SMC manufacturing method
US12179388B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 14, 2022 |
| Grant date | Dec 31, 2024 |
| Priority date | — |
| Expiry date | Dec 27, 2042 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2701/314
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Provided is a useful improvement in a manufacturing method of a CF-SMC using a partially split continuous carbon fiber bundle. The manufacturing method of an SMC of the present invention includes (i) a step of drawing out a continuous carbon fiber bundle (10) from a package, the continuous carbon fiber bundle (10) having a filament number of NK and partially split into n sub-bundles in advance, (ii) a step of chopping the continuous carbon fiber bundle (10) drawn out from the package with a rotary cutter (234) into chopped carbon fiber bundles (20), and (iii) a step of depositing the chopped carbon fiber bundles (20) on a carrier film (41) traveling below the rotary cutter (234) to form a carbon fiber mat (30). In the manufacturing method, due to a fragmentation processing, in which at least some of the chopped carbon fiber bundles before being deposited on the carrier film (41) are fragmented by being brought into contact with a rotating body, a distribution of the filament number of the chopped carbon fiber bundles in the carbon fiber mat (30) is made different from that when the fragmentation processing is not performed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.