Method of manufacturing soundproof sheet and soundproof sheet
AssigneeSeiko Epson Corporation
InventorsHideaki Yajima, Yuta Okawa
Life of this patent
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Abstract
A method of manufacturing a soundproof sheet includes a first accumulating step of producing a web in which a plurality of first fibers, which are natural fibers, and a plurality of second fibers including a first core portion and a first coating layer coating the first core portion and having a first melting point are mixed, a heating step of heating the web to melt the first coating layer, a pressurizing step of applying a predetermined compressive force to the web in a state where the first coating layer is melted, and a pressurized cooling step of cooling the web to solidify the first coating layer while still applying the predetermined compressive force.
Claims8
A method of manufacturing a soundproof sheet comprising:
- a first accumulating step of producing a first accumulated fiber body in which a plurality of first fibers, which are natural fibers, and a plurality of second fibers including a first core portion and a first coating layer coating the first core portion and having a first melting point are mixed;
- a second accumulating step of producing a second accumulated fiber body in which a plurality of first fibers and a plurality of third fibers including a second core portion and a second coating layer coating the second core portion and having a second melting point higher than the first melting point are mixed;
- a heating step of stacking and heating the first accumulated fiber body and the second accumulated fiber body to melt the first coating layer and the second coating layer;
- a cooling step of cooling the stacked first accumulated fiber body and second accumulated fiber body to a temperature equal to or higher than the first melting point and lower than the second melting point to solidify the second coating layer without solidifying the first coating layer;
- a pressurizing step of applying a predetermined compressive force to the stacked first accumulated fiber body and second accumulated fiber body in which the second coating layer is solidified;
- and
- a pressurized cooling step of cooling the first accumulated fiber body and the second accumulated fiber body to a temperature lower than the first melting point to solidify the first coating layer and the second coating layer, while still applying the predetermined compressive force.
A method of manufacturing a soundproof sheet comprising:
- a first accumulating step of producing a first accumulated fiber body in which a plurality of first fibers, which are natural fibers, and a plurality of second fibers including a first core portion and a first coating layer coating the first core portion and having a first melting point are mixed;
- a heating step of heating the first accumulated fiber body to melt the first coating layer;
- a pressurizing step of applying a predetermined compressive force to the first accumulated fiber body in a state where the first coating layer is melted;
- and
- a pressurized cooling step of cooling the first accumulated fiber body to solidify the first coating layer while still applying the predetermined compressive force, wherein
- in the pressurizing step, a compression ratio due to the predetermined compressive force is 10% or more,
- the pressurizing step is performed by using a pressurizing portion,
- the pressurizing portion includes a first pressurizing portion and a second pressurizing portion,
- the compressive force is applied between the first pressurizing portion and the second pressurizing portion,
- the pressurized cooling step is performed using a pressurized cooling portion,
- the pressurized cooling portion includes a first pressurized cooling portion and a second pressurized cooling portion, and
- application of the compressive force and cooling are performed between the first pressurized cooling portion and the second pressurized cooling portion.
Dependencies are inferred from the claim text.