1. The Quality Change of Soap and Its Causes
- cracking. Also known as spallation or three splints, is the phenomenon of soap body splitting. The reasons are improper formulation of raw materials, excessive rigid oil, excessive alkali content in soap base and excessive sodium chloride content in the soap base.
- white frost. The appearance of a layer of white powder or granular crystals on the surface of the soap. The main reason is the high alkali content in the soap body or the excessive content of low molecular fatty acids. This kind of soap can irritate or damage the skin and clothing. The state stipulates that laundry soap should not seriously frost.
- sweating and rancidity. Sweat refers to the appearance of droplets of water or oil on the surface of the soap. Water droplets are the result of soap moisture absorption. When the relative humidity reaches above 85%, the laundry soap will appear in different degrees of water droplets. Soap rancidity is essentially the rancidity of unsaponifiable oils in soap. The main reason is that there are more unsaponifiable oils and unsaturated fatty acids in the soap body and the environmental temperature are higher.
- frost crack and shrinkage deformation. Freeze cracking is a phenomenon of whitening and tissue cracking of soap caused by freezing. The main reason for shrinkage and deformation of soap in storage is excessive water content in soap. Freeze cracking destroys the soap body, while shrinkage deformation affects the appearance quality.
- soft. When the soap body is gently pinched by hand, the filling collapses. The reason is that the amount of solid oil in the formula is small, the saponification is insufficient or the glycerol is too much. This soap has poor durability and sticky handle when used. In addition, due to the low quality of oil used, inadequate decolorization and deodorization will result in the odor and color of the soap.
2. Soap Maintenance
1) packaging. Laundry soap is usually not packed inside. High-grade laundry soap is packed with wax paper and lined with moisture-proof paper in the box.
Soap must be packaged in paper or carton. Paper used for packaging paper and carton should be compact and waterproof to prevent moisture and aroma diffusion, and to protect and beautify the appearance of soap.
The packaging specifications of soap are not uniformly stipulated by the state and are formulated by the production enterprises themselves. Common laundry soaps are 250, 270, 300 grams; soaps are 70, 80, 90, 100, 120, 140, 150 grams.
2) Maintenance. Soap in storage should pay attention to moisture-proof, heat-proof, freeze-proof, pressure-proof. When soap is wet or heated, it will dehydrate, soften, sweat and acid. When soap is frozen, it will freeze and crack. When soap is compressed, it will easily deform or break up. The storage of soap should be ventilated, the temperature in the storage should be between O and 35 C, and the relative humidity in the storage should be kept between 60% and 80%. When stacking, it should be padded 20 cm above the ground, 20 cm apart for each stack and the stacking should not be too high.
The shelf life of laundry soap is 15 months, and the storage of soap generally does not exceed one year.
3. Cautions for Soap Use
First, when using laundry soap, it is better to prepare soap solution with warm water. The experimental results show that 0.2%-o.5%. The concentration of the soap solution has the strongest surface activity, which is conducive to a faster and stronger scale removal efficiency.
Second, laundry soap is alkaline, soap solution soaking clothes should not be too long, 30 to 100 minutes is appropriate, in order to prevent damage to clothing fibers. Silk and wool fabrics should not be washed with ordinary soap.
Third, unused soap should not be taken apart. It should be placed in a dry, odorless, sunless place to prevent fragrance and fragrance.
Fourthly, soap should be put in a clean and dry soapbox after use to prevent the body from being deliquescent and gelatinized. If there is deliquescence, it should be put in a cool and ventilated place to dry.