DE1904763U - DEVICE FOR THE CONTINUOUS MANUFACTURING OF RESIN FOAM. - Google Patents

Description

BADISCHE AMIIH & SODA FACTORY.

Our reference: G-M 558 Sa / La Ludwigshafen am Rhein, September 17, 1964

Device for the continuous production of synthetic resin foams open

Devices for the continuous production of synthetic resin, foams from solutions of curable synthetic resins. z., B. Urea-formaldehyde condensates ₃ by mixing the synthetic resin solution with a foamed foam solution and hardening the resulting synthetic resin foam are known a pressurized gas can be injected and converted into a foam by vigorous stirring ». The synthetic resin solution is then fed to this foam at a point closer to the container outlet (German patent 813 598).

Modifications of this device are e.g. * with two separate Equipped stirred tanks, wherein the foam can be generated in the first tank and. this, in a second container the Synthetic resin solution is admixed (German patent 800 704). It is also known to provide the container provided for foam generation with a frit. Through which the gas enters the Foam solution is injected (German Auslegeschrift 23/64 1 170 615).

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These devices require a relatively large size Required space and also an equally complex mechanical Drive. They are therefore used for foam production at any Places not particularly suitable.

Devices are also known in which foam concentrate solution and resin solution can be separately atomized with pressurized gases, and then these atomization products are brought together (German patent 734 094).

In another embodiment of these devices, a Foaming room filled with glass balls into which the Foam concentrate solution can be dusted. In the so generated Foam then becomes the Har2 solution in a downstream mixing chamber injected (German patent 1 043 628).

While these apparatuses are more handy, their performance and the physical properties of the foams produced, in particular the density, however, are determined by the dimensions of the atomizing nozzles and can only be varied within narrow limits. The nozzle sets must be exchanged for changes in performance. Furthermore, these devices are because of the small nozzle bores, which are inevitably required for good atomization, prone to failure. So, for example, through not carried out, cured foam residues or impurities in the output components disturbances are caused, which a require time consuming cleaning of the device.

The present invention is a particularly advantageous one Device of this type. It consists of a tubular

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Vessel (1) for preparing the foam from the show agent solution, a tangential feed (2) for compressed gas on its inlet side and an axial feed (3) for foam agent solution are attached, and on its outlet side which is reduced in diameter there is a preferably spirally wound tube (4), which is near the end of the tube with a feed (5) for synthetic resin solution is fitted into the foam. If necessary, internals (6), e.g. Baffles, perforated disks or large-meshed sieves are attached to prevent the rotary current that is predominantly present in the upper part of this vessel of the foam in a predominantly axially parallel flow in the downstream pipe The pipe downstream of the tubular vessel can be exchanged for pipe sections of other lengths or »number of turns * With this Device can use synthetic resin foams in - in the unit of time changing quantities and different densities continuously, also produced directly at the place of their subsequent use will.

The following is the operation of the device according to the invention explained in more detail * The gas tangentially supplied to the vessel (1) at (2) creates a negative pressure zone near the axis of the vessel * The in this. Zone, axially supplied through the supply line (3), e.g. with a pump, if necessary, the hardener for The foaming agent solution containing the synthetic resin solution is released by the gas flowing circularly along the wall of the vessel detected and due to the caused by the different tangential and axial flow speeds of the components Vortex formation converted into a coarse, foam «by the rejuvenation at the end of the vessel and any

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brought axially parallel guide plates and the like »(6) the rotational movement of the coarse foam prevented and largely converted into an axial movement * In the downstream, expedient spirally wound. Tube (4) turns the coarse foam into one fine-pored foam transforms ™ If then shortly before it emerges from the pipe, its length corresponds to the desired volume density of the foam can be selected, the synthetic resin solution is fed to the foam through the line (5), e.g. without or with the use of a gas dusted into the foam or .dosed in some other way, mixed., the synthetic resin solution With. the foam from the foam concentrate solution quickly, and the foam is set by the instant. Hardening of the synthetic resin increasingly solidified «. The one made in this way, not yet Cured foam can be used directly through a hose (7) connected to the end of the pipe section «Compared to known devices, the new device offers significant advantages * It is small and light transportable and still enables the production of very large amounts of foam. o One made of plastic, e.g. polyvinyl chloride or polyethylene built such device., with the up to 20 m of foam can be produced per hour only.a.weight of approx. * 9 kg »The device is maintenance-free, since they have no moving parts subject to wear, e.g. Stirrer- ^., Contains * It is not equipped with fine nozzles or other tending to clogging. the built-in components * those in the time unit is the amount of foam to be generated with the device, without parts of the device having to be replaced, only by changing the amount of raw material added, variable within wide limits »The density of the foam produced can also by suitable choice of the downstream pipe section

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I? as well as by varying the amounts of gas and synthetic resin ^v

solution to a large extent "influenced.

Claims (1)

- 6 - GM 558 Protection claims fi629i8 * i9.9.6 ₄ ^Λ * Device for producing synthetic resin foams from solutions of curable synthetic resins by mixing a foam from one with one. Compressed gas foamed foam solution with a synthetic resin solution and hardening of the resulting synthetic resin chaum.es- :, characterized by a tubular vessel for preparing the foam from the foam solution, on the inlet side of which a tangential feed for compressed gas and an axial feed for foam solution are attached and on its. Reduced in diameter output side is a preferably spirally wound tube, which is near the end of the tube with a feed for. the resin solution is fitted into the foam. 2 * Device according to claim 1. ₃ , characterized by installed in the tapered part of the tubular vessel, suitable for converting a rotary flow into a predominantly axially parallel flow. 3. Device according to claims 1 and 2, characterized by replaceable pipe pieces, preferably spirally wound, which can be followed by the vessel for preparing the foam. BADIAN ANILIK-. & SODA-PABiIIK AG Sign.