CA1230809A - Sheet material - Google Patents
Sheet materialInfo
- Publication number
- CA1230809A CA1230809A CA000431044A CA431044A CA1230809A CA 1230809 A CA1230809 A CA 1230809A CA 000431044 A CA000431044 A CA 000431044A CA 431044 A CA431044 A CA 431044A CA 1230809 A CA1230809 A CA 1230809A
- Authority
- CA
- Canada
- Prior art keywords
- sheet
- sheets
- edges
- overlap
- discontinuous
- 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
- 239000000463 material Substances 0.000 title abstract description 4
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 21
- 229920001971 elastomer Polymers 0.000 claims abstract description 21
- 238000005755 formation reaction Methods 0.000 claims abstract description 21
- 230000000295 complement effect Effects 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 claims abstract description 5
- 239000004636 vulcanized rubber Substances 0.000 claims description 10
- 239000012790 adhesive layer Substances 0.000 claims 2
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 239000010410 layer Substances 0.000 claims 1
- 239000000853 adhesive Substances 0.000 abstract description 2
- 230000001070 adhesive effect Effects 0.000 abstract description 2
- YXZBWJWYWHRIMU-UBPCSPHJSA-I calcium trisodium 2-[bis[2-[bis(carboxylatomethyl)amino]ethyl]amino]acetate ytterbium-169 Chemical compound [Na+].[Na+].[Na+].[Ca+2].[169Yb].[O-]C(=O)CN(CC([O-])=O)CCN(CC(=O)[O-])CCN(CC([O-])=O)CC([O-])=O YXZBWJWYWHRIMU-UBPCSPHJSA-I 0.000 abstract 1
- 238000003490 calendering Methods 0.000 description 5
- 238000004073 vulcanization Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 229920000742 Cotton Polymers 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 229920002943 EPDM rubber Polymers 0.000 description 1
- 244000043261 Hevea brasiliensis Species 0.000 description 1
- 239000006057 Non-nutritive feed additive Substances 0.000 description 1
- 239000004599 antimicrobial Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
Landscapes
- Lining Or Joining Of Plastics Or The Like (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
Abstract
ABSTRACT
SHEET MATERIAL
A method of making a large elongate discontinuous sheet comprises:
(i) providing a plurality of vulcanizable rubber sheets the bonding edges of which comprise complementary formations, (ii) overlapping said bonding edges by engaging said complementary formations, the thickness of the resulting overlap (27) being substantially equal to that of the surrounding sheet, and (iii) subjecting the assembly to conditions which will vulcanize the assembly and bond the overlapped edges.
The join or joins 27 are preferably longitudinal of the sheet and are achieved without the need for an adhesive. The main advantage of the method is that it results in a sheet without enlarged seams i.e. a better looking product with fewer handling difficulties. Uses of the sheet product include roofing and tank lining.
Also described is an apparatus for making the sheet material which comprises carrier means for receiving a plurality of sheets and supply means for feeding the sheets to said carrier means so that adjacent sheets overlap.
SHEET MATERIAL
A method of making a large elongate discontinuous sheet comprises:
(i) providing a plurality of vulcanizable rubber sheets the bonding edges of which comprise complementary formations, (ii) overlapping said bonding edges by engaging said complementary formations, the thickness of the resulting overlap (27) being substantially equal to that of the surrounding sheet, and (iii) subjecting the assembly to conditions which will vulcanize the assembly and bond the overlapped edges.
The join or joins 27 are preferably longitudinal of the sheet and are achieved without the need for an adhesive. The main advantage of the method is that it results in a sheet without enlarged seams i.e. a better looking product with fewer handling difficulties. Uses of the sheet product include roofing and tank lining.
Also described is an apparatus for making the sheet material which comprises carrier means for receiving a plurality of sheets and supply means for feeding the sheets to said carrier means so that adjacent sheets overlap.
Description
Jo 123(~5~9 sheer MATERIAL
This invention relates to an apparatus for assembling a plurality of smaller profiled sheets to form one sheet, to a method of making one sheet from a plurality of smaller profiled sheets, and to the resulting product.
Known methods of producing large sheets of e.g. vulcanized rubber from a plurality of smaller, vulcanizable rubber sheets involve winding the smaller sheets onto a mandrel so that adjacent edges overlap and then vulcanizing the assembly, thereby bonding the overlapped edges. The disadvantages are that (i) in the region of the joints the sheet is of variable thickness which is unsightly and can cause handling difficulties in operation before, during and after vulcanization and (ii) joints are longitudinal of the mandrel which can limit the finished sheet size.
The aim of the present invention is to produce a sheet by joining a plurality of smaller sheets whilst avoiding the formation of thickened seams.
According to one aspect of the present invention, a method of making a discontinuous sheet comprises:
(i) providing a plurality of vulcanizable rubber sheets the bonding edges of which comprise complementary formations (ii) overlapping said bonding edges by engaging said complementary formations, the thickness of the resulting overlap being substantially equal to that of the surrounding sheet, and (iii) subjecting the assembly to conditions which will vulcanize the assembly and bond the overlapped edges.
Also described herein is an apparatus for assembling a plurality of sheets to form a single sheet construction, which comprises carrier means for receiving a plurality of sheets and supply means for feeding the sheets to said carrier means so that adjacent sheets overlap. Optionally, means for squeezing the overlapping portions together of I' 1~308(P9 can be provided.
According to a further aspect of the present invention, a discontinuous vulcanized rubber sheet comprises a plurality of smaller sheets, the adjacent edges of which are provided with complementary formations in overlapping bonged engagement, and the thickness of the overlap being substantially equal to that of the surrounding sheet.
The embodiments of the present invention are particularly applicable to the formation of profiled vulcanized rubber sheets which can subsequently be bonded together and vulcanized simultaneously without the need for an adhesive into an elongate sheet. By discontinuous is meant that the sheet is not endless e.g. is not annular. A proprietary processing aid may be incorporated when preparing the vulcanizable rubber composition. The w lcanizable rubber composition usually contains at least 25 by weight of rubber. Examples of rubber include EPDM, natural rubber, SIR and any other usually used in the manufacture of sheet materials. Preferably the Sirius of the vulcanizable rubber sheets are not treated with an antiseptic agent such as talc as this may impair the bond obtained between the sheets when overlapped.
An example of a pair of complementary formations consists of a rib on each sheet member, the resultant overlap interface of the engaged formations being between the outer surfaces of the two sheets so joined but preferably not extending continuously between them. Preferably the overlap interface is a a small angle e.g. up to 1 to the plane of the sheet.
Preferably the bonded overlapped edges are longitudinal of a finished elongate sheet, rather than lateral, and are substantially parallel to the edges of the finished sheet, and of course to any other bonded overlap.
One or more of the sheets to be joined together 12308~9 3.
may be a laminate of thinner layers. When such a laminate is formed it may be designed so that the laminate are of different widths, thereby forming a stepped edge. Such a laminate can then be used in the method of the present invention without the need for any further shaping. When calendering single ply rubber membranes occasional flaws or pin holes may occur, giving rise to problems with the quality and acceptance of the product. If a laminate of two or more sheets is used, the probability of superimposing flaws or pin holes is extremely small.
A sheet may be shaped by urging it in contact with a profile roller the roller having a collar adjacent at least one end thereof, the collar being tapered towards the adjacent end of the roller and having a maximum depth less than that of the sheet.
If a single profile roller is to be used to shape the edges of each sheet in one process, then alternate sheets will need to be reversed in order to engage the complementary formations. Alternatively a profile roller with a single collar could be used to shape one sheet, the sheet could then be reversed and the same roller used to shape the reverse surface.
Where a single profile roller is used, the complementary formations will be symmetrical about the plane of overlap and one surface of each formation will be that of its respective sheet (e.g. see Figure VI).
Uses of the final sheet product of the present I invention include roofing membranes and reservoir liners.
Preferred embodiments according to the present invention will now be described by way of example only with reference to the accompanying drawings in which Figure I is an axial view of 3-roll calender in combination with a profile roller for producing profiled sheet rubber;
Figure II is a side view of the profile roller ~230~3~9 4.
shown in Figure I;
Figure III is of a schematic apparatus by which = a plurality of rubber sheets are vulcanization bonded to form a single sheet;
Figure IV is a perspective view of part of the apparatus shown in Figure III;
Figure V is a plan view of the single vulcanized rubber sheet resulting from the process described with respect to Figures III and IV;
figure VI is a sectional view along line AA' of Figure V;
Figure VII is an axial view of a 4-roll calender for producing a stepped sheet.
Referring to Figures I and II, the 3-roll calender consists of a top roller 1, calender roller 2, and a bottom roller 3 The nips Ahab between rollers 1/2 and
This invention relates to an apparatus for assembling a plurality of smaller profiled sheets to form one sheet, to a method of making one sheet from a plurality of smaller profiled sheets, and to the resulting product.
Known methods of producing large sheets of e.g. vulcanized rubber from a plurality of smaller, vulcanizable rubber sheets involve winding the smaller sheets onto a mandrel so that adjacent edges overlap and then vulcanizing the assembly, thereby bonding the overlapped edges. The disadvantages are that (i) in the region of the joints the sheet is of variable thickness which is unsightly and can cause handling difficulties in operation before, during and after vulcanization and (ii) joints are longitudinal of the mandrel which can limit the finished sheet size.
The aim of the present invention is to produce a sheet by joining a plurality of smaller sheets whilst avoiding the formation of thickened seams.
According to one aspect of the present invention, a method of making a discontinuous sheet comprises:
(i) providing a plurality of vulcanizable rubber sheets the bonding edges of which comprise complementary formations (ii) overlapping said bonding edges by engaging said complementary formations, the thickness of the resulting overlap being substantially equal to that of the surrounding sheet, and (iii) subjecting the assembly to conditions which will vulcanize the assembly and bond the overlapped edges.
Also described herein is an apparatus for assembling a plurality of sheets to form a single sheet construction, which comprises carrier means for receiving a plurality of sheets and supply means for feeding the sheets to said carrier means so that adjacent sheets overlap. Optionally, means for squeezing the overlapping portions together of I' 1~308(P9 can be provided.
According to a further aspect of the present invention, a discontinuous vulcanized rubber sheet comprises a plurality of smaller sheets, the adjacent edges of which are provided with complementary formations in overlapping bonged engagement, and the thickness of the overlap being substantially equal to that of the surrounding sheet.
The embodiments of the present invention are particularly applicable to the formation of profiled vulcanized rubber sheets which can subsequently be bonded together and vulcanized simultaneously without the need for an adhesive into an elongate sheet. By discontinuous is meant that the sheet is not endless e.g. is not annular. A proprietary processing aid may be incorporated when preparing the vulcanizable rubber composition. The w lcanizable rubber composition usually contains at least 25 by weight of rubber. Examples of rubber include EPDM, natural rubber, SIR and any other usually used in the manufacture of sheet materials. Preferably the Sirius of the vulcanizable rubber sheets are not treated with an antiseptic agent such as talc as this may impair the bond obtained between the sheets when overlapped.
An example of a pair of complementary formations consists of a rib on each sheet member, the resultant overlap interface of the engaged formations being between the outer surfaces of the two sheets so joined but preferably not extending continuously between them. Preferably the overlap interface is a a small angle e.g. up to 1 to the plane of the sheet.
Preferably the bonded overlapped edges are longitudinal of a finished elongate sheet, rather than lateral, and are substantially parallel to the edges of the finished sheet, and of course to any other bonded overlap.
One or more of the sheets to be joined together 12308~9 3.
may be a laminate of thinner layers. When such a laminate is formed it may be designed so that the laminate are of different widths, thereby forming a stepped edge. Such a laminate can then be used in the method of the present invention without the need for any further shaping. When calendering single ply rubber membranes occasional flaws or pin holes may occur, giving rise to problems with the quality and acceptance of the product. If a laminate of two or more sheets is used, the probability of superimposing flaws or pin holes is extremely small.
A sheet may be shaped by urging it in contact with a profile roller the roller having a collar adjacent at least one end thereof, the collar being tapered towards the adjacent end of the roller and having a maximum depth less than that of the sheet.
If a single profile roller is to be used to shape the edges of each sheet in one process, then alternate sheets will need to be reversed in order to engage the complementary formations. Alternatively a profile roller with a single collar could be used to shape one sheet, the sheet could then be reversed and the same roller used to shape the reverse surface.
Where a single profile roller is used, the complementary formations will be symmetrical about the plane of overlap and one surface of each formation will be that of its respective sheet (e.g. see Figure VI).
Uses of the final sheet product of the present I invention include roofing membranes and reservoir liners.
Preferred embodiments according to the present invention will now be described by way of example only with reference to the accompanying drawings in which Figure I is an axial view of 3-roll calender in combination with a profile roller for producing profiled sheet rubber;
Figure II is a side view of the profile roller ~230~3~9 4.
shown in Figure I;
Figure III is of a schematic apparatus by which = a plurality of rubber sheets are vulcanization bonded to form a single sheet;
Figure IV is a perspective view of part of the apparatus shown in Figure III;
Figure V is a plan view of the single vulcanized rubber sheet resulting from the process described with respect to Figures III and IV;
figure VI is a sectional view along line AA' of Figure V;
Figure VII is an axial view of a 4-roll calender for producing a stepped sheet.
Referring to Figures I and II, the 3-roll calender consists of a top roller 1, calender roller 2, and a bottom roller 3 The nips Ahab between rollers 1/2 and
2/3 are the same and equal to the thickness desired for the final sheet product. A driven profile roller 5 having a diameter half that of the calender roller 2 is provided adjacent the calender roller 2 at a distance governed by the height of nips Ahab and degree of profiling required.
Each end 6,7 of the profile roller 5 is provided with a circumferential collar 8,9 an enlargement of one of which is shown. Each collar 8,9 tapers radially inwards in the direction towards the respective end 6,7 of the roller and the maximum collar depth 10 at the axially inner edge of the collar is about one half of the desired calendered sheet thickness. The angle of taper is less than 1 and the drawings are exaggerated to show this.
When the calender is in operation, vulcanizable rubber stock 11 is fed through the nip pa of the rotating rollers 1,2 to produce a sheet 12. The sheet 12 is then fed between calender roller 2 and driven profile roller 5. The collars 8,9 of the profile roller 5 profile the outer edges of the rubber sheet, the it I
tapering causing the rubber stock to move outwardly rather than towards the centre of the sheet. Excess rubber is trimmed away by a nip roller (not how).
The surface speed of the profile roller 5 is usually from 1 to 5% faster than that of the calender roller 2. The profiled sheet is then fed through nip pa, - around the bottom rod or 3 and over a roller 13 to take-up means (not shown). A modification of this apparatus would be a 4-roll calender in which two sheets of different widths could be brought together to give a profiled 2-ply sheet in a single pass, e.g. as in Figure VII.
( Referring to Figures III and IV, the apparatus consists of three main units i.e. a liner feed/tension adjuster 14, a mandrel on rails 15 and a calender stock feed station 16. Liner 17 which is of woven synthetic/cotton fabric is fed between two rotating rollers 18, 19, around another two rollers 20,21, over a hydraulic arm 22, and onto a rotating mandrel 23. At the same time strips 24 of calendered profiled vulcanizable rubber stock such as those produced by the apparatus shown in Figure I are fed onto the mandrel 23 from rollers 25 in the calender stock feed station 16. Alternate rollers 25 are inverted. As the stock is wound from the rollers 24 the liners of ( woven synthetic/cotton fabric separating each turn on each roller 25 are taken up on rollers 26. The strips of calendered profiled stock 24 are aligned so that complementary rib formations are engaged at the surface of the mandrel 23 and tension is adjusted so that there is no stretching of the vulcanizable rubber during the winding. The speeds of the liner feed, mandrel rotation and calender feed stock are synchronized to ensure smooth running of the continuous process. The hydraulic arm 22 is used as a pressure bar to consolidate the overlap of the complementary edges of the strips 24.
The liner is kept under tension an dafter the rubber stock has been completely wound onto the mandrel, '. ;;
,;
1~3(~
at least three complete turns ox liner are added, The wound liner is then secured in tension before the mandrel is removed to an autoclave for vulcanization.
The resulting sheet which may be about 20 feet 5 wide and 500 feet long is shown in Figures V and VI.
Although the overlaps 27 are shown in the drawings - the aim of the invention is to make the seams as unobtrusive as possible and to avoid any appreciable variation in thickness across the finished sheet as 10 a result of the joints. me width 28 is that of each calendered strip and the seams run parallel to the winding direction of the mandrel upon which the sheet was consolidated and vulcanized. me overlap interfaces of the engaged ribs are substantially in 15 the plane of the sheet and do not extend between the outer surfaces of the sheet as would be the case erg.
if two sheets with 45 complementary sloped edges were joined.
Referring to Figure VII, the 4-roll calender 20 consists of a pair of top rollers 29,30, a pair of bottom rollers 31,32 and a pair of compaction rollers 33~34l The nips 35 and 36 are not necessarily the same but are substantially equal to the required - thickness of the upper famine 37 and lower larnina 38 25 respectively. When the calender is in operation wlcanizable rubber stock 39,40, not necessarily of theism composition, lo fédthrough nephew respectively by movement (shown by arrows) of rollers 29 and 30 or 31 and 32 respectively. The resulting laming 37,38 30 are then fed between the compaction rollers 33,34 which squeeze them into a tickled assembly. By forming two laming of different dimensions a sheet having redeemed "stepped" edges can be made without the need for a profile roller or the like. Lengths 35 of the resulting sheet can be joined using the apparatus shown in Figures III and IVY
Each end 6,7 of the profile roller 5 is provided with a circumferential collar 8,9 an enlargement of one of which is shown. Each collar 8,9 tapers radially inwards in the direction towards the respective end 6,7 of the roller and the maximum collar depth 10 at the axially inner edge of the collar is about one half of the desired calendered sheet thickness. The angle of taper is less than 1 and the drawings are exaggerated to show this.
When the calender is in operation, vulcanizable rubber stock 11 is fed through the nip pa of the rotating rollers 1,2 to produce a sheet 12. The sheet 12 is then fed between calender roller 2 and driven profile roller 5. The collars 8,9 of the profile roller 5 profile the outer edges of the rubber sheet, the it I
tapering causing the rubber stock to move outwardly rather than towards the centre of the sheet. Excess rubber is trimmed away by a nip roller (not how).
The surface speed of the profile roller 5 is usually from 1 to 5% faster than that of the calender roller 2. The profiled sheet is then fed through nip pa, - around the bottom rod or 3 and over a roller 13 to take-up means (not shown). A modification of this apparatus would be a 4-roll calender in which two sheets of different widths could be brought together to give a profiled 2-ply sheet in a single pass, e.g. as in Figure VII.
( Referring to Figures III and IV, the apparatus consists of three main units i.e. a liner feed/tension adjuster 14, a mandrel on rails 15 and a calender stock feed station 16. Liner 17 which is of woven synthetic/cotton fabric is fed between two rotating rollers 18, 19, around another two rollers 20,21, over a hydraulic arm 22, and onto a rotating mandrel 23. At the same time strips 24 of calendered profiled vulcanizable rubber stock such as those produced by the apparatus shown in Figure I are fed onto the mandrel 23 from rollers 25 in the calender stock feed station 16. Alternate rollers 25 are inverted. As the stock is wound from the rollers 24 the liners of ( woven synthetic/cotton fabric separating each turn on each roller 25 are taken up on rollers 26. The strips of calendered profiled stock 24 are aligned so that complementary rib formations are engaged at the surface of the mandrel 23 and tension is adjusted so that there is no stretching of the vulcanizable rubber during the winding. The speeds of the liner feed, mandrel rotation and calender feed stock are synchronized to ensure smooth running of the continuous process. The hydraulic arm 22 is used as a pressure bar to consolidate the overlap of the complementary edges of the strips 24.
The liner is kept under tension an dafter the rubber stock has been completely wound onto the mandrel, '. ;;
,;
1~3(~
at least three complete turns ox liner are added, The wound liner is then secured in tension before the mandrel is removed to an autoclave for vulcanization.
The resulting sheet which may be about 20 feet 5 wide and 500 feet long is shown in Figures V and VI.
Although the overlaps 27 are shown in the drawings - the aim of the invention is to make the seams as unobtrusive as possible and to avoid any appreciable variation in thickness across the finished sheet as 10 a result of the joints. me width 28 is that of each calendered strip and the seams run parallel to the winding direction of the mandrel upon which the sheet was consolidated and vulcanized. me overlap interfaces of the engaged ribs are substantially in 15 the plane of the sheet and do not extend between the outer surfaces of the sheet as would be the case erg.
if two sheets with 45 complementary sloped edges were joined.
Referring to Figure VII, the 4-roll calender 20 consists of a pair of top rollers 29,30, a pair of bottom rollers 31,32 and a pair of compaction rollers 33~34l The nips 35 and 36 are not necessarily the same but are substantially equal to the required - thickness of the upper famine 37 and lower larnina 38 25 respectively. When the calender is in operation wlcanizable rubber stock 39,40, not necessarily of theism composition, lo fédthrough nephew respectively by movement (shown by arrows) of rollers 29 and 30 or 31 and 32 respectively. The resulting laming 37,38 30 are then fed between the compaction rollers 33,34 which squeeze them into a tickled assembly. By forming two laming of different dimensions a sheet having redeemed "stepped" edges can be made without the need for a profile roller or the like. Lengths 35 of the resulting sheet can be joined using the apparatus shown in Figures III and IVY
Claims (19)
THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE PROPERTY
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method of making a discontinuous sheet comprising:
(i) providing a plurality of vulcanizable rubber sheets the bonding edges of which comprise complementary formations, (ii) overlapping said bonding edges by engaging said complementary formations, the thickness of the resulting overlap being substantially equal to that of the surrounding sheet, and, (iii) subjecting the assembly to conditions which will vulcanize the assembly and bond the overlapped edges.
(i) providing a plurality of vulcanizable rubber sheets the bonding edges of which comprise complementary formations, (ii) overlapping said bonding edges by engaging said complementary formations, the thickness of the resulting overlap being substantially equal to that of the surrounding sheet, and, (iii) subjecting the assembly to conditions which will vulcanize the assembly and bond the overlapped edges.
2. A method according to claim 1 wherein there is no adhesive layer between the overlapped edges.
3. A method according to claim 1 or 2 wherein the vulcanizable rubber sheets are not treated with an anti-stick agent before overlapping the bonding edges thereof.
4. A method according to claim 1 wherein the dis-continuous sheet is elongate.
5. A method according to claim 4 wherein the bonded overlapped edges are longitudinal of the sheet.
6. A method according to claim 1 wherein the overlap interface of the engaged formations is between the outer surfaces of the two sheets to be joined but does not extend continuously between them.
7. A method according to claim 6 wherein the overlap interface is up to 1° to the plane of the sheet product.
8. A method according to claim 1 wherein one or more of the sheets to be joined together is a laminate of two or more thinner layers.
9. A method according to claim 1, 2 or 6 wherein the complementary formations consist of a rib on each sheet member.
10. A method according to claim 1, wherein the sheets are fed onto a carrier means in such a way that the bonding edges of the sheets overlap by engagement of the complementary formations.
11. A method according to claim 10 wherein the carrier means is a mandrel.
8.
8.
12. A method according to claim 11 wherein the sheets are fed onto the mandrel circumferential.
13. A method according to claim 10, 11 or 12 wherein the overlapping edges are squeezed together.
14. A discontinuous vulcanized rubber sheet which comprises a plurality of smaller sheets, the adjacent edges of which are provided with complementary formations in overlapping bonded engagement, and the thickness of the overlap being substantially equal to that of the surrounding sheet.
15. A discontinuous vulcanized rubber sheet according to claim 14 wherein there is no adhesive layer between the overlapped edges.
16. A discontinuous vulcanized rubber sheet according to claim 14 or 15 which is elongate and the overlapped edges are longitudinal thereof.
17. A discontinuous vulcanized rubber sheet according to claim 14 wherein the overlap interface of the engaged formations is between the outer surfaces of the sheet so joined but does not extend continuously between them.
18. A discontinuous vulcanized rubber sheet according to claim 17 wherein the overlap interface is up to 1° to the plane of the sheet.
19. A discontinuous vulcanized rubber sheet according to claim 14 in which the complementary formations consist of a rib on each sheet member.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8218981 | 1982-07-01 | ||
| GB8218981 | 1982-07-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1230809A true CA1230809A (en) | 1987-12-29 |
Family
ID=10531400
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000431044A Expired CA1230809A (en) | 1982-07-01 | 1983-06-23 | Sheet material |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1230809A (en) |
| NZ (1) | NZ204652A (en) |
-
1983
- 1983-06-21 NZ NZ204652A patent/NZ204652A/en unknown
- 1983-06-23 CA CA000431044A patent/CA1230809A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NZ204652A (en) | 1986-07-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |