The
health of food is a topic that people have always cared about,
especially children, because resistance is weaker than adults. Therefore,
for the quality of food, people have invented the wrap film packaging
machine, as the name suggests is the machine for the production of
plastic wrap, then what is the use of cling film? Let's get to know it with Xiaobian.
The
first is to isolate it from the air. This is not difficult to
understand. It can keep the vegetables, fruits, cold meat and other
fresh foods fresh and not polluted by external dust, bacteria and
microbes. In everyone, you should know that plastic wrap can be used to
moisturize. Some
of these crushes also use plastic wrap to lose weight, while plastic
wrap packaging machine uses cling film to prevent the evaporation of
water in the food; the third is to maintain food nutrition is not
destroyed.
To achieve these three functions, not all plastic films can be made. It
can not be said that the agricultural mulch film and the relatively
thick plastic film are used as plastic wrap, but if it is too thick, it
will cause the food not to "breath", and it is easy to anaerobic
fermentation, thereby decaying and decaying. “Even
if it is a qualified plastic wrap, the wrap can be kept fresh, and the
two layers are not preserved. The plastic wrap not only insists that the
water is not volatilized, but also allows the carbon dioxide inside to
come in. The oxygen outside can come in, just like a mask. If it is too thick, people can't breathe.
Look at the variety of wrap film on the market with Xiaobian:
The
first type is polyethylene, referred to as PE. This material is mainly
used for food packaging and has a high temperature resistance of about
110 degrees Celsius.
The
second type is polyvinylidene chloride (PVDC), which is mainly used for
the packaging of some cooked foods, meat products, raw fish and other
products. It can be used for refrigerator fresh-keeping or microwave
ovens. It is resistant to heat (resistant to 140 degrees Celsius). ).
The
third type is polyvinyl chloride, referred to as PVC. The plastic wrap
of this material contains a plasticizer, which is harmful to the human
body and is not allowed to be used in meat. At
present, the plastic wrap is not seen in the regular track
supermarkets, but because of the low price, some people in the wholesale
market and other areas with poor control, there will be people.
PVC
cling film itself contains a certain amount of vinyl chloride monomer,
vinyl chloride monomer will melt into the food when it is hot or oil,
although the PVC content of most PVC cling film on the market is lower
than the highest specification, but It
is difficult for this chemical substance to be completely excreted from
the body. When the residual amount of vinyl chloride in the human body
is excessive, the human health will be severely damaged.
In
addition, PVC cling film must participate in plasticizers (ie,
plasticizers) during consumption to make the cling film thinner and more
transparent. Plasticizers
containing plasticizers are easily released when exposed to oil or high
temperatures (beyond 100 degrees Celsius). When food enters the body,
it may cause male endocrine disorders and reproductive decline. Children are more vulnerable than adults.