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There are a number of machines on the market that can create various ASTM & ISO test specimens.
Why choose a Mini-Jector brand machine? Mini-Jector machines can create high-quality specimens
from a large variety of materials.
Mini-Jector machines are available in screw-type and plunger-type models to provide maximum flexibility
for test specimen applications.
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Model 45 and Model 50
plunger-type machines offer the following advantages:
- Run common plastics
- Injection pressure to 32,000 psi
- Rugged machines at low cost
Our plunger-style machines boast several control options that make the Mini-Jector a great value. These options are:
- Injection Pressures to 30,000 psi (note less than 15,000 psi on a plunger-style machine will limit even the common
materials that can be effectively molded)
- Injection speed and pressure control
- Two zones of heat control (barrel and nozzle)
- Spreader design to help even out heat temperature / flow characteristics
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Model 55 and Model 55E-1
screw-type machines offer the following advantages:
- Run all polymers
- Fast purge
- Duplicate results seen on much larger machines
- The only production, bench-top, "screw-type" machines on the market
- Hydraulic or servo electric
option
The quality of specimens produced and the variety of materials that can be tested really set the Mini-Jector bench-top molding machine apart from
its competition. The following materials must be run on a screw-type machine:
- Filled nylon
- Polycarbonates (Lean™)
- Thermoplastic polyesters (Valox™)
- LCP, liquid crystal polymer (Vector™)
- Fluorocarbons
- Ultem™
- PEEK™
- Materials processed at over 700° F
Also note that dry color formulas can be run with homogenous color dispersion on the Model 55 bench-top screw machine.
The screw-type machine allows parts to be molded at lower pressures, which reduces molded-in stresses on sample parts.
Typically, filling speeds can be more accurately controlled, which also minimizes stresses.
If the final product is being made on a machine with a screw, why would the tested parts be produced on a plunger-style machine?
To make a legitimate sample, the material from the previous test must be completely purged. We have a choice of screws, but the
typical lab machine would use either the standard screw (2.74 cubic inches of material) or the reduced-volume screw (1.37 cubic inches of material).
Once the screw is put in extrude mode, machine purging (with the help of the purge tool) is a very fast process. While only a slight
difference, by nature of its operation, a screw-type machine with its even heat will purge more quickly than a similar volume
plunger machine.
The key to purging our machines is the supplied purge tool.
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Purge Tool
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The Mini-Jector machines can make sample parts for the following tests:
- ASTM D256 and ISO 180
- ASTM D638 and ISO 527
- ASTM D412
- ASTM D543
- ASTM D570
- ASTM D635
- ASTM D648 and ISO 75
- ASTM D695 and ISO 604
- ASTM D696 and ISO 11359
- ASTM D732
- ASTM D785 and ISO 2039
- ASTM D790 and ISO 178
- ASTM D1003
- ASTM D1708
- ASTM D1822
- ASTM D2863
- ASTM D4812
- ASTM D4065, D4440 and D5279
- ASTM D5379
- ASTM D6290
- ISO 179
- ISO 3167
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