GB2167001A - Method of moulding a frame around a household sieve - Google Patents
Method of moulding a frame around a household sieve Download PDFInfo
- Publication number
- GB2167001A GB2167001A GB08525912A GB8525912A GB2167001A GB 2167001 A GB2167001 A GB 2167001A GB 08525912 A GB08525912 A GB 08525912A GB 8525912 A GB8525912 A GB 8525912A GB 2167001 A GB2167001 A GB 2167001A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sieve
- mesh
- region
- mould
- household
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000000465 moulding Methods 0.000 title 1
- 239000004033 plastic Substances 0.000 claims abstract description 17
- 229920003023 plastic Polymers 0.000 claims abstract description 17
- 238000001746 injection moulding Methods 0.000 claims abstract description 11
- 238000010276 construction Methods 0.000 claims abstract description 6
- 239000002184 metal Substances 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 abstract description 5
- 238000002347 injection Methods 0.000 abstract description 4
- 239000007924 injection Substances 0.000 abstract description 4
- 238000007598 dipping method Methods 0.000 abstract description 2
- 239000002991 molded plastic Substances 0.000 abstract 1
- 239000003507 refrigerant Substances 0.000 abstract 1
- 238000007493 shaping process Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 7
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J43/00—Implements for preparing or holding food, not provided for in other groups of this subclass
- A47J43/22—Kitchen sifters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14336—Coating a portion of the article, e.g. the edge of the article
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14336—Coating a portion of the article, e.g. the edge of the article
- B29C45/14418—Sealing means between mould and article
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C2045/1486—Details, accessories and auxiliary operations
- B29C2045/14868—Pretreatment of the insert, e.g. etching, cleaning
- B29C2045/14877—Pretreatment of the insert, e.g. etching, cleaning preheating or precooling the insert for non-deforming purposes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C2045/1486—Details, accessories and auxiliary operations
- B29C2045/14934—Preventing penetration of injected material between insert and adjacent mould wall
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/72—Heating or cooling
- B29C45/73—Heating or cooling of the mould
- B29C2045/7343—Heating or cooling of the mould heating or cooling different mould parts at different temperatures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/737—Articles provided with holes, e.g. grids, sieves
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Food Science & Technology (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Combined Means For Separation Of Solids (AREA)
Abstract
A method of producing a household sieve having a sieve mesh of metal wire and an injection-moulded plastics frame comprises providing a marginal region (5) of the mesh sieve (8) with a stepped construction having a short horizontal region (12) so that the two halves of the mould of an injection-moulding machine abut against one another perpendicularly over an area in this region, and substantially at right angles to the adjacent region (8) of the sieve within the marginal region. The invention prevents leakage of the injector plastics into the adjacent region (8), and this may be assisted either by cooling of the mould in the region (12), or by cooling the sieve mesh immediately prior to injection, by dipping it into refrigerant. The opposed halves of the injection mould, may also act as a deep drawing tool, for the shaping of the sieve mesh. <IMAGE>
Description
SPECIFICATION
Method of producing a household sieve
This invention relates to a method of producing a household sieve having a sieve mesh of metal wire which is secured to a closed plastics frame provided with a handle extension and to a household sieve produced by the method according to the invention.
In known sieves of this type, such as described in the German Patent Specification No. 1268337 for example, the plastics material runs into the mesh of the sieve during the injection-moulding operation. The result is a sieve with a poor optical ap
pearance.
The present invention aims to provide a household sieve of the type above mentioned in which the plastics frame is separated from the mesh of the sieve by a sharp edge.
According to the invention, there is provided a
method of producing a household sieve having a sieve mesh of metal wire which is secured to a closed plastics frame provided with a handle extension, wherein the sieve mesh is placed in a mould of an injection moulding machine for forming the frame, a marginal region of the mesh of the sieve being bent substantially at right angles, and wherein the mould halves for forming the frame are so constructed that, immediately behind the bend in the direction of said marginal region of the mesh of the sieve, the clamping force of the machine acts substantially at right angles on the marginal region of the mesh of the sieve and that said marginal region is positively clamped by the two mould halves over at least a short region of the mesh of the sieve.This method makes use of the knowledge that a bend substantially at right angles practically acts like a labyrinth seal and that as a result of the alignment of the clamping force vector of the tool perpendicular to the second half of the tool, the work is always carried out with an optimum width of gap. Wear phenomena in the tool are compensated.
Preferably, the mesh of the sieve and/or the mould halves is/are cooled, at least in the region of contact of the two halves of the tool, that is to say in the narrowest labyrinth region. As a result, a rapid setting of the plastics material is achieved with the result that the edge is particularly sharp.
Overflowing of the plastics material into the further mesh of the sieve is impossible as a result.
The invention also extends to a household sieve produced by the method above described in which the marginal region of the mesh of the sieve is of stepped construction and the plastics frame is disposed after the bend in the mesh of the sieve.
The household sieve produced by the method according to the invention satisfies completely the aesthetic sensibilities of the present-day housewife.
Ugly places with an unevenly smudgy appearance where the plastics material has overflowed are reliably avoided.
The invention will now be further described, by way of example, with reference to the drawings, in
which:
Figure 1 is a side elevation of one embodiment
of a household sieve produced by the method ac
cording to the invention;
Figure 2 is a diagrammatic section through the
mould halves of an injection-moulding machine
with the mesh of a sieve inserted;
Figure 3 shows a detail of the mould halves
shown in Figure 2 to an enlarged scale; and
Figure 4 shows a detail, corresponding to Figure
3, but showing an alternative embodiment.
Referring to the drawings, the mesh 1 of a sleeve
is injection-moulded into a plastics frame 2 which
is provided, at the one side, with a handle extension 3 and, at the other side, with a supporting
hook 4. The marginal region 5 of the mesh 1 of the sieve is of stepped construction, that is to say it first has a vertical portion 6, then a horizontal portion 7 and then changes over into the rounded portion 8.
In the embodiment shown in Figure 4, the vertical portion 6 is dispensed with.
This construction of the marginal region, naturally required by the tool construction, is the essential feature of the invention. The two halves 9 and 10 of the mould of an injection-moulding machine, the half 9 representing the force side and the half 10 the nozzle side, move relative to one another in the direction of the arrow 11. It must be mentioned that it does not really matter which half of the tool represents the force side and which the nozzle side. These are decisions made purely from the point of view of the tool which also depend on the nature of the injection device. Thus, either the mould half 9 or the mould half 10 or both may be movable.
The two halves g and 10 of the mould have a short region 12 which extends at right angles to the direction of the arrow 11. The portion 7 of the mesh of the sieve is thus clamped between the mould halves 9 and 10 over this region 12 as are- suit of which the portion 7 becomes practically horizontal. The region 12 is also at right angles to the direction of flow of the thermoplastic plastics material during its injection into the mould cavity 13 for the plastics frame 2 which is formed between the mould halves 9 and 10 when said mould halves are moved together. As a result, a labyrinth is formed for the plastics material.In addition, the capillaries between the wire mesh are so fine that the setting of the plastics material takes place very quickly in the short region 12 and a shart separation results between the rounded portioh 8 of the mesh of the sieve and the plastics frame 2. As a result of the fact that the two mould halves 9 and 10 push against one another over an area in the short region 12, tool wear is also compensated and only a labyrinth of the thickness of the wire remains. Thus no impairing of the quality of the injection moulding will occur through tool wear.
A further increase in the separating accuracy can be effected by appropriate cooling. One possibility is cooling the tool in the short region 12, another is cooling the mesh 1 of the sieve immediately before the injection-moulding operation, for example by dipping the mesh in a refrigerating agent.
A further refinement of the method according to the invention is achieved if the injection-moulding machine, that is to say the two halves 9 and 10 of the tool, act simultaneously as a deep-drawing tool for the mesh 1 of the sieve.
In any case, the starting point for the injectionmoulding of the plastics frame may appropriately be in the handle extension 3 or in the supporting hook 4.
Claims (6)
1. A method of producing a household sieve having a sieve mesh of metal wire which is secured to a closed plastics frame provided with a handle extension, wherein the sieve mesh is placed in a mould of an injection moulding machine for forming the frame, a marginal region of the mesh of the sieve being bent substantially at right angles, and wherein the mould halves for forming the frame are so constructed that, immediately behind the bend in the direction of said marginal region of the mesh of the sieve, the clamping force of the machine acts substantially at right angles on the marginal region of the mesh of the sieve and that said marginal region is positively clamped by the two mould halves over at least a short region of the mesh of the sieve.
2. A method according to claim 1, wherein the mesh of the sieve and/or the mould halves is/are cooled at least in said short region of the mesh of the sieve.
3. A method according to claim 1 or claim 2, wherein the said marginal region of the mesh of the sieve is bent substantially at right angles by the mould halves when said mould halves are moved together for the injection moulding operation.
4. A method of producing a household sieve substantially as described herein with reference to the drawings.
5. A household sieve produced by the method claimed in any one of the preceding claims, wherein the marginal region of the mesh of the sieve is of stepped construction and the plastics frame is disposed after the bend in the mesh of the sieve.
6. A household sieve substantially as described herein with reference to the drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3440326A DE3440326C2 (en) | 1984-11-05 | 1984-11-05 | Process for producing a household sieve |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8525912D0 GB8525912D0 (en) | 1985-11-27 |
| GB2167001A true GB2167001A (en) | 1986-05-21 |
| GB2167001B GB2167001B (en) | 1989-05-10 |
Family
ID=6249502
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8525912A Expired GB2167001B (en) | 1984-11-05 | 1985-10-21 | Method of producing a household sieve |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE3440326C2 (en) |
| GB (1) | GB2167001B (en) |
| IT (1) | IT1186026B (en) |
| NL (1) | NL8502934A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0266742A3 (en) * | 1986-11-04 | 1989-03-01 | Siebolt Hettinga | Method of molding a composite article |
| ES2113793A1 (en) * | 1994-09-13 | 1998-05-01 | Brau Pellisa Pablo | System for manufacturing sieves |
| EP1621385A1 (en) * | 2004-07-28 | 2006-02-01 | ORIS FAHRZEUGTEILE HANS RIEHLE GmbH | Element for automotive vehicles and method for manufacturing thereof |
| WO2002102569A3 (en) * | 2000-12-14 | 2007-11-15 | Freudenberg Carl Kg | Injection moulding tool for the production of plastic frames for filter cassettes |
| EP3025625A1 (en) * | 2014-11-28 | 2016-06-01 | Nolato Polymer AB | Method for producing a pan and a pan for use in a microwave-oven |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19745919C1 (en) * | 1997-10-17 | 1999-08-12 | Minnesota Mining & Mfg | Injection mold for the encapsulation of plastic around a filter material, filter for filtering fluids and method for producing such a filter |
| DE19955726C1 (en) * | 1999-11-15 | 2001-06-28 | Eupec Pipecoatings Gmbh | Device for plastic sheathing of a pipeline on pipe connections |
| DE102017127056A1 (en) * | 2017-11-16 | 2019-05-16 | Plan B Engineering Solutions Gmbh | Injection molding tool and method for producing an injection molding component |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB599648A (en) * | 1945-09-22 | 1948-03-17 | William Charles Paul Zabel | Strainer and method of forming the same |
| GB1043028A (en) * | 1964-05-25 | 1966-09-21 | Stanley Robert Wilcox | Method for the manufacture of domestic strainers |
| GB1232314A (en) * | 1967-09-29 | 1971-05-19 | ||
| GB1271860A (en) * | 1968-11-07 | 1972-04-26 | App Modernes De Filtration Et | Improvements in or relating to filtration elements and their manufacturing process |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1268337B (en) * | 1959-10-12 | 1968-05-16 | Schaber Hermann | Household sieve |
-
1984
- 1984-11-05 DE DE3440326A patent/DE3440326C2/en not_active Expired - Fee Related
-
1985
- 1985-10-21 GB GB8525912A patent/GB2167001B/en not_active Expired
- 1985-10-28 NL NL8502934A patent/NL8502934A/en not_active Application Discontinuation
- 1985-10-30 IT IT8522661A patent/IT1186026B/en active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB599648A (en) * | 1945-09-22 | 1948-03-17 | William Charles Paul Zabel | Strainer and method of forming the same |
| GB1043028A (en) * | 1964-05-25 | 1966-09-21 | Stanley Robert Wilcox | Method for the manufacture of domestic strainers |
| GB1232314A (en) * | 1967-09-29 | 1971-05-19 | ||
| GB1271860A (en) * | 1968-11-07 | 1972-04-26 | App Modernes De Filtration Et | Improvements in or relating to filtration elements and their manufacturing process |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0266742A3 (en) * | 1986-11-04 | 1989-03-01 | Siebolt Hettinga | Method of molding a composite article |
| ES2113793A1 (en) * | 1994-09-13 | 1998-05-01 | Brau Pellisa Pablo | System for manufacturing sieves |
| WO2002102569A3 (en) * | 2000-12-14 | 2007-11-15 | Freudenberg Carl Kg | Injection moulding tool for the production of plastic frames for filter cassettes |
| EP1621385A1 (en) * | 2004-07-28 | 2006-02-01 | ORIS FAHRZEUGTEILE HANS RIEHLE GmbH | Element for automotive vehicles and method for manufacturing thereof |
| EP3025625A1 (en) * | 2014-11-28 | 2016-06-01 | Nolato Polymer AB | Method for producing a pan and a pan for use in a microwave-oven |
| WO2016083293A1 (en) * | 2014-11-28 | 2016-06-02 | Nolato Polymer Ab | Method for producing a pan and a pan for use in a microwave-oven |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2167001B (en) | 1989-05-10 |
| IT8522661A0 (en) | 1985-10-30 |
| NL8502934A (en) | 1986-06-02 |
| DE3440326C2 (en) | 1996-04-11 |
| DE3440326A1 (en) | 1986-05-15 |
| GB8525912D0 (en) | 1985-11-27 |
| IT1186026B (en) | 1987-11-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20011021 |