DE2436553A1 - REFRIGERATOR - Google Patents

Description

The invention relates to refrigerators, and in particular to such refrigerators, the rear wall thereof (and possibly also the side walls and the top) generally a rigid inner layer (e.g. made of aluminum) and an outer one. Lamellar layer (e.g. consisting of a polythene or aluminum foil), which is internally with Are connected to each other with the help of insulation material.

This material, generally polyurethane material, is called a foam in the by The space formed in the inner and outer layers mentioned is injected and subjected to a suitable heat treatment firmly glued with dun mentioned layers to make a monolithic To achieve consistency so that the wall of the cooling

509809/0300

PHN. 716S>.

to make the barrier self-supporting.

One for making one of these

The most important method of the type of refrigerators is described in Italian patent specification No. 760 578.

Around the space originally formed in dom by the inner and outer layers to escape from this space if the insulating

injection material is injected, it has been customary up to now to drill a number of holes of relatively large diameter in the outer layer. For example the number of holes was fifteen on each square meter of the wall and the holes had a diameter in the wall In the order of 3 »5 to 4.0 mm.

The vent through these holes was

Undoubtedly satisfactory, but precisely because of its size of the holes, the holes could bubble when the insulating material was injected.

Such bubbles sticking to the gauges in which the mentioned layers during the injection and subsequent heat treatment of the insulation material had to be pinched by the gauges and from the free surface of the outer lamellar layer at the end of the manufacturing process with a large Effort and high costs of material and time can be removed.

The applicant has studied the method and made an improvement in refrigerators from the above

509809/0300

PHN. 7169. 24-6-197 ^ ·

Type elaborated, with no longer such bubbles been formed.

The invention is characterized in that refrigerators of the type in which at least the rear wall contains a rigid inner layer and an outer lamellar layer, which layers using an as Foam mass injected insulation material through a heat treatment in the room, which is achieved by the mentioned, made of an outer lamellar layer with high porosity existing layers are bounded together.

On the basis of an example which does not limit the invention, an example according to the invention is described below Embodiment described.

In one according to the method described in the above-mentioned Italian patent specification No. 7 ^ 0 578 manufactured refrigerator are in the foil of polythene or aluminum paper, which the outer layer of the Forming the rear wall, a plurality of holes or an equal number of slots are provided.

The dimension of the mentioned holes, i.

the diameter, if round holes are concerned, or the width, if slits are concerned, becomes such take care that any blistering on the outer Layer of the wall is tied. Theoretical or empirical is it possible to have such abinc; To determine fungi v. oliei with the viscosity of the injected foam mass,

509809/0300

PHK. 71ό5 ?. 24-6-197 ^ 1.

with the pressure and with the injected Schaununenge pro Second is counted.

Only beispielsA \ 'oise could be assumed that the arrangement of about 300 ... 500 slots per square meter of the wall is practical, each slot of about 1.5 mm has a width of about 0.5 mm and a length. This means that the space into which the insulation material is injected is vented that is still better than the few relatively large holes that have been used so far, which largely suppresses the occurrence of bubbles and thus the manufacturing costs for a refrigerator and maintenance costs for the Lohren are greatly reduced.

Of course, it will be possible for experts to use further embodiments according to the To elaborate the invention without departing from the scope of this invention.

509809/0300

Claims (2)

PHN. 7169th 24-6-197 ² +. τ 5 PATENT CLAIMS .. 1J refrigerator, characterized by »that at least the back wall "a rigid inner layer and contains an outer layer of lamellas, which are attached to one another with the help of an insulating material, that as a foam mass in the above-mentioned, formed from an outer lamellar layer with high porosity Layers of limited space is injected. 2. Refrigerator according to claim 1, characterized characterized in that the aforementioned porosity of the outer layer is achieved by drilling a plurality of openings or holes, the greatly reduced dimensions are predetermined in such a way that no bubbles are formed on the outer surface of the outer layer as a result of the Injection of the insulation material occurs. 3 · Refrigerator according to claim 2, characterized characterized in that the mentioned openings to the amount of 300 to 500 per square meter of the surface of the outer layer have such dimensions that the air originally located in the mentioned space can escape and that next to them the mentioned holes are arranged according to a suitable pattern in such a way that they have a plurality form horizontal and vertical rows. H. Refrigerator according to claim 2 or 3> characterized in that the openings mentioned slot-shaped with a width of about 0.5 now and with a length of -approximately 1.5 are now executed. 509809/0300 PHX. 71 < 2 / 1-6-19 ' 5 · Refrigerator according to claim 2 or 3 » characterized in that the openings mentioned
are circular with a diameter of approximately 0.5 mm. 509809/0300