CA1152712A - Integral hinged single wall blow molded container - Google Patents
Integral hinged single wall blow molded containerInfo
- Publication number
- CA1152712A CA1152712A CA000370783A CA370783A CA1152712A CA 1152712 A CA1152712 A CA 1152712A CA 000370783 A CA000370783 A CA 000370783A CA 370783 A CA370783 A CA 370783A CA 1152712 A CA1152712 A CA 1152712A
- Authority
- CA
- Canada
- Prior art keywords
- hinge
- parison
- mold
- area
- forming area
- 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
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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/48—Moulds
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D43/00—Lids or covers for rigid or semi-rigid containers
- B65D43/14—Non-removable lids or covers
- B65D43/16—Non-removable lids or covers hinged for upward or downward movement
- B65D43/162—Non-removable lids or covers hinged for upward or downward movement the container, the lid and the hinge being made of one piece
-
- 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
- B29L2031/712—Containers; Packaging elements or accessories, Packages
- B29L2031/7162—Boxes, cartons, cases
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
INTEGRAL HINGED SINGLE WALL BLOW MOLDED CONTAINER
Abstract of the Disclosure An integral hinged blow molded container having a single wall is produced by inflating a parison within a mold having a hinge forming area with a draw ratio of greater than 1 whereby the parison is reduced in thickness within the hinge forming area relative to the adjacent area. The thus formed parison is severed about a circumference adjacent the formed hinge to create a top portion and a bottom portion openable and closable about the hinge.
Abstract of the Disclosure An integral hinged blow molded container having a single wall is produced by inflating a parison within a mold having a hinge forming area with a draw ratio of greater than 1 whereby the parison is reduced in thickness within the hinge forming area relative to the adjacent area. The thus formed parison is severed about a circumference adjacent the formed hinge to create a top portion and a bottom portion openable and closable about the hinge.
Description
~L1 5~2~71 2 Background of the Invention This invention relates generally to the art of blow molded containers and the molding thereof and more particularly to the art of forming a single-walled blow molded container having an integral hinge portion.
Single-walled thermoplastic containers have been produced in the prior art by utilizing injection molding techniques. Mb~ or injection molding processes are considerably more expensive and complex than molds utilized for blow molding since a mold surface is required for every surface of the resulting injection molded article. An example of such prior art injection molding is described in U. S. Patent No.
Single-walled thermoplastic containers have been produced in the prior art by utilizing injection molding techniques. Mb~ or injection molding processes are considerably more expensive and complex than molds utilized for blow molding since a mold surface is required for every surface of the resulting injection molded article. An example of such prior art injection molding is described in U. S. Patent No.
2,687,157 to Cowan.
U. S. Patent ~o. 3,i95,2~5 to Schurman et al describes a process of producing a double-walled container having an integral hinge.
In an aspect of the invention disclosed therein, there is provided a container having a body part and a cover part joined by a hinge continuous with each of them and connecting them for opening and closing the container.
The body part, cover part and hinge are formed from a single plastic tubular member. The hinge is a pressed and fused laminate of two webs formed from opposite sides of the tubular member. The hinge is thinner than the adjacent wall area of the body part and the cover part, as a result of the pressing and the pinching of the hinge during its formation.
The method described by Schurman et al involves the use of an unrestrained parison and a mold having male mold parts that make a substant~al entry into the mat;ng female mold parts. The method includes extruding the parison, positioning the unrestrained parison in the mold, closing the mold on the parison until the male mold parts project substantially into the mating female mold parts deforming the parison between them into the general configuration of the finished molded parts and inserting a blow needle through the wall of the parison and expanding the parison ' ~152712 by providing a pressure differential between the inside and the outside of the parison by blowing a pressurized fluid into the interior of the parison thus forcing the parison into the detailed configuration of the closed mold.
The two mold cavities are joined by land surfaces that register in closely spaced opposed relation when the mold is closed. The parison is closed at opposite ends and pinched upon itself intermediate its ends, upon the closing of the mold, and compression molded at its intermediate pinched area between the land surfaces to form a hinge separating the parison into a pair of hollow compartments.
While the product described in the above referenced United States patent provides an excellent double-walled con-tainer with an integral hinge, it is not always necessary for a container to have the double-wall construction described therein.
Summary of the Invention _ It is thus an ob~ect of this invention to provide a method and a mold for producing a single-walled blow molded container having a top portion and a bottom portion connected by an integral hinge portion.
The invention provides a hlow mold comprising:
a first mating half; and a second mating half comprising a hinge forming area located on an internal surface of said second half;
wherein said hinge forming area consists of an indentation having a depth of draw and a suspended width, and said depth of draw is greater than said suspended width.
From another aspect, the invention provides a process for forming a blow molded single-walled container having an integral hinge, comprising the steps of:
inflating a parison within a mold, said mold having in the area thereof forming the hinge area a geometry to create a
U. S. Patent ~o. 3,i95,2~5 to Schurman et al describes a process of producing a double-walled container having an integral hinge.
In an aspect of the invention disclosed therein, there is provided a container having a body part and a cover part joined by a hinge continuous with each of them and connecting them for opening and closing the container.
The body part, cover part and hinge are formed from a single plastic tubular member. The hinge is a pressed and fused laminate of two webs formed from opposite sides of the tubular member. The hinge is thinner than the adjacent wall area of the body part and the cover part, as a result of the pressing and the pinching of the hinge during its formation.
The method described by Schurman et al involves the use of an unrestrained parison and a mold having male mold parts that make a substant~al entry into the mat;ng female mold parts. The method includes extruding the parison, positioning the unrestrained parison in the mold, closing the mold on the parison until the male mold parts project substantially into the mating female mold parts deforming the parison between them into the general configuration of the finished molded parts and inserting a blow needle through the wall of the parison and expanding the parison ' ~152712 by providing a pressure differential between the inside and the outside of the parison by blowing a pressurized fluid into the interior of the parison thus forcing the parison into the detailed configuration of the closed mold.
The two mold cavities are joined by land surfaces that register in closely spaced opposed relation when the mold is closed. The parison is closed at opposite ends and pinched upon itself intermediate its ends, upon the closing of the mold, and compression molded at its intermediate pinched area between the land surfaces to form a hinge separating the parison into a pair of hollow compartments.
While the product described in the above referenced United States patent provides an excellent double-walled con-tainer with an integral hinge, it is not always necessary for a container to have the double-wall construction described therein.
Summary of the Invention _ It is thus an ob~ect of this invention to provide a method and a mold for producing a single-walled blow molded container having a top portion and a bottom portion connected by an integral hinge portion.
The invention provides a hlow mold comprising:
a first mating half; and a second mating half comprising a hinge forming area located on an internal surface of said second half;
wherein said hinge forming area consists of an indentation having a depth of draw and a suspended width, and said depth of draw is greater than said suspended width.
From another aspect, the invention provides a process for forming a blow molded single-walled container having an integral hinge, comprising the steps of:
inflating a parison within a mold, said mold having in the area thereof forming the hinge area a geometry to create a
-3-115;27~2 draw ratio of greater than 1 whereby the thickness of hinge portion is of lesser thickness than the adjacent sections of the parison;
removing the thus blow molded parison from the mold;
and severing a contiguous circumference thereof in areas adjacent but other than the hinge portion so as to form a top section and a bottom section connected by said hinge portion.
- The parison is severed along the circumference coin-cidental with the hinge area to form top and bottom sections connected by the hinge section.
Br_ef Description of the Drawing Figure 1 is an isometric view of a container in accordance with this invention in the closed position.
Figure 2 is an isometric view of the container of Figure 1 in a partially open position.
Figure 3 is a section view of a blow mold in accordance with this invention.
Figure 4 is a view of the blow mold of Figure 3 in the closed position.
Figure 5 is a view along the line 5-5 of Figure 4.
Figure 6 is a blow up of the hinge forming section of a mold in accordance with this invention.
Detailed Description In accordance with this invention, it has been found that a single-walled blow molded container having an integral hinge may be formed by deep drawing a hinge portion during the blow molding process. The molded parison with the deep drawn hinge portion is severed along a circumference contiguous with the hinge portion whereby the container is openable and closable about the hinge area. Further and more particular description will be given with xeference to the various figures of drawing.
Q~,J~, - 4-,.
.
A container 1, in accordance with this invention, is shown in an isometric view within Figure 1 of the drawing. The container comprises a bottom section 3, a top section ~ and a hinge portion 7. While this description is given utilizing as points of reference the top section and bottom section, it is understood that these descriptive term6 are for the purpose of reference only and relate only to the normal orientation of the container and are not necessarily limited to a particular orientation wherein the bottom section is of lower elevation than the top sectiDn.
Figure 2 of the drawing shows the container 1 in a partially open mode. It is seen from this view that the container is of a totally unitary construction, being made of but a single section of thermoplastic material with the top sect;on 5, bottom section 3 and hinge portion 7 all integrally joined into but a single container. The process of manufacturing the case or container, in accordance with this invention, will be given in the remaining description.
A cross section of a blow mold, in accordance with this invention,-~s ~llustrated in Figure 3 of the drawings. Shown in Figure 3 is a blow mold 9 in the open position and comprising mating halves 11 and 13.
Suspended between the mating halves 11 and 13 is a parison 14 . It is seen that when the mold sections 11 and 13 are in their mated position, they define a cavity into which the parison 14 is inflated. While the parison 14 is shown as a closed tubular form in Figure 3, it is understood that the initial start-up fonm would be an open tubular form which would then be pinched closed by the closing of the mold sections 11 and 13.
The parison 14 originates from a conventional extrusion source (not shown).
Any blow moldable thermoplastic material having the requisite flexibility for the hinge may be utilized. Such materials include high density polyethylene, polypropylene, polyvinyl chloride and elastomeric polyolefins. The extrusion die may be programmed so as to-vary the wall thickness of various portions of the parison so as to minimize any effects of sagging. Such techniques are well known in the art.
/
Figure 3 illustrates the hinge forming area 15 which may be seen with a greater degree of clarity in Figures 5 and 6. Figure 4 of the drawing shDws the mold sections in the closed position with the parison having been inflated so as to conform to the geometry of the mold. The inflated parison is generally designated by the numeral 17.
The inflation step is carried out by the use of needle 19 which communicates with a source of pressurizing fluid. Such inflation techniques are well known in the art.
The hinge forming area is.best seen in Figure 5 which shows the hinge forming area as a notch.or v-shaped.portion as indicated at 15. It is seen that, upon inflation of the.parison, the parison conforms to wall 21 and then into the notched hinge forming area 15. It is understood that the thermoplastic material which passes.the wall 21 and proceeds into the notched area 15 will of..necessity.be of thinner construction than-the thenmoplastic material which rests against wall.21 due to the section of material conformlng to a larger area than that material which conforms to.the vertical wall.21.- .
In accordance with this invention, it has been found that by significantly stretching and deep drawing the thermoplastic material into a hinge forming area, the thinning and stretching caused by such deep drawing produces a thinned hinge area which.is.both oriented and of significantly greater flexib.ility than the adjacent areas.- Figure 5 of the drawing illustrates.a vent 23 which aids the:deep drawing of the thermoplastic material.by permitting any entrapped gases to escape during the deep drawing of the hinge area. The vent 23 may optionally be vacuum assisted.so.as.to further aid in the stretching and deep drawing of the hinge area. Figure 6 of the drawing shows an enlarged view of the hinge formi;ng area 15 illustrated..in Figure 5. This view is for the purpose of describing a critical feature of this inventior ~n that.the depth of draw to the suspended length ratio must be greater than 1 in order to produce an effective hinge. The depth of draw is 1~5271Z
'.esignate~ by the letter "D" in Figure 6 while the suspended length dimension is designated by the letter "S". It is critical that the ratio D/S be at least 1 ~r greater. If the ratio D/S is susbstantially less than l, the hinge does not possess the re~uired strength or flexibility to function as.a hinge for practical purposes. The.parameter S/D is frequently referred to in the art as the draw ratio. The art also frequently refers to the draw ratio.being the final area divided by the initial area.of thermoplastic material. If.the latter ratio is utilized, the critical draw ratio utilizing areas is then ~5 for.~the particular geometry illustrated in the drawings.
Once having inflated the parison to the geometry of the mold including the hinge.forming area, the resulting closed configuration is severed about a circumference contiguous with the hinge portion 7 as shown in Figure 2; The circumference contiguous with the:hinge portion is designated by the numeral 25 in.Figures 1 and 2. The process of severing ls carried out by conventional techniques such is placing the container in a cradle and sawing along a defined path so as to mate the severance line with the hinge portion 7.
While the hinge forming area 15 of~the mold is shown as being of basically triangular cross section, it is understood that the shape of the hinge may be any desired shape. For example, the hinge forming area may be rectangular or generally circular.in cross section. The only critical feature is that the draw ratio (depth of draw to suspended length) be 1 or greater.
The container and molds illustrated in the various figures of drawings illustrate a hinge forming.area 15 which is parallel to the direction of parison drop and on a mold wall adjacent the wall having a parting line. The parting line of the mold shown in Figures 4 and 5 is illustrated in Figures l.and 2 by the designation of PL in the dashed line associated therewith. The hinge fonming area, however, may be on llS271Z
~,y convenient wall and if on a wall which defines the parting line, the hinge forming area is preferrably coincidental with the parting line.
If the hinge forming area is desired to be on the wall containing the parting line and does not lie coincidental with the parting line, special mold construction is necessitated so as to make it possible to remove the molded article from the mold.
An advantageous feature of the single-walled blow molded container of this invention is that either or both the top and bottom sections may be conformed to the geometry o~ an article which it is intended to house. Such conformity would appear on the interior and the exterior of the container so as to make the geonetry of the housed article readily apparent.
lt is thus seen that by this invent;on a novel single-walled blow molded container having a deep drawn integral hinge is provided. It is further seen that the process of this invention, in conjunction with the unigue blow mold of this invention, makes it possible to provide such a container. As many variations will be apparent to those of skill in the art from a reading of the above specification, which is exemplary in nature, the spirit and scope of the present invention is set forth only by the breadth of the following appended claims.
.
removing the thus blow molded parison from the mold;
and severing a contiguous circumference thereof in areas adjacent but other than the hinge portion so as to form a top section and a bottom section connected by said hinge portion.
- The parison is severed along the circumference coin-cidental with the hinge area to form top and bottom sections connected by the hinge section.
Br_ef Description of the Drawing Figure 1 is an isometric view of a container in accordance with this invention in the closed position.
Figure 2 is an isometric view of the container of Figure 1 in a partially open position.
Figure 3 is a section view of a blow mold in accordance with this invention.
Figure 4 is a view of the blow mold of Figure 3 in the closed position.
Figure 5 is a view along the line 5-5 of Figure 4.
Figure 6 is a blow up of the hinge forming section of a mold in accordance with this invention.
Detailed Description In accordance with this invention, it has been found that a single-walled blow molded container having an integral hinge may be formed by deep drawing a hinge portion during the blow molding process. The molded parison with the deep drawn hinge portion is severed along a circumference contiguous with the hinge portion whereby the container is openable and closable about the hinge area. Further and more particular description will be given with xeference to the various figures of drawing.
Q~,J~, - 4-,.
.
A container 1, in accordance with this invention, is shown in an isometric view within Figure 1 of the drawing. The container comprises a bottom section 3, a top section ~ and a hinge portion 7. While this description is given utilizing as points of reference the top section and bottom section, it is understood that these descriptive term6 are for the purpose of reference only and relate only to the normal orientation of the container and are not necessarily limited to a particular orientation wherein the bottom section is of lower elevation than the top sectiDn.
Figure 2 of the drawing shows the container 1 in a partially open mode. It is seen from this view that the container is of a totally unitary construction, being made of but a single section of thermoplastic material with the top sect;on 5, bottom section 3 and hinge portion 7 all integrally joined into but a single container. The process of manufacturing the case or container, in accordance with this invention, will be given in the remaining description.
A cross section of a blow mold, in accordance with this invention,-~s ~llustrated in Figure 3 of the drawings. Shown in Figure 3 is a blow mold 9 in the open position and comprising mating halves 11 and 13.
Suspended between the mating halves 11 and 13 is a parison 14 . It is seen that when the mold sections 11 and 13 are in their mated position, they define a cavity into which the parison 14 is inflated. While the parison 14 is shown as a closed tubular form in Figure 3, it is understood that the initial start-up fonm would be an open tubular form which would then be pinched closed by the closing of the mold sections 11 and 13.
The parison 14 originates from a conventional extrusion source (not shown).
Any blow moldable thermoplastic material having the requisite flexibility for the hinge may be utilized. Such materials include high density polyethylene, polypropylene, polyvinyl chloride and elastomeric polyolefins. The extrusion die may be programmed so as to-vary the wall thickness of various portions of the parison so as to minimize any effects of sagging. Such techniques are well known in the art.
/
Figure 3 illustrates the hinge forming area 15 which may be seen with a greater degree of clarity in Figures 5 and 6. Figure 4 of the drawing shDws the mold sections in the closed position with the parison having been inflated so as to conform to the geometry of the mold. The inflated parison is generally designated by the numeral 17.
The inflation step is carried out by the use of needle 19 which communicates with a source of pressurizing fluid. Such inflation techniques are well known in the art.
The hinge forming area is.best seen in Figure 5 which shows the hinge forming area as a notch.or v-shaped.portion as indicated at 15. It is seen that, upon inflation of the.parison, the parison conforms to wall 21 and then into the notched hinge forming area 15. It is understood that the thermoplastic material which passes.the wall 21 and proceeds into the notched area 15 will of..necessity.be of thinner construction than-the thenmoplastic material which rests against wall.21 due to the section of material conformlng to a larger area than that material which conforms to.the vertical wall.21.- .
In accordance with this invention, it has been found that by significantly stretching and deep drawing the thermoplastic material into a hinge forming area, the thinning and stretching caused by such deep drawing produces a thinned hinge area which.is.both oriented and of significantly greater flexib.ility than the adjacent areas.- Figure 5 of the drawing illustrates.a vent 23 which aids the:deep drawing of the thermoplastic material.by permitting any entrapped gases to escape during the deep drawing of the hinge area. The vent 23 may optionally be vacuum assisted.so.as.to further aid in the stretching and deep drawing of the hinge area. Figure 6 of the drawing shows an enlarged view of the hinge formi;ng area 15 illustrated..in Figure 5. This view is for the purpose of describing a critical feature of this inventior ~n that.the depth of draw to the suspended length ratio must be greater than 1 in order to produce an effective hinge. The depth of draw is 1~5271Z
'.esignate~ by the letter "D" in Figure 6 while the suspended length dimension is designated by the letter "S". It is critical that the ratio D/S be at least 1 ~r greater. If the ratio D/S is susbstantially less than l, the hinge does not possess the re~uired strength or flexibility to function as.a hinge for practical purposes. The.parameter S/D is frequently referred to in the art as the draw ratio. The art also frequently refers to the draw ratio.being the final area divided by the initial area.of thermoplastic material. If.the latter ratio is utilized, the critical draw ratio utilizing areas is then ~5 for.~the particular geometry illustrated in the drawings.
Once having inflated the parison to the geometry of the mold including the hinge.forming area, the resulting closed configuration is severed about a circumference contiguous with the hinge portion 7 as shown in Figure 2; The circumference contiguous with the:hinge portion is designated by the numeral 25 in.Figures 1 and 2. The process of severing ls carried out by conventional techniques such is placing the container in a cradle and sawing along a defined path so as to mate the severance line with the hinge portion 7.
While the hinge forming area 15 of~the mold is shown as being of basically triangular cross section, it is understood that the shape of the hinge may be any desired shape. For example, the hinge forming area may be rectangular or generally circular.in cross section. The only critical feature is that the draw ratio (depth of draw to suspended length) be 1 or greater.
The container and molds illustrated in the various figures of drawings illustrate a hinge forming.area 15 which is parallel to the direction of parison drop and on a mold wall adjacent the wall having a parting line. The parting line of the mold shown in Figures 4 and 5 is illustrated in Figures l.and 2 by the designation of PL in the dashed line associated therewith. The hinge fonming area, however, may be on llS271Z
~,y convenient wall and if on a wall which defines the parting line, the hinge forming area is preferrably coincidental with the parting line.
If the hinge forming area is desired to be on the wall containing the parting line and does not lie coincidental with the parting line, special mold construction is necessitated so as to make it possible to remove the molded article from the mold.
An advantageous feature of the single-walled blow molded container of this invention is that either or both the top and bottom sections may be conformed to the geometry o~ an article which it is intended to house. Such conformity would appear on the interior and the exterior of the container so as to make the geonetry of the housed article readily apparent.
lt is thus seen that by this invent;on a novel single-walled blow molded container having a deep drawn integral hinge is provided. It is further seen that the process of this invention, in conjunction with the unigue blow mold of this invention, makes it possible to provide such a container. As many variations will be apparent to those of skill in the art from a reading of the above specification, which is exemplary in nature, the spirit and scope of the present invention is set forth only by the breadth of the following appended claims.
.
Claims (8)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A blow mold comprising:
a first mating half; and a second mating half comprising a hinge forming area located on an internal surface of said second half;
wherein said hinge forming area consists of an indentation having a depth of draw and a suspended width, and said depth of draw is greater than said suspended width.
a first mating half; and a second mating half comprising a hinge forming area located on an internal surface of said second half;
wherein said hinge forming area consists of an indentation having a depth of draw and a suspended width, and said depth of draw is greater than said suspended width.
2. The blow mold according to claim 1, wherein a cross section of the indentation is triangular.
3. The blow mold according to claim 1, wherein a cross section of the indentation is rectangular.
4. The blow mold according to claim 1, wherein a cross section of the indentation is circular.
5. The blow mold according to claim 1, 2 or 3, wherein said first and second mating halves are adapted to mate along a parting line and said hinge forming area is coincidental with said parting line.
6. A process for forming a blow molded single-walled container having an integral hinge, comprising the steps of:
inflating a parison within a mold, said mold having in the area thereof forming the hinge area a geometry to create a draw ratio of greater than 1 whereby the thickness of hinge portion is of lesser thickness than the adjacent sections of the parison;
removing the thus blow molded parison from the mold;
and severing a contiguous circumference thereof in areas adjacent but other than the hinge portion so as to form a top section and a bottom section connected by said hinge portion.
inflating a parison within a mold, said mold having in the area thereof forming the hinge area a geometry to create a draw ratio of greater than 1 whereby the thickness of hinge portion is of lesser thickness than the adjacent sections of the parison;
removing the thus blow molded parison from the mold;
and severing a contiguous circumference thereof in areas adjacent but other than the hinge portion so as to form a top section and a bottom section connected by said hinge portion.
7. A process according to claim 6 wherein the hinge forming area of said mold is generally parallel to the direc-tion of drop of the parison.
8. The process according to claim 6 wherein the hinge forming area of said mold is perpendicular to the direction of drop of the parison.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US13377880A | 1980-03-26 | 1980-03-26 | |
| US133,778 | 1980-03-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1152712A true CA1152712A (en) | 1983-08-30 |
Family
ID=22460261
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000370783A Expired CA1152712A (en) | 1980-03-26 | 1981-02-13 | Integral hinged single wall blow molded container |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS571725A (en) |
| CA (1) | CA1152712A (en) |
| DE (1) | DE3110708A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02242753A (en) * | 1990-02-17 | 1990-09-27 | Nissan Shatai Co Ltd | Blow molding having hinge |
-
1981
- 1981-02-13 CA CA000370783A patent/CA1152712A/en not_active Expired
- 1981-03-19 DE DE19813110708 patent/DE3110708A1/en not_active Withdrawn
- 1981-03-24 JP JP4184081A patent/JPS571725A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPS571725A (en) | 1982-01-06 |
| DE3110708A1 (en) | 1981-12-24 |
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| JPH0632330U (en) | plastic case |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |