Cellophane properties
DATE：2019/9/16 8:49:28 / READ： / SOURCE：This station
Cellophane properties
An aqueous solution softener such as 2% to 18% of glycerin or ethylene glycol is added to the cellophane to prevent brittleness during drying or at low temperatures. The content is different in summer and winter, which means that it is most suitable for 3 months from the date of manufacture. The physics of cellophane: the mechanical properties vary with the softener content. The content of the softener increases, the elongation increases, and the tensile strength decreases. It is determined by experience to add an appropriate amount. Changes in the environment and humidity have a large impact on it. It can be seen that the cell paper has high dependence on temperature, the temperature rises, the elongation increases, becomes soft, and the tensile strength decreases. The point of intersection is 40% to 50% humidity, which is the most suitable for use. condition.
The cellophane having a large amount of softener has a large elongation and tear strength, and the tensile strength is slightly small, and the cellophane having less softener has good machinability, but is relatively fragile. In general, cellophane with less softener is suitable for lap packaging, lightweight packaging or summer use. Cellulite with a lot of softeners is suitable for kinky packaging, high quality packaging or winter use. Table 4-4-3 shows the relationship between humidity and oxygen transmission rate of cellophane. As the humidity increases, the cellophane absorbs moisture, and the rate of oxygen permeation increases, and oxygen can pass through at a faster rate. Oxygen is the cause of food corrosion, so it is necessary to block oxygen. Moisture-proof cellophane, especially PVDC-coated cellophane, has good barrier properties, but for the surface of the film, the cross-section of the film is exposed to cellophane, and there is still a gap in actual data.
The comparison of the odor transmission rates of various cellophane and polyethylene and polyvinyl chloride films is shown in Table 444. Cellophane has good oil resistance. Table 4-4-5 is the oil resistance of moisture-proof cellophane. It can be used alone or in combination, in addition to packaging suitable for grease products, especially for the packaging of goods with high protective requirements.
The moisture-proof cellophane has good printability, processability and composite suitability. In addition, it also has the advantages of moisture resistance, thermal adhesion, non-chargeability, etc., but also has the disadvantage of fire resistance and poor dimensional stability. For this reason, it is composited with a plastic film other than polyethylene or polyethylene like the conventional cellophane, and is widely used in the field of packaging.
An aqueous solution softener such as 2% to 18% of glycerin or ethylene glycol is added to the cellophane to prevent brittleness during drying or at low temperatures. The content is different in summer and winter, which means that it is most suitable for 3 months from the date of manufacture. The physics of cellophane: the mechanical properties vary with the softener content. The content of the softener increases, the elongation increases, and the tensile strength decreases. It is determined by experience to add an appropriate amount. Changes in the environment and humidity have a large impact on it. It can be seen that the cell paper has high dependence on temperature, the temperature rises, the elongation increases, becomes soft, and the tensile strength decreases. The point of intersection is 40% to 50% humidity, which is the most suitable for use. condition.
The cellophane having a large amount of softener has a large elongation and tear strength, and the tensile strength is slightly small, and the cellophane having less softener has good machinability, but is relatively fragile. In general, cellophane with less softener is suitable for lap packaging, lightweight packaging or summer use. Cellulite with a lot of softeners is suitable for kinky packaging, high quality packaging or winter use. Table 4-4-3 shows the relationship between humidity and oxygen transmission rate of cellophane. As the humidity increases, the cellophane absorbs moisture, and the rate of oxygen permeation increases, and oxygen can pass through at a faster rate. Oxygen is the cause of food corrosion, so it is necessary to block oxygen. Moisture-proof cellophane, especially PVDC-coated cellophane, has good barrier properties, but for the surface of the film, the cross-section of the film is exposed to cellophane, and there is still a gap in actual data.
The comparison of the odor transmission rates of various cellophane and polyethylene and polyvinyl chloride films is shown in Table 444. Cellophane has good oil resistance. Table 4-4-5 is the oil resistance of moisture-proof cellophane. It can be used alone or in combination, in addition to packaging suitable for grease products, especially for the packaging of goods with high protective requirements.
The moisture-proof cellophane has good printability, processability and composite suitability. In addition, it also has the advantages of moisture resistance, thermal adhesion, non-chargeability, etc., but also has the disadvantage of fire resistance and poor dimensional stability. For this reason, it is composited with a plastic film other than polyethylene or polyethylene like the conventional cellophane, and is widely used in the field of packaging.
Author：admin