Patent ID: 6399523
Filing Date: 2002-06-04
Classification: A01G,C09K,D04B,D10B,E02D,Y10T

Abstract:
A three-dimensional net formed by warp knitting comprising:three-dimensional string portions each defining net mesh opening spaces in the three-dimensional net and being continuous in a knitting direction and including a front-side fabric portion and a back-side fabric portion, each knitted at a width for one or a plurality of wales by warp knitting, and connection yarns for connecting both the front-side and back-side fabric portions with a gap therebetween, through which water and air are transmittable; and the front-side and back-side fabric portions of each three-dimensional string portion being alternately joined with rightward and leftward adjacent three-dimensional string portions at every predetermined pitch in the knitting direction, each of said front-side and back-side fabric portions having a knitting repeat pattern, the knitting repeat patterns of said front-side and back-side fabric portions being offset from one another by a half repeat, wherein: a position of the joining portion at which the front-side fabric portion of one three-dimensional string portion is joined to the adjacent three-dimensional string portion is displaced along said one three-dimensional string portion from a corresponding position of the joining portion at which the back-side fabric portion of said one three-dimensional string portion is joined to the adjacent three-dimensional string portion; the connection yarns between the front-side and back-side fabric portions of each three-dimensional string portion are alternately inclined leftward and rightward at every predetermined pitch in the knitting direction while inclination of the connection yarns in every adjacent two of the three-dimensional string portions are in a manner of offsetting each other, so that the connection yarns extended from each of the joining portions to rightward and leftward ones of the three-dimensional string portions are in opposite inclinations to constitute a truss structure; and a thickness-wise stress applied onto the front-side or back-side fabric portion is converted to a horizontal stress applied to back-side or front-side fabric portion by way of the connection yarns inclined leftward and rightward from each of the joining portion to resist collapsing.