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Felting needle is the key accessory of needle loom. There are many manufacturers in China with insufficient mutual communication, and there is no uniform standard constraint. Therefore, this standard is formulated according to the requirements of the industry standard revision plan of the Technical Equipment Department of China National Textile Council in 1994.
According to the actual use requirements in China and referring to the relevant parameters of similar products such as GROZ-BECKERT and FORSTER-NEEDLE, this standard makes a series of regulations on the product representation method, main technical parameters and technical requirements of felting needles, so as to further improve and stabilize the product quality of domestic needles.
Triangular needles are the main products of this standard. Flat needles, star needles, fork needles and special-shaped needles have not been produced on a large scale in China at present, so they have not been specified in detail, and will be supplemented when the standard is revised in the future.
This standard was proposed by Technical Equipment Department of China National Textile Council.
This standard is under jurisdiction of Shanghai Textile Machinery Research Institute.
Felting needles
1 Scope
This standard specifies the terms, code, product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of felting needles (hereinafter referred to as needles).
This standard is applicable to triangular needles for nonwoven needle looms, and other styles of needles used on nonwoven needle looms may also be referred to.
2 References
The following standards contain provisions which, through reference in this standard, constitute provisions of this standard. At the time of publication, all editions listed are valid. All normative references are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the latest editions of the normative standards indicated below.
GB 2828-87 Sampling procedures and tables for lot-by-lot inspection by attributes (Apply to inspection of successive lots or batches)
GB 2829-87 Sampling procedures and tables for periodic inspection by attributes (Apply to inspection of process stability)
GB/T 4342-91 Metallic materials — Vickers microhardness test
3 Product classification
3.1 Terminology
3.1.1
felting needles
device of the needle loom, which uses its barbs to repeatedly puncture the fiber web
3.1.2
nominal length
distance (L1) from the point to the inside of the crank
3.1.3
working edge
working part of the felting needles
3.1.4
barb
gap part in the working edge
3.1.5
barb angle
angle (α) of the opening of the barb
3.1.6
Kick-up
convex part of the barb
3.1.7
barb depth
depth of the barb
3.1.8
barb distance
distance (L3) between two adjacent barbs on same edge
3.1.9
crank
part of the tail end of the needle bent at 90°
3.1.10
crank position angle
angle (θ) between the symmetrical center line of the cross section of the working edge and the axis line of the crank shaft
3.1.11
broken angle
angle (β) at which the working part is bent to break under force
3.1.12
point style
shape of needle point
3.2 Styles
According to the structural characteristics, needles may be divided into the following styles:
a) Triangular needle (the working part section is a regular triangle);
b) Flat needle;
c) Star needle;
d) Fork needle;
e) Conical needle;
f) Other special-shaped needles.
3.3 Basic structure
See Figure 1 for the point style of the needles, and Figure 2 for the basic structure and names of each part of the needles.
Figure 1
L4——the distance from the first barb to the point; h——the regular triangle section height
Figure 2
3.4 Representation of product model
The product models are written in the following order:
Example of product marking: triangular needle 15 × 18 × 34 × 3.5RA3332112
Foreword i
1 Scope
2 References
3 Product classification
4 Technical requirements
5 Test methods
6 Inspection rules
7 Marking, packaging, transportation and storage
