EP2071067A1 - Heat setting container and heat setting method - Google Patents

Abstract

The container has a heating device supplying ambient air heated to a predetermined temperature for a heat setting-process. A control device controls a container inner temperature by supplying the heated ambient temperature in the container in such a manner that the inner temperature lies constant around a predetermined temperature difference above a treating temperature for a yarn. Winding rods guide the yarn through the container with a predetermined transport speed in a continuous operation. An independent claim is also included for a method for heat setting of a yarn.

Description

The technical field of the invention relates to the heat setting of a yarn, such as a thread or a bundle of a plurality of threads, in particular of yarns of natural and / or synthetic materials. Heatsetting is used in particular to improve yarn quality after spinning or twisting textile yarns.

In accordance with the present invention, heatsetting refers to the thermal process that occurs in a vapor, hot, or dry heat to provide dimensional stability or other desirable properties to the fibers, yarns, or fabrics produced. to give greater volume, resistance to wrinkles and increased temperature resistance.

Furthermore, all processes with which a textile material, such as a thread or a bundle of fibers, at least one of the aforementioned properties is imparted by means of temperature and / or moisture, are referred to as heatsetting, heatset or set processes.

At the filing date of the present application, a description of the heatsetting is available at the web site http://en.wikipedia.org/wiki/Heatsetting.

Furthermore, conventional heatsetting processes and heatsetting systems are out of the US 4,513,514 A and from the DE 44 15 229 A1 known. The conventional heatsetting processes are based on the use of superheated steam to heat-treat the yarn in the heatsetting vessel and in the treatment chamber, respectively.

The use of superheated steam in heatsetting, despite the necessary provisioning costs for the superheated steam of the textile industry a variety of high quality and reproducible products secured over many decades.

An object of the present invention, however, is to propose a more cost effective way of heat setting yarns.

According to the invention the object is achieved by a Heatsetting container with the features of claim 1 and / or by a method for Heatsetting with the features of claim 7.

The core of the present invention is to use in the Heatsetting or Heatsetting process of one or more yarns not previously used exclusively superheated steam, but heated ambient air.

The ambient air of Heatsetting container is heated by a heater, heater or the like to a predeterminable elevated temperature to provide the superheated ambient air without a dedicated supply of water vapor or heated water.

Applicant has made a number of experiments to this end, which confirm that heated ambient air heatersetting without water vapor provides high quality, reproducible products in a variety of yarns. Even the product properties of yarns treated with the heat setting according to the present invention and those treated with the more conventional more expensive heat setting are substantially identical for many yarn types. In addition shows Fig. 1 a tT diagram showing the Heatsetting invention with hot air over a Heatsetting with water vapor.

The x-axis of the tT diagram after FIG. 1 shows the time t in seconds and the y-axis shows the yarn temperature T in degrees Celsius. In the tT diagram, a first curve K1 describes the heat setting with water vapor and a second curve K2 the hot air setting according to the invention. From a time t1 (for example t1 = 10s at slightly below 100 ° C), the second curve K2 exceeds the first curve K1. Consequently, the hot air setting according to the invention after the curve K2 provides an increased heatsetting temperature or yarn temperature from the time t1 to the conventional heatsetting with water vapor after the curve K1. Consequently, the second curve K2 reaches the necessary treatment temperature for treating the yarn of, for example, 170 ° C earlier than the first curve K1.

A very good example of such a yarn is polypropylene (PP) yarn, since polypropylene does not absorb moisture and therefore water due to its material properties. Thus, in terms of the properties of the treated polypropylene yarn according to Applicants' experiments, it is essentially irrelevant whether the polypropylene yarn is treated by means of the heat setting according to the invention or by means of the conventional heat setting. A significant advantage of Heatsettings invention with the superheated ambient air instead of the superheated steam is, however, in the reduction of costs, since according to the present invention, the cost of providing the superheated steam eliminated.

According to the invention, a Heatsetting container is proposed according to the sweet principle, which is suitable for treating a yarn by means of a Heatsetting process, and at least comprising means adapted to provide an ambient air heated to a predetermined temperature for the heatsetting process.

An advantage of the Heatsetting container according to the invention over the known Heatsetting containers is in particular that can be dispensed with all means for providing the superheated steam. Thus, the Heatsetting container according to the invention is less complex and therefore less expensive.

1. a) Bereitstellen eines Heatsetting-Behälters nach dem Süssen-Prinzip, welcher dazu geeignet ist, das Garn mittels eines Heatsetting-Prozesses, insbesondere in einem kontinuierlichen Betrieb, zu behandeln;
2. b) Erhitzen der Umgebungsluft des Heatsetting-Behälters auf eine vorbestimmte Temperatur zur Bereitstellung erhitzter Umgebungsluft; und
3. c) Durchführen des Heatsetting-Prozesses mittels der bereitgestellten erhitzten Umgebungsluft.

Furthermore, the invention proposes a method for heat setting a yarn, which comprises the following steps:

1. a) providing a Heatsetting container according to the sweetness principle, which is suitable for treating the yarn by means of a Heatsetting process, in particular in a continuous operation;
2. b) heating the ambient air of the heatsetting vessel to a predetermined temperature to provide heated ambient air; and
3. c) performing the Heatsetting process by means of the provided heated ambient air.

A particular advantage of the method according to the invention is in addition to the use of heated ambient air for Heatsetting process instead of superheated steam in that the inventive method for Heatsetting a yarn itself with conventional Heatsetting containers or treatment chambers, for example, in the DE 39 38 183 C2 , in the US 4,513,514 A or in the DE 44 15 229 A1 are described, is feasible. Further, by means of this, the conventional Heatsetting container or treatment chambers due to the invention possible waiver of the costly superheated steam cheaper to operate. This results in a wide field of application for the method according to the invention.

Advantageous embodiments and modifications of the invention will become apparent from the dependent claims and the description with reference to the drawings.

According to a preferred embodiment of the invention, the means comprises a heating device. The heater is configured to heat an ambient air of the heatsetting vessel to the predetermined temperature and to provide or supply the heated ambient air to the heatsetting process.

According to a preferred embodiment of the invention, the yarn has at least one plastic fiber. Alternatively, the yarn may also be formed as a plastic fiber. The plastic fiber is formed, for example, from one or more of the following: polypropylene (PP), polyamide 6 (PA 6), polyamide 6.6 (PA 6.6), polyamide 12 (PA 12), polyester, polyethersulfone (PES), polyethylene terephthalate (PET) , Polybutylene terephthalate (PBT), acrylic or polyacrylonitrile (PAN).

According to a further preferred development, a control device is provided. The control device is adapted to control a container internal temperature in the interior of the Heatsetting container by means of a supply of heated ambient air in the Heatsetting container such that the container interior temperature substantially constant by a predetermined temperature difference, for example 10 ° C, above a treatment temperature for the Yarn is lying.

The tank internal temperature is in the chamber temperature in the DE 44 15 229 A1 Are defined. In this document of the prior art, the treatment temperature is further defined.

According to a further preferred development means are provided, which are adapted to pass the yarn through the Heatsetting container at a predetermined transport speed in a continuous operation. These means are designed for example as a transport device and may in particular include a winding mast or a mast transport system.

Fig. 1

ein t-T-Diagramm zur Darstellung des erfindungsgemäßen Heatsetting mit Heißluft gegenüber eines Heatsetting mit Wasserdampf;

Fig. 2

ein schematisches Blockschaltbild eines Ausführungsbeispiels des erfindungsgemäßen Heatsetting-Behälters; und

Fig. 3

ein schematisches Ablaufdiagramm eines Ausführungsbeispiels des erfindungsgemäßen Verfahrens zum Heatsetting.

The invention will be explained in more detail with reference to the exemplary embodiments indicated in the schematic figures. Show it:

Fig. 1

a tT diagram showing the Heatsetting invention with hot air against a Heatsetting with water vapor;

Fig. 2

a schematic block diagram of an embodiment of the Heatsetting container according to the invention; and

Fig. 3

a schematic flow diagram of an embodiment of the method according to the invention for Heatsetting.

In Fig. 2 Fig. 3 is a schematic block diagram of a heatsetting vessel 1 according to the present invention. The Heatsetting container 1 is based on the sweetness principle. A Description of the sweetness principle is available at the filing date of the present application under the web page http://de.wikipedia.org/wiki/Heatsetting.

The Heatsetting container 1 according to the sweetness principle is adapted to treat a yarn 2 by means of a Heatsetting process. For transporting the yarn 2 through the heatsetting container 1, for example, a winding mast 4 is provided, on which the yarn 2 is deposited, for example, in loops. In particular, the winding mast 4 is suitable for carrying out the yarn 2 stored in loops along the transport path through the heatsetting container 1 at a predeterminable transport speed. Furthermore, the heatsetting container 1 is preferably suitable for continuous operation.

Furthermore, the heatsetting container 1 has a means 3 which is suitable for providing an ambient air eL heated to a predetermined temperature for the heatsetting process.

The means 3 in particular has a heating device which is adapted to heat an ambient air L of the Heatsetting container 1 to the predetermined temperature and to provide or supply the heated ambient air eL to the Heatsetting process.

The yarn 2 is for example formed as a plastic fiber or has at least one plastic fiber.

Furthermore, the Heatsetting container 1 may also have an inlet device 6 and an outlet device 7, which serve in particular for improved sealing of the Heatsetting container 1 in its longitudinal direction at the points to where the winding mast 4 or several winding masts 4 are guided and led out.

Furthermore, the heatsetting container 1 preferably also has a control device 5. The control device 5 is adapted to control a container internal temperature inside the Heatsetting container 1 by means of a supply of the heated ambient air eL of the heater 3 in the Heatsetting container 1 such that the container interior temperature substantially constant by a predetermined temperature difference above a treatment temperature for the yarn 2 is located. The treatment temperature is for example 170 ° C. The predetermined temperature difference is in the interval between 10 ° C and 20 ° C, preferably between 10 ° C and 17 ° C, more preferably between 10 ° C and 12 ° C. The control device 5 controls the heating device 3, for example, with a control signal S.

Fig. 3 shows an embodiment of the method according to the invention for Heatsetting a yarn 2. Hereinafter, the inventive method based on the block diagram in Fig. 3 regarding Fig. 2 explained. The inventive method according to Fig. 3 has the following method steps a to c.

Process step a:

A Heatsetting container 1 according to the sweetness principle is provided, which is suitable for treating the yarn 2 by means of a heat setting process, in particular in a continuous operation. Examples of such a Heatsetting container 1 can be found in the DE 39 38 183 C2 , in the US 4,513,514 or in the DE 44 15 229 A1 , A preferred one Embodiment of such a Heatsetting container 1 results from Fig. 2 of the present application.

Process step b:

The ambient air L of the heatsetting tank 1 is heated to a predetermined temperature to provide heated ambient air eL.

Process step c:

The Heatsetting process is performed by means of the provided heated ambient air eL. In this case, the heated ambient air eL is used to set the container internal temperature in the interior of the Heatsetting container 1 constant to a predetermined temperature, which by a pre-definable temperature difference, e.g. 10 ° C, above the treatment temperature for the yarn 2.

Although the present invention has been described above with reference to the preferred embodiments, it is not limited thereto, but modified in many ways. For example, it is conceivable that the control device described additionally controls the transport speed as a function of the actual container interior temperature and thus regulates the transport speed of the yarn through the Heatsetting container and the supply of heated ambient air. This results in a further degree of freedom for the Heatsetting of the yarn.

Furthermore, it is also conceivable to arrange a filter device for filtering the heated ambient air between the heating device and the Heatsetting container.

LIST OF REFERENCE NUMBERS

1

Heat Setting container

2

yarn

3

heater

4

Transport device, e.g. central mast

5

control device

6

inlet device

7

outlet device

eL

Heated ambient air

L

ambient air

K1

first turn

K2

second bend

S

control signal

t

time in seconds

t1

time

T

Temperature in ° C

Claims (7)

Heatsetting container (1) according to the sweetness principle, which is adapted to treat a yarn (2) by means of a Heatsetting process, and at least one means (3) which is adapted to a heated to a predetermined temperature Provide ambient air (eL) for the heatsetting process. Heatsetting container according to claim 1,
characterized,
that the means (3) has a heating device which is adapted to an ambient air (L) of the Heatsetting container (1) to be heated to the predetermined temperature and the heated ambient air (El) supplied to the Heatsetting process. Heatsetting container according to claim 1 or 2,
characterized,
that the yarn (2) at least one plastic fiber, or is formed as a plastic fiber. Heatsetting container according to claim 3,
characterized,
in that the plastic fiber (2) is formed from one or more of the following materials: polypropylene, polyamide 6, polyamide 6.6, polyamide 12, polyester, polyethersulfone, polyethylene terephthalate, polybutylene terephthalate, acrylic, polyacrylonitrile. Heatsetting container according to claim 1 or one of claims 2 to 4,
characterized,
in that a regulating device (5) is provided, which is set up to control the container internal temperature in the interior of the heatsetting container (1) by supplying the heated ambient air into the heatsetting container (1) in such a way that the container internal temperature is substantially constant a predetermined temperature difference is above a treatment temperature for the yarn (2). Heatsetting container according to claim 1 or any one of claims 2 to 5,
characterized,
in that a means (4) is provided which is adapted to pass the yarn (2) through the heat setting container (1) at a predeterminable transport speed in a continuous operation. Method for heat setting a yarn (2), comprising the steps of: a) providing a Heatsetting container (1) according to the sweetness principle, which is adapted to treat the yarn (2) by means of a Heatsetting process, in particular in a continuous operation; b) heating the ambient air (L) of the Heatsetting container (1) to a predeterminable temperature for providing heated ambient air (eL); and c) performing the heatsetting process by means of the provided heated ambient air (eL).

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