Patent US3892829A successfully refreshed from Google Patents.
US3892829A
Expired / Lapsed
US
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Method of making blown plastic articles
Assignee: OI Glass Inc
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Filing: 1973-10-03
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Granted: 1975-07-01
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Expires: 1993-10-03
Abstract
Abstract A method of making bottles or other blown articles of noncircular or irregular, cross-sectional configuration and of improved wall thickness uniformity. A tubular parison, either of the open-ended or closed-end variety, is blown into a pre-form of a volume, wall thickness and exposed outer surface area generally the same as that of the final article. Preferably, these dimensions of the pre-form are less than those of the final article to avoid pinching between the final blow mold sections. However, at least one cross-sectional dimension of the pre-form is larger than the equivalent dimension of the final article. In the manufacture of bottles of oval cross-section, for example, the closure of the blow mold physically deforms the preform from its original circular cross-section to an oval shape. The pre-form is then blown to the final bottle shape. The combination of physical deformation and final blowing results in the accurate formation of difficulty blowable shapes of remarkably uniform wall thickness. In the manufacture of articles of concavo-convex configuration, the blown pre-form again is of a volume, wall thickness and exposed outer surface area generally the same as that of the final article. The closure of the blow mold on the blown pre-form telescopes one portion of the blown pre-form into the remainder of the blown pre-form so that the overall concavo-convex configuration is obtained. Upon final blowing, minimal inflation is required and the concavo-convex shape is stabilized.
Inventors
- 👤 Albert R Uhlig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:04
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/08; B29C49/16; B29C49/0031; B29C49/42; B29C49/48; B29C49/4802; B29C2049/4805; B29C2949/00; B29C2949/07; B29C2949/0715; B29C49/02; B29C49/06; B29C49/18; B29C49/4273; B29C49/4283
Claims Analysis
Total Claims: 53
Claim 1
Independent Claim
31 words
IN A METHOD OF MAKING A BLOW MOLDED ARTICLE OF NON-CIRCULAR CROSS-SECTION FROM A GENERALLY TUBULAR PLASTIC PARISON OF ESSENTIALLY CIRCULAR CROSS-SECTION AND OF SUBSTANTIALLY UNIFORM WALL THICKNESS, THE STEPS OF:
Claim 2
Dependent Claim
31 words
IN A METHOD OF MAKING A BLOW MOLDED ARTICLE OF NON-CIRCULAR CROSS-SECTION FROM A GENERALLY TUBULAR PLASTIC PARISON OF ESSENTIALLY CIRCULAR CROSS-SECTION AND OF SUBSTANTIALLY UNIFORM WALL THICKNESS, THE STEPS OF:
Claim 3
Dependent Claim
42 words
BLOWING THE PARISON TO THE SHAPE OF A PRE-FORM WITHIN A FIRST BLOW MOLD CAVITY, SAID PRE-FORM HAVING A SUBSTANTIALLY UNIFORM WALL THICKNESS AND AN EXPOSED OUTER SURFACE APPROXIATELY THE SAME AS BUT LESS THAN THE EXPOSED OUTER SURFACE OF THE ARTICLE,
Claim 4
Dependent Claim
42 words
BLOWING THE PARISON TO THE SHAPE OF A PRE-FORM WITHIN A FIRST BLOW MOLD CAVITY, SAID PRE-FORM HAVING A SUBSTANTIALLY UNIFORM WALL THICKNESS AND AN EXPOSED OUTER SURFACE APPROXIATELY THE SAME AS BUT LESS THAN THE EXPOSED OUTER SURFACE OF THE ARTICLE,
Claim 5
Dependent Claim
28 words
INTERPOSING THE PRE-FORM BETWEEN A PAIR OF BLOW MOLD SECTIONS WHICH, WHEN CLOSED, HAVE CAVITY-DEFINING WALLS SPACED APART A DISTANCE LESS THAN THE CROSS-SECTIONAL DIMENSION OF SAID PRE-FORM,
Claim 6
Dependent Claim
28 words
INTERPOSING THE PRE-FORM BETWEEN A PAIR OF BLOW MOLD SECTIONS WHICH, WHEN CLOSED, HAVE CAVITY-DEFINING WALLS SPACED APART A DISTANCE LESS THAN THE CROSS-SECTIONAL DIMENSION OF SAID PRE-FORM,
Claim 7
Dependent Claim
29 words
interposing the pre-form between a pair of blow mold sections which, when closed, have interior cavity-defining walls spaced apart a distance less than the cross-sectional dimension of said pre-form,
Claim 8
Dependent Claim
29 words
interposing the pre-form between a pair of blow mold sections which, when closed, have interior cavity-defining walls spaced apart a distance less than the cross-sectional dimension of said pre-form,
Claim 9
Dependent Claim
47 words
inflating the parison within a first mold cavity into a pre-form having an exposed outer surface area less than but generally the same as the exposed outer surface area of said container, and having at least one cross-sectional dimension greater than the equivalent dimension of said container,
Claim 10
Dependent Claim
47 words
inflating the parison within a first mold cavity into a pre-form having an exposed outer surface area less than but generally the same as the exposed outer surface area of said container, and having at least one cross-sectional dimension greater than the equivalent dimension of said container,
Claim 11
Dependent Claim
44 words
interposing the pre-form between a pair of blow mold sections which, when closed, have cavity-defining walls spaced apart a distance less than the cross-sectional dimension of said pre-form, one of said sections having concave walls and the other of said sections having convex walls;
Claim 12
Dependent Claim
44 words
interposing the pre-form between a pair of blow mold sections which, when closed, have cavity-defining walls spaced apart a distance less than the cross-sectional dimension of said pre-form, one of said sections having concave walls and the other of said sections having convex walls;
Claim 13
Dependent Claim
32 words
A method as defined in claim 1, wherein the article is oval in configuration and the blown essentially circular pre-form is progressively ovalized as the blow mold sections close on the pre-form.
Claim 14
Dependent Claim
28 words
interposing the pre-form between a pair of blow mold sections which, when closed, have cavity-defining walls spaced apart a distance less than the cross-sectional dimension of said pre-form,
Claim 15
Dependent Claim
28 words
interposing the pre-form between a pair of blow mold sections which, when closed, have cavity-defining walls spaced apart a distance less than the cross-sectional dimension of said pre-form,
Claim 16
Dependent Claim
56 words
simultaneously (a) closing the mold sections progressively on said pre-form, (b) progressively deflecting the pre-form by its contact with said walls to a shape closely approaching that of said article, and (c) thermally stabilizing the contacted portion of the pre-form, while preserving the substantially uniform wall thickness and the exposed outer surface of said pre-form, and
Claim 17
Dependent Claim
56 words
simultaneously (a) closing the mold sections progressively on said pre-form, (b) progressively deflecting the pre-form by its contact with said walls to a shape closely approaching that of said article, and (c) thermally stabilizing the contacted portion of the pre-form, while preserving the substantially uniform wall thickness and the exposed outer surface of said pre-form, and
Claim 18
Dependent Claim
56 words
SIMULTANEOUSLY (A) CLOSING THE MOLD SECTIONS PROGRESSIVELY ON SAID PRE-FORM, (B) PROGRESSIVELY DEFLECTING THE PRE-FORM BY ITS CONTACT WITH SAID WALLS TO A SHAPE CLOSELY APPROACHING THAT OF SAID ARTICLE, AND (C) THERMALLY PRELIZING THE CONTACTED PORTION OF THE PRE-FORM, WHILE PRESERVING THE SUBSTANTIALLY UNIFORM WALL THICKNESS AND THE EXPOSED OUTER SURFACE OF SAID PRE-FORM, AND
Claim 19
Dependent Claim
56 words
SIMULTANEOUSLY (A) CLOSING THE MOLD SECTIONS PROGRESSIVELY ON SAID PRE-FORM, (B) PROGRESSIVELY DEFLECTING THE PRE-FORM BY ITS CONTACT WITH SAID WALLS TO A SHAPE CLOSELY APPROACHING THAT OF SAID ARTICLE, AND (C) THERMALLY PRELIZING THE CONTACTED PORTION OF THE PRE-FORM, WHILE PRESERVING THE SUBSTANTIALLY UNIFORM WALL THICKNESS AND THE EXPOSED OUTER SURFACE OF SAID PRE-FORM, AND
Claim 20
Dependent Claim
62 words
closing the mold sections progressively on said pre-form with tHe convex walls of said other section progressively deflecting the portion of said pre-form having a smaller radius toward the other portion of said pre-form during closure to define a shape more closely approaching that of the concave portion of said article, while preserving the substantially uniform wall thickness of said pre-form, and
Claim 21
Dependent Claim
62 words
closing the mold sections progressively on said pre-form with tHe convex walls of said other section progressively deflecting the portion of said pre-form having a smaller radius toward the other portion of said pre-form during closure to define a shape more closely approaching that of the concave portion of said article, while preserving the substantially uniform wall thickness of said pre-form, and
Claim 22
Dependent Claim
38 words
A method as defined in claim 1, wherein the article is concavo-convex in configuration and one-half of the blown, essentially circular pre-form is progressively deformed to a concave configuration as the blow mold sections close on the pre-form.
Claim 23
Dependent Claim
26 words
positioning the pre-form between the open sections of a second, sectional blow mold which, when closed, define a cavity conforming to the shape of said container,
Claim 24
Dependent Claim
26 words
positioning the pre-form between the open sections of a second, sectional blow mold which, when closed, define a cavity conforming to the shape of said container,
Claim 25
Dependent Claim
67 words
progressively closing said mold sections onto said pre-form and (a) progressively contacting a portion of the exposed outer surface of the pre-form with a portion of the cavity-defining walls, (b) thermally stabilizing the contacted portion of said pre-form outer surface, (c) physically deforming the pre-form substantially to the shape of the final article, while (d) maintaining the exterior exposed surface area of said pre-form substantially constant, and
Claim 26
Dependent Claim
67 words
progressively closing said mold sections onto said pre-form and (a) progressively contacting a portion of the exposed outer surface of the pre-form with a portion of the cavity-defining walls, (b) thermally stabilizing the contacted portion of said pre-form outer surface, (c) physically deforming the pre-form substantially to the shape of the final article, while (d) maintaining the exterior exposed surface area of said pre-form substantially constant, and
Claim 27
Dependent Claim
22 words
blowing the deformed and mold-enclosed pre-form into the shape of the final article by expanding the non-contacted, non-stabilized portions of the pre-form.
Claim 28
Dependent Claim
22 words
blowing the deformed and mold-enclosed pre-form into the shape of the final article by expanding the non-contacted, non-stabilized portions of the pre-form.
Claim 29
Dependent Claim
45 words
closing said sections onto said pre-form, the sections contacting and deforming the pre-form prior to complete closure of said sections, due to the greater dimension of said pre-form, and the lesser surface area of said pre-form preventing pinching of the pre-form during such section closure,
Claim 30
Dependent Claim
45 words
closing said sections onto said pre-form, the sections contacting and deforming the pre-form prior to complete closure of said sections, due to the greater dimension of said pre-form, and the lesser surface area of said pre-form preventing pinching of the pre-form during such section closure,
Claim 31
Dependent Claim
18 words
finally blowing the deflected shape to complete the formation of said article interiorly of the closed mold sections.
Claim 32
Dependent Claim
18 words
finally blowing the deflected shape to complete the formation of said article interiorly of the closed mold sections.
Claim 33
Dependent Claim
20 words
In a method of making a blow molded article of non-circular concavo-convex cross-section from a blown pre-form the steps of
Claim 34
Dependent Claim
20 words
In a method of making a blow molded article of non-circular concavo-convex cross-section from a blown pre-form the steps of
Claim 35
Dependent Claim
18 words
finally blowing the deflected shape to complete the formation of said article interiorly of the closed mold sections.
Claim 36
Dependent Claim
18 words
finally blowing the deflected shape to complete the formation of said article interiorly of the closed mold sections.
Claim 37
Dependent Claim
18 words
FINALLY BLOWING THE DEFLECTED SHAPE TO COMPLETE THE FORMATION OF SAID ARTICLE INTERIORLY OF THE CLOSED MOLD SECTIONS.
Claim 38
Dependent Claim
18 words
FINALLY BLOWING THE DEFLECTED SHAPE TO COMPLETE THE FORMATION OF SAID ARTICLE INTERIORLY OF THE CLOSED MOLD SECTIONS.
Claim 39
Dependent Claim
205 words
In a method of making a hollow article of non-circular cross-section and having walls partially telescoped relative to one another, the steps of forming a blowable parison, blowing said parison within a first mold into an oblate pre-form of a wall thickness substantially the same as the wall thickness of said final article, the pre-form when viewed in section having arcuate, semi-cylindrical walls of differing radii, closing onto said pre-form a second, sectional blow mold, a first section of said mold having an interior concave recess and a second section of said mold having a convex projection enterable into said recess when said sections are closed, said sections cooperating to define a blow mold cavity conforming to the shape of the final container, contact between the projection of the second section and the arcuate, semi-cylindrical wall of said pre-form of lesser radius (a) physically deforming the pre-form during the closure of the mold sections to telescope the arcuate wall of lesser radius within the arcuate wall of larger radius and (b) thermally stabilizing at least a portion of the walls of the article at the wall thickness of said pre-form, and finally blowing the deformed and mold-enclosed pre-form into the shape of the final article.
Claim 40
Dependent Claim
205 words
In a method of making a hollow article of non-circular cross-section and having walls partially telescoped relative to one another, the steps of forming a blowable parison, blowing said parison within a first mold into an oblate pre-form of a wall thickness substantially the same as the wall thickness of said final article, the pre-form when viewed in section having arcuate, semi-cylindrical walls of differing radii, closing onto said pre-form a second, sectional blow mold, a first section of said mold having an interior concave recess and a second section of said mold having a convex projection enterable into said recess when said sections are closed, said sections cooperating to define a blow mold cavity conforming to the shape of the final container, contact between the projection of the second section and the arcuate, semi-cylindrical wall of said pre-form of lesser radius (a) physically deforming the pre-form during the closure of the mold sections to telescope the arcuate wall of lesser radius within the arcuate wall of larger radius and (b) thermally stabilizing at least a portion of the walls of the article at the wall thickness of said pre-form, and finally blowing the deformed and mold-enclosed pre-form into the shape of the final article.
Claim 41
Dependent Claim
24 words
thermally stabilizing the contacted portions of the pre-form during Step (4) and thereby substantially maintaining the outer exposed surface area of said pre-form; and
Claim 42
Dependent Claim
24 words
thermally stabilizing the contacted portions of the pre-form during Step (4) and thereby substantially maintaining the outer exposed surface area of said pre-form; and
Claim 43
Dependent Claim
13 words
blowing the deformed pre-form in said cavity after complete closure of said sections.
Claim 44
Dependent Claim
13 words
blowing the deformed pre-form in said cavity after complete closure of said sections.
Claim 45
Dependent Claim
17 words
In a method of making a container of noncircular cross-section from a tubular parison, the steps of:
Claim 46
Dependent Claim
17 words
In a method of making a container of noncircular cross-section from a tubular parison, the steps of:
Claim 47
Dependent Claim
45 words
A method as defined in claim 6, wherein the volume of the pre-form is not more than about 25 percent less than the volume of the final container and the pre-form is expanded by not more than 25 percent during the performance of step (5).
Claim 48
Dependent Claim
54 words
A method as defined in claim 6, wherein the container is oval having major and minor cross-sectional axes and the pre-form is circular in cross-section, the minor cross-section axial dimension of the container being fixed during the performance of step (4) and the major cross-sectional dimension being fixed during the performance of step (5).
Claim 49
Dependent Claim
155 words
In a method of making a concavo-convex article from a tubular parison, the steps of: forming a blown pre-form of substantially circular cross-section and substantially uniform wall thickness and including two portions of different radii, each of said portions being generally semi-cylindrical; the exposed outer surface area of the pre-form being less than the exposed outer surface area of said article; POSITIONING the pre-form between the open sections of a sectional blow mold which, when closed, define a cavity conforming to the concavo-convex shape of said article, closing said sections onto said pre-form, one of the sections contacting and deforming the portion of the pre-form having a smaller radius telescopically into the remainder of the pre-form prior to complete closure of said sections, and the lesser surface area of said pre-form preventing pinching of the pre-form during such section closure, and blowing the deformed, telescoped pre-form in said cavity after complete closure of said sections.
Claim 50
Dependent Claim
155 words
In a method of making a concavo-convex article from a tubular parison, the steps of: forming a blown pre-form of substantially circular cross-section and substantially uniform wall thickness and including two portions of different radii, each of said portions being generally semi-cylindrical; the exposed outer surface area of the pre-form being less than the exposed outer surface area of said article; POSITIONING the pre-form between the open sections of a sectional blow mold which, when closed, define a cavity conforming to the concavo-convex shape of said article, closing said sections onto said pre-form, one of the sections contacting and deforming the portion of the pre-form having a smaller radius telescopically into the remainder of the pre-form prior to complete closure of said sections, and the lesser surface area of said pre-form preventing pinching of the pre-form during such section closure, and blowing the deformed, telescoped pre-form in said cavity after complete closure of said sections.
Claim 51
Dependent Claim
20 words
In a method of making a blow molded article of non-uniform cross-section from a blowable plastic parison, the steps of:
Claim 52
Dependent Claim
20 words
In a method of making a blow molded article of non-uniform cross-section from a blowable plastic parison, the steps of:
Claim 53
Dependent Claim
42 words
The method defined in claim 10, characterized by closure of said mold sections in Step (3) avoiding pinching of said pre-form due to the exposed outer surface area of said pre-form being less than the exposed outer surface area of said article.
References Cited (Backward Citations)
US3579622A
Cited
US3736201A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-30 | 1978-12-30 | 1979-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-30 | 1982-12-30 | 1983-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-30 | 1986-12-30 | 1987-07-01 | $7700.00 | Window Closed / Lapsed |