# US 12,759,082 B2 · Sealing method

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- Number: US 12,759,082 B2
- Document ID: US12759082B2
- Status: Granted
- Kind: B2
- Application number: 18/161,432
- Filed: 2023-01-30
- Published: 2023-06-01
- Granted: 2026-10-13
- Earliest claimed: 2016-12-12
- Assignees: Daicel Miraizu Ltd.
- Applicants: Daicel Miraizu Ltd.
- Inventors: Masahiko Itakura; Masahiro Katayama; Takayuki Uno
- Web page: https://patentgrep.com/patent/US12759082B2

## CPC

- B23K 26/352: for surface treatment
- B29C 45/14: incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles {(B29C45/1671 takes precedence)}
- B29C 45/14311: {using means for bonding the coating to the articles (B29C45/14795 takes precedence)}
- B29C 45/14467: {Joining articles or parts of a single article (B29C45/14377, B29C45/14385, B29C45/14581, B29C45/14614 and B29C45/006 take precedence)}
- B29C 45/14491: {Injecting material between coaxial articles, e.g. between a core and an outside sleeve for making a roll}
- B29C 65/70: by moulding (using a particular moulding technique, see the relevant technique {, e.g. by injection B29C45/14467})
- F16L 47/24: for joints between metal and plastics pipes
- B29C 2045/1454: {injecting between inserts not being in contact with each other}
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL

## Abstract

A sealing method for sealing an opening of a metallic molded body with a resin molded body, the metallic molded body having a cavity therein and an opening connected to the cavity, includes a step of irradiating laser light onto a joining surface on a periphery of the opening of the metallic molded body in an energy density of 1 MW/cm2 or more and at an irradiation rate of 2000 mm/sec or more to roughen the surface, and a step of placing, in a mold, a portion including the joining surface of the metallic molded body roughened in the preceding step and sealing the opening with a resin molded body formed by injection molding or compression molding of a resin.

## Claims

### Claim 1

A composite molded body comprising:
a metallic molded body and a resin molded body sealing the metallic molded body;
the metallic molded body having a cavity therein;
the metallic molded body having at least one opening through a joining surface with the resin molded body, the at least one opening through the joining surface is directly connected to the cavity;
the joining surface of the metallic molded body with the resin molded body is roughened at a periphery of the at least one opening, the roughened joining surface at the periphery of the at least one opening of the metallic molded body having a porous structure in which holes are formed in a range of an average depth from 10 to 70 μm; and
with the resin having been solidified in a state of entering into an interior of the porous structure formed in the joining surface at the periphery of the at least one opening of the metallic molded body, the at least one opening of the metallic molded body is sealed with the resin molded body in the composite molded body.

### Claim 2 (depends on 1)

The composite molded body according to claim 1, wherein the metallic molded body is a tubular metallic molded body having a first end surface and a second end surface opposite the first end surface, the cavity is a through hole having a first opening on a side of the first end surface and a second opening on a side of the second end surface, the joining surface is an annular joining surface surrounding the first opening on the first end surface, and the first opening is sealed with the resin molded body.

### Claim 3 (depends on 1)

The composite molded body according to claim 1, wherein the metallic molded body has a top surface, a bottom surface opposite the top surface, and side surfaces, the cavity is an internal hollow part, the opening is formed in the top surface and connected to the internal hollow part, the joining surface is an annular joining surface surrounding the opening, and the opening is sealed with the resin molded body.