Patent Application
20060017195
1. Field of the Invention
This invention relates to a method for injection molding a solid pattern onto a shoe upper, which is capable of overcoming the defect of the prior art that it is unable to molding solid pattern on a shoe upper, which includes the following steps: 1. shoe upper stretching process 2. tightening a lower periphery of the shoe upper material 3. upper mold pressing process 4. injection molding process 5. cleaning up the final product.
2. Description of the Prior Arts
Existing plastic injection molding technology is unable to mold solid pattern onto leather or fabric shoe upper directly, and the defects of the existing plastic injection molding methods are to be explained as follows:
First, the existing technology is unable to stretch the leather or the fabric shoe upper tight enough, the technology of prior art is still at the research stage, which greatly limits diversity of the appearance and the function of the shoe products.
Second, if the conventional method is used to mold plastic onto the shoe upper, since many production equipments are involved, it is impossible for the operator to check all the details. The surface of the shoe upper is likely draped, in this case, not only the injection-molding pattern is failed, but also the appearance of the shoes will be ugly.
The present invention has arisen to mitigate and/or obviate the afore-described disadvantages.
The primary object of the present invention is to provide a method for injection molding a solid pattern onto a shoe upper, which is capable of overcoming the defect of the prior art, and generally including the following steps: 1. shoe upper stretching process 2. tightening a lower periphery of the shoe upper material 3. upper mold pressing process 4. injection molding process 5. cleaning up the final product.
The present invention will become more obvious from the following description when taken in connection with the accompanying drawings, which show, for purpose of illustrations only, the preferred embodiment in accordance with the present invention.
A method for injection molding a solid pattern onto a shoe upper in accordance with a preferred embodiment of the present invention is shown in
First, shoe upper stretching process 10: with reference to
Second, process 20 for tightening the lower periphery of the leather: with reference to
Third, upper mold pressing process 30, as shown in
Fourth, injection molding process 40: as shown in
Fifth, process 50 for cleaning up the final product: after being taken out of the mold, the surface of the leather material 11 is molded with the injection molding material A that corresponds to the cavities 211 of the outer sliding blocks 21 and the cavity 311 of the upper mold 31.
The shoe upper stretching process 10 and the process 20 for stretching the lower periphery of the leather material 11 are able to stretch tight and position the lower periphery of the leather material 11 by employing the stretching rods 14. Furthermore, the moveable stretching molds 22 is able to inwardly tighten the lower periphery of the leather material 11. Thus, the leather material 11 is able to form a flat surface corresponding to the last 12, so that the injection molding material A is firmly molded onto the surface of the leather material 11 in a 3-D manner.
It is to be noted that the outer sliding blocks 21 and the upper mold 31 are well known in the prior art and are not limited to the shapes described above. The effect of the present invention is only achievable with the stretching molds 22. And other molding technologies are known in the art. In addition, the last 12 is movable and extendable so as to enhance the tightening effect of the shoe upper.
While we have shown and described various embodiments in accordance with the present invention, it should be clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.
