WO2014143848A1 - Structures de film striées ayant des caractéristiques visuelles crées par pigment - Google Patents

Structures de film striées ayant des caractéristiques visuelles crées par pigment Download PDF

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Publication number
WO2014143848A1
WO2014143848A1 PCT/US2014/027997 US2014027997W WO2014143848A1 WO 2014143848 A1 WO2014143848 A1 WO 2014143848A1 US 2014027997 W US2014027997 W US 2014027997W WO 2014143848 A1 WO2014143848 A1 WO 2014143848A1
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WO
WIPO (PCT)
Prior art keywords
film
ribs
recited
skin layer
ribbed
Prior art date
Application number
PCT/US2014/027997
Other languages
English (en)
Inventor
Michael G. Borchardt
Theodore J. Fish
Kenneth Cisek
Robert T. Dorsey
Original Assignee
The Glad Products Company
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from US13/838,770 external-priority patent/US9604429B2/en
Application filed by The Glad Products Company filed Critical The Glad Products Company
Priority to CA2923729A priority Critical patent/CA2923729C/fr
Publication of WO2014143848A1 publication Critical patent/WO2014143848A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a non-planar shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/402—Coloured
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/41—Opaque
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/412—Transparent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/414—Translucent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles

Definitions

  • an extruded multilayer film includes a core layer and a pair of skin layers, where one or both of the skin layers are ribbed.
  • a process to form an extruded multilayer film includes coextruding a ribbed outer layer together with a core layer, and subjecting the extruded multilayer film to post-extrusion processing including one or both of MD ring rolling and TD ring rolling, performed in any order.
  • a process to form an extruded multilayer film includes coextruding a ribbed outer layer together with a core layer, and producing one or more indicia in the extruded multilayer film by subjecting the extruded multilayer film to post-extrusion processing including one or both of MD ring rolling and TD ring rolling, performed in any order.
  • manufacturers may form individual films to be coextruded together so as to provide improved strength characteristics using a wide variety of techniques.
  • a manufacturer can form a precursor mix of the thermoplastic material including any optional additives. The manufacturer can then form the film(s) from the precursor mix using conventional flat extrusion, cast extrusion, or coextrusion to produce monolayer, coextruded bilayer, or multilayered films.
  • a manufacturer can form the films using other suitable processes, such as, a blown film process to produce monolayer, bilayer, or multilayered films, which are subsequently discontinuously laminated with another layer at a later stage. If desired for a given end use, the manufacturer can orient the films by trapped bubble, tenterframe, or other suitable processes. Additionally, the manufacturer can optionally anneal the films.
  • the die can be an upright cylinder with a circular opening, and the die may include geometric features about its inner surface that can form various structures on the film as the molten plastic is extruded through the die.
  • a geometric feature is a set of teeth disposed about the inner surface of the die which may cause the formation of ribs on the film as the molten plastic is passed through the die.
  • Figure 1 One example of such a die is disclosed in Figure 1 and discussed in more detail below.
  • rollers can pull molten plastic upward away from the die.
  • An air-ring can cool the film as the film travels upwards.
  • An air outlet can force compressed air into the center of the extruded circular profile, creating a bubble.
  • the air can expand the extruded circular cross section by a multiple of the die diameter. This ratio may be referred to as the "blow-up ratio," or BUR.
  • BUR blow-up ratio
  • the manufacturer can collapse the film to double the plies of the film. Alternatively, the manufacturer can cut and fold the film, or cut and leave the film unfolded.
  • the die 52 may produce a layer that has a substantially smooth outer surface.
  • the inner surface 58 of the annulus 54 may be substantially smooth and free of any discontinuities or other geometric features, while the outer surface 59 of the annulus 54may include one or more elements 60 configured and arranged such that as the molten plastic passes through the die 52, the outer surface of the extruded layer assumes a structure and appearance that corresponds with the configuration and arrangement of the elements 60 of the outer surface 59.
  • the elements 60 comprise grooves having a substantially U-shaped configuration, and the elements 60 are substantially evenly spaced about the outer surface 59so that an extruded film produced by the die 52 includes a ribbed outer surface having ribs extending, for example, in the machine direction, though ribs oriented in other directions may also be produced.
  • the configuration of the ribbed outer surface will reflect the size, number, shape, and spacing of the elements 60.
  • the grooves may have sharp or rounded bottoms and can all be substantially the same size, or different sizes.
  • the starting gauge 252 defined by the distances between its top 254 and bottom surfaces 256.
  • the starting gauge 252, as well as the respective gauges of the individual layers can be substantially uniform along the length of the film 250.
  • such indicia may include indicia that results from the physical contact between the MD machine and/or other post- extrusion processing machines and portions of the film 250, such as the ribs 251, and such indicia may additionally, or alternatively, include color, intensified color, and other effects that result from the stretching of the film 250, such as by the machine 150.
  • the machine 150 includes a pair of
  • Figure 2a discloses that the first roller
  • various parameters of the machine 150 may be selected and implemented depending upon the effect(s) desired to be achieved.
  • the ridge pitch and/or DOE may be varied as necessary.
  • these parameters, and others may be varied however, such variations will not necessarily be evident to one of ordinary skill in the art, and may, in some instances at least, be arrived at only after substantial experimentation and trials.
  • FIGs 2a and 2b details are provided concerning aspects of an example machine and process which may be useful in creating various indicia on a layer, such as a ribbed layer for example.
  • a stretching process such as an MD ring rolling process for example
  • the ridges 156 and 158 may temporarily or permanently compress portions of the ribs 251.
  • the compressions 260 may, but need not, be generally orthogonal to the direction of the ribs 251.
  • the compressions 260 of the ribs 251 constitute one example of indicia, discussed in more detail elsewhere herein.
  • the color, size, number, geometry and orientation of the compressions 260 may depend on one or more of the particular ring rolling process performed, roller pitch, DOE, material(s) of the film, voiding agents, and coloring agents such as pigments and dyes present in one or more layers.
  • MD ring rolling is one example of method suitable to impart indicia to a film, such as a multi-layer film for example, by incremental stretching of the film in the machine direction.
  • TD ring rolling is another suitable method of imparting indicia to a film such as a multi-layer film for example, by incremental stretching of the film in the transverse direction.
  • TD ring rolling like MD ring rolling, may be used alone or in conjunction with other processes.
  • 60b and 60c shapes such as rib shapes, and element combinations 60d, 60e, 60f and 60g which can be employed on the inner and/or outer layers of a film.
  • the elements on opposing sides of the film can be substantially aligned with each other, or staggered relative to each other. It should be noted that the scope of the invention is not limited to those shapes. Moreover, different sizes and configurations of ribs can be combined in a single film.
  • the example process 300 begins at 302 where a core layer resin and a skin layer resin are prepared. This may involve preparing blends for the skin and/or core layers in preparation for an extrusion process. In at least some embodiments, a skin layer blend is prepared that will be used for one or more skin layers.
  • the blend may comprise LLDPE or any other plastic material(s) disclosed herein.
  • one or more coloring agents are added to at least one of the skin layer blend and the core layer blend.
  • a pigment is black, but pigment(s) or other coloring agents of any other color(s) may be used.
  • the pigment may comprise a masterbatch with an LLDPE carrier, such that the pigment can be readily combined with the resin prior to, or subsequent to, the melting of the resin.
  • the coloring agent(s) is/are mixed in to the blend prior to melting of the blend.
  • the colored pellets may be added to the blend(s) prior to melting of the blend(s). Once the coloring agent has been mixed into the blend, the blend can then be melted and extruded, as explained below.
  • the process 300 moves to 306 where the skin layer resin and core layer resin are coextruded to form an extruded multilayer film.
  • the skin layer resin and core layer resin are coextruded to form an extruded multilayer film.
  • at least some embodiments provide for the use of a die that includes elements which cause the formation of ribs on the skin layer as the skin layer resin is extruded through the die.
  • the resulting extruded multilayer film may be subjected to various types of post-extrusion processing 308, one example of which is stretching.
  • post-extrusion processing takes place prior to lamination of the extruded multilayer film with any other films.
  • the post-extrusion processing is performed during, or after, the lamination of the extruded multilayer film with one or more other films. More generally, one or more post-extrusion processes may be performed at any, or all, of the aforementioned junctures.
  • the post-extrusion processing may include stretching, examples of which include one or more of MD ring rolling and TD ring rolling, performed in any order.
  • the MD ring rolling is performed prior to the TD ring rolling, but that is not necessary.
  • only MD ring rolling is performed.
  • one or more post- extrusion processes may comprise incremental stretching or other plastic and/or elastic deformation of the extruded, ribbed multilayer film in one or more directions simultaneously, or serially.
  • the post-extrusion processing of the extruded, ribbed multilayer film may result in the formation of various types of indicia in and/or on the ribbed skin layer and/or elsewhere in the extruded, ribbed multilayer film.
  • coloring agents can include pigments such as titanium dioxide
  • One or more implementations of the present invention include films devoid of coloring agents pigments.
  • a suitable coloring agent comprises a black masterbatch which contains carbon black in an LLDPE carrier.
  • concentration of the black masterbatch can be varied depending, for example, upon variables such as the layer in which the masterbatch is to be used, and the presence or not of other colors in the resins that are used to form the other layers of an extruded multilayer film. Accordingly, the scope of the invention is not limited to any particular concentration, or range(s) of concentration, of black masterbatch or any other color(s) of masterbatch.
  • a black masterbatch concentration in a range of about 0.1 percent to about 1.0 percent has been found useful in some embodiments of a skin layer, and a concentration of black masterbatch of about 0.5 percent has been found to be particularly useful in some embodiments of the skin layer.
  • a black masterbatch concentration in a range of about 4.0 percent to about 8.0 percent has been found useful in some embodiments of a core layer where an associated ribbed skin layer contains a voiding agent, and a concentration of black masterbatch of about 6.0 percent has been found to be particularly useful in some embodiments of the core layer, where an associated skin layer contains a voiding agent.
  • the coloring agent used in at least some embodiments is in the form of a masterbatch that includes a plastic carrier, such as an LLDPE carrier for example, the masterbatch can be added to the molten film resin, or melted together with the film resin, prior to extrusion.
  • a plastic carrier such as an LLDPE carrier
  • coloring agents in forms other than masterbatch can additionally, or alternatively, be employed, and the scope of the invention is not limited to any particular color, type, or form of coloring agent.
  • coloring agents in forms other than masterbatch can additionally, or alternatively, be employed, and the scope of the invention is not limited to any particular color, type, or form of coloring agent.
  • coloring agents in forms other than masterbatch can additionally, or alternatively, be employed, and the scope of the invention is not limited to any particular color, type, or form of coloring agent.
  • a layer may have one or more colors, notwithstanding that the layer does not specifically include a coloring agent.
  • such ribs may provide a structure that deforms, thereby producing indicia, when subjected to various ring rolling (R ) processes, such as DD, MD, and/or TD ring rolling.
  • R ring rolling
  • variables such as pitch of ribs, DOE, and/or RR teeth can be adjusted to provide desirable visual effects in the film.
  • FIG. 4a-l through 4d-2 and the corresponding text provide details concerning an example ribbed film laminate structure referred to herein as Film ' A.
  • Film 'A' is an extruded film that comprises three layers of linear low-density polyethylene (LLDPE), having a layer structure of A:B:A, wherein the layer ratio for the three layers is about 20:60:20. That is, the outer two layers, or skin layers, each have a thickness of about 20 percent of the total thickness of Film ⁇ ', while the core layer has a thickness of about 60 percent of the total thickness of Film ⁇ '.
  • Figures 4a- 1 through 4d-2 further show that both the core layer and the skin layers are un-pigmented.
  • the ribs of Film 'A' averaged about 6.5 mils tall, with an average spacing between extruded ribs 403 of about 0.336 inches.
  • the thickness of the web 405 between consecutive extruded ribs 403 was targeted to be about 0.50 mils thick.
  • the extruded ribs 403 appear translucent as a result of their relative thickness, and as a result of its thinness, the web 405 between the extruded ribs 403 appears to be nearly colorless.
  • Film 'A' is disclosed that reflects an absence of post-extrusion processing, such as MD or TD ring rolling. As illustrated, the ribs 403 have a hazy appearance, and the web 405 between the ribs 403 is largely translucent.
  • Figures 4b- 1, 4b -2, 4c-l and 4c-2 further disclose that different effects can be achieved in, for example, the appearance and/or feel of a ribbed film by varying the post-extrusion tools and/or processing employed in connection with the film.
  • Such tools and/or processing can include one or more of DOE, tooth pitch, tooth shape, and ring rolling including one or more of TD, MD and DD ring rolling.
  • Figures 4b- 1, 4b-2, 4c- 1 and 4c-2 disclose an implementation in which Film A' was stretched by an MD process using a 200 pitch tool and a DOE of about 150 mils.
  • Figures 4d-l and 4d-2 disclose the embodiment of Figures 4b-l, 4b-2, 4c-l and 4c-2 after that embodiment was further subjected to a TD ring rolling process with a 40 pitch tool and DOE of about 20 mils.
  • the additional TD ring rolling process produced no substantial change in the haze of the web 405 between the ribs 403.
  • this process produced no substantial color change in the extruded ribs 403 or web 405 between the extruded ribs 403.
  • Figures 5a- 1 and 5a-2 discloses aspect of another film referred to herein as
  • LLDPE linear low-density polyethylene
  • the core layer (or 'B' layer of the A:B:A structure) is un-pigmented, but in contrast with Film A,' the skin layers contain about 20 percent calcium carbonate (CaC0 3 ) masterbatch, a voiding agent.
  • the ribs 503 of Film 'B' average about 6.5 mils tall, with an average spacing between ribs 503 of about 0.336 inches.
  • the thickness of the web 505 between the ribs 503 was targeted to be about 0.50 mils thick.
  • Figure 5b indicates the effect on Film 'B' of the performance of an MD ring rolling process.
  • Figures 5b- 1 and 5b-2 illustrate the effect on Film 'B' after application of an MD ring rolling process using a 200 pitch tool and a DOE of about 150 mils.
  • MD ring rolling and consequent stretching of Film 'B' under these parameters resulted in a relatively hazier appearance of the web 505 between the ribs 503, while the ribs 503 took on a visibly enhanced white color.
  • Figures 5b- 1 and 5b-2 further show that the ribs 503 each comprise a white "stitch" 507 or cross pattern that intermittently crosses each rib 503.
  • Film 'C is an extruded ribbed film that comprises three layers of linear low-density polyethylene (LLDPE), having a layer structure of A:B:A, wherein the layer ratio for the three layers is about 20:60:20.
  • LLDPE linear low-density polyethylene
  • the ribs 603 of Film 'C average about 6.5 mils tall, with an average spacing between ribs 603 of about 0.336 inches.
  • the thickness of the web 605 between the ribs 603 was targeted to be about 0.50 mils thick.
  • Film 'C comprises a black coloring agent that causes the ribs 603 to appear black.
  • Film 'C comprises a core layer (layer B of layer structure A:B:A) that was un-pigmented, albeit with skin layers (layers A of structure A:B:A) that contained a dilute pigment, about 0.5 percent black masterbatch in this example.
  • a dilute pigment having a concentration in the range of about 0.25 percent to about 3.0 percent may provide acceptable results in this and/or other embodiments.
  • concentrations in a range of about 0.25 percent to about 2.0 percent may be useful in some instances, and concentrations in a range of about 0.25 percent to about 1.0 may be particularly useful in some instances.
  • Figures 6b-l and 6b-2 show the effects of applying an MD stretching process, to the film of Figures 6a- 1 and 6a-2, where the ribs 603 are colored, but otherwise comprise no voiding agents that might change or enhance color with stress.
  • the MD ring rolling was performed using a 200 pitch tool and a DOE of about 150 mils.
  • Figures 6b- 1 and 6b-2 show that applying MD stretching under these parameters can produce some intermittent deformation 607 of the film at uniform points along the ribs 603, and a corresponding hazier appearance of the ribs 603, but otherwise produce no color change to the ribs 603.
  • the web 605 can become hazier as well, but otherwise undergo no color change.
  • Film ⁇ ' is a ribbed film.
  • Film ⁇ ' is an extruded film that comprises three layers of linear low-density polyethylene (LLDPE).
  • LLDPE linear low-density polyethylene
  • Film 'FT has a layer structure of A:B:A. The layer ratio for the three layers is about 20:60:20.
  • the core layer comprised about 6 percent black masterbatch, and the skin layers contained about 20 percent CaC03 masterbatch.
  • the ribs 703 of Film 'FT averaged about 6.5 mils tall, with an average spacing between ribs 703 of about 0.336 inches.
  • the thickness of the intervening film 705 between the ribs 703 was targeted to be about 0.50 mils thick.
  • a TD stretching process with a 40 pitch tool at about 20 mils DOE, performed subsequent to the MD stretching process resulted in no color change to the ribs 703 or to the web 705 between the ribs 703, as compared with the film of Figures 7b- 1 and 7b-2.
  • indicia may include, for example, elements such as colors, dyes, pigments, textures, ribs, corrugations, stars, dots, bars, stitches, discontinuous lines, and combinations of any of the foregoing. Not only are such indicia readily apparent to a user of, for example, an end product in which the discontinuously laminated film structure is employed, but such indicia may be advantageous insofar as they are perceptible by one or more senses of a user.
  • the indicia may be formed at various different times during the production process.
  • the indicia may be formed by post-extrusion processing of an extruded multilayer film.
  • the indicia may be formed as part of a discontinuous lamination process in which an extruded multilayer film is discontinuously laminated to one or more other layers.
  • indicia may be formed both during post-extrusion processing of an extruded multilayer film, and also during a discontinuous lamination process in which that same extruded multilayer film is discontinuously laminated to one or more other layers.
  • indicia may be present in a particular end product, discontinuously laminated film structure, or precursor film.
  • one type of indicia may convey to a user information concerning an attribute of an end product.
  • Another type of indicia may serve a largely cosmetic or aesthetic purpose.
  • the foregoing and/or other types of indicia may be combined, for example, in a single end product.
  • indicia may indicate visually, and/or in a tactile sense, certain attributes of the end product such as, for example, a relative strength of the product.
  • the extruded ribs present in a precursor film enhance the strength of the precursor film.
  • such extruded ribs also provide a visible and tactile indicator, to a user, of the strength of the film and/or the strength of a discontinuously laminated film structure or end product in which that film is employed.
  • the stars or dots present in some of the 'Structures' noted below serve as an indicator of highly localized stress whitening, such as may be obtained with various combinations of ring rolling processes, such as MD and/or TD ring rolling.
  • the highly localized stress whitening which may result from ring rolling in a direction generally orthogonal to a direction of extruded ribs of a film, can serve as an indicator to a consumer as to the strength of the discontinuously laminated film structure, since the localized stress whitening occurs at points where the extruded ribs are worked by the teeth of a roller.
  • indicia such as localized stress whitening can be localized and controlled using various combinations of dyes, dilute pigments, and various processes such as cold MD and/or TD ring rolling. Indeed, such whitening can be highly localized, if desired, as evidenced by indicia such as the dots and stars disclosed elsewhere herein.
  • stress-sensitive agents such as dyes and pigments can be employed in one or more layers of a discontinuously laminated film structure such that formation of the layers and/or the discontinuously laminated film structure causes a change to the element(s) that include the agent, thereby providing a visible manifestation of induced stress and/or strain.
  • indicia within the scope of this disclosure may be largely cosmetic or aesthetic in nature.
  • MD ring rolling of the extruded ribs in a ribbed precursor film provides an interesting visual effect that may have little to do with the strength or integrity of the precursor film or associated discontinuously laminated film structure.
  • indicia convey to a user information concerning a property of a precursor film, discontinuously laminated film structure, and/or end product
  • indicia are example implementations of means for conveying information perceptible by one or more senses of a user.
  • the indicia disclosed herein are provided solely by way of example, and any other indicia of comparable functionality may alternatively be employed.
  • one or more embodiments of the invention may substantially maintain their color characteristics, notwithstanding temporary or permanent deformation of the film.
  • one or more embodiments of the invention may implement various visual effects, such as coloration, with non-metallic films.
  • one or more embodiments of the invention may implement various visual effects such as coloration without the use of color-generating laminates or layers.
  • one or more embodiments of the invention may provide visual effects such as coloration without requiring user manipulation, such as by bending or delamination for example, with regard to the finished film.
  • one or more embodiments of the invention may implement desired visual effects with discontinuously laminated films, and thus do not require intimate contact between layers.
  • one or more embodiments of the invention may implement desired visual effects with film structures that include at least one ribbed film. Further, one or more embodiments of the invention may realize a relative increase in strength as a result of MD rolling and/or TD rolling of a ribbed precursor film or a laminated film that includes such a rolled precursor film. Moreover, the relative strength of the film and/or of a product that employs the film may be visually indicated to a user by indicia such as a color, contrasting colors, and/or distribution of the color in the film or product.
  • the incremental stretching processes disclosed herein may be advantageous over conventional continuous-stretch processes that do not produce indicia and the other effects noted herein.
  • one or more of the embodiments disclosed herein may be advantageous inasmuch as they possess, or produce, as applicable, indicia using a continuous process.
  • More conventional processes, such as stamping or embossing are not well suited to be implemented in a continuous fashion. Rather, only discrete portions of the film can be stamped or embossed.
  • the present invention may be embodied in other specific forms without departing from its spirit or essential characteristics.
  • the illustrated and described implementations involve non-continuous (i.e., discontinuous or partially discontinuous lamination) to provide the light bonds.
  • the lamination may be continuous.
  • multi film layers could be co-extruded so that the layers have a bond strength that provides for delamination prior to film failure to provide similar benefits to those described above.
  • the described embodiments are to be considered in all respects only as illustrative and not restrictive. All changes that come within the meaning and range of equivalency of the claims are to be embraced within their scope.

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  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

Selon un mode de réalisation à titre d'exemple de l'invention, un film comprend une structure coextrudée ayant à la fois une couche de peau striée extrudée qui comprend une pluralité de stries, et une couche de noyau. Les stries sont espacées par une partie jointive qui est formée d'une seule pièce avec les stries. Le film comprend également un agent de coloration qui est sensiblement plus apparent dans les stries que dans la partie jointive, de telle sorte qu'un contraste de couleur et/ou d'intensité de couleur entre les stries et la partie jointive est visible.
PCT/US2014/027997 2013-03-15 2014-03-14 Structures de film striées ayant des caractéristiques visuelles crées par pigment WO2014143848A1 (fr)

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CA2923729A CA2923729C (fr) 2013-03-15 2014-03-14 Structures de film striees ayant des caracteristiques visuelles crees par pigment

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US13/838,770 2013-03-15
US13/838,770 US9604429B2 (en) 2010-11-16 2013-03-15 Ribbed film structures with pigment created visual characteristics

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Citations (6)

* Cited by examiner, † Cited by third party
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