Biomedical Engineering Reference
In-Depth Information
technology and the “three wastes” treatment technology were constantly evolving.
However, there are still many problems that need to be solved. First, the devel-
opment of regenerated cellulose fiber resources lacks an overall planning and
promotion scheme at the national and industry levels.
Second, the related core technology of regenerated cellulose fiber resources
needs to be strengthened. Now, regenerated cellulose fiber has irreparable defects
brought about by techniques: The structural stability is poor; the wet strength
accounts for 38-42 % of the dry strength, especially with textile shrinkage more than
10 %; the strength is low, with the strength of regular viscose generally less than 24.7
cN/dtex; and the pollution is serious as the conventional viscose production routes
have the large amounts of waste gas and waste water [
7
].
Third, the stable supply of the regenerated cellulose fiber resources is a problem.
In the current production of viscose fibers in China, cotton pulp accounts for more
than 60 %. Because of the slight growth of international cotton output, the growth
of cotton pulp resources is also limited. Wood pulp is the best supplement for
cotton pulp, but wood resources in China are small, especially wood available for
pulp production. Productivity of bamboo and hemp pulp is limited because of high
costs.
Finally, the development of renewable cellulose fiber and its products lacks
a view of scientific development. Some enterprises have quick success in the
promotion of new products. They exaggerate some properties of the product,
avoiding their shortcomings and deficiencies. These are detrimental to sustained
and healthy development [
8
].
To solve these problems, researchers need to solve the following problems
in the development of regenerated cellulose fiber: (1) The contradiction between
functional materials and fiber strength needs a solution. Generally, to ensure the
strength of the regenerated fibers, lignin and other low molecular weight substances
need to be removed for the most part. In this process, antibacterial substances
are likely to be easily reduced, causing the loss of active ingredients of the
natural materials and reducing the utilization level of resources. (2) There is need
for increased research in implant technology of functional substances. To study
nonblended grafting technology, it is necessary to appropriately increase the content
of useful substances in the pulp and the technical content of regenerated cellulose
fiber and to expand its applications. (3) The differentiation of structure must be
solved. The differentiations of synthetic fiber have partially reached or overstepped
the degree of natural fiber function; however, the differentiation of regenerated
cellulose fiber far from initiation. The differentiation of structure in the regenerated
cellulose fiber system has some technical difficulties; especially in the case of low
strength, differentiated processing is more difficult. Cross-linking, synthesis, and
other combination techniques for producing new viscose fiber can be used to explore
a new fiber-processing line and promote the differential production of regenerated
cellulose fibers.
