Physical Properties of Laminated Fabrics

Abstract

This article deals with the thickness, weight, air permeability, warmth rentention percentage, stiffness, etc. of laminated fabrics. Changes in these properties affect the design of laminated fabrics.
The relations between these properties of a laminated fabric and those of its pre-lamination surface and lining have been theoretically and experimentally analyzed with these experimental results:
(1) The thickness of a laminated fabric is calculable from the sum of the thickness of its surface and lining. The adhesive used has a slight bearing on thickness.
(2) The weight of a laminated fabric is calculable by adding the constant determined by the laminating conditions to the sum of the weights of a surface and a lining.
(3) The air permeability of a laminated fabric, V_B is expressible by: V_B=KV_FV_L/√<V_F²+V_L²> where V_F=the air permeability of a surface, V_L=the air permeability of a lining, K=correcting coefficient.
(4) The warmth retention percentage H_B of a laminated fabric is expressible by: 1/1-H_B=1/1-H_F+1/1-H_L-1 where H_F=the warmth retention percentage of surface, H_L=the warmth retention percentage of lining.
(5) The stiffness of a laminated fabric, GB is expressible by: G_B=G₁(1+t³₂/t³₁)+3G₁(1+t₁/t₂)²/G₁/G₂+t²₁/t²₂ where G=stiffness of fabric, t=thickness of fabric.
Suffix 1 shows which is smaller in Young's modulus, surface or lining.
Suffix 2 shows which is larger in Young's modulus, surface or lining.