CN-121992514-A - Melt spinning apparatus for extruding filaments

Abstract

The invention relates to a melt-spinning device for extruding filaments, in particular made of polyamide which releases monomers and/or oligomeric compounds (70) during extrusion, having a spinning beam (2) for extruding filaments (F) into an extrusion zone (5) of the extruded filaments, and having a cooling drum (4) for cooling the filaments (F), which adjoins the extrusion zone (5), having a degassing device (6) with a coupling section (62) being positioned in the extrusion zone (5), having a heating device (8) for heating the monomers and oligomeric compounds above their condensation temperature (KT) and being in fluid-tight contact with the cooling drum, such that a passive gas flow (72) can be conducted from the cooling drum towards the degassing device (60) and into the degassing device (60), and also to a degassing device (6) for collecting monomers and/or oligomeric compounds (70).

Inventors

• M. FISHER
• R. Nichik
• M-A. Helndov
• M. Pruckbaum

Assignees

• 欧瑞康纺织有限及两合公司

Dates

Publication Date

20260508

Application Date

20251105

Priority Date

20241108

Claims (9)

1. 1. Melt spinning apparatus (1) for extruding filaments (F), in particular made of polyamide, which releases monomers and/or oligomeric compounds (70) during extrusion, the melt spinning apparatus (1) having a spinning beam (2) for extruding filaments (F) into an extrusion zone (5) into which the filaments are extruded, and a cooling drum (4) for cooling the filaments (F), which cooling drum adjoins the extrusion zone (5), wherein a degassing device (6) with a coupling section (62) is positioned on the extrusion zone (5), wherein the degassing device (6) has a heating device (8) for heating monomers and oligomeric compounds above their condensation temperature (KT), and the degassing device (6) is in fluid-tight contact with the cooling drum such that a passive gas flow (72) can be guided from the cooling drum (4) towards the degassing device (60) and into the degassing device (60).
2. 2. Melt spinning apparatus according to claim 1, characterized in that the cooling drum (4) has an inlet (43), a ventilation air grid (41) and an outlet (44), the inlet (43) being used for feeding the filaments (F), the ventilation air grid (41) adjoining the inlet (43) and being directed transversely to a filament travel direction (FR) and in a transversely extending direction (ER) of the cooling drum (43) an active air flow (71), the outlet (44) being arranged opposite the inlet (43), wherein at the inlet (43) the passive air flow (72) can be fed, the passive air flow (72) pointing in a direction opposite to the filament travel direction (FR) of the filaments (F) and being formed by the active air flow (71).
3. 3. Melt spinning apparatus according to at least one of the preceding claims 1 and 2, wherein the inlet (43) has an inlet funnel (40), the inlet funnel (40) defining a deposition inner surface (401) and a gas flow deflection surface (402), the gas flow deflection surface (402) being for guiding the passive gas flow (72) towards the extrusion zone (5).
4. 4. The melt spinning apparatus according to at least one of the preceding claims, wherein the outlet (44) has an outlet cylinder (42) with an air-impermeable wall, wherein the outlet cylinder (44) is surrounded by an air supply duct (48), by means of which air supply duct (48) the active air flow (72) can be guided towards the inlet (43) by means of an air duct (46) surrounding the cooling cylinder (4).
5. 5. Melt spinning apparatus according to at least one of the preceding claims, wherein the active gas flow (72) is generated by means of a gas flow conveying device arranged in a spaced-apart manner from the outlet (44), wherein the active gas flow (72) is distributed via the gas supply duct (48) towards the gas duct (46), wherein the gas duct (46) directs the active gas flow (71) to the cooling drum (4) and the passive gas flow (72) towards the inlet (43).
6. 6. Degassing device (6) for collecting monomer and/or oligomer compounds (70) produced during extrusion of filaments made of polyamide by a melt spinning apparatus according to at least one of the preceding claims 1 to 5, wherein the degassing device (6) has a degassing chamber (60) and a coupling section (62), the degassing chamber (60) having a collecting section (61) for collecting the monomer and oligomer compounds, the coupling section (62) being used for fluid-tight coupling of the degassing device (6) to an extrusion zone of a spinning beam (2), wherein the coupling section (62) has heating means for heating such that the monomer and/or oligomer compounds can be provided in the coupling section (62) above their condensation temperature.
7. 7. Degassing device (6) according to claim 6, wherein the heating device (81) has a sensor (31), the sensor (31) being for sensing a heating temperature of the heating device (81), wherein the temperature sensed by the sensor (31) is sent to a controller (3) of the melt spinning apparatus (1) by means of signal communication, whereby a predetermined temperature of the heating device (81) can be adjusted by means of the controller (3) based on a sensor signal from the sensor (31).
8. 8. The degassing device (6) according to at least one of the preceding claims 6 and 7, wherein the heating device (81) has a heating cable (80) coupled to a power supply (30).
9. 9. The degassing device (6) according to at least one of the preceding claims 6 to 8, wherein the power supply (30) is coupled to a controller of the melt spinning apparatus (1).

Description

Melt spinning apparatus for extruding filaments Technical Field The present invention relates to a melt spinning apparatus for extruding filaments, in particular filaments made of polyamides which generate monomeric and/or oligomeric compounds during extrusion, and an associated degassing device for collecting the monomeric and/or oligomeric compounds. Background It is well known that in nylon (PA) spinning processes, monomers are produced as byproducts during extrusion of filaments and can deposit on the internal components of the melt spinning apparatus. Since the monomer solidifies and deposits on the inner walls of the cavity of the monomer suction device at ambient temperature and during extrusion, the deposits must be removed regularly so that they do not negatively affect the quality of the synthetic filaments and the health of the personnel. In the general prior art, the monomer suction apparatus has a steam cleaning apparatus. The steam is intended to prevent monomer from depositing on the internal components of the melt spinning apparatus. In this case, an additional investment in the steam cleaning equipment and an additional part such as a boiler or a steam generator are required. In addition, the vapor may not be sufficiently distributed to all the internal components, and thus the monomer may be deposited there. In order to prevent monomer from depositing on the monomer aspirator, the prior art generally discloses heating the components of the monomer aspiration apparatus. CN209741325U claims a monomer aspirator where the cavity of the monomer aspirator can be heated and the cavity has a separate active aspiration via a fan. However, the feed hopper of the chamber is not provided with heating, which can lead to deposits at the feed hopper and can impair the active effective suction flow. In addition, the active suction flow generated by the fan of the monomer aspirator can negatively impact the newly extruded filaments and negatively impact their quality. This can lead to premature coagulation of the single side due to the suction flow acting on one side of the filament, and this can result in a filament that is less elastic and more prone to breakage. Disclosure of Invention Accordingly, the present invention has been made in an effort to solve the problem of providing a melt spinning apparatus for extruding melt-spun filaments in which deposition of monomers can be prevented without adversely affecting the filaments. The present invention aims to solve the further problem of providing a degassing chamber for monomers which prevents or at least makes more difficult the deposition of monomers in the area where they enter. According to the invention, the problem with a melt spinning apparatus is solved by a melt spinning apparatus having the features described in the first aspect of the invention. According to one aspect of the present invention there is provided a melt spinning apparatus for extruding filaments, in particular filaments made of polyamide which releases monomers and/or oligomeric compounds during extrusion, having a spinning beam for extruding filaments into an extrusion zone of the extruded filaments, and a cooling drum for cooling the filaments, the cooling drum being adjacent to the extrusion zone, wherein a degassing device having a coupling section is positioned on the extrusion zone, wherein the degassing device has heating means for heating the monomers and oligomeric compounds above their condensation temperature and is in fluid-tight contact with the cooling drum such that a passive gas flow can be directed from the cooling drum towards and into the degassing device. With the melt spinning apparatus or with associated degassing means, monomers and/or oligomeric compounds, in particular monomers, can be removed from the extrusion zone of the melt spinning apparatus. In this case, the monomer can be prevented from depositing on the internal parts of the melt spinning apparatus. Monomer deposition in the extrusion zone can lead to poor filament quality. If deposits accumulate excessively, the production process must be interrupted periodically and the affected parts cleaned and/or replaced. Passive airflow is understood to be airflow that is not directly generated by an active actuator that directly cooperates with and is connected to the deaeration device. Passive airflow is generated by active air channeling. In addition, the passive air flow is directed in a direction opposite to the direction of filament travel. If the monomer is not properly removed, the melt spinning apparatus must be maintained and cleaned regularly, wherein, in particular, the deposited monomer must be removed. Production interruptions can negatively impact filament quality. Interruption may mean that the polyamide or the melt cannot be kept at a predetermined temperature, so that either energy has to be consumed for additional heating of the melt and/or the heating means for providing the molten p