The increase in take out food has greatly increased the use of disposable tableware. At present, the market is mainly focused on plastic lunch boxes, although some high-end restaurants will use tin foil and boxes. Whether disposable tableware is harmful or not can not be generalized for the time being. It depends on the material of disposable tableware and the state of the food to be grasped.
Because disposable tableware is mainly made of plastic lunch box, it will do harm to health. Most of the boxes in the restaurant are made of polypropylene (PP), which can be used for cooking.
The national standard for plastics used in contact with food is GB 4806.7-2016 plastic materials and products used in contact with food. The specified physical and chemical indexes are as follows:
1. total migration
In contact with plastic for food, there may be a variety of harmful substances (mainly plasticizers, antioxidants, stabilizers, etc.) migrating to food. This project is to use a variety of food simulated immersion solution to evaporate and dry, so as to transfer the total amount of volatile matter soaked in the sample.
2. Consumption of potassium permanganate
The consumption test of potassium permanganate is to immerse the sample in distilled water, and all organic small molecules can be easily dissolved in water to form a mixture. The mixture was titrated with highly oxidized potassium permanganate solution, in which all the small organic molecules were oxidized, while water did not participate in the chemical reaction.
3. heavy metals
Plastics in contact with food may contain heavy metals, mainly from heat stabilizers, colorants or some inferior materials. This project measures the content of heavy metals in plastics.
Data show that under normal use environment, harmful substances in plastic will not migrate to food. From the test results, this material PP (polypropylene) is indeed relatively safe. Not only that, plastic boxes can also be heated in microwave ovens. And polystyrene (PS), polymerized from styrene, is usually used in instant noodle boxes and fast food boxes. Heat and cold resistance, but too high temperature will release harmful substances, so do not put the bowl of instant noodles into the microwave oven for heating, do not use it to fill the hot food, and do not contain strong acid (if juice) and strong alkaline substances, otherwise it will release some harmful substances, or not very good.
Although disposable tableware brings many conveniences to life, it also makes the natural environment relatively expensive. Plastic tableware and other tableware are not easy to corrupt for a long time. If as a waste incineration plant, in addition to increasing garbage, it also leads to air pollution problems. People may prevent the drainage ditch or kill animals to eat and harmful organisms.
The safety of disposable tableware has been questioned. In the manufacturing process of some plastic products, in order to make the plastic colorful appearance or make the plastic more stable, plasticizers will be added, dyes containing heavy metals and stabilizers, and flame retardants, such as chemicals, high temperature or fat, may release harmful substances. The hot food in the box will smell, release harmful substances, and some will overheat and deform, which is not good enough for use or not.
Because disposable plastic tableware is discarded after use, it often causes waste of resources and increases the cost of garbage disposal. A large number of plastic waste increases the burden of environmental self-healing. It is hoped that the concept of "Zero plastic" environmental protection tableware can make a contribution to the earth's environment in practice.
With more and more attention to the concept of environmental protection, fast degradation of tableware will become the mainstream in the future. I believe that disposable food boxes will become more and more environmentally friendly and healthy.
The above is a detailed introduction to the harm of corn starch granules to disposable tableware. For more information, please click http://www.rsoau.com