Lloyd Instruments has developed a test jig for evaluating both the force required to pull of the end caps from syringes and the force required to expel fluid through the syringe.
This jig enables two different tests to be performed and can accommodate both 125ml and 30ml syringes.
Originally designed for use with Lloyd's LRXplus single column (5kN (1124lbf)) materials testing instrument, the jig could also be used with the company's twin column testing machines.
The jig consists of a rectangular frame mounted on the baseplate of the materials testing machine.
The top plate of the jig has a centrally located hole and a pair of locking levers.
Syringes of both sizes can be attached vertically to the top plate using adapter plates, either pointing up, or down through the hole.
A pair of rails is positioned halfway between the top and bottom plate.
For end cap removal tests, each syringe is clamped vertically with the end cap pointing upwards.
The end cap is held in the upper grip of a TG74 adjustable rear face grip and the tensile force required to remove the plastic cap is measured.
The force required to expel fluid from the syringe is measured by clamping the syringe so that it passes down through the hole.
A removable bowl is used to receive the fluid expelled from the syringe.
For the larger syringe this bowl is positioned on the bottom plate of the jig.
For the smaller syringes it is positioned on the rails.
The compression piston is brought down to engage the top of the syringe plunger.
The end cap is removed and the force required to push out the fluid is measured.
