RU2294876C2 - Foam feeding device, particularly, isocyanate foam - Google Patents

Abstract

FIELD: polymer handling facilities.

SUBSTANCE: invention relates to device for delivering foams, particularly, isocyanate foam, from closed containers. Proposed device for delivering one of several foam-forming components from closed container has valve and adapter secured on valve. Device contains feed pipe connected with valve, with conversion of channel on end or on section of tube length to be filled with foam-forming component or components when putting device into operation. Conversion is made in form of insert or disk provided with at least two holes.

EFFECT: provision of high output of foam from closed container.

10 cl, 2 ex, 4 dwg

Description

The present invention relates to a device for feeding one or more foaming components from a container. Basically, we are talking about one or two-component polyurethane foam, which is served from an aerosol can.

It is known that such a foaming component can be supplied from the tank by controlling a valve that opens a passage to an adapter mounted on this valve. In this case, the adapter communicates with the feed tube, usually flexible, which allows you to accurately feed the foam to the place of use.

Plastic adapters can take various forms depending on the valve used and have been used for more than 25 years to deliver contents from an aerosol can. Various means of attaching the adapter to the valve have been proposed, but the adapter is usually screwed onto the external thread on the valve. When the adapter is tilted or pushed on, the valve opens and the foaming liquid or liquids exit the adapter to pass through the supply tube attached to it. The tube mount is usually detachable and is usually carried out by friction on the outer or inner surface of the liner. In some cases, the tube is connected to the adapter using threads, teeth or knurling made on the adapter, for example, when it is molded. The feed tube is generally flexible and made of plastic.

Another way to supply a foaming liquid from an aerosol container is to use a spray gun (in the form of a gun). In this case, the adapter and handset are missing. When actuating the trigger of the spray gun, foamy liquid flows out of the barrel of the gun.

Comparative experiments have shown that devices with an adapter and a tube provide foam with a higher density than devices with spray guns.

Professional users who work with 1KPU or 2KPU foam (with one or two components) in bottles or cylinders typically use spray guns and therefore get lower density foam. The physical properties of these substances are different and usually the quality of the foam is lower than that of foams with a higher density.

Individual consumers typically use 1KPU foams and use tube adapters, resulting in higher density foams.

The problem to which the present invention is directed, is to eliminate the disadvantages associated with this difference in density, due to the fact that the user can choose between high density foam and lower density foam. High density foams are used, for example, for fixing window frames. Low density foams serve as a seal or coating material. Their goal is to obtain the maximum amount of foam from one container, that is, from a given volume. In this latter case, we can speak of a higher "exit".

The invention aims to achieve in a simple way a higher yield of foams in a device with an adapter and a tube. In accordance with the invention, the solution of the problem is achieved due to the fact that in the channel of the tube through which the flow of foam passes, narrowing is provided. It is clear that at the narrowing point there is an increase in speed and a corresponding decrease in pressure at the exit of the narrowing. The resulting Venturi effect increases the "foaminess" of the supplied fluid.

Thus, in accordance with the invention, one or more equivalents of a venturi can be created inside the plastic adapter either along the length of the tube of round or oval cross-section or with a liner, for example, in the form of a constriction ring or tubular section in the adapter or, alternatively, in length or at the end of the tube.

According to the invention, an adapter that provides a “high yield” and is provided with a liner and a tube or not using them can be screwed onto the external thread on the valve in a known manner. The inner diameter is usually at least 1 mm to ensure minimum flow at different container temperatures. In general, for foaming polyurethanes, the adapter and tube have an inner diameter of about 6 mm.

The narrowing can also be in different parts of the channel of the tube that conducts the foam, and have, for example, a ring.

In the best case, the Venturi effect is achieved in a simple way by installing an insert at the end of the tube having an opening with a diameter of 1 to 5 mm. The diameter of this liner determines the final density of the foam. According to another embodiment, the liner is provided with several smaller openings. The liner can be installed in a tight fit, glued or screwed.

It was found that when using the device, providing a "high yield" according to the invention, the output is 30% higher than with a known device with an adapter and a tube.

According to another mentioned embodiment, the adapter is made in the form of a ring, which is a disk with a certain number of through holes, preferably round, and mounted across the channel of the tube. Thus, instead of one hole in it, from 2 to 20 or more holes of smaller diameter are made, which can be from 0.1 to 2.0 mm, preferably from 0.3 to 1.8 mm, and even more preferably from 0.5 up to 1.5 mm. The implementation of several holes was effective in relation to the output parameter, which in this case can increase by 30%.

The following benefits were also identified:

- a more uniform and more easily adjustable output of the foam mass;

- less significant subsequent expansion of the foam during hardening;

- faster curing of the foam even at a container temperature of + 5 ° C and an ambient temperature of -10 ° C;

- less subsidence of freshly applied foam in the transverse direction.

Examples

1) Insert No. 1, located at the end of the adapter tube made of plastic, with a normal installation angle (45 °)

Tube inner diameter 6.8 mm Liner inner diameter 3.0 mm

Foam was used based on the standard OCF commercially available and designed for cylinders with an adapter.

Adapter with standard tube type:

Foam density 30 g / l 750 ml foam bottle capacity 25 l

An adapter with a "high output" tube according to the invention:

Foam density 21 g / l 750 ml foam bottle capacity 36 l

2) Insert No. 2, located at the end of the adapter tube made of plastic, with a normal installation angle

Tube inner diameter 6.8 mm Liner inner diameter 2.0 mm Foam density 20 g / l 750 ml foam bottle capacity 37.5 L

Thus, the present invention allows to obtain:

- a device for producing foam with a controlled reduction in the final density of the foam by about 30% compared with the known, commercially available devices for aerosol foam of one or two components;

- a device for producing foam, providing an increase and regulation of the yield of foam by about 30% compared with the known, commercially available devices for aerosol foam of one or two components.

Figure 1 depicts a device in accordance with the invention in the first embodiment. In the drawing, as an example, a well-known adapter 1 is schematically shown, which is designed to be mounted on the valve of an aerosol container 7 and contains an insert 2 for attaching tubes 3 of various lengths, usually from about 15 to 20 cm. Tube 3 is shown in longitudinal section, with the end the tube has a round hole 4 of a reduced cross section, which is obtained by inserting the insert 5 with force into this end. The liner contains a single central circular hole. In a known manner, the adapter contains a lever 6 to facilitate tilting the valve body ("swing valve").

Figure 2, in a top view and in longitudinal section, shows an insert according to one embodiment. The insert 5 is provided with five holes 4 and teeth 9 for fixing the insert inside a flexible tube, which is not represented. At the end of the liner 5 there is a shoulder 8.

Figure 3 shows a liner in another embodiment. It contains eight holes distributed in a particularly efficient manner. The holes have a diameter of 0.7 mm, the liner has a length of 12-13 mm, an outer diameter of 6.35 mm and an inner diameter of 5 mm. The diameter of the shoulder 8 is 7.5 mm

Figure 4 shows the liner in another embodiment, having thirteen holes.

As an additional example, with respect to hole sizes 4, it can be indicated that in a disk with seventeen or thirteen holes, the holes have a diameter of 0.7 mm, and in a disk with five holes - 1 mm.

One skilled in the art will recognize that the foaming components of the invention are not limited to polyurethane foams or other synthetic foams. The invention may also relate to non-polymer chemicals, cosmetics or food products (creams, sauces), which may take the form of a foam mass.

Claims (10)

1. A device for supplying one or more foaming components from a closed container equipped with a valve and an adapter fixed to the valve, comprising a delivery tube connected to the specified valve, at the end or at a section along the length of which a narrowing of the channel filled with the foaming component or components during bringing the device into action, characterized in that the narrowing is made in the form of a liner or disk having at least two holes. 2. The device according to claim 1, characterized in that the number of holes is selected in the range from 2 to 25, preferably from 5 to 18. 3. The device according to claim 2, characterized in that the number of holes is 8. 4. The device according to claim 1, characterized in that the narrowing is formed by a liner or a tubular section, the inner diameter of which is less than the inner diameter of the tube, and the outer diameter is equal to or slightly larger than the inner diameter of the tube. 5. The device according to claim 4, characterized in that the liner or tubular section contains an outer surface with teeth, contributing to adhesion to the inner surface of the plastic tube. 6. The device according to claim 1, characterized in that the diameter of the holes is from 0.3 to 1.6 mm, preferably from 0.6 to 1.2 mm. 7. The device according to any one of claims 1 to 6, characterized in that one or more of the components are polyurethanes. 8. An insert adapted to be used in a device according to any one of claims 1 to 7, having at least two openings for forming a narrowing of the channel to be filled with a foaming component or foaming components during actuation of the device. 9. A system containing a cylinder with a foaming product, an adapter and a set of supply tubes, characterized in that the supply tubes are equipped with constrictions having different sizes in different tubes, made in the form of inserts according to claim 8. 10. A set of different inserts according to claim 8, each of which is configured to be installed at the end of the supply tube for supplying one or more foaming components.

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