US3676247A - Corrugating paperboard - Google Patents

Corrugating paperboard Download PDF

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Publication number
US3676247A
US3676247A US4059A US3676247DA US3676247A US 3676247 A US3676247 A US 3676247A US 4059 A US4059 A US 4059A US 3676247D A US3676247D A US 3676247DA US 3676247 A US3676247 A US 3676247A
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US
United States
Prior art keywords
medium
corrugating
corrugated
lubricant
paperboard
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.)
Expired - Lifetime
Application number
US4059A
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English (en)
Inventor
Andrew W Morris
Reginald J Norman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Amcor Pty Ltd
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Australian Paper Manufacturers Ltd
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Filing date
Publication date
Application filed by Australian Paper Manufacturers Ltd filed Critical Australian Paper Manufacturers Ltd
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Publication of US3676247A publication Critical patent/US3676247A/en
Anticipated expiration legal-status Critical
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    • 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
    • B31F1/20—Corrugating; Corrugating combined with laminating to other layers
    • B31F1/24—Making webs in which the channel of each corrugation is transverse to the web feed
    • B31F1/26—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions
    • B31F1/28—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions combined with uniting the corrugated webs to flat webs ; Making double-faced corrugated cardboard
    • B31F1/2804—Methods
    • 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
    • Y10T156/1007—Running or continuous length work
    • Y10T156/1016—Transverse corrugating
    • 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
    • Y10T156/1025—Methods of surface bonding and/or assembly therefor with permanent bending or reshaping or surface deformation of self sustaining lamina to form undulated to corrugated sheet and securing to base with parts of shaped areas out of contact

Definitions

  • ABSTRACT OF THE DISCLOSURE A method of corrugating paperboard at cold (ambient) or intermediate temperatures up to 320 F. but at conventional speeds or higher by treating both sides of the medium prior to corrugation with a lubricant such as a mixture of stearates and paraffin wax so that the coefficient of kinetic friction between the medium and corrugator is less than would be obtained by conventional heat and steam pretreatment.
  • a lubricant such as a mixture of stearates and paraffin wax
  • This invention relates to the corrugating of cardboard, paper and similar deformable materials referred to generally herein as paperboard.
  • Corrugated paperboard and containers made therefrom are widely used in the packaging industry whenever strength, light weight, and economy of construction are needed.
  • the corrugated paperboard is generally formed by corrugating a flat sheet of stiff but inexpensive paper made usually from semi-chemical pulp furnishes usually made on a Fourdrinier machine, and the bonding to one or both sides thereof flat sheets termed liners by means of adhesive placed on the outer ridge of the flutes.
  • the paper used for corrugating is called medium or corrugating medium in the industry.
  • the medium passes into a nip formed by two longitudinally toothed rollers rotating in mesh to form a series of parallel flutes, corrugations or undulations that are generally of substantially constant predetermined amplitude and wavelength.
  • the toothed rollers are normally heated by steam so as to have an operating temperature ranging approximately from 320 F. to 380 F.
  • the medium is also subjected to preheating on a roll, steam heated to from 300 F. to 380 F. approximately and showering with steam on one or both sides before reaching the corrugating rolls in order to render it sufliciently plastic to mould and to accept the corrugating stresses without fracture or malformation of the flutes.
  • US. Pat. 3,103,459 (D. E. Kane) refers to the use of a special grade of polyethylene as a surfactant to increase the runnability of corrugating medium used in the normal corrugating process. Kane considers this to be an improvement on lubricants such as waxes, asphalt and oils which he alleges do not substantially reduce fracturing of the medium and hence allegedly do not increase runnability to satisfactory levels.
  • the present invention relates to a process in which the use of lubricants enables the corrugating to be effected under conditions other than normal i.e. the medium can be corrugated at ambient temperatures but at conventional speeds or higher.
  • the primary effect of the heating and/ or steaming is to cause a lowering of the kinetic friction coefficient between the medium and metal surface of the corrugating rolls.
  • this coefficient is reduced independently of heat or steam e.g. by the application of lubricants, the medium can be corrugated successfully at any desired intermediate temperature level below the range normally employed, even down to ambient temperatures. and that the end product is superior.
  • corrugated paperboard Several types of corrugated paperboard are currently produced for packaging applications. That in which a liner is adhered to one face only of the corrugated medium is termed a single-face corrugated board, and that in which liners are adhered to both faces of the corrugated medium is termed a double-face corrugated board.
  • the liner of the single face corrugated board is usually heated on a steam heated roll on the machine termed the singlefacer or corrugator before being pressed against the corrugated medium to the ridges of which adhesive has been applied.
  • An object of the invention then is to provide for the corrugation of paperboard at speeds in the conventional range and above, even exceeding 1,000 feet per minute, without the need for heating and/or steaming the medium.
  • the present invention provides improvements relating to the manufacture of corrugated paperboard by the method which includes passing a medium in the form of a flat sheet of paperboard through corrugator means adapted to deform the medium into a series of parallel flutes or undulations of predetermined amplitude and wavelength, and securing a flat liner to ridges on one or both surfaces of the corrugated medium to form a singleor double-faced board respectively, characterized in that the corrugation is carried out, without significant fracture, at temperatures from ambient level up to 320 F. but at speeds up to or exceeding 1000 feet per minute, and in that to both surfaces of the medium or portion thereof prior to corrugation is applied a lubricant whereby the coefficient of kinetic friction between the medium and corrugator means is less than 0.22.
  • the figure is a diagrammatic representation of mechanism by which my improved process may be practiced.
  • the web a of material to be corrugated passes over guide rolls 10 and lubricating devies 11 and 11' to the surface of a corrugating roll 12.
  • This roll has teeth 13 meshing with similar teeth 11 on a second corrugating roll 15.
  • the roll 12 is mounted on a bracket 16 pivoted at 17 to a stationary part of the machine and is pressed towards the roll 15 by a compression spring 18.
  • An adhesive applying roll 19 runs in contact with the corrugated paper on roll 15 and applies a film of adhesive such as sodium silicate to the high points of the corrugations.
  • This roll receives adhesive from a supply roll 20 dipping into a tank 21.
  • a lining web b is passed over a roll 22 running adjacent to the surface of roll 15, and is pressed thereby into adhering contact with the corrugated paper.
  • the composite web then passes an adhesive applying roll 23, which receives adhesive from a roll 24 and a tank 25 and applies adhesive to the second side of the corrugated web.
  • the second lining sheet c is passed around a roll 26 3 and is pressed against the corrugated web by this roll and a mating roll 27.
  • Cold-set adhesives that will be used for securing the liner(s) to the corrugated medium at intermediate or at ambient temperatures may be basically of the polyvinyl acetate type or of the polyvinyl alcohol type or any other adhesive requiring little or no heat respectively to cause it to tack or to gel-up as it is termed in the trade.
  • Other adhesives which may be used in the fully cold (i.e. ambient temperature) process or in processing at intermediate temperature levels are the so-called contact adhesives which are usually a natural rubber base or synthetic rubber base. The contact adhesive is applied in the cross machine direction in narrow lines, which may be full or dotted, to either or both the liner and the medium flute tips before the two mating paperboard surfaces are brought into contact or otherwise pressed together.
  • any normal corrugating medium when treated by lightly coating both surfaces with certain materials can be corrugated satisfactorily at maximum existing commercial speeds and above, without the need for heat or steam treatment. It has been found that when both surfaces of the medium are treated with certain lubricants such as stearin or stearates mixed with paraflin wax or similar materials in roughly equal proportions, the paper-to-metal kinetic friction cefficient assumes a value of approximately 0.15. Neither the proportions of the admixture of wax and stearin nor the coating weight applied to the corrugating medium is critical.
  • the required coating weight depends primarily upon the caliper and furnish of the medium used and more particularly upon whether magazine or other coated papers containing clay and fillers have been used as a component of the paper making furnish employed on the machine producing the medium. If the clay or filler content is high,
  • the coating weight per unit area needs to be greater. This can vary from 0.1 pound up to pounds per million square feet of surface area of medium, and although a coating of one pound per million square feet is desirable, some of the tested samples of medium have been capable of cold corrugation with coating weights as low as 0.01 pound per million square feet of surface area.
  • the kinetic friction coefiicient between paper and metal corrugator surface is approximately 0.50 under cold (ambient temperature) conditions.
  • the kinetic friction coefficient assumes a value of approximately 0.22 but on occasions determined by the characteristics of the medium it may rise to approximately 0.28 and causes either malformation or fracturing of the flutes.
  • the fracturing is a tension type failure and is due to the high tension which builds up in the medium on its passage through the toothed labyrinth to the corrugator nip centre whenever the coeflicient is higher than the normal level of approximately 0.22.
  • the lubricant may be applied to the medium at any period during or after its manufacture, as an emulsion in water or in a solvent carrier at the size press or calendar stack of the paper machine or by simply allowing the paper to run over bars of the solid lubricant.
  • the lubricant need not be applied directly to the medium at all, and may instead be applied directly to the corrugator.
  • the most desirable and economical method is to apply the lubricant to the curved tips of the flutes of both corrugating rolls.
  • the lubricant does not need to be applied over substantially the entire surface area of the medium and for preference is applied to the surface protrusions only, since this results in more economical usage of lubricant.
  • both the cold process and the corrugated containers made by the cold process have substantial advantages over the usual hot process and the corrugated containers made by that process.
  • the single facer and double facer machines are complex and expensive, occupy a large floor space area, require boiler attendants and steam generators to produce steam for heating the corrugating rolls, preheating rolls, double facer hotplates and steam showers, require a considerable level of maintenance of steam joints, traps, valves and the like and have a considerable 'warm up period.
  • the corrugated containers made by the hot process also exhibit a considerable number of defects known in the trade as washboarding, warp, blistering and linerlift of the liners together with high-lows (leaning), and fracture of the flutes.
  • New corrugators designed specifically for cold corrugating are simpler, smaller and less costly than existing hot corrugators.
  • the attachment of either or both liners may also be carried out under cold conditions with cold-set or contact adhesives and provided the water uptake from adhesive to liners is limited to a low value no heat is required in the process.
  • the water uptake from adhesive to liners can be limited by selecting an adhesive having a low water content or by lowering the rate of the adhesive application.
  • the water content of polyvinyl acetate base adhesives is about 50% and this is generally found to be a satisfactory level.
  • Some of the contact adhesives have no water. To reduce not only the water uptake but also the cost of the adhesive, the use of gravure or print type adhesive applicator rolls is recommended.
  • auxiliary heating may be required to drive out the excess water. If the corru gating rolls are run cold, such auxiliary heating may be by any known method e.g. hot air or infra red radiation. However the corrugating operation itself is at ambient temperatures.
  • a very important advantage of this invention to the industry is that the existing hot corrugators could be modified without major expenditure to operate at ambient temperatures or at intermediate temperatures up to 320 F.
  • Another known practice involves applying trace quantities of wax or lubricant to one side of the medium in quantities of about pounds per million square feet so that the corrugated medium will not stick in the flutes of the lower corrugating roll.
  • the wax may be applied directly to the lower corrugating roll ie that adjacent to the pressure roll or more usuall to that side of the medium which contacts the aforesaid corrugating roll.
  • An example is disclosed in US. Pat. 1,796,542 of Schoo. Such has been largely replaced in the industry by paraffin oil sprays which direct a very fine oil mist onto the aforesaid corrugating roll from which the corrugating medium must be separated.
  • a process for manufacturing corrugated paperboard at ambient temperatures and at intermediate temperatures up to 320 F. comprising applying a lubricant to a surface of a paperboard medium to bring the coefficient of kinetic friction between the medium and a corrugator means to less than 0.22, passing said medium in the form of a fiat sheet of paperboard through said corrugator means to deform said medium into a series of parallel undulations with ridges of predetermined amplitude and wave length, performing said undulations without significant fracture and securing a flat liner to said ridges on a surface of said corrugated medium to form a faced paperboard.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
  • Paper (AREA)
  • Push-Button Switches (AREA)
US4059A 1969-02-03 1970-01-19 Corrugating paperboard Expired - Lifetime US3676247A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AU4992269 1969-02-03

Publications (1)

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US3676247A true US3676247A (en) 1972-07-11

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US4059A Expired - Lifetime US3676247A (en) 1969-02-03 1970-01-19 Corrugating paperboard

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US (1) US3676247A (enrdf_load_stackoverflow)
JP (1) JPS5233558B1 (enrdf_load_stackoverflow)
CA (1) CA924229A (enrdf_load_stackoverflow)
DE (1) DE2004795C3 (enrdf_load_stackoverflow)
FI (1) FI52955C (enrdf_load_stackoverflow)
FR (1) FR2033848A5 (enrdf_load_stackoverflow)
GB (1) GB1270235A (enrdf_load_stackoverflow)
NL (1) NL7001399A (enrdf_load_stackoverflow)
NO (1) NO132626C (enrdf_load_stackoverflow)
SE (1) SE364217B (enrdf_load_stackoverflow)

Cited By (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3776029A (en) * 1971-12-10 1973-12-04 Paper Chemistry Inst Apparatus and method for testing the runnability of corrugating medium
US3849224A (en) * 1972-07-21 1974-11-19 Westvaco Corp Water resistant corrugated paperboard
US3854861A (en) * 1972-02-22 1974-12-17 Atomic Energy Authority Uk Rollers for shaping sheet material
US3922129A (en) * 1974-05-10 1975-11-25 William V Mcdonald Corrugating system employing controllable steam shower
JPS51106590A (ja) * 1975-03-14 1976-09-21 Tanakaya Co Ltd Katadanshiitoseizohoho
USRE29272E (en) * 1972-07-21 1977-06-21 Westvaco Corporation Water resistant corrugated paperboard
US4140564A (en) * 1976-04-29 1979-02-20 Schrader Edward H Method for corrugating paperboard
US4617076A (en) * 1984-09-17 1986-10-14 Westvaco Corporation Glue applicator for single-faced corrugated web
US4748066A (en) * 1984-10-31 1988-05-31 Digital Equipment Corporation Fire resistant materials
US4764236A (en) * 1987-06-22 1988-08-16 Westvaco Corporation Corrugating machine glue applicator
USH556H (en) 1985-12-02 1988-12-06 Method of manufacture and machine for manufacturing subterranean wall drain
US5389183A (en) * 1992-06-05 1995-02-14 Mitsubishi Jukogyo Kabushiki Kaisha Single-facer
US5766410A (en) * 1996-09-10 1998-06-16 Wu; Shiung Kuang Corrugating machine with an elastic press plate
US20050133643A1 (en) * 2003-12-04 2005-06-23 Fernandez Eric O. Process for increasing the refiner production rate and/or decreasing the specific energy of pulping wood
US20050266166A1 (en) * 2004-05-26 2005-12-01 Halsey Glenn T Method for coating paper machines
US20060091064A1 (en) * 2004-11-02 2006-05-04 Baldwin Filters, Inc. Filter apparatus with separable seal support frame
US20060091061A1 (en) * 2004-11-02 2006-05-04 Baldwin Filters, Inc. Filter assembly with sealing system
US20060091066A1 (en) * 2004-11-02 2006-05-04 Baldwin Fiters Gathered filter media for an air filter and method of making same
US20060225830A1 (en) * 2005-04-12 2006-10-12 Kohler Herbert B Method and apparatus for producing a corrugated product
US20070098887A1 (en) * 2005-10-27 2007-05-03 Kohler Herbert B Method for producing corrugated cardboard
US20070186528A1 (en) * 2006-02-15 2007-08-16 Baldwin Filters, Inc. Fluted filter apparatus
US20070261793A1 (en) * 2004-03-02 2007-11-15 Kohler Herbert B Machine having web tension nulling mechanism
US20080011896A1 (en) * 2004-11-03 2008-01-17 Baldwin Filters, Inc. Method And Apparatus For Winding A Filter Media Pack
US20080135471A1 (en) * 2006-12-06 2008-06-12 Baldwin Filters, Inc. Method and apparatus for winding a filter element
US20080317940A1 (en) * 2007-06-20 2008-12-25 Kohler Herbert B Method for Producing Corrugated Cardboard
US20090114590A1 (en) * 2007-11-01 2009-05-07 Baldwin Filters, Inc. Winding Core Pressure Relief for Fluted Filter
US20090320424A1 (en) * 2008-06-30 2009-12-31 Baldwin Filters, Inc. Filter Frame Attachment and Fluted Filter Having Same
US7753982B2 (en) 2006-02-17 2010-07-13 Baldwin Filters, Inc. Filter with drained jacket, seal indicator/lock means, and seal baffle
US20100181015A1 (en) * 2009-01-22 2010-07-22 Kohler Herbert B Method for moisture and temperature control in corrugating operation
US20100331160A1 (en) * 2008-03-21 2010-12-30 Kohler Herbert B Apparatus for producing corrugated board
US7931725B2 (en) 2004-11-02 2011-04-26 Baldwin Filters, Inc. Fluted filter apparatus
US7959703B2 (en) 2008-06-30 2011-06-14 Baldwin Filters, Inc. Fluted filter with integrated frame
US8206625B2 (en) 2004-11-02 2012-06-26 Baldwin Filters, Inc. Filter element
US8771579B2 (en) 2012-11-01 2014-07-08 Hbk Family, Llc Method and apparatus for fluting a web in the machine direction
US9890750B2 (en) 2004-11-02 2018-02-13 Baldwin Filters, Inc. Filter element
US9970394B2 (en) 2012-07-25 2018-05-15 Baldwin Filters, Inc. Filter housing, fluted filter and safety filter
US10040020B2 (en) 2006-12-06 2018-08-07 Baldwin Filters, Inc. Fluid filter apparatus having filter media wound about a winding frame
US10682597B2 (en) 2016-04-14 2020-06-16 Baldwin Filters, Inc. Filter system
US11118314B2 (en) 2019-08-05 2021-09-14 Intpro, Llc Paper-specific moisture control in a traveling paper web

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5945511B2 (ja) * 1981-08-27 1984-11-07 池田物産株式会社 段ボ−ル製内装材の製造法
JP2024519007A (ja) * 2021-05-17 2024-05-08 ストラ エンソ オーワイジェイ Ｎｓｓｃパルプを含むフルーティングまたはライナー

Cited By (69)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3776029A (en) * 1971-12-10 1973-12-04 Paper Chemistry Inst Apparatus and method for testing the runnability of corrugating medium
US3854861A (en) * 1972-02-22 1974-12-17 Atomic Energy Authority Uk Rollers for shaping sheet material
US3849224A (en) * 1972-07-21 1974-11-19 Westvaco Corp Water resistant corrugated paperboard
USRE29272E (en) * 1972-07-21 1977-06-21 Westvaco Corporation Water resistant corrugated paperboard
US3922129A (en) * 1974-05-10 1975-11-25 William V Mcdonald Corrugating system employing controllable steam shower
JPS51106590A (ja) * 1975-03-14 1976-09-21 Tanakaya Co Ltd Katadanshiitoseizohoho
US4140564A (en) * 1976-04-29 1979-02-20 Schrader Edward H Method for corrugating paperboard
US4278486A (en) * 1976-04-29 1981-07-14 Schrader Edward H Method and apparatus for corrugating paperboard
US4617076A (en) * 1984-09-17 1986-10-14 Westvaco Corporation Glue applicator for single-faced corrugated web
US4748066A (en) * 1984-10-31 1988-05-31 Digital Equipment Corporation Fire resistant materials
USH556H (en) 1985-12-02 1988-12-06 Method of manufacture and machine for manufacturing subterranean wall drain
US4764236A (en) * 1987-06-22 1988-08-16 Westvaco Corporation Corrugating machine glue applicator
US5389183A (en) * 1992-06-05 1995-02-14 Mitsubishi Jukogyo Kabushiki Kaisha Single-facer
US5766410A (en) * 1996-09-10 1998-06-16 Wu; Shiung Kuang Corrugating machine with an elastic press plate
US20050133643A1 (en) * 2003-12-04 2005-06-23 Fernandez Eric O. Process for increasing the refiner production rate and/or decreasing the specific energy of pulping wood
US7726592B2 (en) * 2003-12-04 2010-06-01 Hercules Incorporated Process for increasing the refiner production rate and/or decreasing the specific energy of pulping wood
US20070261793A1 (en) * 2004-03-02 2007-11-15 Kohler Herbert B Machine having web tension nulling mechanism
US7717148B2 (en) 2004-03-02 2010-05-18 Kohler Herbert B Machine having web tension nulling mechanism
US20050266166A1 (en) * 2004-05-26 2005-12-01 Halsey Glenn T Method for coating paper machines
US20060091064A1 (en) * 2004-11-02 2006-05-04 Baldwin Filters, Inc. Filter apparatus with separable seal support frame
US20060091066A1 (en) * 2004-11-02 2006-05-04 Baldwin Fiters Gathered filter media for an air filter and method of making same
US8551375B2 (en) 2004-11-02 2013-10-08 Baldwin Filters, Inc. Filter element
US9932943B2 (en) 2004-11-02 2018-04-03 Baldwin Filters, Inc. Filter element
US7931725B2 (en) 2004-11-02 2011-04-26 Baldwin Filters, Inc. Fluted filter apparatus
US8540790B2 (en) 2004-11-02 2013-09-24 Baldwin Filters, Inc. Filter element
US8277531B2 (en) 2004-11-02 2012-10-02 Baldwin Filters, Inc. Filter element
US8206625B2 (en) 2004-11-02 2012-06-26 Baldwin Filters, Inc. Filter element
US8042694B2 (en) * 2004-11-02 2011-10-25 Baldwin Filters, Inc. Gathered filter media for an air filter and method of making same
US20100000934A1 (en) * 2004-11-02 2010-01-07 Baldwin Filters, Inc. Filter assembly with sealing system
US9890750B2 (en) 2004-11-02 2018-02-13 Baldwin Filters, Inc. Filter element
US20060091061A1 (en) * 2004-11-02 2006-05-04 Baldwin Filters, Inc. Filter assembly with sealing system
US20080011896A1 (en) * 2004-11-03 2008-01-17 Baldwin Filters, Inc. Method And Apparatus For Winding A Filter Media Pack
US7909954B2 (en) 2004-11-03 2011-03-22 Baldwin Filters, Inc. Method and apparatus for winding a filter media pack
US20110011522A1 (en) * 2005-04-12 2011-01-20 Kohler Herbert B Method and apparatus for producing a corrugated product
US20060225830A1 (en) * 2005-04-12 2006-10-12 Kohler Herbert B Method and apparatus for producing a corrugated product
US8057621B2 (en) * 2005-04-12 2011-11-15 Kohler Herbert B Apparatus and method for producing a corrugated product under ambient temperature conditions
US20070098887A1 (en) * 2005-10-27 2007-05-03 Kohler Herbert B Method for producing corrugated cardboard
US20070186528A1 (en) * 2006-02-15 2007-08-16 Baldwin Filters, Inc. Fluted filter apparatus
US7753982B2 (en) 2006-02-17 2010-07-13 Baldwin Filters, Inc. Filter with drained jacket, seal indicator/lock means, and seal baffle
US20080135471A1 (en) * 2006-12-06 2008-06-12 Baldwin Filters, Inc. Method and apparatus for winding a filter element
US10213724B2 (en) 2006-12-06 2019-02-26 Baldwin Filters, Inc. Fluid filter apparatus having filter media wound about a winding frame
US10065146B2 (en) 2006-12-06 2018-09-04 Baldwin Filters, Inc. Method and apparatus for winding a filter element
US10040020B2 (en) 2006-12-06 2018-08-07 Baldwin Filters, Inc. Fluid filter apparatus having filter media wound about a winding frame
US9757676B2 (en) 2006-12-06 2017-09-12 Baldwin Filters, Inc. Method and apparatus for winding a filter element
US20080317940A1 (en) * 2007-06-20 2008-12-25 Kohler Herbert B Method for Producing Corrugated Cardboard
US20090114590A1 (en) * 2007-11-01 2009-05-07 Baldwin Filters, Inc. Winding Core Pressure Relief for Fluted Filter
US9545593B2 (en) 2007-11-01 2017-01-17 Baldwin Filters, Inc. Winding core pressure relief for fluted filter
US10543654B2 (en) 2008-03-21 2020-01-28 Hbk Family, Llc Method for producing corrugated board
US20100331160A1 (en) * 2008-03-21 2010-12-30 Kohler Herbert B Apparatus for producing corrugated board
US11260616B2 (en) 2008-03-21 2022-03-01 Hbk Family, Llc Method for producing corrugated board
US8672825B2 (en) 2008-03-21 2014-03-18 Hbk Family, Llc Apparatus for producing corrugated board
US9649821B2 (en) 2008-03-21 2017-05-16 Hbk Family, Llc Apparatus for producing corrugated board
US7959703B2 (en) 2008-06-30 2011-06-14 Baldwin Filters, Inc. Fluted filter with integrated frame
US8048187B2 (en) 2008-06-30 2011-11-01 Baldwin Filters, Inc. Filter frame attachment and fluted filter having same
US8177877B2 (en) 2008-06-30 2012-05-15 Baldwin Filters, Inc. Filter frame attachment and fluted filter having same
US20090320424A1 (en) * 2008-06-30 2009-12-31 Baldwin Filters, Inc. Filter Frame Attachment and Fluted Filter Having Same
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Also Published As

Publication number Publication date
DE2004795A1 (de) 1970-08-27
FI52955C (enrdf_load_stackoverflow) 1978-01-10
NO132626C (enrdf_load_stackoverflow) 1975-12-10
JPS5233558B1 (enrdf_load_stackoverflow) 1977-08-29
DE2004795C3 (de) 1974-03-07
NO132626B (enrdf_load_stackoverflow) 1975-09-01
CA924229A (en) 1973-04-10
NL7001399A (enrdf_load_stackoverflow) 1970-08-05
FR2033848A5 (enrdf_load_stackoverflow) 1970-12-04
SE364217B (enrdf_load_stackoverflow) 1974-02-18
GB1270235A (en) 1972-04-12
FI52955B (enrdf_load_stackoverflow) 1977-09-30
DE2004795B2 (de) 1973-08-16

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