DE1460394A1 - Method for impregnating bands - Google Patents

Description

PtttntinwiH

DipL-lng. Waif r Jadrf, * 7 Stutteart N. Mmafacnfe 40

J.Jti. tenner & Co. Ltd.

Mar fleet, IIull, Yorkshire _ A23 184-p

England

1.FC JuIt 1969

Method for impregnating tapes

The present invention relates to a method for the manufacture of ligaments and belts, namely of such ligaments, which have an impregnated ifexti! carcass.

Impregnation of the textile carcasses of tapes is usually done in continuous processes. The carcass can, for example, be peeled off a roller and then passed through a srook chamber, at the bottom with an impregnation bath made of e.g. JoIj vinyl chloride in the liquid state as well as by a Heizksmmer to solidify the impregnation and finally through a Cooling chamber or a cooling bath are performed. The thus obtained impregnated carcass is then wound up. With such procedures becomes the carcass when entering the impregnation bar usually passed between Preßwalaen to the in to displace the air present in the carcass cavities. Despite this measure, Jedocli slightly remains in the residual air Carcass, which is then enclosed by the impregnation material becomes and in the form of air bubbles in the. finished tape remains. This disclosure is necessary and undesirable.

The object of the invention is to create sines Process for the production of fans in continuous Working manner being a lextile carcass under such conditions is impregnated so that the occurrence of air bubbles in the end product is essentially excluded,

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909883/1424

U60394

The erfitidungs ^ e: aäij proposed method for solving dieaer object is characterized mainly in äa2 l'performed extilkarkasse continuously through a liquid Iniprä ^ here material and thereby a 'IEIL of Imprägnierstoffes vacuum is exposed with respect to the atmospheric pressure together with at least.

According to a specific embodiment of the ne.ch der Invention, a textile carcass leads into an impregnation bath, whereupon the impregnated carcass in a phase of Passing through the impregnation bath to a vacuum treatment to remove any residual air from their cavities will.

Another form of the invention provides a method for continuous production of tapes by impregnating a continuous woven textile carcass in such a way that that the textile carcass is passed through an impregnation bath, whereby the pressure prevailing in the impregnation material over the bath length from a maximum value to a minimum value and increases again and the carcass is lowest in the area Pressure is exposed to a partial vacuum. In this process, it can be particularly useful to a textile carcass continuously in an impregnating material introduce and during a shorter cycle time in an approximately horizontal position of impregnation with atmospheric pressure as well as to be subjected to an impregnation with negative pressure in an approximately vertical position during a longer cycle time.

In a further embodiment of the method according to the invention is a textile carcass continuously in an impregnation fabric under atmospheric pressure and then through a column of the Impregnating material out, which latter inside a standpipe above the level of the impregnation bath is housed and with respect to the atmosphere negative pressure

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U60394

having*. The standpipe can, in particular, be arranged with its subsection inside the impregnation bath in such a way as to act as a seal for the filling of the standpipe. In the upper section of the standpipe, negative pressure is created, which is only sufficient for partial filling with impregnation material, whereby the band exits from the upper liquid level in the standpipe during its duration and reaches the negative pressure atmosphere, whereby the band is subjected to a bend in order to accelerate the exit of the residual air will. In a special and preferred embodiment of the method according to the invention, the textile carcass is passed through the impregnation bath, where the impregnation takes place, then passed upwards in the standpipe into the upper section of the standpipe designed as a vacuum chamber, where air inclusions are removed, and then through the standpipe pulled down and out of the impregnation bath. The negative pressure in the upper section of the standpipe pulls the impregnating material upwards in the pipe and at the same time limits the volume of the negative pressure chamber. In this way, not only is the effectiveness of the ventilation process improved, it also increases the length of the fabric running through the impregnation material. The negative pressure in the upper section of the standpipe can be maintained by a standard vacuum pump.

The invention is now based on the *? Admission explained in more detail, in which an embodiment of the inventive method is illustrated. Thereby # ί | ιβ is an attachment for the implementation of the process with impregnation; Jmd standpipe in Vertical solitude indicated.

shown in $ ev drawing _f the lower, open area emerges

# ^ n ^ s standpipe 1 in a bath 2 made of polyvinyl chloride in a huge condition. The top of the standpipe is up

; ..; ■■■ - 4 -

90988 3 / U24

U60394

on a connection 3 to a "vacuum pump, not shown closed. When the vacuum pump is working, the polyvinyl chloride is pushed up into the standpipe up to level 4 drawn which of the highest possible 'funding level of the Bunpe in terms of corresponds to the vapor pressure of polyvinyl chloride. The interior of the standpipe obertialb of the mirror 4 forms the Negative pressure range of the process, the negative pressure being maintained by the vacuum pump.

The textile carcass 5 to be impregnated runs between pressure rollers 6, which push out most of the air content of the carcass. Immediately after leaving the The carcass enters the impregnation bath 2 by pressure rollers. After passing through the impregnation bath, the carcass is in the standpipe guided upwards and remains, initially within a column of liquid polyvinyl chloride until it exits of the mirror 4 enters the vacuum chamber. Any remaining air bubbles are removed from the already impregnated The textile carcass is removed by negative pressure, and this re-enters the mirror 4 of the Eadsäule. The carcass v. 'is then guided downwards in the standpipe and leaves the bath at the exit point €. The movement of the textile carcass v. is controlled by guide rollers 7. The procedure outlined kbvnn can be carried out completely continuously.

A standstill of the vacuum pump and canceled negative pressure in the Standpipe, the mirror is inside the same level with the outside bath. So the latter is opposite to that The operating state with the mirror 4 raised inside the standpipe at rest is considerably higher. The bath tank must therefore be dimensioned large enough to cope with the thus changing standing height. Consider one example The coming height of the standpipe of 6.4 m is this in the operating state The volume of polyvinyl chloride in the standpipe is considerable. The resulting extension of the throughput

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U60394

because of the textile carcass within the impregnation material permits a reduction in the section of the passage length which is allotted to the bath tank, provided that the corresponding Stand height change in the bath tank can be managed. The process steps and dimensions can be in any case be chosen so that the to be impregnated Textile carcass during a smaller part of the lead time the impregnation bath in an approximately horizontal position and during a larger part of the throughput time in an approximately vertical position is exposed.

On the other hand, the passage length within the bath tank can also be enlarged in order to achieve a better impregnation of the carcass. Main feature of the ^ Terfceen according to the invention is ^ edooh the distance of air bubbles from the impregnated textile carcass in continuous operation.

Furthermore, it has been crocheted advising that the bending of the impregnated textile carcass on respective Hihrungswalzen within einfs IFöterdrückbareiohes, bB in the upper Ab-f-section of the Standrblares remain the Auetrittögeschwindigkeit the IiUfteinsohlÜBBe ia of the carcass as a fully enclosed air bubbles within the ffextilikarkasse or within the \ impregnation could be increased considerably. For this it is even not absolutely necessary that the car cash leaves the level of the Iiapreggnierstoffes rich in the oppressed. Much more satisfactory results have been obtained even if the textile carcass rises and descends in the column of the waterproofing taffy without exceeding its upper level.

Claims (2)

Λ η S ρ r ν. C h e 1. Procedure for impregnating tapes with a textile carcass, dadurcu marked that the Textilkc.rki.sse continuously passed through a liquid impregnating agent and together with at least a part of the impregnating substance, negative pressure with respect to the atmospheric pressure i-usgetat v; ird. 2. The method according to claim 1, characterized in that · the Textile carcass continuously into a liquid Irapregnant guided and after the impregnation has been initiated in a flow area within the Iaipregnierstoffes a vacuum treatment to remove air residues is subjected to within the textile carcass. 3. The method according to claim 1 or 2 for impregnating a woven textile carcass, characterized in that the Textile carcass is passed through an impregnation bath, within which the prevailing in the impregnation material Pressure decreases from a maximum value to a minimum value and increases again, with the carcass being the lowest in the area Pressure is exposed to a partial vacuum. 4. The method according to one or more of the preceding claims, characterized in that the textile carcass during a smaller part of the Dureiilaufzeit within of the impregnation bath in an approximately horizontal position atmospheric pressure and during a larger part of the Throughput time in an approximately vertical position under a negative pressure is exposed. Meue documents (Art. Y gi para. 2 rv 1st sentence 3 of Äprjer _U p _T .qo _{S. V.} 4.9.7907) 809883/1 * 2 * ^ _{0 0RlelNAL} H60394 ■ v-erfati-ren according to -.insprucn ;;, dadurcL marked that the textile carcass su Anfan j ö.e: n iTiprägnierstcff im ν ^ suf dei "Druck des Impr'ignierstoffs' over the Eaallänge to 2iU einü vorljestiiii:, ben" Jindestv / ert reduced and ^> Kcllie3end gradually back to AteospL / lrendrucn. er-1-Ci-t v; ird _f vvouei the Ilarlcuöse iai! Eereict. des Ranst - pressure - from de, j Jxiprä ^ uiG-'stoff is removed and a 2ei3-rakuu-i is activated, and since C the final exit of the Larkacse from Germany; Larrägnierbad again "at AtnGspii pressure of the Iraprä ^ tiierstcrfes takes place. Yeri'al.reu nac \ ± a. ·!] Or inel.'reren of the vcran ^ eLenden An sprücue, dcdurcli geke. ^ Ut-eicbuet that the te;: tilk £ .rkc "sse continuously in eiii under- ' -thcspheric.pressure controlling L'jprä ^ iiieri'Ed ^ exv'krt lil.1 ansculießeud passed through a pillar of the impregnating substance protruding from the lapra ^ nierbad -..- iv "., v? obei the lyre leveled off. -pillar iaiierLnll: a -'it ^ udröhres is vialed to negative pressure. Teri'aLren nack ^ nspruck 5, dr.dur.cL gekenuiüeicLnet, di- £ i.-i Upper Absclmitt des. ^ tcndrokres an only ^ ur part- '.' • eieeu Pülluus; same with liquid impregnation agent Sufficient negative pressure is introduced that the " • lextilkoi'kssae when passing through the impregnating material column from whose 'upper mirror emerges into a TeiivaJmuun and when passing through this negative pressure area, a bend is accelerated by the air outlet is subjected. Yerfahren according to claim 6 or 7, characterized in that that the tertile carcass besides an impregnation a further impregnation under atmospheric pressure Vacuum is subjected to an enlarged passage length within a vertical standpipe. 90 988 3 / 1A2i _6A0 ORIGINAL H60394 2. V he fa lire α according to one or more of the preceding claims, characterized in that the Te: = tili.: C-rl: asse passes through press rolls 2iur reduction ä.e.3 Luftgei-old before entering the impregnation bath . IG. Method inci: one or more of the preceding η claims, characterized in that as an impregnating agent PolyvinylcVilorid, which is dissolved in the liquid state, is pre-treated is. 909883 / 14.2A _6AD ORIGINAL