Title of Invention

NEEDLE VALVE NOZZLE FOR AN INJECTION MOULD

Abstract The invention relates to a needle valve nozzle (10) for an injection mould, comprising a nozzle body (20) that contains at least one melt channel (30), the latter terminating against or in a nozzle mouthpiece (40) and having a fluidic connection to a mould cavity of the injection mould that is formed by at least one mould insert (50). A shut-off needle (60) penetrates the melt channel (30) and the nozzle mouthpiece (40) and can be displaced longitudinally through said parts, moving from an open position into a closed position. At least one infeed cone (46) is provided upstream of a seal seat (D), in order to centre the shut-off needle (60), the lower end of which forms a shut-off part (70). The aim of the invention is to guarantee a constantly precise guidance and sealing of the needle, whilst at the same time preventing an impairment of the temperature distribution in the vicinity of the nozzle tip. To achieve this, the nozzle mouthpiece (40) consists of a material with high thermal conductivity, whilst the or each infeed cone (46) for the shut-off needle (60) is configured in a centring body (80) consisting of wear-resistant material and running concentrically with the longitudinal axis (L) of the needle valve nozzle (10). The centring body is held against and/or in the nozzle mouthpiece (40) in a positive-fit and its end section (84), which forms an outlet opening (44) for
Full Text Needle valve nozzle
The invention relates to a needle valve nozzle for an injection mould according
to the preamble of claim 1.
Needle valve nozzles are used in injection moulds for supplying a flowable melt
at a pre-determinable temperature at high pressure to a separable mould block
(mould insert). The shut-off needles, in general pneumatically or hydraulically
actuated, are designed to periodically open and close outlet openings for the
melt, for example when a plastic material is to be injected in a segmental
manner (cascade moulding).
Each shut-off needle is arranged in the mould-side area of the needle valve
nozzle in an axially displaceable manner, and in the nozzle-side area centricaily
-unning through a melt channel (see DE 32 49 486 C3 or DE 34 03 603 A1, for
example). Typically, the melt channel terminates in a nozzle mouth piece which
"orms on its end the outlet opening for the melt. In closed position, the lower
3nd of the shut-off needle which has a generally cylindrical section engages
nto a likewise cylindrical sealing seat which is formed in the nozzle mouthpiece
)r in the mould insert.
n order to be able to maintain the melt at a constant temperature on its way
hrough the tempered melt channel to the mould insert, the nozzle mouthpiece
ypically consists of a highly thermally conductive material. It is directly screwed
nto the nozzle body of the needle valve nozzle from the bottom side or, as
jrovided in DE 197 17 381 A1, firmly secured by means of an outer screw
;ocket made from a material of low thermal conductivity. The outer end of the
.crew socket engages into a corresponding cylindrical seat in the mould insert,
1US centring the outlet opening with respect to the sealing seat. A narrow air
(lap formed between the highly thermally conductive nozzle mouthpiece and the
f lould insert provides the required thermal separation between the needle valve
I ozzle and the mould.
Due to the effects of extremely high pressures, for example far greater than
1,000 bar, a precise sealing in the closed position as well as an accurate
needle guidance are essential. To this end, the nozzle mouthpiece is provided,
above the outlet opening, with an infeed cone for the shut-off needle to allow
the latter to centrically enter the sealing seat during closing. However, this
oresents the problem that the shut-off needles use to strike with their sealing
adges the infeed cone in the nozzle mouthpiece. As a result, damages and in
"he long run leakages may occur. Precise sealing requires compliance with
strict tolerance limits, in particular in the case of long nozzles and deep bores,
and thus entails increased costs for manufacture and repair.
To avoid these drawbacks, the document DE 32 45 571 C2 provides a shut-off
leedle with a stepped lower end, such that a striking edge of increased
Jiameter is formed ahead of the actual shut-off part of the needle. The axial
ength of the preferably cylindrical shut-off part, i. e. the axial distance between
he front sealing edge of the shut-off part and the striking edge, is selected so
3s to provide an angle formed by a connection line from the sealing edge to the
striking edge extending through connection points distributed on parallel
iiameters, which is greater than the cone angle of the feed hopper in the
lozzle mouthpiece, in each case relative to the longitudinal axis of the melt
channel. Thus the nozzle mouthpiece serves as a pre-centring body for the
:hut-off needle. In fact, whenever the shut-off needle is deflected from its
;entral position during the closing procedure, only the striking edge will contact
he infeed cone, whereas the sensitive sealing edge of the shut-off needle is
ntroduced in a contactless manner into the nozzle mouthpiece.
"o improve service life, DE 32 45 571 C2 further proposes a nozzle mouthpiece
nade from a wear-resistant material. Such materials, however, are poor
hermal conductors and therefore impair the temperature distribution in the
inheatable nozzle mouthpiece.
'he same proposal is made in the document DE 41 09 122 CI, except that the
' vear-resistant nozzle mouthpiece is not screwed into the nozzle body but
iixially pressed against the latter by means of a tension ring which encloses the
t louthpiece and is screwed onto the nozzle body. A further drawback is the
lateral introduction of the shut-off needle into the melt channel which entails
great constructional expense. Furthermore, the shut-off part of the needle is not
flush with the nozzle mouthpiece and therefore produces objectionable gate
marks.
It is an object of the invention to overcome these and further drawbacks found
n the prior art and to provide an improved needle valve nozzle realized with
simple means in a cost-effective manner and ensuring a constantly accurate
leedle guidance and sealing. Also, impairments of the temperature distribution
as well as damages on the shut-off part of the shut-off needles and/or the
nozzle mouthpiece are to be avoided.
The main features of the invention are stated in the characterising portion of
:laim 1. Embodiments are the subject-matter of claims 2 to 17.
n a needle valve nozzle for an injection mould for producing injection moulded
)arts, comprising a nozzle body that contains at least one melt channel for a
nelt, said melt channel terminating at or in a nozzle mouthpiece and having a
luidic connection to a mould cavity of the injection mould that is composed of
it least one mould insert, and comprising a shut-off needle which penetrates
he melt channel and the nozzle mouthpiece in such a manner that it is
ongitudinally displaceable and suitable to be moved from an open position into
\ closed position, with said shut-off needle comprising or forming on its lower
)nd a shut-off part which engages in closed position into a sealing seat, and
vith at least one infeed cone provided ahead of the sealing seat for centring the
;hut-off needle, the invention provides according to claim 1 that the nozzle
nouthpiece is made from a highly heat-conductive material and substantially
:ontinues the melt channel cylindrically, that the or each infeed cone for the
.;hut-off needle is formed in a centring body made from a wear-resistant
material which is mounted on and/or in the nozzle mouthpiece by positive fit
.ind that an end section which forms an outlet opening for the melt is
I ingageable with the mould insert.
The nozzle mouthpiece made from a highly heat-conductive material provides a
good temperature distribution well into the gate area, and its simple geometry
permits economical manufacture. It allows for an accurate processing, in
particular from the gate side, and therefore contributes to reducing the
production costs. The centring body is manufactured with high precision as a
separate part. It causes the shut-off needle to enter the sealing seat in a
constantly centrical manner, with the wear-resistant material ensuring a reliable
needle guidance and sealing for a long time. If leakages should nevertheless
occur or the centring body become worn, the latter can be quickly and easily
replaced without the need to disassemble the needle valve nozzle or the nozzle
mouthpiece. Since it is possible at all times to insert another centring body with
a corresponding outlet opening into the nozzle mouthpiece, bigger or smaller
shut-off needles may also be used without any problem. Another advantage of
the solution according to the invention resides in the fact that the centring body
provides the required thermal separation between the needle valve nozzle and
the mould insert. This obviates any need for additional isolation or separation
elements.
Claim 2 further provides that the centring body is formed concentrically with
respect to the longitudinal axis of the needle valve nozzle and comes to rest
against the nozzle mouthpiece with its front. So it immediately abuts the nozzle
mouthpiece, extending the nozzle towards the mould cavity, with the shut-off
needle being inserted into the sealing seat in a constantly concentrical manner
relative to the longitudinal axis.
In the embodiment of claim 3, the centring body comprises a cylindrical collar
portion in the area of which the infeed cone for the shut-off needle is formed.
Introducing the centring body with this collar portion into the nozzle mouthpiece
ensures a reliable guidance. This is particularly advantageous if the centring
body is positioned in the nozzle mouthpiece in a longitudinally displaceable
manner, as provided for by claim 4. The shut-off needle cannot get in contact
with the highly thermally conductive material of the nozzle any longer. Any
damages on the nozzle mouthpiece are efficiently avoided. The needle valve
nozzle has an all-in-all long service life.
In order to align the needle valve nozzle with respect to the mould cavity, the
centring body engages according to claim 5 with its end section into a
cylindrical or conical seat in the mould insert, and claim 6 provides that the end
section engages into the seat in a longitudinally displaceable manner. The
centring seat is preferably concentrical with respect to the gate, i. e. the melt
will pass into the mould cavity by easy flow without hinderance. Simultaneously,
a constantly reliable sealing of the centring body in the mould insert is ensured.
Some variations become apparent from claims 7 and 8 according to which the
sealing seat for the shut-off part of the shut-off needle is formed in the mould
insert or in the end section of the centring body. Moreover, claim 9 provides that
the end section of the centring body confines a part of the mould cavity.
According to the development of claim 10, the shut-off needle is tapered
towards the shut-off part. On the one hand, this has positive effects on the flow-
conditions in the melt channel. On the other hand, the needle guidance is
improved. Claim 11 also contributes to achieve these benefits by providing a
conical and/or rounded transition from the needle portion of greater diameter to
the shut-off part of smaller diameter.
A further important embodiment of the invention becomes apparent from claim
12 according to which between the shut-off part and the needle portion of
greater diameter, a striking edge is formed whose diameter exceeds that of the
needle shut-off part at its sealing edge, with the axial distance between the
sealing edge of the shut-off part and the striking edge being selected, according
to claim 13, so as to provide an angle formed by a connection line from the
sealing edge to the striking edge, which connection line extends through
connection points distributed on parallel diameters, said angle being greater
than the angle of the infeed cone in the centring body, each angle extending
relative to the longitudinal axis of the needle valve nozzle. This ensures that the
rather sensitive sealing edge of the shut-off needle is prevented from striking
the centring body as it enters the latter. In fact, the shut-off part of the needle
will remain contactless. The service life of the needle valve nozzle is further
increased.
Furthermore, claim 14 provides that the difference between the angle of the
connection line from the sealing edge to the striking edge and the angle of the
infeed cone is greater than the greatest possible achievable deflection angle of
the shut-off needle relative to the longitudinal axis of the needle valve nozzle
before the striking edge of the shut-off needle gets in contact with the inner wall
of the centring body. Thus the sealing edge of the shut-off needle is prevented
from striking the centring body. This is efficiently prevented by the striking edge
which may be rounded according to claim 15. In this way, the shut-off needle is
allowed to glide with low friction into the centring body.
In order to prevent the build-up of undesired backpressure in the melt during
the closing process, the infeed cone is formed according to claim 16 by ribs,
axial fillets or the like, which enclose the shut-off needle in a concentrical
slideable manner. The melt which is necessarily displaced as the shut-off
needle enters the outlet opening and the sealing seat, respectively, can easily
escape into the melt channel, i. e. the material compression or the pressure
increase generated during the closing process will automatically be
compensated. Alternatively, the shut-off needle may, according to claim 17,
comprise lateral bulges, flattenings, recesses, or similar, which likewise reduce
the pressure.
Further features, details and advantages will become apparent from the reading
of the claims and from the following description of embodiments in connection
with the drawings, wherein:
Fig, 1 is an enlarged axial sectional view of the lower end of a needle valve
nozzle, and
Fig. 2 is an enlarged axial sectional view of the lower end of another
embodiment of a needle valve nozzle. , o}
The needle valve nozzle, in Fig. 1 designated generally by the reference
numeral 10, forms part of an injection mould (not shown in detail). It has a
preferably externally heated nozzle body 20 in which a materia! duct (not
shown) is formed which delimits a melt channel 30 concentrically with respect
to the longitudinal axis L of the needle valve nozzle 10. A nozzle mouthpiece 40
made from a highly thermally conductive material is inserted, preferably
screwed, from the bottom side into the nozzle body 20, with said nozzle
mouthpiece 40 cylindrically continuing the melt channel 30 downwards without
modification of the cross-section.
A melt, for example a metal, silicone or plastic melt, is supplied via the melt
channel 30 into a mould cavity (not shown in detail) for processing. Said mould
cavity is formed between at least two mould inserts 50 which are mounted on a
moulding plate (not shown) and confine a gate 51 concentrically with respect to
the longitudinal axis L of the hot runner nozzle 10.
A centring body 80 made from a wear-resistant material is arranged between
the nozzle mouthpiece 40 and the mould inserts 50, said centring body 80
centring the needle valve nozzle 10 with respect to the gate 51 and forming
together with the air chamber 22 which encloses the nozzle mouthpiece 40 and
the nozzle body 20 a thermal separation between the needle valve nozzle 10
and the mould inserts 50, i. e. the highly heat-conductive nozzle mouthpiece 40
allows the flowable melt to be kept at a constantly high temperature on its way
to the mould cavity. In addition, the centring body 80 prevents heating of the
30ol mould inserts 50.
^s illustrated in Fig. 1, the centring body 80, which is all-in-all rotationally
symmetrical with respect to the longitudinal axis L, comprises a broad flanged
3dge 81 and a narrow cylindrical collar portion 82. The latter is inserted into the
Tielt channel 30 and in the nozzle miouthpiece 40, respectively, from the bottom
5ide and reciprocates in them in longitudinal direction.
\t its end facing the mould cavity, the centring body 80 forms a cylindrical end
section 84 which engages in a longitudinally displaceable manner into a
ylindrical seat 54. Said centring seat 54 formed by the mould inserts 50 is
;oncentrical with respect to the gate 51 and may have a slightly conical form in
in upper section 55 in order to facilitate the introduction of the centring body 80
vith its end section 84 during assembly. Its outer diameter is selected so as to
)rovide a pressure-tight connection and to prevent the melt from entering the
air chamber 22. Simultaneously, longitudinal movements of the centring body
80 in the seat 54 are possible so that thermally induced changes in length of
the needle valve nozzle 10 can be compensated, if necessary. The end face 85
of the end section 84 is preferably flat, just as the bottom surface (not specified)
of the centring seat 54, so as to provide an accurate fit.
It will be noted that the melt channel 30 is continued through the centring body
80 whose end section 84 forms an outlet opening 44 for the melt. The centrical
alignment of the hot runner nozzle 10 permits unhindered flow of the melt
through the gate 51 into the mould cavity.
An axially displaceable shut-off valve 60 is provided for opening and closing the
outlet opening 44. The shut-off valve 60 reciprocates in the melt channel 30 in
ongitudinal direction and can be moved by a pneumatic drive (not shown) from
an open position into a closed position. The shut-off valve 60, which is at least
sectionally cylindrical and comprises several stepped diameters along the
ongitudinal axis L, has at its end a shut-off part 70 designed to engage in
closed position through the end section 84 of the centring body 80 into a
sealing seat D. In the embodiment shown in Fig. 1, said sealing seat D is
provided ahead of the gate 51 in the mould inserts 50 and is of tapered form in
ts upper portion 57 so as to allow the shut-off part 70, supported by the
iccumulated melt, to enter the sealing seat D in a low-friction manner.
'he transitions from the needle portions of greater diameter to the sections
; laving a smaller diameter may be conical or rounded, with a striking edge 74
lieing formed between a needle portion 64 and the abutting shut-off part 70
' /hose diameter exceeds that of the sealing edge 72 at the end of the shut-off
I .art 70 of the shut-off needle 60.
II order to prevent damages on the sensitive shut-off part 70 and to keep the
: utiet opening 44 permanently pressure-tightly sealed, the striking edge 74 is
'. esigned to align the shut-off needle 60 by means of the centring body 80 in
c ase that said shut-off needle 60 were deflected from its concentric position in
t: le melt channel 30. To this end, an infeed cone 46 is provided in the collar
|: ortion 82 of the centring body 80, said infeed cone being concentrical relative
to the longitudinal axis L and continuing by a cylindrical guiding portion 83
whose inner diameter is insignificantly greater than the outer diameter of the
needle portion 64 of the shut-off needle 60. A cone 86 which is formed ahead
of the outlet opening 44 in the centring body 80 reduces the inner diameter of
the guiding portion 83 to the diameter of the shut-off part 70 of the shut-off
needle 60.
When moving from its open position into its closed position, the shut-off needle
60 is automatically aligned by the striking edge 74 and the infeed cone 46 so as
to be concentric with respect to the longitudinal axis L, with the needle portion
64 being further advanced within the guidance section 83 of the centring body
80 without changing its alignment until the shut-off part 70 reaches the sealing
seat D. The sensitive sealing edge 72 of the shut-off needle 60 is prevented
from striking the nozzle mouthpiece 40 or the centring body 80. Damages to the
shut-off needle 60 are thus avoided. Since the preferably slightly rounded
striking edge 74 of the shut-off needle 60 is relatively insensitive, and the
centring body 80 is made from a wear-resistant material, there is no problem in
the case that the striking edge 74 gets in contact with the infeed cone 46.
In order to prevent the build-up of undesired backpressure in the melt during
the closing process of the shut-off valve 60, the infeed cone 46 in the centring
body 80 is formed by ribs, axial fillejts (not specified) or the like, which enclose
the shut-off needle 60 in a concentrically slideable manner. Additionally or
alternatively, the shut-off needle 60 may be provided in the area of the needle
portion 64 with lateral bulges or recesses 66 so as to allow the melt displaced
by the shut-off needle 60 to freely flow back into the melt channel 30.
In the embodiment shown in Fig. 2, the end section 84 of the centring body 80,
yvhich is provided with a convex end face, confines a portion of the mould
cavity. The centring seat 54 for the centring body 80 is still provided by the
Tiould inserts 50, whereas the sealing seat D for the shut-off part 70 of the
shut-off needle 60 is arranged in the end section 84 of the centring body 80.
The outlet opening 44 and the gate 51 coincide with one another, i. e. the melt
Dasses directly through the centring body 80 into the mould cavity.
It will be noted in Fig. 2 that the centring body 80 reciprocates in the nozzle
mouthpiece 40 just as in the seat 54 of the mould inserts 50 in a longitudinal
direction, so that a narrow motion-induced gap may form between the flanged
edge 81 and the end face 41 of the nozzle mouthpiece 40. This ensures that
the needle valve nozzle 10 can elongate when being heated without modifying
the cavity boundary.
It is important to select the axial distance A between the sealing edge 72 of the
shut-off part 70 and the striking edge 74 in such a manner that the angle • of a
connection line V from the sealing edge 72 to the striking edge 74 which
extends through connection points distributed on parallel diameters is greater
than the cone angle • of the infeed cone 46 in the collar portion 82 of the
centring body 80, each angle being relative to the longitudinal axis L of the hot
runner nozzle 10. Thus the shut-off needle 60 is in any case stopped with its
striking edge 74 on the infeed come 46 and guided through the guiding portion
33 so as to allow the shut-off part 70 to enter the sealing seat D in a contactless
Tianner. Damages on the sealing edge 72 are almost completely precluded.
The invention is not limited to any of the embodiments described above, but
ncludes many variations and modifications. For example, the centring body 80
s preferably made from a powder metallurgical material. It is conceivable,
lowever, to use other materials having a high wear resistance. Depending on
he particular embodiment, the flanged edge 81 of the centring body 80 may
encompass or enclose the lower end of the nozzle mouthpiece 40.
-urthermore, the shut-off needle 60 may be flush with the injection moulded
)art (not shown) or leave a mark on it. The embodiment shown in Fig. 2 allows
n any case and at any time for easy replacement of the gate point if the
;entring body 80 is worn.
,\ll features and advantages which become apparent from the claims, the
ijescription and the drawings, including design details, spatial arrangements
; ind process steps, may be essential to the invention, both individually and in a
I ireat variety of combinations.
Claims
1. Needle valve nozzle (10) for an injection mould for producing injection
moulded parts, comprising a nozzle body (20) that contains at least one melt
channel (30) for a melt, said melt channel (30) terminating at or in a nozzle
mouthpiece (40) and having a fluidic connection to a mould cavity of the
injection mould that is formed by at least one mould insert (50), and
comprising a shut-off needle (60) which penetrates the melt channel (30)
and the nozzle mouthpiece (40) in such a manner that it is longitudinally
displaceable and suitable to be moved from an open position into a closed
position, with said shut-off needle (60) comprising or forming on its lower
end a shut-off part (70) which engages in closed position into a sealing seat
(D), and with at least one infeed cone (46) provided ahead of the sealing
seat (D) for centring the shut-off needle (60), characterised in that the
nozzle mouthpiece (40) is made from a highly heat-conductive materia! and
substantially continues the melt channel (30) cylindrically, wherein the or
each infeed cone (46) for the shut-off needle (60) is formed in a centring
body (80) made from a wear-resistant material which is mounted on and/or
in the nozzle mouthpiece (40) by positive fit and wherein an end section (84)
which forms an outlet opening (44) for the melt is engageable with the
mould insert (50).
2. Needle valve nozzle according to claim 1, characterised in that the
centring body (80) is concentrical with respect to the longitudinal axis (L) of
the needle valve nozzle (10) and comes to rest against the nozzle
mouthpiece (40) with its front.
3. Needle valve nozzle according to claim 1 or claim 2, characterised in that
the centring body (80) comprises a cylindrical collar portion (82) in the area
of which the infeed cone (46) for the shut-off needle (60) is formed.
4. Needle valve nozzle according to any one of claims 1 to 3, characterised in
that the centring body (80) is positioned in the nozzle mouthpiece (40) in a
longitudinally displaceable manner.
5. Needle valve nozzle according to any one of claims 1 to 4, characterised in
that the centring body (80) engages with its end section (84) into a
cylindrical or conical seat (54) provided in the mould insert (50).
6. Needle valve nozzle according to claim 5 or 6, characterised in that the
end section (84) of the centring body (80) engages into the seat (54) in a
longitudinally dispiaceable manner.
7. Needle valve nozzle according to any one of claims 1 to 6, characterised in
that the sealing seat (D) for the shut-off part (70) of the shut-off needle (60)
is formed in the mould insert (50).
8. Needle valve nozzle according to any one of claims 1 to 6, characterised in
that the sealing seat (D) for the shut-off part (70) of the shut-off needle (60)
is formed in the end section (84) of the centring body (80).
9. Needle valve nozzle according to claim 8, characterised in that the end
section (84) of the centring body (80) confines a part of the mould cavity.
10. Needle valve nozzle according to any one of claims 1 to 9, characterised in
that the shut-off needle (60) is tapered towards the shut-off part (70).
11. Needle valve nozzle according to claim 10, characterised in that the
transition from the needle portion (64) of greater diameter to the shut-off
part (70) of smaller diameter is conical and/or rounded.
12.Needle valve nozzle according to claim 11, characterised in that between
the shut-off part (70) and the needle portion (64) of greater diameter, a
striking edge (74) is formed whose diameter exceeds that of the needle
shut-off part (70) at its sealing edge (72).
13. Needle valve nozzle according to claim 12, characterised in that the axial
distance (A) between the sealing edge (72) of the shut-off part (70) and the
striking edge (74) is selected so as to provide an angle (• ) formed by a
connection line (V) from the sealing edge (72) to the striking edge (74)
extending through connection points distributed on parallel diameters, which
angle (• ) is greater than the angle (• ) of the infeed cone (46) in the centring
body (80), each angle being relative to the longitudinal axis (L) of the needle
valve nozzle (10).
14. Needle valve nozzle according to claim 13, characterised in that before the
striking edge (74) of the shut-off needle (60) contact the inner wall of the
centring body (80) the difference between the angle (• ) and the angle (• ) is
greater than the greatest possible achievable deflection angle of the shut-off
needle (60) relative to the longitudinal axis (L) of the needle valve nozzle
(10).
15. Needle valve nozzle according to any one of claims 12 to 14, characterised
in that the striking edge (74) is rounded.
16. Needle valve nozzle according to any one of claims 1 to 15, characterised
in that the infeed cone (46) is formed by ribs, fillets or the like, which
enclose the shut-off needle (60) in a concentrically slideable manner.
17. Needle valve nozzle according to any one of claims 1 to 16, characterised
in that the shut-off needle (60) comprises lateral bulges, flattenings,
recesses (66) or similar.

The invention relates to a needle
valve nozzle (10) for an injection mould, comprising
a nozzle body (20) that contains at least one melt
channel (30), the latter terminating against or in
a nozzle mouthpiece (40) and having a fluidic
connection to a mould cavity of the injection mould
that is formed by at least one mould insert (50).
A shut-off needle (60) penetrates the melt channel
(30) and the nozzle mouthpiece (40) and can be
displaced longitudinally through said parts, moving
from an open position into a closed position. At
least one infeed cone (46) is provided upstream
of a seal seat (D), in order to centre the shut-off
needle (60), the lower end of which forms a shut-off
part (70). The aim of the invention is to guarantee
a constantly precise guidance and sealing of the
needle, whilst at the same time preventing an
impairment of the temperature distribution in the
vicinity of the nozzle tip. To achieve this, the nozzle
mouthpiece (40) consists of a material with high
thermal conductivity, whilst the or each infeed cone
(46) for the shut-off needle (60) is configured in
a centring body (80) consisting of wear-resistant
material and running concentrically with the
longitudinal axis (L) of the needle valve nozzle
(10). The centring body is held against and/or in the
nozzle mouthpiece (40) in a positive-fit and its end
section (84), which forms an outlet opening (44) for

Documents:

01600-kolnp-2005-abstract.pdf

01600-kolnp-2005-claims.pdf

01600-kolnp-2005-description complete.pdf

01600-kolnp-2005-drawings.pdf

01600-kolnp-2005-form 1.pdf

01600-kolnp-2005-form 3.pdf

01600-kolnp-2005-form 5.pdf

01600-kolnp-2005-international publication.pdf

1600-KOLNP-2005-ABSTRACT 1.1.pdf

1600-kolnp-2005-abstract.pdf

1600-KOLNP-2005-AMANDED PAGES OF SPECIFICATION.pdf

1600-kolnp-2005-assignment.pdf

1600-kolnp-2005-assignment1.1.pdf

1600-KOLNP-2005-CANCELLED PAGES.pdf

1600-KOLNP-2005-CLAIMS.pdf

1600-KOLNP-2005-CORRESPONDENCE 1.3.pdf

1600-KOLNP-2005-CORRESPONDENCE-1.1.pdf

1600-KOLNP-2005-CORRESPONDENCE-1.2.pdf

1600-kolnp-2005-correspondence.pdf

1600-kolnp-2005-correspondence1.4.pdf

1600-KOLNP-2005-DESCRIPTION (COMPLETE) 1.1.pdf

1600-kolnp-2005-description (complete).pdf

1600-kolnp-2005-drawings.pdf

1600-kolnp-2005-examination report.pdf

1600-KOLNP-2005-FORM 1 1.1.pdf

1600-kolnp-2005-form 1.pdf

1600-kolnp-2005-form 13.1.pdf

1600-KOLNP-2005-FORM 13.pdf

1600-kolnp-2005-form 18.1.pdf

1600-kolnp-2005-form 18.pdf

1600-KOLNP-2005-FORM 2.pdf

1600-KOLNP-2005-FORM 3-1.1.pdf

1600-kolnp-2005-form 3.1.pdf

1600-kolnp-2005-form 3.pdf

1600-kolnp-2005-form 5.1.pdf

1600-kolnp-2005-form 5.pdf

1600-KOLNP-2005-FORM-27.pdf

1600-kolnp-2005-gpa.pdf

1600-kolnp-2005-gpa1.1.pdf

1600-kolnp-2005-granted-abstract.pdf

1600-kolnp-2005-granted-claims.pdf

1600-kolnp-2005-granted-description (complete).pdf

1600-kolnp-2005-granted-drawings.pdf

1600-kolnp-2005-granted-form 1.pdf

1600-kolnp-2005-granted-form 2.pdf

1600-kolnp-2005-granted-letter patent.pdf

1600-kolnp-2005-granted-specification.pdf

1600-kolnp-2005-intenational publication.pdf

1600-kolnp-2005-international search report.pdf

1600-kolnp-2005-others.pdf

1600-kolnp-2005-pct priority document notification.pdf

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1600-KOLNP-2005-REPLY TO EXAMINATION REPORT.pdf

1600-kolnp-2005-reply to examination report1.1.pdf

1600-kolnp-2005-specification.pdf

1600-KOLNP-2005-TRANSLATED COPY OF PRIORITY DOCUMENT.pdf

1600-kolnp-2005-translated copy of priority document1.1.pdf

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Patent Number 247115
Indian Patent Application Number 1600/KOLNP/2005
PG Journal Number 13/2011
Publication Date 01-Apr-2011
Grant Date 28-Mar-2011
Date of Filing 10-Aug-2005
Name of Patentee GUNTHER GMBH & CO., METALLVERARBEITUNG
Applicant Address SCHSENBERGER STRASSE 1, 35066 FRANKENBERG/EDER
Inventors:
# Inventor's Name Inventor's Address
1 GUNTHER, HERBERT UNTERAUSTRASSE 14, 35108 ALLENDORF
PCT International Classification Number B29C 45/28
PCT International Application Number PCT/EP2004/001607
PCT International Filing date 2004-02-19
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 203 02 845.7 2003-02-20 Germany