How to use whitening agent in film blowing

Blow film products can be seen everywhere in our life, such as supermarket shopping bags, greenhouse films, fresh-keeping films and so on. Most of the film blowing products we see are very transparent or white. This is because during the film blowing process, due to the high processing temperature, the blown film is prone to yellowing and insufficient whiteness. In order to avoid this situation, most manufacturers choose to add a small amount of film blowing fluorescent whitening agent in the production process, So how to use the fluorescent whitening agent used in film blowing? Now Shanghai enmai will give you a detailed introduction of how to use fluorescent whitening agent for film blowing.

 

First of all, we need to prepare 200 kg of plastic particles for standby. Then, according to the weight of plastic particles, the fluorescent whitening agent is added according to 2 / 10000, that is, about 40 g is added. If the recycled material is used, the amount of whitening agent will increase accordingly.

 

When the raw materials and whitening agent are ready, use the mixer to start mixing 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.

 

Finally, according to the normal work flow of the film blowing process, the film blowing products with fluorescent whitening agent can be made. At this time, we can see that they will be very transparent.

 

In the use process, there are two very important points, that is, when adding whitening agent, you must find the appropriate amount (you can consult the whitening agent manufacturer), must not add too much, the other point is that the whitening agent and raw materials must be fully stirred evenly, so as not to affect the effect of the product.