DE1629798A1 - Method and device for cooling thermoplastic films - Google Patents

Description

Method and device for cooling thermoplastics Foils

The invention relates to a method and a. Contraption * for the production of thermoplastic films, which by means of an extruder after the blow molding process using a gaseous Xühlaediums be cured>

The production of foils made of thermoplastics takes place in an intruder, in which the hobst off "s © JSuBO ° lE @ it waä durck <ii © Bingdüs © a blown film injection *"

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Passing through the Abeugswalzen oni the film is cooled down ensure that the hose does not stick together on the inside. The longer the distance between the ring nozzle and the extraction device is, the better the film is cooled and the brighter it is the film can be peeled off. As the length of the extension route various restrictions u & terT / a rf en iüfc, is also the take-off speed with the well-known Felienblasanlagen relatively low

To improve the cooling and thus to increase de? Suction speed is usually between the nozzle and Ab- 'sugar device from cooling rings, an air flow against the Tubular film straightened

It has also been proposed to accelerate the Brstarrungsvorgangee hindurchzufühlen emerging from the ring nozzle tubular film by a liquid cooling medium "This action causes an increase in Abzugsgeechwlndislteito it but, considerable difficulties cillery-beits with the sealing and thermal insulation s ^ if§ © S »Ms ©« at liquid® cooling medium », on the other hand with iea © tafeis © fe®a © £ n @ ls the liquid and the uniform« -

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The hose is blown with a gaseous cooling medium that is enriched with a mist-like atomized liquid. Hie Evaporation temperature of the mist-like atomized liquid » The speed should expediently be below the temperature of the film emerging from the extruder. From a special part of the gate 1st te when the evaporation temperature of the mist-like atomized Liquid is below the solidification temperature of the plastic film - "

In order to prevent the thermoplastic film from being influenced in its surface properties by the action of the liquid, it is necessary that the mist-like atomized liquid does not form coarser droplets. The oil droplet size of the liquid must be adjusted so that a stable dispersion the liquid phase is present in the gaseous cooling medium (aerosol state) <. In practical terms, this means that the size of the drop must be 20 μ or less.

It has already been proposed to cool a blown Foil tube from the inside by feeding in To steam or spray liquid «, The Eühiung with vapors has compared to the process according to the invention the disadvantage that the evaporation energy to the cooling effect can not be exploited kanu = The spraying of Liquid brings with it the difficulty that the agglomeration of the liquid sticks to larger drops

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cannot be prevented, which leads to the film being cooled irregularly and locally thickened areas being formed and therefore not satisfied in terms of quality. In addition, liquid can be sprayed in using the usual blowing process with an upward trigger cannot be used, as the liquid will run off and come into contact with the hot blow head cannot be excluded with certainty.

Influencing the film surface by applying However, liquid can also be used in the form that for the production of foils with grained or rough Surfaces (s * Be for non-slip bags made of plastic film) the size of the droplet is dimensioned so that it is at contact the thermoplastic film provides a uniform surface cause on their surface «

In both cases, however, it is advantageous to reduce the amount of liquid on the foil surface so that the Nozzle up

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9888/2072

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To aas drying evaporation or _o R &D; *. Accelerate the cooling liquid used au, may have been _provided} that the reaching on the walls of the tubular film liquid by means of a dry _ä © optionally rwänaten iuftstroms is blown off "

In the case of an anticipated Ausfuarungsfoxn, the Luftsts-öa dsr Absugsvorriefetuag the tubular film

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Liquid from a well-known atomizer turbine beat egg, and that the atomizer turbine in one to the Xuftkanäien leading main channel is used.

In a different version of the phone, the purposes of respiration of the urine fluid to the amount of the gaseous Msdiuiae the atomizer turbine in one in the main duct aiaäesd® distribution line must be used.

next © Ausfü & ryagsform provides that after the Injek-3? Äas ± p the means to "dust off the liquid." Nozzles for Satä gaoföniige Sühlsedust and liquid "

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Kühlnedluas Fig. 2 a sohaitt through a "wide" © blasfoli ^ n-ßprita Werkseug (quill head) »it the

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blowing tubular film 10 * In the lower cooling 'ring θ lead Eühlluftlinien11, which in a provided with baffle plates 12 bing space 13. & ndeno The ßingrauza iot en de? Inner soap of the cooling ring 3 8 is provided with an air outlet gap 14, the opening width of which can be changed by an adjustable annular lip 15 »

The upper cooling ring 9 surrounds the sheet foil injection tool in a height-adjustable manner the tubular film 10 and consists essentially of the same parts as the lower cooling ring 3, namely of the two air supply lines 16, one with Baffle plates 17 provided with space 18 and an air nozzle gap 19 »which is directed in the opposite direction to the pull-off direction of the tubular film 10

The quill head 20 shown in FIG. 2 consists of one Head exact © 21, into which the mass inflow 22 and a & uhl ~ air line 23 introduced sindo Buren a Düeeaelnßatz 2 ^ iin dex suffered © of the quill head 20 is an Abeauglsitung guided $ w © l © to its upper end over the Mssneinsate 2% Ms protruding and with a Kreisfönaigea Prallfelseh 26

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Above the Pinoleukcpfas 20, a lower cooling ring 3 and an upper cooling ring 9 are arranged in the same way _{as indicated in Pig o 1}

FIG. 5 shows a particularly preferred embodiment of an annular nozzle 30 formed by a nozzle insert in a blown film injection molding unit 28, from which the film 10 emerges. which is surrounded by an air supply duct 35 housed in a conical extension 32, which ends in star-shaped ducts 34 = an insulating layer 35 is arranged in the nozzle inlet 29 »The ropes arranged within the insulating layer 35 are height-adjustable, as indicated ^{in dash-dotted lines: 36} ο The operating position shown in the dash-dotted Mniea 56 is required for the detection of the emerging when starting the system. SehlauehToHfdeto

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Luftaufführungekanal 33, on the outside of the drill hole β 37 »aas surrounding the air supply channel 33 is a rack * Spin «· del ο. like 38 attached, in which a fixed gear, a worm or the like »59 engages · Da * cogwheel or the Worms 39 can be set in rotation in a manner known per se. In the drawing, a lever 40 engaging gear 59 is shown when lever 40 is depressed in the direction of arrow 41, the locking gear 39 rotates in the same direction and moves the rack 58 vertically Direction"

The device according to the invention operates on the following Veises

According to Fig. 1, the Suhlmedium is outside on the finds of the Tubular film 10 directed in the following way;

The cooling air "is not produced by known means, see B" one shown atomizer, with finely atomized liquid

enriched and through the cooling air lines 11 the below ~ EüMri & g 3 supplied <, those arranged in the bingraura 15

13 cause dsbei by generating turbulence evenly® ¥ @ rt @ iXung dir DruekverhäXtnisee, which causes the gualmiidium below the adjustable Lippe 15 ^ US open the air outlet gap 14 from all sides the Mßem ^ a & S ä @ r tubular film 10 is directed and from there öbes am aoi? ^ © ^, along the leek wall

The cooling medium flows equally quietly through the supply line 16 into the upper cooling ring 9 on the baffle plates 17 passed and down against the conveying direction of the tubular film 10 out of the air nozzle gap 19

QeaäB Fig. 2 shows that the coolant is additionally directed onto the inner wall of the sole film 10.As already described under FIG introduced. This cooling air line 23 leads into Zentrue of the head housing 21 vertically obe &"©© dursh in the insulation 27, the äurehgefiitete through this line Kühlvon the Tsnperatur ÜBB KopfeehMneee? Λ i @ © Ii®rt nird _e

Isolation 2? is not ae & (? 1z bound in the form, but comes from that oil cooling air duct 2 Äbs & ugleitung 25 beaeichaete

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nediuns takes place through the feed up to described above into the interior of the hose and the subsequent ab » line through the suction line 25 »

Additional cooling from the outside takes place according to FIG the ready under Fig. 1 described cooling rings 8 and 9 °

Claims

009886/2072

Claims (1)

Claims rl Λ Process for the production of thermoplastic blown foils which are cooled using a gaseous cooling medium, characterized in that the cooling medium is atomized with noble-like? Liquid is enriched » 2o method aaeh claim I ₉ dadureli characterized »that di © ¥ ®r <! AapfiBäg @ t © faper & tt» the n © bel-like! Edit% at @ ^ Mlfe ά®% Φeiaparatujg * d® ^ au® dea ä®n lmsp ^ ü © Ms 1 »> Z _% thereby grates? des »a ©" foel-like 1 - 3 ₉ 60 method according to claims 1-5 »characterized in that that the amount of liquid that gets onto the foil is aaeeezi let this wipe the nozzle and trigger on the way evaporates » 7 »driving according to claims 1-6» characterized in that the gaseous medium is brought under pressure and passed through Sudden expansion to a desired »below the room lying © Temperature is controlled. according to the claims »1 ~?« thereby identified The liquid reaching the W @ && of the key foils dry "against heat", air flow 1 - S ₉ iadureh gekennsseiehnet, the direction of the amf dl © 1-9 » 30 υ a iaS € £ © S®hlais © M © 3.iö £ i | © la © @ d © r a @ fer @ s? © flaefe® lolien- and Susen for the supply of a gaseous Eühl & © dluBs as well as an extraction device for di © ale loop blown film, characterized by dl © Eoabinatioa von Mittela sua supplying liquid into the air channels with means sua atomizing this liquid in Kühlri & g® (S ₉ 9} and / or cooling air lines (J; 23j 12 "Torrichtung according to Claim 11» daSmrcli GEK mg © @ & ieh et _s that baffle plates (12 in the Zufuhrungeleltungdn for the cooling air (53 3§ 9i * W; disposed i 1 36)? 13 «Device according to Sen claims 11 <*> 12 ₉ dacteeli. gek®nn-Beiohüet _t that the Ansats (3S) for the Ki & llmf & ffim £ tstam (g into the inside of the blown film (10) is conical & u®g @ feil <t © & that the K & aiuftsu £ ürtmgel © iti3ng (33) channels (34) runs out and gate Aaeats (33) 39 * 40) adjustable in height la d®s Meeseissats 009886/2072