GB2338675A - Improved polymer glazing system - Google Patents
Improved polymer glazing system Download PDFInfo
- Publication number
- GB2338675A GB2338675A GB9825460A GB9825460A GB2338675A GB 2338675 A GB2338675 A GB 2338675A GB 9825460 A GB9825460 A GB 9825460A GB 9825460 A GB9825460 A GB 9825460A GB 2338675 A GB2338675 A GB 2338675A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mould
- cavity
- resin
- coating
- substrate
- 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
- 229920000642 polymer Polymers 0.000 title description 3
- 239000000463 material Substances 0.000 claims abstract description 51
- 229920005989 resin Polymers 0.000 claims abstract description 43
- 239000011347 resin Substances 0.000 claims abstract description 43
- 239000011521 glass Substances 0.000 claims abstract description 36
- 239000000758 substrate Substances 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 33
- 239000011248 coating agent Substances 0.000 claims abstract description 31
- 238000000576 coating method Methods 0.000 claims abstract description 31
- 238000002347 injection Methods 0.000 claims abstract description 27
- 239000007924 injection Substances 0.000 claims abstract description 27
- 229920005992 thermoplastic resin Polymers 0.000 claims abstract description 22
- 238000001816 cooling Methods 0.000 claims abstract description 19
- 239000000945 filler Substances 0.000 claims abstract description 18
- 230000009977 dual effect Effects 0.000 claims abstract description 17
- 229920000515 polycarbonate Polymers 0.000 claims abstract description 15
- 239000004417 polycarbonate Substances 0.000 claims abstract description 14
- 239000004033 plastic Substances 0.000 claims abstract description 13
- 229920003023 plastic Polymers 0.000 claims abstract description 13
- 239000003365 glass fiber Substances 0.000 claims abstract description 11
- 238000002844 melting Methods 0.000 claims abstract description 6
- 230000008018 melting Effects 0.000 claims abstract description 6
- 239000004677 Nylon Substances 0.000 claims abstract description 5
- 229920001778 nylon Polymers 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 12
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims 1
- 239000006120 scratch resistant coating Substances 0.000 abstract description 2
- 229920000178 Acrylic resin Polymers 0.000 abstract 1
- 239000004925 Acrylic resin Substances 0.000 abstract 1
- 238000009736 wetting Methods 0.000 description 3
- 239000002826 coolant Substances 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000004926 polymethyl methacrylate Substances 0.000 description 2
- 239000004425 Makrolon Substances 0.000 description 1
- 229920005482 Oroglas® Polymers 0.000 description 1
- 229920005372 Plexiglas® Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
Classifications
-
- 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
- B29C45/16—Making multilayered or multicoloured articles
-
- 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
- B29C45/14778—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 the article consisting of a material with particular properties, e.g. porous, brittle
- B29C45/14786—Fibrous material or fibre containing material, e.g. fibre mats or fibre reinforced material
-
- 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
- B29C45/16—Making multilayered or multicoloured articles
- B29C45/1671—Making multilayered or multicoloured articles with an insert
-
- 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
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
- B29K2105/16—Fillers
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
A method of producing a component, comprising a scratch resistant coating on a plastics substrate (40), in which a mould (1,21) is heated, a glass filler material (11,31) placed in the mould, and a resin material (35) injected into the mould to impregnate the glass filler material, the resin and the glass filler material thereby forming the coating, the mould being heated to a temperature in the region of the melting temperature of the resin and kept at that temperature for a period following injection of the resin, before cooling of the mould and removal of the component from the mould. The glass filler material may be in the form of a fibrous glass mat placed in the mould before dual injecting thermoplastic resin and a substrate on which the resin-impregnated glass mat form a coating. The resin may be a polycarbonate, a nylon or an acrylic resin.
Description
Improved Polymer Glazing System 2338675 The present invention relates to
an improved polymer glazing system, having particular, but not exclusive, use in the production of a translucent automotive component such as a lamp lens or window panel.
It is known to use polycarbonate plastics material as a clear moulding material due to its specific weight advantages. However, polycarbonate is less resistant to scratching than glass. While a polycarbonate moulding can be provided with a siloxane coating, such a coating involves dip, brush or spray application techniques in a clean environment and also represent a further processing step.
An alternative route is known from GB 2 305 890 A. A method of producing a scratch resistant coating on a plastics substrate comprises providing a resin material such as polycarbonate, mixing the resin with a glass finer material causing the resin and glass mixture to form the coating on the substrate in a mould. Such a technique does not involve the dip, brush or spray coatings of the previously described route.
However, there have been difficulties in providing repeatedly producing a sufficiently clear article for the technique to enter mass production. One reason for this is that although the resin and the glass filler have a similar or the same refractive index, the final article can appear cloudy. This is believed to be because of incomplete wetting of the glass filler by the resin. In addition the less translucent articles produced by this technique tend to lack the necessary integral strength for use in large size applications.
It is an aim of the present invention to eliminate, or substantially reduce, these problems.
According to a first aspect of the present invention a method of producing a component comprises the steps of providing a mould having a cavity, heating the mould to a predetermined temperature, placing a glass filler material in the cavity, closing the mould, injecting a thermoplastic resin material into the cavity to fill the cavity and to impregnate the glass filler material, then cooling the mould, before opening the mould to remove the component, characterised in that prior to cooling the mould is maintained at the predetermined temperature for a time beyond that required to allow the cavity to be filled.
According to a second aspect of the invention a method of producing a coating on a plastic substrate, the coating and the substrate being formed by dual injection, comprises the steps of providing a thermoplastic resin material and a substrate material, providing a glass filler in the form of a fibrous glass mat, placing the mat in a mould, closing the mould and heating the mould to a predetermined temperature, dual injecting the thermoplastic resin and the substrate material into the mould to fill the cavity whereby the thermoplastic resin is injected into the mould ahead of the substrate material in order to impregnate the glass mat so that the resin impregnated glass mat forms the coating on the substrate, cooling the mould, characterised in that prior to cooling the mould is maintained at the predetermined temperature for a time beyond that required to allow the cavity to be filled.
According to a third aspect of the invention, a method of providing a coating on a plastic substrate, the coating and the substrate being formed by dual injection, comprises the steps of providing a thermoplastic resin material, mixing the thermoplastic resin with a glass filler material to form a mixture, heating a mould having a mould cavity to a predetermined temperature, dual injecting the mixture and the substrate material into the-mould cavity to fill the mould cavity whereby the mixture is injected into the mould ahead of the substrate material in order to form the coating on the substrate, and cooling the mould characterised in that prior to cooling the mould is maintained at the predetermined temperature for a time beyond that required to allow the cavity to be filled.
According to a forth aspect of the invention, a method of providing a coating on a plastic substrate, the coating and the substrate being formed by dual injection, comprises the steps of providing a thermoplastic resin material, mixing the thermoplastic resin with a glass fifier material to form a mixture, heating a mould having a mould cavity to a predetermined temperature, dual injecting the mixture and the coating material into the mould cavity to fiR the mould cavity whereby the coating material is injected into the mould ahead of the mixture in order to form the coating on the substrate, and cooling the mould characterised in that prior to cooling the mould is maintained at the predetermined temperature for a time beyond that required to allow the cavity to be flUed.
Preferably, the predetermined temperature is within the melting temperature of the thermoplastic resin. For example if polyearbonate is used as the resin the temperature is in the region of 3000C. Alternatively, if nylon is used as the resin, the predetermined temperature will be in the region of 2700C. Further alternatively, if acrylic is used as the resin, the predetermined temperature will be in the region of 2800C. It will be understood that the optimum predetermined temperature in any particular case will depend upon the commercial blend of thermoplastic resin used.
Preferably, the resin is a non-pigmented resin.
According to a fifth aspect of the invention a component such as a vehicle component is made by a method according to a previous aspect of the invention.
A component according to the invention advantageously has improved scratch resistance and greater rigidity than a component produced by the route of GB 2 305 890 A.
The invention will now be described by way of example only with reference to 5 the accompanying drawings, in which:
Figure 1 is a diagrammatic cross-section through a two section mould in an open position with a glass filler material in position; and Figure 2 is a diagrammatic cross-section through a two section mould in a closed position following dual injection.
Riferring first to Figure 1, a mould assembly 1 comprises a first mould section 2 and a second mould section 3, the first mould section 2 defining a cavity having a first mould surface 4 complimentary to a second mould surface 5 on the second mould section 3. The first mould section 2 is formed with an injection passage 6 through which plastics material can be injected from an injection moulding machine (not shown). The first mould section is backed with a first insulating plate 7 through which the injection passage 6 also extends.
The second mould section is backed by a heating plate 8, which in turn is backed by a second insulating plate 9. The heating plate may be heated by any convenient means. The second mould section is additionally provided with a number of passages 10 extending through the second mould section.
The operation of the mould assembly will now be described with reference to a first example. The second mould section 3 is heated to the required temperature. A glass filler in the form of a glass weave 11 is placed in the mould assembly. The mould assembly is closed and the mould assembly allowed to heat to the required temperature. A clear resin in the form of a polycarbonate is injected through the injection passage into the mould cavity to impregnate the glass weave. A suitable polycarbonate is MAKROLON (Registered Trade Mark of Bayer AG).
The resin does not solidify because the mould is heated to a temperature within the melting temperature of the resin. In this example, the temperature of the mould is in the region of HO'C. The mould is held at this temperature to allow sufficient time for the resin fully to wet the fibres of the weave. In the present example a time of about 9 minutes was found to be sufficient.
The mould is then cooled. This may conveniently be achieved by passing a coolant through the passages 10 extending through the mould assembly. In the present example it has been found that a cooling period of about 5 minutes is sufficient for the component to have achieved sufficient structural integrity for the mould assembly to be opened to allow the component to be removed from the mould assembly.
It is found that this method allows more complete wetting of the glass finer material than previous methods. This in turn means that the transmission of light through the component is better than previously, giving the component produced a high degree of translucency, and in the case of a non-pigmented resin, a high degree of transparency. It has further been found that a component manufactured according to the invention advantageously has improved structural stiffness in comparison with a similar component produced by the methods described in GB 2 305 890 A.
As an alternative, a nylon material may be used as the resin. In such a case, the mould assembly is preferably heated to a temperature in the region of 270Q and is held at this temperature following injection for about 10 minutes. The -6 mould is then cooled for about 5 minutes. A suitable nylon is GRILAMID TR90 (Registered Trade Mark of Ems Grillon).
As a further alternative, an acrylic material may be used as the resin. 'in such a case, the mould assembly is preferably heated to a temperature in the region of 2STC, and is held at this temperature following injection for about 10 minutes. The mould is then cooled for about 5 minutes. A suitable acrylic material is PLEXIGLAS (Registered Trade Mark of Rohm & Haas).
Alternatively, OROGLAS an acrylic material obtained from Rohm & Haas may be used. In this case the mould assembly is preferably heated to a temperature in the region of 260Q and is held at this temperature following injection for about 10 minutes. The mould is then cooled for about 5 minutes.
It will be understood that the optimum temperature in any particular case will depend upon the commercial blend of resin used.
In addition, if the glass fibres have been sized to aid wetting of the fibres by the resin, it will be understood that the resin is to be chosen to match the wetting agent of the glass fibres both chemically and optically.
In an alternative embodiment, the glass fibre mat may be hot pressed prior to use to be more accurately shaped to take the form of the mould cavity.
Referring now to Figure 2, a mould assembly 21 comprises a first mould section 22 and a second mould section 23, the first mould section 22 defining a cavity having a first mould surface 24 complimentary to a second mould surface 25 on the second mould section 23. The first mould section 22 is formed with an injection passage 26 through which plastics material can be injected from an injection moulding machine (not shown). The first mould section is backed with a first insulating plate 27 through which the injection passage 26 also extends.
The second mould section is backed by a heating plate 28, which in turn is backed by a second insulating plate 29. The heating plate may be heated by any convenient means. The second mould section is additionally provided with a number of passages 30 extending through the second mould section.
The component is formed by means of dual injection. The mould assembly 20 is mounted on a dual injection machine of a known kind. The machine is adapted to inject a thermoplastic resin 35 slightly ahead of a substrate material 40 such as a polycarbonate. Initially a glass fibre mat 31 is placed in the mould assembly 21 as in the previous example. Again the mould assembly is heated to a temperature in the region of the melting temperature of the resin prior to injection of the resin. Injection of the polycarbonate causes the polycarbonate to spread the resin 35 over the glass mat 31 to cover and impregnate the glass mat 31. Injection is continued until the entire mould cavity is coated with the resin and the resin envelopes the injected polycarbonate. The mould is held at this temperature to allow sufficient time for the resin fully to wet the fibres of the glass mat 31. In the present example a time of about 9 minutes was found to be sufficient.
The mould is then cooled. This may conveniently be achieved by passing a coolant through the passages 30 extending through the mould assembly. In the present example it has been found that a cooling period of about 5 minutes is sufficient for the component to have achieved sufficient structural integrity for the mould assembly to be opened to allow the component to be removed from the mould assembly.
In a further embodiment of the invention, instead of positioning a glass mat 30 in the mould assembly 20 as shown in Figure 2, the thermoplastic resin 35 is mixed with glass fibres or other glass particles prior to injection.
In a still further embodiment of the invention, the dual injection machine is adapted to inject a coating material such as a polycarbonate slightly ahead of a mixture of thermoplastic resin and glass fibres or other glass particles. The mixture is again formed prior to injection. The mould assembly is heated to a temperature in the region of the melting temperature of the resin prior to injection of the resin. Injection of the mixture causes the mixture to spread the coating over the mould cavity. Injection is continued until the entire mould cavity is coated and the coating envelopes the injected mixture. The mould is held at the predetermined temperature for a time beyond that required to allow the cavity to be filled.
As in the first example, these methods can be used with a variety of different resins.
In a further embodiment (not shown) a film may be provided to line one of the mould surfaces. The mould is then used following the steps of one of the methods described above. The film may be used to stop the glass fibres from sticking to the mould surface. The film may also be used to improve the surface finish of the component.
The film, for example an aluminium sheet, can be removed from the component, for example by peeling, after removal of the component from the mould assembly. Alternatively, the film, for example a plastics material such as a polyester or a polycarbonate sheet, can be incorporated into the component.
Preferably, the film can be provided with a chemical hard coat further to improve the scratch resistance of the component.
Such in-mould coating of components enables components to be made easily in the required shape with a high quality surface finish. If tinting of the components is required, the resin, or indeed the substrate where appropriate, can be combined with suitable tinting additives.
Claims (18)
- A method of producing a component comprises the steps of providing a mould having a cavity, heating the mould to a predetermined temperature, placing a glass filler material in the cavity, closing the mould, injecting a thermoplastic resin material into the cavity to fill the cavity and to impregnate the glass filler material, then cooling the mould, before opening the mould to remove the component, characterised in that prior to cooling the mould is maintained at the predetermined temperature for a time beyond that required to allow the cavity to be filled.
- 2. A-niethod according to claim 1, characterised in that the glass filler material is a fibrous glass mat.
- 3. A method of producing a coating on a plastic substrate, the coating and the substrate being formed by dual injection, comprises the steps of providing a thermoplastic resin material and a substrate material, providing a glass filler in the form of a fibrous glass mat, placing the mat in a mould, closing the mould and heating the mould to a predetermined temperature, dual injecting the thermoplastic resin and the substrate material into the mould to fin the cavity whereby the thermoplastic resin is injected into the mould ahead of the substrate material in order to impregnate the glass mat so that the resin impregnated glass mat forms the coating on the substrate, cooling the mould, characterised in that prior to cooling the mould is maintained at the predetermined temperature -for a time beyond that required to allow the cavity to be filled.
- A method of providing a coating on a plastic substrate, the coating and the substrate being formed by dual injection, comprises the steps of providing a thermoplastic resin material, mixing the thermoplastic resin with a glass filler material to form a mixture, heating a mould having a mould cavity to a predetermined temperature, dual injecting the mixture and the substrate material into the mould cavity to fill the mould cavity whereby the mixture is injected into the mould ahead of the substrate material in order to form the coating on the substrate, and cooling the mould characterised in that prior to cooling the mould is maintained at the predetermined temperature for a time beyond that required to allow the cavity to be fiRed.
- A method of providing a coating on a plastic substrate, the coating and the substrate being formed by dual injection, comprises the steps of providing a thermoplastic resin material, mixing the thermoplastic resin with a glass filler material to form a mixture, heating a mould having a mould cavity to a predetermined temperature, dual injecting the mixture and the coating material into the mould cavity to flE the mould cavity whereby the coating material is injected into the mould ahead of the mixture in order to form the coating on the substrate, and cooling the mould characterised in that prior to cooling the mould is maintained at the predetermined temperature for a time beyond that required to allow the cavity to be filled.
- 6. A method according to any previous claim, characterised in that the predetermined temperature is in the region of the melting temperature of the resin.
- 7. A method according to claim 6. characterised in that the resin is a polycarbonate and the predetermined temperature is in the region of 30WC.
- 8. A method according to claim 6, characterised in that the resin is a nylon and the predetermined temperature is in the region of 270T.
- 9. A method according to claim 6, characterised in that the resin is an acrylic and the predetermined temperature is in the region of 260-280T.
- 10. A method according to any previous claim, characterised in that the resin is a non-pigmented resin.
- 1. A method according to any previous claim, characterised in that the mould is provided on a least one surface with a film.
- 12. A method according to claim 11, characterised in that the film is incorporated into the component.
- 13. A method according to claim 11, characterised in that the film is removed from the component after the component has been removed from the mould.
- 14. A method according to claim 12 or claim 13, characterised in that the film comprises a plastics sheet. -
- 15. A method according to claim 12 or claim 13, characterised in that the ffim comprises a metal sheet.
- 16. A method of producing a component substantially as described herein with reference to and as iHustrated herein with reference to the accompanying drawings.
- 17. A component manufactured according to a method according to any preceding claim.
- 18. Use of the method of any of claims 1 to 16 in the manufacture of a component.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU42777/99A AU4277799A (en) | 1998-06-26 | 1999-06-07 | Improved polymer glazing system |
| PCT/GB1999/001792 WO2000000338A1 (en) | 1998-06-26 | 1999-06-07 | Improved polymer glazing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GBGB9813745.8A GB9813745D0 (en) | 1998-06-26 | 1998-06-26 | Improved polymer glazing system |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9825460D0 GB9825460D0 (en) | 1999-01-13 |
| GB2338675A true GB2338675A (en) | 1999-12-29 |
| GB2338675B GB2338675B (en) | 2003-02-12 |
Family
ID=10834382
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GBGB9813745.8A Ceased GB9813745D0 (en) | 1998-06-26 | 1998-06-26 | Improved polymer glazing system |
| GB9825460A Expired - Fee Related GB2338675B (en) | 1998-06-26 | 1998-11-23 | Improved polymer glazing system |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GBGB9813745.8A Ceased GB9813745D0 (en) | 1998-06-26 | 1998-06-26 | Improved polymer glazing system |
Country Status (1)
| Country | Link |
|---|---|
| GB (2) | GB9813745D0 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103507208A (en) * | 2012-06-18 | 2014-01-15 | 松下电器产业株式会社 | Injection molding method and injection molding device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1474148A (en) * | 1974-07-05 | 1977-05-18 | Matra Engins | Method of and machine for the production of mouldings containing a reinforcing filler |
| GB2259665A (en) * | 1991-09-17 | 1993-03-24 | Ford Motor Co | Moulding a reinforced plastics component |
| GB2298160A (en) * | 1993-11-11 | 1996-08-28 | Rover Group | A method of moulding and a moulding formed by such a method |
| GB2305890A (en) * | 1994-09-02 | 1997-04-23 | Rover Group | A method of producing a scratch resistant coating on a plastics substrate |
-
1998
- 1998-06-26 GB GBGB9813745.8A patent/GB9813745D0/en not_active Ceased
- 1998-11-23 GB GB9825460A patent/GB2338675B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1474148A (en) * | 1974-07-05 | 1977-05-18 | Matra Engins | Method of and machine for the production of mouldings containing a reinforcing filler |
| GB2259665A (en) * | 1991-09-17 | 1993-03-24 | Ford Motor Co | Moulding a reinforced plastics component |
| GB2298160A (en) * | 1993-11-11 | 1996-08-28 | Rover Group | A method of moulding and a moulding formed by such a method |
| GB2305890A (en) * | 1994-09-02 | 1997-04-23 | Rover Group | A method of producing a scratch resistant coating on a plastics substrate |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103507208A (en) * | 2012-06-18 | 2014-01-15 | 松下电器产业株式会社 | Injection molding method and injection molding device |
| CN103507208B (en) * | 2012-06-18 | 2016-01-20 | 松下知识产权经营株式会社 | Injection molding method and mold for injection molding device |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9825460D0 (en) | 1999-01-13 |
| GB9813745D0 (en) | 1998-08-26 |
| GB2338675B (en) | 2003-02-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20101123 |