US3782067A - Method and apparatus for continuously wrapping flexible sheets - Google Patents

Method and apparatus for continuously wrapping flexible sheets Download PDF

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Publication number
US3782067A
US3782067A US00174807A US3782067DA US3782067A US 3782067 A US3782067 A US 3782067A US 00174807 A US00174807 A US 00174807A US 3782067D A US3782067D A US 3782067DA US 3782067 A US3782067 A US 3782067A
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US
United States
Prior art keywords
web
sheets
folded
margins
wrapping
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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
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US00174807A
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English (en)
Inventor
A Smolderen
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.)
Agfa Gevaert NV
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Agfa Gevaert NV
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
    • B65B9/02—Enclosing successive articles, or quantities of material between opposed webs
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24777—Edge feature

Definitions

  • ABSTRACT In a wrapped film package, particularly sheets of X-ray film, produced by the method of USP 3,41 1,263 in which the margins of one web of wrapping material are folded inwardly over the edge margins of a narrower web of wrapping paper with the film sheets sandwiched in between at spaced intervals, the contacting web portions are adhered together and the webs are sealed along lines between adjacent sheets and cut to produce individually wrapped film sheets, the inherent tendency of the folded over web marginal portions to unfold and draw air into the partially wrapped package is overcome by mechanically creasing the folded web edge to set the web in its folded condition and overcome the natural resiliency of the web.
  • each web fold edge is creased along two closely spaced parallel lines spaced apart approximately the thickness of the wrapped film sheet so as to impart to the folded edge a generally square cornered configuration.
  • the present invention relates to a method and apparatus for continuously wrapping flexible sheets and is particularly useful for wrapping radiographic film sheets.
  • the described method of wrapping permits to produce an edge to edge wrapping, that is a wrapping which has two opposed edges lying close to the corresponding edges of the enclosed sheet of radiographic film.
  • each wrapping contains only one radiographic film sheet and the film is exposed through the wrapping, the advantage is obtained that :at least one edge of the film sheet may be located close to an edge of an object to be radiographed, and that several film sheets may be positioned close to each other to produce a radiographic image which .is practically uninterrupted.
  • the upper wrappings tend to buckle because of insufficiently biased by the weight of other wrappings, and some skill and time are required from the operator in order to flatten the wrappings before the box can be closed again.
  • the present invention aims to provide a method and apparatus which permit to avoid the buckling of wrappings produced according to the method described hereinbefore.
  • the basic method of wrapping flexible sheets wherein the sheets are-fed successively onto spaced portions of a first travelling web, a second web is'conducted over the path of said sheets so as to accompany them during their travel with the said first web, opposed marginal portions of the first web are folded towards each other progressively along the length of such web over the successive sheets to obtain a wrapping of a predetermined width, said folded margins of the first web and opposed margins of said second web are secured together progressively along the length of the webs, and the first andsecond web are transversely secured together between the successive sheetsand are also severed transversely to separate the successive wrapped sheets, is improved thereby in that, after the margins of both webs have been secured together, a substantially constant local pressure is applied progressively along the length of the webs on the outside of the curved portions of the folded marginal portions of the first web, while the adjacent flat portions of the web margins are kept parallel to one another, so that the elasticity of the web material at the folds is overcome.
  • the present invention is primarily concerned with the wrapping of separate radiographic film sheets, it should be understood that the method and apparatus according'to the invention are also suited for the wrappings of small stacks of film and other sheets. These sheets may be different as to thickness and flexibility, and an example of the wrapping of such different sheets is given in the description of an embodiment of the invention.
  • the apparatus for wrapping sheets comprises means for continuously advancing a first web, means for continuously advancing a second web over said first web so that sheets which are placed in succession on said first web are engaged between the two webs, folding members for folding opposed marginal portions of said first web over said second web, means for adhering the folded margins of the second web to the margins of the first web, means which determine a narrow passage for at least the marginal portions of the wrapping formed by the two adhered webs and the enclosed sheets, the height of said passage just exceeding the thickness of the wrapping, and pressure members which are located at the lateral sides of the path followed by the wrapping and which are arranged for exerting a substantially constant pressure over a short length on the flexed portions of the folded margins of thefirst web as the wrapping is being conveyed through said narrow passage and withheld thereby from buckling as the lateral pressure is exerted.
  • Preferred embodiments of the apparatus of the invention are as follows.
  • the arms are interconnected by a tension spring which is attached to the arms at a point close to the axis of rotation of the arms.
  • This spring mounting shows the advantage that the spring undergoes but very small variations in length as the arms move, so that an almost uniform tensioning is obtained.
  • the pressure members are in the form of small rollers so that a rolling friction with the folds of the wrapping material is obtained.
  • the means determining the narrow passage are formed by two closely spaced plates which are provided at either lateral side with a slot through which the said pressure members protrude.
  • FIG. 1 is a diagrammatic perspective view of an apparatus according to the invention
  • FIG. 2 is a detailed view of the pressure means for reducing the elasticity of the folds
  • FIG. 3 is a transverse cross section ofa film wrapping on line 3-3 of FIG. 2,
  • FIG. 5 is a view of a modified pressure member.
  • FIG. 6 is a view of a rotatable pressure member and FIG. 7 is a view of a particular position of rollers which stretch the wrapping.
  • the apparatus illustrated in FIG. 1 comprises the following rotatable members for the webs.
  • a hub 10 which supports a roll of a first web 11 of wrapping material, freely rotatable rollers 12, 13 and 14 over which said web is drawn, a hub 15 which supports a roll of a second web 16 of wrapping material, freely rotatable rollers l7, l8, l9 and 20 over which said second web is drawn, pairs of pull rollers which pull the webs through the apparatus and which apply extra pressure to the adhered margins, and co-operating cutting rollers 26 and 27.
  • the apparatus comprises further a tray at each lateral side of the web, such as the tray 22 shows at the right side of the web according to FIG. 1, which trays contain a liquid adhesive which may be applied through a narrow applicator roller such as the roller 24, on the margins at the underside ofthe web 16, a tray 28 which contains liquid adhesive which may be applied through applicator roller 29 at the web 11 and over the full width thereof, the folding members 30 and 31 which fold the lateral margins of the first web over the margins of the second web and a device 32 for removing the tension from the folds of the first web.
  • the apparatus comprises a feed mechanism which is arranged for depositing a sheet of radiographic film 33 together with a cardboard sheet 34 onto the moving web 11.
  • the feed mechanism is synchronized with the roller 13 which is vertically displaceable so that the web is briefly put in contact with the adhesive applicator roller 29 to apply to the web a transverse strip of adhesive which is situated between successive sheets applied to te web.
  • the rotatable cutters 26 and 27 are synchronized to sever in timed relation the wrappings on a line which is situated in the middle of the areas where the webs have been transversely adhered to each other.
  • the apparatus comprises rolls 55 and 56 from which tear strips 57 and 58 are drawn and fed between the webs to lie at the inner side of the formed folds.
  • the device 32 for removing the tension from the folds of the first web is shown more in detail in.FlG. 2. It comprises a fixed support 40 which extends transversely under the web path and which is provided at its ends with upstanding pins 41 and 42 around which arms 43 and 44 may pivot in a plane parallel to that of the webs.
  • the free ends of the arms are provided with upstanding pressure members 45 and 46, the facing sides of which are rounded off through angular degrees.
  • the pressure members extend through curved slots in two plates 47 and 48 which extend transversely of the web path and which are fixedly spaced in parallelism ovr a distance which slightly exceeds the thickness of a wrapping.
  • the arms 43 and 44 are interconnected by a helicoidal tension spring 49 to urge their free extremities towards each other.
  • the attachment of the tension spring to a point of the arms which is close to their pivot axes has the advantage that the pressure exerted by the pressure elements 45 and 46 is substantially constant, even if the width of a wrapping slightly varies
  • the core 10 contains a roll of wrapping material with a width of 230 mm.
  • the material is formed by a black pigmented polyethylene layer to which at one side an orange coloured paper layer and at the other side a black pigmented paper layer have been laminated.
  • the total thickness of the laminate amounts to 0.1 mm.
  • the core 15 contains a roll of wrapping material 16 which is of identical composition as the web 11, but which has a width of 200 mm.
  • the film sheets to be wrapped are radiographic films provided with a light-sensitive emulsion at both sides, and which measure 200 by 253 mm.
  • the web 11 carrying the film and cardboard sheets is passed under the roller 20 where web 16 is made to meet the web 11.
  • the margins of the web 11 are engaged by the folding members 30 and 31, and they re turned smoothly and progressively through 180 over a width of about 12 mm until they are applied on top of the corresponding margins of the web 16.
  • Said margins of the web 16 have been provided with an uninterrupted adhesive layer by the applicator rollers 23 and 24 so that a longitudinal bond is formed between the two webs.
  • the webs are also transversely secured to each other over a width of abou 2 cm between the successive film sheets by transverse strips of adhesive intermittently applied by the roller 29.
  • the wrapping passes between the pressure members 45 and 46 which apply a firm pressure in lateral direction to the edges of the wrapping.
  • the sides of the members facing each other are rounded off to a radius of 1.5 mm.
  • the folded margins of web 11 strongly tend to recover into substantial fiat condition but they are prevented from doing so by the plates '47 and 48.
  • Tl-le pressure applied by the members 45 and 46 and the counter pressure exerted by the plates 47 and 48 causes the folds to sharply bend through 90 at the upper and the lower corners 50 and 51 as shown in FIG. 4, so'that the wrapping material 11 is overtensioned at this loci and its elasticity is sufficiently reduced to prevent any further buckling of the wrapping.
  • the webs further pass through the pairs of rollers 25 which apply extra pressure to the adhering margins and which also determine the speed of the webs through the apparatus. Finally, the webs pass between the cutting rollers 26.and 27 which sever the successive wrappings, and which apply extra pressure on the transverse wrapping margins.
  • the movable pressure members 45 and 46 may be mounted close to or into the folding members 30 and 31. It should be understood, however, that the pressure members have a function which is different from that of the folding members and hence this differing function cannot be performed by the folding members themselves e.g. by the appropriately rectangularly shaped ends thereof.
  • the folding members are mounted in fixed relation to each other in order to produce wrappings the width of which remains constant. If the folding members were mounted in a displaceable way and spring-biased towards each other, the width of the wrapping would vary continuously as a consequence of insufficient stiffness of the 'filmand cardboard sheet, the rigidity of the wrapping web, etc.
  • first the folds be made at a substantially constant width of the wrapping, that the margins of the first sheet be secured to the margins of the second sheet, and that thereupon a pressure be applied to remove the elasticity of the material at the folds.
  • FIG. 6 A still further embodiment of the pressure members is shown in FIG. 6. It may be seen that the rigid pressure members 46 have been replaced by a rotatable pressure member such as the small roller 60 which is rotatably fitted to the extremity of the pivotable lever 44.
  • the roller has a cylindrical peripheral portion 61 with two bevelled edge portions 62 and 63.
  • the width of the cylindrical portion 61 is smaller than the thickness of the wrapping 64, shown schematically in crosssection, so that the central portion of the fold of the wrapping receives a greater pressure than the edges thereof. Thereby a somewhat hollow or concave form of the fold is obtained whereby the elasticity of the wrapping material may more efficiently be overcome, similarly to the effect of the embodiment illustrated in FIG. 5.
  • An arrangement with a rotatable pressure member as described may be desirable in case the wrapping material has rather abrasive properties.
  • Experience has shown that such kind of wrapping material is not at all an exceptional one, and that it may considerably reduce the lifetime of a stationary pressure member, even if the latter is made of hardened steel.
  • the rotatable pressure roller 60 may be located between the two plates 47 and 48 shown in FIGS. 1 and 2, but it is also possible to omit these plates and to provide near the edges of the wrapping a pair of rollers such as the rollers 65 and 66 shown in FIG. 6 which are freely rotatable around fixed axis located in a horizontal plane, and which have a bevelled edge at their outer side. In the mentioned way, the sliding contact of the wrapping with the plates 47 and 48 is replaced by a rolling contact with the rollers 65 and 66.
  • the axis of the pair of rollers 65 and 66 do not coincide with the axis of the corresponding pair of rollers at the opposite edge of the wrapping but, on the contrary, the axis of the rollers at the upper and at the lower side of the wrapping intersect each other at an angle as shown in FIG. 7 for the upper rollers 65 and 67.
  • the two pairs of rollers tend to make the margins of the wrapping follow mutually diverging paths as the wrapping advances in the direction as indicated by the arrow. Thereby a stretching effect is obtained for the wrapping, whereby the buckling of the wrapping may be overcome or considerably reduced.
  • the securing of the webs of wrapping material to each other may also be done in another way, e.g. by heat-sealing, by using pressure-sensitive adhesives, etc.
  • Apparatus for wrapping sheets comprising means for continuously advancing a first web, means for feeding the sheets to be wrapped in successive spaced relation on said first web, means for continuously applying a second web onto said first web and the sheets thereon, folding members for folding opposed marginal portions of said first web inwardly over the inward contiguous web portions to form mutually facing generally U-shaped flat pockets containing the side margins of said sheets, adhering the folded margins of said first web to the contacting margins of said second web, means defining at least one narrow slot for the passage of the respective flat pockets therethrough to maintain the folded over margins in flat condition during such passage, means operative while the respective pockets are passing through said slot to apply to the folded edge at the outer extremity of each pocket a lateral pressure sufficient to mechanically crease the folded edge in its folded condition, and means for sealing the webs together at spaced points between successive sheets and for severing the thus wrapped sheets from the moving webs.
  • said pressure applying means are each formed by an arm which is pivotable in the plane of the webs, and carries at its free end an upstanding surface bearing against the folded pocket edge.
  • said pressure applying means is in the form of a rotatable roller having its peripheral surface in rolling contact with the folded pocket edge, said peripheral surface having a thickness less than the thickness of the wrapped sheet, said roller being biased bodily in a direction laterally toward the webs.
  • slot defining means comprise at least an opposed pair of rollers for each side of the assembled webs, said rollers being rotatable around fixed axes and forming a nip through which pass at least those portions of the webs adjacent the folded pocket edge.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Basic Packing Technique (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
  • Packaging Of Special Articles (AREA)
US00174807A 1970-08-26 1971-08-25 Method and apparatus for continuously wrapping flexible sheets Expired - Lifetime US3782067A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4112670 1970-08-26

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US3782067A true US3782067A (en) 1974-01-01

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US00174807A Expired - Lifetime US3782067A (en) 1970-08-26 1971-08-25 Method and apparatus for continuously wrapping flexible sheets

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US (1) US3782067A (enrdf_load_stackoverflow)
BE (1) BE770584A (enrdf_load_stackoverflow)
DE (1) DE2139205C2 (enrdf_load_stackoverflow)
FR (1) FR2101869A5 (enrdf_load_stackoverflow)
GB (1) GB1355655A (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4621483A (en) * 1981-08-05 1986-11-11 Enviro-Spray Systems, Inc. Inflatable pouch and method of manufacture
US4974824A (en) * 1986-11-06 1990-12-04 Am International Incorporated Method of distributing a newspaper with inserts
US5155973A (en) * 1991-05-14 1992-10-20 Webcraft Technologies, Inc. Composite wrap and method for wrapping multi-page items
US20030079444A1 (en) * 2001-10-31 2003-05-01 Robotic Vision Systems, Inc. Method and apparatus for flattening cover tape
US20080110794A1 (en) * 2006-11-15 2008-05-15 Kpc-Master's Craft International, Inc. Retention packaging manufacture
CN110451016A (zh) * 2019-09-04 2019-11-15 长沙长泰智能装备有限公司 高速彩票包膜机等间距续料装置

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2939791C2 (de) * 1979-10-01 1983-01-05 Beck & Co Packautomaten, 7440 Nürtingen Verfahren und Vorrichtung zur Herstellung eines Verpackungsbeutels
US5887722A (en) * 1997-06-18 1999-03-30 American Creative Packaging Bandoleer packaging with edge heat sealed to backing
DE102009060497A1 (de) * 2009-12-23 2011-06-30 Dürr Dental AG, 74321 Vorrichtung zum Einschließen eines flachen Objektes, insbesondere einer Speicherfolie, in eine Schutzhülle
US9162403B2 (en) 2013-03-15 2015-10-20 Davis-Standard, Llc Apparatus for manufacturing and processing pre-stretch films having strips of increased thickness
DE102017202759B3 (de) * 2017-02-21 2018-05-17 Heinrich Kuper Gmbh & Co. Kg Folieneinschlagmaschine
CN110271705B (zh) * 2019-07-20 2024-06-28 浙江武义博德机械有限公司 一种锁体套膜机械及其使用方法
CN112158425B (zh) * 2020-09-22 2021-11-12 湖北辰朗科技有限公司 一种光纤海绵线盘包裹及包装生产线
CN115384845B (zh) * 2021-05-24 2025-07-01 深圳市易天自动化设备股份有限公司 一种全自动环绕屏贴合机及其贴合工艺
CN115072062B (zh) * 2022-06-01 2023-10-24 桐城市新杰包装有限公司 一种包装袋连续胶粘封边装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1394503A (en) * 1919-01-08 1921-10-18 Raymond R Taylor Dental x-ray-film packet
US2384492A (en) * 1943-09-06 1945-09-11 Schutter Candy Company Method and apparatus for packaging
US2384494A (en) * 1943-09-06 1945-09-11 Schutter Candy Company Method of packaging
US2420983A (en) * 1945-05-12 1947-05-20 Ivers Lee Co Method of and machine for packaging
US3411263A (en) * 1965-03-31 1968-11-19 Agfa Gevaert Nv Method and apparatus for packaging sheets

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3020687A (en) * 1958-09-15 1962-02-13 Falls Paper & Power Company Method and apparatus for forming individual wrapped pads from otherwise continuous batt strips
GB1141805A (en) * 1965-03-31 1969-02-05 Agfa Gevaert Nv A method and apparatus for packaging sheets
CH439065A (de) * 1966-09-14 1967-06-30 Sig Schweiz Industrieges Gefüllter Flachbeutel, Verfahren zu dessen Herstellung und Vorrichtung zur Durchführung des Verfahrens

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1394503A (en) * 1919-01-08 1921-10-18 Raymond R Taylor Dental x-ray-film packet
US2384492A (en) * 1943-09-06 1945-09-11 Schutter Candy Company Method and apparatus for packaging
US2384494A (en) * 1943-09-06 1945-09-11 Schutter Candy Company Method of packaging
US2420983A (en) * 1945-05-12 1947-05-20 Ivers Lee Co Method of and machine for packaging
US3411263A (en) * 1965-03-31 1968-11-19 Agfa Gevaert Nv Method and apparatus for packaging sheets

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4621483A (en) * 1981-08-05 1986-11-11 Enviro-Spray Systems, Inc. Inflatable pouch and method of manufacture
US4974824A (en) * 1986-11-06 1990-12-04 Am International Incorporated Method of distributing a newspaper with inserts
US5155973A (en) * 1991-05-14 1992-10-20 Webcraft Technologies, Inc. Composite wrap and method for wrapping multi-page items
US20030079444A1 (en) * 2001-10-31 2003-05-01 Robotic Vision Systems, Inc. Method and apparatus for flattening cover tape
US20030101692A1 (en) * 2001-10-31 2003-06-05 Robotic Vision Systems, Inc. Method and apparatus for flattening cover tape
US20080110794A1 (en) * 2006-11-15 2008-05-15 Kpc-Master's Craft International, Inc. Retention packaging manufacture
CN110451016A (zh) * 2019-09-04 2019-11-15 长沙长泰智能装备有限公司 高速彩票包膜机等间距续料装置

Also Published As

Publication number Publication date
FR2101869A5 (enrdf_load_stackoverflow) 1972-03-31
DE2139205C2 (de) 1983-01-27
DE2139205A1 (de) 1972-03-02
GB1355655A (en) 1974-06-05
BE770584A (nl) 1972-01-28

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