US3896648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blow molding process for container of superplastic alloy
Assignee: ALTER LICENSING ESTABLISHMENT
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Filing: 1974-05-31
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Granted: 1975-07-29
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Expires: 1994-05-31
Abstract
Abstract A container of a superplastic alloy material is manufactured by causing a fluid to blow into a bottomed cylinder. Prior to the blow molding, the cylinder has its surfaces finished smooth and is preheated in a temperature range of 200* - 300*C at least two minutes. Within a metal mold, the cylinder is subjected to an initial pressure of at least 8 atm., and is thereafter subjected to a molding pressure in the range of 7 - 20 atm. into the container blown out to the final dimensions. Since the molding pressure is lastly bestowed after somewhat inflating the cylinder by the initial pressure, the product is blowmolded finely, and a beautiful container having neither a flaw nor a crack on the surface is obtained.
Inventors
- 👤 Francis Schertenleib
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:38
CPC Classifications
B; B21; B21D; B21D26/00; B21D26/02; B21D26/053; B21D26/055; B21D26/033; B21D26/041; B21D26/043; B21D26/049; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49805
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
140 words
A method of manufacturing a blow-molded article of a container made of a superplastic alloy, comprising the steps of: a. forming a bottomed cylinder from a starting material of said superplastic alloy, b. performing a mechanical finish processing for smoothing the surfaces of said cylinder and for enhancing the dimensional accuracy, c. preheating the finish-processed cylinder by holding it in a temperature range of 200* to 300*C for at least two minutes, d. receiving the heated cylinder in a metal mold assembly, and blowing out said cylinder from the port side towards the interior thereof by fluid pressures of an initial pressure of at least 8 atm. and a molding pressure in the range of 7 - 20 atm., and e. cooling said metal mold assembly by air blast before it is opened to take out the inflated product therefrom.
Claim 2
Independent Claim
140 words
A method of manufacturing a blow-molded article of a container made of a superplastic alloy, comprising the steps of: a. forming a bottomed cylinder from a starting material of said superplastic alloy, b. performing a mechanical finish processing for smoothing the surfaces of said cylinder and for enhancing the dimensional accuracy, c. preheating the finish-processed cylinder by holding it in a temperature range of 200* to 300*C for at least two minutes, d. receiving the heated cylinder in a metal mold assembly, and blowing out said cylinder from the port side towards the interior thereof by fluid pressures of an initial pressure of at least 8 atm. and a molding pressure in the range of 7 - 20 atm., and e. cooling said metal mold assembly by air blast before it is opened to take out the inflated product therefrom.
Claim 3
Dependent Claim
39 words
The method according to claim 1, wherein the superplastic alloy material is a member selected from the group consisting of Zn - Al, Al - Cu, Al - Si, Mg - Al, Mg - Cu and Mg - Ni.
Claim 4
Dependent Claim
61 words
The method according to claim 1, wherein a lug is formed at the bottom of said bottomed cylinder, while a depression corresponding to said lug is formed in a bottom mold of said metal mold assembly, and when said metal mold assembly is closed, said lug is inserted into said depression so as to hold the central position of said cylinder.
Claim 5
Dependent Claim
88 words
The method according to claim 1, wherein the superplastic alloy material is subjected to the preheating treatment at 260*C + or - 10*C for 10 minutes to 15 minutes, it is subsequently held under the initial pressure of 10 atm. for 2 to 3 seconds in said metal mold assembly heated to at most 600*C, and it is thereafter blown therein under the molding pressure of 17 atm. for 43 to 57 seconds, so that it is made the inflated container having a maximum blow ratio of 3.
Claim 6
Dependent Claim
31 words
The method according to claim 1, wherein said bottomed cylinder is obtained by subjecting a slab of the superplastic alloy material to any of impact molding, compression molding and vacuum molding.
Claim 7
Dependent Claim
23 words
The method according to claim 1, wherein said bottomed cylinder is obtained by providing a bottom at one end of an extrusion-molded tube.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |