Views:3 Author:Site Editor Publish Time: 2020-12-15 Origin:Site
Fresh-keeping film and fresh-keeping bag are commonly used plastic packaging products for fresh-keeping food, and many families cannot do without them.
How to use PVC cling film
Since pvc cling film is cheaper than other plastic wraps, many families still choose pvc cling film. In fact, as long as pvc cling film is not heated and does not touch greasy food, it is not a problem to just use it to keep fresh fruits and vegetables.
PVC cling film is also polyvinyl chloride. Due to the requirements of the production process, a large amount of plasticizer is added during the production of PVC cling film, which is what we usually call plasticizer. If the PVC cling film is used under heating or in contact with oily food, the plasticizer contained in the PVC cling film is easy to separate out. As the food is brought into the human body, it will cause certain harm to the human body, and even cause cancer. However, there is no problem with using PVC cling film to keep fresh fruits and vegetables fresh.
Types of plastic wrap
Most of the cling film and commonly used plastic bags on the market are made of ethylene masterbatch as raw material. According to the different types of ethylene masterbatch, cling film can be divided into three categories.
The first is polyethylene, or PE for short. This material is mainly used for food packaging. This film is used for the fruits and vegetables we usually buy, including the semi-finished products purchased in the supermarket.
The second type is polyvinyl chloride, or PVC for short. This material can also be used for food packaging, but it has a certain impact on the safety of the human body;
The third type is polyvinylidene chloride, or PVDC for short, which is mainly used for the packaging of cooked food, ham and other products.
At present, food cling film is divided into polyethylene, also known as PE cling film, polyvinyl chloride, also known as PVC cling film, etc. according to the material. Among them, PE cling film is mainly sold in various supermarkets, while PVC cling film is mainly used for food packaging in the fresh and bulk food areas of supermarkets. In addition, various hotels and restaurants and other group customers purchase and use more. Among all kinds of plastic wrap, PVC has the largest market share due to its low price, about 60% to 70%.
Due to the requirements of the production process, a large amount of plasticizer, also known as plasticizer, is added during the production of PVC cling film. Plasticizers are insoluble in cold water, but will dissolve out at temperatures above 60 degrees Celsius or in grease.
Experts remind consumers that it is best to buy and use PE plastic wrap. If you use PVC cling film, it is best not to directly use it for packaging meat, cooked food, and fat-containing food, nor to heat it directly in a microwave oven.
The difference between PVC and PE plastic wrap
The salient features of PE cling film are: PE cling film is widely used, PE cling film can wrap oily food, and PE cling film can also be heated in a microwave oven at a temperature not exceeding 110 degrees Celsius. In addition, tips to distinguish different types of plastic wrap:
1. Look at transparency. PE cling film has poor transparency, while PVC cling film has better transparency.
2. Pull experiment. PE cling film has low tensile force, while PVC cling film has high tensile force.
3. Fire experiment. PE cling film is easy to burn, dripping oil, and smells like candles; PVC cling film burns and emits black smoke, producing a pungent smell.
4. The self-adhesiveness of PVC cling film is much stronger than PE cling film.