Product Details
The TABER® V-5 Stiffness
Tester - Model 150-B or 150-E is used to evaluate stiffness and
resiliency properties of materials up to 10,000 Taber Stiffness
Units. This precision instrument provides accurate test
measurement to ±1.0% for specimens 0.004" to 0.219" thickness.
Materials include paper products, cardboard, plastics, metals,
textiles, rubber, wire, tubing, felts and other sheet
materials.
Description
Incorporated in the TABER V-5 Stiffness Tester is a
bi-directional pendulum weighing system. Providing an accurate
and responsive method for measuring small load increments, this
system is a critical component for determining material stiffness
or resiliency. Nine (9) distinct ranges permit testing of
materials that are extremely lightweight and flexible (such as
cellophane or thin metallic foils) to items that are very rigid
(such as plastics).
For test ranges 2 - 9, specimens are mounted on the Taber V-5
Stiffness Tester using a clamping system. Located on the
pendulum, the lower faces of the specimen clamp jaws are exactly
on the center of rotation. This ensures a constant test length
and deflection angle for accurate and repeatable results. Both
jaws of the specimen clamp are adjustable, so the test specimen
can be positioned precisely in the center regardless of material
thickness. Force is applied to the lower end of the specimen by a
pair of rollers. The rollers, which are attached to a driving
disc located directly behind the pendulum, push against the test
specimen and deflect it from its vertical position. The pendulum
applies increasing torque to the specimen as it deflects further
from its original position. The test point reading occurs when
the pendulum mark aligns with the appropriate driving disc mark
(7 1/2° or 15°), which points to the stiffness reading on the
dial point. The final reading will depend on the range in which
the test is being conducted and what scaling factor to use. The
instrument outputs the moment load applied to the test specimen
in TABER Stiffness Units (g · cm).
Note: The right hand roller includes a ratchet stop mechanism
that greatly reduces the potential for inter-operator error
caused by over or under-tightening. The travel on the right hand
assembly automatically stops when the roller contacts the
specimen.
To allow the testing of materials with different stiffness
properties, range weights can be applied to the pendulum. For
extremely light weight materials, a compensator range weight is
mounted to the top of the pendulum. Range weights of 500, 1000
and 2000 "Taber Units" are mounted to the bottom of the pendulum
and required for stiffer materials. An optional range weight set
of 3000 and 5000 Taber units is required for test ranges 7, 8 and
9.
Range 1 is used with Taber's optional Sensitivity Range
Attachment (also referred to as SR or High Sensitivity
Attachment) to test extremely lightweight and flexible materials
whose Taber Stiffness Unit value are between 0 - 1. Examples
include cellophane, natural fibres and synthetic filaments,
tissue paper, metallic foils, films, etc. The attachment includes
two parts, the Driven Pins Holder which is secured between the
clamp jaws, and the Driving Pins Holder which is mounted to the
studs in place of the left and right hand rollers. Both parts
include precision pins that are oriented horizontal to the face
of the V-5 Stiffness Tester. A specimen 1 1/2" x 1 1/2" is
mounted such that the second and fourth pins are above the
specimen. As the driving disc rotates, the fourth pin of the
Driving Pins Holder pushes down on the specimen while the first
pin pushes up. As the sample is deflected, the Driven Pins Holder
aligns the pendulum to the appropriate stiffness value. For Range
1, the specimen is only deflected to the right.
Many customers have also utilized the Taber V-5 Stiffness Tester
to evaluate wire and cable stiffness characteristics. The tester
now incorporates a "v-notch" in the clamps to accommodate this
testing. Suggested samples are 70mm long and 3mm - 8mm in
diameter, and centered in the notch with care so as to not pinch
or crimp the sample. For wire and cable samples less than 3mm
diameter, it is recommended to secure the sample at a location in
the flat region of the clamp. Samples with curvature may
interfere with proper set-up and function of the Stiffness tester
and should be avoided. In addition, test results obtained should
be used for comparison only - that is, between lots, between
materials, etc.