Glass chopped strand mat, method for producing same, automotive molded ceiling material, and method for producing same
Provided is a high-quality and high-functionality glass chopped strand mat which is applicable to recent automotive molded ceiling materials which have excellent design and reduced weights. The glass chopped strand mat is a glass chopped strand mat (M) produced by forming glass chopped strands (S) into a sheet, in which the ratio of a tensile strength in a width direction to a tensile strength in a longitudinal direction (the width direction/the longitudinal direction) of the glass chopped strand mat (M) is at least 0.73 and less than 1.00, and the tensile strength in the width direction is not less than 80 N as measured in a tensile rupture test conducted according to the Japanese Industrial Standards (Section 7.25 of JIS R3420 (2006)), where the width of a test specimen is 150 mm.
1. A glass chopped strand mat produced by forming glass chopped strands into a sheet, wherein
the ratio of a tensile strength in a width direction to a tensile strength in a longitudinal direction (the width direction/the longitudinal direction) of the glass chopped strand mat is at least 0.73 and less than 1.00,
wherein the tensile strength in the width direction is 80 N to 154 N as measured in a tensile rupture test conducted according to the Japanese Industrial Standards (Section 7.25 of JIS R3420 (2006)), where width of a test specimen is 150 mm.
2. The glass chopped strand mat of claim 1 , wherein
the glass chopped strands have a weight of 50 to 150 g/m 2 , where the weight is the mass per unit area.
3. A method for producing an automotive molded ceiling material, comprising:
a layering step of putting the glass chopped strand mat of claim 1 on one or both sides of a flexible base sheet.
4. A method for producing an automotive molded ceiling material, comprising:
a layering step of putting the glass chopped strand mat of claim 2 on one or both sides of a flexible base sheet.
5. An automotive molded ceiling material including a glass chopped strand mat produced by forming glass chopped strands into a sheet, and a flexible base sheet on one or both sides of which the glass chopped strand mat is provided, wherein
the ratio of a tensile strength in a width direction to a tensile strength in a longitudinal direction (the width direction/the longitudinal direction) of the glass chopped strand mat is at least 0.73 and less than 1.00,
wherein the tensile strength in the width direction is 80 N to 154 N as measured in a tensile rupture test conducted according to the Japanese Industrial Standards (Section 7.25 of JIS R3420 (2006)), where width of a test specimen is 150 mm.