Screen
A projection screen and film layer technology, applied in the field of projection screens, can solve problems such as inconvenient viewing angles and high equipment prices
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manufacture example 1
[0083] At 250°C, after melting and mixing 87% by weight of propylene homopolymer (PP2), 10% by weight of high-density polyethylene (HDPE), and 3% by weight of calcium carbonate with an extruder, feed to the temperature setting It was extruded into a film at a temperature of 250° C., and cooled with a cooling roll to obtain an unstretched film. This unstretched film was stretched in the longitudinal direction at a four-fold ratio by heating at 135°C to obtain a uniaxially stretched film. This thin film is used as the base material layer (b).
[0084] At 250°C, with another extruder, a mixture of 52% by weight of propylene homopolymer (PP1), 3% by weight of high-density polyethylene (HDPE), and 45% by weight of calcium carbonate was melt-mixed and refined , fed to a die set at a temperature of 250°C, extruded into a film, laminated as the surface layer (a) and inner layer (c) on both sides of the above-mentioned four-fold stretched film, after cooling to 60°C , to obtain a thr...
manufacture example 2
[0087] With the mixture that is formed by the PP2 of 87% by weight, the HDPE of 10% by weight, and the calcium carbonate of 3% by weight as base material layer (b), with the HDPE by the 52% by weight of PP1, 3% by weight and 45% by weight % of calcium carbonate as the surface layer (a) and inner layer (c), after melting and mixing with different extruders at 250°C, they are fed to a co-extrusion die set at 250°C In the mold, the laminate obtained after lamination in the mold was extruded into a film, and cooled with a cooling roll to obtain an unstretched film. This unstretched film was stretched at a ratio of four times in the longitudinal direction by heating at 135° C. to obtain a uniaxially stretched film.
[0088] Next, this stretched film was heated to 164° C. and stretched at a ratio of nine times in the transverse direction by a tenter. Then, after heat treatment at 160° C., cooling to 60° C., and cutting off the edge, a multilayer stretched resin film layer with a th...
manufacture example 3
[0090] A multilayer stretched resin film layer having a thickness of 77 μm (a / b / c=18 μm / 41 μm / 18 μm) was prepared in the same manner as in Production Example 1 except that the extrusion amount of the resin was changed.
[0091] On the surface layer (a) side of the multilayer stretched resin film, an ink-jet coating agent having the following composition is coated on the surface layer (a) side of the multilayer stretched resin film according to the amount to form a coating layer having a thickness of 40 μm after drying, and allowed to dry, thereby Coating is set.
[0092] Silica fine particles (average particle diameter: 0.3 μm) (solid content ratio: 18%) 76% by weight
[0093] Polyvinyl alcohol (solid content ratio 10%) 20% by weight
[0094] Melamine formaldehyde resin (solid content ratio 30%) 2% by weight
[0095] Cationic acrylic polymer (30% solid content ratio) 2% by weight
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