Dual-density EVA footwear mid-sole and method for making same

Inactive Publication Date: 2011-10-20
JIMLAR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0046]FIG. 12 is perspective view of the mold cavity and contents as heat and pressure

Problems solved by technology

While this single step molding process results in a mid-sole with sections of different hardness due to the different densities of the raw EVA materials, the boundaries of the di

Method used

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  • Dual-density EVA footwear mid-sole and method for making same
  • Dual-density EVA footwear mid-sole and method for making same
  • Dual-density EVA footwear mid-sole and method for making same

Examples

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Embodiment Construction

[0050]FIGS. 1 and 2 illustrate a typical footwear product, generally designated A, incorporating the dual-density EVA mid-sole of the present invention, generally designated B. The mid-sole B of the present invention can be formed in whatever shape and size that may be appropriate for footwear product A and with whatever exterior contours and surface features desired. Accordingly, the particular mid-sole design and footwear product style shown in the drawings should not be considered in any way as a limitation on the scope of the present invention but instead simply as a means of illustrating a typical mid-sole B resulting from the fabrication process of the present invention and a typical footwear product A that might incorporate such a mid-sole.

[0051]FIG. 3 shows the components of footwear product A in exploded form. Product A consists of an upper 10, an insole 12, mid-sole B and an outsole 14. Upper 10, insole 12 and outsole 14 are all standard components manufactured by any one ...

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PUM

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Abstract

The method for fabricating a dual-density mid-sole includes the steps of: injection molding EVA material of a first density into a block; placing the first density EVA block and raw EVA material pellets of a second density together in a mold cavity; and applying heat and pressure to the first density EVA block and raw EVA material pellets of a second density in the mold cavity to form a fused component. The fused component is shaped and detailed into the mid-sole in a separate mold cavity. The result is a dual-density mid-sole consisting of one or more blocks of EVA material of a first density fused to EVA material of a second density where the size, shape and location of the different density sections can be accurately controlled and precisely defined. An article of footwear including an upper, the dual-density mid-sole consisting of one or more blocks of EVA material of a first density fused to EVA material of a second density, and an outsole, may be formed.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to footwear and to a method for making footwear and more particularly to a dual-density EVA footwear mid-sole and a method for making same.[0003]2. Description of Prior Art Including Information Disclosed under 37 Cfr 1.97 and 1.98[0004]Footwear mid-soles fabricated from ethylene-vinyl acetate (EVA) material are known in the art. Methods of fabricating EVA mid-soles are also known. Such methods normally include heating and applying pressure to raw EVA material in a mold cavity to fuse the material into the desired shape. After the component is removed from the mold and cured, it is shaped further and the exterior is detailed. The mid-sole is then incorporated into the footwear product using conventional fabrication techniques.[0005]Fabrication of the EVA mid-sole in this fashion results in a mid-sole with a substantially uniform hardness throughout. However, for certain applications, it has...

Claims

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Application Information

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IPC IPC(8): A43B13/14A43D8/00
CPCA43B13/023B29D35/142A43B13/188A43B13/125
Inventor SMITH, JUSTIN R.
Owner JIMLAR CORP
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