Method of cutting thin slices and suppressing scratches

Abstract

The present invention provides a cut sheet having sufficient water resistance and few sharp protrusions on the end surface and a method of suppressing scratches despite containing a large amount of inorganic particles. The cut sheet is a cut sheet formed from a resin composition containing 50% by mass or more of inorganic particles and a thermoplastic resin relative to the mass of the entire composition, and the cut sheet is measured in accordance with JIS K-7209 The water absorption rate is 10% or less, and the occupancy of the actual exposed area of ​​the inorganic particles on at least one end surface is lower than the theoretical area occupancy of the inorganic particles by more than 2%.

Description

technical field

[0001] The invention relates to a method for cutting thin slices and suppressing scratches. Background technique

[0002] Conventionally, sheets using thermoplastic resins have been used in various applications, but due to the hydrophobicity of thermoplastic resins themselves, water resistance is hardly a problem. However, mixing inorganic particles and stretching them will greatly increase the water absorption of the sheet.

[0003] Therefore, when adding inorganic particles to a thermoplastic resin and stretching them to improve whiteness and opacity, it is necessary to suppress an increase in water absorption.

[0004] For example, Patent Document 1 discloses a film material for processing containing a thermoplastic resin and an inorganic substance powder at a weight ratio of 18:82 to 50:50, and describes that the film material is stretched at about 1.2 to 4.0 times, By stretching so that the specific gravity becomes 1.4 or less and 0.6 or more, water ab...

Examples

Embodiment 1

[0074] Utilize a biaxial kneading extruder to make the polypropylene resin containing 40% by mass (density 0.91 [g / cm 3 ]), heavy calcium carbonate (average particle diameter 5 μ m) 60 mass % main component, and the resin composition (the content of calcium carbonate in the resin composition is 0.5 mass % antistatic agent added with respect to main component 59.7% by mass, polypropylene resin 39.8% by mass) and then stretched 1.5 times with a longitudinal stretcher to produce a sheet, which was then cut with a desktop cutter.

Embodiment 2

[0076] The polyurethane resin was coated on the front and back of the sheet produced in Example 1 with a micro gravure coater, and cut with a table cutter.

Embodiment 3

[0078] The acrylic resin was coated on the front and back of the sheet produced in Example 1 with a micro gravure coater, and cut with a table cutter.

[0079] [Evaluation 1]

[0080] The physical properties (density, basis weight, thickness, breaking point strength, breaking point elongation, tear strength, gloss, whiteness, opacity, water absorption) of the cut sheets produced by Examples 1 to 3 ) for evaluation. The results are shown in Table 1. Density conforms to JIS K7112, basis weight conforms to JIS P8124, thickness conforms to JIS K7130, breaking point strength and breaking point elongation conforms to JIS K7162, tear strength conforms to JIS K7128-3, glossiness conforms to JISP8142, and whiteness conforms to According to JIS P8148, opacity is a value measured according to JIS P8149. The water absorption rate is a value calculated by immersing in pure water for 24 hours according to JIS K7209, taking it out from the water, wiping off the water lightly with a cloth,...

technical field

[0001] The invention relates to a method for cutting thin slices and suppressing scratches. Background technique

[0002] Conventionally, sheets using thermoplastic resins have been used in various applications, but due to the hydrophobicity of thermoplastic resins themselves, water resistance is hardly a problem. However, mixing inorganic particles and stretching them will greatly increase the water absorption of the sheet.

[0003] Therefore, when adding inorganic particles to a thermoplastic resin and stretching them to improve whiteness and opacity, it is necessary to suppress an increase in water absorption.

[0004] For example, Patent Document 1 discloses a film material for processing containing a thermoplastic resin and an inorganic substance powder at a weight ratio of 18:82 to 50:50, and describes that the film material is stretched at about 1.2 to 4.0 times, By stretching so that the specific gravity becomes 1.4 or less and 0.6 or more, water ab...

Examples

Embodiment 1

[0074] Utilize a biaxial kneading extruder to make the polypropylene resin containing 40% by mass (density 0.91 [g / cm 3 ]), heavy calcium carbonate (average particle diameter 5 μ m) 60 mass % main component, and the resin composition (the content of calcium carbonate in the resin composition is 0.5 mass % antistatic agent added with respect to main component 59.7% by mass, polypropylene resin 39.8% by mass) and then stretched 1.5 times with a longitudinal stretcher to produce a sheet, which was then cut with a desktop cutter.

Embodiment 2

[0076] The polyurethane resin was coated on the front and back of the sheet produced in Example 1 with a micro gravure coater, and cut with a table cutter.

Embodiment 3

[0078] The acrylic resin was coated on the front and back of the sheet produced in Example 1 with a micro gravure coater, and cut with a table cutter.

[0079] [Evaluation 1]

[0080] The physical properties (density, basis weight, thickness, breaking point strength, breaking point elongation, tear strength, gloss, whiteness, opacity, water absorption) of the cut sheets produced by Examples 1 to 3 ) for evaluation. The results are shown in Table 1. Density conforms to JIS K7112, basis weight conforms to JIS P8124, thickness conforms to JIS K7130, breaking point strength and breaking point elongation conforms to JIS K7162, tear strength conforms to JIS K7128-3, glossiness conforms to JISP8142, and whiteness conforms to According to JIS P8148, opacity is a value measured according to JIS P8149. The water absorption rate is a value calculated by immersing in pure water for 24 hours according to JIS K7209, taking it out from the water, wiping off the water lightly with a cloth,...

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