A kind of weft-knitted spacer fabric and its preparation method, and polyurethane foam composite material comprising the fabric

Abstract

The invention discloses a weft-knitted spacer fabric and a preparation method thereof, a polyurethane foam composite material comprising the fabric, a preparation method of the composite material and its application in shoe materials. The weft-knitted spacer fabric is composed of three parts: the upper surface layer, the spacer yarn in the middle and the lower surface layer. Through the tucking of the spacer yarns on the upper surface layer and the lower surface layer, the upper surface and the lower surface layer are connected to form a three-dimensional structure. structure. The difference in the needle selection tuck mode changes the connection distance and connection quantity of the tuck, and under the action of the upper and lower surface layer elastic yarns, the thickness of the spacer fabric and the arrangement density of the spacer filaments are changed. The shoe sole material of the present invention can eliminate the lodging phenomenon of the weft-knitted spacer fabric under repeated pressure and improve the strength of the polyurethane foam, and can change the thickness of the spacer fabric and the arrangement density of the spacer threads according to the change of the thickness of the sole and the bearing conditions of different parts. Thus, the overall reinforcement of the sole based on polyurethane foam is carried out.

Description

technical field [0001] The invention relates to a weft-knitted spacer fabric and a preparation method thereof, a polyurethane (polyurethane, PU for short) foam composite material comprising the fabric, a preparation method of the composite material and its application in shoe materials. Background technique [0002] The sole is an important part of all types of shoes to withstand compressive loads. Especially for sports and fitness shoes, the sole should have good compression elasticity, shock absorption, durability and lightness, so as to provide comfortable support for the wearer and relieve the fatigue of the foot when walking. Knitted (including weft-knitted and warp-knitted) spacer fabrics (also known as three-dimensional fabrics, three-dimensional fabrics) are a three-dimensional structure formed by connecting the upper and lower surface layers through spacer wires. This three-dimensional structure characteristic determines The knitted spacer fabric has good propertie...

AI Technical Summary

Problems solved by technology

The weak point of this invention is: when the machine number of computerized flat knitting machine determines the gauge of its front and rear needle beds, the range of changing the coil length of the spacer wires between the front and rear needle beds (that is, adjusting the thickness of the spacer fabric) is very limited.

The disadvantages of the above insoles comprising knitted spacer fabrics are that the support element is an additional insert, which is not integral with the knitted spacer fabric, and is prone to breakage of the two parts; moreover, apart from the support elements, the rest of the sole is only made Knitted spacer fabrics bear compressive loads and have poor load-bearing properties

[0012] As can be seen from the above, there are still defects in the spacer fabrics of the above-mentioned prior art

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