INJECTION MOULDING NOZZLE AND TIP THEREFOR

• US 20100015274A1
• Filed: 04/24/2007
• Published: 01/21/2010
• Est. Priority Date: 04/24/2006
• Status: Abandoned Application

• Current Assignee: Volastic Company Limited
• Original Assignee: Volastic Company Limited
• Inventors: Fill, Robert John
• Application Number:
  US12/298,442
• Publication Number:
  US 20100015274A1
• Time in Patent Office: Days
• US Class Current: 425/549
• CPC Class Codes: B29C 45/278 Nozzle tips B29C45/2735 takes precedence

Abstract

An injection moulding tip (3) for an injection moulding nozzle assembly (100) has an inlet (4a) at a first end, at least one outlet (4b) at a second end and a flow path (4) between the inlet (4a) and the outlet (4b). A first portion (26) of the tip (3) adjacent the first end has a first diameter, a second portion (31) adjacent the second end has a second diameter, and a central portion (29) between the first and second portions has a diameter that is greater than the first and second diameters. An injection moulding tip is also disclosed.

Claims

1-33. -33. (canceled)

34. An injection moulding tip for an injection moulding nozzle assembly, the tip including;

An inlet at a first end,

An outlet at a second end,

A flow path between the inlet and the outlet,

A first portion adjacent to the first end having a first diameter,

A second portion, adjacent to the second, end having a second diameter,

And a central portion between, the first and second, portions, the central portion having a diameter that is greater than the first diameter and greater than the second, diameter.

35. The injection moulding tip of claim 34 wherein an external surface of the central portion is continuous with an external surface of a nozzle body to which the tip is to be connected.

36. The injection moulding tip of claim 34 wherein the first portion of the tip is adapted to connect to a nozzle body.

37. The injection, moulding tip of claim 34 wherein, the second portion of the tip is adapted to be connected to a locating means for locating the nozzle assembly relative to a mould.

38. The injection moulding tip of claim 34 wherein the flow path is provided by a tip liner which comprises an integral part of the tip.

39. The injection moulding tip of claim 34 wherein the flow path comprises a separable component from the tip.

40. The injection moulding tip of claim 34 wherein the first and second portions each include an external thread.

41. The injection moulding tip of claim 34 wherein the tip is constructed from a highly thermally conductive material.

42. The injection moulding tip of claim 41 wherein the tip is constructed from beryllium, copper.

43. The injection moulding tip of claim 41 wherein the tip is constructed from a highly thermally conductive carbide material.

44. The injection moulding tip of claim 34 wherein the locating means comprises a material having a significantly lower thermal conductivity than the material of the tip.

45. The injection moulding tip of claim 34 wherein the nozzle body comprises a material having a significantly lower thermal conductivity than the tip.

46. An injection moulding tip for an injecting moulding nozzle, the tip being constructed from a highly thermally conductive material, and including;

A first portion for connection to the nozzle body,

A second portion for connection to a locating means,

A central portion disposed between the first and second portions, the central portion having an external surface adapted to contact a heating means.

47. The injection moulding tip of claim 46 wherein the tip comprises at least 20% of the total mass of a nozzle assembly with which it is connected in use.

48. The injection moulding tip of claim 46 wherein the tip includes a sleeve and a tip liner provided inside the sleeve, the tip liner defining a flow path, wherein the sleeve comprises at least 14% of the total mass of a nozzle assembly with which it is connected in use.

49. The injection moulding tip of claim 46, wherein the sleeve is substantially double the mass of the tip liner.

50. The injection moulding tip of claim 46, wherein, the central, portion of the tip comprises at least substantially 50% of the total mass of the tip excluding the tip liner.

51. An injection moulding nozzle including;

A nozzle body;

a tip adapted, for provision on the body, the tip having an inlet, an outlet, a fluid flow path between the inlet and the outlet, a shank portion between the inlet and the outlet, and an external, surface of the shank portion being adapted to contact a heating means.

52. The injection moulding nozzle of claim 51 wherein the tip has a nigh thermal conductivity.

53. The injection moulding nozzle of claim 51 wherein the shank portion includes a sleeve, an outer surface of which provides the external, surface of the shank portion which is adapted to contact the heating means, and a tip liner provided within the sleeve in which the flow path, is provided.

54. The injection moulding nozzle of claim 53 wherein the sleeve is in intimate thermal contact with the tip liner between the inlet and said at least one outlet.

55. The injection moulding nozzle of claim 53 wherein the sleeve has a high thermal conductivity.

56. The injection moulding nozzle of claim 53 wherein the tip liner has a high thermal conductivity.

57. Tins injection moulding nozzle of claim 51 wherein the nozzle includes a heating means in contact with the outer surface of the sleeve.

58. The injection moulding nozzle of claim 51 wherein the nozzle includes a cover or housing and the heating means is attached to or integral with said cover or housing.

59. The injection moulding nozzle of claim 53 wherein the sleeve has a thermal conductivity of at least three times that of the housing and/or nozzle body.

60. The injection moulding nozzle of claim 59 wherein the sleeve has a thermal conductivity of at least five times that of the housing and/or nozzle body.

61. The injection moulding nozzle of claim 51 wherein the nozzle includes a body having an inlet, an outlet and a fluid path extending between the inlet and the outlet, wherein in use the body positioned such that the outlet is in fluid communication with the inlet of the tip.

62. The injection moulding nozzle of claim 51 wherein the tip is constructed from beryllium copper.

63. The injection moulding nozzle of claim 53 wherein the tip liner is constructed from a carbide having a thermal conductivity approximately equal to that of the sleeve.

64. The injection moulding nozzle of claim 53 wherein the sleeve extends substantially the distance between the inlet and outlet of the elongate tip.

65. The injection moulding nozzle of claim 51 wherein the tip has a first end adapted for disposal internally of the body and a second end adapted for disposal internally of the locating means.

66. The injection moulding nozzle of claim 53 the sleeve has a first end adapted for disposal internally of the body and a second end adapted for disposal internally of the locating means.