Resin-bonding method

• US 5,123,989 A
• Filed: 06/11/1990
• Issued: 06/23/1992
• Est. Priority Date: 06/14/1989
• Status: Expired due to Fees

• Current Assignee: Dai-ichi High Frequency Co., Ltd., TODA Kogyo Corporation
• Original Assignee: Dai-ichi High Frequency Co., Ltd., TODA Kogyo Corporation
• Inventors: Terasaki, Masanori, Hirayama, Kotaro, Takaragi, Shigeru, Horiishi, Nanao, Toda, Tetsuro
• Primary Examiner(s): Simmons, David A.
• Assistant Examiner(s): Barry, Chester T.
• Application Number:
  US07/536,103
• Time in Patent Office: 743 Days
• Field of Search: 156/272.4, 156/272.2, 252/62.51, 252/62.54, 252/62.56, 219/10.41
• US Class Current: 156/272.4
• CPC Class Codes: B29C 65/3612 comprising fillers
• CPC Class Codes: B29C 65/3668 characterised by the means for supplying heat to said heated elements which remain in the join, e.g. special induction coils
• CPC Class Codes: B29C 65/3696 with a coating
• CPC Class Codes: B29C 65/4875 being spherical, e.g. particles or powders
• CPC Class Codes: B29C 65/4885 characterised by their composition being non-plastics
• CPC Class Codes: B29C 66/71 characterised by the composition of the plastics material of the parts to be joined welding bar compositions B29C65/125
• CPC Class Codes: B29C 66/721 Fibre-reinforced materials B29C66/729 takes precedence
• CPC Class Codes: B29C 66/91221 of the parts to be joined
• CPC Class Codes: B29C 66/91411 of the parts to be joined, e.g. the joining process taking the temperature of the parts to be joined into account
• CPC Class Codes: B29C 66/91431 the temperature being kept constant over time
• CPC Class Codes: B29C 66/91631 the heat or the thermal flux being kept constant over time
• CPC Class Codes: B29C 66/91651 by controlling or regulating the heat generated by Joule heating or induction heating
• CPC Class Codes: B29K 2023/04 Polymers of ethylene
• CPC Class Codes: B29K 2023/06 PE, i.e. polyethylene
• CPC Class Codes: B29K 2023/08 Copolymers of ethylene B29K2023/16 takes precedence
• CPC Class Codes: B29K 2023/10 Polymers of propylene
• CPC Class Codes: B29K 2023/12 PP, i.e. polypropylene
• CPC Class Codes: B29K 2023/14 Copolymers of polypropylene B29K2023/16 takes precedence
• CPC Class Codes: B29K 2025/04 Polymers of styrene
• CPC Class Codes: B29K 2025/06 PS, i.e. polystyrene
• CPC Class Codes: B29K 2025/08 : Copolymers of styrene, e.g. AS or SAN, i.e. acrylonitrile styrene B29K2055/02 takes precedence
• CPC Class Codes: B29K 2027/06 : PVC, i.e. polyvinylchloride
• CPC Class Codes: B29K 2061/04 : Phenoplasts
• CPC Class Codes: B29K 2063/00 : Use of EP, i.e. epoxy resins or derivatives thereof, as moulding material
• CPC Class Codes: B29K 2067/00 : Use of polyesters or derivatives thereof, as moulding material
• CPC Class Codes: B29K 2067/06 : Unsaturated polyesters
• CPC Class Codes: C08J 5/124 : using adhesives based on a macromolecular component

Abstract

Disclosed herein is a method for bonding a resin part, which comprises disposing a magnetic complex composed of a resin and magnetic particles as a heating-medium at the resin parts to be bonded, and applying an alternating magnetic field to the heating-medium by using a magnetic field generating means composed of an electromagnetic core and an exciting coil, thereby making said heating-medium generate heat for fuse-bonding said resins.

Claims

1. A method for bonding a resin part, said method comprising the steps of:

disposing as a heating-medium at said resin part a magnetic complex having a coercive force (Hc) of not less than 50 Oe, a maximum flux density (Bm) of not lower than 1,000 G and a residual flux density/coercive force (Br/Hc) ratio of not less than 1.3 and being composed of a resin and 0.1 to 90% by weight of magnetic particles which have a coercive force (Hc) of not less than 50 Oe and are selected from the group consisting of iron oxide particles, ferrite particles and a mixture thereof; and

applying an alternating magnetic field to said heating-medium with an intensity of 2 to 15 times the coercive force (Hc) of said heating-medium, by using a magnetic field generating means comprising a high-frequency power source and a heating-unit comprising an electromagnetic core and an exciting coil, in a frequency of 1 to 400 KHz, thereby causing said heating-medium to generate heat for fuse-bonding said resin part.

2. The method according to claim 1, wherein said magnetic particles have a coercive force (Hc) of more than 200 Oe and the content of said magnetic particles in said heating-medium is in the range of not less than 0.1% by weight and less than 50% by weight.

3. The method according to claim 1, wherein said magnetic particles have a coercive force (Hc) of 50-200 Oe and the content of said magnetic particles in said heating-medium is 50-90% by weight.

4. The method according to claim 1, wherein said resin is selected from the group consisting of polyethylene, polypropylene, polyvinyl chloride, polystyrene, ethylene copolymer, propylene copolymer, vinylchloride copolymer, styrene copolymer, melamine resins, phenolic resins, epoxy resins and unsaturated polyesters.

5. The method according to claim 1, wherein the intensity of said alternating magnetic field is 5 to 10 times the coercive force (Hc) of the heating-medium.

6. The method according to claim 1, wherein the frequency for the high-frequency power source is 1 to 100 KHz.