Nip rollers with removable disks

A nip roller comprising:

• a shaft;
• a first nip disk portion being a semi-annular disk;
• a second nip disk portion being a semi-annular disk;
• and
• an attachment section for removably securing the first nip disk portion and the second nip disk portion to the shaft, the attachment section including a first semi-annular attachment part configured to removably attach the first nip disk portion to the shaft and a second semi-annular attachment part configured to removably attach the second nip disk portion to the shaft,
• the first semi-annular attachment part including a first mandrel, a first keeper and at least one first fastener and the second semi-annular attachment part including a second mandrel, a second keeper and at least one second fastener;
• the at least one first fastener arranged and configured to force the first mandrel and the first keeper together so that first mandrel and first keeper grip the first nip disk portion;
• and
• the at least one second fastener arranged and configured to force the second mandrel and the second keeper together so that second mandrel and second keeper grip the second nip disk portion.