The Pre-set Peeling Testing Method of the Hydroetangling Wood Pulp-PET Fiber Composite Web Materials

Hydroetangling wood pulp-PET fiber web, which is an excellent wipe material. But some fate short coming-particle peeling, arising when it used as wipes, and the peeling particle would do harm to some devices. Therefore, this case even worse when the fabric damping. The four pre-set peeling tests have been signed for this phenomenon, which have imitated some situations of the pre-set peeling under the mechanics functions. The statistics from these tests, combined the analyzing of the different raw materials and processes of the hydroetangling wood pulp-PET fiber web, are regular and convincible. So it is indicate that the pre-set peeling conditions can be explained well by these four testing methods, which are reasonable and feasible.

Hydroetangling wood pulp-PET fiber web is an excellent wipe material, for it has good flexibility, drapability, moisture absorption and dust absorption (Xing, 2003, p.165-178).But its particle peeling is deadly short coming.For example, there will be some particle peeling when wiping the precision electronic products, that seriously affect the performance of the electronic product, especially after absorbing moisture (Shen, 2003, p.105-114).Some wood pulp-short fiber is easily floating, for it is not fully entangled with polyester fiber in spunlacing district (Ma, 1999, p.25-27), that is why wood pulp cloth easily particle peeling by outside force.But now there is none usefully testing method and uniformly standard by international.It makes factory and customers inconvenient.
In this paper, it is mostly analysis the problem of wood pulp composite cloth's particle peeling.The four pre-set peeling tests have been signed for this phenomenon, which have imitated some situations of the pre-set peeling under the mechanics force.The statistics from these tests, combined the analyzing of the different raw materials and processes of the hydroetangling wood pulp-PET fiber web, are regular and convincible.

Materials
Six sample of hydroetangling wood pulp-PET fiber web (the wood pulp fiber > 2mm more than 90%); sample A, B, C and D has the same rational number of spunlacing (6-8), E has 11-14, F more than 15; sample A and E is 70g/m 2 , B, C, D and F is 68g/m 2 ; the ration between wood pulp tissue and polyester is 55:55 (A, B, E), and 60:40 (C, D, F).

Design of Particle Peeling Testing Method
Samples should be prepared by the treatment of gas conditioning before test, 24h (Guo, 1998, p.22-23) in the state of standard atmosphere or in the same condition.The test must be repeated three times, and calculate the average.

Disk Abrasion Method
It is imitated the situation of grating.There is two abrasion method: grinding wheel and wrapped by cloth grinding wheel abrasion.The first method produce: weigh the disk sample (Φ11, signed W 1 ), choose 280# grinding wheel, 6r/min, 5min, signed W 2 after abrasion, then calculate the particle peeling ratio.

Beat Method
It is designed for the state of mechanical colliding.The sample (30*30cm) signed W 1 .Hanged the sample, connected vertical sample by electric fan, beat 5min.Weighed the sample after particle peeling and signed W 2 .

Garment Wash Method
Hydroetangling wood pulp-PET fiber web sometimes need to be dropped liquid, as operating coat would be adhibited blood and liquid medicine.This case makes different particle peeling.The test is imitated the particle peeling in the flexibility of damp.The sample (30*30cm) signed W 1 .washed in the fabric web.The conditions see as table 1. Dried, Weighed the sample particle peeling and signed W 2 .

Adhesive Tape Affix Method
Some wood pulp-short fiber is easily floating, for it is not fully entangled with polyester fiber or itself, that is why wood pulp cloth easily particle peeling by outside force.The adhesive tape affix the Hydroetangling wood pulp-PET fiber web, then separate, the tape would take floating short fiber away.The mount of short fiber is to estimate the particle peeling.
The sample (5*20cm) signed W 1 , took the same size tape affix fiber, then planished and separated, repeated three times, then weighed the fiber signed as W 2 .

Result of Test
The ratio of peeling can be seen from Table 2.The result accord the product characteristics.The different methods fluctuate the ratio a lot or have no rule.For example, the peeling ratio of sample E (beat method) is 0.07%, least, compared with other samples, also with other methods.It is showed that the peeling of the product is little, and any method can illuminate the characteristics.
Table 2 also shows that the ratio of peeling is related with the techniques.Sample C and D (68g/m 2 , wood pulp tissue and polyester is 60:40, same rational number of spunlacing), sample D has a row in the forth rational number, and sample C has two, which entangles closer, it makes the ratio peeling of sample C is smaller than sample D. By garment wash method, sample D is 13.19% and C is 5.73%.otherwise, seen from sample E and F, the rational number of E is little than F, but E is 70g/m 2 , wood pulp tissue and polyester is 60:40, and F is 68 g/m 2 , 60:40, it makes the ratio peeling of E is smaller than F. For instance, E is 0.09% and 0.02%, compared with F being 0.21% and 0.09%, by disk abrasion method.In conclude, the four testing methods can reflect the degree of the product particle peeling, the statistics from these tests, according with the characteristics, are regular and convincible.So it is indicate that the pre-set peeling conditions can be explained well by these four testing methods, which are reasonable and feasible.

3.2Comparison of Experiment
There is none available method in domestic research, the aim of the experiment is to imitate some condition, reflect the degree of hydroetangling wood pulp-PET fiber web.The four methods have their own specialty.The disk abrasion method imitates the mechanical friction, it is mostly close to the practical situation, reflect the particle peeling truly, but it is too cockamamie, losing little fiber itself), the scales changes little, so it requires instrument precision.
The garment wash method is changed much after washing, it can imitate actually circumstance by agitating and kneading, mostly adapt to inspect product for medical treatment and sanitation.Because the product needs to absorb blood and medicine liquid, also it is bear outside force.The beat method uses instrument easily but the ratio of particle peeling is smaller than disk abrasion method, adhesive tape affix method is mostly simpleness and have better effect, the loss is only lower than garment wash method.This is used by some medicine treatment manufacture which is clung together easily.
In a word, the comparison can be concluded by table 3.

Conclusion
(1) There is no standard and available method in testing peeling of hydroetangling wood pulp-PET fiber web.The design can solve two problem: firstly, imitate some peeling situations, secondly, extend methods to other nonwovens.
(2) By the analysis of experiment, it is indicated that the four methods are realistical, reasonable and feasible.
(3) The four testing methods have their own characteristics, can inspect different functional hydroetangling wood pulp-PET fiber web, and select different method for different request, using reasonable.

Table 1 .
The washing conditions

Table 2 .
The pre-set peeling percentage of different tests (%)

Table 3 .
The four pre-set peeling tests comparison