Injection-molding method for mesh filter, injection-molding mold, and mesh filter

Patent metadata

Field	Value
Publication number	US-10611069-B2
Application number	US-201615755350-A
Country	US
Kind code	B2
Filing date	Jul 8, 2016
Priority date	Aug 26, 2015
Publication date	Apr 7, 2020
Grant date	Apr 7, 2020

Abstract

A third cavity part for forming a filter part of a mesh filter has opening forming pins of the same number as that of openings for forming regular-octagonal openings of the filter part. The opening forming pins are formed at regular intervals along an X-axis direction and a Y-axis direction, and a diameter of an inscribed circle of the regular octagon is equivalent to the dimension between the adjacent opening forming pins along the X-axis direction and along the Y-axis direction. The interval between a first line and a second line adjacent to the first line of the opening forming pins formed at regular intervals along a direction at 45° to the X-axis direction is equivalent to the interval between a third line and a fourth line adjacent to the third line of the opening forming pins formed at regular intervals along a direction at 135° to the X-axis direction.

First claim

The invention claimed is:

1. An injection-molding method for molding a mesh filter in a cavity of an injection-molding mold, the method comprising:
providing the cavity for forming the mesh filter including a first cavity part for forming a cylindrical inner cylinder of the mesh filter; a second cavity part for forming a cylindrical outer cylinder of the mesh filter surrounding the inner cylinder; and a third cavity part for forming a filter part of the mesh filter connecting an outer circumferential surface of the inner cylinder and an inner circumferential surface of the outer cylinder,
forming the third cavity part along an X-Y plane, in which the X-Y plane is an imaginary plane perpendicular to a center axis of the first cavity part, and the third cavity part is provided with opening forming pins for forming a plurality of regular-octagonal openings which are through holes that open in front and back surfaces of the filter part,
wherein the opening forming pins stand perpendicularly to the X-Y plane, have a regular-octagonal shape thereof when projected on the X-Y plane, have a uniform cross-sectional shape over an entire length thereof, are formed in plurality at regular intervals along the X-axis direction on the X-Y plane and formed in plurality at regular intervals along the Y-axis direction on the X-Y plane, and are configured such that a diameter of an inscribed circle of the regular-octagonal shape is made equivalent to the dimension between the adjacent opening forming pins along the X-axis direction and equivalent to the dimension between the adjacent opening forming pins along the Y-axis direction, thereby forming a plurality of the opening forming pins at regular intervals along a direction at 45° with respect to the X-axis direction, and at regular intervals along a direction at 135° with respect to the X-axis direction,
wherein the interval between a first line and a second line adjacent to the first line of the plurality of opening forming pins formed at regular intervals along the 45°-direction is equivalent to the interval between a third line and a fourth line adjacent to the third line of the plurality of opening forming pins formed at regular intervals along the 135°-direction, and
injecting a melted resin into the first cavity part so as to flow in a gap between the opening forming pins of the third cavity part, and then fill in the second cavity part.

2. The injection-molding method for the mesh filter according to claim 1 , wherein:
a fourth cavity part, for forming an inner filter part of the mesh filter, is formed on a radially inward side of the first cavity part,
the fourth cavity part is formed along the X-Y plane up to the central axis, and is provided with inner opening forming pins of the same number as that of inner openings for forming a plurality of regular-octagonal inner openings which are through holes that open in front and back surfaces of the inner filter part,
the inner opening forming pins stand perpendicularly to the X-Y plane, have a regular-octagonal shape thereof when projected on the X-Y plane, have a uniform cross-sectional shape over an entire length thereof, are formed in plurality at regular intervals along the X-axis direction on the X-Y plane and formed in plurality at regular intervals along the Y-axis direction on the X-Y plane, and are configured such that a diameter of an inscribed circle of the regular-octagonal shape is made equivalent to the dimension between the adjacent inner opening forming pins along the X-axis direction and equivalent to the dimension between the adjacent inner opening forming pins along the Y-axis direction, thereby forming a plurality of the inner opening forming pins at regular intervals along a direction at 45° with respect to the X-axis direction, and at regular intervals along a direction at 135° with respect to the X-axis direction,
the interval between a first line and a second line adjacent to the first line of the plurality of inner opening forming pins formed at regular intervals along the 45°-direction is equivalent to the interval between a third line and a fourth line adjacent to the third line of the plurality of inner opening forming pins formed at regular intervals along the 135°-direction, and
the melted resin injected in the first cavity part is filled in a gap between the inner opening forming pins of the fourth cavity part.

3. The injection-molding method for the mesh filter according to claim 2 , wherein
a diameter of the inscribed circle of each of the opening forming pins is equivalent to a diameter of the inscribed circle of each of the inner opening forming pins.

4. The injection-molding method for the mesh filter according to claim 2 , wherein
a diameter of the inscribed circle of each of the opening forming pins is different from a diameter of the inscribed circle of each of the inner opening forming pins.

5. An injection-molding method for a mesh filter molded in a cavity of an injection-molding mold, the method comprising:
providing the cavity for forming the mesh filter including a first cavity part for forming a disk-like or solid round bar-like center part of the mesh filter; a second cavity part for forming a cylindrical outer cylinder of the mesh filter surrounding the center part; and a third cavity part for forming a filter part of the mesh filter connecting an outer circumferential surface of the center part and an inner circumferential surface of the outer cylinder,
forming the third cavity part along an X-Y plane, in which the X-Y plane is an imaginary plane perpendicular to a center axis of the first cavity part, and is provided with opening forming pins for forming a plurality of regular-octagonal openings which are through holes that open in front and back surfaces of the filter part,
wherein the opening forming pins stand perpendicularly to the X-Y plane, have a regular-octagonal shape thereof when projected on the X-Y plane, have a uniform cross-sectional shape over an entire length thereof, are formed in plurality at regular intervals along the X-axis direction on the X-Y plane and formed in plurality at regular intervals along the Y-axis direction on the X-Y plane, and are configured such that a diameter of an inscribed circle of the regular-octagonal shape is made equivalent to the dimension between the adjacent opening forming pins along the X-axis direction and equivalent to the dimension between the adjacent opening forming pins along the Y-axis direction, thereby forming a plurality of the opening forming pins at regular intervals along a direction at 45° with respect to the X-axis direction and at regular intervals along a direction at 135° with respect to the X-axis direction,
wherein the interval between a first line and a second line adjacent to the first line of the plurality of opening forming pins formed at regular intervals along the 45°-direction is equivalent to the interval between a third line and a fourth line adjacent to the third line of the plurality of opening forming pins formed at regular intervals along the 135°-direction, and
injecting a melted resin into the first cavity part so as to flow in a gap between the opening forming pins of the third cavity part, and then fill in the second cavity part.

6. An injection-molding mold for a mesh filter, comprising:
a cavity for forming the mesh filter including: a first cavity part for forming a cylindrical inner cylinder of the mesh filter; a second cavity part for forming a cylindrical outer cylinder of the mesh filter surrounding the inner cylinder; and a third cavity part for forming a filter part of the mesh filter connecting an outer circumferential surface of the inner cylinder and an inner circumferential surface of the outer cylinder,
wherein the third cavity part is formed along an X-Y

Assignees

• Enplas Corp

Inventors

• Nakahara Toru

Classifications

• B29C45/0046

  Details relating to the filling pattern or flow paths or flow characteristics of moulding material in the mould cavity · CPC title

• B01D39/1692

  Other shaped material, e.g. perforated or porous sheets · CPC title

• B01D2201/0415

  Details of supporting structures · CPC title

• B29L2031/14

  Filters {(optical filters B29L2011/0066, sieves or screens B29L2031/737)} · CPC title

• B01D29/0093

  Making filtering elements not provided for elsewhere · CPC title