US3893879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing a plastic corrugated board and apparatus therefor
Assignee: Mitsui Toatsu Chemicals Inc
•
Filing: 1971-10-22
•
Granted: 1975-07-08
•
Expires: 1991-10-22
Abstract
Abstract A process for producing a plastic corrugated board and an apparatus therefor, wherein a molten thermoplastic resin is extruded through a flat die to form a flat sheet; the flat sheet thus extruded is then directed to a pair of opposed corrugatesurfaced rolls for passage of the sheet through a gap formed therebetween, after the temperature of said flat sheet has been adjusted by means of touch rolls, thereby forming a corrugated core sheet the configuration of said gap accomodating the crosssectional configuration of the corrugated core sheet; a flat sheet of a thermoplastic resin extruded from another die is laid on said corrugated core sheet mounted on the corrugate-surfaced roll, and at the same time said flat sheet is press-adhered to the corrugated core sheet by cool air blown onto the joining portions thus forming a single-face corrugated board; the singleface corrugated board is then reversely mounted on a flat roll where a flat sheet of a thermoplastic resin extruded from still another die is laid on the corrugated core sheet of said singleface corrugated board so that the former may be pressed onto the latter for adhesion by cool air blown onto the joining portions thereof, thereby providing a double-face corrugated board; and then each of the two sides of the double-face corrugated board is cooled separately by means of a cooling means, thereby insuring flatness of said corrugated board.
Inventors
- 👤 Tadashi Ito
- 👤 Nobuo Tsuru
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:23
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/22; B29C43/30; B29C43/305; B32; B32B; B32B3/00; B32B3/26; B32B3/28; B32B27/00; B32B27/06; B32B27/08; B32B27/32; B32B2307/00; B32B2307/70; B32B2307/704; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1007; Y10T156/1008; Y10T156/101; Y10T156/1025
Claims Analysis
Total Claims: 77
Claim 1
Independent Claim
13 words
A PROCESS FOR PRODUCING A CORRUGATED BOARD OF A THERMOPLASTIC RESIN WHICH COMPRISIS:
Claim 2
Dependent Claim
13 words
A PROCESS FOR PRODUCING A CORRUGATED BOARD OF A THERMOPLASTIC RESIN WHICH COMPRISIS:
Claim 3
Dependent Claim
10 words
EXTRUDING SAID THERMOPLASTIC RESIN TO FORM A FIRST FLAT SHEET:
Claim 4
Dependent Claim
10 words
EXTRUDING SAID THERMOPLASTIC RESIN TO FORM A FIRST FLAT SHEET:
Claim 5
Dependent Claim
41 words
PASSING SAID FIRST FLAT SHEET THROUGH A GAP FORMED BETWEEN A PAIR OF CORRUGATING ROLLS HAVING CORRUGATED SURFACES TO FORM A CORRUGATED CORE SHEET HAVING CORRUGATIONS EXTENDING PARALLEL TO THE DIRECTION OF PASSAGE OF SAID CORE SHEET BETWEEN SAID CORRUGATING ROLLS:
Claim 6
Dependent Claim
41 words
PASSING SAID FIRST FLAT SHEET THROUGH A GAP FORMED BETWEEN A PAIR OF CORRUGATING ROLLS HAVING CORRUGATED SURFACES TO FORM A CORRUGATED CORE SHEET HAVING CORRUGATIONS EXTENDING PARALLEL TO THE DIRECTION OF PASSAGE OF SAID CORE SHEET BETWEEN SAID CORRUGATING ROLLS:
Claim 7
Dependent Claim
41 words
passing said first flat sheet through a gap formed between a pair of corrugating rolls having corrugated surfaces to form a corrugated core sheet having corrugations extending parallel to the direction of passage of said core sheet between said corrugating rolls;
Claim 8
Dependent Claim
41 words
passing said first flat sheet through a gap formed between a pair of corrugating rolls having corrugated surfaces to form a corrugated core sheet having corrugations extending parallel to the direction of passage of said core sheet between said corrugating rolls;
Claim 9
Dependent Claim
41 words
passing said first flat sheet through a gap formed between a pair of corrugating rolls having corrugated surfaces to form a corrugated core sheet having corrugations extending parallel to the direction of passage of said core sheet between said corrugating rolls;
Claim 10
Dependent Claim
41 words
passing said first flat sheet through a gap formed between a pair of corrugating rolls having corrugated surfaces to form a corrugated core sheet having corrugations extending parallel to the direction of passage of said core sheet between said corrugating rolls;
Claim 11
Dependent Claim
40 words
The process as defined in claim 1 which includes the step of adjusting the temperature of said first flat sheet prior to being corrugated by contact with touch rolls and varying the angle of contact thereof with said touch rolls.
Claim 12
Dependent Claim
48 words
a pair of touch rolls operatively associated with and located below said first flat sheet die for receiving said first flat sheet and provided with means for cooling said first flat sheet and with means for varying the contacting angle of said first flat sheet with said rolls;
Claim 13
Dependent Claim
48 words
a pair of touch rolls operatively associated with and located below said first flat sheet die for receiving said first flat sheet and provided with means for cooling said first flat sheet and with means for varying the contacting angle of said first flat sheet with said rolls;
Claim 14
Dependent Claim
131 words
a pair of independently driven counter rotatable corrugating rolls adapted to form said first flat sheet into a corrugated core sheet, said pair of rolls consisting of a first roll having a corrugated surface operatively associated with and located below said touch rolls for receiving said first flat sheet and a second roll having a corrugated surface, said rolls having plural corrugations on their peripheries extending normal to the axes of said rolls, and being separated from one another to form a gap having a configuration accommodating the configuration of the formed corrugated core sheet, said rolls being provided with tEmperature adjusting means and a speed control mechanism causing said second roll to rotate at a peripheral speed of from 1 to 20 percent higher than that of said first roll;
Claim 15
Dependent Claim
131 words
a pair of independently driven counter rotatable corrugating rolls adapted to form said first flat sheet into a corrugated core sheet, said pair of rolls consisting of a first roll having a corrugated surface operatively associated with and located below said touch rolls for receiving said first flat sheet and a second roll having a corrugated surface, said rolls having plural corrugations on their peripheries extending normal to the axes of said rolls, and being separated from one another to form a gap having a configuration accommodating the configuration of the formed corrugated core sheet, said rolls being provided with tEmperature adjusting means and a speed control mechanism causing said second roll to rotate at a peripheral speed of from 1 to 20 percent higher than that of said first roll;
Claim 16
Dependent Claim
13 words
A process for producing a corrugated board of a thermoplastic resin which comprises:
Claim 17
Dependent Claim
13 words
A process for producing a corrugated board of a thermoplastic resin which comprises:
Claim 18
Dependent Claim
38 words
MAINTAINING ONE OF SAID CORRUGATING ROLLS CARRYING SAID CORRUGATED CORE SHEET AT A PERIPHERAL SPEED FROM 1 TO 20 PERCENT HIGHER THAN THAT OF THE OTHER OF SAID CORRUGATING ROLLS TO PROVIDE TENSION TO SAID CORRUGATED CORE SHEET:
Claim 19
Dependent Claim
38 words
MAINTAINING ONE OF SAID CORRUGATING ROLLS CARRYING SAID CORRUGATED CORE SHEET AT A PERIPHERAL SPEED FROM 1 TO 20 PERCENT HIGHER THAN THAT OF THE OTHER OF SAID CORRUGATING ROLLS TO PROVIDE TENSION TO SAID CORRUGATED CORE SHEET:
Claim 20
Dependent Claim
38 words
maintaining one of said corrugating rolls carrying said corrugated core sheet At a peripheral speed from 1 to 20 percent higher than that of the other of said corrugating rolls to provide tension to said corrugated core sheet;
Claim 21
Dependent Claim
38 words
maintaining one of said corrugating rolls carrying said corrugated core sheet At a peripheral speed from 1 to 20 percent higher than that of the other of said corrugating rolls to provide tension to said corrugated core sheet;
Claim 22
Dependent Claim
38 words
maintaining one of said corrugating rolls carrying said corrugated core sheet at a peripheral speed from 1 to 20 percent higher than that of the other of said corrugating rolls to provide tension to said corrugated core sheet;
Claim 23
Dependent Claim
38 words
maintaining one of said corrugating rolls carrying said corrugated core sheet at a peripheral speed from 1 to 20 percent higher than that of the other of said corrugating rolls to provide tension to said corrugated core sheet;
Claim 24
Dependent Claim
8 words
extruding a second flat sheet of thermoplastic resin;
Claim 25
Dependent Claim
8 words
extruding a second flat sheet of thermoplastic resin;
Claim 26
Dependent Claim
8 words
extruding a second flat sheet of thermoplastic resin;
Claim 27
Dependent Claim
8 words
extruding a second flat sheet of thermoplastic resin;
Claim 28
Dependent Claim
8 words
EXTRUDING A SECOND FLAT SHEET OF THERMOPLASTIC RESIN:
Claim 29
Dependent Claim
8 words
EXTRUDING A SECOND FLAT SHEET OF THERMOPLASTIC RESIN:
Claim 30
Dependent Claim
24 words
The process as defined in claim 3 which includes the step of varying the cooling speeds on said both sides of said double-face board.
Claim 31
Dependent Claim
47 words
a second flat sheet die operatively associated with and located above said second corrugating roll and adapted to extrude a thermoplastic resin to form a second flat sheet and to lay said second flat sheet into the formed corrugated core sheet carried on said second corrugating roll;
Claim 32
Dependent Claim
47 words
a second flat sheet die operatively associated with and located above said second corrugating roll and adapted to extrude a thermoplastic resin to form a second flat sheet and to lay said second flat sheet into the formed corrugated core sheet carried on said second corrugating roll;
Claim 33
Dependent Claim
46 words
a first air blowing means being adjacent to said second corrugating roll and provided with means to adjust the air temperature, air flow rate and direction of the air blown to press-adhere said second flat sheet to the corrugated core and form a single-face corrugated board;
Claim 34
Dependent Claim
46 words
a first air blowing means being adjacent to said second corrugating roll and provided with means to adjust the air temperature, air flow rate and direction of the air blown to press-adhere said second flat sheet to the corrugated core and form a single-face corrugated board;
Claim 35
Dependent Claim
51 words
The process as defined in claim 3 wherein the formation of said corrugated core sheet and the adhesion of said core sheet to said second and third flat sheets is carried out at a temperature of from 80* to 140*C. and the thermoplastic resin is a crystalline polymer of propylene basis.
Claim 36
Dependent Claim
28 words
LAYING SAID SECOND FLAT SHEET ON SAID CORRUGATED CORE SHEET FROM ABOVE WHILE SAID CORRUGATED CORE SHEET IS RETAINED ON SAID CORRUGATING ROLL HAVING THE HIGHER PERIPHERAL SPEED:
Claim 37
Dependent Claim
28 words
LAYING SAID SECOND FLAT SHEET ON SAID CORRUGATED CORE SHEET FROM ABOVE WHILE SAID CORRUGATED CORE SHEET IS RETAINED ON SAID CORRUGATING ROLL HAVING THE HIGHER PERIPHERAL SPEED:
Claim 38
Dependent Claim
28 words
laying said second flat sheet on said corrugated core sheet from above while said corrugated core sheet is retained on said corrugating roll having the higher peripheral speed;
Claim 39
Dependent Claim
28 words
laying said second flat sheet on said corrugated core sheet from above while said corrugated core sheet is retained on said corrugating roll having the higher peripheral speed;
Claim 40
Dependent Claim
28 words
laying said second flat sheet on said corrugated core sheet from above while said corrugated core sheet is retained on said corrugating roll having the higher peripheral speed;
Claim 41
Dependent Claim
28 words
laying said second flat sheet on said corrugated core sheet from above while said corrugated core sheet is retained on said corrugating roll having the higher peripheral speed;
Claim 42
Dependent Claim
79 words
press-adhering said second flat sheet to said corrugated core sheet to form a single-face corrugated board while said second flat sheet is at a sufficiently high temperature to maintain it in the plastic state and said corrugated core sheet is at a sufficiently high temperature to effect adhering, said press-adhering being completed by the weight of said second flat sheet and the tension therein in addition to the pressure of cool air blown onto said second flat sheet; and
Claim 43
Dependent Claim
79 words
press-adhering said second flat sheet to said corrugated core sheet to form a single-face corrugated board while said second flat sheet is at a sufficiently high temperature to maintain it in the plastic state and said corrugated core sheet is at a sufficiently high temperature to effect adhering, said press-adhering being completed by the weight of said second flat sheet and the tension therein in addition to the pressure of cool air blown onto said second flat sheet; and
Claim 44
Dependent Claim
80 words
PRESS-ADHERING SAID SECOND FLAT SHEET TO SAID CORRUGATED CORE SHEET TO FORM A SINGLE-FACE CORRUGATED BOARD WHILE SAID SECOND FLAT SHEET IS AT A SUFFICIENTLY HIGH TEMPERATURE TO MAINTAIN IT IN THE PLASTIC STATE AND SAID CORRUGATED CORE SHEET IS AT A SUFFICIENTLY HIGH TEMPERATURE TO EFFECT ADHERING , SAID PRESS-ADHERING BEING COMPLETED BY THE WEIGHT OF SAID SECOND FLAT SHEET AND THE TENSION THEREIN IN ADDITION TO THE PRESSURE OF COOL AIR BLOWN INTO SAID SECOND FLAT SHEET: AND
Claim 45
Dependent Claim
80 words
PRESS-ADHERING SAID SECOND FLAT SHEET TO SAID CORRUGATED CORE SHEET TO FORM A SINGLE-FACE CORRUGATED BOARD WHILE SAID SECOND FLAT SHEET IS AT A SUFFICIENTLY HIGH TEMPERATURE TO MAINTAIN IT IN THE PLASTIC STATE AND SAID CORRUGATED CORE SHEET IS AT A SUFFICIENTLY HIGH TEMPERATURE TO EFFECT ADHERING , SAID PRESS-ADHERING BEING COMPLETED BY THE WEIGHT OF SAID SECOND FLAT SHEET AND THE TENSION THEREIN IN ADDITION TO THE PRESSURE OF COOL AIR BLOWN INTO SAID SECOND FLAT SHEET: AND
Claim 46
Dependent Claim
78 words
press-adhering said second flat sheet to said corrugated core sheet to form a single-face corrugated board while said second flat sheet is at a sufficiently high temperature to maintain it in the plastic state and said corrugated core sheet is at a sufficiently high temperature to effect adhering, said press-adhering being completed by the weight of said second flat sheet and the tension therein in addition to the pressure of cool air blown onto said second flat sheet;
Claim 47
Dependent Claim
78 words
press-adhering said second flat sheet to said corrugated core sheet to form a single-face corrugated board while said second flat sheet is at a sufficiently high temperature to maintain it in the plastic state and said corrugated core sheet is at a sufficiently high temperature to effect adhering, said press-adhering being completed by the weight of said second flat sheet and the tension therein in addition to the pressure of cool air blown onto said second flat sheet;
Claim 48
Dependent Claim
52 words
The process as defined in claim 3 wherein the double-face corrugated board is drawn by take up means and said cooling is conducted while maintaining the double-face corrugated board under tension, said take up means having a peripheral speed of from 1 to 10 percent greater than that of said flat roll.
Claim 49
Dependent Claim
49 words
a flat roll provided with temperature adjusting means operatively associated with and adapted to rotate at the same peripheral speed and counterwise to said second corrugating roll to receive said single-face corrugated board with the single flat face thereof being in contact with the surface of said flat roll;
Claim 50
Dependent Claim
49 words
a flat roll provided with temperature adjusting means operatively associated with and adapted to rotate at the same peripheral speed and counterwise to said second corrugating roll to receive said single-face corrugated board with the single flat face thereof being in contact with the surface of said flat roll;
Claim 51
Dependent Claim
44 words
a third flat sheet die operatively associated with and located above said flat roll and adapted to extrude a thermoplastic resin to form a third flat sheet and to lay said third flat sheet onto the single-face corrugated board carried on said flat roll;
Claim 52
Dependent Claim
44 words
a third flat sheet die operatively associated with and located above said flat roll and adapted to extrude a thermoplastic resin to form a third flat sheet and to lay said third flat sheet onto the single-face corrugated board carried on said flat roll;
Claim 53
Dependent Claim
40 words
The process as defined in claim 3 which includes the step of adjusting the temperature of said first flat sheet prior to being corrugated by contact with touch rolls and varying the angle of contact thereof with said touch rolls.
Claim 54
Dependent Claim
20 words
directing said single-face corrugated board around a flat roll with said second flat sheet in contact with said flat roll;
Claim 55
Dependent Claim
20 words
directing said single-face corrugated board around a flat roll with said second flat sheet in contact with said flat roll;
Claim 56
Dependent Claim
20 words
COOLING BOTH SIDES OF SAID SINGLE-FACE CORRUGATED BOARD SEPARATELY AND UNDER TENSION THEREBY CORRECTING CURVING AND IMPROVING THE FLATNESS THEREOF.
Claim 57
Dependent Claim
20 words
COOLING BOTH SIDES OF SAID SINGLE-FACE CORRUGATED BOARD SEPARATELY AND UNDER TENSION THEREBY CORRECTING CURVING AND IMPROVING THE FLATNESS THEREOF.
Claim 58
Dependent Claim
20 words
cooling both sides of said single-face corrugated board separately and under tension thereby correcting curving and improving the flatness thereof.
Claim 59
Dependent Claim
20 words
cooling both sides of said single-face corrugated board separately and under tension thereby correcting curving and improving the flatness thereof.
Claim 60
Dependent Claim
8 words
extruding a third flat sheet of thermoplastic resin;
Claim 61
Dependent Claim
8 words
extruding a third flat sheet of thermoplastic resin;
Claim 62
Independent Claim
14 words
An apparatus for producing a double-face corrugated board of a thermoplastic resin which comprises:
Claim 63
Independent Claim
14 words
An apparatus for producing a double-face corrugated board of a thermoplastic resin which comprises:
Claim 64
Dependent Claim
46 words
a second air blowing means being adjacent to said flat roll and provided with means to adjust the air temperature, air flow rate and direction of the air blown to press-adhere said third flat sheet to the single-face corrugated board to form said double-face corrugated board;
Claim 65
Dependent Claim
46 words
a second air blowing means being adjacent to said flat roll and provided with means to adjust the air temperature, air flow rate and direction of the air blown to press-adhere said third flat sheet to the single-face corrugated board to form said double-face corrugated board;
Claim 66
Dependent Claim
12 words
means for drawing the produced corrugated board from said flat roll; and
Claim 67
Dependent Claim
12 words
means for drawing the produced corrugated board from said flat roll; and
Claim 68
Dependent Claim
16 words
laying said third flat sheet on said single-face corrugated board while retained on said flat roll;
Claim 69
Dependent Claim
16 words
laying said third flat sheet on said single-face corrugated board while retained on said flat roll;
Claim 70
Dependent Claim
41 words
The apparatus as defined in claim 8 wherein said cooling means which is arranged in opposed relation to the produced corrugated board is a pair of cooling means each divided into plural segments and provided with an independent temperature adjusting mechanism.
Claim 71
Dependent Claim
22 words
The apparatus as defined in claim 8 wherein said first, second and third flat sheet dies are connected to a single extruder.
Claim 72
Dependent Claim
79 words
press-adhering said third flat sheet to said corrugated core sheet to form a double-face corrugated board while said third flat sheet is at a sufficiently high temperature to maintain it in the plastic state and said corrugated core sheet is at a sufficiently high temperature to effect adhering said press-adhering being completed by the weight of said third flat sheet and the tension therein in addition to the pressure of cool air blown onto said third flat sheet; and
Claim 73
Dependent Claim
79 words
press-adhering said third flat sheet to said corrugated core sheet to form a double-face corrugated board while said third flat sheet is at a sufficiently high temperature to maintain it in the plastic state and said corrugated core sheet is at a sufficiently high temperature to effect adhering said press-adhering being completed by the weight of said third flat sheet and the tension therein in addition to the pressure of cool air blown onto said third flat sheet; and
Claim 74
Dependent Claim
21 words
cooling means arranged in opposed relation and intercepting therebetween the produced corrugated board at a position apart from said flat roll.
Claim 75
Dependent Claim
21 words
cooling means arranged in opposed relation and intercepting therebetween the produced corrugated board at a position apart from said flat roll.
Claim 76
Dependent Claim
19 words
cooling both sides of said double-face corrugated board separately under tension thereby correcting curving and improving the flatness thereof.
Claim 77
Dependent Claim
19 words
cooling both sides of said double-face corrugated board separately under tension thereby correcting curving and improving the flatness thereof.
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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) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |