Injection System USV - LWB Steinl GmbH & Co. KG

More flexibility, better cost management
with USV injection technology
We achieved a state of the art increasing the productivity of rubber
vulcanisation. There is no doubt that a higher compound temperature in
the cavity leads to shorter cure time and subsequently to higher output.
In the beginning, the USV technology was developped for middle
sized and large-volume rubber and rubber/metal parts. Now this
injection technology is also available for multi-cavity moulds.
Unique heating of the compound
- Up to 75 % cure time reduction in comparison to traditional injection presses
- Very smooth heating of compound during the cycle due to thermal conduction
(no destruction of the polymer chain)
- Homogeneous compound temperature in the cross section
Quality improvement
- single cavity production with middle and large-volume parts
- no shearing of the compound
- no residual rubber in the injection unit during the injection cycle
Less rejects
- constant production conditions
- constant production due to robot application
- faults that occur with multi cavities, are nearly avoided
Cost reduction
- use of prototype moulds for the production
- less cavities due to shorter curing cycles for batch production
- mould change very easy to handle (flexibility)
- operation possible in manual as well as in automated mode
- highly flexible production
- easy and quick restart of production in case of mould change
Rubber
VCUSV 500/300 Operating area
protected by a light curtain
TPE
Fully automated 2K manufacturing cell with
USV and robotics technique
Production planning
A new production run does not need high costs in the beginning, but can be
increased step by step. The first press with prototype mould is applicable for pre-series
production as well as for batch production without another acceptance procedure.
To increase production capacity, further machine-units with simple 1-cavity moulds
can be planned. Every mould, which is planned for future batch production, can
unobstructed be used from the beginning. The small machine units can easily be used
for other product production when demand decreases. Therefore production is very
flexible.
Particularities of the patended
USV injection technology
1. Compound is plastified in a „First in First
out“ injection unit and the set volume is
charged.
2. Via the „First in First out“ injection unit the
compound is charged into the ring piston
injection unit and remains there during
curing cycle for a dispersive heating.
3.Heating of the compound is effected
time controlled in the ring piston. Thus preheated,
the compound is injected into the
mould.
4. A higher start temperature shortens
curing time and therefore considerably the
whole cycle time
Cure time reduction is defined by the
setpoint of temperature and duration of
the pre-heating inside the ring-cylinder.
This extremely smooth kind of heating can, Charging the injection unit during pre-heating
especially with dynamically stressed parts,
lead to a longer life-time. The duration of
the injection cycle will be determinated by
the prospective cure time reduction. USV This fact USV
USV
Baugröße
does not cause any problems, 250as thick-walled 320
500
Spritzvolumen parts with cm³ larger volume automatically 250 have 320 500
Spritzdruck longer bar heating periods and 1120 subsequently 880 880
Spritzhub longer mm pre-heating periods. 280 282 390
Ø Ringkolben mm 62 x 52 62 x 49 62 x 47
With a testing phase over several years already
this technique is leading to small, highly
efficient production cells.
Ø Schnecke mm 25 32 32
Charging
Inject
USV INJECTION TECHNOLOGY