PRESSBLOWER Injection Blow Moulders - OSSBERGER

PRESSBLOWER
Injection Blow Moulders

Pressblower DSE 80
Pressblower DSE 150
Pressblower DSE 260

Tasks

Worldwide the Pressblower Injection
Blow Moulding technique of Ossberger
is renowned and well-established for
the production of automotive compon-
ents. Today this involves mainly

· constant velocity joint boots for the
drive shaft

· bellows for the steering system
· dust bellows
· covers for shock absorbers

shock absorber applications steering bellows

More and more the trend to reduce raw
material use is getting obvious; conse-
quently the plastics products are to be
designed as compact as any possible.
At the same time environmental aspects
are playing a growing role why the use
of recyclable plastics grades turns out
to be a crucial target.

The Pressblower models DSE 80,
DSE 150 and DSE 260 are meeting
these trends to full extent. In particu-
lar this counts for two products of the
automotive industry which show great
growth potential:

· jounce bumpers for suspension struts
(also called bump stops)

· compact CV joint boots

jounce bumpers compact boots

Solutions

Compact CV Joint Boots:

At first glance it seems that the com-
pact CV joint boots for drive shafts
which will increasingly be used in the
future are just the smaller version of
those which are already common in
the market. But let’s look behind the
curtain: The compact boots demand
more and more outstanding qual­
ity with respect to production and
process features since the definition
of the parison which will be blow
moulded requires substantial control
on a significantly higher level; at the
same time more stringent tolerances
have to be respected.

production station

Jounce Bumpers: Furthermore the design of the novel The quality requirement towards the
jounce bumpers now to be manu­ manufacturing process to make a
Jounce bumpers (which are also factured of a thermoplastic copolyester jounce bumper is huge. In particu-
called bump stops) are used in every elastomer offers the chance to reduce lar this applies to the wall thickness
shock absorber of an automobile to not only the total weight of the assem- distribution within the convolutes of the
increase the driving comfort con- bly system but also the number of product and the tolerances to be kept.
siderably. To date they are produ- components and – as a logic conse- With the new Pressblower generation a
ced either of a microcellular PU quence – its total price. This is due to solution for these challenges is offered
elastomer or of rubber. But these the fact that now a combined product – like it is for compact boots.
traditional materials imply two dis- will be manufactured which includes
advantages: Firstly: They cannot be the jounce bumper itself as well as the
recycled. And secondly: The product dust bellows.
weights are already optimized.

The PRESSBLOWER Process

- At the beginning of the cycle the 1st step: injection mould meets 2nd step: Drawing of parison
injection mould with the recessed nozzle parts for injection with closed loop speed
shape of the head section moves moulding of head section and nozzle gap control
downwards onto the ring nozzle
closing it tightly. So a cavity is
obtained which in the first working
step is filled with a defined quantity
of melt. This way the small end
diameter, e.g. of a CV joint boot, is
precisely injection moulded.

- In the second step the injection
mould moves upwards; at the same
time a defined quantity of material
is extruded from the ring nozzle
following the drawing speed of the
injection mould. Retained in the
injection mould at the one end and
in the nozzle at the other a tubular
parison with an exact wall thickness
distribution is formed.

- After the drawing step the blow
mould closes around the parison
for blow moulding it in the third
working step.

- In the fourth phase the blow
mould and the injection mould
open to release the part to a grip-
per for its transport to the bottom
cutting device to trim it to its final
length (optionally a top cutting
device can be used what might be
necessary in some cases, e.g. for
air spring bellows).

3rd step: Blowing of parison 4th step: Cutting to dimension
and final design

PRESSBLOWER models
DSE 80, DSE 150 und DSE 260

Example of a stroke profile setting of The new Pressblower generation repre- These future products can be manu-
the nozzle cone sents the consequent follow-up of its factured reliably on the new machine
predecessors. Specifically it is targeting generation bearing in mind that it
Overview page with direct access various future products: offers a number of new advantages:
to monitor pages
- In the future CV joint boots for the - The size of the accumulator head is
driveline will be designed in a more laid out for the product size concer-
compact, lighter and more space- ned.
saving way. At the same time the
quality requirements increase, espe- - The drawing unit represents an elec-
cially regarding the wall thickness trically driven axis.
tolerances.
- The gripper unit will be driven electri-
- As before the range of products cally in horizontal as well as in vertical
allows the manufacture of steering direction.
bellows.
- A top cutting device can be actuated.
- Jounce bumpers for shock absorbers In this case the trimming of both ends
will be made of thermoplastic copo- takes place simultaneously what can
lyester elastomers in the future. The lead to a cycle time reduction.
product quality requirements can only
be achieved if a high-precision blow - To keep mould expenses low it is
moulding process is applied – i.e. the ensured that existing injection moulds,
Pressblower Injection Blow Moulding blow moulds and cutter parts can be
process of Ossberger. used on the new machine generation.

- The control cabinet is mounted to
the machine frame so the unit is more
compact and space-saving.

- The operating panel is mounted to a
jib-arm in a comfortable position.

view to the control
cabinet side

OSSBERGER GmbH + Co Plastics Technology

Company Address: Otto-Rieder-Str. 7
D - 91781 Weissenburg/Bavaria
Mailing Address:
P. O. Box 4 25
Phone: D - 91773 Weissenburg/Bavaria
Fax: Germany

e-mail: ++ 49 91 41 / 9 77- 0
Internet: ++ 49 91 41 / 9 77- 20
[email protected]
www.ossberger.de

Reserve to changes