CS240309B1 - Divorced model for preparation of galvanic shells of sole molds - Google Patents

Abstract

The proposed model consists of an upper flexible layer and an inner rigid core. The sole and top model form a single unit. The flexible layer enables the removal of the distributed models from the rigid distribution mold. The galvanic shell prepared from the basic sole model serves as the distribution mold.

Description

The invention relates to a developed model for the preparation of galvanic shells of sole forms.

In the manufacture of galvanic shells of sole molds, models consisting of a sole and a top are used. The top of the outsole model is fixed to form a single block on which a galvanic shell is applied after silvering. The basic lining models are made of wood, laminated on the surface with flat materials such as leather, rubber vulcanizates, foil of mocked polyvinyl chloride with the desired tread pattern and provided with a sole frame. The tops are also prepared for the basic wood model. If more than one mold is needed from one size number to a mold set, a model is required to find each mold. The models are prepared either manually as described above or distributed in molds. Until now, divorced models are prepared as rigid in the whole layer in flexible forms.

Expanded lining models are prepared in silicone or polysulfide rubber molds. The molds for the preparation of the divorced models are made by casting the basic models into silicone or polysulphide rubber, which solidifies by crosslinking to a flexible elastic mass. The mold for the divorced tops of the models is prepared in a similar manner, or the tops for the divorced model of the sole are made of wood. In prepared flexible molds, the models are distributed by casting from filled epoxy resins or polyesters. The dividered top and sole are bolted together in one piece. After modification, the shell of the sole form is made on the model by galvanic method.

The accuracy of the expanded models from a mold made of silicone or polysulfide rubber is a function of time. The rubbers, although filled, additionally crosslink, undergo supramolecular changes, increase density and associated volume change, which affects the accuracy of the expanded models and hence the galvanic shells. In addition, in the tempera of the models after silvering, a layer of deposited silver film often tears between the top and the sole. due to the unequal weight of the model of the sole and the top and hence the different speeds of the dilatation of both parts. Models must be re-edited and silvered. The models prepared in this way are rigid, full-layer and heavy. After making a gavanic shell, it is destroyed when it is removed - it cannot be used more than once. The forms and models elaborated therein represent irreversible, ecologically defective waste.

SUMMARY OF THE INVENTION The object of the present invention to overcome the aforementioned drawbacks of prior art models for the preparation of galvanic shells in outsole forms is to provide a model characterized in that the sole and apex consist of an integral unit consisting of a flexible PVC topsheet 1 or copolymers thereof. . The divorced model is prepared in a galvanic shell made on the basic model.

From the galvanic shell 3 made on the base model, the vertex and the model are removed. A casting paste based on PVC or its copolymers is poured into the thus formed cavity of the galvanic shell 3 so as to wet the entire surface of the cavity. The excess PVC casting paste or its copolymers are discarded. The galvanic shell is placed in a gelatin oven and allowed to gelatinize. After the thin layer has gelled, the PVC casting paste or its copolymers are again poured into the hot galvanic shell and poured out excess. The paste layer is gelatinized. If necessary, the whole process is repeated. Resilient topsheet 1 of PVC, or its. The copolymers are gelatinised by the depth and shape of the tread. It ranges from 0.5 to 5 mm. In a cooled galvanic shell 3 provided with a gelatinised flexible PVC layer 1 or its copolymers, a polyurethane rigid foam mixture is poured in an amount of 40 to 45% of the void volume, the free foaming of the mixture being at least three times. The shell is covered with a metal plate with drilled holes of at least three, in which two screws over the plate are fastened by means of nuts. One opening is used to escape the excess polyurethane mixture during foaming. The galvanic shell 3, after covering with a metal plate, is sealed into a mechanical press so that the increasing rigid polyurethane foam does not lift the metal plate. After reacting and cooling the rigid polyurethane foam forming the inner solid core 2, the model is removed from the galvanic shell 3 by means of two embedded screws. After removing the bolts from the prepared divorced model, there are threaded holes in the inner rigid core 2 of rigid polyurethane foam, which is used to fix the divorced model after finishing - painting and silvering to the workbench in the galvanic bath. The entire process of distributing models in the galvanic shell 3 can be repeated any number of times, using the galvanic shell 3 together with the galvanic shells prepared from the expanded models to prepare a set of molds. Also, the expanded models can be used multiple times to prepare additional galvanic shells of the outsole forms by removing them from their shells.

In particular, the advantages of the expanded model for the preparation of the galvanic shells of the sole forms of the present invention are that the accuracy of the produced galvanic shells is increased, the possibility of melting the deposited silver film at model temperatures is eliminated and the model can be used to prepare the galvanic shells several times. flexible

249309 the topsheet prepared by gelling the PVC-based casting paste or its copolyniers allows it to be removed from the prepared Gavarfian shell without damaging it. The inner rigid core of rigid polyurethane foam after separation of the flexible topsheet is, like the flexible topsheet, a manageable waste. The galvanic shell in which the divorced outsole model is prepared is used in the prepared set of sole forms. Virtually no irreversible waste is produced. The expanded model of the invention is four to five times lighter than its equivalent, prepared from a filled epoxy resin. It is also not necessary to prepare separate distribution forms.

In the drawing, FIG. 1 depicted model in the form of - a galvanic shell prepared from a basic model in a longitudinal section, where 1 represents a flexible top layer of a PVC model or its copolymers, 2 an inner rigid core of rigid polyurethane foam, 3 a galvanic shell prepared from a basic model.

Claims (1)

240309 5 The top layer prepared by gelatinizing a PVC-based cast paste or copolymers thereof allows it to be removed from the prepared Cavarra shell without damaging it. The inner rigid polyurethane foam core, as well as the resilient topsheet, is separated from the resilient topsheet. manageable waste. The galvanic shell in which the dissected sole models are prepared is used in the prepared suture mold kit. There is practically no irreversible waste. The divergent model of the invention is four to five times as light as its equivalent, prepared from the filled epoxy resin. Thus, it is not necessary to prepare separate distribution forms. In the drawing, in FIG. 1, an expanded model is shown in the form of a galvanic shell prepared from a base model in a cross section, where 1 represents a flexible top layer of a PVC or co-polymer model, 2 internal rigid polyurethane foam core , 3 galvanic shells prepared from the basic model. D E D M e τ Divorced model for the preparation of galvanic shells of the sole forms, exuding that the sole and the top form a monolithic cell consisting of a flexible top layer of polyvinyl chloride layer [1] or co-polymers thereof and an inner rigid core (2) of rigid polyurethane foam. 1 sheet of drawings Λ