DE1779381C - Device for the production of spheres from heat-foamable plastic masses with a low mass density - Google Patents

Description

This training ensures that the spherical

The invention relates to a device for cleaning prior to use in a simple manner prior to manufacture can be expanded by beads made of heat-foamable ao.

Plastic masses with low mass density with An embodiment of the device is according to

one described by a horizontal or approximately horizontal following with reference to the drawing. In the

Axis swivel kit for recording and drawing is

rotating locomotion of the globules. F i g. 1 shows a front view of the device with

In order to achieve a uniform expansion of the spheres as a rotatable, heatable pan,
to achieve in a mold space and precisely shaped F i g. 2 the device according to FIG. 1 to create side objects has already been proposed, view in partially broken representation,
the beads partially removed from the mold. 3 is a diagrammatic representation of a stretch. The mold is then essentially filled with suction means for removing the partially expanded or partially expanded beads, and the 3 <> beads from the pan according to FIG. 1 and
Stretching or foaming wiro. by further F i g. Figure 4 completes a diagrammatic representation of heating in the mold. Overflow arrangement to remove the partially expanded globules from the pan of FIG an axis; st, the latter of which processes a drying stage before the pre- in any desired acute angle to the expanded beads can be used. Vertical is adjustable. A feed pipe 11 is used. Such suggestions arise, for example, from the German Auslegeschriften 1134 504 and 1183 237. chen to the pan for feeding unexpanded plastic balls.

Lightweight molded articles such as 40 F i g. 1 and 2 show a drive motor 12 with Containers, toys and insulating layers in cooling and variable speed for rotating the pan 10 by one Freezers as well as ii · truck and trailer axles 13. The location of the pan and the drive body, as is well known, are created by ball assembly being able to rotate at various angles Chen, pearls or tablets made of plastic compound connect a peg 14 through in curved slots 16 gene or mixtures can be set with a 45 sliding pin 15 incorporated therein. The pan 10 Propellant activated by heat in the Her- is thermostatically controlled heating coils 17 Position form can be expanded or foamed. heated in an air chamber 18 through which an air-such Plastic masses can be polystyrene, polystyrene can be blown by means of a blower 19, (alkylstyrenes), poly (vinyl chloride), poly (vinylidene to achieve a more even distribution of heat), Hold poly (acrylic and methacrylic esters), mixed poly 50.

Merisate of styrenes, alkyl-substituted styrenes in a tube 20 represents the suction end of a suction mixture with one another and with divinylbenzene, a device which is shown in FIG. 3 a collecting butadiene or acrylonitrile and also mixtures der- box 21, which include through a pipe 22 with a type of polymer and copolymers. (not shown) suction pump is connected. The propellant can be a volatile aliphatic or desirable, devices for adjusting the cycloaliphatic hydrocarbon and at the receiving end of the tube 20 in addition to, for example, petroleum ether, pentane, hexane, heptane, separation point of the partially expanded spherical cyclopentane, cyclohexane, cyclopentadiene or to provide a mixture of these in the pan. The propellant can be F i g. Fig. 4 shows another arrangement in which the roughly 3 to 1½ percent by weight of the globule-wise expanded globules from the rim of the pan make up the mass. The expandable spheres that flow through heat or flow into a container or box 23 can be round, pillow-shaped. Fixed rakes or scratches can be designed next to or irregularly. The bottom of the pan between the loading point and the delivery point of such a type are able to be arranged to increase the circulation of the and, if they are used directly for forming 63 spheres and the adhesion to the pan, initially less than 10% of the too filling decrease. The adherence of the globules can also take Ra .Mes. This tends to reduce or prevent the globules from expanding uniformly by coating; the surface of the pan and any rakes,

Scratches or blades that hold the beads with a non-stick plastic coating, for example polytetrafluoroethylene.

The following table shows the results obtained by partially expanding commercially available foamable polystyrene beads to a density of 0.3b g / cm ³ in an apparatus of the type illustrated in the drawings under various operating conditions.

Ver
search Angle of
Axis with
the
Verticals
O Tempe
rature
in the
pan
O Circumferential
swiftly
age
the pan
(m / min.) Density of
extensive
Little pebbles
(g / cm ³ ) I.
2
3
4th
5 16
16
16
16
45 87.9
87.9
99
110
87.9 3.44
1.295
1.295
1.295
3.44 0.12
0.0784
0.0464
0.0352
0.0688

The table shows that a range in the densities of the Kire expanded beads of over three times the SSSS KOgeihen was obtained. The experiments 1 andTSgen the action of various rotational speeds the pan to the density, m blown Status; Experiments 2, 3 and 4 show d, c exposure to different temperatures; and the Vergehe 1 and 5 show the effect of different angles of the axis of rotation. .

The operating conditions can be easily adjusted are to adapt the mode of operation of foamable beads of various composition and pre-expanded To produce beads in a wide range of dimensional densities. There is a great deal an inherent self-regulation in the way of working the device because the globules, the lower the density and the larger the size of each Bead, the faster ..to the upper part The globular mass in the pan increases and the faster it can be removed by overflowing or suction: will.

1 sheet of drawings

Claims (1)

1 2 the material at the top of the forming space Claim: can, for example, be subject to greater expansion his and, as a result, a lower density Apparatus for producing beads from having as the material in the lower part of the heat-foamable plastic mass with less 5 mold space, in particular because the expanded dimensional mass density. Is a good insulator around a horizontal or material and has the tendency to isolate the almost horizontal axis of the swiveling construction - not yet expanded material and to prevent its complete expansion, set for the absorption and rotating movement,
the spheres, thereby ge ken η ze ich- The invention is based on the object of creating a net that the kit consists of a circular, io device of the type specified, flat pan (10), soft rotatable by the disadvantages The previously known Emnchtun a central gene that cuts the bottom of the pan, in particular the use of steam, is mounted axially. be avoided. This task wire. ' according to the invention thereby ge-15 solves that the kit consists of a circular, flat one Pan consists, which can be rotated around a central, the Bottom of the pan intersecting axis is mounted.