DE900386C - Process for the production of thin-walled objects from thermoplastic compositions and the object produced according to this - Google Patents

Description

Process for the production of thin-walled articles from thermoplastic Masses and items manufactured according to them The method exists according to the invention therein, thin-walled objects, in particular plates, cans or the like. Such from thermoplastic masses, primarily by injection molding, produce that z. B. the thin-walled bottom of a plate made of a certain color and the thin-walled edge as well as the decorations on the bottom of the plate coming from another. Color exist, can be added later. In this case, the thin-walled parts at each end are e.g. B. in the injection process without special Aids are firmly connected to each other, so that Idas have been so far usual, considerable increases in price causing fusion, gluing or the like of the individual colored, thin-walled Parts are avoided with each other.

The procedure is carried out e.g. B. such that to produce one from thin-walled object consisting of several colors first the thin bottom in a certain color, e.g. B. red or black, by pressing or spraying thermoplastic mass is produced, whereupon dileser thin-walled floor in a corresponding Spritzmatri ze used, and the other colored, z. B. white or green, thin-walled edge of the plate injected around the colored compact is that this includes on the circumference downward from a circumferential edge bead and is enclosed upwards by the lower edge of the border. This will the pressed part completely encompasses the periphery of the subsequently injected edge, so that a firm connection between the thin-walled bottom and the also thin Edge is achieved.

To tear, e.g. B. on the edge of the plate, to avoid the thin soil expediently heated to about 1500 before it is encapsulated by the edge. This largely compensates for the temperature differences. E can too in this single injection process on the inside of the compact (bottom) ribs, Rings or other decorations or reinforcements be sorted, which in turn have the color of the outer edge or the last spray.

When using several thin-walled individual parts in different Colors are made, it is appropriate to use the preforms z. B. with conical to provide formed edges, which are lined up in a self-clamping manner, so that a hold of the individual parts is guaranteed. Because the Pressed part is preheated during overmolding with the thermoplastic mass, there is an automatic connection of the parts by at the contact surfaces Fusion or sticking occurs on the surface of the thin-walled parts. Instead of a pressed part (bottom or the like), several different colored, thin-walled individual parts one after the other according to the above method in the injection molding process be connected to each other.

With this method it is achieved, a thin-walled object, in several colors, especially by spraying, without additional funds and without reworking.

Although it is known to make objects from different, in particular produce multicolored parts, however, using the known methods must be extremely thick-walled, otherwise the individual parts will tear. These processes also require extremely complicated machines, what makes it very expensive to manufacture.

These disadvantages are eliminated by the method according to the invention, by which the manufacturing process is made simple and cheap and articles with thin wall thicknesses, such as plates, cans or the like in particular, without tearing of the individual parts can be produced.

An exemplary embodiment is shown in the drawing, namely Fig. 1 shows the plate produced according to your process in elevation in section, Fig. 2 is a plan view of the plate, Fig. 3 is an elevation view of the pressed part, Fig. 4 the compact in plan in view.

The thin-walled object consists, for. B. designed as a plate, from the thin bottom a made of thermoplastic masses, which is pressed or Sprftzrerfahren is manufactured (Fig. 1 and 3).

Around the circumference of the thin bottom a is made of thermoplastic masses manufactured edge b, which also has only a thin wall thickness, injected, in that the bottom a is appropriately inserted in the preheated state in the injection mold and then the thin edge b is injected around the bottom a, the circumferential Edge c of the bottom a encompassed from below by the bead d of the thin-walled edge b and is enclosed from above at e by the inside of the edge b. Through this is a solid connection between the thin-walled floor a and the thin one Edge b scored.

At the same time, a depressions can also be made in the upper end face of the base f be arranged, in which also during the injection process for the edge b thermoplastic compositions for the formation of decorations i od. The like. Injected. Furthermore, in this spraying process, 0 rikige can also be placed on the floor at the same time g, struts h or any other ornamentation can be produced.

Hereby it is achieved, thin-walled objects with different To train colors by z. B., as in the present case, the thin-walled floor a made of red mass and the likewise thin-walled edge b as well as the rings g, struts h and decorations i can be made from 'white matter, with the parts a and b are firmly connected to one another without the use of special tools.

In the same production method, other, arbitrarily designed thin-walled objects, such as cans or other hollow bodies made of various Colors exist, are produced.

Claims (4)

PATENT CLAIMS: I. Process for making thin-walled articles made of thermoplastic materials, the individual parts of which are thin-walled and in different colors are, characterized in that it consists of a thermoplastic material thin-walled part (floor or the like.), which is expedient in the preheated state in the Injection die is introduced, a further thin-walled part (edge) by means of, thermoplastic mass is injected, with the two or more one behind the other exposed parts without special fasteners in the spraying process are connected with each other and continue in the same. Spraying method on the floor or lower part rings, struts or any decoration made can be. 2. Thin-walled, thermoplastic made from multiple colors Object such. B. plate, can, container or the like., Characterized in that the circumferential edge (c) of the part (a) of the injection molding compound of the thin-walled injection molded The edge (b) by passing from below through the; Bead (d) of the edge (b) and of is enclosed at the top by the inside of the rim (b). 3. Article according to claim 2, characterized in that in the Injection process at the same time the Vertliefungen (f) arranged in part (a) arbitrarily designed ornaments (i) or the like. Be filled in and continue to the part (a) rings (g), struts (h) or the like. Are arranged. 4. Object according to claim 2 and 3, characterized in that the circumferential thin-walled edge (c) of the 'part (a) and the edges of the depressions (f) or the like. Are conical.