CA2392822A1 - Process for over-moulding non-thermoplastic parts - Google Patents
Process for over-moulding non-thermoplastic parts Download PDFInfo
- Publication number
- CA2392822A1 CA2392822A1 CA002392822A CA2392822A CA2392822A1 CA 2392822 A1 CA2392822 A1 CA 2392822A1 CA 002392822 A CA002392822 A CA 002392822A CA 2392822 A CA2392822 A CA 2392822A CA 2392822 A1 CA2392822 A1 CA 2392822A1
- Authority
- CA
- Canada
- Prior art keywords
- over
- thermoplastic
- molding
- fusion
- thermoplastic parts
- 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.)
- Abandoned
Links
- 229920001169 thermoplastic Polymers 0.000 title description 21
- 239000004416 thermosoftening plastic Substances 0.000 title description 19
- 238000000465 moulding Methods 0.000 title description 11
- 238000000034 method Methods 0.000 title description 7
- 230000004927 fusion Effects 0.000 description 9
- 239000007787 solid Substances 0.000 description 8
- 239000004033 plastic Substances 0.000 description 5
- 229920003023 plastic Polymers 0.000 description 5
- 229920000642 polymer Polymers 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 229920001187 thermosetting polymer Polymers 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000012815 thermoplastic material 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
- B29C45/14—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
- B29C45/14311—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 using means for bonding the coating to the 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
- B29C45/14311—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 using means for bonding the coating to the articles
- B29C2045/14319—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 using means for bonding the coating to the articles bonding by a fusion bond
-
- 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
-
- 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
- B29K2101/00—Use of unspecified macromolecular compounds as moulding material
- B29K2101/10—Thermosetting resins
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Brushes (AREA)
Description
PROCESS FOR OVER-MOULDING NON-THERMOPLASTIC PARTS
Over-molding is a technique widely used in the plastic industry. It consists of injecting a plastic over another one to create a homogeneous part from two plastics. To fully understand the process, one must know the difference between a thermoplastic and a thermoset polymer. A thermoplastic is a polymer that will melt when heated and solidify once cooled down. This solide-liquide-solide cycle can be repeated as desired. This type of polymer is the most widely used in the plastic industry. For example, it can be heated up to its liquid state and injected into a closed mold, then cooled down to its solid state and removed from the mold to obtain the desired part.
A thermoset polymer starts of as a liquid and can be solidified via an irreversible chemical reaction. If this resulting solid part is heated, it will remain solid and will burn instead of melt.
To be successful at over-molding, one must uses thermoplastics. First, a part is created from a conventional injection process, for example a toothbrush handle.
This first part is then placed into a different mold in which the second thermoplastic is injected. When the second thermoplastic is injected, it is very hot permitting it to be in the liquid state. When it comes in contact with the first part, which is solid, the heat from the injected polymer will melt a small film of the solid thermoplastic polymer (inserted part), allowing both of the liquids to blend together. When cooled down, these two plastics will solidify as one homogeneous part. This is how the soft rubber like part of a toothbrush handle is applied.
Therefore over-molding needs the inserted part to be a thermoplastic to allow fusion of the polymers. One can also achieved over-molding onto non-thermoplastic materials. However, no fusion will occur on the inserted part so the adhesion between the parts will be mechanical and very limited. For example, one can over-mold onto metal but that bond would be relatively weak. The same would apply when over molding onto a solid thermoset part. The bonds created
Over-molding is a technique widely used in the plastic industry. It consists of injecting a plastic over another one to create a homogeneous part from two plastics. To fully understand the process, one must know the difference between a thermoplastic and a thermoset polymer. A thermoplastic is a polymer that will melt when heated and solidify once cooled down. This solide-liquide-solide cycle can be repeated as desired. This type of polymer is the most widely used in the plastic industry. For example, it can be heated up to its liquid state and injected into a closed mold, then cooled down to its solid state and removed from the mold to obtain the desired part.
A thermoset polymer starts of as a liquid and can be solidified via an irreversible chemical reaction. If this resulting solid part is heated, it will remain solid and will burn instead of melt.
To be successful at over-molding, one must uses thermoplastics. First, a part is created from a conventional injection process, for example a toothbrush handle.
This first part is then placed into a different mold in which the second thermoplastic is injected. When the second thermoplastic is injected, it is very hot permitting it to be in the liquid state. When it comes in contact with the first part, which is solid, the heat from the injected polymer will melt a small film of the solid thermoplastic polymer (inserted part), allowing both of the liquids to blend together. When cooled down, these two plastics will solidify as one homogeneous part. This is how the soft rubber like part of a toothbrush handle is applied.
Therefore over-molding needs the inserted part to be a thermoplastic to allow fusion of the polymers. One can also achieved over-molding onto non-thermoplastic materials. However, no fusion will occur on the inserted part so the adhesion between the parts will be mechanical and very limited. For example, one can over-mold onto metal but that bond would be relatively weak. The same would apply when over molding onto a solid thermoset part. The bonds created
2 when over-molding onto a non-thermoplastic part, where no fusion can occur, are generally mechanical and are relatively weak when compared to an over-molded part where fusion has occurred.
This present invention is aimed at providing a process that can allow fusion of an inserted non-thermoplastic part in an over-molding manufacturing process between, for example, thermoplastic and thermoset polymers The process consists of applying a "union ~Im" to the solid non-thermoplastic part prior to over-molding. The union film must have properties such as being chemically compatible to the non-thermoplastic part and retain thermoplastic properties to allow fusion while over-molding. The then modified non-thermoplastic part is inserted into the mold in such a fashion that the injected polymer will make direct contact with the union film allowing fusion during the injection. Therefore, in the resulting part, the union film will be sandwiched between the non-thermoplastic part and the injected thermoplastic part. Since the union film has thermoplastic properties, fusion will occur. Allowing fusion to occur during the injection of the thermoplastic polymer is the key to creating a very solid bond while over-molding onto a non-thermoplastic part.
This present invention is aimed at providing a process that can allow fusion of an inserted non-thermoplastic part in an over-molding manufacturing process between, for example, thermoplastic and thermoset polymers The process consists of applying a "union ~Im" to the solid non-thermoplastic part prior to over-molding. The union film must have properties such as being chemically compatible to the non-thermoplastic part and retain thermoplastic properties to allow fusion while over-molding. The then modified non-thermoplastic part is inserted into the mold in such a fashion that the injected polymer will make direct contact with the union film allowing fusion during the injection. Therefore, in the resulting part, the union film will be sandwiched between the non-thermoplastic part and the injected thermoplastic part. Since the union film has thermoplastic properties, fusion will occur. Allowing fusion to occur during the injection of the thermoplastic polymer is the key to creating a very solid bond while over-molding onto a non-thermoplastic part.
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002392822A CA2392822A1 (en) | 2002-07-09 | 2002-07-09 | Process for over-moulding non-thermoplastic parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002392822A CA2392822A1 (en) | 2002-07-09 | 2002-07-09 | Process for over-moulding non-thermoplastic parts |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2392822A1 true CA2392822A1 (en) | 2004-01-09 |
Family
ID=30449976
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002392822A Abandoned CA2392822A1 (en) | 2002-07-09 | 2002-07-09 | Process for over-moulding non-thermoplastic parts |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2392822A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019048592A1 (en) * | 2017-09-07 | 2019-03-14 | Nolax Ag | Device for hot gas welding, method for producing a hybrid component, and use of an application unit |
-
2002
- 2002-07-09 CA CA002392822A patent/CA2392822A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019048592A1 (en) * | 2017-09-07 | 2019-03-14 | Nolax Ag | Device for hot gas welding, method for producing a hybrid component, and use of an application unit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued | ||
| FZDE | Discontinued |
Effective date: 20041012 |