Patent US3788199A successfully refreshed from Google Patents.
US3788199A
Expired / Lapsed
US
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Method for manufacturing heavy duty bags
Assignee: Resonac Holdings Corp
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Filing: 1970-11-10
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Granted: 1974-01-29
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Expires: 1990-11-10
Abstract
Abstract A method for manufacturing heavy duty bags wherein stretched tapes made of synthetic resin such as high density polyethylene or polypropylene are spirally wound in opposite directions in a manner to intersect each other to form a plurality of superposed cylindrical bodies. The superposed portions of the intersecting stretched tapes forming said cylindrical bodies are bonded together to form a cylindrical network, one end of which is sealed to provide a bottom.
Inventors
- 👤 W Sato
- 👤 F Iriko
- 👤 S Yamamoto
- 👤 M Fujisawa
- 👤 S Hatakeyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:41
CPC Classifications
B; B65; B65D; B65D29/00; B65D29/02; B29; B29C; B29C53/00; B29C53/56; B29C53/58; B29C53/581; B29C53/60; B29C53/607; B31; B31C; B31C3/00; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2023/0608; B29K2023/065; B29K2023/10; B29K2023/12; B29L; B29L2031/00; B29L2031/712; B29L2031/7128; B31B; B31B2155/00; B31B2170/00; B31B2170/20; Y; Y10; Y10S; Y10S493/00; Y10S493/916
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
206 words
A method for manufacturing a heavy duty bag comprising the steps of: arranging a plurality of endless belts such that their outer strips define an approximately cylindrical form as viewed horizontally; causing said belts to travel at the same speed along the axis of said cylindrical form; rotating a plurality of tape holding means in opposite directions in turn about the axis of said cylindrical form; feeding from the holding means theremoplastic synthetic resin tapes coated with a heat-sealable adhesive to spirally wind the tapes about the peripheral surface of the cylindrical form defined by the travelling endless belts in opposite direction turn in a manner to intersect each other; bonding the superposed portions of the intersecting tapes to form a cylindrical network; and sealing one end of said cylindrical network; said bonding step including provisionally and partially compression-bonding superposed portions of the intersecting tapes formed on the travelling endless belts by a supplementary roll means to such an extent as to cause the tapes not to separate from one another, and then feeding the resultant cylindrical network from the belts between a pair of heated press rolls so as to flatten the network as well as to completely bond the superposed portions of the tapes.
Claim 2
Independent Claim
206 words
A method for manufacturing a heavy duty bag comprising the steps of: arranging a plurality of endless belts such that their outer strips define an approximately cylindrical form as viewed horizontally; causing said belts to travel at the same speed along the axis of said cylindrical form; rotating a plurality of tape holding means in opposite directions in turn about the axis of said cylindrical form; feeding from the holding means theremoplastic synthetic resin tapes coated with a heat-sealable adhesive to spirally wind the tapes about the peripheral surface of the cylindrical form defined by the travelling endless belts in opposite direction turn in a manner to intersect each other; bonding the superposed portions of the intersecting tapes to form a cylindrical network; and sealing one end of said cylindrical network; said bonding step including provisionally and partially compression-bonding superposed portions of the intersecting tapes formed on the travelling endless belts by a supplementary roll means to such an extent as to cause the tapes not to separate from one another, and then feeding the resultant cylindrical network from the belts between a pair of heated press rolls so as to flatten the network as well as to completely bond the superposed portions of the tapes.
Claim 3
Dependent Claim
31 words
The method according to claim 1 comprising spreading a thermoplastic synthetic resin film in advance over the peripheral surface of the cylindrical form defined by said plurality of travelling endless belts.
Claim 4
Dependent Claim
40 words
The method according to claim 1 wherein said provisionally and partially compression-bonding step includes pressing superposed portions of said intersecting tapes simultaneously on both the inner and outer surfaces of the intersecting tapes by means of said supplementary roll means.
References Cited (Backward Citations)
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Cited
US2213290A
Cited
US2777501A
Cited
US3004585A
Cited
US3257915A
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US3515621A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |