Desizing enzyme introduction
At present, the main desizing enzyme product used in the textile industry is α-amylase, which is used to remove the starch size and prepare for the subsequent dyeing process. Compared with chemical method, it has the advantages of not damaging the fiber and environmental protection. Well, I will take this opportunity to help you analyze the various performance differences under my microscope, and help you to answer questions.
Generally sellers only tell two points to the customers: recommended dosage and price. Oh my god! Are you kidding me?
The first thing to look at is the application device, and the performance that translates into the product itself is: temperature.
The process by continuous desizing machines is generally to pad and steam/dwell in 60-80 degree. The requirement of the desizing enzyme is that the activity is stable at high temperature, and the temperature in the equipment sometimes reaches 95 degrees or even 100 degrees. If the temperature resistance property of the enzyme is not strong, the rapid decrease of activity would inevitably deteriorate the desizing effect. Therefore, such high temperature desizing enzymes is needed.
Cold-pad-batch is also one of the common energy-saving desizing equipment, but due to climate reasons, the temperature difference between winter and summer is totally different, although the padding temperature can be higher, and the plastic bag is packed, but the temperature drops down within half day. The rate and the stable temperature are different, and it is generally required to select a medium-low temperature type desizing enzyme. Please note that if the customer chooses a high temperature product, the activity will usually be quite low under such temperature conditions and the desizing effect will be very poor. Therefore, the choice of enzymes is still very important.
Attach a graph of product vitality to explain the difference.
This performance covers a wide range of applications including stability of application, stability after formulated, and storage stability. My understanding of the stability of application is that the enzyme product need to be compatible to electrolyte interference, including passivation and deactivation, and is easy to adapt to relatively broad pH and temperature. Regarding the stability of formulation, it needs to minimize the loss of activity and to ensure a certain shelf life. Some customers often ask why the effect is much lower after formulating, besides the stability of the enzyme itself, water quality and other additives are also important. The stability of formulated enzyme products of different manufacturers varies a lot sometimes.
There are some other interesting points such as pH range condition and color shade. Generally, the adapted pH value of the products of global companies is relatively wide, which is in weak acid conditions. However, there are some customers request to adapt to alkaline condition, it is not easy but we can supply as well. In some desizing process customers want to control the color shade of the fabric, which is the denim needs to turn Bluish. At present, we are able to meet the requirements of customers.
Well, some customer might ask, why can't manufacturers produce a product that adapts to the widest pH, temperature and optimum stability? My analysis is that the choice of enzyme species and the limitations of the production process are the main fundamental reasons. The difference between enzymes is like human DNA. Humans seem to be the same in appearance but actually there is huge gap between marathon runners and sumo wrestlers. Industrial production needs to be selected from a wide range of enzyme species. The appropriate enzyme species need to be isolated, and then cultivated and genetically engineered to obtain the most suitable ones. In this step, the performance of the enzyme has been determined already including suitable pH range, temperature range and compatibility. Next, due to the production level of equipment and processes of various manufacturers, industrial enzyme products with different activity, different purity and different price costs are differentiated. The enzyme product is not an ordinary chemical product. It can’t be produced by some reactors in a few years. It requires a lot of technical accumulation, including collecting, researching, developing and producing.
Finally, to answer a question that many customers have asked during the communication process: Can amylase remove PVA size or other mixed size? The answer is no. Because amylase has no effect on PVA only for starch, but those size can still be removed by water in a certain high temperature.
Last but not least, our strength of enzyme product is that we understand enzyme and its application better due to continuous accumulation. Let us know if you have any request.
Shanghai ChemGeek Chemical Co., Ltd.