CA1118977A - Method of manufacturing plastic articles - Google Patents
Method of manufacturing plastic articlesInfo
- Publication number
- CA1118977A CA1118977A CA000358610A CA358610A CA1118977A CA 1118977 A CA1118977 A CA 1118977A CA 000358610 A CA000358610 A CA 000358610A CA 358610 A CA358610 A CA 358610A CA 1118977 A CA1118977 A CA 1118977A
- Authority
- CA
- Canada
- Prior art keywords
- resin material
- thermoplastic resin
- container
- portions
- plastic
- 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.)
- Expired
Links
Landscapes
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A plastic container is made by separately molding of thermoplastic resin material at least two divided portions of the container, each molded portion being provided with a dividing end face and a cutout extending along the dividing end face. The molded portions are then held in a position of desired assembled relationship to provide a key-shaped jointing groove including the cutouts extending between the opposed dividing end faces and having an opening extending around the whole periphery of the container. The key-shaped jointing groove is filled by injecting through the opening a thermo-plastic resin material which is heated to such a temperature that the thermoplastic resin material is in plastic form and heats, melts and fuses the thermoplastic resin material of the divided portions at the surfaces of the jointing groove which are contacted by the molten thermoplastic resin material. The thermoplastic resin material in the groove and fused thereby is cooled to effect hardening and to unite the molded portions into one body.
A plastic container is made by separately molding of thermoplastic resin material at least two divided portions of the container, each molded portion being provided with a dividing end face and a cutout extending along the dividing end face. The molded portions are then held in a position of desired assembled relationship to provide a key-shaped jointing groove including the cutouts extending between the opposed dividing end faces and having an opening extending around the whole periphery of the container. The key-shaped jointing groove is filled by injecting through the opening a thermo-plastic resin material which is heated to such a temperature that the thermoplastic resin material is in plastic form and heats, melts and fuses the thermoplastic resin material of the divided portions at the surfaces of the jointing groove which are contacted by the molten thermoplastic resin material. The thermoplastic resin material in the groove and fused thereby is cooled to effect hardening and to unite the molded portions into one body.
Description
The present invention relates to the manufacture of hollow plastic containers such as shaped holJow plastic containers having a complicated inner and/or out:er shape, Hollow plastic containers such as gasoline tanks and air cleaner casings for use in automobiles usua:lly have rein-forcing ribs, ridges or grooves formed in a inner surface, so that such containers cannot be molded as a hollow one-piece article, Such hollow plastic containers ]have usually been manufactured by molding separate portions by a molding process such as compression moldingl cast molding, injection molding or extrusion molding. Such molded portions are mechanically fastened together by jointing or clamping at flange portions with gaskets interposed therebetween to pro-vide a desired hollow container. ~;
Although a hollow container~consisting of two ormore separately molded portions fastened together by means of mechanical joints has the advantage that the molded portions can be disassembled from each other, t],lere is the disadvantage that the joint may be loosened by vibration while the container is in use with resultant leakage or other faults, It is also well known to bond the molded portions by use of adhesive, but it is difficult to provide a high bond strength sufficient to resist any destructive shock or the like, and the use of adhesive is inadequate for containers receiving a solution or liquid which is a solvent for the adhesive~
It is therefore an object of the present invention to provide a method of making a hollow plastic container which overcomes these disadvantages.
According to the invention, a method of manufacturing a plastic article comprises the steps of molding separately of thermoplastic resin material at least two divided portions of said container, said molded portions each being provided with a dividing end face and a cutout extending along the dividing end face thereof, holding said molded portions in a position of desired assembled relationship to provide a key-shaped jointing groove including said cutouts extending between the opposed dividing end faces and having an opening extending around the 10 whole periphery of the container, filling said key-shaped -~
jointing groove by injecting through said opening a thermo-plastic resin material which is heated to such a temperature that said thermoplastic resin material is in plastic form and heats, melts and fuses the thermoplastic resin material of said divided portions at the surfaces of said jointing groove which are contacted by the molten thermoplastic resin material, and cooling said thermoplastic resin material in said groove and fused thereby to effect hardening thereof and to uni~ said -molded portions into one body.
One embodiment of the invention will now be descxibed by way of example, with reference to the accompanying drawing, which shows a vertical sectional view of an air cleaner casing.
Referring to the drawing, an air cleaner casing 1 comprises two molded portions 2, 3 which are separately molded by conventional molding process and which are made of poly-ethylene.
The molded portions 2, 3 are provided at dividing - ~
stepped end faces 4 and 5 thereof with grooves 7, 7 and cutouts ~`
8, 8 at the corresponding zones so as to prov:ide a substantially key-shaped jointing groove 7, 8 extending around the outer ,~ ~
periphery of the article and open to the outside at an outer peripheral openi.ng 9 when the molded portions 2 and 3 are assembled by abutting the dividing end faces 4 and 5 with each other.
The assembled molded portions 2 and 3 are inserted into a metal mold (not shown) and then heated. Plasticized polyethylene from an injection molding machine or extruding machine (not shown) connected to the metal mold is injected or forced into the jointing groove 7, 8 through a duct (not shown) in the metal mold and through the opening 9 open at the outer periphery 6 of the molded portions 2, 3. The injected polyethylene is cooled and hardened in the jointing groove to provide a molded joint portion 10 therein.
The injected or extruded plastic material may be plasticized by heat to a temperature sufficient to melt the plastic material of the molded portions 2 and 3 when they are contacted to each other so that it fuses the plastic material of the molded portions 2 and 3 at their contact surfaces, and upon cooling and hardening provides a molded joint portion 10 20 which is united with the molded portions 2 and 3 and thereby connects the molded portions riyidly and provide an airtight seal between the abutting end faces 4 and 5.
;As will be apparent from the foregoi.ng, the present invention is capable of providing a hollow p].astic container of relatively light weight and high strength. The invention is also capable of providing an airtight hol].ow plastic container, and therefore can be utilized for producing articles such as floats of fishing nets or capsules for accommodating instruments therein.
, .
Although a hollow container~consisting of two ormore separately molded portions fastened together by means of mechanical joints has the advantage that the molded portions can be disassembled from each other, t],lere is the disadvantage that the joint may be loosened by vibration while the container is in use with resultant leakage or other faults, It is also well known to bond the molded portions by use of adhesive, but it is difficult to provide a high bond strength sufficient to resist any destructive shock or the like, and the use of adhesive is inadequate for containers receiving a solution or liquid which is a solvent for the adhesive~
It is therefore an object of the present invention to provide a method of making a hollow plastic container which overcomes these disadvantages.
According to the invention, a method of manufacturing a plastic article comprises the steps of molding separately of thermoplastic resin material at least two divided portions of said container, said molded portions each being provided with a dividing end face and a cutout extending along the dividing end face thereof, holding said molded portions in a position of desired assembled relationship to provide a key-shaped jointing groove including said cutouts extending between the opposed dividing end faces and having an opening extending around the 10 whole periphery of the container, filling said key-shaped -~
jointing groove by injecting through said opening a thermo-plastic resin material which is heated to such a temperature that said thermoplastic resin material is in plastic form and heats, melts and fuses the thermoplastic resin material of said divided portions at the surfaces of said jointing groove which are contacted by the molten thermoplastic resin material, and cooling said thermoplastic resin material in said groove and fused thereby to effect hardening thereof and to uni~ said -molded portions into one body.
One embodiment of the invention will now be descxibed by way of example, with reference to the accompanying drawing, which shows a vertical sectional view of an air cleaner casing.
Referring to the drawing, an air cleaner casing 1 comprises two molded portions 2, 3 which are separately molded by conventional molding process and which are made of poly-ethylene.
The molded portions 2, 3 are provided at dividing - ~
stepped end faces 4 and 5 thereof with grooves 7, 7 and cutouts ~`
8, 8 at the corresponding zones so as to prov:ide a substantially key-shaped jointing groove 7, 8 extending around the outer ,~ ~
periphery of the article and open to the outside at an outer peripheral openi.ng 9 when the molded portions 2 and 3 are assembled by abutting the dividing end faces 4 and 5 with each other.
The assembled molded portions 2 and 3 are inserted into a metal mold (not shown) and then heated. Plasticized polyethylene from an injection molding machine or extruding machine (not shown) connected to the metal mold is injected or forced into the jointing groove 7, 8 through a duct (not shown) in the metal mold and through the opening 9 open at the outer periphery 6 of the molded portions 2, 3. The injected polyethylene is cooled and hardened in the jointing groove to provide a molded joint portion 10 therein.
The injected or extruded plastic material may be plasticized by heat to a temperature sufficient to melt the plastic material of the molded portions 2 and 3 when they are contacted to each other so that it fuses the plastic material of the molded portions 2 and 3 at their contact surfaces, and upon cooling and hardening provides a molded joint portion 10 20 which is united with the molded portions 2 and 3 and thereby connects the molded portions riyidly and provide an airtight seal between the abutting end faces 4 and 5.
;As will be apparent from the foregoi.ng, the present invention is capable of providing a hollow p].astic container of relatively light weight and high strength. The invention is also capable of providing an airtight hol].ow plastic container, and therefore can be utilized for producing articles such as floats of fishing nets or capsules for accommodating instruments therein.
, .
Claims
1. A method of manufacturing a plastic container com-prising the steps of molding separately of thermoplastic resin material at least two divided portions of said container, said molded portions each being provided with a dividing end face and a cutout extending along the dividing end face thereof, holding said molded portions in a position of desired assembled relationship to provide a key-shaped jointing groove including said cutouts extending between the opposed dividing end faces and having an opening extending around the whole periphery of the container, filling said key-shaped jointing groove by injecting through said opening a thermoplastic resin material which is heated to such a temperature that said thermoplastic resin material is in plastic form and heats t melts and fuses the thermoplastic resin material of said divided portions at the surfaces of said jointing groove which are contacted by the molten thermoplastic resin material, and cooling said thermo-plastic resin material in said groove and fused thereby to effect hardening thereof and to unite said molded portions into one body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000358610A CA1118977A (en) | 1975-05-12 | 1980-08-19 | Method of manufacturing plastic articles |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50055691A JPS51135978A (en) | 1975-05-12 | 1975-05-12 | Synthetic resin moldings and method of producing same |
| JP55,691/75 | 1975-05-12 | ||
| CA251,917A CA1090973A (en) | 1975-05-12 | 1976-05-06 | Plastic articles and method for manufacturing thereof |
| CA000358610A CA1118977A (en) | 1975-05-12 | 1980-08-19 | Method of manufacturing plastic articles |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1118977A true CA1118977A (en) | 1982-03-02 |
Family
ID=27164458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000358610A Expired CA1118977A (en) | 1975-05-12 | 1980-08-19 | Method of manufacturing plastic articles |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1118977A (en) |
-
1980
- 1980-08-19 CA CA000358610A patent/CA1118977A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |