DE1660169A1 - Spinning nozzle and method for producing a spinning channel of a spinning nozzle - Google Patents

Description

OR. ELISABETH JUNG AND DH. VOLKER VOSS (US _Λ PATENT ADVOCATE. '

• MÖNCHEN 2 »· S I EQ ES 8THAS8E2 · · TE LEFON 3450 · 7th TELEaHAMM-ADREeSE: INVENT / MONCH EN

AiOJ 1118 + a ho / J / sh; _A.

ft ". · **: · .. 1966

KUNSTZIJl) S UIiI ¹ S NV Arnhem / Holland

"Spinneret and Process for Making One Spinning channel of a spinneret *

Priority: December 10, 1965 / Netherlands Registration number j 65-i6ü6V

The invention relates to a spinneret for producing τοη a Profile-having threads made of plastic mass, in particular of thread with a dumbbell-shaped, Y-shaped or star-shaped Cross section, punch a method of making a Splitting channel of such a spinneret.

To produce such threads, the spinning channel must be at the discharge end have a cross-section, the shape of which is essential from the thread cross-section. To a spinning channel one Spinnerets are in terms of the material of the channel wall and of the flerstellungsverfahrenß high demands, since the

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Duct wall. Heat-resistant and durable for a reasonably long time against pressure and the aggressive action of the extruded Plastic compound for the threads should be. Hence the materials from which the spinnerets are made are difficult to machine and the spinnerets obtained are very expensive.

For this reason, the spinnerets are often made of one Made of high quality material and provided with simple, cylindrical or slightly conical holes in which inserts are made high-quality material, each containing a spinning channel, are attached ,, *

KV spinning channel for threads with circular cross-section includes usually a wide inlet zone with a more or less cylindrical wall, which via an intermediate piece with a slightly conical shape into an outlet zone with a cylindrical wall smaller diameter passes. Am such, enclosing a channel *. tz is produced, for example, in that metal is deposited on a core having the desired shape of the channel, the core is removed with chemical coats and regrind the outside of the insert until it enters the spinneret bore In this way it is possible to produce a channel with any desired cross-sectional shape by cutting from a core goes out with the desired shape. However, such inserts are still very tedious and costly to manufacture.

Purpose of the invention is to provide First and foremost, a spinneret very simple way available which won a Hehrzahl by programming holes that can be produced easily and quickly

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having. Accordingly, the invention relates to a spinneret for the production of threads having a profile made of synthetic material, which is characterized in that the wall of the spinning channel provided with a profile consists of a thin-walled tube, the exit zone of which has a profile inside and outside.

The invention is further characterized in that it has a wall of the spinning channel8 is preferably formed by a thin-walled tube which fits into and over the bore of a spinneret part of its length with its entire circumferential surface on the The wall of the bore rests, while the exit zone of the tube * rests only with the edges of the profile on the wall of the bore.

Furthermore, the invention is characterized in that the actual circumference and the wall thickness of the one having a profile Exit zone of the tube practically equal to the circumference or the Wall thickness of that zone of the tube * that is not a profile having.

In another embodiment of the invention, the spinneret is used provided with a protruding tube at the bottom, the coaxial tube is arranged to form a spinning channel and whose outlet zone has a profile inside and outside and only with the Xanten of the profile rests against the wall of a bore, which is preferably made in a SLeraent that the protruding tube surrounds.

The edges of the profile that lie against the hand of the bore are preferably straight, but a spinning channel is used

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If you want a profile, these can also be shaped like a screw line .

In order to avoid that the opening of the outlet zone having the profile has cracks or burrs and to achieve that it is really perpendicular to the axis of the spinning channel , it is useful according to the invention to taper the outlet end of the thin-walled tube "before attaching the profile from the outside Because of the thinner wall thickness, the tapered land can be more easily compressed without cracks or irregular edges.

However, it is difficult to create a spinning channel with acute-angled profile edges to manufacture. If the thread produced is nevertheless to have acute-angled profile edges, according to the invention, at the the exit zone of the spinning canal having the profile is a separate, narrowed passage are arranged, which has a smaller diameter than the enveloping circle of the profile cross-section of the Spinning channel. Such a narrowed passage can be achieved by means of a ring which is attached inside the spinneret bore and covers the rounded edges of the duct profile.

This ring can also be part of a grain which surrounds a small tube protruding from the spinneret. '-

According to the invention, a spinning channel having a profile such as is made as follows: The thin-walled tube is placed in a special tool with the inde to be provided with the profile

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Having Hehrzahl of jaws _t are exactly radially movable with particularly high precision, and the inner wall of the tube is brought from the outside and without further StütZ3 in the desired Fora The number of clamping jaws in this case corresponds to the Kahl of the recesses between the profiled edges ,, and the clamping jaws are provided with flowing roundings, so that a gradual transition from the profile zone of the tube to the zone without profile is achieved *

The invention is explained in more detail below with reference to the drawings _? which illustrate one embodiment of the spinneret according to the invention ^

Fig. 1 shows a cross section of an uncompressed tube which encloses a channel _{or the like}

Pig 2 is a cross section of a partially compressed tube _β

Pig _o 3 shows a cross section of a tube compressed to the desired profile.

Fig «4 shows in longitudinal section a bore in a spinneret which is provided with a part shown in the side elevation.

When producing an outlet zone of the Sttinn canal with a profile for melt spinning or> 2xtruding a plastic compound into threads with a Y-shaped cross-section, a tube 1 is assumed; whose wall thickness (cf. FIG. 1) _t, based on the diameter, is small.

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The tube 1 is surrounded by a special tool which has a number of clamping jaws which can compress the tube to the desired shape, since these can be moved in the radial direction at the same time with particularly great precision. The production of an outlet opening with a Y-shaped cross section, as described above, requires three clamping jaws _t , which are indicated schematically in FIGS. 1 to 3 by the arrows 2. The production of a dumbbell-shaped cross-section consequently requires two clamping jaws and that of an X-shaped cross-section requires four clamping jaws > from which the tube was made. If necessary, the compression can be done while heating the material.

Fig. 2 shows an important stage during the compression of the tube. "Through the movement of the clamping jaws, the originally circular cross-section has been compressed into a triangle ₉ with straight sides and rounded corners 3 the clamping jaws only partially encompass the tube. Consequently, the rounded corners 3 of the triangle protrude beyond the originally circular circumference of the tube 1 (indicated by the dashed line in FIG. Z) .

Upon further compression to the shape shown in Fig. 3, the straight sides of the triangle are pressed further inwards,

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i'oäuroh the channel its Y? "egg-shaped * C * uers ©? ßiife1j ®2 * l2alt * Rounded tacken 3 now again touch k ä.en District ₉ country the intervening arc form, so to speak, the saoh ianett curved parts of the original circle The circumference and the wall thickness of the tube were not changed. Only part of its length is provided with a profile of this type, which gradually merges into the non-profiled zone. 52s it can be seen that for a given canal cross-section the diameter and the wall thickness of the tube must be coordinated with one another. FIG. H shows such a tube 1 which is arranged in a bore 5 of a spinneret 6. The bore 5 is simple and cylindrical or slightly conical and does not have to meet the requirements otherwise placed on spinning channels. The height 1 is pressed into the bore 5 or cemented therein and, like the known inserts, can easily be removed again and exchanged for another tube. Srfindungsgeraäö the height is compressed over about a third of its length and provided with a profile, this third forming the exit zone 7. The entire outer surface of the uncompressed zone rests against the wall of the bore, while the exit zone 7 rests against it only with the strips that correspond to the rounded edges 3 of the cross-section of FIG. At its upper brew, the bore 5 is bevelled, and the tube 1 is pulled over the fold and forms a bead 8, whereby the space between the bore 5 and the tube 1 is sealed. The flange 8 also serves to facilitate the inflow of the splint compound.

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The lower end of the emergence zone 7 «travels a conical point 9 on. Before the tube 1 is compressed, it is from conically tapered on the outside, so that the wall thickness in the direction of the Exit opening decreases. This causes the squeezing no high stresses in the opening edge, which could lead to breakage. In addition, the lower end of the exit zone remains 7 thereby · better in its perpendicular position to the canal axis, so that regrinding and repolishing for completion dee Spinning channel is not required. This is especially because of this Advantage, as it is extremely difficult to avoid the formation of burrs at the lower edge of the exit zone 7 during straight grinding «' which lead to irregularities in the threads produced.

If a spinach is pressed through the spinning channel under high pressure, the wall of the channel (ie the wall of the tube 1) is pressed against the bore 5. Since the wall thickness of the tube 1 is relatively small, the axial pressure of the Hasse on the annular cross-section is less than the friction between the bore 5 and the tube l _r, which acts on a much larger, cylindrical surface and depends on the radial pressure of the Hasse *. The non-profiled zone of the tube 1 therefore always sticks in the bore 5. The splxmmaeae, which slides through the channel under gradually decreasing pressure, flows through the zone of the tube 1 gradually merging into the profile and finally reaches the one with a profile provided exit zone 7, the pressure of the mass striving to expand the profile again. However, since the rounded edges 3 of the profile are in contact with the bore 5 and the circular arcs of the

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If the profile is under tension, these arcs in the position shown in Pig »3 cannot return to the position in Pig. 2 expand shape illustrated; so that the profile cross-section of the
Tube 1 is retained despite the low wall thickness of the tube.

mentioned above- is the transition from the non-profiled to the profiled zone of the tube 1
flowing., whereby it should not only be avoided that the material _t from which the tube was made _{r is} overstressed during the compression and that the canal surface becomes rough, but should also be reached? that opposition to
the sliding mass is kept as low as possible. the
Jaws ^ by means of which the tube 1 has the desired profile
are therefore also provided with flowing transitions
and are moved in such a way that there are no sharp transitions anywhere on the tube 1,

The bore 5 is preferably longer than the total length of the
Tube 1 _P so that it is held over its full length
and provided with a profile Austrittssone 7 »which is preferably not more than one third of the total length of the tube 1 constitutes _t not from the bore 5 protrudes.

In the case of thin-armed profiles, the really original length of the profile of the outlet zone 7 can be long in relation to the diameter of the htill circle. In this case the corners 3 of the profile cross-section lie on a circle whose diameter is smaller than

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that of the originally circular cross-section k of the tube 1 «The bore 5 in the spinneret is stepped in this case so that the corners 3 rest against the bore wall in such a way that their cross-section corresponds to an enveloping circle with a correspondingly smaller diameter,

Palis a thread with acute-angled profile edges is to be produced j the tube "must be squeezed at an acute angle. This can lead to material overstressing and breakage of the tube _? And difficulties can arise with regard to the gradual transition from the uncompressed and compressed cross-section To obtain profile _{edges B} the bore 5 below the exit zone 7 can have a narrowing with a smaller inner diameter, so that the rounded edges 3 of the ProfHarms are exactly covered and sharply separated. The resistance exerted by the short stretches of the ring _E lying on the edges of the rounded PfOfils is eliminated by the fastening means, kit that the ring is fastened in the bore 5. It should be pointed out that the ring is firmly attached to the point 9 must concern, dam it does not shift or other disturbances occur «

In another embodiment of the invention, no use is made used in the form of a tube 1 fitted in a bore 5 » but the spinneret is provided with a spinning channel that now meets all the requirements and within one

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koaehslslen tube is arranged ^ which protrudes from the lower end of the spinneret. This protruding tube has a cross-section like the cross-section shown in Fig. I and has the same cross-section. Way on the one shown in Pig »3 or one end» if-en © tabular aäer rod-shaped! .- profile compressed «,

This tube has, isfcenfalls a flowing transition from kreisföi-Tiiigen to Prof !! cross section »The projecting tube is uingeben from one provided with olmir Bohrimg body _t wherein the PchFung at the corners 3 is applied, the body may be secured to the spinneret, in general, a removable RiJRg is used for this body "This spinning nozzle formation, however, the N" chteil _f that the spinneret must be made entirely of a high quality material and that it _r if the spin channel is damaged - versfcopft removed and repaired or the damaged spinning duct must be changed until the spinneret is replaced, inserts cannot be replaced, since none are available, eel? the protruding tube as such is detachably attached to the spinneret and exchangeable at the uncompressed zone,

It should be pointed out that under certain circumstances the forces acting on the profile zone of the protruding tube are so small. that this, since it is a part of the spinneret or is attached to it, is held by the spinneret and thereby sufficient Maintains rigidity so that the profile does not expand into a circle again, which makes it unnecessary to attach a retaining ring » However, if the profile cross-section is to have acute angles, then nmS the ring has been used and can be attached to its lower side with a

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Narrowing, so ds3 a cross-section of the facia with pointed Angles is obtained *

Claims

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Claims (1)

Claim l _a ) Spinneret ζην Production of a profile having threads from plastic compound *! ,, whereby the spinneret has at least one spinning channel »characterized in that the wall of the spinning channel provided with a profile 11 is toasted from a thin-walled tube (1) * whose exit zone ( 7) has a profile inside and outside, 2o) spinneret according to claim l _t characterized * that the outlet zone (7) of the thin-walled tube rests against the wall of a bore (5) only with the edges (3) of the profile. 3.) spinneret according to claim I or 2, characterized _s that the wall of the spinning duct is composed of a thin-walled tube (1) sitting in a bore (5) of a spinneret (6) and over part of its length throughout with its circumferential surface rests on the wall of the bore (5), while the outlet zone (7) of the tube (1) rests only with the edges (3) of the profile on the wall of the bore (5) 4.) The spinneret of claim 2 or 3, characterized in that _"t that the bore, the edges (3) supported the profile check, is in a body, such as buckets ring is ferbunden with the spinning & iis® W $ '· 109816/2008 ^ ⁰ original 1661) 169 5 x) spinneret according to claim 1 * characterized in that the actual extent and the wall thickness of a profile having Austrittssone (7) of Röhrchena (1) is practically equal to the circumference bzwc dei ¹ wall thickness of the zone of the tube (1) »which no Has profile « 6.) spinneret according to claim 1 ;, characterized in that the Austritfcszone (7) of the tube (1) is tapered on the outside. 7o) spinneret according to claim 2 for the production of threads with acute-angled profile edges ,, characterized in that below the exit zone (7) the bore (5) with a narrowed passage is provided, the diameter of which is smaller is than that of the enveloping circle (^) of the profile cross-section of the spinning channel. 8.) Spinneret according to claim 4 · and 7 »characterized in that the narrowed passage within the spinneret bore (5) is attached. 9o) spinneret according to claim 1, characterized shows that the outlet zone (7) of the tube (1) has a helical profile. 109816/2008 10ο) Process for the production of a profile close Spiroikarails for eliio spinneret according to one of the above? * Amsp ^ üche, characterized in that titeö öüraiwaR & ige tube (1) with the profile to be provided with the ^j -n Τ · .ΐ (1θ Ih a special tool is brought, the one plurality of Kiemmbnoken aiifweist ,, with very great precision are exactly radially movable _f and that the Innentsand of the tube is brought (1) of atißsn and without further support by means of the clamping jaws in the form of " 11 «} method according to claim 10 ₁ thereby identified Show the lower end of the tube (1) before attachment of the profile is tapered from the outside. 109816/2008 Blank page