What should we do if the finished fabric has a peculiar smell?

The fabric has peculiar smell, which is generally unacceptable to customers. Except for the specified aroma finishing, normal fabrics are required to have no special odor. When there is odor, we need to know how to prevent and find the source of the problem. This article describes some odors. Causes of production and printing and dyeing auxiliaries that may produce peculiar smells.

The peculiar smells mainly include musty smell, high boiling range petroleum smell, aromatic hydrocarbon smell, fishy smell, etc., which are explained below:

Musty smell

Musty smell is mainly produced by microorganisms such as bacteria, fungi, etc., which decompose organic matter on textiles to excrete metabolites. Because there are many types of microorganisms and are greatly affected by the environment, musty smell is a general term for a type of smell. During the production and processing of textiles and garments, due to improper process arrangements, long construction periods and humid environment, microorganisms are easy to breed; the storage environment of the warehouse is relatively humid, and environmental factors such as wet and rainy weather during transportation may cause musty smell.

High boiling range petroleum flavor

In spinning and textile printing and dyeing, some auxiliaries are often used as lubricants or solvents containing mineral oils such as gasoline, diesel oil, and kerosene. For example, chemical fibers are often added with some oils to reduce friction and static electricity during spinning: when wool is opened, add crude oil to nourish static electricity, improve the opening effect and reduce fiber damage; the EHLB value of kerosene is 6-9, which is often used as a dispersion. (For example, the binder BH uses kerosene as a dispersion), and it is often combined with water and emulsifier to form A paste as a thickener for paint printing; some oil agents used by machines in the production of clothing, etc., these factors will give textiles. Brings the smell of petroleum.

Aromatic hydrocarbon odor (or aroma)

Aromatic hydrocarbons are the general term for hydrocarbon compounds containing benzene rings. In the production, printing, dyeing and finishing process of textile and clothing, the textile auxiliaries used often contain aromatic hydrocarbon compounds such as: benzene, phenol, styrene, toluene, xylene, aniline, benzoic acid, etc. In addition, fragrances are used to mask odors and introduce unpleasant aromatic odors.

fishy smell

The fishy odor is mainly caused by the by-product trimethylamine [N(CH3)3] produced during the baking process after the textile is finished with resin. However, some by-product trimethylamine will exist on textiles in the form of formazan salt, and then decompose trimethylamine during storage or consumption, resulting in an unpleasant fishy smell.

Printing and dyeing auxiliaries may produce odor related auxiliaries, which are for reference only, and actual problems are actually analyzed.

preprocessing

1. Degreasing agent (xylene, tetrachloroethylene, dibutyl phosphate, etc.)

2. Low temperature pretreatment agent (solvent)

dyeing

1. Repair agent (carrier: methylnaphthalene, methyl salicylate, dibutyl ester)

2. Glacial acetic acid sour (change to citric acid and other tasteless acids)

3. Fixing agent fishy smell (including dimethylamine, trimethylamine)

4. Modifiers (phenol, formaldehyde, dimethylamine, trimethylamine, etc.)

5. Acid reduction cleaning agent

printing

1. Dye discharge agent (such as white powder, deguxin, etc.)

2. Adhesive

finishing

1. Resin

2. Coating: PU

3. The peculiar smell of silicone oil (the taste of emulsifiers and solvents, the taste of raw materials, finished products, and by-products of silicon products)

4. The taste of fatty acid softener