Label film and preparation method thereof
A label and film technology, applied in the field of film materials, can solve problems such as affecting the printing quality and easy generation of crystal points in the label film
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[0027] The invention provides a method for preparing a label film.
[0028] see figure 2 , in one embodiment of the present invention, the preparation method of label film, comprises the following steps:
[0029] S1, the film component is added to the hopper of the extrusion casting machine, and the film component is plasticized and melted in the barrel of the extrusion casting machine to form a melt;
[0030] S2, the melt is extruded from the die of the extrusion casting machine and cast to the gap between the cooling roll and the pressure roll of the extrusion casting machine, and the melt is formed into a film after being cooled and pressed material;
[0031] S3, the film material is pulled to the pulling roller, cooled and wound up, and processed into a label film.
[0032] In the technical scheme of the present invention, the film component is added to the hopper of the extrusion casting machine, and the film component is plasticized and melted in the barrel of the ex...
Embodiment 1
[0045] A method for preparing a label film, comprising the steps of:
[0046] First, the film component is subjected to dust removal treatment; then, the film component is put into the suction barrel of the extrusion casting machine, and the film component is transported to the hopper of the extrusion casting machine by vacuum negative pressure, and the film component is extruded The barrel of the casting machine is plasticized and melted to form a melt, and the melt reaches the die after being filtered by a filter; then, the melt is extruded from the die of the extrusion casting machine and cast to the extrusion stream In the gap between the cooling roller and the counter-pressing roller of the extension machine, the cooling roller is a high-gloss mirror-finished steel roller, the counter-pressing roller is a finely frosted silica gel roller with a surface roughness of 1000 mesh, and the extrusion speed of the die head is 30m / min , the temperature of the cooling roller and th...
Embodiment 2
[0053] On the basis of Example 1, in the embodiment of the present invention, the film component is composed of polyethylene and color masterbatch, polyethylene includes low-density polyethylene and high-density casting grade polyethylene, and low-density polyethylene accounts for the film component The mass fraction of low-density polyethylene is 25%, and the melt index of low-density polyethylene is 7g / 10min at a pressure of 2.16kg and a temperature of 190°C; high-density casting grade polyethylene accounts for 60% of the film component, and high-density casting The melt index of grade polyethylene at 2.16kg pressure and 190°C temperature is 27g / 10min; the mass fraction of color masterbatch in the film component is 15%, and the melt index of color masterbatch at 2.16kg pressure and 190°C is 3g / 10min. Among them, in the embodiment of the present invention, the extrusion speed of the die head is 35m / min, the temperature of the cooling roller and the pressure roller are both 23...
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Abstract
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