Retrofit Clamshell Barrel for Twin Screw Extruders

05 Feb 2015

The Xtrutech retrofit clamshell barrel has been designed to replace older worn out barrels and includes a range of high wear resistant liner materials that will give the extruder user improved performance, productivity and profits. Here are some of the benefits of investing in an Xtrutech extuder featuring a clamshell barrel as standard

The clamshell barrel with low-cost insert liners has become more widely used by companies who manufacture not only Powder Coating or Thermoplastics but also Food applications such as snack foods and pet food that are very abrasive and / or corrosive. Xtrutech are now promoting the system for all makes of co-rotating twin-screw extruders. The new system can be easily adapted to existing machinery, giving it a new lease of life for only a fraction of the cost of totally replacing the machine. It offers major savings to high wear processes and is itself a more robust and maintenance free solution than the original suppliers barrel design. Users in the powder coatings, thermoplastics and food industries can now take advantage of this superior barrel.


XTS 44


Improved performance

The new barrel has been designed with single-piece backing blocks that eliminate cracked barrel parts that are common on older APV / Baker Perkins extruders. Fewer clamping bolts save barrel opening times and offer quick access to the screws when cleaning or during maintenance. The backing blocks carry insert type liners that are much smaller in size than the original OEM liners this means Xtrutech are able to use harder wearing or more corrosive resistant premium materials that maximise performance against cost.

Low maintenance

On the XTS range of Powder Coating extruders, Xtrutech have incorporated the stuffing box into the barrel so it opens with the top barrel half to expose the shafts and makes their removal that much easier and simpler. The traditional gland packing and followers have been replaced with oil impregnated split bushes that prevent fine powders from the feed material creating a mess in the shaft coupling area and eliminate the need for maintenance.

The design incorporates new highly efficient cooling channels and a specially designed feed port coupled with new high intake feed screws to help improve the intake of previously difficult to feed bulky powders making the new barrel more efficient and improves performance in terms of output.


                                      Clamshell Barrel Open

Versatile design

The barrel can be extended up to 42 L/D for acrylic formulations or 18, 24 or 28D for epoxy, polyurethane or polyester formulations to give more mixing time and / or potential higher outputs. It will fit almost any APV, Baker Perkins or B&P powder coating extruders from 40mm up to 125mm. The “half” clamshell design will fit an older W&P or OMC with a fixed / solid barrel style barrel where a customer can take advantage of the clamshell style barrel.  We use a range of high wear resistant materials from through hardened D2 or K110 to M333 & M390 for Food applications to very high wear resistant Vanadium PM steels plus other more special powder metallurgy HIP’d materials.

Ongoing savings

Any future liner changes would incorporate the insert style liners that are approximately 50% lower cost to replace than the original OEM style liners. It is important to stress that the customer can easily fit replacement insert liners in a very short time as there is no more optical alignment necessary. All the improvements from the Xtrutech cost effective retrofit barrel really does offer the customer improved performance, productivity and profits.


                                       Solutions to Worn Extruders 2