CS227580B1

CS227580B1 - Inlet port for injecting plast materials into moulds

Info

Publication number: CS227580B1
Application number: CS796982A
Authority: CS
Inventors: Jaroslav Panik
Original assignee: Jaroslav Panik
Priority date: 1982-11-09
Filing date: 1982-11-09
Publication date: 1984-04-16

Description

Vynález sa týká vtokového kanála na vstrekovanie plastov do foriem a rieši problém zatuhnutia, resp. vytekania materiálu zo vstrekovacích trysiek pri spracovávaní plastov.The invention relates to an inflow channel for injection molding of plastics and solves the problem of solidification, respectively. material flow from injection nozzles during plastics processing.

Známy spósob přepoj enia taviacej komory lisu na vstrekovanie plastov do foriem s dutinou formy pozostáva z dvoch častí a to zo vstrekovacej trysky, ktorá je súčasťou lisu a dýzy, ktorá je súčasťou formy. Toto převedeme nezaručuje spolahlivú, funkciu zariadenia, pretože dochádza buď k volné- ₍mu vytekaniu materiálu z trysky počas odsunu^?taviacej komory alebo k zatuhnutiu materiálu j v tryske pri dlhšom přísune taviacej komóry k formě. V dósledku sústavného stláčania vyt/če-; ného materiálu na stykových plochách tíyskyj s dýzou dochádza k postupnej deformácii / zne- ¹hodnoteniu týchto častí děleného vtokového kanála. Okrem toho sú nadmeme namáhané příslušné ’ časti formy i samotného vstrekovacieho lisu. Najmarkantnejšie sa tento nedostatok prejavuje pri_;spracovávaní húževnatých plastov, najma materiálov vystužených skleněnými vláknami, ďalej mate- i riálov s nižším tavným indexom ako polykarboná- ¹tov, polymetylmetakrylátov, polyformaldehydov a pod.The known method of switching the melting chamber of a plastic injection molding machine into a mold cavity consists of two parts, namely an injection nozzle which is part of the press and a nozzle which is part of the mold. This does not guarantee a reliable transfer the, operation of the device, since there is either a volné- _(He leakage of material from the nozzle during the ^{displacement?} Of the melting chamber or the seizing of the nozzle material SE of the head of the longer form of the smelting chamber. The result of constant compression of HE / Čepan; Joint Material tíyskyj on the contact surfaces of the nozzle is gradually deformed / ¹ Pollution of the evaluation of these divided portions of the inlet channel. in addition, the excessively stressed 'of the mold and injection-molding machine itself. this deficiency is most markedly manifested _in, processing tough plastic, particularly glass reinforced material fibers, and also mate- rials with a melt index of less than ¹ polykarboná- tov, polymethyl methacrylate, acetal and the like.

Horeuvedené nedostatky sú v podstatnej miere odstránené vtokovým kanálom na vstrekovanie plastov do foriem podlá vynálezu, ktorého podstata spočívá v tom, že má tvar kompaktného vtokového púzdra, stredom ktorého prechádza kuželový otvor, ktorého menší vstrekovací otvor je umiestnený v taviacej komoře a váčší vstrekovací otvor vyúsťuje do priestoru vtokového rozvodu v pevnej časti formy.The above-mentioned drawbacks are substantially eliminated by the plastic injection molding channel of the present invention, which is characterized in that it has the shape of a compact inlet housing, through which a conical orifice extends through which a smaller injection orifice is located in the melting chamber and a larger injection orifice into the inlet manifold space in the fixed part of the mold.

Výhody prevedenia podlá vynálezu spočívajú najma v tom, že nedochádza k namáhaniam vznikajúcim u známých riešení pritláčaním vytečeného materiálu. Použitie vtokového púzdra umožňuje vstrekovanému materiálu dostat’ sa z taviaceho valca priamo do vtokového rozvodu formy. Toto priame prepojenie vylúčilo stykovú plochu trysky s dýzou a tým i volné vytekanie materiálu, ktoré málo za následok namáhanie vtokového; kanála vlivom pritláčania vytékaného materiálu tryskou na dosadaciu plochu dýzy.The advantages of the embodiment according to the invention are, in particular, that there are no stresses arising from the known solutions by pressing the flow-out material. The use of an inlet sleeve allows the injection material to get out of the melting cylinder directly into the inlet manifold. This direct connection eliminated the nozzle-to-nozzle interface and hence the free flow of material, which little resulted in inlet strain; channel due to the pressurized material being forced through the nozzle onto the bearing surface of the nozzle.

Súčasne je vylúčené tuhnutie materiálu v tryskách a jeho degradácia v prípadoch zvýšenia teploty nad výrobcom doporučená hranicu. Nedochádza k vytekaniu materiálu, ktorý bol nespracovatelný z dóvodov lokálnych degradácií, takže vtokovú sústavu možno opátovne spracovať bez nebezpečia vzniku povrchových vzhladových vád výstrekov. Reguláciou teploty posledného pásma taviacej komory sa docieluje, že u vtokového púzdra materiál ani volné nevytéká ani V ňom nezatuhne. Tento stav usnadňuje dížka vtokového púzdra, ktorá je súčtom dížok známej trysky a dýzy. Napriek tomu nedochádza k vyššej spotřebě materiálu, pretože teplotně rozhranie roztaveného a tuhnúceho materiálu je od deliacej roviny formy vzdialené o dížku známej dýzy zvačšenej maximálně o 5 mm. V mieste teplotnélro rozhrania sa pri odsune pohyblivejtčasti formy .oddělí tulpá časť materiálu od plastickéj, pričom tuhá časť spolu s ostatnou vtokovoi&s.úštavou opušťá formu.At the same time, solidification of the material in the nozzles and its degradation in the case of temperature increase above the manufacturer is not recommended. There is no leakage of material that was unprocessable due to local degradation, so that the inflow system can be reprocessed without the risk of surface appearance defects in the sprays. By controlling the temperature of the last zone of the melting chamber, it is achieved that in the inlet housing the material neither leaks nor solidifies therein. This is facilitated by the length of the inlet housing, which is the sum of the lengths of the known nozzle and nozzle. Nevertheless, there is no higher material consumption, since the temperature interface of the molten and solidifying material is at a distance of at least 5 mm from the known separating plane of the known nozzle. At the temperature interface, when the movable part of the mold is removed, the tall part of the material is separated from the plastic, while the solid part, together with the other inlet, leaves the mold.

Celá vtoková sústava včetne vtokového kužela, tj. časť, ktorá opustila vtokové púzdro, je bez náznaku degradácie materiálu a možno ju bezozbytku v celom objemovom množstve po rozdrvení opáť spracovať na ďalšie výstreky. Použitie vtokového púzdra podlá vynálezu podstatné znižuje odpor proti tečeniu materiálu a tým i vstrekovací tlak o 1/5 až 1/4 v porovnaní so známou uzatváracou dýzou, čo umožňuje znížiť teplotu taveniny až o 50 % podlá druhu spracováváného materiálu, čím sa dosieli tiež úspora elektrickej energie. Vynález nájde hlavně uplatnenie predovšetkým tam, kde sú problémy s činnosťou známých trysiek s dýzou pri výrobě na rýchlobežných malogramážnych strojoch s automatickým cyklom vstrekovania.The entire inlet system including the inlet cone, i. the part which has left the inlet casing is free from material degradation and can be completely processed again in the entire volume after crushing. The use of the inlet sleeve according to the invention substantially reduces the creep resistance and hence the injection pressure by 1/5 to 1/4 compared to the known shut-off nozzle, which allows the melt temperature to be reduced by up to 50% depending on the type of material to be processed. electricity. In particular, the invention will find application where there are problems with the operation of the known nozzle nozzles in production on high-speed small-grilling machines with an automatic injection cycle.

Na pripojenom výkrese je znázorněný jeden příklad prevedenia vtokového púzdra podlá vyná-lezu v pozdížnom osovom řeze so zobrazením jeho prepojénia z taviacej komory do vtokového rozvodu formy.The accompanying drawing shows one example of an embodiment of the inlet casing according to the invention in a longitudinal axial section showing its interconnection from the melting chamber to the inlet manifold of the mold.

Vtokové púzdro '1 je pomocou strediaceho krúžku 8 uchytené v pevnej časti formy 12. Toto uchytenie zabraňuje axiálny pohyb vtokového púzdra 1 a podlá potřeby i pootočenie okolo pozdížnej osi. V takomto převedení je forma 12 upnutá do stroja. ₍ The inlet sleeve 1 is fastened in the fixed part of the mold 12 by means of the centering ring 8. In such an embodiment, the mold 12 is clamped into the machine. ₍

Taviaca komora 7 je ukončená maticou 9,The melting chamber 7 is terminated by a nut 9,

Claims

227580 is the sum of the lengths of a known nozzle and nozzle. Nevertheless, there is no higher consumption of material, since the temperature interface of the molten and solidifying material is spaced from the dividing plane by a length of a known nozzle which is increased by a maximum of 5 mm. In the case of the temperature boundary when moving the movable mold part, the portion of the material is separated from the plastic, leaving the rigid portion with the other inlet mold leaving the mold. The entire inlet system including the inlet cone, ie. the portion that has left the inlet casing is free from degradation of the material, and can be treated as residue in the entire volume after crushing to further shots. The use of the inlet casing according to the invention substantially reduces the flow resistance of the material and hence the injection pressure of 1/5 to 1/4 compared to the known closed nozzle, which makes it possible to reduce the melt temperature by up to 50% according to the type of material being treated, thereby also achieving The present invention finds particular application in particular where there are problems with the operation of known nozzle nozzles in the production of high speed automatic injection molding machines. In the accompanying drawing, one example of an embodiment of an inlet bush according to the invention is shown in a longitudinal axial section showing the interconnection from the melting chamber to the inlet flow of the mold. The inflow sleeve 1 is fixed by a centering ring 8 in a fixed part of the mold 12. The seal prevents the axial movement of the inflow housing 1 and, if necessary, the rotation of the outer axis. In this embodiment, the mold 12 is clamped into the machine. (Melting chamber 7 is terminated by nut 9, OBJECT

A plastic injection duct inlet channel located between the injection molding melting cylinder and a fixed mold portion of the mold, characterized in that it has the form of a compact inlet casing (1) through which a conical opening (2) extends, the smaller of which the injection opening (3) is disposed in the melting chamber (7) and the larger injection opening (4) opens into the inlet duct (11) in the fixed mold part (12).

2. A plastic injection-molding inlet channel according to claim 1, characterized in that the position of the melting chamber 7 with the melting cylinder 6 provided with a heating zone 13 to the mold part 12 fits the tapered surface 10 of the nut 9 onto the opposite conical surface of the inlet housing 1, thereby directly linking the melting chamber 7 through a conical opening 2 with an inlet manifold 11 of the mold 12. A smaller injection opening 3 opens into the melting chamber and, on the other hand, opens into the inlet manifold 11 a larger injection hole 4. The injection of material takes place while the melting chamber 7 is pushed towards the fixed mold 12. By regulating the temperature of the attractive heating zone 13 on the melting cylinder 6, there is a situation in which the temperature interface between the rigid and the plastics material is formed at the skin surface 10, under these conditions the optimum inflow distribution weight 11 is reached. for-ma 12 remains closed. Prior to the next injection cycle, the sprays are manually ejected, wherein the inlet assembly has a longer inlet pin from the reasons for its cooling to a greater distance from the molding plane 12. In the case of a solidified inlet pin on the entire length of the conical opening 2 of the inlet casing 1 and its inability to be pulled out by the inflow puller, it is possible the inlet pin is embossed in a manner similar to that of a solidified pin in a known nozzle. Upon opening the mold 12, the melting chamber 7 is moved to thereby open the injection opening 3 of the inlet casing 1. In the case of the adjustment of the short withdrawal chamber 7 up to 2/3 of the cylindrical portion of the inlet casing 1, this stroke will induce recompression in the melting chamber 7, it is superb for machines that are not equipped with this feature. BACKGROUND OF THE INVENTION The inlet sleeve (1) in a fixed mold part (12) is fixed against displacement by means of a surface seating (5) and a centering ring (8).

3. An injection channel for injection molding of plastics according to claim 1, characterized in that, at the point of contact with the nut (9), the inlet sleeve (1) is provided with an outer conical surface (10) supported by a mating opposite conical surface formed in the nut. (9) screwed into the melting cylinder (6) such that an outer diameter of the inlet housing (1) is disposed in the inner hole of the nut (9). 1 drawing