DE2660375C2 - Plastic injection molding machine for producing injection molded parts with color areas flowing into one another - Google Patents

Description

a) The stationary mold carrier (29,30), which is used as an alternative for normal injection molding by means of a Plasticizing cylinder (21 or 27) formed mold clamping device is fixedly arranged on guide rails (20) on which the movable The mold carrier (17) is displaceably guided;

b) the two alternatively fü. Normal injection molding formed sealant cylinders (21, 27) are arranged displaceably on support bars (26 or 36) of associated injection molding units (I or II) that extend parallel to them and for contact with the injection head (Wa) in the closing direction of the mold clamping device or perpendicular thereto Can be connected to the mold clamping device via the support bars (26 or 36);

c) the spray head (Wa) is part of the stationary mold half (\ f> a) and can be clamped onto the stationary mold carrier (29,30);

d) the injection molding unit (II) to be arranged perpendicular to the closing direction of the mold closing device can be coupled to the mold closing device in the region of the injection head (Wa) via its support bars (36).

2. KunststoftSpntzgießmaschine according to patent claim 1. characterized in that the heatable spray head (Wa) in the closing direction of the mold closing device Geseher., Is limited on both sides in front of insulating plates (1 1; 28)

3. Plastic injection molding machine according to patent Spruch i c ler 2. characterized in that de ' Spray head (1 lay'η the two across the closing th direction of the room which is the same Has dimensions like the stationary Pormhälf-Ie (16a ;.

4. Kürislstoff'Spritzgießmaschine according to one of the preceding claims, characterized in that the _{spray head nozzle (12S -} JdIe gießform * each insulating plate (13) and the stationary mold half (16ajdürchdringt and part of the wall of the

Mold cavity (33, 34) of the injection mold (15a, löaj forms.

5. Plastic injection molding machine according to one of the preceding claims, characterized in that that the inlet sections of the feed channels (31a, 32a) are perpendicular to one another and immediately before it flows into the mold cavity (33, 34) in the central spray head channel (40aJ merge.

6. Plastic injection molding machine according to one of the preceding claims, characterized in that that the plasticizing cylinders (27, 21) are of identical design.

7. Plastic injection molding machine according to one of the preceding claims, characterized in that that the support bars (36) of the injection molding unit to be arranged in relation to the closing direction (II) can be coupled to the guide bars (20) of the mold clamping device.

The invention relates to a plastic injection molding machine according to the generic term of Claim 1.

In the known plastic injection molding machines of this type (US-PS 24 18 856) it is Special machines for the production of marbled sprayings without any other use these injection molding machines or their essential assemblies (injection molding units, mold clamping units and the like), for example for normal injection molding, would be possible. In addition, the Feed channels in the extrusion head at a relatively large distance from the mold cavity, these feed channels are fed from plasticizing cylinders that run parallel or at an angle to one another.

A device for injection molding plastic parts with a smooth surface and a porous core is also known, in which the two different plastic materials for the surface and core are injected from two plasticizing cylinders into an injection mold that is accommodated in a conventional mold clamping device, the stationary of which Mold carrier sits firmly on guide rails on which the movable mold carrier is slidably guided (DE-AS 23 55 458. Fig. I).
In another known device for the production of 7orm bodies with a foam core and a shell made of thermoplastic material, which has an injection head connected to two plasticizing cylinders with a central nozzle for the foam plastic and with an annular nozzle for the thermoplastic material, the central nozzle and the annular nozzle are independent of each other open and closed. The ring nozzle is limited by the spray head and an axially displaceable sleeve, which is guided in the spray head and closes the ring nozzle. A hole in the sleeve forms the central nozzle with a displaceable closing needle (DE-OS 22 59 818).

It is also known to bet the usual injection molding machines which is perpendicular to the closing direction of the mold ' Closing device to be arranged injection unit over

to couple their support bars with the mold clamping device in the area of the injection mold (DE-PS 13 00 201).
Based on the stated prior art

The invention is based on the object of providing a plastic injection molding machine of the type mentioned at the beginning Further develop the genus for the production of color areas flowing into one another in such a way that with it Marbling patterns, especially aesthetically pleasing natural horn imitations, of extraordinary Diversity can be produced and the essential assemblies, such as plasticizing cylinders and mold clamping units can be used as an alternative to normal injection molding.

This object is achieved according to the invention by what is stated in the characterizing part of claim 1 Features solved.

This solution has the additional advantage that the plastic injection molding machine can be used for production of moldings with marbling nests of high quality, by meeting the technical requirements for a maximum approximation of the point of union of the feed channels in the injection head to the mold cavity and at the same time the prerequisites for a rational series production are given, by essential assemblies to the normal Injection molding are usable

Further refinements of the invention emerge from the subclaims.

The invention is explained below with reference to the drawing using a few exemplary embodiments. It shows

F i g. 1 is a side view of a detail from the partially longitudinally cut plastic injection molding machine,

FIG. 2 shows a detail according to FIG. 1 in plan view without vertical injection molding unit

The mold clamping device accommodated by a machine base comprises a stationary mold carrier 29, 30, which is fixedly seated on guide bars 20, and a movable mold carrier 17 with the mold half 15a, which is mounted displaceably on the guide bars 20. The mold carrier 17 is driven via a toggle lever, the arm 18 of which is hinged to the bearing pin 19 of the mold carrier 17. During the injection process, the mold cavity 33, 34 is filled with plastic materials of different colors, which are partially mixed. The stationary mold carrier 29, 30 is penetrated by the plasticizing cylinder 27 of a horizontal injection molding unit I in a passage opening 41. This injection molding unit is medium with support bars 26 in sleeves 38 of the stationary mold support 30? Securing bolt 39 detachably attached Another, identical injection molding unit II with plasticizing cylinder 21 is detachably attached to the guide bars 20 in a vertical arrangement. Injection pressure and injection speed can be controlled over a wide range. The mold cavity .H. 34 of the injection mold 15a. 16a is from the plasticized ν alleviate 27, 21 via a common extrusion head 11 ·? with plastivheni plastic material bes> \, i kbar combiner In it, the plasticizing sii'h two of the nozzles 23, 25 feed channels 21,27 coming jià, 32a to 40a in the central Spritzkopfkanai Spritzkopfdüse 12a. The plasticizing spaces of the plasticizing cylinders 21 and 27, which can be moved onto the injection head Ub , the feed channels 31 a, 32 a and the mold cavity 33, 34 are communicating cavities, which is why the

The spray head nozzle 12a and the nozzles 23, 25 of the plasticizing cylinder 2Ϊ, 27 are nozzles that are free of seals. The spray head 11a, which can be heated by means of an electrical resistance heater 14, is stationary Mold carriers 29, 30 can be clamped, as in particular from FIG. 1 can be seen. The stationary mold half 16a is in turn arranged on the spray head 11a, seen in the closing direction of the mold clamping unit, the spray head is 11a bounded on both sides by insulating plates 13, 28. Its dimensions correspond in the direction transverse to the closing direction extending directions of the space the dimensions of the stationary mold half 16a. So far the injection head 11a can be addressed as part of the stationary mold half 16a. The vertical one The plasticizing cylinder 21 is via its support bars 36 and the coupling elements 10a with their connecting sleeves 35 and securing bolts 37 can be coupled to the guide bars 20, as known from DE-PS 13 00 201 The The feed channel 31a of the plasticizing cylinder 21 initially runs vertically, and then in one direction towards the closing direction to pass inclined channel section, which is essentially within the Sprit ... opfdüse 12a The spray head nozzle 12a penetrates ate with machining for the mold cavity 33, 34 provided plate of the mold half 16a and thus has to the formation of the Wall of the mold cavity 33, 34 part. The feeder. channel 31a opens immediately in front of the mold cavity 33, 34 into the feed channel 32a, the inlet section of which is perpendicular to the inlet section of the feed channel 31a is

The plastic injection molding machine is except the injection head as well as some nozzles made of standardized components (injection molding units and mold clamping devices) which can also be used for normal injection molding machines. The plastic injection molding machine is equipped with an interval switch that controls the axial strokes of the plasticizing screws, through which an intermittent stroke of one plasticizing screw and a non-intermittent stroke the other plasticizing screw or intermittent axial strokes of both that are offset in time Plasticizing screws are controllable in terms of speed and interval measurement.

Normal injection molding, i.e. H. the production of non-marbled, single-colored injection molded parts is after acceptance the injection molding unit II and the Spri'.zkopfes lla and possible after changing the injection mold. Should the injection molding unit II be used solely for normal injection molding or used together with the injection molding unit I for the production of two-tone injection molded parts this injection molding unit II is to be adjusted to the parting line of the injection mold. this gesch ent by loosening the coupling elements 10a end their renewed bracing with the guide bars 20 'τ d «.- r ί racing plane of the injection mold.

Thus, with a machine with the same basic equipment, you can choose between two-tone or two-tone marmoners monochrome spni / lingc are made in the zuet / The case mentioned is alternatively one in the parting line. or cmc across the parting line of the injection mold working injection molding unit available.

The integration of the injection head es 11a in the stationary mold half 16d results in the structural preconditioning for a maximum approximation of the point of union of the feed channels 3Ia ₁ 32a to the mold cavity 33, 34. This increases the quality of the marbling patterns.

For this purpose i sheet of drawings

Claims (1)

Patent claims: 1. Plastic injection molding machine for the production of color areas that flow into one another, in particular Marbling patterns, having splashes in one between a movable and a stationary mold carrier of a mold clamping device clamped injection mold, with a the injection head resting against the stationary mold half of the injection mold, the one in the injection head nozzle opening central spray head channel, which is connected to the sprue channel of the injection mold, and has two feed channels opening into the central spray head channel, each with one Nozzle channel are connected by two plasticizing cylinders lying on the extrusion head, which are separated and injectors that can be controlled at different intervals or with changing pressure differences have and their plasticizing rooms via the nozzle channels, the feed channels and the central spray head channel at least periodically during the injection period (i.e. at the rate of the Intervals or pressure differences) are in open connection with the runner by combining the following features: