CA2751012C - Asphalt shingle, roof covering therewith and method of making the same with synchronized adhesive positioning thereon - Google Patents

Abstract

An asphalt shingle is provided, in which a base mat is impregnated with an asphalt material and has headlap and tab portions, with the tab portion being a plurality of tabs separated by slots, with adhesive applied to the top surface of the shingle in the headlap portion and above the upper ends of the slots, but wherein the headlap portion of the shingle has adhesive-free zones above the centers of the tabs. A roof covering is provided with the shingles being in overlying and underlying courses, with shingles in each course being laterally offset and with the adhesive-free zones being such that no adhesive on a shingle in an underlying course is visible through slots of shingles in a next-overlying course. The method of making the asphalt shingles includes applying a substrate to a layer of shingle-forming material, the substrate having indicators at predetermined spaced-apart distances, with the indicators being sensed as the shingle- forming layer is moved along a predetermined path, with adhesive zones being applied to the shingle such that the application of the adhesive zones is synchronized in response to sensing the locations of the indicators, and with the shingle-forming layer then being cut into individual shingles.

Description

ASPHALT SHINGLE, ROOF COVERING THEREWITH AND METHOD OF
MAKING THE SAME WITH SYNCHRONIZED ADIIESIVE POSITIONING
THEREON
Background of the Invention Asphalt shingles have been manufactured for many years by impregnating a web of mat, generally of fiberglass material, with a bitumen, such as asphalt, and applying granules of desired color and/or contrast to that surface of the shingle that would be the upper surface of the shingle when the shingle is in an installed condition on a roof.
Generally, the shingle is constructed to have multiple tabs separated by slots cut inward of the shingle from the lower edges of the tabs, to leave the tabs spaced-apart relative to each other. Sometimes the granules in the headlap or butt portion of the shingle; i.e., above the tabs, are of a darker, less expensive nature, because generally the headlap portion of the shingle will be covered when shingles are laid up on a roof in courses, with shingles in a next-overlying course covering headlap portions of shingles in a next underlying course, and with each overlying course of shingles being staggered longitudinally (leftward or rightward) relative to the next underlying course of shingles.
It is also known in the shingle/roofing art that it is the tab portions of shingles that are weather-exposed in the installed condition, and thereby it is the tabs of shingles that can be lifted up by wind conditions, and that if such tabs are bent upwardly a sufficient amount, they can crack and, if the wind conditions are severe enough, can be blown off the roof.
Accordingly, it is known to provide wind resistance for tabs of shingles that are installed on a roof Such resistance is usually effected by application of adhesive beneath the tab portions of shingles, generally at the lower ends of the tabs, so that the lower ends of the tabs are adhesively secured to headlap portions of shingles in a next-underlying course of field shingles of a roof covering.

Summary of the Invention The present invention is directed to providing an asphalt shingle having a base mat impregnated with an asphalt material and having a headlap portion and a tab portion, with the tab portion comprising a plurality of tabs separated by slots, and with adhesive applied on the top surface of the shingle in the headlap portion above the upper ends of the slots, but wherein the headlap portion of the shingle has adhesive-free zones above the centers of the tabs.
The invention also includes a roof covering of shingles as described immediately above, wherein the shingles of overlying courses are offset longitudinally (leftwardly or righwardly) relative to shingles in a next-underlying course, and wherein the adhesive-free zones in headlap portions of shingles are uncovered by shingles in a next-overlying course, such that no adhesive of a shingle of an underlying course is visible through slots of shingles in a next-overlying course.
This invention is also directed to a method of making an asphalt shingle that includes applying a substrate layer to a layer of shingle-forming material, wherein the substrate layer has indicators at predetermined spaced-apart distances, wherein those indicators are sensed as the shingle-forming layer is moved along a predetermined path and then the placement of adhesive zones onto the headlap portion of the upper surface of the shingle forming layer is synchronized in response to the sensing of the locations of the indicators, and wherein the shingle-forming layer is cut into individual shingles.
Accordingly it is an object of this invention to provide a single layer asphalt shingle as described above, or a multi-layer shingle with slots that go all the way through the multiple layers.
It is another object of this invention to provide a roof covering as described above.
It is a further object of this invention to provide a method of making an asphalt shingle as described above.
It is a further object of this invention to synchronize the slot cutting step of making the shingle in response to the sensing of the indicators on the substrate layer.
It is another object of this invention that the synchronizing step includes changing the relative placement of the adhesive zones in response to the sensing step.

2 Brief Descriptions of the Drawing Figures Fig. 1 is plan view of a shingle in accordance with this invention, showing zones of adhesive present in the headlap portion of the shingle, generally above the slots that separate tabs, and wherein adhesive-free zones are shown in phantom in the headlap portion of the shingle, above the centers of the tabs.
Fig. 2 illustrates an array of two shingles as they would appear if laid up on a roof in courses, with each shingle in a next-overlying course of shingles being longitudinally (leftwardly or rightwardly) offset relative to a shingle in a next-underlying course, such that the adhesive-free zones of shingles in a next-underlying course appear through the slots of shingles in a next-overlying course, such that the adhesive zones of shingles in an underlying course are covered by tabs of shingles in a next-overlying course, and wherein no adhesive in headlap portions of shingles in an underlying course is visible through the slots between tabs of shingles in a next-overlying course.
Fig. 3 is an illustration of a partial roof covering of shingles of the type of Figs. 1 and 2.
Fig. 4 is a schematic illustration of various steps in the method of making a shingle in accordance with this invention, wherein the relative placement of the adhesive zones and the slots is effected by changing the delivery of the shingle-forming layer to the adhesive applicator and the slot cutter.
Fig. 5 is an illustration like that of Fig. 4, but wherein the relative placement of the adhesive zones and the slots is effected by changing the position of the adhesive applicator and slot cutter.
Detailed Descriptions of the Preferred Embodiments Referring now to the drawings in detail, reference is first made to Fig. 1, wherein the shingle 10 of this invention is illustrated in plan view as being comprised of a single layer of shingle material made of an asphalt impregnated mat with granules applied to its top surface 11. It will be understood that the shingle could alternatively be one of multi-layer construction with slots that go through the multiple layers. The shingle 10 has a headlap portion 12 and a tab portion 13.

3 In the embodiment shown, the tab portion 13 is a four-tab shingle having tabs 14, 15, 16 and 17 separated by slots 18 that extend from the lower edge 20 of the shingle, at the lower ends of the tabs, up to the headlap portion 12 of the shingle. It will be understood that the shingle could alternatively be a two tab, a three-tab or a shingle with five or more tabs.
It will be understood that the tabs 14-17 may contain decorative granules of different colors and/or contrasts, as may be desired, and that the headlap portion 12 may have dark granules thereon, as shown, or any other type of granules.
It will also be understood that particulate material, such as sand, mica, or other material may be applied to the underside (not shown) of the shingle 10, as desired.
Adhesive stripes 21, 22 and 23 are shown in the headlap portion 12 of the shingle 10, above the upper ends of the slots 18. In the embodiment shown, the stripes 21-23 are shown in two vertically spaced-apart bands, with a pair of stripes 21, 22 placed at the lower end of the headlap portion 12 of the shingle 10, above the slots 18, but just to the left and right of the slots 18, and that the band of stripes 23 is placed somewhat above the lower band of stripes 21, 22, above the upper ends of the slots 18, with the left and right ends of the stripes 23, leaving adhesive-free zones 24 of a width "D" at the lower end of the headlap portion 12 of the shingle 10, between the stripes 21, 22 and between adjacent stripes 23, just above the center lines 25 (shown in phantom), midway between left and right edges 26, 27 of each of the tabs 14-17. These adhesive-free zones 24 are shown in the form of imaginary lines, as are the center lines 25, in order to depict the portions of the headlap portion 12 of the shingle 10 that will not have adhesive applied thereto during the manufacturing process. It will thus be understood that the adhesive-free zones 24 as well as the center lines 25 would not appear to be visible as phantom lines as shown in Fig. 1, but that the same are shown in phantom in Fig. 1, for illustrative purposes only.
Between the adhesive stripes 21 and 22, there is a space that is free of adhesive, directly above each slot 18. This space is particularly adapted to be a fastening zone, for placement of a fastener, such as a nail, for fastening the shingle 10 to a roof, either manually, or by use of a nailing gun, stapling gun or the like.
With reference now to Fig. 2, it will be seen that a shingle 10, in accordance with this invention is presented as a shingle in an underlying course of shingles, and that other

4 shingles in that same course would be arranged end-to-end. A shingle 10' is shown as representing a shingle in a next-overlying course of shingles, and it will likewise be understood that a plurality of shingles 10 would be laid up in the next-overlying course, end-to-end.
Also, in Fig. 2, it will be seen that the tabs 14'-17' of the shingle 10' are disposed laterally (longitudinally) offset leftward and/or rightward, such that the imaginary center lines 25' are aligned above the slots 18 that separate tabs 14-17 of shingle 10.
In this manner, the tabs 14'-17' of shingles 10' in an overlying course of shingles will cover the adhesive zones 21-23 of shingles in the next-underlying course, leaving no adhesive zones visible through the slots 18' between adjacent tabs 14-17' of shingles 10'.
Also, with reference to Figs. 1 and 2, it will be seen that the adhesive-free zones 24 on the top surface of the headlap portions of the shingles are of at least a length L
corresponding to the length of the slots between tabs, and are at least of a width W
corresponding to the width of the slots between the tabs, to slightly into the headlap region.
In Fig. 3, a building 30 is illustrated, having a roof 31 having a roof covering 32 of shingles in accordance with this invention. In Fig. 3, a plurality of courses 33-39 is illustrated, with alternate courses having their shingles 10 staggered longitudinally (leftwardly or rightvvardly) relative to shingles in a next-underlying course, such that slots 18 of shingles 10 in a next-overlying course are centered above tabs of shingles in a next-underlying course and such that adhesive zones 21-23 in headlap portions of shingles in underlying courses are covered by tabs of shingles in next-overlying courses, leaving no adhesive visible through slots that separate tabs of overlying courses.
With reference now to Fig. 4, it will be seen that a web 45 of base mat is provided, moving along a predetermined path in the direction of the arrow 46, with the web 45 being delivered to a bath 47 of bitumen material, preferably asphalt, in a vessel 48, whereby a roller 50 picks up asphalt and applies it to the mat 45, to be absorbed throughout the mat 45 by being engaged between the lower roller 50 and an upper roller 51, such that asphalt is applied throughout the mat 45, and to its upper surface 52, as well as its lower surface 53.

5 = -The thus impregnated mat 45 is then delivered past a granule applicator 54, having a plurality of granule applicator bins 55, 56, 57, 58 and 60 for applying granules to an upper surface 52 of the impregnated mat 45 by dropping them onto the upper surface 52, in the direction of the arrows 61, such that the granules thus applied will adhere to the upper surface 52 of the impregnated mat 45.
Granules of preferably smaller particulate material in the form of sand, mica or the like may be applied to the undersurface 53, if desired, by any of several conventional means known in the art.
It will be understood that, in the manufacture of a shingle-forming layer 45 in accordance with this invention, the layer may be manufactured in the form of a pair of side-by-side shingle-forming layer portions simultaneously, in accordance with that portion of the disclosure of parallel shingle-forming layers as manufactured.
As the shingle-forming layer moves along its predetermined path as shown in Fig.
4, a roll of substrate 59 is unrolled, as shown, and applied in the direction of the arrow 62 shown in Fig. 4, to meet with the undersurface 53 of the shingle-forming layer 45, prior to the passage of the substrate layer 59 and shingle-forming layer 45 around the roller 63, and then around the roller 65 as shown. The substrate 59 has adhesive on its surface 64, and is applied to the undersurface 53 of the shingle-forming layer 45, such that it will adhere thereto, and that, after the substrate 59 and shingle-forming layer 45 come together around roller 63, they continue as a unit as shown around the roller 65.
A sensor 66, aimed at the undersurface 53 of the shingle-forming layer 45, senses predetermined, spaced-apart indicators (not shown) on the undersurface of the shingle-forming layer 45 as the shingle-forming layer 45 passes thereover, as shown at 67, and transmits that information via transmission line 68, to a controller 70. The controller 70 may be a programmable logic computer (PLC).
The substrate layer that is provided from roll 59 may be in the form of a tape that provides an indication in the form of a physical mark, a magnetic device, an infrared device, a hole, a photocell, that may be read by the sensor 66. The sensor 66 may take on various forms, such as a lightness or darkness detector, a metal or magnetic detection

6 device, a barcode reader, an infrared detection device, a hole detection device, a photocell, a CCD array image reader or any other form of detection device, many of which are well known in the art and which can detect some difference caused by a mark or indicator of various types passing thereby.
The connection 68 between the sensor 66 and the controller 70 can be in the form of a wired connection, a signal line, or a wireless transmission line providing a signal from the sensor 66 to the controller 70, microprocessor, or computer of any type.
The controller 70, in response to detection information received from the sensor 66 sensing information from an indicator, delivers that information via control line 71 to a drive mechanism 72 for a take-up mechanism 73. The drive mechanism 72 can adjust the take-up roller mechanism 73 upwardly or downwardly as shown by the double headed arrow 74 to adjust the delivery of shingle-forming layer 45, to increase or decrease the delivery of the shingle-forming layer after it passes around roller 75, and prior to its passing around roller 76, in order to synchronize the delivery of shingle-forming layer 45 to adhesive applicators 77 of adhesive applicator roller 78 as it rotates in the direction shown by the arrow 79, to pick up adhesive 80 from adhesive vessel 81 and apply it to the surface 52 of the shingle-forming layer 45, as that surface comes into contact with the adhesive applicators 77.
Adhesive is thus applied in the form of stripes 82 prior to the shingle-forming layer passing around the roller 83.
It will be understood that the adhesive that is applied via the applicators 77, while being described as being in the form of stripes, could be in the form of squares, circles, or any other geometric shape as may be desired, and as will function in accordance with this invention, all of which are embraced within the term "adhesive zones" or "adhesive".
After application of the adhesive 82, and as the shingle-forming layer 45 then passes around the roller 83, a doctor blade 84 may contact the adhesive 82, to even out the thickness of adhesive zones.
After passing around the roller 83, the shingle-forming layer continues in its movement along a predetermined path, to pass around roller 85. The controller 70, via control line 86 may control a drive mechanism 87, to move the same upwardly or downwardly as shown by the double headed arrow 88, so that the drive mechanism may

7 adjust the position of a take-up roller mechanism 90, in response to a signal received via the transmission line 68 from the sensor 66, in order to adjust the placement of the shingle-forming layer 45 relative to a slot-cutting roller 91, after delivery of the shingle-forming layer 45 around roller 92.
The slot-cutting roller 91, rotating in the direction of the arrow 93, as shown, may be provided with one or more cutting blades 94, for cutting the slots between adjacent tabs in the shingle-forming layer.
Thus, the take-up mechanisms 72, 73; 87, 90 may be used to synchronize the placement of adhesive zones on a surface of the shingle-forming layer in response to the sensing of the locations of the indicators, and may additionally adjust the placement of the slots such that they are synchronized in response to the sensor 66 sensing the locations of the indicators. In this regard, the synchronizing step includes changing the relative placement of any of the adhesive zones and the slots in response to sensing the locations of the indicators. This changing of the relative placement of the adhesive zones with or without the sensing of the relative placement of the slots can be effected by changing the delivery of the shingle-forming layer to the adhesive applicator, and, if desired, to the slot cutter as shown in Fig. 4.
Thereafter, the shingle-forming layer 45 may be delivered to any of various mechanisms known in the art, such as a looper, a cooler (not shown), and eventually to a cutting roller 95 rotating in the direction of the arrow 96, as shown, with the cutting roller 95 having at least one cutting blade 97 thereon, for cutting individual shingles to desired lengths.
With reference now to Fig. 5, an alternative arrangement is schematically illustrated for changing the relative placement of the adhesive zones, and, if desired, also changing the relative placement of the slots in response to the sensing of indicators. In the arrangement illustrated in Fig. 5, to the extent that components are in common with the arrangement of Fig. 4, the same numerals will be used, and, to the extent that there are differences between the embodiments of Figs. 4 and 5 different numerals will be used, as shown and described.
In the embodiment illustrated in the schematic of Fig. 5, the controller 70, via control line 100 can control the movement of the drive mechanism 101, back or forth as

8 shown by the double headed arrow 102, to effect a change in position of the adhesive applicator 81 relative to the shingle-forming layer 45, as an alternative way of synchronizing the placement of adhesive zones 82 on the shingle-forming layer, by driving the adhesive applicator 81 via drive line 103, as shown. Similarly, the controller 70, via control line 105, can control the movement of the slot cutter 94 through the drive mechanism 106, via drive line 107, for movement of the slot cutter 94 backward or forward as shown by the double-headed arrow 107, for synchronizing the cutting of slots in the shingle-forming layer 45, as an alternative way of changing the relative placement of the slots in response to the sensing of indicators on the shingle-forming layer via the sensor 66.
It will be apparent from the foregoing that various modifications may be made in the details of construction of the shingles, as well as in the methods of manufacture of the shingles of this invention, all within the spirit and scope of the invention as defined in the appended claims.

9

Claims (3)

Claims:

1. A single layer asphalt shingle having upper and lower edges spaced apart transversely and right and left edges spaced apart longitudinally, and comprising:
(a) a base mat impregnated with an asphalt material and having top and bottom surfaces;
(b) a layer of particulate material on the top surface;
(c) the shingle having a headlap portion normally covered and not weather-exposed in an installed condition;
(d) the shingle having a tab portion normally uncovered and weather-exposed in the installed condition;
(e) the tab portion comprising a plurality of tabs having longitudinally spaced apart edges on opposite sides of tab centers and extending from the headlap portion to a lower edge of the shingle;
(f) a plurality of slots of a length L1 and width W1 extending from the lower edge of the shingle to the headlap portion and separating adjacent tabs in spaced-apart relation;
(g) adhesive zones on a top surface of the shingle;
(h) said adhesive zones being in the headlap portion of the shingle in two vertically spaced-apart rows, comprising an upper row and a lower row, wherein each row is comprised of a plurality of spaced-apart zones of adhesive, with adhesive-free zones between the spaced-apart zones of adhesive in each row above the centers of the tabs: and (i) said shingle having on its top surface, said adhesive-free zones, with each of said adhesive-free zones being of at least said transverse length L1 and of at least a said longitudinal width W1 in the headlap portion above the centers of the tabs;
(j) with the lower row of said adhesive zones comprising a plurality of pairs of adhesive strips, with adhesive strips in each pair of strips being laterally spaced apart, leaving a space therebetween above the center of one of said slots that is free of adhesive, to comprise a fastening zone means for placement of a fastener through the shingle headlap portion between strips in each pair of strips, directly above the center of each said slot; with the upper row of said adhesive zones comprising a plurality of laterally spaced-apart upper adhesive strips; each upper adhesive strip extending above the center of one of said slot and above a pair of adjacent tab portions for approximately equal lateral distances; and (k) whereby, when a plurality of said shingles are laid up in courses on a roof, with shingles in the same course being laid with their right and left edges adjacent to right and left edges of other of said shingles and wherein shingles in overlying courses are offset longitudinally relative to shingles in next-underlying courses, with tabs of shingles in overlying courses covering adhesive zones in headlap portions of shingles in next-underlying courses and leaving uncovered the adhesive-free zones in headlap portions of shingles in next-underlying courses, comprising means whereby no adhesive of a shingle of an underlying course is visible through slots of shingles in a next-overlying course.

2. The shingle of claim 1, wherein the adhesive zones are horizontal between right arid left edges of the shingle.

3. A roof covering comprising a plurality of shingles according to any one of claims 1 and 2, laid up in courses on a roof, with shingles in the same course being laid with their right and left edges adjacent to right and left edges of other of said shingles and wherein shingles in overlying courses are offset longitudinally relative to shingles in next-underlying courses, with tabs of shingles in overlying courses covering adhesive zones in headlap portions of shingles in next-underlying courses and leaving uncovered the adhesive-free zones in headlap portions of shingles in next-underlying courses, whereby no adhesive of a shingle of an underlying course is visible through slots of shingles in a next-overlying course; with fasteners through headlap portions of shingles between adhesive strips in each pair of strips in said lower rows of adhesive zones, directly above slots between said tab portions, fastening the shingles to the roof.