The secret of transparency and brightness of blown film products

Blow film products can be seen everywhere in our life, such as supermarket shopping bags, greenhouse films, preservative films, etc. The new materials of blown film products we see are very transparent or white. However, if some recycled materials are added, the blown film will turn yellow and the whiteness is not enough due to the high processing temperature. In order to solve this problem, the manufacturer will add a small amount of fluorescent whitening agent in the production process, But the choice of the quality of fluorescent brightener is very important. Generally speaking, blown film products are required to be transparent and bright. Only pure OB-1 can be selected, so that the transparency will not be affected and the product will be transparent. So how to add fluorescent brightener to blown film products? Shanghai enmai chemical tells you.

 

1. First of all, we need to prepare a pot of raw materials, such as 250 kg. Then, according to the weight of the plastic particles, the fluorescent whitening agent is added according to 0.5% of the ten thousandth. If there are more recycled materials, the amount of whitening agent will be increased accordingly.

 

2. The raw materials and whitening agent are ready. At this time, use a mixer to fully mix the whitening agent and plastic raw materials. The mixing time is about 5-10 minutes, so that the fluorescent whitening agent can be fully dispersed in the plastic particles.

 

3. According to the normal work flow of the film blowing process, the film blowing products with fluorescent whitening agent are made, which look very transparent and faint blue.

 

In the process of use, there are two points to be noted, that is, when adding fluorescent brightener, we must find the appropriate amount, must not add too much, you can start from a small amount, and then gradually increase the amount; Another point is that the fluorescent whitening agent and raw materials must be fully stirred evenly, so as not to make the product white and yellow.

 

Shanghai enmai Chemical Co., Ltd. is a professional manufacturer of plastic fluorescent whitening agent. If you have any problems about whiteness that can not be solved, you can consult us. We provide you with professional technical guidance and one-to-one technical service!