DE1729333C - Multiple injection nozzle for hot runner injection molding tools - Google Patents

Description

because the attachment and the assembly then extremely

gets complicated. In addition, int at such an

¹ order with several, not with each other in heat

conductive connection heat conducting cores

The present invention relates to a multiple injector 40 not certain that they all have the same temperature for hot runner injection molding tools.

with a plurality of partly in a distributor plate The invention is based on the object of

and partly in the die of the hot runner injection molding a hot runner tool for injection, in particular tool arranged with a single feeder of a thin-walled injection molded part, for example Line-connected supply channels for the inlet of a drinking cup, on the small one around the Verriespritzende Injection molding compound. Successful part for determining the core compared to the

When producing a relatively thin-walled die there is a space available around it For cups or containers made of plastic, there are a number of units provided with heat-conducting cores, that the injection orifices are to be arranged by the cumulation of the injection molding.

pressure due to the small wall thickness of the die from its central position in the die in that each feed channel is able to press one into it out of the nozzle of the type mentioned above. As a result, over a part of its length up to slight wall thickness differences in the finished, thin injection opening associated with it can occur in the molded-walled cups or containers. 55 cavity of the injection mold extending To avoid this disadvantage, it is possible to have heat conducting cores and - that all heat conducting cores as described in Swiss Patent 451 494 together and with the heated distributor plate in, in the area of the molded parts that are the bottom heat-conducting connection
According to a further embodiment of the invention, the plunger-like locking device 60 has the multiple injection nozzle to provide an axis of symmetry which is used to lock the, around which the injection openings with the two molded parts by moving in its axial direction associated heat conducting cores are arranged coaxially in a recess in the die.

can be practiced. The heat conducting cores are expediently as

When such a locking part 65 is arranged, parts of a connecting piece are formed which over However, it is no longer possible to use a single zen as part of its circumference arranged injection nozzle of the type described piece is tightly connected to the distributor plate, what to see. If the injection nozzle is eccentrically next to the extension piece at least one, the feeder

Γ *

, hole connecting with the supply channels having

The advantages achievable with the invention are in particular that it is the first time becomes possible, a plurality of injection openings, each of which is a thermal conductor of the mentioned Type is assigned, in a relatively narrow space, in particular a locking part of the mentioned type around, to be arranged and at the same time exactly the same

_sl ark cooled w, rd and P ^ " _de """ RIm in

during the »
the

nde d

_of ^ _each m Spritzvorwerden must, can rmwerden on a result of the loading _mg of the strength of the plastic ^Zl;, J _{f [en voltage} compared to the HER-Pf ^ ntzdusen _{one horse,} it is _Einspritzö f voltages to clogging _j

Films in the J

kind mentioned around to arrange, while at the same kommhchen ed ^ f _Einspritzö calculations to time to ensure that all Wärmeleitkerne exactly io possible that A «™ * s _{hr Ejner} constipation

have the same temperature. Furthermore, the result is, without α, as will be explained in detail, one of the same reductions _in the dimensions

Reduction of the dimensions of the injection ^{openings. The »β« 1} ™ « _{on the part to} be produced is

genes and thus the injection points on the molded part. the injection point at the _injection point, which is

An embodiment of the invention is provide in the _"5 minute""^J" shows _the ähflüss.ger _from, or drawing and in more detail below loading special 'b ^ ⁿ ^ P g _{mass-produced} are written. This Mehrfacheinspritzdüse has four of ^trans P ^arene *. _w ichtigkeit is. coaxially around the symmetry axis A angeord- to ^ ^W ^ h _ünstiger Ausb.ldung the items, branched off from the feed line 21 feed When £ ° ™ ⁿ ^ _their common connection transit channels 22, through which said molding compound in * o W? f ™ J ^ke ™ ² yrs ^ f _{kanälc 22 is be} the hot liquid state is supplied. in the interior stud «« ™ ^ _gen above the herkoinrnl.-

Each supply channel 22 is a coaxial to the Einspntz- ^lv ' ^cnrf ^ X ^ "Vhfacheinspri opening 23 of the relevant supply channel and itself
A heat conducting core 24 extending into the injection opening 23 is arranged, with all heat conducting cores a ₅

24 below and with the heated distribution plate

25 are in a thermally conductive connection. Di-. Feed channels 22 are partly in the distributor plate 25, partly in the die 26 of the molding tool provided recesses formed.

Between the injection openings 23 is the ■ m Die 27 axially displaceably guided, stößelart.g id Vriltil 28 ichtbar the for

chen so

rake

3o

Stamp 27 axially displaceable gef, trained locking part 28 visible, the for Locking of the punch 27 with respect to the die 26 in the initial phase of the E.wpntzvorganges

_gen over the

^ X ^ " _{iner multiple} injectors kern n Ausbi J" ⁿ S _{k hr not} wend.g to eme

high E.nspmza m _cavity it 32 to

^ "Precast parts with minor inner. _Can

_{23 are opposed to} the side of the cylindrical ausgeh. Vckinäßig ^ _fJ-rn \ ^U _eiden that upon formation of a vermufl Kunsj, _Einspr itzzyklus e.ne wedge

^sl ? "- ^Fl J ™ ^S - ⁸ Jl-Aus _{Closure of} the film piece from the

^^ "^" ΐ, ^ ₂₃ occurs.

nspn ^ ffnungc i3 _W : _irmeleitkem e 24 and the DieDmensionL _{preferably in} such a way

^^^^ ch during operation ^ ufAjr Wan-

Its heat-conducting cores 24 are fitted with one with the du «gd ^ feed channel 22 em au ^ ^

Distributor plate 25 of the injection mold sealing mass -. \ ^ F ^ _{k lant} remains and which, as connected end-piece 29 provided, which oes rend The latter Be ^ _{ißkanal. Injection molding} nozzles, for the res at least one each from the feed line 21 in each 40 at the «Ε ⁶ _{s ritzgute} s opposite the

the supply channel 22 opening into bore 30 for the supply ^{th "m} ^ ^hen ^ J _{share dien} t. Further, the Dimenführung having to be sprayed Spn ^ ußmassc for ^u ™ 8 * ^e ™ _r ^e X _rkan AELC 22 also on the viscosity of the injection hole 23 . the overall dimensions and the flow rate depend on

Due to this arrangement of the heating element cores 24 in the ^S P ^ f ^lima _flow rate in turn depends on that of the heated distributor plate 25 and due to the stan- dard, _ v "* u dK L ^ ^. ^ _{Of the h}

dige flow around it with the hot injection molding anzaM de ^ _{d V (jn the} Schußle.stung der

mass they stay hot all the time, they all end in the same place ^ lmg Temperature and cause the injection molding machine aDnang.fe

1 sheet of drawings

Claims (3)

Ben the locking part arranged, then takes place claims: an uneven filling of the mold. From the publication »Plastics« August 1. Multiple injection nozzle for hot runner spray 1965, pp. 50 and 51, is already an arrangement of casting tools with a plurality of injection openings, some of them in 5, for hot runner sprayers Distribution plate and partly known in the die of the casting tools, which have a plurality of one Hot runner ^ injection molding tool arranged, single feed line branching feed channels for having a feed line connected to the injection molding compound and in which the feed ducts for the injection molding channels to be injected through partly in the distributor plate, partly in the mass, characterized in that io die of the injection molding tool provided Aus each Feed channel (22) "a recesses are formed in its interior. over part of its length up to which it is further from the publication by Ernest P. associated injection opening (23) in the form of Moslo "Runnerless Molding" (New York, 1960), The cavity of the injection molding tool already has an injection nozzle for hot denier on pages 58 and 94 Has heat conducting core (24) and that all 15 channel injection molding tools known which one Heat-conducting cores (24) with one another and with the supply channel for the injection molding compound, an injection-heated Distribution plate (25) in the heat-conducting opening and one in the interior of the feed channel, Connected. at least over part of its length coaxial to the 2. Multiple injection nozzle according to claim I, the injection opening arranged heat conducting core, which is characterized in that the Mehrfachein- ao extends into the injection opening, spray nozzle has an axis of symmetry (A) , around which the heat conducting core with the heated Vcrdie around the injection openings (23) is connected to the divider plate of the injection molding tool in heat-conducting cores (24) assigned to them and which are arranged axially directly in front of them. Injection opening part of the supply channel 3. Multiple injection nozzle according to claim 1 25 by one in the die of the injection molding tool or 2, characterized in that the recess provided for heat is formed. Conductive cores (24) as parts of a connecting piece are now attempted with injection molding tools. (31) are formed, which over a, as part of its which in the above-mentioned manner with a Verrie-circumc formed extension piece (29) are provided tightly gelungteil, to secure an equal with the distributor plate (25) is connected, and 30 moderate filling several with one Wärmeleitdaß each the extension piece (29) at least one, the core of the type provided injection nozzles around To arrange the feed line (21) with the supply channels (22) around the locking part, so proves having connecting bore (30). it is particularly the case with small parts to be produced it is extremely difficult to arrange several such nozzles in the small space available,