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Manufacturing apparatus and method of microporous polyolefin resin sheet
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A technology of polyolefin resin, manufacturing device, applied in the direction of flat products, applications, coatings, etc., which can solve the problems of contamination, dripping, flake defects, etc.
Active Publication Date: 2018-06-05
TORAY IND INC
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Abstract
Description
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Problems solved by technology
When the liquefied components accumulate to a certain amount, they will drip and contaminate the surface of the casting cooling device where the sheets are closely bonded, causing defects in the sheets.
Method used
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Embodiment 1
[0063] A specific sheet manufacturing method in this embodiment is as follows.
[0065] ·High-density polyethylene (HDPE), viscosity 1000Pa·s. Here, the viscosity is measured by the method of JIS K7117-2 on the condition of a shear rate of 100 / s and a temperature of 200 degreeC.
[0068] After the sheet material is dried, it is supplied to an extruder, and after passing through a gear pump and a filter, it is supplied to a sheet forming die. In addition, the temperature of the device before reaching the die was set to 230°C.
[0069] (3) Sheet forming die
[0070] Using a die with a slit width of 300 mm, the resin was discharged at a flow rate of 70 kg / hr.
[0071] It should be noted that the concentration of LP in the resin is 70% by mass, and 49kg / hr is LP. Also, depending on the sheet width and decompression degree, about 0.1% of the resin flow rate...
Embodiment 2
[0080] A specific sheet manufacturing method in this embodiment is as follows.
[0082] The same material as in Example 1 was used.
[0083] (2) Feeding
[0084] It carried out similarly to Example 1 except having set the temperature of the apparatus before reaching a die to 200 degreeC.
[0085] (3) Sheet forming die
[0086] Using a die with a slit width of 300 mm, the resin was discharged at a flow rate of 250 kg / hr. It should be noted that the concentration of LP in the resin is 70% by mass, and 175kg / hr is LP. Also, as described above, about 0.1% of LP in the resin flow rate volatilized from the sheet, and about 6.0 kg of LP volatilized per day was sucked into the decompression chamber together with the ambient air.
[0087] (4) Cast cooling device
[0088] Except having set the casting speed to 10 m / min, it carried out similarly to Example 1.
[0096] The same material as in Example 1 was used.
[0097] (2) Feeding
[0098] It carried out similarly to Example 1 except having set the temperature of the apparatus before reaching a die to 200 degreeC.
[0099] (3) Sheet forming die
[0100] A die with a slit width of 400mm was used. The above-mentioned resin was discharged from the die at a flow rate of 300 kg / hr. It should be noted that the concentration of LP in the resin is 70% by mass, and 210kg / hr is LP. Also, as described above, about 0.1% of LP in the resin flow rate volatilized from the sheet, and about 7.2 kg of LP volatilized per day was sucked into the decompression chamber together with the ambient air.
[0101] (4) Cast cooling device
[0102] Except having set the casting speed to 16 m / min, it carried out similarly to Example 1.
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Abstract
The present invention provides a method for producing a microporous polyolefin resin sheet, which can stably produce a sheet having a uniform crystallized structure even if the speed of the casting cooling device is increased by using a decompression chamber, and the obtained sheet has a Excellent thickness uniformity and excellent appearance quality. The manufacturing apparatus of the microporous polyolefin resin sheet of the present invention comprises: a die for extruding the molten resin into a sheet; The sheet is cooled and solidified at the same time; and a decompression chamber is arranged on the upstream side of the conveying direction of the casting cooling device closer to the die than the die, and is used to attract the sheet extruded from the die and the Air between the casting cooling devices; a rectifying plate is further provided, and the rectifying plate is provided so as to close the gap between the sheet discharged from the die and the casting surface. The decompression chamber is equipped with: a sealing material provided on at least the peripheral portion of the surface facing the casting cooling device, and in physical contact with the casting cooling device; The vicinities of the opposing openings are provided along the sheet width direction.
Description
technical field [0001] The present invention relates to a manufacturing device of a microporous polyolefin resin sheet and a manufacturing method using the manufacturing device. Background technique [0002] Next, an outline of a conventional sheet manufacturing apparatus will be described. Such as Image 6 As shown, in the conventional sheet manufacturing apparatus, the resin melted and kneaded by the extruder is extruded from the die 1 into a sheet shape, and then introduced into the casting cooling device 2 for cooling and solidification. At this time, in order to improve the formability of the sheet, by increasing the planarity of the sheet contact surface of the casting cooling device, a film having excellent surface properties can be produced (Patent Document 1). [0003] However, in order to cope with the increase in demand for resin sheets in recent years, it is necessary to increase the film forming speed. However, as the film production speed increases, the air f...
Claims
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Application Information
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