Stock material or miscellaneous articles – Composite
Patent
1995-06-15
1999-01-26
Yamnitzky, Marie
Stock material or miscellaneous articles
Composite
4284752, 4284763, 428483, 428515, 428 663, 428 666, 428212, 215235, 215306, 215364, 2643288, 26432811, 26433111, 264345, 264299, B65D 5100, B29C 4500
Patent
active
058636552
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a plastics closure unit having an outlet part, a closure part which is joined to the outlet part even when the closure unit is in an open condition, and at least one pair of sealing faces which seals the outlet part and the closure part together when the closure unit is in a closed condition and also to a method for manufacture of such a plastics closure unit.
The invention also relates secondly to a plastics closure with an opening part and a closure part which are designed in such a way that when the closure unit is in the closed condition at least one sealing face on the opening part is pressed mechanically against a corresponding sealing face on the closure part, and the invention relates thirdly to a method for the manufacture of this closure which is manufactured in the open condition by a casting operation and which is closed after manufacture.
Plastics closure units which have an outlet part and a closure part are know for use e.g. on glass or metal formed bodies etc. Advantageously, these closure units are designed in such a way that the closure part is joined to the outlet part even in the open condition and that they can also be re-closed sealingly to a certain extent after the first opening.
Such closure units are usually manufactured by way of an injection-moulding method. If the closure unit is made of one material and is cast in the open condition, the manufacture consists of one single casting step and is therefore very economical. However, since the outlet part has a different function from that of the closure part, if a closure unit is made of only one material, that material obviously cannot give optimum performance of both functions, i.e. in other words, compromises have to be made in the selection of the material. These compromises often result in not very good sealing of the closed or re-closed closure unit.
Closure units are also known which are made of two or more different materials whereby the afore-mentioned problem can be avoided. These types of closure unit usually consist of an outlet part and a closure part or parts of those parts which are manufactured separately from different materials, wherein, when the closure unit is in the open condition, the outlet part and closure part are not secured together and only form an actual unit in the closed condition. The individual parts are then usually joined together in an additional assembly step, e.g. by joining form fit means provided, by pasting together, welding etc., which increases the cost of manufacture.
The aim of the invention is to create a closure unit which combines the advantage of having one closure unit made of at least two materials with the advantages of having a closure unit made of only one material. In other words, this means that the closure unit is one where the individual parts give optimum performance in respect of their functions by virtue of suitable material, but is nonetheless able to be manufactured in one single casting process and without additional assembly steps to join individual parts together.
This problem is solved by the closure unit and the method of manufacture as defined in the claims.
The closure unit according to the invention has an outlet part and a closure part which are joined together even when the closure unit is in the open condition, and it is made of at least two materials, wherein the regions of both materials are joined together by a flow seam. This flow seam is disposed, for example, in the connecting region between the outlet part and the closure part in such a way that the outlet part is made entirely of outlet material and that the closure part is made entirely of closure material. However, the flow seam can also extend through one of the parts whereby that part is made of the two materials. In each case, the flow seam extends between the regions of the two materials in such a way that the pair of sealing faces by means of which the closure unit is kept sealed in the closed condition consists at least partly of a sealing face, on the side of the outle
REFERENCES:
patent: 4132225 (1979-01-01), Whattam
patent: 4489844 (1984-12-01), Breskin
patent: 4784817 (1988-11-01), Towns et al.
patent: 4826029 (1989-05-01), Skoglie
patent: 4885121 (1989-12-01), Patel
patent: 5048730 (1991-09-01), Forsyth et al.
patent: 5289930 (1994-03-01), Inouye
patent: 5372284 (1994-12-01), Mock
patent: 5439124 (1995-08-01), Mock
patent: 5460768 (1995-10-01), Akao et al.
Tetra Laval Holdings & Finance S. A.
Yamnitzky Marie
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