How to identify whether plastic food packaging bags are toxic
How to identify whether plastic food bags are toxic? Dongguan packaging products Co., Ltd. specializing in the production of food packaging bags teaches you the following detection methods.
Sensory test method: non toxic plastic bags are milky white, translucent, or colorless and transparent, flexible, with a sense of lubrication when touching, and the surface seems to have wax; the color of toxic plastic bags is turbid or light yellow, and the handle is sticky.
Water detection method: put the plastic bag in the water and press it into the bottom of the water. The proportion of the non-toxic plastic bag is small, and it can float out of the water surface. The toxic plastic bag ratio is large and sinks.
Shaking detection method: hold one end of the plastic bag by hand and shake it hard, and the one with crisp sound is non-toxic; the one with dull sound is toxic.
Fire detection method: the non-toxic polyethylene plastic bag is inflammable, the flame is blue and the upper end is yellow. When burning, it drops like candle tears, with stone cured flavor and less smoke; the toxic PVC plastic bag is not flammable and extinguishes immediately after leaving the fire. The flame is yellow and the bottom is green. It can soften and draw silk and emit the irritating smell of hydrochloric acid.
Food bags not only require beautiful appearance, food packaging bags easy to carry, more importantly to improve the quality, to ensure food safety. This puts forward higher requirements on the performance of food packaging bag material, whether it is green or not, and the production design and production process of packaging.
Now we use plastic food bags, mainly including polyester, polyethylene, polypropylene, polystyrene, polyvinyl chloride, etc. among them, polyethylene and polypropylene are safe plastics, which can be used to hold food. Most PVC bags are toxic and can't package food. Because the unpolymerized vinyl chloride in PVC resin is toxic to human body. Moreover, in the process of PVC resin processing into plastic bags, some plasticizers, pigments and other toxic auxiliary materials should be added. The main component of plastic stabilizer is lead stearate, which is also toxic. This kind of lead salt is very easy to separate out, once it enters the human body, it will cause accumulated lead poisoning.
Packaging material knowledge: film with static electricity on the opposite side of flexible packaging printing
The printing surface of the film can be touched at the winding position to check whether the film has static electricity. If the film with static electricity, it is necessary to check the ground wire of the printing machine to ensure that the ground wire is connected, so as to avoid the transfer of ink due to the influence of static electricity, resulting in adhesion on the opposite side of the printed matter. http://www.dgbpk.com/
Dongguan Beite packaging materials Co., Ltd
Dongguan special bag, plastic bag, plastic bag, plastic bag