If it is not removed, the bedding will become easier to fall to the ground and get damp, the air circulation is impeded. It is very unhealthy.
The plastic film of a new mattress should be removed. It should be removed or it will impede the air circulation within our body and the mattress which leads the bedding get damp because of our sweat. It is really unhealthy. And the smoothness of it can make it easier for bedding to fall to the ground which means another potential safety problem. So it is an requirement to remove the plastic packaging film of a new mattress.
You can take followings as a reference. It should be removed or it will impede the air circulation of the mattress which can lead to mildew, bacteria and acarid. This problem can be settled when the film is removed. Then don't block the venthole of mattress. The mattress can not be cleaned by water. So it is better to use quilt cover that can be washed frequently to keep the mattress clean. The regular retroflexion of the mattress can increase its service life.
