BR0004192B1 - nonwoven footwear insole material and manufacturing process for footwear insole material. - Google Patents

Description

"FOOTWEAR FOOTWEAR MATERIAL AND FOOTWEAR FOOTWEAR MANUFACTURING PROCESS".

The present invention relates to an innovative material for the manufacture of shoe insoles which is made of two nonwoven layers. The invention also relates to a process for manufacturing the material for shoe insoles.

Footwear insoles are components that divide footwear construction into the upper (leather) and the lower (sole). The insoles are part of the structure of the footwear, which is fundamental to its good performance and can be compared to the foundation of a house or the chassis of a car.

There are a multitude of products suitable for the manufacture of footwear, however, each must fulfill the specific conditions required in the production of footwear. The main types of shoes according to their manufacturing process are: "assembled", bagged or Strebel, blanched, California and San Crispino. All these types of footwear particularly describe how the insole is crafted in relation to the leather during fabrication. In "fitted" footwear, the leather is glued or fastened to the bottom of the insole. In bagged or Ströebel type, the leather is sewn around the insole. In the blanched type, the leather is sewn together with the insole and the sole.

The bagged or Ströebel type of construction is growing steadily in the construction of sneakers, moccasins and safety shoes, precisely where high-heeled soles may obscure the type of ply construction, but where leather or synthetic leather economy is achieved. It is also in this type of construction that one finds the highest component costs in a shoe.

However, there is a need to find materials for the construction of extremely strong Strõebel shoe insoles to support the construction and its later performance while maintaining its original shape. Also another requirement of the insole material is for the same to accept the sewing process easily, without tearing or sagging, as well as having sufficient flexibility to enable the good demandability of the operator during sewing the nocabedal insole.

Nonwovens have been widely used in the industry for shoe components, either as reinforcing materials such as buttocks, butt or harness reinforcement and spout reinforcement. The use of nonwovens is also increasing in the manufacture of shoe insoles.

Non-woven material is understood as material in which fibers or filaments, whether natural or synthetic, excluding paper, which have not been converted into yarn, but have been interwoven with each other in a number of ways, alone or in combination, as follows:

a) by adding chemical adhesive or binder;

(b) by fusing the fibers or filaments together with other fusible fibers or by means of powders;

c) melting the fibers, first dissolving and then solidifying their surfaces;

d) creating tangles or interlacing of the fibers with each other;

e) sewing the fibers or filaments in their final place.

Fibers are usually filaments that have been cut and prepared.

Needle-stitched nonwoven is one where needle combs provide interlacing and subsequently sew their fibers or filaments, and the sewing threads are responsible for fixing and maintaining the fibers or filaments in the right place, either by straight or zigzag sewing.

The use of needleless nonwovens in insoles for the construction of bagged or Ströebel footwear is long known worldwide. In this nonwoven application preference is given to polyester fibers, but also fibers from other thermoplastic polymers may be used, combined or alone, such as polyamides, polyethylenes or polypropylenes. These structured, ie needled and sewn nonwovens may further be impregnated with agglomerating resins to increase tensile strength and gouge performance.

Also known and widely used in the footwear industry are the insoles produced by nonwoven filaments that are spun and impregnated with bonding resins. However, the insoles thus obtained are limited to a well-defined thickness-resistance or density-resistance relationship. Therefore, in order to obtain higher performance flasks, it is necessary to use nonwovens of higher thickness or higher density.

The object of the present invention is an innovative material for footwear components, in particular for the manufacture of insoles, composed of the joining of two layers of nonwovens with an adhesive middle layer.

The nonwovens may preferably be of filament filament and subsequently impregnated or not with bonding resins. Each of the nonwoven layers may be formed of a single material filament or a mixture of filaments of different materials.

Preferably, the nonwoven filaments are polyester or polypropylene or a mixture of both.

Preferably the material is obtained by lamination of the nonwoven layers with adhesives.

The material obtained according to the teachings of the invention provides a performance gain in tensile strength and gouging without losing in flexibility. This combination of two layers of nonwovens is advantageous because it adds structural performance without the need to increase the amount of fibers or filaments or even aggregating resins. These features result in material savings, with significantly improved performance of the insole, especially in bagged or Ströebel type construction shoes.

The material proposed by the invention is also suitable for the manufacture of insoles for other types of footwear. Footwear insole material is now described based on the following examples illustrating the invention in detail.

EXAMPLE 1

A nonwoven obtained by needling and sewing of fibers or filaments composed of 0 to 100% polyester, whether or not combined with 0 to 100% polypropylene fibers or filaments, is laminated with another nonwoven layer of the same specification. Lamination is by adhesives, preferably acrylic adhesives, styrene butadiene (SBR), polyurethanes or ethyl vinylene acetate (EVA) powders. This gives a material with two layers of nonwoven joined together by a decay layer.

Needled and sewn nonwovens have a weight of 20 to 600 g / m2. The adhesive layer has a weight of 5 to 400 g / m2.

EXAMPLE 2

An adhesive nonwoven footwear laminate footwear material is produced by example1. Nonwoven fibers or filaments are needled and sewn and subsequently impregnated with styrene-butadiene latex (SBR) aggregating resins, acrylic, melamine or urea-formaldehyde resins.

Needle-stitched and sewn non-woven nonwovens have a weight of 50 to 1,000 g / m2. The decay layer has a weight of 20 to 600 g / m2.

EXAMPLE 3

An adhesive nonwoven footwear laminate footwear material is produced by example1. Nonwoven fibers or filaments are needled and sewn, with only one layer subsequently impregnated with styrene-butadiene latex (SBR) binding resins, acrylic resins, melamine or urea formaldehyde.

The needled and sewn nonwoven has a weight of 20 to 1,000 g / m2. The needleless stitched and sewn nonwovens have a weight of 50 to 1,000 g / m2. The adhesive layer has a weight of 20 to 600 g / m2.

EXAMPLE 4

An adhesive nonwoven footwear laminate footwear material is produced by example1. Nonwoven fibers or filaments are needled and sewn. A nonwoven is formed of all polyester fibers and filaments, which are then impregnated with styrene-butadiene latex (SBR) bonding resins. The other non-woven fabric is composed of 0 to 100% polyester fibers and filaments, whether or not combined with 0 to 100% polypropylene fibers and filaments and thereafter thermally calendered.

In this way, a material formed by two differently structured nonwoven layers is obtained, where the individual characteristics of each one of them are summed up in order to achieve specific levels of flexibility.

The needled, sewn and thermally calmed nonwoven has a weight of 20 to 600 g / m2. The needlecraft and subsequently impregnated nonwovens have a weight of 80 to 2,000g / m2. The adhesive layer has a weight of 5 to 400 g / m2.

EXAMPLE 5

An adhesive nonwoven footwear laminate footwear material is produced by example1. Nonwoven fibers or filaments are needled and sewn. A nonwoven is formed from 0 to 100% polyester fibers and filaments whether or not combined with 0 to 100% polypropylene fibers and filaments. The other non-woven fabric is composed of 0 to 100% polyester fibers and filaments, whether or not combined with 0 to 100% polypropylene fibers and filaments, and is thermally calendered.

This results in a material formed by two differently structured nonwoven layers, where the individual characteristics of each of them are summed up in order to achieve specific levels of flexibility. 600 g / m2. The non-woven needlecraft has a weight of 20 to 600 g / m2. The adhesive layer has a weight of 5 to 400 g / m2.

Claims (17)

1. - "COMFORTED FOOTWEAR SHEET MATERIAL", consisting of needled and sewn nonwovens composed of fibers or filaments of thermoplastic material, characterized in that it is made up of two layers of nonwovens joined together by means of an intermediate layer of adhesive. 2. "CONNECTED FOOTWEAR SHEET MATERIAL" according to claim 1, characterized in that the adhesive is selected from acrylic, styrene butadiene (SBR), polyurethanes or ethyl vinylene acetate (EVA) powders. . 3. A "non-woven footwear material" according to claim 2, characterized in that the nonwoven layers are composed of polyester fibers or filaments. 4. A "nonwoven footwear material" according to claim 2, characterized in that the nonwoven layers are composed of polypropylene combined polyester fibers or filaments. 5. A non-woven footwear material according to claim 2, wherein one of the nonwoven layers is composed of polyester fibers or filaments and the other layer of nonwoven fabrics is composed of polypropylene combined fibers or filaments. 6. A "non-woven footwear material" according to any one of claims 3, 4 or 5, characterized in that one of the nonwoven layers is impregnated with resin. 7. A non-woven footwear material according to any one of claims 3, 4 or 5, characterized in that the two layers of nonwoven are impregnated with resin. 8. A "non-woven footwear material" according to any one of claims 3, 4 or 5, characterized in that one of the nonwoven layers is thermally calendered. 9. A non-woven footwear material according to any one of claims 3, 4 or 5, characterized in that one of the nonwoven layers is impregnated with resins and the other layer is thermally calendered. 10. [Claim missing on original document] 11. "CONNECTED FOOTWEAR SHEET MATERIAL" according to any one of claims 6, 7 or 9, characterized in that the impregnating resin is selected from styrene butadiene latex (SBR), acrylic resins, melamine resins or deurea-formaldehyde resins, or a mixture of these resins. 12. "CONNECTED FOOTWEAR SHEET MATERIAL" according to one of claims 2, 3, 4 or 5, characterized in that the needled and sewn nonwovens have a weight in the range of 20 to 2,000 g / m2, whereas the layer Adhesive weight has a weight between 5 and 600 g / m2. 13. A "FOOTWEAR FOOTWEAR MATERIAL" according to any one of claims 6, 7 or 9, characterized in that the needles and stitched and resin impregnated nonwovens have a weight in the range of from 20 to 2,000 g / m2 while bedridden. of adhesive a weight between 5 and 600 g / m2. 14. "FOOTWEAR SHEET MATERIAL MANUFACTURING PROCESS", the material of which is defined in claim 1, characterized in that the material is obtained by adhesive lamination of two layers of needled and sewn nonwovens composed of fibers or filaments of thermoplastic material preferably polyester or polypropylene combination. 15. "FOOD SHEET MANUFACTURING PROCESS" according to claim 14, characterized in that the nonwovens are previously calender radiothermally. 16. The footwear footwear manufacturing process according to claim 14, wherein the nonwovens are previously impregnated with resins. 17. The footwear straw material manufacturing process according to claim 14, wherein one of the nonwoven layers is thermally calmed and the other nonwoven layer is impregnated with resins.