Film manufacturing method
A manufacturing method and film roll technology, applied in the field of film roll manufacturing, can solve problems such as poor coiling
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preparation example Construction
[0096] In a preparation section not shown, dope to be cast on the support body 22 is prepared.
[0097] (casting, drying, peeling process)
[0098] Next, the dope prepared in the preparation section is cast from the casting die 21 onto the support 22 . Then, the web 25 as a cast film formed by drying while being transported by the support body 22 is peeled off from the support body 22 . More specifically, as described below.
[0099] The dope prepared in the preparation section is sent to the casting die 21 through a pressurized quantitative gear pump, etc., using a conduit, and the flow on the support body 22 composed of a stainless steel endless belt is driven by rotation that is transferred infinitely. At the casting position, the dope is cast from the casting die 21, thereby forming a network 25 as a casting film on the support 22.
[0100] The support body 22 is held by a pair of drums 23·23 and a plurality of rollers (not shown) located between them. One or both of t...
Embodiment 1
[0154] (mastic composition)
[0155]
[0156]
[0157] The above-mentioned dope composition material was put into an airtight container, and it heated up until the liquid temperature became 80 degreeC, and stirred for 3 hours. In this way, a cellulose acetate propionate resin solution was obtained. Then, stirring was completed, and it was left to stand until the liquid temperature became 43 degreeC. Then, the obtained resin solution was filtered using a filter paper with a filtration accuracy of 0.005 mm, and the filtered resin solution was left overnight to defoam air bubbles in the resin solution. The resin solution thus obtained is used as a glue, using figure 2 In the production apparatus shown in , the dope was uniformly cast from a casting die on a stainless steel belt support body with a width of 2200 mm at a temperature of 35°C. It should be noted that, in the casting die, the interval in the width direction of the heat bolts was 12 mm.
[0158] Next, the so...
Embodiment 2～7、 comparative example 1～3
[0162] A film roll was produced in the same manner as in Example 1, except that the stretching ratio of the film and the offset amount A in the width direction of each layer of the film laminated by winding were changed as shown in Table 1. It should be noted that, in Examples 2 to 7, after calculating the pitch P of the protrusions in the width direction of the formed film, the offset A larger than the pitch P was set to carry out vibratory winding to produce film roll. Moreover, in Comparative Examples 1-3, the offset amount A smaller than the pitch P was set, vibration winding was performed, and the film roll was manufactured.
[0163]
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