MXPA00010496A - Continuous method for producing a refrigerator - Google Patents

Abstract

The invention relates to a method for producing a refrigerator, characterized in that a continuously produced foam sandwich element is cut into measured sections or mitre-cut and arranged as shown in Figures 1, 2 and 3 so as to forma box which is open on two sides.

Description

CONTINUOUS PROCEDURE FOR THE MANUFACTURE OF A GEORIFICO Field of the Invention The invention relates to the manufacture of a refrigerator from permanently manufactured sandwich foam elements.

BACKGROUND OF THE INVENTION Refrigerators and refrigerators are usually foamed in support molds. These support molds are intended to maintain the prefabricated outer and inner parts of the casing at a distance against the pressure of the foam formed. For corresponding multiple different models, which differ in the construction, size and wall thickness of the appliances, multiple support molds are necessary in a production. The position of the housing in the support molds is important in this respect; here a position of the foam with the opening of the door upwards is usually preferred. This position of the devices is of the utmost importance for a uniform distribution of Ref. 124306 foam and to achieve foam properties, because this determines the length of the flow path that the foam must travel. However, it is not possible to produce devices completely free of air bubbles and inclusions. In addition to this, there are always greater oscillations of the bulk density, which results in a greater consumption of material.

Description of the invention The object of the invention is to provide a method for manufacturing a refrigerator from foam elements in which the use of support molds can be suppressed. It is therefore the object of the invention a method for the manufacture of a refrigerator in which sandwich elements are continuously manufactured with corresponding cover layers and cut to length (Fig. 1) or cut to a conforming miter. to Fig. 2. The cut-out is folded three times according to Fig. 3 and joined by the stitching point. In this way, an open box is formed on both sides, the sides of which represent the side walls, the bottom and the top face. The back face can either be foamed in molds as hitherto usual, the molds being substantially simpler than the usual support molds, or a sandwich element made in the same process can be foamed or assembled and correspondingly cut to size to lengths . The remaining opening is closed with a correspondingly constructed door, which is either manufactured in a conventional manner or it can be a sandwich element made of double tape. Foam in the process according to the invention preferably uses hard polyurethane foam. In a variant of the method according to the invention, the production of the previously cut element according to FIG. 4, which is subsequently folded back in accordance with FIG. 5 and then the bottom, back wall and top face are formed; here, the side walls are either foamed or assembled as sandwich elements manufactured in continuous and cut to size to lengths. In this continuous production, for example, sealing pads necessary for the front face of the refrigerator can be foamed. In the process according to the invention, the usual cover layers can be directly foamed continuously. It eliminates the costly manufacture of box profiles in metallurgical manufacturing as well as the costly and wasteful deep-drawing of the inner container. In addition to this, they are obtained precisely in the inner container due to the uniform thickness of the remarkable thermoplastics material savings. At the same time, the costly prefabrication of different housing sizes is eliminated. High investments for cores and mold supports for foaming as well as deep drawing are also suppressed. A variation of the insulation thicknesses is easily adjustable by the slot width of the double conveyor belt.

The laborious application of vacuum insulation panels in the insulating layer in the usual procedures when inserting these vacuum insulation panels in this continuous process is also substantially simplified. If necessary, these can be fixed by applying a part of the foam to a covering layer and then the residual volume can be applied with the foam in double oscillating or stationary tape (see Fig. 6 and 7). The great advantage of the continuous production according to the invention compared to the traditional manufacture of the cooling devices in corresponding support molds lies in the homogeneous manufacture of the polyurethane foam with an ordered and defined cellular structure. Specifically, the cellular structure of the foam in the direction of travel can be arranged on a double conveyor belt horizontally anisotropically (see FIG. 9). A similar disposition of the cells results in the foam, in the direction of the thickness, which is also the direction of use of the cooling apparatus, to give you a clear thermal conductance factor better than an isotope of the spray or even There is an anisotropic disposition, and the transverse section is said to be faith. Figures 1 to 11 show the different parts that make up the refrigerator, the ipyencicn and its disposition.

Brief description of the figures. Figure 1 illustrates a continuously produced sandwich foam member of the useful type of the present invention. Figure 2 illustrates a continually produced sandwich foam member, of the useful type of the present invention, cut in such a way that it can be arranged to form an open box on both sides according to the process of the present invention. Figure 3 illustrates the manner in which the continuously produced sandwich foam member illustrated in Figure 2 can be arranged to form an open box on both sides according to the process of the present invention. Figure 4 illustrates a sandwich foam element produced continuously cut in such a way that it can be arranged to form a four-sided shape in which each of the four sides has a different surface area. Figure 5 illustrates the manner in which the continuously produced sandwich foam element illustrated in Figure 4 can be arranged to take the desired shape.

Figure 6 illustrates the process for the production of a continuously produced sandwich foam member, of the type useful in the present invention. Figure 7 illustrates the manner in which the vacuum insulation panels can be arranged in the continuously produced sandwich foam element. Figure 8 illustrates the anisotropic cell structure of the continuously produced sandwich foam member of the type useful in the present invention. Figure 9 illustrates a continuously produced sandwich foam element, as illustrated in Figure 2 with its foam structures oriented horizontally and anisotropically in the direction of travel on a double conveyor belt. Figure 10 illustrates the manner in which the continuously produced sandwich foam member, illustrated in Figure 2, can be arranged to form a "U" according to the process of the present invention. Figure 11 illustrates the manner in which the continuously produced sandwich foam element illustrated in Figure 2 can be arranged to form a WW "according to the process of the present invention.

Examples Comparative example 1: Oscillations of bulk density Double conveyor belt 31 to 32 kg / m3 Housing: 31 to 35 kg / m3 It can be seen from Comparative Example 1 that by the process according to the invention it is possible to save from 5 to 10% of the total bulk density with a comparable minimum bulk density.

The apparent density is obtained from the quotient of mass and volume. A test piece of hard foam is cut from the panel and measured and weighed.

Comparative example 2 _ Thermal conductivity coefficient 1) Isotropic foam: 20.5 m / W / Km 2) Anisotropic foam: 19.5 mW / Km (horizontal cellular orientation) (measurements made with a system of expanded urethane or with n-pen ano 3) Refrigerating and refrigerating appliance: 22.5- 23.5 mW / Km (measurements made with an expanded polyurethane system with n / i-pentane) From Comparative Example 2 a coefficient of thermal conductivity is approximately 10% lower; According to experience, this results in an energy consumption of 5 to 7% less than the wall thickness in refrigerating appliances.

The coefficient of thermal conductivity of the foams is measured by the 2-plate method (according to Poensgen) and is defined according to DIN 52 612. In this regard, measurements are made at different temperatures (usually from -18 to + 25 ° C). The average temperature difference between the measurement temperatures reaches 10 ° C. The measurement of the coefficient of thermal conductivity is determined directly from the intensity of the current and the voltage of the heating plate, therefore it can be designated as me or as a user. It is noted that in relation to this date, the best method known to the applicant to carry out the aforementioned invention, is that which is clear from the present description of the invention.

Having described the invention as above, property is claimed as contained in the following:

Claims (9)

1. Process for the manufacture of a refrigerator, characterized in that a foam sandwich element manufactured in continuous, with its cellular structure arranged anisotropically in horizontal direction, is cut to length or miter and is arranged forming a box with 2 open sides of according to figures 1, 2 and 3.

2. Process for the manufacture of a refrigerator, characterized in that a sandwich element manufactured in continuous, with its cellular structure anisotropically arranged horizontally, is cut into miter, made to measure and disposed forming a body according to figures 10 and 11.

3. Process for manufacturing a refrigerator according to claim 1 or 2, characterized in that the rear wall or the side walls are foamed in corresponding support molds.

4. Process for the manufacture of a refrigerator according to claim 1 or 2, characterized in that the rear wall or the wall is sealed with corresponding sandwich elements according to the invention cut as they are fixed mechanically or by means of gluing or by foaming.

5. Process for the manufacture of a refrigerator according to claim 1 to 4, characterized in that vacuum insulation panels are inserted in a continuous foaming process, in which preferably before entering the pressure zone they are foamed in a cover layer according to figure 5.

Process for the manufacture of a refrigerator according to claim 1 to 5, characterized in that metal cover layers or cover layers of organic polymers are used as cover layers.

Process for the manufacture of a refrigerator according to claim 1 to 5, characterized in that, as cover layers, paper is used on one or both sides, preferably a complex of aluminum-paper sheets.

8. Process for the manufacture of a refrigerator according to claim 1 to 7, characterized in that in the manufacture of the element in pairs they are couched so that they can constitute the frontal closure of the refrigerator or that they can also be used as elements mounting aids.

9. Process for the manufacture of a refrigerator according to claim 1 to 8, characterized in that components for the final assembly, such as door hinges, sealing gaskets, pipes and components, are inserted in the double strip for joint solid foaming. as evaporators. A process for the manufacture of a refrigerator is described, characterized in that a foam sandwich element manufactured in continuous, is cut to length or miter and is arranged forming a box with 2 open sides according to Fig. 1, 2 and 3.