EP0384657A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Injection moulding
Assignee: Crown Packaging UK Ltd
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Filing: 1990-02-15
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Granted: —
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Expires: 2010-02-15
Abstract
Abstract A hollow article, especially a syringe body, having a tubular portion (1) and a flange (4) is injection moulded in a mould having a single injection orifice located at the extremity of the mould cavity part which defines the flange. The mould cavity has a pair of channels which define ribs on the flange of the syringe body and which have substantial equal length and area for conducting molten material simultaneously to opposite sides of the cavity part which forms the tubular portion.
Inventors
- 👤 Roderick Michael De'ath
- 👤 Donald Ernest Griffiths
- 👤 Andrew Hodkinson
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 22:49
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/26; A; A61; A61M; A61M5/00; A61M5/178; A61M5/31; A61M5/3129; A61M5/3135; B29C45/0046; B29C45/261
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
135 words
A method of manufacturing by injection moulding an article comprising a hollow portion with an external flange connected thereto, the method comprising filling a mould cavity having the shape of said article with thermoplastic material, characterised in that the material is injected into the cavity through a single orifice opening into a first cavity part defining the shape of said flange, said first cavity part including a pair of channels of substantially equal length and flow cross-section leading from the injection orifice and connecting to a second cavity part defining the shape of the hollow portion, and said channels opening into the second cavity part defining the shape of the hollow portion at respective positions on opposite sides thereof, whereby molten material is conducted into said second cavity part substantially simultaneously via the two channels.
Claim 2
Independent Claim
135 words
A method of manufacturing by injection moulding an article comprising a hollow portion with an external flange connected thereto, the method comprising filling a mould cavity having the shape of said article with thermoplastic material, characterised in that the material is injected into the cavity through a single orifice opening into a first cavity part defining the shape of said flange, said first cavity part including a pair of channels of substantially equal length and flow cross-section leading from the injection orifice and connecting to a second cavity part defining the shape of the hollow portion, and said channels opening into the second cavity part defining the shape of the hollow portion at respective positions on opposite sides thereof, whereby molten material is conducted into said second cavity part substantially simultaneously via the two channels.
Claim 3
Dependent Claim
37 words
A method according to claim 1, wherein the channels are arranged to form on the flange a pair of ribs of increased thickness extending in opposite directions along the edge of the flange from the injection orifice.
Claim 4
Dependent Claim
72 words
An injection moulded article comprising a tubular portion (1) having an external flange (4), characterised in that the flange has a pair of symmetrical ribs (7, 8) extending from a common point at the outer edge of the flange to respective points of intersection with the tubular part at generally diametrically opposed locations, said ribs being constituted by runners which supply material to form the tubular portion during manufacture of the article.
Claim 5
Dependent Claim
72 words
An injection moulded article comprising a tubular portion (1) having an external flange (4), characterised in that the flange has a pair of symmetrical ribs (7, 8) extending from a common point at the outer edge of the flange to respective points of intersection with the tubular part at generally diametrically opposed locations, said ribs being constituted by runners which supply material to form the tubular portion during manufacture of the article.
Claim 6
Dependent Claim
40 words
An article as claimed in claim 3, wherein the ribs (7, 8) extend in opposite directions around the peripheral edge of the flange from a central position corresponding to the location of an injection orifice during moulding of the article.
Claim 7
Dependent Claim
27 words
An article according to claim 4, wherein the flange includes reinforcing webs (10) interconnecting the tubular portion with the ribs at positions spaced from said central position.
Claim 8
Dependent Claim
36 words
An article as claimed in claim 3, 4 or 5, wherein the tubular portion is the barrel (1) of a syringe body, and the flange is a wing (5) at the rear end of the barrel.
Claim 9
Dependent Claim
105 words
An injection mould comprising a plurality of mould parts which when closed together define a mould cavity including one part for forming a hollow article portion and an adjoining part for forming an external flange on the hollow portion, characterised in that a single injection gate is located at the outer extremity of said adjoining cavity part, and said adjoining cavity part includes a pair of channels each extending from said gate to said one cavity part, said channels being of substantially equal length and area and being arranged to conduct moulding material into the said one cavity part substantially simultaneously at opposite sides thereof.
Claim 10
Dependent Claim
105 words
An injection mould comprising a plurality of mould parts which when closed together define a mould cavity including one part for forming a hollow article portion and an adjoining part for forming an external flange on the hollow portion, characterised in that a single injection gate is located at the outer extremity of said adjoining cavity part, and said adjoining cavity part includes a pair of channels each extending from said gate to said one cavity part, said channels being of substantially equal length and area and being arranged to conduct moulding material into the said one cavity part substantially simultaneously at opposite sides thereof.
Claim 11
Dependent Claim
19 words
An injection mould according to claim 7 wherein said channels extend around the periphery of said adjoining cavity part.
References Cited (Backward Citations)
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