Barrels

In an effort to better serve customers, PMT developed the Trimetal barrel 15 years ago. 

The advantages of this three-part barrel include:

• Shorter press downtime in the case of a repair
• Repair by simply replacing the inner liner
• Possibility of using various hardened steel grades for the inner liner, according to the processed plastics
• Inexpensive repair for the replacement of the inner liner

Manufacturing of new injection or extrusion barrels

Version: 

• According to manufacturer's model
• According to PMT design, studied by the design office

Steel grades used:

• Nitriding steels
• Hardened steel grades for some parts of the barrel (inner liners in the case of tri-metal barrel)
• Bi-metal

Treatments used:

• Gas or ion nitriding
• Vacuum hardening

Repair of injection or extrusion barrels

Reboring:

• The barrel is rebored to the maximum wear dimension and is nitrided again if necessary
• The diameters of the screw, valve and nose will be readjusted to match the new diameter of the barrel 

Partial lining: 

• The barrel is lined along the length of the maximum stroke of the valve.
• The liner is hardened to 56-58 HRC. 

Screwed front barrel:

• The barrel will be in two sections: a recovered rear part and a new front
• The front can be made from nitriding steel or consist of bi-metal. 

Reconditioning of the tri-metal barrel:

• The first reconditioning consists in transforming your worn barrel into a tri-metal barrel designed by PMT. The back of the barrel will be recovered, while the front and the hardened inner liner will be new
• The second reconditioning consists in replacing only the inner liner