Title of Invention

METHOD FOR THE CONTINUOUS PRODUCTION OF TUBULAR BODIES

Abstract The invention relates to a method and a device for the continuous production of tubular bodies (1) with an internal longitudinal separating wall (2) for the production of tubes having two chambers (9, 9") which are separated from each other. According to said method an endless extruded tube (11) having an internal longitudinal separating wall (2) is produced and individual tubular bodies (1) of a defined length are cut off by means of a cutting device and subjected to further processing. According to the invention the tubular body (1) is made from a film (3) having a central, semicircular part (4) and two angled lateral wings (5). The semicircular part (4) is covered by a second film (6) serving as separating wall (2). A transverse cutter having two rotating blades (10, 10") is used as cutting device. The rounded extruded tube (11) having a longitudinal separating wall (2) is fed between the two rotating blades (10, 10") after having been collapsed and oriented in such a way mat the collapsed extruded tube (11) has a central three-layered part (C) which consists of the collapsed, oriented separating wall (2) in the middle and an upper and lower flat tubular wall body section (12) on either side, as well as two two-layered areas (A, A") which adjoin the three-layered area on both sides. In this way each two-layered area (A, A") consists of bent, superimposed tubular body wall sections (13).
Full Text METHOD FOR THE CONTINUOUS PRODUCTION OF TUBULAR BODIES
The invention relates to a process for the continuous production
of tubular bodies with an internal longitudinal separating wall
for producing tubes with two chambers which are separated from
one another, an endless line of tubing with internal
longitudinal separating wall being produced, from which
individual tubular bodies with a predetermined length are cut
for further processing by means of a cutting device, and a
device for carrying out the process.
Such a process is known from DE-A1-195 22 169, wherein the
tubular bodies cut to the desired length are secured to a tube
head by a separating wall.
In order to produce tubes without a separating wall it is known
to cut the tube length desired in each case by means of a
transverse cutter between two rotating blades, wherein the
rotational speed can be adjusted in such a way that tubular
bodies of any length, and in a wide range can be cut.
Problems occur when using such transverse cutters for lines of
tubing with internal separating wall, the separating wall
preferably extending in the region of the diameter, because,
owing to the flattening of the line of tubing for the cut,
instead of the usual two bends in the edge region, six bends are
made as a result of the separating wall corresponding
approximately to the diameter which is short in comparison with
the flattened wider tubular wall sections which form
unfavourable preconditions for further processing. For example,
owing to flattening the internal separating wall is pulled
strongly and there is the danger that the connecting seam may
become detached from the tubular body, which would damage the
tightness of the chambers. The appearance of the tube is also
affected by a plurality of bends.
The object of the invention is to improve a process of the type
mentioned at the outset so tubular bodies with an internal
longitudinal separating wall can also be cut to any length by a
cutting device without making additional bends and without
causing any damage, and to provide a device for carrying out the
process.
Accordingly, the present invention provides a process for the
continuous production of tubular bodies with an internal longitudinal
separating wall for producing tubes with two chambers which are separated
from one another, and endless line of tubing with internal longitudinal
separating wall being produced, from which individual tubular bodies with a
predetermined length are cut for processing by means of a cutting device,
characterized in that the tubular body is produced from a film with a central
semicircular part and two bent lateral wings, the semi-circular part being
covered by a second film serving as a separating wall, and in that a
transverse cutter with two rotating blades serves as cutting device and the
resulting rounded line of tubing with longitudinal separating wall is fed
between the two rotating blades so as to be flattened and oriented in such a
way that the flattened line of tubing has a central three-layered region
consisting of the flat and extended oriented separating wall in the centre and
a flat overlying and a flat underlying tubular body wall section and two two-
layered regions which adjoin the three-layered region on either side, each
two-layered region consisting of bent, superimposed tubular body wall
sections.

The present invention also provides a device for carrying out the above
process, characterized in that the parallel axes of rotation of the rotating
blades, between which the line of tubing is fed, are provided about the central
axis of the line of tubing with internal longitudinal separating wall so as to be
jointly rotatable and lockable.
The invention will be described in more detail below with the aid of an
embodiment and with reference to the accompanying drawings, in which :
Fig. 1 shows half a tubular body with secured separating wall in
cross-section;
Fig. 2 shows a tubular body with internal longitudinal
separating wall in cross-section;
Fig. 3a shows the position of a tubular body with internal
separating wall between two rotating blades of a transverse
cutter;
Fig. 3b shows the flattened position of the tubular body with
internal separating wall immediately prior to a cut;
Fig. 4 shows the cutting position of a tubular body with
internal separating wall in a conventional use of a transverse
cutter according to the state of the art.
Fig. 1 shows . half a tubular body 1 with separating wall 2 in
cross-section which comprises a film 3 with a central
semicircular part 4 and two bent lateral wings 5, the
semicircular part 4 being covered by a second film 6 which later
serves as separating wall 2. The edges 7 of the second film 6
are secured directly onto the region of the lateral wings 5
adjoining the semicircular part 4 so as to be sealed. The free
ends of the lateral wings 5 are connected to one another in a
second stage by producing an overlapping seam 8, whereby a
tubular body 1 with internal separating wall 2 arranged along
its diameter is formed, the cross-section of which is shown in
Fig. 2.
The tubular body is divided into two chambers (9, 91) of equal
size by the separating wall 2.
If a line of tubing produced in such a way is now cut to length
in a known manner in a transverse cutter, for which purpose it
must be flattened, the cutting position shown in Fig. 4 with
three bends Kl, K2, K3 on either side would be produced which
could have the above-described negative consequences.
Fig. 3 shows a solution according to the invention.
Fig. 3a shows the opposing positions of the rotating blades 10,
10' of a transverse cutter oriented with respect to a line of
tubing 11 with a horizontal separating wall 2 which divides it '
symmetrically. Here, the blades 10, 10' are rotated about the
angle a in relation to the horizontal separating wall 2 about
the central axis Z of the, in this case, rounded tubular body 1
and locked. In the given circumstances, the angle a is 32.66°. It
is also possible to arrange the blades horizontally and to feed
the tubular body 1 rotated about the angle a to the blades (not
shown).
Fig. 3b shows the flattened line of tubing immediately prior to
a cut, wherein it [has] a central three-layered region C which
consists of the flattened separating wall 2 and a overlying and
underlying wall section 12, 12' in each case and two two-layered
regions A, A1 adjoining both ends of the region C which consist
solely of bent (U-shaped) superimposed wall sections 13, 13'. It
is clear from this figure that, in this case, only one bend K is
produced on either side as is also the case in a tubular body
without a separating wall. Any single or multi-layer plastics
material films with and without blocking layers made of plastics
material, aluminium or glass can be used. All round or rounded,
for example oval, tubular bodies with a separating wall can be
used, the width of which is smaller than that of the flattened
tubular body.
WE CLAIM :
1. A process for the continuous production of tubular bodies (1) with an
internal longitudinal separating wall (2) for producing tubes with two chambers
(9, 9') which are separated from one another, and endless line of tubing (11)
with internal longitudinal separating wall (2) being produced, from which
individual tubular bodies (1) with a predetermined length are cut for
processing by means of a cutting device, characterized in that the tubular
body (1) is produced from a film (3) with a central semicircular part (4) and
two bent lateral wings (5), the semi-circular part (4) being covered by a
second film (6) serving as a separating wall (2), and in that a transverse cutter
with two rotating blades (10, 10') serves as cutting device and the resulting
rounded line of tubing (11) with longitudinal separating wall (2) is fed between
the two rotating blades (10, 10') so as to be flattened and oriented in such a
way that the flattened line of tubing (11) has a central three-layered region (C)
consisting of the flat and extended oriented separating wall (2) in the centre
and a flat overlying and a flat underlying tubular body wall section (12) and
two two-layered regions (A, A1) which adjoin the three-layered region on either
side, each two-layered region (A, A') consisting of bent, superimposed tubular
body wall sections (13).
2. Device for carrying out the process as claimed in claim 1,
characterized in that the parallel axes of rotation of the rotating blades (10,
10'), between which the line of tubing (11) is fed, are provided about the
central axis (Z) of the line of tubing (11) with internal longitudinal separating
wall (2) so as to be jointly rotatable and lockable.
3. A process for the continuous production of tubular bodies,
substantially as herein described, particularly with reference to and as
illustrated in the accompanying drawings.


The invention relates to a method and a device for the continuous production of
tubular bodies (1) with an internal longitudinal separating wall (2) for the production
of tubes having two chambers (9, 9') which are separated from each other. According
to said method an endless extruded tube (11) having an internal longitudinal separating
wall (2) is produced and individual tubular bodies (1) of a defined length are cut off
by means of a cutting device and subjected to further processing. According to the
invention the tubular body (1) is made from a film (3) having a central, semicircular
part (4) and two angled lateral wings (5). The semicircular part (4) is covered by a
second film (6) serving as separating wall (2). A transverse cutter having two rotating
blades (10, 10') is used as cutting device. The rounded extruded tube (11) having a
longitudinal separating wall (2) is fed between the two rotating blades (10, 10') after
having been collapsed and oriented in such a way mat the collapsed extruded tube (11)
has a central three-layered part (C) which consists of the collapsed, oriented separating
wall (2) in the middle and an upper and lower flat tubular wall body section (12) on
either side, as well as two two-layered areas (A, A') which adjoin the three-layered area
on both sides. In this way each two-layered area (A, A') consists of bent, superimposed
tubular body wall sections (13).

Documents:

in-pct-2001-333-kol-abstract.pdf

IN-PCT-2001-333-KOL-ASSIGNMENT-1.1.pdf

in-pct-2001-333-kol-assignment.pdf

in-pct-2001-333-kol-claims.pdf

IN-PCT-2001-333-KOL-CORRESPONDENCE 1.1.pdf

in-pct-2001-333-kol-correspondence.pdf

IN-PCT-2001-333-KOL-CORRESPONDENCE1.1.pdf

in-pct-2001-333-kol-description (complete).pdf

in-pct-2001-333-kol-drawings.pdf

in-pct-2001-333-kol-examination report.pdf

in-pct-2001-333-kol-form 1.pdf

in-pct-2001-333-kol-form 18.pdf

in-pct-2001-333-kol-form 2.pdf

IN-PCT-2001-333-KOL-FORM 3-1.1.pdf

in-pct-2001-333-kol-form 3.pdf

IN-PCT-2001-333-KOL-FORM 5-1.1.pdf

in-pct-2001-333-kol-form 5.pdf

IN-PCT-2001-333-KOL-GPA-1.1.pdf

in-pct-2001-333-kol-gpa.pdf

IN-PCT-2001-333-KOL-GRANTED-ABSTRACT.pdf

IN-PCT-2001-333-KOL-GRANTED-CLAIMS.pdf

IN-PCT-2001-333-KOL-GRANTED-DESCRIPTION (COMPLETE).pdf

IN-PCT-2001-333-KOL-GRANTED-DRAWINGS.pdf

IN-PCT-2001-333-KOL-GRANTED-FORM 1.pdf

IN-PCT-2001-333-KOL-GRANTED-FORM 2.pdf

IN-PCT-2001-333-KOL-GRANTED-LETTER PATENT.pdf

IN-PCT-2001-333-KOL-GRANTED-SPECIFICATION.pdf

IN-PCT-2001-333-KOL-OTHERS.pdf

in-pct-2001-333-kol-priority document.pdf

in-pct-2001-333-kol-reply to examination report.pdf

in-pct-2001-333-kol-specification.pdf

in-pct-2001-333-kol-translated copy of priority document.pdf


Patent Number 247560
Indian Patent Application Number IN/PCT/2001/333/KOL
PG Journal Number 16/2011
Publication Date 22-Apr-2011
Grant Date 20-Apr-2011
Date of Filing 23-Mar-2001
Name of Patentee AISA AUTOMATION INDUSTRIELLE S.A.
Applicant Address ROUTE DE SAVOIE, CH-1896 VOUVRY
Inventors:
# Inventor's Name Inventor's Address
1 KELLER GERHARD CHEMIN DU GRAMMONT 19 CH-1805, JONGNY
PCT International Classification Number B31B 19/14
PCT International Application Number PCT/EP00/00131
PCT International Filing date 2000-01-11
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 199 00 670.9 1999-01-11 Germany