US20110186210A1 - Heat Sealable Packaging Material with Improved Hot Tack - Google Patents

Heat Sealable Packaging Material with Improved Hot Tack Download PDF

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Publication number
US20110186210A1
US20110186210A1 US13/014,745 US201113014745A US2011186210A1 US 20110186210 A1 US20110186210 A1 US 20110186210A1 US 201113014745 A US201113014745 A US 201113014745A US 2011186210 A1 US2011186210 A1 US 2011186210A1
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Prior art keywords
packaging material
moisture
hot tack
heat seal
substrate
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Abandoned
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US13/014,745
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English (en)
Inventor
John C. Files
Anthony Keith Webb
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Mondi Bags USA LLC
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Individual
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Priority to US13/014,745 priority Critical patent/US20110186210A1/en
Assigned to GRAPHIC PACKAGING INTERNATIONAL, INC. reassignment GRAPHIC PACKAGING INTERNATIONAL, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FILES, JOHN C., WEBB, ANTHONY KEITH
Publication of US20110186210A1 publication Critical patent/US20110186210A1/en
Assigned to BANK OF AMERICA, N.A., AS ADMINISTRATIVE AGENT reassignment BANK OF AMERICA, N.A., AS ADMINISTRATIVE AGENT NOTICE AND CONFIRMATION OF GRANT OF SECURITY INTEREST IN PATENTS Assignors: GRAPHIC PACKAGING INTERNATIONAL, INC.
Assigned to BLUEGRASS/CVI PACKAGING COMPANY, LLC reassignment BLUEGRASS/CVI PACKAGING COMPANY, LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GRAPHIC PACKAGING INTERNATIONAL, INC.
Assigned to GRAPHIC FLEXIBLE PACKAGING, LLC reassignment GRAPHIC FLEXIBLE PACKAGING, LLC CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: BLUEGRASS/CVI PACKAGING COMPANY, LLC
Priority to US14/143,171 priority patent/US9211673B2/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/20—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H19/22—Polyalkenes, e.g. polystyrene
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply
    • 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
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y10T156/1002—Methods of surface bonding and/or assembly therefor with permanent bending or reshaping or surface deformation of self sustaining lamina
    • Y10T156/1036—Bending of one piece blank and joining edges to form article
    • Y10T156/1038—Hollow cylinder article
    • 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
    • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
    • Y10T428/2813—Heat or solvent activated or sealable
    • Y10T428/2817—Heat sealable
    • Y10T428/2826—Synthetic resin or polymer

Definitions

  • Form and fill type packaging machines are commonly used for a variety of packaging applications.
  • a packaging material is typically unwound from a roll, formed into a tube around a mandrel, and the free edges are sealed together (e.g., to form a fin seal).
  • the bottom end of the tube is then sealed together to form an end seal, often using a pair of heated jaws or clamps.
  • the seal is being formed, the items to be packaged are inserted (often dropped) into the package.
  • the newly formed heat seal needs to have sufficient “hot tack” or “hot tack strength” to support the weight of the package contents.
  • packaging materials that provide sufficient hot tack strength, even under rigorous manufacturing conditions. For some applications, there is also a need for such materials to be repulpable.
  • This disclosure is directed generally to various packaging materials, methods of making such packaging materials, and methods of using such packaging materials.
  • the packaging material may generally include a substrate, for example, paper, and a heat seal layer disposed on the substrate.
  • the heat seal layer may comprise one or more polymers or polymeric materials that are capable of forming a heat seal.
  • the heat seal layer may comprise polyvinylidene chloride (PVdC).
  • the packaging material may include (e.g., be provided with) at least about 8 wt % moisture (e.g., water), for example, from about 10 wt % to about 18 wt % moisture.
  • the moisture may be contained substantially within the substrate, although it is contemplated that some moisture may be disposed on or in the heat seal layer.
  • the presence of at least about 8 wt % moisture increases the hot tack of the seal (i.e., the tackiness or strength of a seal immediately after formation but before solidification of the sealing material), as compared with the hot tack of a seal formed from a similar packaging material with less than about 8 wt % moisture.
  • This increase in hot tack may be advantageous for numerous packaging applications, and may be particularly advantageous where low temperature heat sealing is needed, for example, to increase production rates. Additionally, the increase in hot tack may allow a heavier “charge” (i.e., product content) to be dropped into the bag without causing the seal to fail. Further, the presence of at least about 8 wt % moisture has been found to increase the hot tack window of the packaging material, thereby increasing the range of operating conditions that may be used to successfully form a heat seal.
  • the packaging material containing the at least about 8 wt % moisture may be wound into a roll.
  • the packaging material may be used in the formation of various packages, wraps, pouches, or other constructs for containing food items, seeds, or any other item prone to spoilage or leakage.
  • the packaging material may also be repulpable.
  • FIGS. 1-4 are schematic cross-sectional views of exemplary packaging materials.
  • FIGS. 5-9 present the hot tack or heat seal strength data for exemplary packaging materials at various moisture levels.
  • FIG. 1 depicts a schematic cross-sectional view of an exemplary packaging material 100 .
  • the packaging material 100 generally includes a plurality of layers in a substantially facing, contacting relationship with one another.
  • the packaging material 100 may be formed into a package using any suitable process, for example, a conventional form and fill type process.
  • the packaging material 100 includes a substrate 102 and a heat seal layer 104 in a facing relationship with one another.
  • the packaging material also includes a pair of outermost surfaces 106 , 108 opposite one another, in this example, defined by the outermost surfaces of the heat seal layer 104 and substrate 102 , respectively.
  • outermost surface 108 in this example, the exposed surface of the substrate 102
  • outermost surface 106 in this example, the exposed surface of the heat seal layer 104
  • the packaging material may include additional layers, as will be discussed below.
  • the substrate 102 generally comprises a base material from which the packaging material 100 is formed, for example, paper or paperboard.
  • the heat seal layer 104 generally comprises a polymer or polymeric material that is capable of being sealed against (i.e., bonded or joined to) itself or another material in the presence of heat.
  • the heat seal layer 104 may comprise polyvinylidene chloride (PVdC).
  • PVdC polyvinylidene chloride
  • a PVdC heat seal layer 104 may also serve as a barrier layer for reducing the transmission of air, water vapor, and other gases through the packaging material 100 .
  • Examples of PVdC that may be suitable for use with the packaging material 100 include DARAN® SL112, DARAN® SL143, DARAN®SL158, and DARAN® SL159, each of which is available commercially from Owensboro Specialty Polymers (Owensboro, Ky.).
  • the heat seal and barrier properties of such materials as provided by the manufacturer are set forth in Table 1. However, other PVdC polymers and/or other polymers or polymeric materials may be suitable.
  • the packaging material 100 may generally include (e.g., be provided with) at least about 8 wt % moisture (e.g., water), which may generally be bound within (or disposed on) the paper substrate.
  • the packaging material 100 may include from about 10 wt % to about 18 wt % moisture, for example, from about 12 wt % to about 16 wt % moisture.
  • the packaging material 100 may include about 14 wt % moisture.
  • other moisture levels and ranges thereof may be suitable.
  • the moisture content of the packaging material may be less than about 8 wt %, for example, from about 5 to about 7 wt %.
  • a moisture content of at least about 8 wt % may significantly increase the hot tack of the packaging material, as compared with a packaging material containing less than about 8 wt % moisture.
  • the hot tack of a packaging material with a moisture level of at least about 8 wt % may be about 25%, about 30%, about 35%, about 40%, about 45%, about 50%, about 55%, about 60%, about 65%, about 70%, about 75%, about 80%, about 85%, about 90%, about 95%, about 100%, about 105%, about 110%, about 115%, about 120%, about 125%, about 130%, about 135%, about 140%, about 145%, about 150%, about 155%, about 160%, about 165%, about 170%, about 175%, about 180%, about 185%, about 190%, about 195%, or about 200% greater than a similar packaging material with less than about 8 wt % moisture.
  • the additional moisture may make the substrate more pliable, which may then allow the heat seal layer of the packaging material to make better contact with, and adhere to, itself more effectively.
  • the additional moisture may increase the heat transfer from the sealing device to the heal seal layer.
  • a heat seal formed using the present packaging material may remain intact using a heavier product charge (i.e., package contents), and may remain intact over a greater range of temperatures, thereby rendering the packaging material more suitable for a wider range of commercial applications.
  • the present inventors have discovered that the presence of at least about 8 wt % moisture in the packaging material (e.g., within the substrate) has been found to increase the hot tack window of the packaging material.
  • the packaging material may be formed into a package at a wider range of temperatures and/or other operating conditions.
  • a lower polymer coat weight material with a relatively high moisture content can provide a hot tack that is at least equivalent to the hot tack of a packaging material including a higher polymer coat weight material and a relatively low moisture content.
  • the desired level of hot tack may be achieved using less polymer. This may provide a significant cost advantage in many packaging applications.
  • the packaging material 100 is also repulpable and recyclable because the PVdC of the heat seal layer 104 can be readily dissociated from the cellulose fibers of the paper substrate 102 .
  • FIGS. 2-5 illustrate several exemplary variations of the packaging material 100 of FIG. 1 .
  • the various packaging materials 200 , 300 , 400 include features that are similar to the packaging material 100 shown in FIG. 1 , except for variations noted and variations that will be understood by those of skill in the art.
  • the reference numerals of similar features are preceded in the figures with a “2” ( FIG. 2 ), “3” ( FIG. 3 ), or “4” ( FIG. 4 ) instead of a “1”.
  • a polymer layer 210 (e.g., first polymer layer) is disposed between the substrate 202 and heat seal layer 204 (e.g., second polymer layer).
  • Polymer layer 210 may comprise any suitable material and may be provided for any purpose, as needed or desired for a particular packaging application.
  • both polymer layers 204 , 210 may comprise PVdC.
  • the layers 204 , 210 may be configured to impart various attributes to the resulting packaging material 200 .
  • polymer layer 204 may be selected based on its heat seal properties
  • polymer layer 210 may be selected based on its hold out properties and/or barrier properties.
  • both polymers 204 , 210 may be selected based on their heat seal properties. For instance, by selecting two PVdC polymers having different softening temperatures, the range of heat seal temperatures of the packaging material 200 may be effectively broadened, which allows for a greater range of operating conditions on the packaging equipment.
  • polymer layer 210 may comprise DARAN®SL112 and polymer layer 204 may comprise DARAN® SL158 and/or DARAN® SL159.
  • polymer layer 210 may comprise DARAN® SL143 and polymer layer 204 may comprise DARAN® SL158 and/or DARAN® SL159.
  • polymer layer 210 may comprise DARAN® SL112 and polymer layer 204 may comprise DARAN® SL143.
  • polymers that may be suitable for polymer layer 210 include, but are not limited to, ethylene vinyl alcohol (EVOH), barrier fluoropolymer, other readily repulpable materials, or any combination thereof.
  • EVOH ethylene vinyl alcohol
  • barrier fluoropolymer other readily repulpable materials
  • one or primer layers may be used to obtain the desired level of adhesion between the various layers of the packaging material. Numerous other possibilities are contemplated.
  • the packaging material 200 may also be repulped and recycled.
  • the packaging material 300 may also include one or more coatings or layers that modify the surface characteristics of the packaging material. Such layers may generally comprise outermost layers of the packaging material.
  • an anti-blocking layer or coating 312 may be applied to polymer layer 304 , as shown in FIG. 3 .
  • the polymer layer 304 may include an anti-blocking additive or material (e.g., as with DARAN® SL159), so that no additional layer 312 is necessary.
  • a slip modifier 314 e.g., a wax
  • packaging material 300 may also be repulped and recycled.
  • the packaging material 400 includes a polymer layer 410 (which may be similar to polymer layer 210 ) disposed between the substrate 402 and heat seal layer 404 , and a slip modifier 414 (e.g., a wax) (which may be similar to slip modifier 314 ) disposed on the substrate 402 .
  • the slip modifier 414 may define at least a portion of the outermost surface 408 of the packaging material 400 .
  • packaging material 400 may also be repulped and recycled.
  • packaging materials e.g., packaging materials 100 , 200 , 300 , 400
  • exemplary packaging materials e.g., packaging materials 100 , 200 , 300 , 400
  • each packaging material and the layers thereof may vary for each application. Further, any of the various layers described above may be used in any combination, as needed or desired for a particular packaging application. It also will be appreciated that various materials may be used to form each layer of the packaging material, and that each layer may have various basis weights or coat weights, depending on the particular application. Further, layers may be added or omitted as needed or desired for each packaging application.
  • the substrate e.g., substrate 102 , 202 , 302 , 402
  • the substrate may have a basis weight of from about 20 to about 330 lb/ream (lb/3000 sq ft.), for example, from about 40 to about 60 lb/ream, for example, from about 25 to about 45 lb/ream.
  • Other ranges and basis weights are contemplated.
  • the substrate may be flat or extensible. Further, if desired, the substrate may comprise a grease resistant material, for example, a paper or paperboard that is impregnated (or otherwise treated with) a grease resistant chemical, for example, fluorochemical. Alternatively, the paper or paperboard may be coated with one or more grease resistant materials.
  • a grease resistant material for example, a paper or paperboard that is impregnated (or otherwise treated with) a grease resistant chemical, for example, fluorochemical.
  • the paper or paperboard may be coated with one or more grease resistant materials.
  • one or more portions or sides of the substrate may be coated with varnish, clay, or other materials, either alone or in combination.
  • at least the side of the substrate that will form an exterior surface of the package may be coated with a clay coating or other base coating.
  • the coating may then be printed over with product advertising, images, price coding, any other information or indicia, or any combination thereof.
  • the base coating then may be overcoated with a varnish to protect any information printed thereon.
  • Each polymer layer (e.g., polymer layer 104 , 204 , 210 , 304 , 404 , 410 ) independently may have a dry basis weight of from about 1 lb/ream to about 10 lb/ream, for example, about 1 lb/ream, about 1.5 lb/ream, about 2 lb/ream, about 2.5 lb/ream, about 3 lb/ream, about 3.5 lb/ream, about 4 lb/ream, about 4.5 lb/ream, about 5 lb/ream, about 5.5 lb/ream, about 6 lb/ream, about 6.5 lb/ream, about 7 lb/ream, about 7.5 lb/ream, about 8 lb/ream, or any other suitable dry basis weight.
  • the combined dry basis weight of the polymer layers of the particular packaging material may be less than about 20 lb/ream, for example, about 15 lb/ream, about 14 lb/ream, about 13 lb/ream, about 12 lb/ream, about 11 lb/ream, about 10 lb/ream, about 9 lb/ream, about 8 lb/ream, about 7 lb/ream, about 6 lb/ream, about 5 lb/ream, about 4 lb/ream, or any other suitable weight.
  • the heat seal layer (e.g., polymer layer 104 , 204 , 304 , 404 ) may have a basis weight of from about 4 to about 10 lb/ream, for example, about 7 lb/ream
  • the intermediate polymer layer e.g., polymer layer 210 , 410
  • the intermediate polymer layer may have a basis weight of from about 2 to about 8 lb/ream, for example, about 5 lb/ream.
  • other basis weights and ranges are contemplated hereby.
  • any or all of the polymer layers may have an oxygen transmission rate (OTR) as measured using ASTM D3985 of less than about 75 cc/m 2 /day, less than about 60 cc/m 2 /day, less than about 50 cc/m 2 /day, less than about 45 cc/m 2 /day, less than about 30 cc/m 2 /day, less than about 20 cc/m 2 /day, less than about 10 cc/m 2 /day, less than about 1 cc/m 2 /day, or any other suitable OTR or range of OTRs.
  • OTR oxygen transmission rate
  • any or all of the polymer layers e.g., polymer layers 104 , 204 , 210 , 304 , 404 , 410 ) of the particular packaging material may have a water vapor transmission rate (WVTR) as measured using ASTM F1249 of less than about 100 g/m 2 /day, less than about 50 g/m 2 /day, less than about 15 g/m 2 /day, less than about 1 g/m 2 /day, less than about 0.1 g/m 2 /day, less than about 0.05 g/m 2 /day, or any other WVTR or range of WVTRs.
  • WVTR water vapor transmission rate
  • the package may include slits or other features to permit the air to escape after filling the package. This allows a plurality of packages to be packed more efficiently into boxes or other cartons for shipping. In such applications, any measure of barrier properties would pertain only to the areas of the material without such slits.
  • a slip modifying coating or layer may have a coat weight (dry) of less than about 1 lb/ream, for example, from about 0.05 to about 0.8 lb ream, for example, from about 0.1 to about 0.6 lb/ream, for example, from about 0.25 to about 0.5 lb/ream. Other ranges and amounts are contemplated.
  • the various layers of the packaging material may be formed, assembled, and/or joined in suitable manner.
  • the various layers e.g., polymer layers 104 , 204 , 210 , 304 , 404 , 410
  • the substrate e.g., substrate 102 , 202 , 302 , 402
  • the moisture content of the packaging material may then be increased to the desired level using any suitable process.
  • the packaging material may pass through a plurality of coaters or sprayers (or other treater) that apply water to the substrate.
  • coaters or sprayers may depend on the desired level of moisture in the packaging material. In some embodiments, one coater or sprayer may be sufficient, while in other embodiments, two or more coaters or sprayers may be needed to attain the desired moisture content. If desired, one or more of such coaters or sprayers also may be used to apply a slip modifier (e.g., slip modifier 314 , 414 ) to the substrate, either separately from or concurrently with (e.g., blended with) the water used to moisturize the packaging material. Numerous other processes may be used.
  • slip modifier e.g., slip modifier 314 , 414
  • the packaging material may be supplied substantially directly to a conventional form and fill packaging machine or any other suitable manufacturing machine to form a package, or the packaging material (including the at least about 8 wt % moisture) may be formed into a roll that extends around a core, such as a tubular core, either for substantially immediate use or for later use.
  • the packaging material (including the at least about 8 wt % moisture) may then be unwound from the roll and then be supplied to the conventional form and fill packaging machine or any other suitable manufacturing machine.
  • the packaging material may be formed into a tube (or tubular structure) with the heat seal layer facing inwardly, the edges may be joined to one another (e.g., to form a fin seal), and the inwardly facing heat seal layer may be joined to itself (e.g., as opposed panels or faces of the tube, such that a first portion of the heat seal layer is sealed to a second portion of the heat seal layer) to form end seals.
  • the use of at least about 8 wt % moisture in the present packaging material provides increased hot tack and an increased hot tack window relative to similar packaging materials having a lower moisture content.
  • the seals may be formed in the packaging material prior to any substantial drying of the packaging material. Accordingly, each of the above-discussed moisture contents may be applicable to the packaging material immediately after the application of the water thereto, while the packaging material in roll form and/or the packaging material while the seals (e.g., for forming a package such as a bag) are formed therein. Accordingly, provisions may be made that seek to inhibit any undesirable drying of the packaging material.
  • the roll of the packaging material may be wrapped in a protective material (e.g., polymer film), or the like.
  • a protective material e.g., polymer film
  • the packaging machine may be provided with a source of water (e.g., sprayer, roll coater, or other suitable apparatus) for increasing the moisture content of the packaging material prior to forming the packaging material into a package.
  • Various packaging materials were formed on production machinery and evaluated for hot tack at various moisture levels.
  • 43 lb/ream natural Kraft paper was coated with about 7 lb/ream of DARAN® SL112 PVdC and dried at a speed of 800 fpm at a temperature of about 300° F.
  • the coated sheet was then coated with about 5 lb/ream of DARAN® SL159 PVdC and dried at a temperature of about 360° F.
  • the packaging materials were moistened at 750 fpm using a Dahlgren moisturizer using a mixture of 98.7 parts water and 1.3 parts Michemlube 156 (Michelman, Cincinnati, Ohio) applied to the underside of the sheet.
  • the applicator roll speed was varied to produce a range of moisture contents. Moisture was measured on a Moistrex moisture analyzer.
  • the hot tack of the packaging materials was evaluated using ASTM 1921-98 with a Lako Tools SL-10 Hot Tack and Seal Strength Tester (jaw pressure of 60 psi, seal time of 0.25 sec, and seal area of 0.75 square inches) over a temperature range of 210° F. to 310° F. at 20° F. intervals. The results are presented in Table 2 and FIG. 5 .
  • the hot tack of the packaging materials generally increased with moisture content and seal temperature. It will be noted that while this effect has been described herein with PVdC, it will be appreciated that increasing the moisture level of packaging materials including other heat seal layers also may result in an enhanced hot tack.
  • Example 1 Samples of the packaging material formed in Example 1 were evaluated to determine whether the packaging material was repulpable. Despite the presence of the PVdC layers, the polymers separated from the fiber in water and were retained on a 0.010′′ flat screen so that the fibers could be successfully be reformed into paper. This may provide a significant advantage over other packaging materials that are not repulpable.
  • the hot tack temperature window (i.e., the range between the lower and upper self-tack limits) was determined for the material of Example 1 at various moisture levels using a Sencorp Heat Sealer, Model 12ASL/1, fitted with a Hot Tack Attachment with a 200 g weight.
  • a 2 by 4 inch sample was placed into the apparatus and pushed into sealing jaws with the weight supported by hand.
  • the seal conditions were 80 psi and 0.25 sec. As the jaws closed, the weight was released and the sample was removed from the jaws. The width of the seal that was pulled apart by the falling action of the weight was recorded.
  • the material passed the test if less than 0.25 inch of the sealed area separated. The highest and lowest temperature at which the material passed the test defines the hot tack window.
  • Table 3 As indicated in Table 3, the samples including 14.2 wt % moisture had a wider hot tack window than the samples including 9.5 wt %.
  • Various packaging materials were evaluated for hot tack and heat seal strength.
  • a 43 lb/ream TEA-Kraft paper (Spec 2400 from Longview Fibre Paper and Packaging, Inc., Longview Wash.) was coated with about 6-7 lb/ream DARAN® SL112 PVdC and dried. The material was then coated with about 5-6 lb/ream DARAN® SL159 PVdC and dried. The total polymer weight was about 12 lb/ream.
  • the coated paper was then moisturized with water using a Dahlgren moisturizer.
  • the moisturized packaging material was then perforated and again moisturized (on the paper side) with a mixture of 98.7 parts water and 1.3 parts Michemlube 156.
  • the resulting packaging materials were evaluated for hot tack and heat seal strength as described in Example 1. Moisture was measured on a Moistrex moisture analyzer. The results are presented in Tables 4-5 and FIGS. 6-7 , where % A is the percent improvement in hot tack as measured using the average hot tack of the control materials ( ⁇ 8 wt % moisture) and the average of the experimental materials (about 15 wt % moisture).
  • Various packaging materials were evaluated for hot tack and heat seal strength.
  • a 43 lb/ream TEA-Kraft paper (Spec 2400 from Longview Fibre Paper and Packaging, Inc., Longview Wash.) was coated with about 8 lb/ream DARAN® SL112 PVdC, and dried. The resulting material was then coated with about 6 lb/ream DARAN® SL159 PVdC and dried. The total polymer weight was about 14 lb/ream.
  • the coated paper was then moisturized with water using a Dahlgren moisturizer, perforated, and again moisturized (on the paper side) with a mixture of 98.7 parts water and 1.3 parts Michemlube 156.
  • the resulting packaging materials were evaluated for hot tack and heat seal strength as described in Example 1. Moisture was measured on a Moistrex moisture analyzer. The results are presented in Table 6 and FIG. 8 .
  • Various packaging materials were evaluated for hot tack and heat seal strength.
  • a 43 lb/ream TEA-Kraft paper (Spec 2400 from Longview Fibre Paper and Packaging, Inc., Longview Wash.) was coated with about 4-5 lb/ream DARAN® SL112 PVdC, dried, coated with about 3-4 lb/ream DARAN® SL159 PVdC, and dried.
  • the total polymer weight was about 8 lb/ream.
  • the coated paper was then moisturized using a Dahlgren moisturizer.
  • the moisturized packaging material was then perforated and again moisturized (on the paper side) with a mixture of 98.7 parts water and 1.3 parts Michemlube 156 (Michelman).
  • the resulting packaging materials were evaluated for hot tack and heat seal strength as described in Example 2. Moisture was measured on a Moistrex moisture analyzer. The results are presented in Table 7 and FIG. 9 .
  • the hot tack increases with moisture content.
  • the presence of at least about 8 wt % moisture in the packaging material may allow the packaging material to be used under more rigorous conditions.
  • a packaging material according to the present disclosure may be used to form a package with heavier product contents, since the seal is able to withstand the heavier load being dropped into the package. This may provide a significant advantage for many packaging applications.
  • a lower polymer coat weight material with a high moisture content can provide at least equivalent (and in some cases, increased) hot tack to a higher polymer coat weight material with a lower moisture content.
  • joinder references are to be construed broadly and may include intermediate members between a connection of elements and relative movement between elements. As such, joinder references do not necessarily imply that two elements are connected directly and in fixed relation to each other. Further, all percentages herein are weight percentages, unless specified otherwise.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
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US13/014,745 2010-02-01 2011-01-27 Heat Sealable Packaging Material with Improved Hot Tack Abandoned US20110186210A1 (en)

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US20140113790A1 (en) 2014-04-24
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