Corona discharge treating method and apparatus for resin moldings

Claim 2

A corona discharge treating method for a three-dimensional resinous article having a hole and a corner, which comprises the steps of: (a) providing a rigid corona discharge electrode having a rod-like gripped portion and a spherical discharge portion; (b) setting said article on a jig body having a counter electrode and a buffering plate made of a dielectric material on said counter electrode in a postion corresponding to said hole of said article; and (c) moving said spherical discharge portion of said corona discharge electrode along a predetermined path along a surface of said article while said spherical discharge portion is generating a corona discharge, said spherical discharge portion being attached to a top end of said rod-like gripped portion of said corona discharge electrode and having a diameter greater than that of said gripped portion.

Claim 3

A corona discharge treating method according to claim 1, in which a radius at said spherical discharge portion of said discharge electrode is smaller than a radius at said corner of said three-dimensional resinous article.

Claim 4

A corona discharge treating method according to claim 1, in which said discharge electrode is moved relative to said article by moving means for moving said discharge electrode.

Claim 5

A corona discharge treating method according to claim 1, in which said article is an automobile instrument panel having a hole and a corner.

Claim 6

A corona discharge treating method according to claim 1, which further comprises the step of: (c) relatively moving another corona discharge electrode having a rod-like discharge portion along the surface of said article.

Claim 7

The corona discharge treating method of claim l, wherein: in step (b), said spherical discharge portion generates a corona discharge through a high-frequency energy applying means connected to the discharge electrode, and the discharge power output from the spherical discharge portion is controlled to be constant regardless of changes in distance between the surface of the article and the spherical discharge portion.

Claim 8

A corona discharge treating method according to claim 1, wherein: during step (c), said corona discharge electrode is moved with said gripped portion always held in a vertical state.

Claim 9

A corona discharge treating method for a three-dimensional resinous article having a hole and a corner, which comprises the steps of: (a) providing a rigid corona discharge electrode having a rod-like gripped portion and a spherical discharge portion; (b) setting said article on a jig body having a counter electrode and a buffering plate made of a dielectric material on said counter electrode in a position corresponding to said hole of said article; and (c) moving said spherical discharge portion of said corona discharge electrode along a predetermined path along a surface of said article while said spherical discharge portion is generating a corona discharge through high-frequency energy applying means connected to said discharge electrode, said spherical discharge portion being attached to a top end of said rod-like gripped portion of said corona discharge electrode and having a diameter greater than that of said gripped portion, a discharge power output from said spherical discharge portion being controlled to be constant regardless of changes in distance between the surface of said article and said spherical discharge portion.

Claim 10

A corona discharge treating method for a three-dimensional resinous article having a hole and a corner, which comprises the steps of: (a) providing a rigid corona discharge electrode having a rod-like gripped portion and a spherical discharge portion; (b) setting said article on a jig body having a counter electrode and a buffering plate made of a dielectric material on said counter electrode in a position corresponding to said hole of said article; and (c) moving said spherical discharge portion of said corona discharge electrode along a predetermined path along a surface of said article while said spherical discharge portion is generating a corona discharge through high-frequency energy applying means connected to said discharge electrode, said spherical discharge portion being attached to a top end of said rod-like gripped portion of said corona discharge electrode and having a diameter greater than that of said gripped portion, a discharge power output from said spherical discharge portion being controlled to be constant regardless of changes in distance between the surface of said article and said spherical discharge portion.

Claim 11

A corona discharge treating apparatus for a three-dimensional resinous article having a hole and a corner, which comprises: (a) a rigid corona discharge electrode including a rod-like gripped portion and a spherical discharge portion attached to a top end of said rod-like gripped portion, said spherical discharge portion having a diameter greater than that of said gripped portion; (b) a jig body for setting said article, said jig body having a counter electrode and a buffering plate made of a dielectric material provided on said counter electrode in a position corresponding to said hole of said article; and (c) moving means for three-dimensionally moving said spherical discharge portion along a predetermined path along a surface of said article while said spherical discharge portion is generating a corona discharge.

Claim 12

A corona discharge treating apparatus for a three-dimensional resinous article having a hole and a corner, which comprises: (a) a rigid corona discharge electrode including a rod-like gripped portion and a spherical discharge portion attached to a top end of said rod-like gripped portion, said spherical discharge portion having a diameter greater than that of said gripped portion; (b) a jig body for setting said article, said jig body having a counter electrode and a buffering plate made of a dielectric material provided on said counter electrode in a position corresponding to said hole of said article; and (c) moving means for three-dimensionally moving said spherical discharge portion along a predetermined path along a surface of said article while said spherical discharge portion is generating a corona discharge.

Claim 13

A corona discharge treating apparataus according to claim 9, in which a radius at said spherical discharge portion of said discharge electrode is smaller than a radius at said corner of said three-dimensional resinous article.

Claim 14

A corona discharge treating apparatus according to claim 9, which further comprises high-frequency energy applying means for applying high frequency energy to said discharge electrode, and discharge-output control means provided in said high-frequency applying means for keeping a discharge output of said discharge electrode constant even if a distance between the surface of said article and said spherical discharge portion varies.

Claim 15

A corona discharge treating apparatus for a resin molding according to claim 11, in which said high-frequency energy applying means includes a high-voltage transformer having a primary coil and a secondary coil electrically connected to said discharge electrode, and an oscillator circuit electrically connected to said primary coil of said high-voltage transformer, and in which said discharge-output control means includes a detecting circuit for detecting a high-frequency voltage and a high-frequency current impressed onto said primary coil of said high-voltage transformer, and an oscillation-output control circuit for controlling an oscillation output of said oscillator circuit on the basis of values detected by said detecting circuit.

Claim 16

A corona discharge treating apparatus for a resin molding according to claim 12, in which said high-frequency energy applying means includes a rectifier connected to an input side of said oscillator circuit, and a tuning circuit connected to an out put side of said oscillator circuit and to said primary coil of said high-voltage transformer for removing rectangular harmonic components generated from said oscillator circuit to thereby transmit a sinusoidal wave of substatially fixed frequency.

Claim 17

A corona discharge treating apparatus for a resin molding according to claim 11, further comprising a control unit for controlling operations of said moving means and said high-frequency applying means.

Claim 18

A corona discharge treating apparatus for a resin molding according to claim 14, further comprising exhaust means for exhausting gas generated in corona discharge treatment.

Claim 19

A corona discharge treating apparatus according to claim 9, which further comprises another corona discharge electrode having a rod-like discharge portion.

Claim 20

A corona discharge treating apparatus for a resin molding according to claim 9, which further comprising a mesh-like shielding cylinder provided around said discharge electrode to thereby prevent radiation of high-frequency noises produced from said discharge electrode in corona discharge.

Claim 21

The corona discharge treating appartus of claim 9, further comprising: (d) high-frequency energy applying means connected to said discharge electrode for applying high-frequency energy to said discharge electrode for thereby causing a corona discharge through said spherical discharge portion; and discharge power output control means connected to said discharge electrode for maintaining a constant discharge power output from said spherical discharge portion regardless of changes in distance between the surface of the article and said spherical discharge portion.

Claim 22

A corona discharge treating apparatus according to claim 9, wherein said moving means consists of three moving mechanisms, each said moving mechanism moving said spherical discharge portion in one moving direction across the other two moving directions of said other two moving mechanisms so that the three moving mechanisms cooperate so as to three-dimensionally move said spherical discharge portion.

Claim 23

A corona treating apparatus according to claim 19, wherein said three moving directions are perpendicular to each other.

Claim 24

A corona discharge treating apparataus for a three-dimensional resinous article having a hole and a corner, which comprises: (a) a rigid corona discharge electrode including a rod-like gripped portion and a spherical discharge portion attached to a top end of said rod-like gripped portion, said spherical discharge portion having a diameter greater than that of said gripped portion; (b) a jig body for setting said article, said jig body having a counter electrode and a buffering plate made of a dielectric material provided on said counter electrode in a position corresponding to said hole of said article; (c) high-frequency energy applying means connected to said discharge electrode and for applying high-frequency energy to said discharge electrode thereby causing a corona discharge through said spherical discharge portion; (d) moving means for three-dimensionally moving said spherical discharge portion along a predetermined path along a surface of said article while said spherical discharge portion is generating the corona discharge; and (e) discharge power output control means connected to said discharge electrode and for maintaining constant a discharge power output from said spherical discharge portion regardless of changes in distance between the surface of said article and said spherical discharge portion.

Claim 25

A corona discharge treating apparataus for a three-dimensional resinous article having a hole and a corner, which comprises: (a) a rigid corona discharge electrode including a rod-like gripped portion and a spherical discharge portion attached to a top end of said rod-like gripped portion, said spherical discharge portion having a diameter greater than that of said gripped portion; (b) a jig body for setting said article, said jig body having a counter electrode and a buffering plate made of a dielectric material provided on said counter electrode in a position corresponding to said hole of said article; (c) high-frequency energy applying means connected to said discharge electrode and for applying high-frequency energy to said discharge electrode thereby causing a corona discharge through said spherical discharge portion; (d) moving means for three-dimensionally moving said spherical discharge portion along a predetermined path along a surface of said article while said spherical discharge portion is generating the corona discharge; and (e) discharge power output control means connected to said discharge electrode and for maintaining constant a discharge power output from said spherical discharge portion regardless of changes in distance between the surface of said article and said spherical discharge portion.