Resin foamed sheet
A technology of foam sheet and resin, which is applied in the field of resin foam sheet, can solve the problem of not establishing the prevention of streaks, etc., and achieve the effect of simple quality and wide extrusion conditions
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Embodiment 1）
[0158] When making resin foam sheet, used with figure 2 The devices shown constitute an apparatus of the same kind.
[0159] That is, at two positions on the upstream side and the downstream side of the resin flow path W1 of the foamable resin composition flowing in from the first extruder 70, the non-foaming resin composition flows from the second extruder 80 through the branch pipe D. In the form of the foamable resin composition, the first and second extruders were connected to the confluence die XH, and the circular die CD was connected to the downstream side of the confluence die XH to perform co-extrusion.
[0160] First, as the first extruder for melt-mixing the forming material of the foamed resin layer, a single-screw extruder (upstream side extruder) with a diameter of 90 mm and a single-screw extruder connected to the single-screw extruder were prepared. A tandem extruder consisting of a single-screw extruder (downstream side extruder) with a caliber of 115 mm.
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Embodiment 2）
[0179] In the polypropylene-based resin composition for forming the surface layer, instead of the ethylene-α-olefin copolymer (KS240T) manufactured by Japan Polypropylene Corporation, crystallinity 50, sold under the trade name "LD400" by Japan Polypropylene Corporation, was used. % low-density polyethylene (PE) resin, except that, the resin foam sheet was produced in the same manner as in Example 1, and a foam tray was produced.
[0180] As a result of measuring the surface resistivity of the resin foam sheet of Example 2 in the same manner as in Example 1, it was 5.0×10 12 The surface resistivity of Ω / □.
[0181] In addition, no conspicuous streaks were observed, and the foamed tray formed from this foamed resin sheet had a beautiful appearance and was excellent in mechanical strength.
Embodiment 3）
[0183] In the polypropylene-based resin composition for forming the surface layer, instead of the ethylene-α-olefin copolymer (KS240T) manufactured by Japan Polypropylene Corporation, crystallinity 53, sold under the trade name "LF441B" by Japan Polypropylene Corporation, was used. % low-density polyethylene (PE) resin, except that, the resin foam sheet was produced in the same manner as in Example 1, and a foam tray was produced.
[0184] As a result of measuring the surface resistivity in the same manner as in Example 1 for the resin foam sheet of this Example 3, it was 6.5×10 12 The surface resistivity of Ω / □.
[0185] In addition, no conspicuous streaks were observed, and the foamed tray formed from this foamed resin sheet had a beautiful appearance and was excellent in mechanical strength.
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Abstract
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