DE1051882B - Container made of nylon or a similar plastic material by injection molding and under internal pressure, in particular for receiving and spraying aerosols - Google Patents

Description

GERMAN

The invention relates to a manufactured from nylon or a similar plastic plastic by injection molding, pressurized containers, in particular for absorbing and spraying aerosols.

The invention is essentially based on the object, in containers of this type with the least possible Cost of materials while maintaining sufficient strength to create security against that when the internal pressure takes over, z. B. by the action of heat, the container wall tears open on all sides and damage is caused by fragments being thrown off.

To solve this problem, it is important in the invention that the wall of the container one that is less resistant to internal overpressure due to the appropriate cross-sectional design Has surface part that forms a safety valve. To this end, the wall of the container instructs one point of its circumference a lesser strength than in the adjacent and opposite rest Area on.

When differentiating the cross-section of the container wall, it was assumed that an internal overpressure practically does not appear suddenly, but can only develop gradually. As a result, the wall part, which has a weaker cross section, will initially only inflate hardly noticeably. As the internal pressure rises, the elasticity of the material will ultimately result in a Form a bubble that gets bigger and bigger until the rupture point is reached and the bubble bursts Overpressure provides a way out. It is essential that the bursting occurs at the apex the bladder takes place without the wall parts surrounding the tear point splintering and being thrown around will.

If a container designed according to the invention is picked up for use, the can Users can immediately tell by the beginning or already existing bloating that something is not in Is okay. In most cases he will instinctively let go or drop the container. But even if this does not happen, the more and more inflated wall bubble will be around in yours Push aside the area of lying fingers and remove the tear point that forms at the apex of the bladder keep away so that there is no risk of injury to the user.

According to a further feature of the invention, the container can be spaced on its circumference arranged from one another, distributed in the direction of its longitudinal extent and over the greater part thereof Be provided with beads that are made in one piece with the container wall.

Made of nylon or something similar

plastic plastic by injection molding

Manufactured container under internal pressure, in particular for receiving

and spraying of aerosols

Applicant:

Robert Henry Abplanalp,
Bronx, NY (V. St. A.)

Representative: Dr.-Ing. PK Holzhäuser, patent attorney,
Offenbach / M., Herrnstr. 37

Claimed priority:
V. St. v. America June 9, 1954

Robert Henry Abplanalp, Bronx, NY (V. St. A.)>,
has been named as the inventor

These longitudinal beads not only have a stiffening purpose, to increase the wall thickness in order to save material generally to be able to keep it as thin as possible and an additional reduction in strength compensate for by the wall section serving as a safety valve, but also serve to Spray the container wall to ensure adequate flow of material into the mold.

In connection with such beads the advantageous one Given the possibility of serving as a safety valve wall part between two adjacent To lay bulges and in this way to confine them reliably.

As tests have shown, it is advisable to determine the cross-sectional areas of the beads and those in between To bring wall parts into a certain mutual relationship in order to minimize a container Wall thickness, but sufficient strength with a minimum of material in the injection molding process to produce, and it has been shown that an optimal effect is achieved if the sum of the cross-sectional areas of the wall parts between the beads IV2-3V2 times as large is like the sum of the cross-sectional areas of the bulges lying in the same plane. The cheapest in each case Dimensioning depends on the size of the container.

809 768/113

Various embodiments are possible for the design of the container and the arrangement of the beads. So the container can be attached to different Make its height have different sized cross-sections, the size ratio maintained between the sums of the cross-sectional areas of the wall parts and the beads in the specified sense remain.

Furthermore, the number of beads is arbitrary and their distribution over the circumference of the container can take place at equal mutual intervals.

The container can have a constant or a tapering circumference in the direction of its height have, where in the case of the tapered container shape, the beads may also be conical in shape can.

The inner and outer surfaces of the container wall can be parallel and at the same time eccentric to one another get lost. In this way, a weaker wall zone that serves as a safety valve is formed in a particularly simple way.

Finally, the usual outlet nozzle in such containers after the imaginary extension of the as Safety valve provided wall part be directed towards so that the blowing out of the container contents takes place from the safety valve in the blow-out direction of the nozzle, i.e. mostly away from the user.

Further details about the container design and in particular about the training to be used Injection mold results from the description below and from the drawing the several exemplary embodiments are shown schematically.

1 and 2 show a container designed according to the invention in longitudinal and in cross-section;

3 and 4 are longitudinal sections of modified embodiments, and

FIGS. 5 and 6 illustrate an injection mold in vertical longitudinal section and in plan for the production of several containers.

In the example of FIGS. 1 and 2, the inner surface is i the wall 1 of the upwardly tapered in the peripheral container eccentrically with respect to the parallel outer surface o. As a result, as Fig. 2 shows a relation to the remaining wall region of weaker wall portion t, the in the sense of the invention represents a safety valve through which the contents of the container are blown out when the internal pressure becomes too high.

The inner surface i of the container wall is covered with longitudinal beads 2 which are arranged at the same distance from one another and which are cast in one piece with the wall and can optionally also taper upwards. As FIG. 2 shows, the wall part t is delimited by two adjacent beads 2.

The sum of the cross-sectional areas w of the and parts located between the beads 2 is, depending on the circumference of the container IVa to ßVamal, as large as the sum of the cross-sectional area b of the beads lying in the same plane. On average, this size difference is 2 to 3 times. In FIG. 2, the cross-sectional areas b of the beads are shown in full black and the cross-sectional areas w of the wall parts are shown hatched.

The valve device 5, which is connected to the usual immersion tube 3 and arranged in the container neck 4, has an outlet nozzle 6 which can be operated by finger pressure, the mouth 7 of which points in the direction of the wall part t serving as a safety valve, as can be seen from FIG. 1, so that the container contents can be blown out the wall part t bursting open as a bubble takes place in the same direction as in the case of the nozzle 6, 7.

At the lower end, a flange 8 is cast on the container, which is no longer used for fastening a illustrated soil is used.

The number of beads 2 is arbitrary and depends on the size of the container. Also the way they are arranged can be different.

While in the example of Fig. 1 and 2 by continuous and extending longitudinal beads are provided over the greater part of the container wall, in the example of FIG. 3 two longitudinal beads 2α and 2 b in a row and according to Fig. 4 offset from each other eye is assigned.

Furthermore, the bulges can be located on the outer surface of the container wall instead of on the inner surface and may also be absent, because in the construction of the container according to FIGS is, only then the wall would generally have to have a thicker cross-section, with the exception of the wall zone t.

Otherwise, the configuration of the container wall is not limited to the eccentricity between inner surface i and outer surface 0 shown in FIGS. 1 and 2; has the rest of the wall and can thus fulfill its function as a safety valve.

The injection mold shown in Fig. 5 and 6 is in adaptation to the peculiarity of the invention Set up the container as follows.

In the drawing, not all details of the mold structure, but only the features are illustrated, which are of importance for the invention.

The section through the molded parts 9, 10 according to FIG. 5 shows one leading to radial transverse channels 12 Sprue 13. In practice it is convenient and economical to cast four containers at the same time, and therefore four such transverse channels are provided at 90 ° to each other, although if desired also a different number of workpieces cast and a corresponding number of transverse channels available can.

The transverse channels 12 do not guide the material directly into the cavities intended for the workpieces Form, rather open into circular channel branches 14. Each of these annular channels 14 has radial branches 15 which lead to the casting cavities 16 of the molded part 9. The molded part 10 has Cores 17 which protrude into the casting cavities 16 when the mold is assembled. These kernels are for the casting of containers according to FIGS. 1 and 2 arranged eccentrically to the casting cavity, as FIG. 6 shows. Everyone The core is provided with several longitudinal grooves 18 which form the various radial branches 15 are directly opposite and form the wall bulges of the container. The radial branches 15 are connected to the flange 19 of the Gießhöhlungen by narrow channels 20, so that after the molding, the finished container can easily be broken off from the externally attached garbage.

The channels 12, 14 and 15 lie in the parting plane of the molded parts 9, 10 and are proportionate in cross section dimensioned large, so that the material from the sprue 13 continues quickly and into the relatively narrow cavities 16 can flow around the cores 17, the grooves 18 on the cores

support material flow. The venting of the casting cavities can be done in the usual way through the channels 21 take place.

The four container bodies come together with the material located in the various channels in one piece from the mold, but can easily be at the locations of the narrowed grooves 20 break off the waste material that is reheated and reused for later casting operations can be.

The injection mold can of course be made according to the particular design of the container and distribution the wall beads are executed modified. So z. B. the grooves 18 instead of the core 17 be arranged in the wall surface of the Gießhöhlungen, in the event that container with on the outer surface the wall located beads are to be poured.

It is known per se to use the injection molding process to produce parts made of nylon with a very small wall thickness and to choose a diameter of half to one for the main channels in the mold Thirds of the material thickness of the injection molded part and does not exceed 10 mm. In contrast is in the injection mold according to FIGS. 5 and 6, the new and progressive in connection with the basic idea of the invention in the special arrangement and design of the sprues seen.

Claims (10)

Patent claims: 1. Made of nylon or similar plastic material by injection molding, under Containers under internal pressure, in particular for receiving and spraying aerosols, thereby characterized in that the wall has a lesser thickness at one point (i) of its circumference than the opposite part of the wall adjacent to this point and the wall part forms a safety valve with a smaller cross-section. 2. Container according to claim 1, characterized in that it is integral with the wall, on its circumference spaced from each other, in the direction of the height of the container and is provided with beads (2) extending over the greater part thereof. 3. Container according to claim 2, characterized in that one between two adjacent Bulges (2) lying wall part has a thickness which is less than the thickness of the between the other beads (2) located wall parts. 4. Container according to one of claims 1 to 3, characterized in that the sum of the cross-sectional areas (w) of the wall parts IV2- to 3V2 times as large as the sum of the cross-sectional areas (b) of the beads lying in the same plane (2) is. 5. Container according to one of claims 1 to 4, characterized in that it is at different Set its height has different sized cross-sections, the size ratio being the Sum of the cross-sectional areas of wall parts and beads lying between the beads (2) (2) according to claim 4 is retained. 6. Container according to one of claims 1 to 5, characterized in that the beads (2) in equidistant from each other on the circumference of the container. 7. Container according to one of claims 1 to 6, characterized in that it has a direction its height has a tapering circumference and correspondingly conically shaped beads (2). 8. Container according to one of claims 1 to 7, characterized in that its interior and Outer surfaces run parallel and eccentrically to one another. 9. Container according to one of claims 1 to 8, characterized in that it has an outlet nozzle (6, 7) directed towards the imaginary extension of the wall part with a smaller thickness (t). 10. Injection mold for the production of containers according to one of claims 1 to 9, characterized characterized in that the sprue channel (13) with the casting cavity or cavities (16) through its cross section Crossing channels is connected from one of the sprue channel (13) radially into one the core (17) at the lower end at a distance surrounding the annular channel (14) leading channel (12) and from a plurality of channels (15) which lead radially into the casting cavity from the annular channel and from the radial channels running longitudinally on the core (17) or on the wall of the casting cavity (15) consist of grooves (18) opposite the annular channel. Considered publications:
"ModemPlastics" magazine, 29 (1952), 9, pp. 101/108, 192. 1 sheet of drawings 809 768/113 2.59