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Quantitive investigating method and instrument for leather softness

A technology of quantitative determination and measuring instrument, applied in the direction of testing material hardness, etc., can solve the problems of excessive deformation of leather destructive leather test parts, difficult to popularize and apply, complex data processing, etc., and achieve simple structure of measuring instrument, test operation and data Easy to handle and easy to use in industrial applications

Inactive Publication Date: 2006-06-28
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above methods have beneficially discussed the quantitative measurement and characterization of leather softness from different angles, but it is difficult to be popularized and applied in production practice due to destructive effects on leather or excessive deformation of leather test parts, as well as complex data processing.

Method used

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  • Quantitive investigating method and instrument for leather softness
  • Quantitive investigating method and instrument for leather softness
  • Quantitive investigating method and instrument for leather softness

Examples

Experimental program
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Effect test

Embodiment 1

[0040] The structure of the leather softness measuring instrument in the present embodiment is as shown in Figure 1, comprises base 1, the support 2 that is connected with base, the meter 5 that is installed on the support, the counterweight 4 that combines with meter, pressure head 6 and the handle 3, the stage and the anvil 7 combined with the base. The base 1 is provided with a groove-type guide seat, and the anvil 7 is installed on the groove-type guide seat of the base, and its installation position corresponds to the indenter 6 . The loading platform is composed of a longitudinal sliding table 9 and a lateral moving sliding table 10. The structures of the longitudinal moving sliding table 9 and the lateral moving sliding table 10 are as follows: figure 2 , image 3 As shown, the longitudinally moving slide table 9 is combined with the trough-type guide seat of the base through the chute at the bottom; There is a leather limit plate 15 at one end of the sliding table pr...

Embodiment 2

[0042] Present embodiment measures the softness of point a of pigskin, and point a is positioned at the neck of pigskin, with the measuring instrument described in embodiment 1, the diameter of instrument indenter is 10mm, and step is as follows:

[0043] (1) Determine a square on the pigskin with point a as the center. The side length of the square is twice the diameter of the indenter of the measuring instrument. A horizontal axis (X axis) and a vertical axis (Y axis) are determined through point a. The axis is parallel to a set of side lengths of the square, and the longitudinal axis is perpendicular to the transverse axis, such as Figure 4 shown.

[0044] (2) Under a constant pressure of 350g, measure the four right-angle vertices a of the square 1 、a 2 、a 3 、a 4 Single layer thickness value H at 单 , respectively H a1 =1.062mm, H a2 =1.060mm, H a3 =1.060mm, H a4 = 1.100 mm.

[0045] (3) Fold the pigskin along the transverse axis passing through point a, the righ...

Embodiment 3

[0052] This embodiment measures the softness value of pigskin vest portion, buttocks and abdomen, and the selection of measuring points in each portion area is as follows: Figure 7 shown. With measuring instrument described in embodiment 1, the diameter of instrument pressure head is 10mm, and the constant pressure that applies is 350g, and step is as follows:

[0053] 1. Determination of softness value of pigskin vest

[0054] Select 4 measuring points a, b, c, d in the measured pigskin vest region, and measure the single-layer thickness value H of each measuring point in the pigskin vest region by the method of embodiment 2 单 and the coincident thickness value H for folding along the horizontal axis and folding along the longitudinal axis 重 , the measured data are as follows (in mm):

[0055] (1) Measuring point a

[0056] Single layer thickness value H a1 =1.218H a2 =1.217H a3 =1.220H a4 =1.210

[0057] Coincident thickness value H a1-2 =2.868H a3-4 =3.012H a1-...

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Abstract

The invention is a quantity measuring method for leather softness, includes the quantity measurement to some point on the leather and the region on the leather. The method uses the relation between the leather softness and the bending resisting intensity and the compressing performance as principle, measures the thickness H (single) in extended state and the thickness H (double) in folding state, the difference between them is used to represent the softness of the leather, the softness=H (single) / H(double)-H(single). The measuring device matching with above mentioned method is an improvement to the current thickness measuring device, the improvement is: the object carrying desk is designed into movable type, made up of lengthwise moving desk and transverse moving desk; the balance weight is adjustable, made up of balance blocks with different specification.

Description

technical field [0001] The invention belongs to a method for quantitatively measuring leather softness and a measuring instrument, in particular to a non-destructive measuring method and measuring instrument for leather softness. Background technique [0002] Softness is an important index to evaluate the quality of leather, but because leather is an anisotropic material composed of many fiber bundles with different thickness and compactness, its properties are very uneven, so "softness" is usually used as a Qualitative concept, no quantitative standard. It is understood that the evaluation of leather softness in actual production still mainly adopts the traditional method - "hand feeling method", that is, the softness of leather is given a grade based on the feel of experienced tannery experts or / and tannery workers. Although this method is simple, the evaluation results are subjective, accidental and non-parallel, and cannot objectively and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/40
Inventor 李志强余凤湄廖隆理陈敏
Owner SICHUAN UNIV
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