DE1966448A1 - PRODUCTION OF A FOAMED MOLDED BODY - Google Patents

Description

6 Frankfu.t am Main 70
Schneckanhofifr. 27- Tel. 61 70 77

1986448

Union Carbide Corp.

Eliminated from: P 19 06 654.7-16

Procedure and precaution. for the production of foam grains

The invention relates to a method and a device for producing foam bodies. In particular, the invention relates to the production of foam bodies with a cellular interior and coherent, essentially non-cellular exterior, by mixing liquid propellant with molten thermoplastic material and introducing it into an injection mold.

In the production of a foam body made of thermoplastic Material must be liquid propellant with the to be mixed Mciterlal to be mixed. Especially big problems arise when distributing a low-viscosity propellant in high viscosity, molten thermoplastic Material. · -;

Bt i a known method and corresponding apparatus for extruding foamed plastic (U.S. Patent Ni 3287 ¹ I ??.) - is the mixing of molten Legending PLASTIC 1 with the TrcJbmlttol - in an extruder. The Extruderwfvl I i * -Wftis't in several places a wreath of "narrow, long-

209 802/0885

BATH ORIGINAL

open ridges which divide the sulphurous material into two rich streams; The propellant is introduced into these individual streams.

For mixing of fluids, a Vorrichtung- is obtained: (? BE-PS O1 6i4t) I, consisting of a hollow cylinder with inlet and outlet ports therein and a shaft -bc intehendeii it f, W wherein on the ftelle successively perforated discs and Full screens with a smaller diameter are mounted. For mixing, the fluids are passed through the perched panes and, among other things, the voilsehoibcn. The mixing of the components takes place through the countless distractions on the sinuous, gypsy path within the mixing chamber and through the multiple division of the main stream into individual streams, followed by the reoccurrence of the material as it passes through the openings of the perforated discs.

The mixing achievable with this device is not sufficient for many purposes; there is a particular risk when mixing liquids with very different viscosities _; that the low-viscosity liquid, because of its greater mobility, preferentially passes through the openings and collects in larger bubbles in the high-viscosity material,

The object of the invention is a method for the intimate mixing of liquid components of different viscosity, in which this risk is avoided and an intimate and uniform distribution of the low-viscosity liquid in the high-viscosity liquid is achieved.

2; 0 9-8 8 2/0 8 6 5
^: "■■ BAD ORIGINAL

Another object of the invention is to provide a simple and yet highly wii'ksaiäe device for intimate mixing » a low-viscosity propellant with a high-viscosity, thermoplastic material to provide *

The successful solution to this problem is

a) to introduce liquid, low-viscosity propellant into a distribution zone

b) bringing thermoplastic material into an extruder, transferring it into a melt with high viscosity and continuously feeding it into the distribution zone extrude;

c) within the distribution zone the temperature above the Softening point of the thermoplastic material and the pressure above the pressure of the propellant increases hold in such a way that there is no cliäuiiien; .

d) the blowing agent and the thermoplastic material through rapidly rotating openings within the distribution zone push through to distribute the propellant, and then to subject the mixture to such intense powers of vision, that the relaxation time of the thermoplastic Material is exceeded, then intensify the mixing by viscoelastic flow

'' with the use of low powers of vision in a zone, located between the zone of strong shear forces and a second group - of rapidly rotating openings is located;

e) the mixture through a second group of rapidly rotating To push openings through;

f) the mixture from the mixing zone into an expanding one Bring Saimnelzone, with the mixture here

2098827 0865

, ..-->. ■, -. ,,, BAD ORIGINAL

in scliuie'i ^ rXuiitii ei ^flI} · Kusü-üu vnA bei et nt; ες oboi'haib des ScliM-muli-uckes vcrj '

"g) ejuo r-iprj ■ t ^, iiii £ 'fiJ'or! U box e.irtrm JJruc? ·" \ ivitcritGln c-es ScluiuradrueLeo zn hold; ^M.

Ii) a joint between the injection mold nut .ci Collection zone

i) to bring the mixture from the Sauimelzone - "quickly into the Snri iz casting mold, whereby the Druektmt-ers.eiiieci κ (between the collecting zone and the Spritzgussi'orm au cijitr rapid expansion of the mixture within'the · Spritzgus si orm fiihi- t;

j) the connection between the SpritzgiusR-forci and the Collection zone at a pressure above the Schäuhuiriicites to interrupt.

An advantageous embodiment of the method according to the invention consists in blowing agent and - thermoplastic material in the extruder at a temperature above a heating temperature of the thermoplastic material and at a pressure above the minimum pressure of the propellant, before these components enter the distribution system. This mixing can also be done together with further propellants be introduced into the distribution zone.

In a 'further modification of the method according to the invention pass through the components to be mixed within the distribution zone which lead to an intimate mixing Procedural steps several times, for which the corresponding arrangements are arranged one behind the other «

The device according to the invention for carrying out this method is marked

a) by a Juxtruder zma KxtrudieroJi t ^: «püast j iü'hcn l-iu-tei-ialö;

802/086 5

^ As BADORIGiNAU

1986448

] j) by a victor, in .velcücis ilio ^; fV; i% arai.nr Ul) Or the Erwciclningstciiipöratur of therimplast ir Mator.Uilß ropes and the pressure ßciiäiunürue over dew;: the 'i'reibmit is kept means of means -sivr ko η -tinu ·· "ierlinken receiving the theiiuoplasiischen Mai.rria.li> · in melted em; State from the extruder and means isruii supplying the liquid medium; oil _? wherein the distributor of a Ifoh 1 ordered cylinders, a rotating shaft is in OEN bafestigt at the Awei or more pez'foriertö Sclieiben siru1 _f ei äuKserer periphery in sliding contact lait represents in--! inner wall of the IlOh.1 cylinder stands, and whereby'between two perforated disks a non-perforated disk is arranged, the outer edge of which forms a narrow hanging gap with the inner wall of the hollow cylinder a; ' _r ■

c) by means of an expandable collector caniffier in connection with the distributor for Aufixalime the from xlem distributor kQmuenden mixture, in which the mixture in ge ~ molten state and at a pressure above the Schäuidruckes is held j

d) by an injection molding farm, which is kept at a pressure below the foaming pressure : \ - _.

e) by means of establishing the connection between the injection mold and the collecting chamber and to interrupt this connection in the case of a Drupk, the above the Sohäumdrucsk lies j ■

f) by means of quickly promoting the intimately ver · -. mixed material from the Sainmelkammer in the injection molding department if the connection between the two is made »

The drawings explain 1> oi «pieli> \« iiiie eiue AiiKCüIirwii ^ f..rura dorßrfindiaig.

Figs. 1 shows Iv ^ Seiteim öiciit partially iia Sehriitty a erf indimgsgoittässen _distributor} a Extrußor and ei: oe collection chamber "

FIG. 2 shows in cross section the distributor with the disks along the line 2-2 according to FIG.

3 shows the same distributor in cross section

»The line 3-3 according to FIG. 1.
■■■■■ - ■ "■ -Fig, h shows the same distributor in cross section

the line hh to .. Fig. 1.

The distributor according to the invention is particularly well suited for use in connection with an extruder and a chamber for injection molding of foamed plastic exrn with a cell-shaped interior and a contiguous , essentially non-cell-shaped exterior. Sole foam bodies are formed according to the invention by expanding a foamable mass within the injection mold. In order to achieve a uniform, cell-like structure for the interior of the display material body, an intimate distribution of the blowing agent within the thermoplastic material is necessary. The distributor according to the invention also leads, for example, to excellent mixing between low-viscosity blowing agent and high-viscosity thermoplastic material when the ratio of these viscosities is greater than 1: 100; even if the propellant is immiscible with the thermoplastic material, the distributor according to the invention can achieve an intimate and uniform distribution of the propellant within the thermoplastic material.

2 Q118 2/0865 bad. original

.. 7 - ■

}) jc in Λ1)]? ΐIdmyjr ^ presented Vorricbtun, ';ciiil> ä3t olizvyi Es tr utl er Jo with a leJti! i in front of it; K 12, o'clock, ν die F3üi - ei / ü ^r; olt or koi-ipri-iaicrtes .G "s as Troi tan f.-tel cli..rr: i, .t 'into the cylinder vies extruder?.; to be introduced kami. Di>rcl; a YuJ'til ί' ι in the conduit 12, the conduit may Zufuiir Jiie vforde regulated. "16 connects the. Jilxt.i'ucter Io with the ilvhl- 7-yliitder Ϋ.2 raises the price of the? .o. the line 3 8 performs Flüüsjghidt low viscosity in the ring-shaped ZwiseJjerira'ii? ·· between the rotating ■ Ti-ellc 24 and the Η.ο-Μylinders 22 ve ;; distributor 2a a, the rotating V ^ eIle "runs" coaxially in the remaining liohlylinder 22 _{S of} the voi-ZugSTtieirie a smooth has. Imiem * andiing to the shaft sitst ivenigsteus a Sats 26 of Scheibenj alternately, ^ i 32, and perforated discs 3o made to the perforated discs 3o non perforated Seheibe. the head ho dex 'wave is vorzugsiveise lim about 45 abg'eselirägt, in order to avoid agglomeration of the wisdom on this tunnel.

The au κ sere surface- of "slices befändet check in eijiem such a distance from the inner wall of the fixed Iiohl ~ s & ylinders that an area century force strong ticket * in the intermediate space outer between the, scope of the non-perforated disc 32 and the inner ¥ andung of the Uoülzylinders 22. Dj e ρ ei'f or i er th disks 3o are in sliding contact at 36 with the inner wall of the oil cylinder 22. The perforated disks 3o have several axially extending openings 38> preferably in the vicinity of the arrows. the required number of the openings 38 in the perforated discs 3o depends on the type of material to be processed. Usually, have the .perforierten "slices h to 24 openings around the ¥ elle .herum.

To distribute blowing agents in certain viscous melts or solutions of polymers, a single set of disks of this kind is sufficient . and sometimes aueli three such sets of discs.

-2 Q? P 8 2/0865

Dj ο Ι ^Λ ϊ / _; ;, 1 ^ (; ί £ ΐ <> ar ·: -;, -feder - '/, ntiati',!; ί v-ho Sajho: ip ··· ^ "! ^ P ^: · au; fu: r (low first ί · ν: Λ: -, - iiö only one nj eii t- j) or.Li> j Fy; \ ί (.- Be ^ .J ";·; ίί mai one; periorie .., · !;.; iTt'Iieifj-e ^ o Ικ. «. ί« \ .V-ini; · ■ · {·: \ -. ^: ;: -. i: Uiit 'Ι ·; hexte?} "cexwer. uuoi vjei "ilf" .. v «: _? so. rf>3> fi 'fti.eu ^ nui. an (V ;; IVtJj-Ii" c · f; (' u ⁷ ''';,et; Eiftfis d-ie ov ;; ue twt? ei ic loi ^ to-. 'icLci bc ί · .κϋ μ · / ■ ric'fi are xmü an ain-eelisel ^ äc Uxiiiienfolre voi> perXarJor ton πύα »ίοΐλΐ perforated SciioJT.oii voHiruidnr; iri.

are oils disks äi)

y die about the KiL] XtO oticr den -, ^f --a> iäc-ii liadic «do ^c j Ϊϊ-. · Μ · - zyjinclerö eiVtsprecheii ,. or the Ah & Uuiü znlischon c? on Sc-UfJ corresponds roughly to that. kür κβ st en Al »stand? / *? i seilen aar I- / _K \ n ->. m ':.: v, -. dung des Hohl cylinders Tind rtcr Woile; thereby, ■ virc? the vif-. The thickness of the perforated panes is not critical, but the non-perforated panes should have a thickness of about 1/1 / h to about 1/24 of the diameter of the hollow cylinder ^ 'preferably a thickness of 1 / 8 to 1/12 of the. Durchia-esö "ers of the IIoU-1 cylinder, It does not seem to suggest that this directional sol 'should be adhered to exactly,' but it has been shown that it is too thin, not perforated When disks pass through the low viscosity phase through the annular gap, the disk can be well-distributed.

The disks can 'consist' of one piece with the shaft or they can also be mounted on it. In order to meet the various requirements with regard to the material to be processed, the dimensions of the area with the visual powers, the thickness of the non-perforated disks and the number of disk units can be changed. Either interchangeable shafts or different disk units can be used for this purpose. That depends on _r = whether the units 26 and 28 are only mounted on the shaft or with diesex * consist of one part,

- \ ^; From the upper part ko of the distributor leads a line hü with a pressure valve kj _} from the distributor 2o to the inner line

ZQ # 882/0865
* v ^: BAD ORIGINAL

: - 9 - ■ ■

ttjjitf hh ^l eiiies lower part 44, tier auf ucwx 'ϊχ: χρ. <·> · -h6- ruJit * lib or "(Jf,» a lower part 44 is filch a ^; "'': uev j'li' b eiiioin ^ yI? Indian 5 «imdeineiti flask 52? der: iru iSyliiifk iijiir- ·« ml moveable lot * Dor IiGlben 52 h & t a "kogel ötii ^ nfiörisKi ^ cn head part 52 '. A iil-) l | ieiior · O- Jtluß an cIcrR bon 52 biliict a Bielitxuvg between dam cylinder fjo iiaii-KoIi) CiI! 52. / Iiii other end of. Liölljojis 52 and from iiua ua ο "I jojr raßcinl: iet e in ο piston tawgc 56.

The Ko Ib en st urge 56 carries txn ami upper l'uiilctioiialeit Kudo eJii'jii FlanscJ'Jt 58 .. 2h? Isehen fteur piston 52 mnt the Flanscji; j i.

-Is a further he piston 6o, on the piston rod 56 angeoril-- ^ not. Per ICollissii 6o Icaiux lie down in a piston geliäiiöe 62] ii <i rurifJ. Fer f'laiiscli 58 iat attached to the upper - ixuitioiiiilcit end of the piston rod 5 6 , which does not correspond to the real feel of the piston rod. The formation of the axis of the flange 58 is only important insofar as it protrudes from the piston rod 56 and beams the piston rod 56 back and forth to create a smooth contact between the holders 64 and 66,

Photoelectric switches can also be used instead be, being an excellent part on the piston rod .56 is not necessary. Two photoelectric units can be arranged so that - ■ the piston rod 56 denotes the | Light beam of the lower unit is interrupted - * when the pole moves up from the lowest position, and the Light beam of the upper unit interrupts when the piston rod reached her highest position »

From the inner line 44 'of the lower part 44 leads a line 7o scu an inner line 72 * of a second lower part 72, which also rests on the support .4.6. A mouthpiece 74 leads from the lower part 72 through the carrier 46. It is clear that several such mouthpieces can also be used to provide one or more viewing instruments.

209 8 aa / eyelet 5 bath

- Io -

'...'_ ■'. " ■■.;. '-" - - ■ ^: - 1968448 ./

βtoX! grains form zn. 3>a?> Lower liiuTe of iimi.fTotu.rkr-: 7 ^; > .- aligns jait der! feml-ung- ο in er Spx'itzgnss'foiEi from a iu! r pa- • fcrix 76 and a matrix 78, the matrix 78 is in MM: i rather way rut your carrier hG verTvanderu Die l'ftt-r ix? 6 v / Jril geto-'iigen from tJ «ai upwards and downwards high support 77“ by means of which the patrix and the matrix can easily be separated from the rinoux. G-guide in the mouthpiece 7h . And: the lower 'i ^! ail 72 eats a stick 80 anox'dnet. The 'o-berc-v' end of the rod 80 has a piston 81V »which can move i / i the Ko lh close · - ■ Jiäuse 8h sj.ch outward and downward. Dan Kci;> ia · -. ■ housing Qh has 7, white lines 85 and. 86, which can be connected to a "source" for pressurized gas

The device shown in Fig. 1 works as follows: Thermoplastic material is fed into the extruder. brought and melted there. Liquid can be produced under pressure Propellant directly into the barrel of the extruder through the Line 12 are introduced. The melted thermoplastic. see fabric and possibly the liquid propellant that comes out the extruder Io are extruded - are at a temperature above the softening temperature of the thermoplastic material and at a pressure significantly above the foaming pressure of the propellant held. The extruder Io is incontinent Connection with the annular space i? of the distributor 2o between the Ilohl cylinder 22 and the rotating shaft 2%. The melted thermoplastic material, possibly with propellant, passes continuously through the line 1.6 into the annular space 17. The liquid Propellant is introduced via the line 18 into the annular space 17, where it is then with the material from the Extruder Io is premixed. This premix is made by the Manifold 2o printed, this at a temperature above the softening temperature and at a pressure above the foaming pressure is maintained. The wave is through appropriate Drive means, e.g. by an electric motor, in rotary

BAD OHFGlNAL

-: ..- Γι ν - :. πί. ίί EC / t

J! «-; vi: gxrjg verGotzt. . ; - it "b.ci,« 3>·?>". 3 OWnY-C -too Ki r loco} νϊ -. / 5« τϊ pro idimte *. The wave ⁷ -ατ ^ ι cUU ^ -v 1 "-It-" tlcfiiolii

LV-r Veri-ejier 2o 1st iait Koi ^ vorri aitiC ^ CM yerf ?, niclii i -. TjgoIii-1.Uel siml _? xaa £: ·.;, Geiui ;; cü iii- - ^ HScIxuioJ '^ cnci ;; Kf? stnXiO ^ ίί] »al part imu dai-ut eiu solidification- dee ΐίιοτκίορΐ es tables KateriaXs .κ« verüieid-cn. A tcsoüöe-r & s. .iie.iz.eii des G misches in dcia distributor 2o is not exi'or &GT'lIgIi ₁ a: -, xm notiieridige Värrae v; ird-im lC.T.trutlGi '1 ο kengt ,. imcl the terratiir nut in the distributor only keep cool lye

The low-risk propellant is distributed to a large extent, as the GeiExseJi is pushed through the first "rapidly rotating perforated disk." When, veitereil DureJiwanoei ^ ai of the area between the ei'st s perforated plate 30 and 'the non-perforated disc moves the Treihinittel niedri ger viscosity in "ine position at the Ausseälränte-& ct not perforating th slice 32.""There is the Geraisch very s'tiirJien shear forces overworfeii _} whereby cavities arise within the therinoplastic material, which are filled by the propellant. The shear forces are so high that the speed at which the melt or solution of the polymer flows from the area of vision behind the first perforated pane to the area of strong shear forces is greater than the relaxation time of the melt or solution of the polymer. Further mixing takes place in area 55 between the imperforate disc and the second perforated disc. When the oil flows through the openings of the second perforated disc, the viscoelasticity of the polymer is used to increase the mixing by means of a viscoelastic flow, the blowing agent being distributed in the melted thermoplastic material.

2 0988 2 / Q

iiiclu "provided as a disc unit, ao verueii these Vei'fahxei-i-sscliritte repeated.

In the process according to the invention, the liquid propellant is introduced separately into the distributor, and indeed through the line IS provided for this purpose. However, it is also possible to introduce the molten thermoplastic material and the liquid blowing agent in the form of a premix from the extruder. Furthermore, the .erf intlungsgonjüsstf ™ distributor can also be built directly into the extruder. “ In such an application, the disks can be mounted directly on the extruder screw or form a part with it. In this case the extruder is in direct connection with the SaimnelzoneV

The distributor 2o is connected to the expand! he ends collecting zone 45 between the cylinder 5o, the piston 52 and the lower part 44. The intimately distributed mixture of thermoplastic material and propellant passes continuously, through the line 42 in the zone ho against the piston 52. In the line 42 is a Pressure valve 43 is provided to prevent a pressure drop in the distributor 2o during the injection molding process . When the mixture from the distributor reaches zone 45, the piston is moved from its lower position to an upper predetermined position. The lower position of the piston 52 is reached when it comes into contact with the lower part 44. The upward movement of the piston 52 and the piston 56 is counteracted by a pressurized gas in the area 51 above the piston 6o in the piston housing 62 '. Instead of pressurized gas, a suitable hydraulic fluid can also be used for this purpose. The area 51 in the piston housing 62 is provided with a conduit & 3,% _ which leads to a source of pressurized gas. When the material from the manifold 2o pushes the piston 52 upward

9 8.8 2 I 0 ^: &&& - _; , ^Γ -.-, .. BAD ORIGINAL

1ϋΒ44δ

At the same time the piston 60 airrwär & s gent, we til the area 51 presses too tight. Bas kannmir gesclieäieii, who pressure in the distributor 2o holier is old? the Büeköruelc on tleaa Koltien 52, When Aiifirartsbewegen ctes jKalbensivpLrd presses the gas in area 51 to saimaenge, and its pressure niwnnt ssii. The D-ruek. in the manifold 2o must therefore last longer than the pressure on the piston during the enlargement dfet * zone 45. The pressure in the manifold 2o is increased by the constant pressure from your extruder, which is in constant communication with your manifold. During the He w ^e he it ung of £ '0x10 45, the gas pressure in the region 51 axiöh controlled so that a similar ira substantially constant pressure on the piston 60 is atisgeübt. In any case musa the Misciiwng '.- in. the area 45 can be maintained at a pressure above the foaming pressure. According to the Hegel, a pressure of about 35 kg / eui is sufficient for this. Pressures of at least 100 kg / a bring the best results. Pressures over 700 kg / a are usually not necessary for normal work and should be avoided as they are unnecessary Cause costs.

Cylinder 50 is provided with heating devices (not shown) in order to keep the mixture in a molten state and to prevent the thermoplastic material from solidifying. Similar to the distributor 2o, however, it is not necessary to heat the mixture in the cylinder 5o. The mixture is heated in the extruder 20 "when the corresponding temperature in the cylinder 50 and in the distributor 2" can only be maintained.

The piston 52 moves upwards _? bia the flange $ 8 on the rod 56 touches the switch 66 in a certain position. As is well known, the activation of the switch 66 causes the pressurized gas to enter the piston chamber 84 through the line 85 when the piston 82 is moved upwards »the lower end of the clasp; 6c * thus becomes

196644S

so far from the mouthpiece 74 is called; pulled until it has reached the position marked (lic 87); this creates a connection between the injection molding of the oil, parts 76 and 78 and the zone 45. Since the pressure in the spray form is lower than in the Saiame zone 45, the establishment of the connection causes a pressure drop in the Saami zone 45, so that this pressure falls below the pressure in the area 5i a ilerabbewegung the stamp "52 to attain its position havingfirst fiihrtj thereby intimately distributed mixture of ~ * -thermoplastische]" material and blowing agent rapidly from the Sammei: sone45.in- FIIE Spritzgus sioxm hfncingedrüelct, NoivendigentalIs can AEIE line 7 ° ^u B ^ t the lower part 72.BiIt not be provided depicted vorrichtungett _# prevent the thermoplastic Matericils in solidification. in the Hegel but require short Zeitabstiände between the individual spray casts no zusätzlic hey heating,

the piston 52 has reached its lowest position, the zone 45 has practically collapsed. The flange 53 moves the switch 64, and compressed gas enters the piston housing 84 through the line 86 in a manner known per se . This moves the piston 82 and the rod 80 in the direction. If ^H into the mouthpiece 74 at 73, a rod 80 ^ - ^, * occurs, the connection between the Spritzgussforra and the collection zone 45 is then interrupted, who is' the pressure to the foaming pressure of the mixture. As it moves downward, the rod presses the mixture into the mouthpiece 74 between point 73 and the injection mold until the end of the rod is flush with the molded body 79. This produces a Fona body without a lost head and no unsaturated parts Stange 80 submits, öfrUOhl the production of injection molded parts that do not have a lost head.

8 8 2 / Ö16 I ORIGINAL BATHROOM

indicate, is preferred, the form of certain Spr parts also have a locked head or a recess. With the invention i? according to device can also solid thermoplastic objects produced by injection molding wfcj'cl, approx. . .,:. ' ^, -

"Because of the large pressure drop between the injection-molded egg and the saramel zone, the mixture foams up and fills the mold. To fill the mold under the action of the piston 52, the rod 80 and the expansion of the mixture in the mold , preferably times 1-15 of seconds that like .. '".. -

The flow of pressurized gas through lines 85 and 86 is iu in a manner known per se by means of a valve system and the switch "64 and 66 regulated.

The holder 66 has such a position that the required Material quantity gets into the form. The greater the distance between the switches 66 and 64, the greater the j also the upward movement of the piston 52 At a distance there is also a larger amount of material in the collecting zone collected and then pressed into the hair dryer. at Reduction of the distance between the holders 66 and 64 the amount of material coming into the mold decreases.

With the method according to the invention, a shape can be created quickly and to be filled in completely, so that a foamed Object arises that is not orientational and isotropic Has tension, and of a foamed inner and a coherent, essentially non-cellular. Outer layer. The usual difficulties, such as incomplete filling in of the ForKf. Due to premature -'- freezing d & s thermoplastic material and high internal stresses, do not occur. The "method" according to the invention

209882/088 ^,, _{; s 5} . ^ _onmmL

results obtained depend on the weight of the. foamed ₌ formal body, the Teinperatui "dei" melted thermoplastic mixture, the amount of the blowing agent; in the mixture _f the pressure in the extruder and the temperature dor shape and the formation in the zone Sammcl-, represent form "- Venn gcsclmolzene the mixture in the Sainmelzone under a higher I / air smoothly. the Schä-uradruck is, quickly conveyed into the form wii'ü, the pressure between the form and Sarnr -> !? ·· »zone causes a rapid expansion of the mixture and the formation of a cell structure". In some »cases the mixture also explodes into small cell ^: egg-shaped particles, which melt together in the form and thus fill it up quickly. After the form is filled with this cell-shaped mass, pressing in further cash register iii causes the form and its rapid expansion to the outside acting pressure that presses the outer parts of the cellular mass against the wall of the mold. " Here, the Zeil is Tarts dec-structure, and there is a dense, non-cellular skin with a thickness of at least ₅ o 5 mm to the cellular interior around. The gas escaping when the outer parts are pressed together emerges through openings in the injection mold, for example through the joint or the partial line between the two parts of the mold. Presumably this creates the special grained surface, as described above. The thickness of the non-cellular outer layer is controlled by the temperature of the mixture and the pressure in the extruder and in the collection zone. , "

The temperature of the injection mold is not of great importance. Cold forms, e.g. from room temperature to over 2o ° C, can Used to make foamed articles with a dull, grained surface that look like wood. ■ Lower mold temperatures are preferable as this reduces the Time to cool the objects in the mold is reduced. At higher temperatures, more of the ge.sch-molz.e-

20 9 8 8 2 I 0 a %% r. ■, ■ " SAD ORIGINAL

'if "■ -. ■■ ■.. - ■ -

no «mixture in oxo Fp rw hin, lieyar cl: £ esi) aWaifrlt _? wafcvi a smooth imae ρ, 1'άκί ¥>& ηα & geiMiiserte ¥ ewn Polyiithylmi lioiior ßicsiite Vörar Uei i'mnporatijrgii Itir the Spyit & giis / rfQTm yQn wenigetena "Kt 13q ° C Scliaiijiiö taffisqrpar mxt smooth gam ^ Sörtön oil) oil ^lr £ liiüli.ßji » _>

, in ^ ßl

Foxift or äavsk sciiarf py Kulcan osier; uüv gl cases antstflieiijf. werclon grppser © Hepgßij äo.ß ! prgibjaxbtftlfs .-] bß · nüfcigt "With eier Hej-g tell Wig ^ infg-ejaer Q $ gßmit% i'iß @ ist (let iiioiit eriorderlicii". ■. -.- M

Dias erfin ^ migsgeiBiisse Vp-Effiliris »-ϊϊϊϊα üie ^ Qrrxclitiuig tons have been used ^ to lind ipttoruatl seh dijreii ^ gpritai nuierlipliem ftder ^ fepntiöHißfXiGjiem method

iitWI / SIM

Claims (1)

~ IQ - ■ Pat tan spr Meke . 1, method for llerßtellimg of foam bodies with- cells förmigein inside ι »til zuGaiiiJHejililiögsüdpr., I" wGumitXichen non-cellular shaped Aussmnsehie-iit by Vo XWI provide f lüssigeia TTeibiJii.ttel with scjuiielgfiüo. &'^ Litttti IgERI thermoplastic material close to and entering in eiilii Sprit-Sgußforiu, claäiircli geKorn , nj e $ 3? ig viscous propellant, imd, by means of a , - tlieriiiaplastisciies material liolier viscosity kouin eijie Y Teilaqne included woi ^ cleii, where Yteilzsonei cJio temperature above the Err-iei «-. des-thermoplastic material-nwd der about dent geiilAHnidrwek des' freelance gelialte «, is. iunerjial.b der ¥ §rteilz; one an intimate VerBiiseliUMg takes place, ivob.ei the Kaiaponenten duren gßlxnell lOtiereiide animalrden, daa erimltenoGeaiisalv rock swr tiberseiireitiing is subjected to re dwreiv out at low © area sellers VIPL? Qelasti8qi4 strSßit wheel scteiesU g ija bold © ineöi Bruok over deia SebäuiBdruelc des in §in§ expanding SamiR & l ^ one g ^ ftiräe ^ t tnpif ¥ © rjaigelite Matqriftl from diener etnß: ■ SpyitHBgiißl'arm promoted. ■ wircl, 'which at "iRei" Bruek , is tolten ;, ft § % I i / Off I BAD OBiGiNAL .the connection between the caramel zone and the injection mold a pressure above the foam! jerk it vmt erbroclxen wii'd * 2 * Method according to Claim 1, characterized in that the. Tx and. the thermoplastic material in the extruder at a temperature above the softening pressure. tes of the thermoplastic material and one! Pressure above the foaming pressure of the propellant is predetermined. . before they are brought into the distribution zone, 3. Procedure according to objection 2, because it is held that a premix of thermoplastic material and blowing agent ujkI liquid propellant in the distribution ratio » brought ivex-the .. "'· k. .Method according to one of claims 1 to 3 _? characterized by the fact that the components to be mixed go through the steps leading to an intimate mixing in a straightforward and consecutive manner within the distribution point. . 5. Device for performing the method according to one of the Claims 1 to 4, characterized by an extruder for the Exti-uding of thermoplastic material, through, a distributor with means for continuous drawing Recording of the extruded material from the extruder and with means for supplying the liquid propellant, wherein the Verteiiex- consists of a hollow cylinder in which an x'otating wave is on the two or onehr perforated discs are attached, their outer periphery in sliding contact with the inner wall of the Iiohlzylinßers stands, and where between two perforated discs a non-perforated Seheibe is arranged, whose outer circumference a narrow annular gap with the iniienwandui \ g of the hollow cylinder, connected by an expandable Sarmnelkamroor the distributor for receiving the intimately mixed material, " through an injection mold and a connection between Injection molding forin and Saimn el chamber, by means of quickly conveying the intimately mixed material from the collecting channel into the injection molding! ¹ οϊίπ, by means of interrupting the connection between Samnielkaminer and Spritzgußf orni at a pressure above des Sehauuidruekes. 6. Apparatus according to claim 5 »characterized in that the distances between the panes at least a quarter of the inner diameter of the Ilohl cylinder. 7 * Device according to claim 5 or 6, characterized in that that the thickness of the imperforate disks l / S to 1/12 of the inner diameter of the Ilohl cylinder. 2Q9882 / Q805 BAO ORIGINAL