DE1660549A1 - Heating device for the heat treatment of yarns, in particular for false twist devices for the treatment of synthetic yarns - Google Patents

Description

Essen, March 20, 1967 (28 397 / Kle / th)

Patent registration of the company '
ERNEST SCRAGG & SONS LIMITED

PO Box No. l6,
Sunderland Street,

Macclesfle ld-Cheshire / England

Heating device for the heat treatment of yarns, in particular for palsch twisting devices for Treatment of synthetic yarn.

Such heating devices for the heat treatment of yarns, in particular for Palsch twist devices for Treatments of synthetic yarns are known in various embodiments. In their basic structure such heating devices consist of a metallic carrier plate made of a material that conducts heat well, mostly copper, with a contact pad made of more wear-resistant material, mostly chrome or hard chrome. In fact, because of this heat conduction, you need the material, which is a good conductor of heat, mostly copper, to which mostly electrical heating coils

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to bring generated heat to the yarn, which is guided in contact over the Zeizvarrichtung and is heated by conduction. The carrier plate must regularly have such a thickness that its heat capacity is relatively large, so that the heat dissipation that arises because the yarn to be treated is passed over the heating device is comparatively small. Materials that conduct heat well, such as copper and the like, however, usually only have low levels. Strength: in particular wear resistance, so that as a result of the heat transfer through contact, signs of wear in the form of undesired grooving and the like appear. Therefore, the contact layer made of more wear-resistant material is common and required, - chrome or hard chrome layers, which are applied to the metal carrier plate, become regular; with the help of chrome plating baths, ie applied electrolytically. The _v edition is therefore not pore-free. That has its drawbacks. On the one hand, considerable shear stresses occur between the metallic carrier plate and the contact pad as a result of different thermal expansion. Under certain circumstances, these shear stresses already lead to a tendency to detach, but in addition, chemical substances with which the yarns to be treated are equipped and which are applied to the contact surface with the yarns also penetrate into the zone stressed by shear stresses via the pores. This mainly concerns the fatty acids contained in the sausage. This leads to premature detachment of the contact pad from the metallic carrier plate, and consequently to premature destruction.

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Not inconsiderable part of the occurring shear stresses and the associated signs of destruction are caused by intermittent heating Heating devices in operation, as for cleaning the contact surface of residues of the yarn and the Turn off these heaters from time to time, so be cooled down. These temperature fluctuations naturally favor the occurrence fluctuating stress at the interface between Carrier plate and contact pad and thus the creation fine cracks in the contact surface through which the Melt to a greater extent up to this interface can penetrate and in this zone veritable electrolytic Corrosion cells arise in which the sludge or the textile oil acts as an electrolyte.

The invention is based on the object of specifying how a heating device of the type described at the outset is to be used is designed so that premature destruction of the heating device as a result of the contact pad becoming detached from the metallic carrier plate no longer occur.

The invention therefore relates to a heating device for the Heat treatment of yarns, in particular for false twist devices for the treatment of synthetic yarns, consisting of a metallic carrier plate made of gut thermally conductive material, in particular copper, and a contact pad made of more wear-resistant material, in particular a chrome edition.

It is characterized in that under-the contact support single-pore-free (or very low-pore) connection

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layer is arranged which
Influences on the part of the oil

; opposite chemical ;. is insensitive.

The coefficient of thermal expansion is expediently this connecting layer between that of the carrier plate and that of the contact pad, whereby the aforementioned Shear stresses at the interfaces between the three

Layers of heating devices; becoming

substantially reduced

According to a special proposal, the connecting layer consists of nickel or a nickel alloy.

V-J

The aforementioned disadvantages, and | especially the Shear stresses at the interface between the carrier plate and the contact edition, jpr ^ ten with the one so far usual structure of such a heating device especially in the case of formations grooved longitudinally in the direction of the grain as they are generally customary. This is due in particular to the fact that the plates grooved in this way different thermal expansion of the two plate layers especially in these grooves to particularly strong tensions can lead · Surprisingly, however, these Disadvantages also with grooved plates due to the invention avoid properly · j

A more detailed explanation of the invention emerges from

the following description

based on the accompanying drawing; show it;

FIG. 1 is a plan view of a heating device according to the invention; and

FIG. 2 shows a section through FIG

ian exemplary embodiment

1 along the line A-A,

ORIGINAL INSPECTED

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The heating device according to the invention, i.e. in particular by heating coils, not shown, from below (Fig. 2) heatable heating plate H consists of a strip-shaped, 5 - 6.5 mm thick for even heating copper carrier plate 1, on which a nickel or Nickel alloy pad 2 is applied, which in turn is provided with a hard earring 3. The carrier plate 1. and thus also the outer contact pad 3 points to flawless guidance of the yarns to be treated two longitudinal grooves / on.

The two supports 2 and 3 * i.e. the pore-free or at least very low-pore connecting layer 2 made of nickel or a ^ Niokel-phosphorus alloy and the porous, the contact » Outer layer 3 of chromium forming the support is in as possible uniform thickness of about 0.025 mm each applied electrolytically. The Känigen method, in particular, has proven itself for producing the connecting layer 2 Process protected by patent law, proven in which the nickel layer in one containing a Niekeldispersion Electrolysis bath precipitated in extremely uniform strength will. After the order of the Chromsöhicht on this The connecting layer is the chromium layer forming the contact surface 3at least in the grooves in which the contact is made between the yarn and this edition -done, polished.

Since the Verbindungssehicht2aus nickel or a suitable nickel alloy is practically free from pores, könneri> -the not penetrate in the Schmälze fatty acids to the copper plate 1 and there is a no destructive contact element formation at the interface I ^1. Because despite the through the pores of the chrome plating 5 up to the interface 5 between this

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Chromium layer 3 and the nickel layer 2 penetrating Fatty acids due to the insensitivity of the nickel layer against the chemical influences of which there are likewise no destructive contact elements can, the chemical destruction of such heating devices is practically eliminated · But also the destructive shear stresses at the interface 4 in previously common heating devices of this type are greatly reduced or even practically eliminated, since the coefficient of thermal expansion of the invention Connection layer 2 between the coefficient of thermal expansion the copper carrier plate 1 and that of the outer chrome plating 3, which The connecting layer thus acts as a thermal expansion compensation layer.

Even if in the above description, the connection layer and the contact pad on electrolyte Paths have been applied to the carrier plate, another method is easily possible, provided that that the pads are evenly thick, so that no additional stresses can occur as a result of uneven panel thickness. Also appears it possible instead of a 5 - 6.5 mm thick Support plate made of copper only use a plate made of approximately 0.5 mm thick copper sheet

Claims t

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Claims (3)

Expectations · 1. Heating device for the heat treatment of yarns, in particular for false twist devices for treatment of synthetic yarns, consisting of a metallic carrier plate made of a material that conducts heat well, in particular copper, and a contact pad made of more wear-resistant material, in particular a chrome pad, characterized in that a pore-free (or very low-pore) connecting layer under the contact pad (3) (2) is arranged, which is insensitive to chemical influences on the part of the sludge is. 2. Heating device according to claim 1, characterized in that the coefficient of thermal expansion of this Connection layer (2) between that of the carrier plate (1) and that of the contact pad (3). 3. Heating device according to claim 1 or 2, characterized characterized in that the connecting layer (2) consists of nickel or a nickel alloy. Patent attorney Dr. W. AndreJewskl. 10983A / 1265 Blank page