Is there any harmful substance in the stretched film
Source：Is there any harmful substance in the stretched filmTime：2019-09-27Visitors：
The stretched film was originally made of EVA as a self-adhesive material, but its cost is high and taste. After development, PIB and VLDPE are self-adhesive materials. The substrate is now dominated by LLDPE, including C4, C6, C8 and metallocene. PE (MPE). So how do we distinguish which materials of stretch film can be used to package food? The following is a detailed analysis by the stretch film manufacturer:
First, cut the sample, clamp it with tweezers, and extinguish it on the extinguished alcohol lamp (if the alcohol-free lamp can be replaced with a extinguished candle (use one substance instead of another (mostly the strong replaces the weak). Then, look at the difficulty of extinction, the situation after the fire, the flame and the color of the smoke, the scene of the extinction and the breath of the recovery. The comprehensive discrimination can be used to know what kind of plastic (structure: synthetic resin, plasticizer, stabilizer, colorant) The LLDPE stretch film in the early stage of stretch film is developed by blowing film, from single layer to second layer and third layer; LLDPE stretch film is mainly produced by casting method.
First, polypropylene plastic (structure: synthetic resin, plasticizer, stabilizer, colorant): flammable, fire after ignition, flame and smoke color is orange-yellow, there is no liquid under the burning, there is oil breath.
Second, polyethylene plastic (structure: synthetic resin, plasticizer, stabilizer, colorant): flammable, off-fire subsequent combustion, flame and smoke, the bottom of the blue, yellow, burning, there is a drop of molten material, recovery Paraffin breath.
Third, polyvinyl chloride (chemical formula C2H3Cl) plastic (structure: synthetic resin, plasticizer, stabilizer, colorant): non-flammable, away from fire, the flame and smoke are green at the bottom, the tip is yellow, After the fire is extinguished, there is a soothing taste of hydrochloric acid gas.
Through the above method, the residual problem of the harmful substances of the wound film can be quickly detected, and the food which needs to be cleaned can be packaged for vegetables, fruits, etc., but the direct food (food) such as bread and cooked food cannot be directly packaged. In the early stage of stretch film wholesale LLDPE stretch film is more than blown film, from single layer to two or three layers; LLDPE stretch film is mainly produced by casting method.
First, cut the sample, clamp it with tweezers, and extinguish it on the extinguished alcohol lamp (if the alcohol-free lamp can be replaced with a extinguished candle (use one substance instead of another (mostly the strong replaces the weak). Then, look at the difficulty of extinction, the situation after the fire, the flame and the color of the smoke, the scene of the extinction and the breath of the recovery. The comprehensive discrimination can be used to know what kind of plastic (structure: synthetic resin, plasticizer, stabilizer, colorant) The LLDPE stretch film in the early stage of stretch film is developed by blowing film, from single layer to second layer and third layer; LLDPE stretch film is mainly produced by casting method.
First, polypropylene plastic (structure: synthetic resin, plasticizer, stabilizer, colorant): flammable, fire after ignition, flame and smoke color is orange-yellow, there is no liquid under the burning, there is oil breath.
Second, polyethylene plastic (structure: synthetic resin, plasticizer, stabilizer, colorant): flammable, off-fire subsequent combustion, flame and smoke, the bottom of the blue, yellow, burning, there is a drop of molten material, recovery Paraffin breath.
Third, polyvinyl chloride (chemical formula C2H3Cl) plastic (structure: synthetic resin, plasticizer, stabilizer, colorant): non-flammable, away from fire, the flame and smoke are green at the bottom, the tip is yellow, After the fire is extinguished, there is a soothing taste of hydrochloric acid gas.
Through the above method, the residual problem of the harmful substances of the wound film can be quickly detected, and the food which needs to be cleaned can be packaged for vegetables, fruits, etc., but the direct food (food) such as bread and cooked food cannot be directly packaged. In the early stage of stretch film wholesale LLDPE stretch film is more than blown film, from single layer to two or three layers; LLDPE stretch film is mainly produced by casting method.
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