Cast breathable film for hygienic products and preparation method of cast breathable film
A technology of hygienic products and breathable film, which is applied in the field of casting breathable film and its preparation, which can solve the problems of large air flow, affecting the comfort of sanitary products, and low air flow of breathable film, so as to achieve the effect of improving comfort
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[0027] The preparation method of the casting air-permeable film that above-mentioned hygiene product is used, described method comprises the following steps:
[0028] Prepare low air permeability masterbatch and high air permeability masterbatch;
[0029] The low air flow masterbatch and the high air flow masterbatch are simultaneously extruded through different screw extruders through a die. Such as Figure 7 As shown, it includes three screw extruders, the left and right screw extruders are loaded with low air flow masterbatch, while the middle screw extruder is loaded with high air flow masterbatch; the three screws The extruders are all extruded into films through a die; this method can make figure 1 The embodiment shown, increasing the number of screw extruders can also be made figure 2 Example shown. Now with figure 1 The illustrated embodiment is described as an example. make figure 1 In the example shown, three screw extruders with the same die are used for ext...
example 1
[0042] Example 1: Place the cast air-permeable film in the front stretching roller, the rear stretching roller and the winding roller for stretching, wherein the speed of the stretching roller is increased in the pulsation, for example, repeated in 0.1 seconds-0.5 seconds Increase the speed of the rear stretching roller to 1.1-1.3 times that of the front stretching roller; this is equivalent to stretching the cast air-permeable film section between the front stretching roller and the rear stretching roller in a short period of time The force is increased, so that the air flow rate of the cast air permeable membrane segment is increased relative to that of the unaccelerated segment. thus forming something like Figure 5 The air permeable membrane, even if the low air flow area 2 and the high air flow area 1 appear alternately. In this way, the predetermined cast air permeable film can be achieved by adjusting the interval between the front stretching roller and the rear stretc...
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