Method and device for providing longitudinal and lateral stretch control in laminated webs
First Claim
Patent Images
1. An apparatus for laminating a moving web of plastic film material to a moving web of paper material to form a moving web of laminated composite, the film material passing through the apparatus in a continuous longitudinally extending web having an upstream portion entering the apparatus and a downstream portion exiting the apparatus;
- the film material normally being extensibly deformable such that the distance between any two reference points on the film web is stretchably variable prior to lamination;
the apparatus comprising;
(a) paper supply unwind roll means for providing a continuous supply of paper to be laminated;
(b) film supply unwind roll means for providing a continuous supply of film to be laminated;
(c) laminating nip means, for drawingly engaging said film web and said paper web in parallel touching contact whereby each said web is moved at the same web speed, and for bondingly compressing said film web to said paper web to form a laminated composite;
(d) film web lateral stretch control means positioned along said film web between said film supply unwind roll means and said laminating nip means for frictionally engaging said film web and for selectively varying the width of the portion of the film web passing therethrough from a first width at a position where the film web enters said lateral stretch control means to a second width at a position where the film web leaves said lateral stretch control means during continuous movement of the film web from said film unwind roll means through said laminating nip;
(e) film width monitoring means for measuring the width of predetermined portions of said film web at a position downstream from said film web lateral stretch control means and for providing a monitor signal to a signal processing means;
(f) signal processing means for comparing said monitor signal to a predetermined film width value and providing command signals responsive thereto to said film web lateral stretch control means for imparting a selected amount of lateral deformation to said film web whereby said film web is continuously extensibly adjusted to a predetermined width by said lateral stretch control means.
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Accused Products
Abstract
A method and apparatus for monitoring and controlling the longitudinal and lateral deformation and the lateral position of a moving web of plastic film material which is laminated to a moving web of paper material to form a laminated composite.
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Citations
50 Claims
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1. An apparatus for laminating a moving web of plastic film material to a moving web of paper material to form a moving web of laminated composite, the film material passing through the apparatus in a continuous longitudinally extending web having an upstream portion entering the apparatus and a downstream portion exiting the apparatus;
- the film material normally being extensibly deformable such that the distance between any two reference points on the film web is stretchably variable prior to lamination;
the apparatus comprising;(a) paper supply unwind roll means for providing a continuous supply of paper to be laminated; (b) film supply unwind roll means for providing a continuous supply of film to be laminated; (c) laminating nip means, for drawingly engaging said film web and said paper web in parallel touching contact whereby each said web is moved at the same web speed, and for bondingly compressing said film web to said paper web to form a laminated composite; (d) film web lateral stretch control means positioned along said film web between said film supply unwind roll means and said laminating nip means for frictionally engaging said film web and for selectively varying the width of the portion of the film web passing therethrough from a first width at a position where the film web enters said lateral stretch control means to a second width at a position where the film web leaves said lateral stretch control means during continuous movement of the film web from said film unwind roll means through said laminating nip; (e) film width monitoring means for measuring the width of predetermined portions of said film web at a position downstream from said film web lateral stretch control means and for providing a monitor signal to a signal processing means; (f) signal processing means for comparing said monitor signal to a predetermined film width value and providing command signals responsive thereto to said film web lateral stretch control means for imparting a selected amount of lateral deformation to said film web whereby said film web is continuously extensibly adjusted to a predetermined width by said lateral stretch control means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
- the film material normally being extensibly deformable such that the distance between any two reference points on the film web is stretchably variable prior to lamination;
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14. A method of detecting the width of a moving web of material comprising the steps of:
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(a) providing a first set of identical longitudinally spaced indicia having a leading edge and a trailing edge, on one longitudinally extending edge of the moving a web at predetermined distance therefrom and providing a second set of identical indicia on a second longitudinally extending edge of the web at a predetermined distance therefrom in mirror image relationship to the first set of indicia; (b) at a first fixed moitoring point above the first side of the web, measuring the time between the passage of the leading edge and the passage of the trailing edge of a first indicia; (c) substantially simultaneously with step (b), at a second fixed monitoring point above the second side of the web and laterally opposite the first monitoring point, measuring the time between the passage of the leading edge of a second indicia in mirror image relationship with said first indicia and the passage of the trailing edge of the second indicia; (d) simultaneously with steps (b) and (c) measuring the velocity of the web; (e) calculating the longitudinal distance between the detected portion of the leading edge and the detected portion of the trailing edge of said first indicia from the time value of step (b) and the velocity value of step (d); (f) calculating the longitudinal distance between the detected portion of the leading edge and the detected portion of the trailing edge of said second indicia from the time value of step (c) and the velocity value of step (d); (g) determining the lateral distance between the first monitoring point and the first longitudinally extending edge of the web from the calculated longitudinal distance of step (e) and the slopes of the edges of the first indicia; (h) determining the lateral distance between the second monitoring point and the second side of the web from the calculated longitudinal distance of step (f) and the slopes of the edges of the second indicia; (i) determining the width of the film web in the area between the two sets of marks by adding the lateral distance values of the two monitoring points from the respective sides of the web, determined by steps (g) and (h), to the lateral distance between the first and second monitoring points. - View Dependent Claims (15, 16)
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17. A method of laminating paper sheet material in roll form to plastic film sheet material in roll form by use of an adhesive material comprising the steps of:
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mounting a roll of the paper sheet material on a first feed roll; mounting a roll of the film sheet material on a second feed roll; simultaneously, continuously unwinding the roll of paper sheet material and the roll of film sheet material to provide a length of paper sheet material and a length of film sheet material; simultaneously continuously advancing the length of paper sheet material and the length of film sheet material to a laminating station comprising a main roll means and a compression roll means defining a nip area therebetween and an adhesive applying means located adjacent the nip area for laminating the film sheet material to the paper sheet material; continuously applying adhesive material between the paper sheet material and the film material in the nip area; applying pressure to the paper sheet material and the film sheet material and the adhesive material during passage through the nip area to form a fixed lamination; passing the length of film sheet material past adjustable guide means located between the lamination station and the feed roll means and variably adjusting the guide means to laterally stretch the film material passing therethrough; sampling the lateral distance between fixed indicia on the film web downstream of the adjustable guide means and generating a control signal representative of that distance; and adjusting the guide means in accordance with the control signal so as to maintain the width of the film sheet material within a predetermined tolerance. - View Dependent Claims (18, 19, 20, 21)
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22. An apparatus for laminating a moving web of plastic film material to a moving web of paper material to form a moving web of laminated composite, the film material passing through the apparatus in a continuous longitudinally extending web having an upstream portion entering the apparatus and a downstream portion exiting the apparatus;
- the film material normally being extensibly deformable such that the distance between any two reference points on the film web is stretchably variable prior to lamination;
the apparatus comprising;(a) paper supply unwind roll means for providing a continuous supply of paper to be laminated; (b) film supply unwind roll means for providing a continuous supply of film to be laminated; (c) laminating nip means, for drawingly engaging said film web and said paper web in parallel touching contact whereby each said web is moved at the same web speed, and for bondingly compressing said film web to said paper web to form a laminated composite; (d) film web lateral stretch control means positioned along said film web between said film supply unwind roll means and said laminating nip means for frictionally engaging said film web and for selectively varying the width of the portion of the film web passing therethrough from a first width at a position where the film web enters said lateral stretch control means to a second width at a position where the film web leaves said lateral stretch control means during continuous movement of the film web from said film unwind roll means through said laminating nip; (e) film width monitoring means for measuring the width of predetermined portions of said film web at a position downstream from said film web lateral stretch control means and for providing a monitor signal to a signal processing means; (f) film web longitudinal stretch control means positioned along said film web between said film supply unwind roll means and said lamination nip means for frictionally engaging said film web and for selectively varying the length of the portion of said film positioned between said film web longitudinal stretch control means and a cooperating film web engaging nip positioned downstream of said film web longitudinal stretch control means; (g) film length monitoring means for measuring the length of predetermined portions of said film web at a position downstream from said film web longitudinal stretch control means and for providing a length monitor signal to a signal processing means; (h) signal processing means for comparing said monitor signal to a predetermined film width value and providing command signals responsive thereto to said film web lateral stretch control means for imparting a selected amount of lateral deformation to said film web whereby said film web is continuously extensibly adjusted to a predetermined width by said lateral stretch control means, and for comparing said monitor signal to a predetermined film length value and providing command signals responsive thereto to said film web longitudinal stretch control means for impacting a selected amount of longitudinal deformation to said film web whereby the longitudinal dimension of predetermined portions of said film web is continuously extensibly adjusted to a predetermined value. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
- the film material normally being extensibly deformable such that the distance between any two reference points on the film web is stretchably variable prior to lamination;
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37. An apparatus for laminating a moving web of plastic film material to a moving web of paper material to form a moving web of laminated composite, the film material passing through the apparatus in a continuous longitudinally extending web having an upstream portion entering the apparatus and a downstream portion exiting the apparatus;
- the film material normally being extensibly deformable such that the distance between any two reference points on the film web is stretchably variable prior to lamination;
the apparatus comprising;(a) paper supply unwind roll means for providing a continuous supply of paper to be laminated; (b) film supply unwind roll means for providing a continuous supply of film material to be laminated; (c) laminating nip means, for drawingly engaging said film web and said paper web in parallel touching contact whereby each said web is moved at the same web speed, and for bondingly compressing said film web to said paper web to form a laminated composite; (d) film web lateral stretch control means positioned along said film web between said film supply unwind roll means and said laminating nip means for frictionally engaging said film web and for selectively varying the width of the portion of the film web passing therethrough from a first width at a position where the film web enters said lateral stretch control means to a second width at a position where the film web leaves said lateral stretch control means during continuous movement of the film web from said film unwind roll means through said laminating nip; (e) film width monitoring means for measuring the width of predetermined portions of said film web at a position downstream from said film web lateral stretch control means and for providing a width monitor signal to a signal processing means; (f) film web longitudinal stretch control means positioned along said film web between said film supply unwind roll means and said lamination nip means for frictionally engaging said film web and for selectively varying the length of the portion of said film positioned between said film web longitudinal stretch control means and a cooperating film web engaging nip positioned downstream of said film web longitudinal stretch control means; (g) film length monitoring means for measuring the length of predetermined portions of said film web at a position downstream from said film web longitudinal stretch control means and for providing a length monitor signal to a signal processing means; (h) film web lateral positioning means operably associated with said film web at a position proximate said laminating nip means for moving the film web laterally to a selected alignment position; (i) film web lateral position monitoring means for monitoring the lateral position of said film web relative to a predetermined reference position and for providing a lateral position monitor signal to a signal processing means; (j) signal processing means for comparing said width monitor signal to a predetermined film width value and providing command signals responsive thereto to said film web lateral stretch control means for imparting a selected amount of lateral deformation to said film web whereby said film web is continuously extensibly adjusted to a predetermined width by said lateral stretch control means, and for comparing said length monitor signal to a predetermined film length value and providing command signals responsive thereto to said film web longitudinal stretch control means for imparting a selected amount of longitudinal deformation to said film web whereby the longitudinal dimension of predetermined portions of said film web is continuously extensibly adjusted to a predetermined value, and for comparing said lateral position monitor signal to a predetermined value indicative of a lateral alignment position and providing command signals responsive to said comparison to said film web lateral positioning means for laterally shifting said film web to said lateral alignment position whereby the lateral position of said film web is continuously laterally adjusted to said lateral alignment position.
- the film material normally being extensibly deformable such that the distance between any two reference points on the film web is stretchably variable prior to lamination;
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38. An apparatus for laminating a moving web of plastic film material to a moving web of paper material to form a moving web of laminated composite, the film material passing through the apparatus in a continuous longitudinally extending web having an upstream portion entering the apparatus and a downstream portion exiting the apparatus;
- the film material normally being extensibly deformable such that the distance between any two reference points on the film web is stretchably variable prior to lamination;
the apparatus comprising;(a) paper supply unwind roll means for providing a continuous supply of paper to be laminated; (b) film supply unwind roll means for providing a continuous supply of film material to be laminated; (c) laminating nip means, for drawingly engaging said film web and said paper web in parallel touching contact whereby each said web is moved at the same web speed, and for bondingly compressing said film web to said paper web to form a laminated composite; (d) film web longitudinal stretch control means positioned along said film web between said film supply unwind roll means and said lamination nip means for frictionally engaging said film web and for selectively varying the length of the portion of said film positioned between said film web longitudinal stretch control means and a cooperating film web engaging nip positioned downstream of said film web longitudinal stretch control means; (e) film length monitoring means for measuring the length of predetermined portions of said film web at a position downstream from said film web longitudinal stretch control means and for providing a length monitor signal to a signal processing means; (f) film web lateral positioning means operably associated with said film web at a position proximate said laminating nip means for moving the film web laterally to a selected alignment position; (g) film web lateral position monitoring means for monitoring the lateral position of said film web relative to a predetermined reference position and for providing a lateral position monitor signal to a signal processing means; (h) signal processing means for comparing said length monitor signal to a predetermined film length value and providing command signals responsive thereto to said film web longitudinal stretch control means for imparting a selected amount of longitudinal deformation to said film web whereby the longitudinal dimension of predetermined portions of said film web is continuously extensibly adjusted to a predetermined value, and for predetermined value indicative of a lateral alignment position and providing command signals responsive to said comparison to said film web lateral positioning means for laterally shifting said film web to said lateral alignment position whereby the lateral position of said film web is continuously laterally adjusted to said lateral alignment position.
- the film material normally being extensibly deformable such that the distance between any two reference points on the film web is stretchably variable prior to lamination;
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39. An apparatus for laminating a moving web of plastic film material to a moving web of paper material to form a moving web of laminated composite, the film material passing through the apparatus in a continuous longitudinally extending web having an upstream portion entering the apparatus and a downstream portion exiting the apparatus;
- the film material normally being extensibly deformable such that the distance between any two reference points on the film web is stretchably variable prior to lamination;
the apparatus comprising;(a) paper supply unwind roll means for providing a continuous supply of paper to be laminated; (b) film supply unwind roll means for providing a continuous supply of film material to be laminated; (c) laminating nip means, for drawingly engaging said film web and said paper web in parallel touching contact whereby each said web is moved at the same web speed, and for bondingly compressing said film web to said paper web to form a laminated composite; (d) film web lateral stretch control means positioned along said film web between said film supply unwind roll means and said laminating nip means for frictionally engaging said film web and for selectively varying the width of the portion of the film web passing therethrough from a first width at a position where the film web enters said lateral stretch control means to a second width at a position where the film web leaves said lateral stretch control means during continuous movement of the film web from said film unwind roll means through said laminating nip; (e) film width monitoring means for measuring the width of predetermined portions of said film web at a position downstream from said film web lateral stretch control means and for providing a width monitor signal to a signal processing means; (f) film web lateral positioning means operably associated with said film web at a position proximate said laminating nip means for moving the film web laterally to a selected alignment position; (g) film web lateral position monitoring means for monitoring the lateral position of said film web relative to a predetermined reference position and for providing a lateral position monitor signal to a signal processing means; (h) signal processing means for comparing said width monitor signal to a predetermined film width value and providing command signals responsive thereto to said film web lateral stretch control means for imparting a selected amount of lateral deformation to said film web whereby said film web is continuously extensibly adjusted to a predetermined width by said lateral stretch control means, and for comparing said lateral position monitor signal to a predetermined value indicative of a lateral alignment position and providing command signals responsive to said comparison to said film web lateral positioning means for laterally shifting said film web to said lateral alignment position whereby the lateral position of said film web is continuously laterally adjusted to said lateral alignment position.
- the film material normally being extensibly deformable such that the distance between any two reference points on the film web is stretchably variable prior to lamination;
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40. An apparatus for laminating a moving web of plastic film material to a moving web of paper material to form a moving web of laminated composite, the film material passing through the apparatus in a continuous longitudinally extending web having an upstream portion entering the apparatus and a downstream portion exiting the apparatus;
- the film material normally being extensibly deformable such that the distance between any two reference points on the film web is stretchably variable prior to lamination;
the apparatus comprising;(a) paper supply unwind roll means for providing a continuous supply of paper to be laminated; (b) film supply unwind roll means for providing a continuous supply of film material to be laminated; (c) laminating nip means, for drawingly engaging said film web and said paper web in parallel touching contact whereby each said web is moved at the same web speed, and for bondingly compressing said film web to said paper web to form a laminated composite; (d) film web lateral positioning means operably associated with said film web at a position proximate said laminating nip means for moving the film web laterally to a selected alignment position; (e) film web lateral position monitoring means for monitoring the lateral position of said film web relative to a predetermined reference position and for providing a lateral position monitor signal to a signal processing means; (f) signal processing means for comparing said lateral position monitor signal to a predetermined value indicative of a lateral alignment position and providing command signals responsive to said comparison to said film web lateral positioning means for laterally shifting said film web to said lateral alignment position whereby the lateral position of said film web is continuously laterally adjusted to said lateral alignment position. - View Dependent Claims (43)
- the film material normally being extensibly deformable such that the distance between any two reference points on the film web is stretchably variable prior to lamination;
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41. A method of detecting the relative lateral position of a moving web of material comprising the steps of:
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(a) providing a first set of identical longitudinally spaced indicia having a leading edge and a trailing edge, on one longitudinally extending edge of the moving web at a predetermined distance therefrom; (b) at a fixed monitoring point above the first side of the web, measuring the time between the passage of the leading edge and the passage of the trailing edge of a first indicia; (c) simultaneously with steps (b) measuring the velocity of the web; (d) calculating the longitudinal distance between the detected portion of the leading edge and the detected portion of the trailing edge of said first indicia from the time value of step (b) and the velocity value of step (c); (e) determining the lateral distance between the first monitoring point and the first longitudinally extending edge of the web from the calculated longitudinal distance of step (d) and the slopes of the edges of the first indicia.
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42. A method of detecting the alignment error of a moving web of a first material with respect to a moving web of a second material comprising the steps of:
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(a) providing a first set of identical longitudinally spaced indicia having a leading edge and a trailing edge, on one longitudinally extending edge of the first moving web at a predetermined distance therefrom and providing a second set of identical indicia on a second longitudinally extending edge of the second moving web at a predetermined distance therefrom; (b) at a first fixed monitoring point above the first edge of the first web, measuring the time between the passage of the leading edge and the passage of the trailing edge of a first indicia; (c) substantially simultaneously with step (b), at a second fixed monitoring point above the second edge of the second web and laterally opposite the first monitoring point, measuring the time between the passage of the leading edge of a second indicia on the second web and the passage of the trailing edge of the second indicia; (d) simultaneously with steps (b) and (c) measuring the velocity of each web; (e) calculating the longitudinal distance between the detected portion of the leading edge and the detected portion of the trailing edge of said first indicia from the time value of step (b) and the velocity value of step (d); (f) calculating the longitudinal distance between the detected portion of the leading edge and the detected portion of the trailing edge of said second indicia from the time value of step (c) and the velocity value of step (d); (g) determining the lateral distance between the first monitoring point and the first longitudinally extending edge of the first web from the calculated longitudinal distance of step (e) and the slopes of the edges of the first indicia; (h) determining the lateral distance between the second monitoring point and the second side of the second web from the calculated longitudinal distance of step (f) and the slopes of the edges of the second indicia; (i) determining the relative lateral displacement of the first edge at the first web from the second edge of the second web from the lateral distance values of the two monitoring points from the respective sides of the two webs determined by steps (g) and (h), and the known lateral positions of the two monitoring points.
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44. A method of determining certain spacial relationships of a first moving web of material having opposite longitudinally and laterally extending side surface and having first and second laterally opposite, longitudinally extending edges comprising the steps of:
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(a) providing a first set of identical longitudinally spaced indicia, each having a leading edge and a trailing edge with preset different slopes, proximate the first longitudinally extending edge of the moving web at a predetermined lateral distance from said first edge of the web; (b) at a first fixed monitoring point positioned opposite one side surface of the web and proximate the first longitudinally extending edge of the web, detecting the passage of the leading edge and the passage of the trailing edge of a first indicia in the first set of indicia of define a first measuring interval; (c) during said first measuring interval counting the number of pulses produced by an encoder having a pulse frequency proportionate to the web speed; (d) calculating the longitudinal distance between the detected portion of the leading edge and the detected portion of the trailing edge of said first indicia from the number of pulse counted during said first measuring interval; (e) determining the lateral distance between the first fixed monitoring point and the first longitudinally extending edge of the web from the calculated longitudinal distance of step (d) and the slopes of the edges of the first indicia. - View Dependent Claims (45, 46, 47, 48, 49, 50)
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Specification