Patent MX-2014001778-A (MX)
Title: Method for manufacturing sports footwear molded in a single piece and obtained product.
Inventor: GONZÁLEZ JÓSE LUIS RODRÍGUEZ
IPC: A43D35/00
Filed: 2014-02-14
Abstract: Described is a novel method for manufacturing sports footwear molded in a single piece and obtained product, which includes the use of a machine for injecting thermoplastic polyurethane TPU, this latter material being an ideal material due to its characteristics of weight, flexibility, touch, resistance, etc., there is a wide variety of thermoplastics used as an alternative material such as: PVC, Pebax, Nylon, TPR, etc., that may replace the aforementioned material, the machine may close with an average of 200 tons; with regard to the pressure, a flow, pressure and counter-pressure fluctuation is presented when the mold is filled, thus the machine having a close of 30 tons, the time may also vary around 3 minutes in the machine, or 20 seconds in the injection and approximately 2 minutes with 40 seconds in cooling the mold, and other 50 seconds to 1 minute and 15 seconds in removing the footwear and preparing the second injection of total operation which may last around 4 to 5 minutes, where said method is formed by three steps: a) injecting the lower portion, at the end of the process this lower portion will be the most important part of the sole, since it is injected with a TPU material with a shore hardness of 90A, having a predetermined rigidity and consistency for the manufacture thereof, this stage including the use of a base mold for injecting TPU polyurethane so as to form the lower portion of the footwear; b) injecting the inner sole with a thermoplastic polyurethane material with a Shore hardness of 90A, this may complement the firmness of the sole and the base of the foot of the user, this stage using a middle mold for injecting thermoplastic polyurethane TPU, for the injection of the inner sole; c) forming the footwear product in a single piece, the upper mold receives the already injected sole and inner sole, the total body of the product being subsequently injected, the footwear being finished by integrating a type of cushion that covers almost all th e inner portion of the shoe and is channeled in both lateral portions thereof and partially channeled from the heel to the tip of the sports footwear, which is made of synthetic textile material or rubber or synthetic material, covering almost all the inner portion of the shoe as a type of cushioned liner; the lower portion resembles the sole of the foot and is formed by channeled sub-divisions that partially cover the lower portion of the heel, a tongue protruding from the upper portion of the base of the footwear, where the final tongue will be coupled by stitches, the side portions and the front portion that protrudes due to the tongue projection are trimmed with side stitches, the lower portion being attached to the upper portion for completing the footwear, this being performed by integrating a type of channeled slipper, the shoe comprising a cushioned heel support that will partially cover from the rear portion of the heel to the upper portion of the heel until reaching the tip of the slipper, forming an inner liner in the sports footwear.