation angle of the gloss face being smaller than the absolute value of the fiber orientation angle of the matte face.