SE200334C1

SE200334C1 -

Info

Publication number: SE200334C1
Authority: SE
Publication date: 1965-01-01

Description

Uppfinnare: H R Spreeuwers Prioritet begiird !ran den 22 junt 1960 (Nederlanderna) Foreliggande uppfinning hanfor sig till en for blandning av ett termoplastiskt amne med ett annat, fast anme avsedd skruvsprutmaskin, till vilken de bada amnena matas Tar for sig. Inventor: H R Spreeuwers Priority Beginning June 22, 1960 (The Netherlands) The present invention relates to a mixture of a thermoplastic blank with another fixed screw extruder, to which the two blanks are fed separately.

Vid en land maskin av detta slag transporteras det termoplastiska amnet och det andra amnet medelst transportband, vilkas hastigheter aro noggrant avpassade i fOnhallande till Tarandra i beroende av det onskade blandningsforhallandet, till ett stalle ovanfor skruvmaskinens matningstratt och ía harifran fritt falla ned i tratten. Nagon fullstandig jamn fordelning av amnena i blandningen .sker emellertid icke harvid. In a land machine of this kind, the thermoplastic blank and the other blank are transported by means of conveyor belts, the speeds of which are carefully adjusted in relation to Tarandra depending on the desired mixing ratio, to a stable above the screw hopper feed hopper and from there fall freely into the hopper. However, no completely even distribution of the substances in the mixture occurs.

For att astadkomma battre blandning har man darfOr utformat en skruvsprutmaskin, vilken har en sarskild matningstratt for det andra amnet, som i det foljande benamnes pigment, medan det termoplastiska amnet halles i den vanliga matningstratten. Matningstratten for pigment är dâ belaget pa ett storre avstand fran skruvsprutmaskinens avgivningsande an matningstratten for det termoplastiska amnet och dr dessutom sa dimensionerad eller forsedd med en utportioneringsanordning, att mangden av det till maskinens transportskruv anlandande pigmentet star i onskad proportion till mangden av det termoplastiska amnet. In order to achieve a better mixture, a screwdriver has been designed which has a special feeding funnel for the second blank, which in the following is called pigment, while the thermoplastic blank is kept in the usual feeding funnel. The pigment feed hopper is then located at a greater distance from the dispensing machine of the screw extruder than the hopper for the thermoplastic blank and is also dimensioned or provided with a dispensing device that the amount of pigment reaching the machine screw transporting the screw is in undesired proportion to the amount of the thermoplastic blank.

Vid en kand skruvsprutmaskin av detta slag forblandas ett koncentrat av en finmald termoplast oth ett pigment, och detta koncentrat far sedan falla genom en tratt och ned till en skruv i en undermatad press, i vilken koncentratet smaltes och Iran vilken det utpressas i en cylinder till en storre press, 1 -vilken koncentratet blandas med termoplasten. Denna maskin är alltst relativt komplicerad, beroende pa att pigmentet maste inblandas i plasten i tva steg. Om namligen pigmentet direkt skulle blandas med plasten kan det vid inbland- Dupl. kl. 39 a4: 1/00; 39 a4: 3/02 fling av en stor mangd pigment foreligga den oldgenheten, att pigmentet under inverkan av tyngdkraften kvarstannar vid skruvkanalens botten, sa att pigmentet icke kommer att blandas homogent med det termoplastiska amnet mom den aterstaende delen av skruvkanalw. Visserligen kan denna olagenhet undanrojas genom begagnande av en langre skruv eller genom 8kning av skruvens hastighet, varigertom maskinens blandningsverkan okas, men namnda olagenhet un.dvikes pa ett enklare salt genom att maskinen utformas i enlighet med for eliggande uppfinning. In a screw extruder of this kind, a concentrate of a finely ground thermoplastic and a pigment is premixed, and this concentrate is then allowed to fall through a funnel and down to a screw in an underfed press, in which the concentrate is melted and Iran in which it is extruded into a cylinder to a larger pressure, 1 -which the concentrate is mixed with the thermoplastic. This machine is always relatively complicated, due to the fact that the pigment must be mixed into the plastic in two steps. Namely, if the pigment were to be mixed directly with the plastic, it could be mixed- Dupl. at 39 a4: 1/00; 39 a4: 3/02 flake of a large amount of pigment there is the antiquity that the pigment under the influence of gravity remains at the bottom of the screw channel, so that the pigment will not mix homogeneously with the thermoplastic element with the remaining part of the screw channel. Admittedly, this malfunction can be eliminated by using a longer screw or by increasing the speed of the screw, thereby increasing the mixing action of the machine, but said malfunction is avoided on a simpler salt by designing the machine in accordance with the present invention.

En skruvsprutmaskin enligt uppfinningen kannetecknas darav, att den ena matningstratten har ett matningsror, vilket stracker sig genom den andra matningstratten och mynnar nara maskinens iskruv och nara den vaggdel av den andra matningstratten, som befinner sig langst fran maskinens avgivningsandt% En del av den proportionellt mindre mangden amne, — pigment —, som inmatas genom den f6rsta tratten, liar redan upptagits av det termoplastiska amnet, innan ,detta har matt skruvkanalen. Harigenom komma de boada amnena aft blandas mera homogent. En uppenbar fordel vid begagnandet av maskinen enligt uppfinningen Or vidare, att pigmentet utkommer frail matningsroret pa en niva under ytan av det kornformiga, termoplastiska amnet i den andra tratten. Harigenom hindras det vanligen pulverforthiga pigmentet att flyga omkring i arbetsrummet. A screwdriver according to the invention can be characterized in that one feed hopper has a feed tube which extends through the other feed hopper and opens near the ice screw of the machine and near the cradle part of the other feed hopper which is furthest from the dispensing end of the machine% the amount of substance, - pigment -, which is fed through the first funnel, has already been taken up by the thermoplastic substance, before, this has matted the screw channel. As a result, the boada amnena aft mix more homogeneously. An obvious advantage of using the machine according to the invention is furthermore that the pigment emerges from the feed tube at a level below the surface of the granular thermoplastic blank in the second funnel. This prevents the usually powdery pigment from flying around in the workroom.

Matningsrorets langd kan varieras i beroende av det satt, pa vilket roret är fastsatt. The length of the feed pipe can be varied depending on the way in which the pipe is attached.

Om matningsriiret Or anordnat forhallande till skruvsprutmaskinen, bor det icke skjuta forbi den undre anden av matningstratten. If the feed tube Or is arranged in relation to the screwdriver, it should not slide past the lower spirit of the hopper.

Om daremot matningsr5ret är anordnat rorligt, kan r8rets undre ande fa inskjuta i skruv- 2— — sprutmaskinens holje ,och in i skruvkanalen, dock endast sa mycket, att transportskruven medbringar roret utan att riirets undre ande klammes mellan transportskruvens gangor och niatningstrattens vagg. Med andra ord maste det vara mojligt fOr matningsrorets undre ande, sedan rOret lamnats i utgangslage, att svanga en liten vinkel for att glida over kanten av skruvgangan ()eh rora sig tillbaka till utgangslaget. For att hjalpa roret med att svanga tillbaka kan en fjader begagnas. Rorlighet kan aven uppnas genom begagnande av ett matningsror air elastiskt material. If, on the other hand, the feed tube is arranged movably, the lower spirit of the tube may slide into the housing of the screwdriver, and into the screw channel, but only so much that the transport screw carries the tube without the lower spirit of the tube being clamped between the conveyor screw passages and the hopper. In other words, it must be possible for the lower spirit of the feed tube, after the tube has been left in the starting position, to pivot a small angle to slide over the edge of the screw thread () and move back to the starting position. To help the rudder swing back, a spring can be used. Mobility can also be achieved by using a feed tube air elastic material.

Sadan rorelse fram och ater air matningsroret underlattar blandningen air amnena. Such movement back and forth in the air supply tube facilitates the mixing of the air amnena.

Uppfinningen skall i det foljande beskrivas under hanvisning till bifogade ritning, vilken delvis i sektion visar en utforingsform air en maskin enligt uppfinningen. The invention will be described in the following with reference to the accompanying drawing, which partly in section shows an embodiment of a machine according to the invention.

En i enlighet med uppfinningen utformad skruvsprutmaskin 1 her ett hOlje 2, en matningstratt 3 och en slimy 4. Holjet 2 liar en matningszon 5, en ,smaltzon 6 och en avgivningszon 7. Skruven 4 ar roterbart monterad i holjet 2 och drives air en endast schematiskt antydd drivmekanism 8. A screw sprayer 1 designed in accordance with the invention has a casing 2, a feed hopper 3 and a slimy 4. The casing 2 has a feed zone 5, a, narrow zone 6 and a discharge zone 7. The screw 4 is rotatably mounted in the casing 2 and is driven air only. schematically indicated drive mechanism 8.

Matningstratten 3 bestar pa vanligt satt av en konformig matningszon 9 och en cylindrisk avgivningszon 10, Termoplastmaterial 11 i form av korn eller flingor matas in i tratten 3, och vid igangsattning av drivmekanismen 8 stronamar materialet 11 fran. matningstratten 3 genom .matningszonen 9 och avgivningszonen 10 till matningszonen 5 i skruvsprutmaskinens holje 2. The hopper 3 usually consists of a conical feed zone 9 and a cylindrical discharge zone 10, thermoplastic material 11 in the form of grains or flakes is fed into the hopper 3, and when the drive mechanism 8 is actuated, the material 11 struts from. the hopper 3 through the feed zone 9 and the discharge zone 10 to the feed zone 5 in the casing machine housing 2.

I matningstratten 3 inskjuter ett ror 12, till vilket ett amne 13, som skall blandas med det termoplastiska amnet, kan matas medelst en lac visad portioneringsanordning. Floret 12 dr excentriskt anbragt i matningstratten 3 och befinner sig narmast den sida av tratten, som ligger 'angst fran skruvsprutmaskinens 1 avgivningszon 7. Roret 12 befinner sig emellertid pa ett sadant avstand frau den narmaste vaggdelen av tratten, att det kornformiga termoplastmaterialet 11 kan gâ fritt mellan roret 12 och den intilliggande vaggdelen av tratten 3. Avstandet mellan r8ret 12 och namnda vaggdel av tratten. 3 maste därfOr valjas i beroende av storleken air kornen eller flingorna air termoplastmaterialet 11. Lampligen ar darfor r8- ret 12 sa. ,anordnat, att det kan forflyttas nagot i forhallande till skruvsprutmaskinen. Inserted in the feed hopper 3 is a tube 12, to which a blank 13, which is to be mixed with the thermoplastic blank, can be fed by means of a portioning device shown in a lac. The flute 12 is located eccentrically in the feed hopper 3 and is located closest to the side of the hopper which is angled from the discharge zone 7 of the screw sprayer 1. However, the tube 12 is located at such a distance from the nearest rock part of the hopper that the granular thermoplastic material 11 can pass freely between the tube 12 and the adjacent cradle portion of the hopper 3. The distance between the tube 12 and said cradle portion of the hopper. 3 must therefore be selected depending on the size of the grains or flakes of the thermoplastic material 11. Therefore, the tube 12 is 12 sa. , arranged that it can be moved somewhat in relation to the screwdriver.

Roret 12 stracker sig med sin undre ande 14 fram till narheten av transportskruvens 4 omkrets. Vid den visade utforingsforme,n är rorets 12 undre ande 14 sa avfasad, att rorets 12 avgivningsande är vand mot den intilliggande vaggdelen av tratten 3, eftersom man genom derma atgard kan underlatta blandningen air termoplastmaterialet 11 och amnet 13. The rudder 12 extends with its lower spirit 14 to the vicinity of the circumference of the transport screw 4. In the embodiment shown, the lower end 14 of the tube 12 is so chamfered that the discharge end of the tube 12 is water against the adjacent rock part of the funnel 3, since by means of this action the mixture of the thermoplastic material 11 and the blank 13 can be facilitated.

Vid den beskrivna utfOringsformen divergera avgivningszonen 10 och avgivningsanden 14 av roret neat till foljd av den cylindriska formen av trattens 3 avgivningszon 10. Da matningstratten 3 liar helt konisk form, Or roret 12 lampligen sa avfasat, att det aven i detta fall foreligger divergens mellan trattvagcen och rorets 12 avfasade ande. In the described embodiment, the dispensing zone 10 and the dispensing spirit 14 of the tube neatly diverge due to the cylindrical shape of the dispensing zone 10 of the hopper 3. Since the feed hopper 3 has a completely conical shape, the tube 12 is suitably beveled so that in this case there is also divergence between the hopper and the beveled spirit of the rudder 12.

For att underlatta matningen av amnet till roret 12 kan det senare upptill vara forsett med en. trattformig utvidgning 15. To facilitate the feeding of the blank to the rudder 12, the latter at the top may be provided with a. funnel-shaped extension 15.

Rorets 12 vidd Or lampligen avpassad efter det onskade blandningsforhallandet mellan amnena 11 och 13. The width of the rudder 12 is suitably adapted to the desired mixing ratio between the workpieces 11 and 13.

Medelst den beskrivna anordningen blandades polymeriserad polyaminkapronsyra med en sadan mangd grafitpulver, att den erhallna bladniagen inneholl 15 vikt-% av sistnimnda amne. By means of the described device, polymerized polyamine caproic acid was mixed with such an amount of graphite powder that the obtained leaf powder contained 15% by weight of the latter substance.

Vid utforande av delta forfarande upphettades forst skruvsprutnaaskinen till en temperatur av 280° C. Sedan denna temperatur uppnalts, fylldes matningstratten 3 med kornformig, polymeriserad polyaminokapronsyra, vars korn hade en storlek av 3 X 3 mm. Darefter igangsattes transportskruvens 4 drivmekanism, och portionerad matning av grafitpulver till roret 12 paborjades. When carrying out the delta process, the screwdriver was first heated to a temperature of 280 ° C. After reaching this temperature, the feed hopper 3 was filled with granular, polymerized polyaminocaproic acid, the grains of which were 3 x 3 mm in size. Then, the drive mechanism 4 of the conveyor screw 4 was actuated, and portioned supply of graphite powder to the rudder 12 was started.

Fran holjets 2 avgivningszon 7 utsprutades blandningen i form air en remsa med H-formig tvarsektion. Denna remsa hade stor jamnhet i fra.ga om fordelning av pigmentet i polvarniden. From the dispensing zone 7 of the casing 2, the mixture was sprayed in the form of an H-shaped cross-section. This strip had great uniformity in terms of distribution of the pigment in the polar varnish.

Blandningen kan emellertid aven sprutas till en tjock strang, som uppdelas till horn. However, the mixture can also be sprayed into a thick strand, which is divided into horns.

De salunda behandlade kornen ha den fordelen, att det under kornens transport icke nppstar flagon avskiljning air pigment fran polyamiden. Dessa korn, kunna sedan begagnas for sprutformning eller strangsprutning. De ,erhallna produkterna utmarka sig for en stor fargjamnhet, som kan uppnas vid andra satt att blanda utgangsmaterialen, endast om blandningen utfores under avsevart lO.ngre tidrymd. The grains thus treated have the advantage that during the transport of the grains no flake separates air pigment from the polyamide. These grains can then be used for injection molding or extrusion. The products obtained are marked by a large color uniformity which can be obtained by other means of mixing the starting materials, only if the mixing is carried out for a considerable period of time.

Dessutom di det mojligt att mata blandningen av ternaoplastiskt amne och annat amne direkt till en formsprutmaskin eller en annan med slag arbetande sprutmaskin, medan blandningen fortfarande befinner sig i plastiskt tillstand. In addition, it is possible to feed the mixture of ternaoplastic substance and other substance directly to an injection molding machine or another type of injection molding machine, while the mixture is still in a plastic state.

Sasom exempel pO. andra amnen, som enligt uppfinningen Nit kunna blandas med termoplastiska amnen, ma namnas kolsvart (i mangder air 2-5 % eller mera), molybdensulfid (t. ex. 4 %) eller amorf kiseldioxid, som ar mycket skrymmande och darfor war att behandla. As an example pO. other substances which, according to the invention, can be mixed with thermoplastic substances, may be called carbon black (in amounts of 2-5% or more), molybdenum sulphide (eg 4%) or amorphous silica, which are very bulky and therefore difficult to treat. .

Claims

Patent claim:

A screwdriver which carries a pair of different feed hoppers, characterized in that one feed hopper (15) carries a feed tube (12) which projects through the other feed hopper (3) and opens near the slimy (4) of the machine and near the wall part of the second hopper, which is furthest from the discharge end of the machine (7).

2. A machine according to claim 1, characterized in that the feed tube (12) is such. beveled at its lower end, all of the rudder discharge opening is water towards the adjacent cradle portion of the second hopper (3), into which the hopper extends, and that the beveled aide of the hopper and the adjacent portion of the second hopper diverge toward the machine. screw (4).

3. A machine according to any one of the preceding patent claims, characterized in that the feed tube (12) is movably arranged in the second feed funnel (3) and with its lower end projects so far between the passages on the machine screw transport screw (4) that the tube during normal operation is carried by the screw threads but is released before the tube reaches the cradle of the hopper. Request publications: Patents Iran Sweden 153,039; Great Britain 733 911; USA 2 382 655.