A4200 Flexible Sealing Element
HASCO’s new A 4200 sealing
element (MurSeal ® technology)
is the only plastic sealing element
available on the market for injection
moulds.
It can be used for plastic injection
moulding around metal inserts without
flash or damage.
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Special Features
- Prevents flash formation on plastic injection-moulded metal inserts.
- Reduces unit costs.
- Minimisation of rework on the moulded part.
- Optimises quality of article.
- Reduces scrap significantly.
Area of Application
Plastic encapsulation of metal inserts
by means of injection moulding is
currently the state of the art.
It combines high performance in terms
of use and assembly with excellent
surface quality.
Composite material structures are used
wherever metal components have to
meet extreme requirements, for example
in respect of insulation, heat protection
or corrosion protection, noise
and vibration damping.
Plastics currently provide the most
cost-effective method of fusing metal
and plastics. Suitable in particular for
metal inserts with sensitive surfaces
(e.g. paint-finished, electro-plated), the
A 4200 avoids surface damage
such as abrasions or dents.
Flash formation, which is common on
stampings with large fractured surfaces
and stamping indents, can be avoided
by using flexible sealing elements.
A4200 – New quality in
hybrid technology
Sufficient surface pressure and flexible
sealing surfaces on the injection mould
are essential for accurate injection
moulding encapsulation. This is often
achieved using complex slide mechanisms
or spring bearings on sealing
surfaces. As these are made from
steel, they are therefore not suitable
for the as-delivered condition of every
metal insert, meaning that the possibility
of flash formation or damage cannot
be ruled out.
The previous state of the art could not
guarantee encapsulation of metal
inserts without flash or squeeze marks
during injection moulding.
The HASCO A4200 sealing
element provides the solution!
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Versus |  |
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A4200 "holds tight"
Where existing technology had reached
its limits, the A 4200 is now achieving
what was previously considered
impossible:
Encapsulation of inserts with no risk
of damage and flash. Injection moulds
fitted with the A 4200/. . . work reliably
and economically, thereby significantly
reducing costs.
The A 4200 is fitted in the injection
mould around the areas of the insert
which need to be sealed.
The A 4200 is the first plastic
sealing element which, following
machining, not only replaces but
far outperforms the conventional
steel seals.
A4200/... proven in practice!
The A 4200/. . . has already been used
successfully in many injection moulds,
in particular in the automotive sector.
The A 4200/. . . sealing elements are
suitable for the moulding of reinforced
and non-reinforced plastics, e.g. PBT
30 %GF, PA 30 %GF,
PPS 40 %GF and TPE.
The A 4200/. . . is particularly suitable
for use with sheet thicknesses at and
above approx. 4 mm. It has even been
used successfully for the injection of
metal inserts 25 mm in diameter and
approx. 5 kg in weight.
Tolerances can also be compensated
with A 4200 /. . . .
-
Possible tolerance compensation
(irrespective of thickness)
- With square inserts : 0,1 mm per side to the cutting level 0,1 - 0,15mm overall crosswise
- With round inserts : approx. 0,2 mm diameter
Quantities confirmed so far without visible evidence of wear on the sealing element are in the region of 80,000 cycles. The elements are fitted in the same way as mould inserts. Machining the flexible A 4200/. . . sealing elements couldn’t be easier. Please contact HASCO Application Technology for more information.
Practical example:
Product: Compensating system of rods
Surface: Powder-coated
Diameter: 25 mm
Encapsulation: Partial with PA6 GF30
Problem: Damage to powder coating during
closing of mould and flash.
Manual deburring and refinishing.
| Labour costs without A 4200 | Labour costs using the A 4200 |
|---|---|
| (EUR 13.04/hour) | (EUR 13.04/hour) |
| Production step 1: -Insertion and removal |
Steel sealing elements in the injection mould replaced by the A 4200 |
| Production step 2: -Deburring of produced parts |
Result: No damage to paint finish and overinjection of stabilizers. |
| Production step 3: -Refinishing of damaged surfaces |
Production step 1: Insertion and removal |
| Costs per unit: EUR 0.15 Costs per 10,000 units: EUR 1495.00 |
Costs per unit: EUR 0.05 Costs per 10,000 units: EUR 498.00 |
Approximately one-third
of the cost with the A4200! |
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