Extruder Accessories

Blank Melt Bolts

These are used to close or block existing melt temperature or pressure vents, where pressure transducers or temperature thermocouples are no longer being used. Available in 316 stainless in various lengths these blank bolts are rated for pressures in excess of 15,000 PSI.

Rupture Disc

Pressure sensitive discs are used as over pressure protectors, when normal running pressures are exceeded. These are made of stailess steel and fit most extruders that have melt pressure or melt thermocouple vents on the barrel. Rupture discs are a safety device that release pressure, should they exceed the pressure that they are manufactured to collapse at. Typical burst pressures are 4000, 4500, 5000, 6500, 7500, and 9500. Normal stem lengths are, 3" and 6" with 1/2- 20 UNF threads and a hex bolt for installation and removal.

Melt Temperature Thermocouple

These are temperaure sensors that are used in extruders where plastic melt temperatures need to be measured. They are ruggedly manufactured in 316 Stainless steel with fglexible armour construction along with a high temperature plug. Various tip and body sizes ensure direct replacement of pre-existing temperature probes. Standard sizes are 6" stem length with 12" of flex armour. Longer lengths of bolt sizes and leads are also available. Noemal thread size is a 1/2-20 UNF in a type J or K Thermocouple calibration.

Melt Pressure Indicator Controller

Are highly accurate devices, that ensure a very high degree of stability and repeatability when measuring Extruder Melt Pressure. These units are available in a variety of ranges from 0 to 20,000 PSI and have overload pressure capabilities of twice the rated pressure range. They are high temperature devices that withstand 750ºF (400ºC) and are available with built in thermocouples, or with 18" of flex armour cables. Melt pressure transducers are also available in EXPLOSION PROOF construction to meet CLASS I, DIVISION I, Group B, C, and D. Made of Stainless Steel they have an industrial standard 1/2 - 20 UNF thread alongwith a hex nut that facilitates installation and removal. Pressure transducers work on strain guage principles and have the following.

Specifications

Accuracy. . . . . . . . . . . . . . . . . +/- 0.5 % or 1 % of full scale
Repeatability. . . . . . . . . . . . . . .+/- 0.1 % of full scale
Sensitivity. . . . . . . . . . . . . . . .3.33 millivolt/volt
Excitation. . . . . . . . . . . . . . . . 6 to 10 volts DC
Diaphragm Material. . . . . . . . . . . . 5-5PH Stainless Other materials available