What kind of plastic wrap is required for cling film packaging machine?
Number of views: 927 Release date: 2018/11/10 8:54:04
For
those who use the refrigerator regularly, we will know that it is a
kind of packaging product that we often use. It will also be seen on the
packaging fruit. For example, our plastic wrap packaging machine is the
same, then wrap packaging What kind of plastic wrap should I choose?
When
purchasing a crisper or cling film first, be sure to pay attention to
whether it can be marked with a detailed title or chemical structure. If
there is only an English name and no Chinese logo, products should be
carefully purchased. At the same time, be sure to choose the product labeled "Food".
The
fresh box mainly consists of polyethylene (PE) and polypropylene (PP).
The price difference between the two products is not large, but
polypropylene (PP) can better prevent the penetration of grease.
When
purchasing plastic wrap, it is first recommended to purchase
self-adhesive wrap film made of polyethylene (PE) material, especially
when it is used to stop the preservation of meat, fruits, etc., because
of the safety, PE cling film is the safest. . If
you want a longer shelf life, you are encouraged to choose
polyvinylidene chloride (PVDC). Because of the better moisturizing
properties of the plastic wrap of this material, the shelf life of the
cling film of the three materials is the longest. Polyvinyl
chloride (PVC) cling film has good transparency, good viscosity, good
elasticity and low price, so it has become the choice of many people,
but we must pay attention to the preservation of fat foods, because it
is made of poly A resin composed of a vinyl chloride resin, a plasticizer and an antioxidant is not toxic by itself. However,
the main auxiliary materials such as plasticizers and anti-aging agents
are added. The plasticizers in daily-use polyvinyl chloride plastics
mainly use dibutyl terephthalate and dioctyl phthalate. These chemicals It
is toxic, and the oil in the food can easily dissolve the plasticizer
"ethyl ammonia" in the plastic wrap, which has a great destructive
effect on the human endocrine system and can disturb the hormone
metabolism of the human body. There is also a polyvinyl chloride anti-aging agent lead stearate salt which is also toxic. Lead-salt-containing polyvinyl chloride (PVC) products in contact with ethanol, ether and other solvents will precipitate lead. When
the lead-containing polyvinyl chloride is used as a food package and
meets fritters, fried cakes, fried fish, cooked meat products, and cake
snack foods, the lead molecules will diffuse into the oil, so the PVC
plastic bags cannot be used. Contains oily foods. In addition, it should not be heated in a microwave oven and should not be used at high temperatures Since
polyvinyl chloride plastic products gradually synthesize hydrogen
chloride gas at a relatively high temperature, such as about 50 ° C,
this gas is harmful to the human body, and thus polyvinyl chloride
products are not suitable as food packaging.