Foamed polyolefin resin sheet
A polyolefin resin and foamed sheet technology, applied in synthetic resin layered products, layered products, chemical instruments and methods, etc., can solve the problems of weak rigidity, insufficient rigidity, and reduced loading efficiency, and achieve bending High elastic modulus, improved visibility, and excellent operability
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Embodiment 1、2
[0118] Embodiment 1, 2, comparative example 1
[0119] As an extruder for polyolefin resin foam sheet formation, a tandem extruder consisting of a first extruder with a screw diameter of 90 mm and a second extruder with a screw diameter of 120 mm was used, and the second extrusion The outlet of the machine is equipped with a ring-shaped die with a lip diameter of 175 mm. Furthermore, in Examples 1 and 2, an annular die having a parallel mold clamping flat surface (part with the same interval between resin flow paths) with a length of 2 mm at the front end of resin extrusion was used, and in Comparative Example 1, no This is a conventional annular die in which the gap between the resin flow paths of the parallel clamping flat surface and the resin extrusion tip portion is gradually narrowed.
[0120] The polyolefin resin of the type and amount shown in Table 2 and the masterbatch of the foam regulator (foam regulator masterbatch) shown in Table 2 were supplied to the raw mater...
Embodiment 3~7、 comparative example 2~6
[0123] As an extruder for polyolefin resin foam sheet formation, a tandem extruder consisting of a first extruder with a screw diameter of 90 mm and a second extruder with a screw diameter of 120 mm was used as a polyolefin resin layer formation As an extruder, a third extruder having a screw diameter of 50 mm and L / D=50 was used. Furthermore, a ring die for coextrusion is connected to each outlet of the second extruder and the third extruder, and each molten resin can be laminated in the ring die.
[0124] The polyolefin resin of the type and amount shown in Table 2 and the masterbatch of the bubble regulator of the amount shown in Table 2 are supplied to the raw material inlet of the first extruder of the series extruder, heated and kneaded, and the formation is adjusted to about 200 ℃ molten resin mixture. Then, in this molten resin mixture, press the physical blowing agent of the amount shown in Table 2, then supply in the second extruder that is connected to the downstre...
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