US20130244854A1 - Apparatus and Method for Folding Film Edges - Google Patents
Apparatus and Method for Folding Film Edges Download PDFInfo
- Publication number
- US20130244854A1 US20130244854A1 US13/868,580 US201313868580A US2013244854A1 US 20130244854 A1 US20130244854 A1 US 20130244854A1 US 201313868580 A US201313868580 A US 201313868580A US 2013244854 A1 US2013244854 A1 US 2013244854A1
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- United States
- Prior art keywords
- film
- folding
- idler roll
- positioning
- guide
- 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.)
- Abandoned
Links
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- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 229920001778 nylon Polymers 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 230000001939 inductive effect Effects 0.000 claims 2
- 230000000712 assembly Effects 0.000 description 9
- 238000000429 assembly Methods 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 7
- 229920006302 stretch film Polymers 0.000 description 6
- 238000009957 hemming Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 239000002699 waste material Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
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- 238000004806 packaging method and process Methods 0.000 description 1
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- 238000003825 pressing Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H18/00—Winding webs
- B65H18/08—Web-winding mechanisms
- B65H18/10—Mechanisms in which power is applied to web-roll spindle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
- B31F1/0003—Shaping by bending, folding, twisting, straightening, flattening or rim-rolling; Shaping by bending, folding or rim-rolling combined with joining; Apparatus therefor
- B31F1/0006—Bending or folding; Folding edges combined with joining; Reinforcing edges during the folding thereof
- B31F1/0009—Bending or folding; Folding edges combined with joining; Reinforcing edges during the folding thereof of plates, sheets or webs
- B31F1/0016—Folding edges; Folding edges combined with joining; Reinforcing edges during the folding thereof, e.g. by introducing a thread; Folding the edges of a sheathing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F7/00—Processes not otherwise provided for
- B31F7/006—Processes not otherwise provided for edges, e.g. sheet edges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H45/00—Folding thin material
- B65H45/12—Folding articles or webs with application of pressure to define or form crease lines
- B65H45/22—Longitudinal folders, i.e. for folding moving sheet material parallel to the direction of movement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2301/00—Handling processes for sheets or webs
- B65H2301/40—Type of handling process
- B65H2301/41—Winding, unwinding
- B65H2301/414—Winding
- B65H2301/4143—Performing winding process
- B65H2301/41432—Performing winding process special features of winding process
- B65H2301/414322—Performing winding process special features of winding process oscillated winding, i.e. oscillating the axis of the winding roller or material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2301/00—Handling processes for sheets or webs
- B65H2301/40—Type of handling process
- B65H2301/41—Winding, unwinding
- B65H2301/414—Winding
- B65H2301/4148—Winding slitting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2701/00—Handled material; Storage means
- B65H2701/10—Handled articles or webs
- B65H2701/11—Dimensional aspect of article or web
- B65H2701/112—Section geometry
- B65H2701/1123—Folded article or web
- B65H2701/11234—C-folded
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2701/00—Handled material; Storage means
- B65H2701/10—Handled articles or webs
- B65H2701/17—Nature of material
- B65H2701/175—Plastic
- B65H2701/1752—Polymer film
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/2419—Fold at edge
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
- Y10T428/2495—Thickness [relative or absolute]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
- Y10T428/31909—Next to second addition polymer from unsaturated monomers
- Y10T428/31913—Monoolefin polymer
Definitions
- the present disclosure generally relates to devices, systems, and methods for producing film in-process for use in the stretch film market.
- the present disclosure relates to devices, systems, and methods for folding the edges of the film, resulting in a film that is less susceptible to damage and easier to use.
- Stretch films are widely used in a variety of bundling and packaging applications. For example, stretch films have become a common method of securing bulky loads such as boxes, merchandise, produce, equipment, parts, and other similar items on pallets. Such films are typically made from various polyethylene resins and may be single or multilayer products. An additive known as a cling agent is frequently used to ensure that adjacent layers of film will cling to each other.
- edges of the film can be easily damaged, which may result in tearing or failure of the film during use.
- the edges of the film are prepared by transversely slitting individual roll widths of film from a wider width of film by means of a conventional sharp edge slitter assembly. Any defects that are introduced into the edges of the film during the slitting process can result in film failure during the application process. Dropping the film roll or any other abuse during handling may also create zones of weakness or tears in the edges of the film.
- One method of reinforcing the edges of the film is to fold the edges of the material to form a hem.
- U.S. Pat. No. 5,565,222 discloses an apparatus for hemming the edges of stretch film.
- the apparatus consists of a first hemming roller with a width less than the width of the film, guide bars located adjacent to the film's path of travel, and a second hemming roller.
- U.S. Pat. No. 5,531,393 discloses a film with folded edges. Folding occurs before the film is stretched and is achieved by means of folding fingers that project inwardly from the side plates of the apparatus.
- edge folds make the film easier to use and reduce waste by making the film less susceptible to failure due to tears, rough handling, or excessive stretching.
- current methods provide for edge folding in a separate and secondary process after the film has been produced, which increases the time and costs of film production.
- methods, systems, and devices which can efficiently fold the edges of the film in-process.
- methods, systems, and devices that can simultaneously fold each edge of multiple widths of film that have been cut from a wider width of film.
- methods, systems, and devices that can re-introduce a fold without operator intervention if the fold is lost due to defects in the film.
- the apparatus comprises a first idler roll, a second idler roll, and a plurality of folding guide assemblies located between the first idler roll and the second idler roll.
- the apparatus may include a nip roll assembly to produce edge folds that are flat.
- a method for folding the edges of a film during the production process comprises the steps of providing a film with edges created by longitudinal slits, a first idler roll, a second idler roll, and a plurality of folding guide assemblies.
- the folding guide assemblies are placed between the first idler roll and the second idler roll.
- the film moves over the first idler roll, through the folding guide assemblies, and over the second idler roll.
- the method may include passing the film through a nip roll assembly to produce edge folds that are flat.
- a film with folded edges produced by the apparatus and method described above is further provided.
- FIG. 1 illustrates the steps for producing film in-process according to an embodiment disclosed herein
- FIG. 2 illustrates the edge folding apparatus and folding guide assembly, with the folding guide assembly comprised of folding rods, according to an embodiment disclosed herein;
- FIG. 3 illustrates the folding guide assembly, with the folding guide assembly comprised of folding rods and re-folders, according to an embodiment disclosed herein;
- FIG. 4 illustrates an edge fold wherein the film is passed through the edge folding apparatus and a nip roll assembly, according to an embodiment disclosed herein;
- FIG. 5 illustrates an edge fold wherein the film is passed through the edge folding apparatus without the nip roll assembly, according to an embodiment disclosed herein.
- the current disclosure includes systems, devices, and methods for producing film in-process for use in the stretch film market. More specifically, according to an embodiment of the disclosure, an apparatus and method are provided for folding the edges of a film in-process.
- the apparatus and method may allow for edge folds on each side of a single width of film.
- the apparatus and method may allow for edge folds on each side of multiple widths of film that have been cut from a wider width of film, thus allowing multiple film rolls to be simultaneously formed from a single wider sheet of film during production. Edge folds may increase the ease of use and reduce waste by making the film less susceptible to failure due to tears, rough handling, or excessive stretching.
- the steps 100 for producing cast film in-process are illustrated. Specifically, the steps comprise producing a film from molten resins 110 , gauging the film 120 , longitudinally slitting the film into multiple sections 130 , folding the edges of the film 140 , oscillating the film 150 , and winding the film onto a film roll 160 in a manner that prevents stacking of the edge folds and entraps air between the layers of film. All of the steps may be performed in-process along a single production line. The steps may be performed in a different order, and one or more steps may be eliminated without departing from the scope of the present disclosure.
- Slitting assemblies are well-known in the field, and the present disclosure may use any conventional slitting assembly to slit the film into multiple sections.
- An interior slit may be defined as a slit made somewhere within the original width of film, resulting in multiple sections of lesser width. Each interior slit may require only one folding guide assembly to accommodate both adjacent film edges.
- An exterior slit may be defined as a slit made along one of the edges of the original width of film. Each exterior edge may require a separate folding guide assembly.
- the edges of the film may be folded immediately after the film is longitudinally slit into multiple sections.
- the edge folds may make the film less susceptible to failure due to tears, rough handling, dropping, or excessive stretching.
- the ability to introduce and maintain edge folds is a key component of film performance.
- the means for folding the edges of the film 210 comprises a first idler roll 220 , a second idler roll 230 , and a plurality of folding guide assemblies 235 also known as folding guides, placed between the first idler roll 220 and the second idler roll 230 .
- Each folding guide assembly 235 may be comprised of steel, aluminum, nylon, or any other material of sufficient modulus to be able to maintain rigidity with no one material demonstrating an advantage.
- Each folding guide assembly may also have a coefficient of friction that allows the edge of the film to turn back on itself, thus introducing a fold.
- the diameter and placement of the folding guide assemblies 235 may be key factors in achieving and maintaining edge folds 250 without roping or wrinkling of the film 210 .
- the folding guide assemblies 235 may be comprised of a plurality of folding rods 240 - 245 , which may be placed in the slits 270 between sections of film 210 to separate the sections of film 210 . After the sections of film 210 are separated, the cling agent and the tension of the film 210 may cause the edge folds 250 to form spontaneously. Each interior folding rod 240 may produce two edge folds 250 , while each exterior folding rod 245 may produce one edge fold 250 .
- the folding rods 240 - 245 may vary from 3 ⁇ 8 inch to 1 inch in diameter, with a preferred diameter of approximately 11/16 inch.
- the folding rods 240 - 245 may have uniform diameter throughout their length.
- the portions of the folding rods 240 - 245 that contact the film 210 may have a smaller diameter or narrow to a point to further aid in separating the sections of film 210 .
- the folding rods 240 - 245 may be placed in the slits 270 between sections of the film 210 at a guide distance 280 and a guide angle 290 .
- the guide distance 280 may be approximately 2 ⁇ 3 of the distance between the first idler roll 220 and the second idler roll 230 , as measured from the point where the film 210 leaves the first idler roll 220 to the point where the film 210 first contacts the folding rods 240 - 245 .
- the guide angle 290 between the film 210 and the folding rods 240 - 245 measured with the folding rods 240 - 245 leaning toward the first idler roll 220 , may vary from 20° to 90°, with a preferred angle of approximately 45°.
- the folding guide assemblies 235 may also be comprised of a plurality of folding rods 240 - 245 and a plurality of re-folders 248 .
- Each folding rod 240 - 245 and each re-folder 248 may be separate units that can be positioned independently. Alternatively, each folding rod 240 - 245 and each re-folder 248 may be combined into a single unit. If the folding rod 240 - 245 and re-folder 248 are combined into a single unit, their positions may be fixed or adjustable relative to each other.
- the re-folders 248 may be placed in the slits 270 between sections of the film 210 after the folding rods 240 - 245 and before the second idler roll 230 .
- the re-folders 248 may function to further separate the sections of film 210 and to direct the film 210 back onto itself at an angle that aids in re-establishing folds 250 that are lost during the production process.
- Causes of lost folds 250 include, but are not limited to, holes, gels, contaminated resins, flaws in the film, and other production problems.
- the composition and diameter of the re-folders 248 may be comparable to that of the folding rods 240 - 245 .
- the re-folders 248 may have uniform diameter throughout their length.
- the portions 249 of the re-folders 248 that contact the film 210 may be wider than the other portions of the re-folders 248 in order to increase the amount of separation between adjacent sections of the film 210 .
- the portions 249 of the re-folders 248 that contact the film 210 may be capped by an inverted cone or sphere.
- the means for folding the edges of the film 210 may also comprise a nip roll assembly 260 .
- the nip roll assembly 260 may consist of two rollers 265 pressed together, and may be primarily intended to control the tension of the film 210 as it passes through the slitting assembly and the edge folding apparatus.
- the nip roll assembly 260 may also aid in pressing the folds 250 into the film 210 , resulting in flat edge folds as shown in FIG. 4 . If the nip roll assembly 260 is not employed, air entrapment may occur within the edge folds as shown in FIG. 5 . Air entrapment within the edge folds may result in a film roll with a different appearance and functionality, much like having bubble wrap on the ends of the roll.
- the film may be oscillated and wound onto film rolls once the film's edges are folded. Oscillation may efficiently distribute the edge folds onto the film roll. In addition, air may be entrapped between the layers of film as the film is wound onto a film roll, making the film easier to unwind and less susceptible to damage.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
- Winding Of Webs (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Packages (AREA)
- Wrappers (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
Abstract
Pre-stretched films may be used to increase the rate at which loads can be wrapped and to minimize the exertion required when using traditional handheld film. However, the edges of pre-stretched films are easily damaged, which may result in tearing or failure of the film during use. The present disclosure describes devices, systems, and methods for folding the edges of the film, resulting in a film that is less susceptible to damage and easier to use.
Description
- The present disclosure generally relates to devices, systems, and methods for producing film in-process for use in the stretch film market. In particular, the present disclosure relates to devices, systems, and methods for folding the edges of the film, resulting in a film that is less susceptible to damage and easier to use.
- Stretch films are widely used in a variety of bundling and packaging applications. For example, stretch films have become a common method of securing bulky loads such as boxes, merchandise, produce, equipment, parts, and other similar items on pallets. Such films are typically made from various polyethylene resins and may be single or multilayer products. An additive known as a cling agent is frequently used to ensure that adjacent layers of film will cling to each other.
- An issue with conventional stretch films is that the edges of the film can be easily damaged, which may result in tearing or failure of the film during use. Typically, the edges of the film are prepared by transversely slitting individual roll widths of film from a wider width of film by means of a conventional sharp edge slitter assembly. Any defects that are introduced into the edges of the film during the slitting process can result in film failure during the application process. Dropping the film roll or any other abuse during handling may also create zones of weakness or tears in the edges of the film.
- One method of reinforcing the edges of the film is to fold the edges of the material to form a hem. For example, U.S. Pat. No. 5,565,222 discloses an apparatus for hemming the edges of stretch film. The apparatus consists of a first hemming roller with a width less than the width of the film, guide bars located adjacent to the film's path of travel, and a second hemming roller. As another example, U.S. Pat. No. 5,531,393 discloses a film with folded edges. Folding occurs before the film is stretched and is achieved by means of folding fingers that project inwardly from the side plates of the apparatus.
- As can be seen, edge folds make the film easier to use and reduce waste by making the film less susceptible to failure due to tears, rough handling, or excessive stretching. However, current methods provide for edge folding in a separate and secondary process after the film has been produced, which increases the time and costs of film production. Thus, there is a need for methods, systems, and devices which can efficiently fold the edges of the film in-process. There is also a need for methods, systems, and devices that can simultaneously fold each edge of multiple widths of film that have been cut from a wider width of film. Finally, there is also a need for methods, systems, and devices that can re-introduce a fold without operator intervention if the fold is lost due to defects in the film.
- An apparatus for folding the edges of a film during the production process is provided. The apparatus comprises a first idler roll, a second idler roll, and a plurality of folding guide assemblies located between the first idler roll and the second idler roll. The apparatus may include a nip roll assembly to produce edge folds that are flat.
- A method for folding the edges of a film during the production process is further provided. The method comprises the steps of providing a film with edges created by longitudinal slits, a first idler roll, a second idler roll, and a plurality of folding guide assemblies. The folding guide assemblies are placed between the first idler roll and the second idler roll. The film moves over the first idler roll, through the folding guide assemblies, and over the second idler roll. The method may include passing the film through a nip roll assembly to produce edge folds that are flat.
- A film with folded edges produced by the apparatus and method described above is further provided.
- These and other features, aspects, and advantages of the present disclosure will become better understood with reference to the following drawings, description, and claims.
- The disclosure will be better understood from the following description and the accompanying drawings given as non-limiting examples, and in which:
-
FIG. 1 illustrates the steps for producing film in-process according to an embodiment disclosed herein; -
FIG. 2 illustrates the edge folding apparatus and folding guide assembly, with the folding guide assembly comprised of folding rods, according to an embodiment disclosed herein; -
FIG. 3 illustrates the folding guide assembly, with the folding guide assembly comprised of folding rods and re-folders, according to an embodiment disclosed herein; -
FIG. 4 illustrates an edge fold wherein the film is passed through the edge folding apparatus and a nip roll assembly, according to an embodiment disclosed herein; and -
FIG. 5 illustrates an edge fold wherein the film is passed through the edge folding apparatus without the nip roll assembly, according to an embodiment disclosed herein. - The following detailed description is of the best currently contemplated modes of carrying out the disclosure. The description is not to be taken in a limiting sense, but is made merely for the purpose of illustrating the general principles of the disclosure, since the scope of the present disclosure is best defined by the appended claims.
- Broadly, the current disclosure includes systems, devices, and methods for producing film in-process for use in the stretch film market. More specifically, according to an embodiment of the disclosure, an apparatus and method are provided for folding the edges of a film in-process. The apparatus and method may allow for edge folds on each side of a single width of film. Alternatively, the apparatus and method may allow for edge folds on each side of multiple widths of film that have been cut from a wider width of film, thus allowing multiple film rolls to be simultaneously formed from a single wider sheet of film during production. Edge folds may increase the ease of use and reduce waste by making the film less susceptible to failure due to tears, rough handling, or excessive stretching.
- Referring generally to
FIG. 1 , thesteps 100 for producing cast film in-process, according to an embodiment of the present disclosure, are illustrated. Specifically, the steps comprise producing a film frommolten resins 110, gauging thefilm 120, longitudinally slitting the film intomultiple sections 130, folding the edges of thefilm 140, oscillating thefilm 150, and winding the film onto afilm roll 160 in a manner that prevents stacking of the edge folds and entraps air between the layers of film. All of the steps may be performed in-process along a single production line. The steps may be performed in a different order, and one or more steps may be eliminated without departing from the scope of the present disclosure. - Slitting assemblies are well-known in the field, and the present disclosure may use any conventional slitting assembly to slit the film into multiple sections. An interior slit may be defined as a slit made somewhere within the original width of film, resulting in multiple sections of lesser width. Each interior slit may require only one folding guide assembly to accommodate both adjacent film edges. An exterior slit may be defined as a slit made along one of the edges of the original width of film. Each exterior edge may require a separate folding guide assembly.
- As shown in
FIG. 1 , the edges of the film may be folded immediately after the film is longitudinally slit into multiple sections. The edge folds may make the film less susceptible to failure due to tears, rough handling, dropping, or excessive stretching. Thus, the ability to introduce and maintain edge folds is a key component of film performance. - As shown in
FIG. 2 , the means for folding the edges of thefilm 210 comprises afirst idler roll 220, asecond idler roll 230, and a plurality offolding guide assemblies 235 also known as folding guides, placed between thefirst idler roll 220 and thesecond idler roll 230. Eachfolding guide assembly 235 may be comprised of steel, aluminum, nylon, or any other material of sufficient modulus to be able to maintain rigidity with no one material demonstrating an advantage. Each folding guide assembly may also have a coefficient of friction that allows the edge of the film to turn back on itself, thus introducing a fold. The diameter and placement of thefolding guide assemblies 235 may be key factors in achieving and maintaining edge folds 250 without roping or wrinkling of thefilm 210. - The
folding guide assemblies 235 may be comprised of a plurality of folding rods 240-245, which may be placed in theslits 270 between sections offilm 210 to separate the sections offilm 210. After the sections offilm 210 are separated, the cling agent and the tension of thefilm 210 may cause the edge folds 250 to form spontaneously. Eachinterior folding rod 240 may produce two edge folds 250, while eachexterior folding rod 245 may produce oneedge fold 250. - The folding rods 240-245 may vary from ⅜ inch to 1 inch in diameter, with a preferred diameter of approximately 11/16 inch. The folding rods 240-245 may have uniform diameter throughout their length. As an alternative, the portions of the folding rods 240-245 that contact the
film 210 may have a smaller diameter or narrow to a point to further aid in separating the sections offilm 210. - The folding rods 240-245 may be placed in the
slits 270 between sections of thefilm 210 at aguide distance 280 and aguide angle 290. Theguide distance 280 may be approximately ⅔ of the distance between thefirst idler roll 220 and thesecond idler roll 230, as measured from the point where thefilm 210 leaves thefirst idler roll 220 to the point where thefilm 210 first contacts the folding rods 240-245. Theguide angle 290 between thefilm 210 and the folding rods 240-245, measured with the folding rods 240-245 leaning toward thefirst idler roll 220, may vary from 20° to 90°, with a preferred angle of approximately 45°. - As shown in
FIG. 3 , thefolding guide assemblies 235 may also be comprised of a plurality of folding rods 240-245 and a plurality ofre-folders 248. Each folding rod 240-245 and each re-folder 248 may be separate units that can be positioned independently. Alternatively, each folding rod 240-245 and each re-folder 248 may be combined into a single unit. If the folding rod 240-245 and re-folder 248 are combined into a single unit, their positions may be fixed or adjustable relative to each other. - The re-folders 248 may be placed in the
slits 270 between sections of thefilm 210 after the folding rods 240-245 and before thesecond idler roll 230. The re-folders 248 may function to further separate the sections offilm 210 and to direct thefilm 210 back onto itself at an angle that aids in re-establishingfolds 250 that are lost during the production process. Causes of lostfolds 250 include, but are not limited to, holes, gels, contaminated resins, flaws in the film, and other production problems. - The composition and diameter of the re-folders 248 may be comparable to that of the folding rods 240-245. The re-folders 248 may have uniform diameter throughout their length. However, as shown in
FIG. 3 , theportions 249 of there-folders 248 that contact thefilm 210 may be wider than the other portions of there-folders 248 in order to increase the amount of separation between adjacent sections of thefilm 210. For example, theportions 249 of there-folders 248 that contact thefilm 210 may be capped by an inverted cone or sphere. - As shown in
FIG. 2 , the means for folding the edges of thefilm 210 may also comprise anip roll assembly 260. Thenip roll assembly 260 may consist of tworollers 265 pressed together, and may be primarily intended to control the tension of thefilm 210 as it passes through the slitting assembly and the edge folding apparatus. Thenip roll assembly 260 may also aid in pressing thefolds 250 into thefilm 210, resulting in flat edge folds as shown inFIG. 4 . If thenip roll assembly 260 is not employed, air entrapment may occur within the edge folds as shown inFIG. 5 . Air entrapment within the edge folds may result in a film roll with a different appearance and functionality, much like having bubble wrap on the ends of the roll. - As shown in
FIG. 1 , the film may be oscillated and wound onto film rolls once the film's edges are folded. Oscillation may efficiently distribute the edge folds onto the film roll. In addition, air may be entrapped between the layers of film as the film is wound onto a film roll, making the film easier to unwind and less susceptible to damage. - From the foregoing, it will be understood by persons skilled in the art that devices, systems, and methods for folding the edges of the film have been provided, resulting in a film that is less susceptible to damage and easier to use. While the description contains many specifics, these should not be construed as limitations on the scope of the present disclosure, but rather as an exemplification of the preferred embodiments thereof. The foregoing is considered as illustrative only of the principles of the present disclosure. Further, because numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the present disclosure to the exact methodology shown and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the present disclosure. Although this disclosure has been described in its preferred form with a certain degree of particularity, it is understood that the present disclosure of the preferred form has been made only by way of example and numerous changes in the details of the method may be resorted to without departing from the spirit and scope of the present disclosure.
Claims (16)
1. A method of folding edges of film in-process, said method comprising:
separating a first idler roll and a second idler roll by a first distance;
positioning a plurality of folding guides between the first idler roll and the second idler roll;
separating adjacent sections of film and inducing two folds with the folding guides, thereby causing an edge of each section of film to turn under 180° and cling to a bottom surface of the section of film; and
moving the adjacent sections of film from the folding guides to the second idler roll.
2. The method of claim 1 , wherein said positioning a plurality of folding guides further comprises positioning a plurality of folding rods.
3. The method of claim 2 , further comprising: positioning a plurality of folding rods having a diameter of between about ⅜-inch and about 1-inch.
4. The method of claim 3 , further comprising: positioning a plurality of folding rods having a diameter of about 11/16-inch.
5. The method of claim 1 , further comprising: positioning the folding guides between the first idler roll and the second idler roll at a predetermined guide distance and a predetermined guide angle.
6. The method of claim 5 , further comprising: positioning the folding guides between the first idler roll and the second idler roll at a guide distance that is about ⅔ of said first distance.
7. The method of claim 5 , further comprising: positioning the folding guides between the first idler roll and the second idler roll at a guide angle of between about 20° and about 90°.
8. The method of claim 1 , further comprising: passing the film through a nip roll assembly after the second idler roll.
9. The method of claim 1 , further comprising: positioning folding guides comprised of a material with sufficient modulus to maintain rigidity.
10. The method of claim 1 , further comprising: positioning folding guides comprised of a material having a coefficient of friction sufficient to introduce edge folds.
11. The method of claim 1 , further comprising: positioning folding guides comprised of a material selected from a group consisting of steel, aluminum and nylon.
12. A method of producing folded edges in a film in-process, said method comprising the steps of:
separating a first idler roll from a second idler roll by a first distance;
positioning at least one folding guide between the first idler roll and the second idler roll, and
separating adjacent sections of film and inducing two folds with the folding guide, thereby causing an edge of each section of film to turn under 180° and cling to a bottom surface of the section of film.
13. The method of claim 12 , further comprising: positioning a folding guide comprised of a material having a coefficient of friction that causes an edge of the film to turn under 180° and cling to a bottom surface of the film.
14. The method of claim 12 , further comprising: positioning the folding guide between the first idler roll and the second idler roll at a predetermined guide distance and a predetermined guide angle.
15. The method of claim 14 , further comprising: positioning the folding guide at a guide distance that is about ⅔ of said first distance.
16. The method of claim 14 , further comprising: positioning the folding guide at a guide angle of between about 20° and about 90°.
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US13/868,580 US20130244854A1 (en) | 2008-07-21 | 2013-04-23 | Apparatus and Method for Folding Film Edges |
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US8239808P | 2008-07-21 | 2008-07-21 | |
US12/470,238 US8221298B2 (en) | 2008-07-21 | 2009-05-21 | Apparatus and method for folding film edges |
US13/490,974 US8475349B2 (en) | 2008-07-21 | 2012-06-07 | Method for folding film edges |
US13/706,088 US8777829B2 (en) | 2008-07-21 | 2012-12-05 | Method for folding film edges |
US13/868,580 US20130244854A1 (en) | 2008-07-21 | 2013-04-23 | Apparatus and Method for Folding Film Edges |
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US13/706,088 Continuation US8777829B2 (en) | 2008-07-21 | 2012-12-05 | Method for folding film edges |
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US12/470,207 Abandoned US20100015422A1 (en) | 2008-07-21 | 2009-05-21 | Oriented Film Produced In-Process for Use in the Stretch Film Market |
US12/470,265 Active 2030-04-02 US8100356B2 (en) | 2008-07-21 | 2009-05-21 | Apparatus and method for winding film onto a film roll |
US13/490,974 Active US8475349B2 (en) | 2008-07-21 | 2012-06-07 | Method for folding film edges |
US13/706,088 Active US8777829B2 (en) | 2008-07-21 | 2012-12-05 | Method for folding film edges |
US13/760,250 Abandoned US20130161860A1 (en) | 2008-07-21 | 2013-02-06 | Oriented Film Produced In-Process For Use in the Stretch Film Market |
US13/868,580 Abandoned US20130244854A1 (en) | 2008-07-21 | 2013-04-23 | Apparatus and Method for Folding Film Edges |
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US12/470,207 Abandoned US20100015422A1 (en) | 2008-07-21 | 2009-05-21 | Oriented Film Produced In-Process for Use in the Stretch Film Market |
US12/470,265 Active 2030-04-02 US8100356B2 (en) | 2008-07-21 | 2009-05-21 | Apparatus and method for winding film onto a film roll |
US13/490,974 Active US8475349B2 (en) | 2008-07-21 | 2012-06-07 | Method for folding film edges |
US13/706,088 Active US8777829B2 (en) | 2008-07-21 | 2012-12-05 | Method for folding film edges |
US13/760,250 Abandoned US20130161860A1 (en) | 2008-07-21 | 2013-02-06 | Oriented Film Produced In-Process For Use in the Stretch Film Market |
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CA (3) | CA2669466C (en) |
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Also Published As
Publication number | Publication date |
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US8100356B2 (en) | 2012-01-24 |
US20100015422A1 (en) | 2010-01-21 |
US8475349B2 (en) | 2013-07-02 |
MX2009007153A (en) | 2010-03-01 |
US8221298B2 (en) | 2012-07-17 |
MX2009007155A (en) | 2010-04-21 |
US20130059715A1 (en) | 2013-03-07 |
US20100012764A1 (en) | 2010-01-21 |
US20130161860A1 (en) | 2013-06-27 |
CA2669504A1 (en) | 2010-01-21 |
CA2669466A1 (en) | 2010-01-21 |
US8777829B2 (en) | 2014-07-15 |
US20130079210A1 (en) | 2013-03-28 |
CA2669466C (en) | 2013-10-22 |
MX2009007154A (en) | 2010-03-24 |
US20100015393A1 (en) | 2010-01-21 |
CA2669502A1 (en) | 2010-01-21 |
CA2669502C (en) | 2014-10-14 |
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Legal Events
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AS | Assignment |
Owner name: PARAGON FILMS, INC., OKLAHOMA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:PIRTLE, SHAUN EUGENE;SHAMSI, KHURRUM;COCHLIN, ROBERT EARL;REEL/FRAME:030268/0139 Effective date: 20090521 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |