1. Separate tool from machine nozzle or end of extruder.
2. While still at processing temperature, providing temperature is between 374º and 572º F, follow the last of the outgoing material with Pekutherm®, continuing to add small amounts of Pekutherm® until it exits clean or white from the machine nozzle or end of machine.
3. Continue to attempt to expel last amounts of Pekutherm® until no more material can be expelled. The Pekutherm® has now pre-scrubbed the screw and barrel and removed the material from the matrix (space) in between. The screw should now come out easily.
4. Follow all manufacturer’s instructions to remove the screw from the barrel. (Again, this should be easy since there is nothing holding it back.)
5. Remaining Pekutherm® can be peeled off of the screw. Dispose of the residue safely by quenching in water and/or putting in appropriate waste container.
6. Hand clean remaining tough spots. Measure and check screw for wear and defects.
7. Reassemble machine and return to normal molding.

PDF Download of these directions: Screw-Pull Aid Directions

Other files you might be interested in:  Downloads

Follow these extra steps when purging from materials and colors into optical and/or translucent clear polymers.

1. After the second plug of Pekutherm® has been run through your machine, add some damp incoming clear material. Turn up the screw speed to about 60% and run out the wet material. This will steam out the very small carbon specks.

2. When all the carbon is gone, set the limit switch all the way back and fill the whole barrel completely, then index the screw several times to knock any crumbs of Pekutherm® out of the check ring.

3. Repeat Steps 1 & 2 if there is any sign of carbon left in the incoming clear material.

FOR PREVENTIVE MAINTENANCE

1. Determine when the production material first begins to degrade or generate carbon specks. For instance, after a thorough purge you begin to run production. If for several days later specks appear, you could conclude that degraded conditions now exist.

2. Pekutherm® should be used just prior to the degrade or carbon speck occurrence.

3. In most situations, a ½ barrel flush with Pekutherm® two to three times a week should inhibit carbon build-up. Some molders only need to purge once a week, while others purge once daily. The frequency has a lot to do with how sensitive your production material is.

4. Purging can be done by breaking into the production run or at some other down time. The host production material can be used to follow out the Pekutherm® and production can resume right away.

5. As always, refer to the Pekutherm® Purging directions while purging. Many shops have greatly reduced production fall out by using this method. Also, tool, color and material changes will be faster because there will be little to no build-up of laminated material in the compression zone of the screw.

Internationally Proven

Physical Purging Compound for the Thermoplastic Industry

PEKUTHERM® OFFERS:

• EFFECTIVE MATERIAL CHANGES
• FAST COLOR CHANGES
• REMOVAL OF CARBON BUILDUP
• ELIMINATION OF GAS RESIDUES
• NO MIXING, NO CHEMICAL REACTIONS
• DOES NOT WEAR ON THE SCREW OR BARREL

ADVANTAGES

• PURGES THROUGH PHYSICAL ACTION
• EXPELS UNWANTED PLASTIC, HARDENED POLYMERS AND THEIR ADDITIVES, CARBON FLECKS AND GAS RESIDUES
• DRASTICALLY REDUCES PURGING TIME AND QUANTITY NEEDED TO FULLY PURGE

DIFFERENT FORMULATIONS TO SUIT YOUR PURGING NEEDS

FOR WORKING TEMPERATURES OF 375° TO 572° F

• PEKUTHERM® “N” – FOR MEDIUM TO LARGE MACHINES, GREATER THAN 150 TONS
• PEKUTHERM® “SM” FOR 80 TO 150 TONS
• PEKTHERM® “SK” FOR SMALLER THAN 80 TONS

SPECIALTY PRODUCTS

• PEKUTHERM® “HLT” OR “HLT SPECIAL FOR WORKING TEMPERATURES OF 302° TO 752° F
• PEKUTHERM® “EX” FOR EXTRUDERS
• PEKUTHERM® “TI 2” FOR PURGING HOT RUNNERS