DE202018104700U1 - Knitting needle for knitting machines - Google Patents

Abstract

Knitting needle for knitting machines, characterized in that it comprises a needle body of the knitting needle and located on the surface of the needle body ta-C.

Description

Domain of utility model

The present utility model relates to the textile sector, the textile machine sector and the field of coating, in particular to a knitting needle for knitting machines, the surface of which is coated with ta-C using the FCVA technique, around a ta-C coated knitting needle to get for knitting machines.

Technical background

The knitting needle for knitting machines has a steel needle body, which has a hardness of 504 HV to 645 HV and is very susceptible to wear. To increase the abrasion resistance of a knitting needle, it is currently common worldwide to produce by hard chrome plating a hard chrome protective layer on the surface of the steel needle. Thanks to its high hardness of 800 HV and its low coefficient of friction of 0.7-1.0, the hard chrome can improve the abrasion resistance of a knitting needle under operating conditions.

With the constant increase in environmental awareness among governments of various countries, industry and ordinary people, there is a gradual recognition of the potential environmental hazard of surface treatment of a knitting needle by means of hard chrome plating.

Both in the process of surface treatment of the knitting needle by the hard chrome plating as well as in the hard chrome protective layer produced by the chromium plating on the surface of the knitting needle there is a risk of a chromium load. In the later weaving process, chromium may diffuse into the tissue in minimal quantities, which would threaten human health.

In the case of hard chrome plating, moreover, the coating thickness can not be controlled well enough, which easily leads to an uneven layer thickness, thereby impairing the accuracy of the respective knitting needle.

In addition, because of the limitations of hard chrome plating with respect to hardness and friction coefficient, only knitting needles can be made whose properties do not meet the requirements. This limits the increase in the properties of a knitting machine, so that only a balance between the increase in speed and the reduction of wear and the frictional heat generation on knitting needles can be sought in order to maintain normal operation and adequate life of the machine without the operating speed and production capacity of the knitting machine can be increased. In other words, the speed can technically be increased in a simple manner. With the speed increase, however, high wear and a frictional heat generation on knitting needles, which affects the thermal expansion of the respective knitting needle and therefore can lead to instability, connected, which has not yet been solved. Thus, there is an urgent need to increase the hardness and reduce the coefficient of friction.

Revelation of the utility model

Starting from the above-described prior art concerning the characteristics of the knitting needles for knitting machines and the technique for surface treatment, the present utility model provides a knitting needle for knitting machines whose surface is coated with ta-C using the FCVA technique to obtain the knitting needle previously known hard chromed knitting needles to replace.

According to the present utility model, this object is achieved by the following embodiments:

The present utility model proposes a knitting needle for knitting machines comprising a needle body of the knitting needle and a ta-C located on the surface of the needle body.

It is preferably provided that the ta-C has a hardness of 2500-5000 HV.

It is preferably provided that the ta-C has a coefficient of friction of 0.08-0.1.

It is preferably provided that the ta-C has a thickness of 0.5-2 microns.

It is preferably provided that the ta-C is deposited by FCVA on the surface of the knitting needle.

It is preferably provided that the knitting needle is a knitting needle of at least one of the knitting machines warp knitting machine, circular knitting machine, sock knitting machine and flat knitting machine, the types of knitting needle comprising a yarn guide needle, a needle core, a board, a grooving needle.

1. a. Im Vergleich zur Hartverchromung, die eine Härte von 800 HV und einen Reibungskoeffizienten von 0,7-1,0 bietet, besitzt das bei dem vorliegenden Gebrauchsmuster eingesetzte ta-C eine Härte von 2500-5000 HV und einen Reibungskoeffizienten von 0,08-0,1, was der jeweiligen Stricknadel eine sehr hohe Verschleißfestigkeit verleiht.
2. b. Mit dem sehr geringen Reibungskoeffizienten von ta-C wird der Reibungswiderstand zwischen der Stricknadel und dem Faden verringert, was gleichmäßigere Fadenschleifen, einen reibungsloseren Flechtvorgang und eine glattere Gewebeoberfläche ermöglicht.
3. c. Das ta-C ist im Wesentlichen durch einen Kohlenstofffilm gebildet, der sich in vertikaler Richtung wärmeisolierend und in horizontaler Richtung wärmeleitend auswirkt. Beim Betrieb der Stricknadel wird die durch die Reibung mit dem Gewebe entstehende Wärme zu großem Teil von dem Gewebe abgeführt und somit die durch diese Wärme herbeigeführte Ausdehnung der Stricknadel vermindert.
4. d. Das ta-C besteht hauptsächlich aus Kohlenstoff, der eine hervorragende Säurebeständigkeit aufweist, wodurch die Korrosionsbeständigkeit der Stricknadel verbessert und eine Korrosion der Stricknadel durch manche säure Chemiefasern wirksam vermieden wird.

The production of ta-C on the surface of a knitting needle according to the present utility model as a substitute for the ordinary Hard chrome plating as a surface treatment offers the following advantages:

1. a. Compared to hard chrome plating, which has a hardness of 800 HV and a friction coefficient of 0.7-1.0, the ta-C used in the present invention has a hardness of 2500-5000 HV and a friction coefficient of 0.08-0 , 1, which gives the respective knitting needle a very high resistance to wear.
2. b. With the very low coefficient of friction of ta-C, the frictional resistance between the knitting needle and the thread is reduced, which allows more uniform thread grinding, a smoother braiding process and a smoother fabric surface.
3. c. The ta-C is essentially formed by a carbon film which has a heat-insulating effect in the vertical direction and a heat-conducting effect in the horizontal direction. During operation of the knitting needle, the heat generated by the friction with the tissue is largely dissipated by the tissue and thus reduces the expansion of the knitting needle caused by this heat.
4. d. The ta-C is mainly composed of carbon which has excellent acid resistance, thereby improving the corrosion resistance of the knitting needle and effectively preventing corrosion of the knitting needle by some acidic manmade fibers.

1. 1. Mit dem vorliegenden Gebrauchsmuster wird das Problem der Chrombelastung während der Hartverchromung der Oberfläche einer Stricknadel gelöst, indem durch die FCVA-Technik an der Oberfläche einer Stricknadel aus Stahl eine ta-C-Schutzschicht erzeugt wird.
2. 2. Das gemäß dem vorliegenden Gebrauchsmuster eingesetzte ta-C ist vollkommen chromfrei, was eine mögliche Chrombelastung in dem Flechtvorgang mit der Stricknadel ausschließt.
3. 3. Mit dem bei dem vorliegenden Gebrauchsmuster verwendeten FCVA-Verfahren kann die Dicke des an der Stricknadel befindlichen ta-C exakt gesteuert werden, was zur Erhöhung der Genauigkeit der Stricknadel beitragen kann.
4. 4. Mit dem gemäß dem vorliegenden Gebrauchsmuster eingesetzten ta-C werden eine erhebliche Erhöhung der Oberflächenhärte der Stricknadel (2500-5000 HV) und eine deutliche Reduzierung des Reibungskoeffizienten (0,08-0,1) erzielt, um Voraussetzungen für die Entwicklung von Strickmaschinen mit erhöhter Geschwindigkeit zu schaffen.

Compared with the prior art, the present utility model offers the following advantageous effects:

1. 1. The present utility model solves the problem of chromium loading during hard chrome plating of the surface of a knitting needle by producing a ta-C protective layer on the surface of a steel knitting needle by the FCVA technique.
2. 2. The ta-C used according to the present invention is completely free of chromium, which excludes a possible chromium loading in the knitting needle weaving process.
3. 3. With the FCVA method used in the present invention, the thickness of the ta-C located on the knitting needle can be accurately controlled, which can contribute to the increase in the accuracy of the knitting needle.
4. 4. With the ta-C used according to the present invention, a significant increase in the surface hardness of the knitting needle (2500-5000 HV) and a significant reduction in the coefficient of friction (0.08-0.1) are achieved to conditions for the development of knitting machines to create with increased speed.

Concrete embodiments

In the following, the present utility model will be explained in more detail with reference to concrete exemplary embodiments. For the expert in the field, the following embodiments serve for a better understanding of the present utility model, without limiting the present utility model. It will be apparent to those of ordinary skill in the art that variations and improvements can be made within the scope of this utility model which are within the scope of this utility model.

First embodiment

1. A. Aufstellen des Nadelkörpers der Fadenführungsnadel;
2. B. Beschichten der Oberfläche der Stricknadel mit ta-C durch die FCVA-Technik, um die vorgenannte Fadenführungsnadel zu erhalten.

In particular, the present embodiment is a yarn feeding needle for knitting machines comprising a needle body of the yarn guide needle and a ta-C located on the surface of the needle body. The production of such a yarn guide needle for knitting machines comprises the following steps:

1. A. setting up the needle body of the thread guide needle;
2. B. coating the surface of the knitting needle with ta-C by the FCVA technique to obtain the aforementioned yarn guide needle.

The yarn guide needle produced in the present embodiment has a hardness of ta-C of 2500-5000 HV, a friction coefficient of 0.08-0.1 and a thickness of 0.5-2 microns.

Second embodiment

1. A. Aufstellen des Nadelkörpers des Nadelkerns;
2. B. Beschichten der Oberfläche der Stricknadel mit ta-C durch die FCVA-Technik, um den vorgenannten Nadelkern für Strickmaschinen zu erhalten.

Specifically, the present embodiment is a knitting needle core comprising a needle body of the needle core and a ta-C located on the surface of the needle body. The manufacture of such a needle core for knitting machines comprises the following steps:

1. A. setting up the needle body of the needle core;
2. B. Coating the surface of the knitting needle with ta-C by the FCVA technique to obtain the aforementioned needle core for knitting machines.

The needle core produced in the present embodiment has a hardness of ta-C of 2500-5000 HV, a friction coefficient of 0.08-0.1 and a thickness of 0.5-2 microns.

Third embodiment

1. A. Aufstellen des Nadelkörpers der Platine;
2. B. Beschichten der Oberfläche der Stricknadel mit ta-C durch die FCVA-Technik, um die vorgenannte Platine für Strickmaschinen zu erhalten.

Specifically, the present embodiment is a board for knitting machines comprising a needle body of the board and a ta-C located on the surface of the needle body. The production of such a board for knitting machines comprises the following steps:

1. A. Setting up the needle body of the board;
2. B. coating the surface of the knitting needle with ta-C by the FCVA technique to obtain the aforementioned knitting machine board.

The board produced in the present embodiment has a hardness of ta-C of 2500-5000 HV, a coefficient of friction of 0.08-0.1 and a thickness of 0.5-2 microns.

Fourth embodiment

1. A. Aufstellen des Nadelkörpers der Nutnadel;
2. B. Beschichten der Oberfläche der Stricknadel mit ta-C durch die FCVA-Technik, um die vorgenannte Nutnadel für Strickmaschinen zu erhalten.

In particular, the present embodiment is a grooving needle for knitting machines comprising a needle body of the grooving needle and a ta-C located on the surface of the needle body. The production of such a groove needle for knitting machines comprises the following steps:

1. A. setting up the needle body of the grooving needle;
2. B. Coating the surface of the knitting needle with ta-C by the FCVA technique to obtain the aforementioned grooving needle for knitting machines.

The grooving needle produced in the present embodiment has a hardness of ta-C of 2500-5000 HV, a friction coefficient of 0.08-0.1 and a thickness of 0.5-2 microns.

First comparative example

1. A. Aufstellen des Nadelkörpers der Fadenführungsnadel;
2. B. Abscheiden von Chromatomen an der Oberfläche des Nadelkörpers mit einem stromlosen Abscheidungsverfahren, um die vorgenannte Fadenführungsnadel zu erhalten.

The present comparative example provides a yarn guide needle for knitting machines which comprises a needle body of the thread guide needle and a hard chrome layer on the surface of the needle body and is manufactured by the following steps:

1. A. setting up the needle body of the thread guide needle;
2. B. deposition of chromium atoms on the surface of the needle body with an electroless plating process to obtain the aforementioned yarn guide needle.

The yarn guide needle produced in the present embodiment has hardness of the hard chrome of 800 HV, a friction coefficient of 0.7-1.0 and a thickness of 4-8 micrometers.

In summary, in the present utility model using the FCVA technique, the surface of various knitting needles for knitting machines is coated with Ta-C to provide very high hardness, very low friction coefficient, high wear resistance and corrosion resistance, and to keep the individual properties stable

The above describes only preferred embodiments of the present utility model, which is suitable for many applications. It should be noted that the above embodiments do not limit the scope of the present utility model, but merely serve to explain the present utility model. It will be apparent to one of ordinary skill in the art that improvements can be made in the present utility model that are included within the scope of this utility model.

Claims (6)

Knitting needle for knitting machines, characterized in that it comprises a needle body of the knitting needle and located on the surface of the needle body ta-C. Knitting needle for knitting after Claim 1 , characterized in that the ta-C has a hardness of 2500-5000 HV. Knitting needle for knitting after Claim 1 , characterized in that the ta-C has a coefficient of friction of 0.08-0.1. Knitting needle for knitting after Claim 1 , characterized in that the ta-C has a thickness of 0.5-2 microns. Knitting needle for knitting after Claim 1 , characterized in that the ta-C is deposited by FCVA on the surface of the knitting needle. Knitting needle for knitting after Claim 1 , characterized in that the knitting needle is a knitting needle of at least one of the knitting machines warp knitting machine, circular knitting machine, sock knitting machine and flat knitting machine, the types of knitting needle Knitting needle include a yarn guide needle, a needle core, a board, a grooved needle.