MXPA99010144A - Improvements in the fabrication process of laminated balls - Google Patents

Abstract

Procedimiento mejorado para la fabricación de balones laminados, que comprende formar mediante un proceso de rotomoldeo una esfera hueca que configura la cámara o el cuerpo del balón, de un material termoplástico o termofijo, montándose en esta etapa la válvula hembra para el inflado del balón, caracterizado por las etapas de embobinar dicha cámara previamente inflada a un diámetro deseado con un hilo o filamento resistente;cubrir con paneles o gajos de un material y diseño predeterminado la cara externa de la cámara, la cual ha sido previamente recubierto con adhesivo;introducir la cámara previamente recubierto con los paneles o gajos en un molde esférico a temperatura ambiente y por un tiempo predeterminado, proporcionándole a dicha cámara una presión de aire suficiente para proyectar el cuerpo de la cámara contra las paredes de los moldes a fin de propiciar la adherencia adecuada de dichos paneles al cuerpo de la cámara y, extraer el aire del balón asífabricado y retirarlo de los moldes correspondientes.

Description

% of the workforce and a production that could be considered as optimized with percentages that could be included in a 10 to 15%. If it is considered that with the procedure of the invention, up to 50% savings have been achieved in the labor employed in the manufacture of the product resulting from the procedure in question and an increase in the manufacture of said product up to 3 times more, this necessarily means that the process object of this application presents characteristics that distinguish it from all the light of the procedure carried out so far in the manufacture of laminated balloons. As an antecedent of the procedure before us, mention could be made of Mexican Patent No. 163049, the owner of which is the same as that of the application in question, which refers, in a general context, to a process for the production of a foamed PVC ball. , whose main objective is the saving of raw material used in its manufacture, as well as that of lightening the weight of said ball, without sacrificing its resistance and its utilitarian characteristics, manufactured with a traditional rotomoulding procedure and particularly the improvement of the procedure in the sequence of the steps and their observed operating conditions, obviously, the improvements of the product fall on the characteristics that the walls of said ball acquire to be formed by a foamed PVC. Another antecedent that could be considered as forming part of the prior art with respect to the invention that concerns us, is Mexican Patent No. 164053, in which an improved rotomoulding procedure is claimed for the decoration of inflatable articles, whose particular feature is the addition to the plastisol, before subjecting the material to the corresponding molding temperatures, of a certain amount of small densely colored granules, in different shades, which provide the product, that is, the walls of the ball with a decoration based on small spots distributed randomly over the entire surface of the body of the ball, giving it an attractive finish and decoration. Of the procedures covered in the above-mentioned patents, it could be inferred that up to now and before the procedure developed by my client, the ball manufacturing technique has suffered small and almost insubstantial changes, restricted to the use of new materials that the time was developed, without anyone having been interested in devising a different procedure that would bring the advantages that with the procedure of the invention are obtained, which result in a highly competitive procedure, both in their equipment investment and in the value of the product obtained, as well as in the smaller number of personnel employed in its implementation. Therefore, an object of the invention is the implementation of an improved rotomolding process for the manufacture of balls with laminated external surface, whose manufacturing steps have been avoided without affecting the quality of the product obtained.

It is yet another object of the invention, a process for the manufacture of laminated balloons, with a highly increased level of productivity which results in high quality laminated balloons. It is a further object of the invention, the implementation of a process for the manufacture of laminated balloons in which a smaller number of production equipment is used. Another object of the invention is an improved process for the manufacture of laminated balloons, whose implementation will be reflected in a reduced cost of the product obtained, derived in particular from the decrease in the labor used in its manufacture of its high percentage of increase in productivity and low investment in the equipment used. These and other objectives will be clearly derived from the detailed description that follows of the procedure of the invention and still others not contemplated in the foregoing. With the purpose of weighing the differences of the method of the invention according to the procedure that until now put into practice for the manufacture of laminated balloons, the following describes, in a summarized form, the different steps or stages of the traditional procedure, which roughly consists of the following stages: (1) Mix by friction at a temperature that varies in a certain range, depending on the nature of the raw materials used, the rubber and vulcanizing components in a roller mill. (2) Submit said mixture of raw materials, previously mixed, to a stage of calendering, which has for its object the obtention of a uniform and continuous rolled paste. (3) Trim or smooth the uniform and continuous sheet, in such a way that four segments are obtained that joined by their edges configure the preform of the body of the balloon, adhering thereto the female part of the inflation valve. (4) Inserting said preform into a hot spherical mold, injecting air under pressure and raising its temperature for a sufficient time until the vulcanization of the preform is obtained and taking this the spherical shape characteristic of a balloon. (5) Subsequently submit the vulcanized chamber obtained from the previous stage to a step of embossing with a filament or thread of resistant material, which is distributed homogeneously over the entire surface of the chamber in a determined number of circumbalaciones. (6) Cover the vulcanized and basted chamber of the previous stage, with a layer of unvulcanized rubber, placing two half spheres that cover the embossed surface, then submitting to a second step or vulcanization stage at high temperature and applying to the outer surface of the second rubber layer a layer of adhesive. (7) Coating the second layer of rubber with adhesive and placing on it, according to a predetermined pattern, the panels or sections of laminated material and placing said ball again with the laminates arranged on its external surface in a hollow finishing mold external, whose design will correspond to the design that is intended to have the ball on its external surface; and (8) Remove the air from the balloon and remove the finished product from the corresponding hollow mold. In the various stages mentioned above for the manufacture of a laminated balloon by the traditional process, it is necessary to use a large quantity of equipment whose cost and operation result in the cost of the product thus obtained, thus diminishing the margin of utility in the sale of the product. The various equipment used in the manufacture of laminated balloons by the traditional process could be summarized as follows: a steam boiler; a compressor; a bamburi (mixer); cutting guillotine; two roller mills, one for chewing and one for mixing; a rolling calender; hydraulic press; blanks for die-cutting of preforms; molds for vulcanizing the chamber; an embovinador for the filament or thread; vacuum forming molds for the configuration of the balloon shell; molds for vulcanizing the strung chamber; Sanding raffle and washing tank; conveyor oven for the application of the steam-heated adhesive; vacuum final mold for the application of the outer panels of the laminated ball. For the operation of all the equipment mentioned above, a total of 21 operators are required which, under optimal conditions, would produce 800 finished pieces in an 8-hour shift. The aforementioned process, which forms part of the prior art, should be classified as a vulcanization process at elevated temperatures and pressures, so that additional equipment capable of generating the temperatures and pressures required for the manufacture of the laminated balloons is necessary. Now, with respect to the method of the invention, this is a procedure at room temperature, highly simplified, which allows it to be classified as a high-performance process, since a large number of stages and the use of various equipment are obviated, in addition to the highly ostensible decrease of the necessary operators involved in each of the stages of said procedure. The improved method in question, object of the present application, consists of the following steps: (1) Form by means of a normal rotomolding process a hollow sphere that will configure the camera or the body of the ball, of a thermoplastic or thermosetting material, providing it with a sufficient volume of air until said chamber reaches a precise external gauge, thus providing the desired weight and diameter and integrating in the same rotomolding stage the female valve for balloon inflation . (2) Coating the inflated body of the chamber with a filament or thread, distributing homogeneously said embossed on the surface of the chamber and covering the outside of the embossed thread with adhesive. (3) Cover the external body of the ball with panels or segments of a predetermined material and design. (4) Insert the balloon covered with panels or segments into a spherical mold at room temperature. (5) Close the pressure mold and inflate the balloon under sufficient pressure so that the walls of the balloon body project towards the internal face of the molds, with which an adequate adhesion of the molds is obtained. panels or segments on the body of the balloon; and (6) Extract the air from inside the balloon and remove these from the molds with which the finished product is obtained. As mentioned previously, in the various stages of the new procedure object of this application, a total of 1 3 operators are employed, being able to produce up to a total of 3,000 balls per 8-hour shift, from which the great benefit that is obtained from the implementation of the method of the invention. The equipment used in the implementation of the process of the invention, which is a manufacturing process for laminated balloons, can be summarized as follows: a rotomolding apparatus; compressor; an electric device; a conveyor for the application of the adhesive and a vacuum mold for fixing the outer panels to the body of the balloon. With respect to the preceding paragraph, the decrease in the equipment used for the manufacture of laminated balloons according to the method of the invention is clearly noticeable, in comparison with the equipment used in the traditional process of manufacturing said vulcanized balloons. From the foregoing, it must be concluded that each and every one of the originally proposed objectives has been satisfactorily fulfilled, and still others not contemplated, and it being obvious that the method of the invention may be subject to changes or modifications in its various stages. it is intended that these be considered as forming part of the present application, as long as they fall within the scope and spirit of the invention in question.

Claims (3)

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REVIVAL NAME IS 1. Improved process for the manufacture of laminated balloons, comprising, by means of a rotational molding process, forming a hollow sphere forming the chamber or the body of the balloon, of a thermoplastic or thermoset material, the female valve for inflation of the balloon being mounted at this stage. characterized by the steps of embolizing said previously inflated chamber to a desired diameter with a resistant wire or filament; cover with panels or segments of a predetermined material and design the external face of the camera, which has been previously coated with adhesive; introducing the chamber previously coated with the panels or segments into a spherical mold for a predetermined time, providing said chamber with sufficient air pressure to project the body of the chamber against the walls of the molds in order to promote adequate adhesion of the mold. These panels to the body of the camera and, extract the air from the ball thus manufactured and remove it from the corresponding molds. The method according to claim 1, wherein the molds used for fixing the panels or segments that make up the laminate of the ball, have a design in accordance with the configuration and design of said panels or segments, being taxed at this stage of the procedure on the lamination of the balloon the corresponding design.

3. The method according to claim 1, wherein the winding of the resistant wire or filament on the surface

The external camera is distributed evenly throughout the body of the camera.