CA1079171A - Process for the manufacture of multilayer impermeable strips - Google Patents
Process for the manufacture of multilayer impermeable stripsInfo
- Publication number
- CA1079171A CA1079171A CA244,955A CA244955A CA1079171A CA 1079171 A CA1079171 A CA 1079171A CA 244955 A CA244955 A CA 244955A CA 1079171 A CA1079171 A CA 1079171A
- Authority
- CA
- Canada
- Prior art keywords
- strips
- layer
- asphalt
- rollers
- strip
- 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
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Abstract
ABSTRACT OF THE DISCLOSURE:
The invention is concerned with a process for the manufacture of multilayer moisture-impermeable strips having at lesast two very thin continuous flexible plastic layers bonded together by an adhesive medium constituted by a layer of asphalt, the thickness of which is a large multiple of the thickness of the plastic layers and is adjustable at will. The process of the invention comprises the steps of continuously feeding at least two very thin strips of polyethylene in spaced facing relation to each other to define a space between their facing surface; continously supplying an asphalt mixture containing 65-70% of asphalt, 25-30% of slate shale and 5-10% of latex or a latex-type elastomer, in a hot molten condition, into such space; continuously bonding the very thin strips to the asphalt mixture by supplying pressure to the outer surfaces of the strips to subject the strips and the asphalt mixture to compression to form a three-layer multi-layer moisture-impermeable strip;
simultaneously with such pressure application, and in the zone of pressure application, continuously cooling the very thin strips by conducting heat away from the outer surfaces thereof while the strips are subjected to compression; and thereafter further cooling the multi-layer strip. The invention enables one to obtain a thick strip (about 4 mm thick) having two very thin layers (0.02 to 0.09 mm thick) of an extremely flexible material (polyethylene) and a thick layer of an adequate asphalt mixture placed between them, and to obtain a perfect adhesion in such a type of strip, in which the proofing base is the polyethylene layers, whereas the thick asphalt layer acts both as a protective and as adhesive.
The invention is concerned with a process for the manufacture of multilayer moisture-impermeable strips having at lesast two very thin continuous flexible plastic layers bonded together by an adhesive medium constituted by a layer of asphalt, the thickness of which is a large multiple of the thickness of the plastic layers and is adjustable at will. The process of the invention comprises the steps of continuously feeding at least two very thin strips of polyethylene in spaced facing relation to each other to define a space between their facing surface; continously supplying an asphalt mixture containing 65-70% of asphalt, 25-30% of slate shale and 5-10% of latex or a latex-type elastomer, in a hot molten condition, into such space; continuously bonding the very thin strips to the asphalt mixture by supplying pressure to the outer surfaces of the strips to subject the strips and the asphalt mixture to compression to form a three-layer multi-layer moisture-impermeable strip;
simultaneously with such pressure application, and in the zone of pressure application, continuously cooling the very thin strips by conducting heat away from the outer surfaces thereof while the strips are subjected to compression; and thereafter further cooling the multi-layer strip. The invention enables one to obtain a thick strip (about 4 mm thick) having two very thin layers (0.02 to 0.09 mm thick) of an extremely flexible material (polyethylene) and a thick layer of an adequate asphalt mixture placed between them, and to obtain a perfect adhesion in such a type of strip, in which the proofing base is the polyethylene layers, whereas the thick asphalt layer acts both as a protective and as adhesive.
Description
~075~17~
The present invention relates to a process for the manufacture of multilayer impermeable strips for use, for example, in the building industry, particularly for making damp proof floors. ~lultilayer strips of this nature are commonly used for this purpose and, thus, the object of this invention is a process for making said strips which offers certain advantages and allows the disadvantages ordinarily encountered in the diverse stages of such processes to be overcome.
In order to perform their function and, at the same time, to facilitate their application, the waterproof sheets made by the process of the invention are formed by very thin sheets of polyethylene alternating with substantially thicker asphalt layers, the simplest waterproof sheet being formed of two outer sheets of polyethylene and an inner asphalt layer.
The asphalt layer consists of an asphalt mixture containing 65-70% asphalt, 25-30~ slate shale and 5-10% of latex or a latex-type elastomer.
In these compound sheets,apart from its adhesive ~unction, the asphalt mixture has also the more important function of waterproofing. In order to fulfill this function the asphalt mixture must be substantially thicker than the minimum thickness necessary for adhesive purposes.
In order to form the asphalt mixture into a sheet layer and bind it to the adjacent plastic sheets, it is necessary to melt it and bring it into contact with the plastic sheets but, sincc thc mclting tcmpcrature o~ thc asphalt is normally higher than that of the plastic sheets, the important problem arises, in this operation, of avoiding the melting of the plastic sheets when they contact the molten asphalt. This problem is less important when the asphalt layer is thin with respect to the plastic sheets used, since in such case the heat contained ~, ~07~17~
in the asphalt layer and partially transferred to the plastic sheets is not sufficient to cause melting of the plastic and may be removed with delayed refrigeration.
The problem solved by the present invention is serious.
The essence of the invention resides in the fact that a simple pair of compression rollers performs the following operations simultaneously: (a) rolling of the molten asphalt mixture;
(b) bonding of the asphalt mixture to the adjacent polyethylene sheets and (c) cooling of these sheets precisely at the time and place when and where they contact the molten asphalt mixture, by way of layers of water picked up by the rollers as they turn.
What is really an achievement of the present invention is to obtain a thick strip (about 4 mm thick) having two very thin layers (0.02 to 0.09 mm thick) of an extremely flexible material (polyethylene) and a thick layer of an adequate asphalt mixture placed between them. This is not easily done, since the asphalt does not easily adhere to the polyethylene. The process of the invention makes it possible to obtain a perfect adhesion in such a type of strip, in which the proofing base is the polyethylene layers, whereas the thick asphalt layer acts both as a protective and as adhesive.
The present invention therefore provides a process for the manufacture of multilayer moisture-impermeable strips having at least two very thin continuous flexible plastic layers bonded together by an adhesive medium constituted by a layer of asphalt, the thickness of which is a large multiple of the thickness of the plastic layers and is adjustable at will, which process comprises the steps o continuously feeding at least two very thin strips of polyethylene in spaced facing relation to each other to define a space between their facing surface; continuously supplying an asphalt mixture containing 17~
65-70% of asphalt , 25-30% of slate shale and 5-10% of latex or a latex-type elastomer, in a hot molten condition, into such space; continuously bonding the very thin strips to the asphalt mixture by supplying pressure to the outer surfaces of the strips to subject the strips and the asphalt mixture to compression to form a three-layer multi-layer moisture-impermeable strip;
simultaneously with such pressure application, and in the zone of pressure application, continuously cooling the very thin strips by conducting heat away from the outer surfaces thereof while the strips are subjected to compression; and thereafter further cooling the multi-layer strip.
In the process of the invention at least two continuous layers of polyethylene web having therebetween, as adhesive medium, an evenly distributed layer of asphalt mixture, the thickness of which may be adjusted as required, are bonded together under pressure, the asphalt mixture being applied hot in fluid state, the polyethylene webs being cooled by a water film applied to their surfaces opposite to the asphalt contacting surfaces, thereby obviating detrimental alterations which would take place in the webs or layers due to the heat given off by the molten asphalt mixture.
The polyethylene layers or webs may be of any suitable thickness. Normally, a thin polyethylene layer is preferred, e.g. from about 0.01 mm to about 0.10 mm thick. The molten asphalt layer is relatively thicker, preferably in the range of about 4 mm. and,as mentioned earlier, it consists of an asphalt mixtuLe containing 65-70~ asphalt, 25-30~ slate shale and 5-10% latex or a latex-type elastomer. In the present specification, the word "asphalt" is used to Mean an asphalt mixture of the type described in the preceding sentence.
In one embodiment, two layers of polyethylene web partially wrap respective rollers rotating in opposite direc-~075~171' tions, there being formed between these rollers, with respective webs wrapped therearound, a nip into which a flow of fluid asphalt mixture is evenly poured and subjected to compression to form the multilayer strip.
The two rollers used for producing the bonding of the polyethylene web layers to the intermediate asphalt layer are adjustable in position with a view to providing a wider or narrower nip, as required, in order to control the thickness of the asphalt layer or allow space for a larger number of component layers of the multilayer strip.
Two or more pairs of rollers may act downstream in order to add further polyethylene web layers and asphalt layers to the simple initial three layer strip to form a multilayer strip of the required number of layers.
According to one process embodying the invention, the rollers operate partially submerged in water in order to create around their periphery a water film which is applied to the roller contacting surface of the respective polyethylene web layer for cooling thereof.
The rollers may be cooled by internal circulation of water flowing through suitable means fitted to their axial support points.
Further objects and features of the invention will be disclosed in detail in the following description, with reference to the attached illustrative drawings wherein:
Figure 1 is a diagrammatic side elevation of one cm~)~)dilnent of a device fc>r the manufacturc Or multilayer strips according to the invention; and Figure 2 is a top plan view of the device of Figure 1.
In the process illustrated in the figures, two layers lA and lB of polyethylene web, being fed from respective reels 2A and 2B, partially wrap cylindrical rollers 3A and 3B which 1()7~17~
are disposed in parallel and rotate in opposite directions sothat the polyethylene webs converge in a downward direction.
Said rollers 3A and 3B rotate on shafts 4A and ~ connected to relative drive means.
Disposed above the rollers 3A and 3B there is an asphalt mixture applicator box 5 which, in its simplest form, comprises two end walls 5A, the two rotating rollers 3A and 3B
enclosing the open bottom side of the box. A molten asphalt mixture 6 containing 65/70% asphalt, 2S/30% slate shale and 5/10~ latex or latex-type elastomer is poured into the box 5 from a feed source 7 and is distributed over the nip between the rollers and roller wrapping webs lA and lB. Alternatively two series of rollers arranged parallel to the polyethylene webs for transfer of the asphalt mixture thereto could be used.
Thereafter the combined rotation and compression of the cylindrical rollers 3A and 3B creates a pressure against the polyethylene web strips lA and lB and the asphalt mixture layer 6 sandwiched therebetween to form the simplest, three-layer construction of the multilayer strip.
The thickness of the asphalt layer 6 is adjusted as required between 1 and 4 mm by increasing or reducing the nip dimension between rollers 3A and 3B by way of suitable adjustment ~07~17~
means attached thereto.
The multilayer strip is submerged in water 9 contained in a tray 10. The cylindrical rollers 3A and 3B are partially submerged in the water 9, whereby they pick up a water film on their external surfaces and which is transferred to the roller contacting surfaces of the polyethylene web strips lA and 1~.
The wetted rollers 3A and 3B first contact the polyethylene webs 1A and 1~ respectively at points located 30 cm. (measured along the lengths of the webs) ahead of the places where the webs 1A and 1B are first contacted by the hot asphalt mixture.
This arrangement is nece~ssary to prevent the heat of the molten asphalt mixture 6 from causing deterioration of the polyethylene webs 1~ and 1~ which are readly damaged by such heat.
The purpose of passing the multilayer strip 8 through the water 9 is to complete cooling and stabilization of the strip. In order to aid in the above cooling action, the invention also contemplates having water circulate in the interiors of the cylindrical rollers 3A and 3~, passing thereto through tubular shafts 4A and 4B.
In order to obtain multilayer strips comprising a large number of layers, the initial three-layer strip, formed by two polyethylene web strips, e.g. about 0.012 mm to 0.09 mm thickness and an intermediate asphalt mixture layer, e.g. 4mm in thickness, i9 passed through similar devices in such a way that the three-layer strip and a further polyethylene web are ~ed through each of such de~ices, together with the relati~e intermediate asphalt mixture layer.
The rollers are slightly rough and are 40 cms minimum diameter.
The water is entrained by the rollers and wets each polyethylene web on its radially-inner face 30 cms before it contacts the asphalt at 180C.
~(375~17~
~he water film trapped or insertea between the poly-ethylene webs and the rollers evaporates on contact with the asphalt mixture at 180~. Whereby the double cooling effect is achieved of:
a~ pre~e~ting ~ any further heat increase;
b) increase of cooling effect by absorption of 80 cal/g as the water passes from liquid phase to steam phase.
This completely new system has enabled the use, never achieved before, of a high-pressure, low-density polyethylene film having a melting point of 95C approximately and using even 50 gauge films, equivalent to 0.012 mm, which are the minimum thicknesses currently being manufactured. All this is achieved as the laminate is being manufactured.
In this process the polyethylene web runs right from before the roll nip to the laminate take-up wetted in water, and in this wa~ it is possible to submerge the asphalt mixture at 180C in the water.
The system is really absolutely necessary when, as in the invention, asphalt layer thicknesses of at least 1 to 2 mm is used, since the ratio between the great heat content of the asphalt mixture and the polyethylene material is as high as 200:1.
A further advantage of this process is that when the polyethylene materi21 leaves the process, it has the same physical and chemical properties as before the process, some-thing not achieved with any other existing process.
This process enables the product to be made at speeds of from 40 metres per minute to the unbelievable speed of 1 metre per minute.
It can be added as a differentiating factor that this process is completely continuous from the material entry to winding up and packing.
1()7S~17~
The invention contemplates the use of other forms of the device for making the multilayer strips by the process, among which there is one formed by endless conveyor belts which carry the polyethylene webs to which the layer of asphalt mixture is applied with a doctor blade, with said layers being subjected to a suitable pressure, it being possible to provide a plurality of said layers by using a suitable number of endless belts. The belts are submerged (partially submerged) in water.
The present invention relates to a process for the manufacture of multilayer impermeable strips for use, for example, in the building industry, particularly for making damp proof floors. ~lultilayer strips of this nature are commonly used for this purpose and, thus, the object of this invention is a process for making said strips which offers certain advantages and allows the disadvantages ordinarily encountered in the diverse stages of such processes to be overcome.
In order to perform their function and, at the same time, to facilitate their application, the waterproof sheets made by the process of the invention are formed by very thin sheets of polyethylene alternating with substantially thicker asphalt layers, the simplest waterproof sheet being formed of two outer sheets of polyethylene and an inner asphalt layer.
The asphalt layer consists of an asphalt mixture containing 65-70% asphalt, 25-30~ slate shale and 5-10% of latex or a latex-type elastomer.
In these compound sheets,apart from its adhesive ~unction, the asphalt mixture has also the more important function of waterproofing. In order to fulfill this function the asphalt mixture must be substantially thicker than the minimum thickness necessary for adhesive purposes.
In order to form the asphalt mixture into a sheet layer and bind it to the adjacent plastic sheets, it is necessary to melt it and bring it into contact with the plastic sheets but, sincc thc mclting tcmpcrature o~ thc asphalt is normally higher than that of the plastic sheets, the important problem arises, in this operation, of avoiding the melting of the plastic sheets when they contact the molten asphalt. This problem is less important when the asphalt layer is thin with respect to the plastic sheets used, since in such case the heat contained ~, ~07~17~
in the asphalt layer and partially transferred to the plastic sheets is not sufficient to cause melting of the plastic and may be removed with delayed refrigeration.
The problem solved by the present invention is serious.
The essence of the invention resides in the fact that a simple pair of compression rollers performs the following operations simultaneously: (a) rolling of the molten asphalt mixture;
(b) bonding of the asphalt mixture to the adjacent polyethylene sheets and (c) cooling of these sheets precisely at the time and place when and where they contact the molten asphalt mixture, by way of layers of water picked up by the rollers as they turn.
What is really an achievement of the present invention is to obtain a thick strip (about 4 mm thick) having two very thin layers (0.02 to 0.09 mm thick) of an extremely flexible material (polyethylene) and a thick layer of an adequate asphalt mixture placed between them. This is not easily done, since the asphalt does not easily adhere to the polyethylene. The process of the invention makes it possible to obtain a perfect adhesion in such a type of strip, in which the proofing base is the polyethylene layers, whereas the thick asphalt layer acts both as a protective and as adhesive.
The present invention therefore provides a process for the manufacture of multilayer moisture-impermeable strips having at least two very thin continuous flexible plastic layers bonded together by an adhesive medium constituted by a layer of asphalt, the thickness of which is a large multiple of the thickness of the plastic layers and is adjustable at will, which process comprises the steps o continuously feeding at least two very thin strips of polyethylene in spaced facing relation to each other to define a space between their facing surface; continuously supplying an asphalt mixture containing 17~
65-70% of asphalt , 25-30% of slate shale and 5-10% of latex or a latex-type elastomer, in a hot molten condition, into such space; continuously bonding the very thin strips to the asphalt mixture by supplying pressure to the outer surfaces of the strips to subject the strips and the asphalt mixture to compression to form a three-layer multi-layer moisture-impermeable strip;
simultaneously with such pressure application, and in the zone of pressure application, continuously cooling the very thin strips by conducting heat away from the outer surfaces thereof while the strips are subjected to compression; and thereafter further cooling the multi-layer strip.
In the process of the invention at least two continuous layers of polyethylene web having therebetween, as adhesive medium, an evenly distributed layer of asphalt mixture, the thickness of which may be adjusted as required, are bonded together under pressure, the asphalt mixture being applied hot in fluid state, the polyethylene webs being cooled by a water film applied to their surfaces opposite to the asphalt contacting surfaces, thereby obviating detrimental alterations which would take place in the webs or layers due to the heat given off by the molten asphalt mixture.
The polyethylene layers or webs may be of any suitable thickness. Normally, a thin polyethylene layer is preferred, e.g. from about 0.01 mm to about 0.10 mm thick. The molten asphalt layer is relatively thicker, preferably in the range of about 4 mm. and,as mentioned earlier, it consists of an asphalt mixtuLe containing 65-70~ asphalt, 25-30~ slate shale and 5-10% latex or a latex-type elastomer. In the present specification, the word "asphalt" is used to Mean an asphalt mixture of the type described in the preceding sentence.
In one embodiment, two layers of polyethylene web partially wrap respective rollers rotating in opposite direc-~075~171' tions, there being formed between these rollers, with respective webs wrapped therearound, a nip into which a flow of fluid asphalt mixture is evenly poured and subjected to compression to form the multilayer strip.
The two rollers used for producing the bonding of the polyethylene web layers to the intermediate asphalt layer are adjustable in position with a view to providing a wider or narrower nip, as required, in order to control the thickness of the asphalt layer or allow space for a larger number of component layers of the multilayer strip.
Two or more pairs of rollers may act downstream in order to add further polyethylene web layers and asphalt layers to the simple initial three layer strip to form a multilayer strip of the required number of layers.
According to one process embodying the invention, the rollers operate partially submerged in water in order to create around their periphery a water film which is applied to the roller contacting surface of the respective polyethylene web layer for cooling thereof.
The rollers may be cooled by internal circulation of water flowing through suitable means fitted to their axial support points.
Further objects and features of the invention will be disclosed in detail in the following description, with reference to the attached illustrative drawings wherein:
Figure 1 is a diagrammatic side elevation of one cm~)~)dilnent of a device fc>r the manufacturc Or multilayer strips according to the invention; and Figure 2 is a top plan view of the device of Figure 1.
In the process illustrated in the figures, two layers lA and lB of polyethylene web, being fed from respective reels 2A and 2B, partially wrap cylindrical rollers 3A and 3B which 1()7~17~
are disposed in parallel and rotate in opposite directions sothat the polyethylene webs converge in a downward direction.
Said rollers 3A and 3B rotate on shafts 4A and ~ connected to relative drive means.
Disposed above the rollers 3A and 3B there is an asphalt mixture applicator box 5 which, in its simplest form, comprises two end walls 5A, the two rotating rollers 3A and 3B
enclosing the open bottom side of the box. A molten asphalt mixture 6 containing 65/70% asphalt, 2S/30% slate shale and 5/10~ latex or latex-type elastomer is poured into the box 5 from a feed source 7 and is distributed over the nip between the rollers and roller wrapping webs lA and lB. Alternatively two series of rollers arranged parallel to the polyethylene webs for transfer of the asphalt mixture thereto could be used.
Thereafter the combined rotation and compression of the cylindrical rollers 3A and 3B creates a pressure against the polyethylene web strips lA and lB and the asphalt mixture layer 6 sandwiched therebetween to form the simplest, three-layer construction of the multilayer strip.
The thickness of the asphalt layer 6 is adjusted as required between 1 and 4 mm by increasing or reducing the nip dimension between rollers 3A and 3B by way of suitable adjustment ~07~17~
means attached thereto.
The multilayer strip is submerged in water 9 contained in a tray 10. The cylindrical rollers 3A and 3B are partially submerged in the water 9, whereby they pick up a water film on their external surfaces and which is transferred to the roller contacting surfaces of the polyethylene web strips lA and 1~.
The wetted rollers 3A and 3B first contact the polyethylene webs 1A and 1~ respectively at points located 30 cm. (measured along the lengths of the webs) ahead of the places where the webs 1A and 1B are first contacted by the hot asphalt mixture.
This arrangement is nece~ssary to prevent the heat of the molten asphalt mixture 6 from causing deterioration of the polyethylene webs 1~ and 1~ which are readly damaged by such heat.
The purpose of passing the multilayer strip 8 through the water 9 is to complete cooling and stabilization of the strip. In order to aid in the above cooling action, the invention also contemplates having water circulate in the interiors of the cylindrical rollers 3A and 3~, passing thereto through tubular shafts 4A and 4B.
In order to obtain multilayer strips comprising a large number of layers, the initial three-layer strip, formed by two polyethylene web strips, e.g. about 0.012 mm to 0.09 mm thickness and an intermediate asphalt mixture layer, e.g. 4mm in thickness, i9 passed through similar devices in such a way that the three-layer strip and a further polyethylene web are ~ed through each of such de~ices, together with the relati~e intermediate asphalt mixture layer.
The rollers are slightly rough and are 40 cms minimum diameter.
The water is entrained by the rollers and wets each polyethylene web on its radially-inner face 30 cms before it contacts the asphalt at 180C.
~(375~17~
~he water film trapped or insertea between the poly-ethylene webs and the rollers evaporates on contact with the asphalt mixture at 180~. Whereby the double cooling effect is achieved of:
a~ pre~e~ting ~ any further heat increase;
b) increase of cooling effect by absorption of 80 cal/g as the water passes from liquid phase to steam phase.
This completely new system has enabled the use, never achieved before, of a high-pressure, low-density polyethylene film having a melting point of 95C approximately and using even 50 gauge films, equivalent to 0.012 mm, which are the minimum thicknesses currently being manufactured. All this is achieved as the laminate is being manufactured.
In this process the polyethylene web runs right from before the roll nip to the laminate take-up wetted in water, and in this wa~ it is possible to submerge the asphalt mixture at 180C in the water.
The system is really absolutely necessary when, as in the invention, asphalt layer thicknesses of at least 1 to 2 mm is used, since the ratio between the great heat content of the asphalt mixture and the polyethylene material is as high as 200:1.
A further advantage of this process is that when the polyethylene materi21 leaves the process, it has the same physical and chemical properties as before the process, some-thing not achieved with any other existing process.
This process enables the product to be made at speeds of from 40 metres per minute to the unbelievable speed of 1 metre per minute.
It can be added as a differentiating factor that this process is completely continuous from the material entry to winding up and packing.
1()7S~17~
The invention contemplates the use of other forms of the device for making the multilayer strips by the process, among which there is one formed by endless conveyor belts which carry the polyethylene webs to which the layer of asphalt mixture is applied with a doctor blade, with said layers being subjected to a suitable pressure, it being possible to provide a plurality of said layers by using a suitable number of endless belts. The belts are submerged (partially submerged) in water.
Claims (9)
1. Process for the manufacture of multilayer moisture-impermeable strips having at least two very thin continuous flexible plastic layers bonded together by an adhesive medium constituted by a layer of asphast, the thickness of which is a large multiple of the thickness of the plastic layers and is adjustable at will, said process comprising the steps of continuously feeding at least two very thin strips of polyethylene in spaced facing relation to each other to define a space between their facing surface; continuously supplying an asphalt mixture containing 65-70% of asphalt, 25-30% of slate shale and 5-10% of latex or a latex-type elastomer, in a hot molten condition, into such space; continu-ously bonding the very thin strips to the asphalt mixture by supplying pressure to the outer surfaces of the strips to subject the strips and the asphalt mixture to compression to form a three-layer multi-layer moisture-impermeable strip;
simultaneously with such pressure application, and in the zone of pressure application, continuously cooling the very thin strips by conducting heat away from the outer surfaces thereof while the strips are subjected to compression; and thereafter further cooling the multi-layer strip.
simultaneously with such pressure application, and in the zone of pressure application, continuously cooling the very thin strips by conducting heat away from the outer surfaces thereof while the strips are subjected to compression; and thereafter further cooling the multi-layer strip.
2. Process for the manufacture of multilayer moisture-impermeable strips according to claim 1, wherein the two very thin strips of polyethylene are partially wrapped around respective rollers rotating in respective opposite directions to form a nip between the two strips wrapped around the rollers; continuously supplying the hot molten asphalt mixture into the nip; and subjecting the two strips and the asphalt mixture to compression by the two rollers to form a three-layer moisture-impermeable strip.
3. Process for the manufacture of multilayer moisture impermeable strips according to claim 2, wherein the rollers are each partially submerged in water thereby to form a water film on their outer surface which is applied to the roller contacting surface of the associated polyethylene strip for cooling thereof.
4. Process for the manufacture of multilayer moisture impermeable strips according to claim 2, wherein the rollers are cooled by circulation of water to their interior, and passing the water through their axial support points.
5. Process for the manufacture of multilayer moisture impermeable strips according to claim 2, comprising providing at least one additional pair of oppositely rotating rollers downstream of the first-mentioned oppositely rotating rollers;
and feeding, between each pair of additional rollers, the multi-layer strip, hot molten asphalt mixture and an additional very thin strip of the polyethylene for such compression by the additional rollers with such simultaneous cooling of the additional strip and the multi-layer strip, until a multi-layer strip composed of a predetermined number of layers is formed.
and feeding, between each pair of additional rollers, the multi-layer strip, hot molten asphalt mixture and an additional very thin strip of the polyethylene for such compression by the additional rollers with such simultaneous cooling of the additional strip and the multi-layer strip, until a multi-layer strip composed of a predetermined number of layers is formed.
6. Process for the manufacture of multilayer moisture impermeable strips according to claim 5, wherein the nip between each pair of rollers is adjusted as required whereby the desired thickness of asphalt is obtained and the desired number of component layers of the multilayer strip is obtained as required.
7. In the process for the manufacture of multi-layer moisture-impermeable strips having at least two very thin con-tinuous flexible plastic layers bonded together by an adhesive medium constituted by an evenly distributed layer of asphalt, the thickness of which is a large multiple of the thickness of the plastic layers and is adjustable at will, and wherein the layers are bonded together under pressure with the asphalt being applied in the hot molten condition between the layers, the improvement comprising continuously feeding at least two very thin strips of polyethylene in spaced relation to each other to define a space between their facing surfaces by par-tially wrapping the strips around respective rollers rotating in respective opposite directions whereby a nip is formed between the strips partially wrapped around the rollers;
continuously supplying an asphalt mixture containing 65-70%
of asphalt, 25-30% of slate shale and 5-10% of latex or a latex-type elastomer, in a hot molten condition, into said nip;
continuously bonding the very thin polyethylene strips to the hot molten asphalt mixture by applying pressure, through the rollers, to the outer surfaces of the strips to subject the strips and the asphalt mixture to compression to form a three-layer multi-layer moisture-impermeable strip; simultaneously with such pressure application and in the zone of the strips wrapped around the respective rollers, continuously cooling the very thin strips by continuously applying water films to the outer surfaces of the strips in engagement with the rollers, thereby avoiding detrimental alterations to the plastic material of the strips due to the heat given off by the molten asphalt mixture; and thereafter cooling the multi-layer strip by immersing it in a water bath.
continuously supplying an asphalt mixture containing 65-70%
of asphalt, 25-30% of slate shale and 5-10% of latex or a latex-type elastomer, in a hot molten condition, into said nip;
continuously bonding the very thin polyethylene strips to the hot molten asphalt mixture by applying pressure, through the rollers, to the outer surfaces of the strips to subject the strips and the asphalt mixture to compression to form a three-layer multi-layer moisture-impermeable strip; simultaneously with such pressure application and in the zone of the strips wrapped around the respective rollers, continuously cooling the very thin strips by continuously applying water films to the outer surfaces of the strips in engagement with the rollers, thereby avoiding detrimental alterations to the plastic material of the strips due to the heat given off by the molten asphalt mixture; and thereafter cooling the multi-layer strip by immersing it in a water bath.
8. Process according to claim 7, wherein the poly-ethylene layers are of a thickness from about 0.01 mm to about 0.10 mm.
9. Process according to claim 7, wherein the asphalt thickness is of the order of about 4 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA244,955A CA1079171A (en) | 1976-02-03 | 1976-02-03 | Process for the manufacture of multilayer impermeable strips |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA244,955A CA1079171A (en) | 1976-02-03 | 1976-02-03 | Process for the manufacture of multilayer impermeable strips |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1079171A true CA1079171A (en) | 1980-06-10 |
Family
ID=4105146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA244,955A Expired CA1079171A (en) | 1976-02-03 | 1976-02-03 | Process for the manufacture of multilayer impermeable strips |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1079171A (en) |
-
1976
- 1976-02-03 CA CA244,955A patent/CA1079171A/en not_active Expired
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