A kind of polyolefin film, its preparation method and the photosensitive material cover film comprising the same
A technology of photosensitive materials and polyolefins, applied in the field of plastic packaging films, can solve the problems of loss of light-shielding and moisture-proof functions, difficulty, etc., and achieve the effect of convenient operation and improved utilization rate
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Embodiment 1
[0046] A polyolefin film, such as figure 1 As shown, it includes a first outer layer 11, an intermediate layer 12 and a second outer layer 13 stacked in sequence;
[0047] Wherein, the middle layer 12 is composed of 60wt% rebonable polyolefin and 40wt% low-density polyethylene, with a thickness of 10 μm;
[0048] Both the first outer layer 11 and the second outer layer 13 are composed of 50wt% linear low density polyethylene, 40wt% low density polyethylene and 10wt% black masterbatch, and both have a thickness of 10 μm.
[0049] The preparation method of above-mentioned polyolefin film is as follows:
[0050] According to the formula, the components of the first outer layer 11, the middle layer 12 and the second outer layer 13 are melt-extruded through three channels of a three-layer co-extrusion blow molding machine, and the components of the middle layer 12 are extruded through the middle channel , setting the thickness of each layer, and blow molding to form the above pol...
Embodiment 2
[0054] A polyolefin film comprising a first outer layer, an intermediate layer and a second outer layer laminated in sequence;
[0055] Among them, the middle layer is rebondable polyolefin with a thickness of 40 μm;
[0056] Both the first outer layer and the second outer layer are composed of 75wt% linear low-density polyethylene, 20wt% low-density polyethylene and 5wt% black masterbatch, and both have a thickness of 40 μm.
[0057] The preparation method of above-mentioned polyolefin film is as follows:
[0058] According to the formula, the components of the first outer layer, the middle layer and the second outer layer are respectively melt-extruded through three channels of a three-layer co-extrusion blow molding machine, and the components of the middle layer are extruded through the middle channel, and each set layer thickness, blown to form the above polyolefin film;
[0059] The temperature in each channel is: the first outer layer is 190°C, the middle layer is 170...
Embodiment 3
[0062] A polyolefin film comprising a first outer layer, an intermediate layer and a second outer layer laminated in sequence;
[0063] Wherein, the middle layer is composed of 80wt% rebonable polyolefin and 20wt% low-density polyethylene, with a thickness of 30 μm;
[0064] Both the first outer layer and the second outer layer are composed of 60wt% linear low-density polyethylene, 20wt% low-density polyethylene and 20wt% black masterbatch, and both have a thickness of 10 μm.
[0065] The preparation method of above-mentioned polyolefin film is as follows:
[0066] According to the formula, the components of the first outer layer, the middle layer and the second outer layer are respectively melt-extruded through three channels of a three-layer co-extrusion blow molding machine, and the components of the middle layer are extruded through the middle channel, and each set layer thickness, blown to form the above polyolefin film;
[0067] The temperature in each channel is: the ...
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Abstract
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