EVA INJECTION MOULDED SLIPPERS
The manufacturing process of these eva injection moulded slippers is completed in four steps
Preparation of EVA Compound
Injection for granules
Injection of Straps and uppers
Fitting & Packing
The manufacturing process of EVA injection moulded slippers can be summarized as under
Preparation of EVA Compound – EVA compound is prepared by mixing EVA 1802 grade with other ingredients like colours, curing agents, blowing agent in kneader. This compound from Kneader is then passed through extruder, and finally through granulator to get EVA compound in the form of granules. These granules are then passed through water chamber for cooling and removing dust and are passed through numbers of cyclones for drying.
Injection of granules – The granules are injected into sole mould placed on the presses of fully automatic computerized EVA injection machine. After curing of sole, presses open up automatically and an expanded sole comes out from Injection machine. The time, temperature and volume is maintained by computer, as per requirements.
Injection of straps and uppers – PVC compound granules are injected to the straps mould through horizontal PVC injection machine. Fitting & Packing – Straps obtained from horizontal machine are inserted Into EVA sole. After quality checking, slippers are packed in C. B. boxes and finally to cartoon.
The Process flowchart of manufacturing EVA Injection Footwear is depicted as under:
PU Sole Footwear
The PU Sole footwear manufacturing process consist of three steps
Manufacturing of Synthetic Leather uppers and straps.
Pouring of PU Liquid into moulds of shoes by pouring machine.
Finishing & packing.
Manufacture of Uppers
To manufacture uppers from synthetic leather sheet, the Upper sheet is pasted with PU liner cloth by the lamination machine. Required uppers are then cut from the pasted sheet by putting on platform of upper cutting hydraulic machine and then placing knife on the sheet. The cut uppers then send for stitching by industrial sewing machines. After stitching, eyelets are inserted into the uppers by eyeleting machine and insoles (sox) are stitched by string lasting machine.
Pouring of PU liquid into moulds
In this process , first of all ready uppers are lasted. On the last of Shoes mould manually and then moulds are closed. These closed moulds are then kept on the 62 stations conveyer, which moves in anticlock wise direction. In this way the moulds keep moving along with conveyer. The conveyer stops for a few minutes under the arms of pouring machines where the PU Liquid (mixture of Poly isocyanate and polylol) is poured into hot mould by the nozzle fitted into the tubes carrying PU Liquid which comes through pump from the containers of Poly isocyanate and polylol.
The whole arrangement is fixed on the stand of the machine (arms). Before pouring the liquid into mould, moulds are cleaned by MCL Liquid and then mould-realizing agent is applied inside the mould, the moulds are heated by passing though the hot chamber, which is fitted, on conveyers. The setting of PU liquid in hot moulds starts gradually and after setting of PU, moulds are opened manually. Shoes are then removed from the mould and another upper is lasted on the last of mould for PU casting. The computer of the machine controls the volume of PU liquid, pouring time, time period and mould temperature.
Finishing & packing
After casting PU sole, shoes are shifted for checking, & trimming and then printed sponge insole is inserted into the shoes. The finished shoes are packed into Corrugated Boxes and finally into cartoon.
The process flowchart of manufacturing PU Footwear can be depicted as under.