EP0824250A1 - Etikett zum Übertragen bestehend aus einer Trägerschicht und einer Transferschicht, Behälter mit einem solchen Etikett un Verfahren zum Trennen der Transferschicht vom Behälter - Google Patents

Etikett zum Übertragen bestehend aus einer Trägerschicht und einer Transferschicht, Behälter mit einem solchen Etikett un Verfahren zum Trennen der Transferschicht vom Behälter Download PDF

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Publication number
EP0824250A1
EP0824250A1 EP96202263A EP96202263A EP0824250A1 EP 0824250 A1 EP0824250 A1 EP 0824250A1 EP 96202263 A EP96202263 A EP 96202263A EP 96202263 A EP96202263 A EP 96202263A EP 0824250 A1 EP0824250 A1 EP 0824250A1
Authority
EP
European Patent Office
Prior art keywords
layer
transfer
container
label
soaking
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.)
Withdrawn
Application number
EP96202263A
Other languages
English (en)
French (fr)
Inventor
Thomas Lynn Brandt
Daniel Nathaniel Willkens
Patrick Johannes Blom
Erwin Anton Rosens
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.)
Heineken Technical Services BV
Brandt Technologies Inc
Original Assignee
Heineken Technical Services BV
Brandt Technologies Inc
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
Application filed by Heineken Technical Services BV, Brandt Technologies Inc filed Critical Heineken Technical Services BV
Priority to EP96202263A priority Critical patent/EP0824250A1/de
Priority to SI9730297T priority patent/SI0888601T1/xx
Priority to CN97194803A priority patent/CN1121670C/zh
Priority to DE69709073T priority patent/DE69709073T2/de
Priority to CA 2250142 priority patent/CA2250142A1/en
Priority to NZ331864A priority patent/NZ331864A/xx
Priority to DK97907476T priority patent/DK0888601T3/da
Priority to PT97907476T priority patent/PT888601E/pt
Priority to PCT/NL1997/000138 priority patent/WO1997035291A1/en
Priority to SK1282-98A priority patent/SK128298A3/sk
Priority to AT97907476T priority patent/ATE210876T1/de
Priority to EP97907476A priority patent/EP0888601B1/de
Priority to US09/155,032 priority patent/US6379761B1/en
Priority to BR9708132-9A priority patent/BR9708132A/pt
Priority to JP53337397A priority patent/JP2000507364A/ja
Priority to AU19467/97A priority patent/AU1946797A/en
Priority to ES97907476T priority patent/ES2167715T3/es
Priority to PL97329030A priority patent/PL186479B1/pl
Publication of EP0824250A1 publication Critical patent/EP0824250A1/de
Priority to HK99102889A priority patent/HK1017754A1/xx
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/08—Cleaning containers, e.g. tanks
    • B08B9/083—Removing scrap from containers, e.g. removing labels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/08—Cleaning containers, e.g. tanks
    • B08B9/0861—Cleaning crates, boxes or the like
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/08—Fastening or securing by means not forming part of the material of the label itself
    • G09F3/10—Fastening or securing by means not forming part of the material of the label itself by an adhesive layer

Definitions

  • the invention relates to a transfer label comprising a backing layer and a transfer layer releasably attached thereto, which transfer layer can be detached from the backing layer for transfer to a container.
  • the invention also relates to a container, in particular to a plastic crate, comprising such a transfer layer and to a method of removing such a transfer layer from a container.
  • a second way of labelling containers encompasses gluing printed paper labels to containers such as plastic crates or bottles at the time of filling and sealing.
  • This type of labels however offer little resistance to label damage from handling and exposure to moisture (wrinkling).
  • paper labels are difficult to remove from crates, and tend to clog the crate washers available today. Upon removal of paper labels from plastic crates, a glue residue may be left on the crates.
  • a third technique for labelling containers, in particular glass bottles is based on the principles as described in WO 90/05088.
  • a method of labelling bottles is described which provides a durable, highly impact resistant label and yet permits high definition label printing.
  • a transfer label comprising a removable backing layer is provided which backing layer is reverse printed with a vinyl or acrylic ink which is cured and overprinted with adhesive.
  • the label is applied to the container with its adhesive surface in contact therewith.
  • the backing layer is separated from the transfer layer of the label for instance by the application of heat to either the container, the label or to both.
  • the labelled container is then applied with a coating which is subsequently cured.
  • the cured coating provides the required degree of impact resistance and durability.
  • the disadvantage of permanently attached labels is that when these labels get scratched or otherwise damaged, they cannot be easily removed from the bottles. Also, it is not possible to provide the same containers each time with new and/or different labels, which is desirable for promotional activities.
  • the labels should be applied and removed at relatively high speeds.
  • the transfer label according to the present invention which is characterized in that the transfer layer, after attachment to a container and under turbulent soaking conditions in an aqueous liquid of a temperature not more than 100°C, preferably not more than 70 °C, breaks up in at least 4 parts, each part not smaller than 5 micrometers and is detached from the container within a soaking time of not more than 10 minutes, preferably not more than 20 seconds.
  • the breaking up of the transfer layer during removal by soaking provides for an increase in the number of positions of the label where the soaking solution can penetrate and attack the interface of the container and the label and can hence detach the label from the container.
  • a very rapid removal of the label from the container is achieved at modest temperatures.
  • the label disintegrates into smaller fragments, these fragments can be removed from the soaking solution by a simple sieving process without the labels dissolving in the soaking solution.
  • no contamination of the wash solution occurs, and effluents to the surroundings of ink and other label parts can be prevented.
  • the transfer labels which break up into pieces in the soaking solution according to the present invention can be very rapidly removed using conventional crate washing apparatus, which normally is used to remove dirt and/or paper labels from re-usable plastic crates for containing bottles.
  • a transfer label according to the present invention can for instance be removed from a plastic crate within ten (10) seconds, compared to a removal time of several minutes or more for conventional paper labels.
  • Still the adherence of the transfer label according to the invention to a container, preferably to a reusable plastic crate for bottles during in-use conditions and its scratch resistance are very good compared to conventional paper labels.
  • the label can also be used in combination with plastic bottles, such as PET-bottles, plastic food trays, glass bottles and the like
  • a preferred transfer label according to the present invention comprises a transfer layer which is permeable for the soaking liquids.
  • a transfer layer has a water uptake value after 3 hours between 0.0 and 100 g/m 2 , preferably about 5 g/m 2 , in water at room temperature.
  • Such labels have a water vapour transmission rate between 50 and 750 g/m 2 , preferably about 600 g/m 2 after 24 hours for water at room temperature.
  • the transfer layer may comprise a cover layer overlaying the ink pattern, which cover layer forms the outwardly facing surface upon attachment of the transfer layer to a container.
  • the cover layer may for instance be formed by an acrylic wax coating.
  • the cover layer may be a continuous layer, or may be discontinuous and printed in register with the ink pattern.
  • the acrylic wax cover layer can very advantageously be penetrated by for instance a 0.5% NaOH-solution, while providing a sufficient barrier to penetration of moisture during storage and use-conditions of the label on a container.
  • Labels according to the present invention which combine sufficient durability with quick and economic removal have a pencil hardness between 1N and 7N in the dry state and a pencil hardness less than 0.5 N after a soaking time between 1 minute and 15 minutes in water at 20°C.
  • the ink pattern is discontinuous such that areas of reduced thickness are formed in the transfer layer.
  • these areas of reduced thickness for instance, between separate zones of the ink pattern, can form natural lines of weakening such that break-up of the label in these areas can more easily occur.
  • the transfer layer preferably comprises an adhesive layer, the tack of which is at least reduced by contact with the soaking liquid.
  • the adhesive is dissolved by the soaking liquid.
  • this adhesive layer is discontinuous and is printed in register with the ink pattern.
  • a suitable transfer label has a transfer layer with a thickness of not more than 30 micrometers, preferably not more than 20 micrometers.
  • the adhesive layer lay down weight is not higher than 10 g/m 2 , preferably around 3-6 g/m 2 . These weights provide good adhering of the label during use and allow for break-up of the label in parts during the wash process.
  • the labels according to the invention are applied to returnable crates.
  • the need for returnable crates is a direct result of industry preference and government legislation with regard to returnable (refillable) containers in various parts in the world instead of one way packaging.
  • returnable (refillable) containers in various parts in the world instead of one way packaging.
  • This type of recycling environment a whole new market has been created for the handling of packaged beverage containers. This is presently true for both refillable PET and glass bottle containers.
  • a single, blank crate can be used which can in an easy and inexpensive way be provided with an image imprint which can also easily be removed after the crate is returned to the bottle line for refilling.
  • Containers being provided with a transfer layer according to the present invention can be "cleaned" very rapidly in a conventional crate washing station with cleaning times per container below 1 minute, preferably below 10 seconds at temperatures below 100 °C, preferably below 70°C.
  • the soaking solution is pumped through a sieve which collects the pieces of the broken up labels.
  • the sieves are periodically cleaned and the label pieces are removed from the sieves of the washing station.
  • a transparent protective cover layer is attached over the transfer layer upon or after attaching the transfer layer to the container.
  • This cover layer or coating improves the resistance of the label against environmental influences without impairing its break-up properties during wash conditions.
  • a preferred material for the protective coating is compatible with the material of the ink used in the transfer layer. More preferably all materials, adhesive, ink and protective coating are based on acrylate polymers.
  • one or more heat treatments may be given after application of the label to cause a shrinking of at least parts of the transfer layer, to provide a coalescence of the materials of the various layers. This results in an improved service life without deteriorating the wash-off behaviour of the transfer layer.
  • a label according to the present invention that combines sufficient durability during storage and use with quick and economic removal has preferably been heat treated after application to the container at a temperature between 40°C and 100°C, preferably between 50°C and 90°C.
  • the selection of the adhesive to be used in adhering the label image to the container surface will influence the wash-off properties.
  • the adhesive must have been activated prior to or during application of the transfer layer to the container.
  • An easy and generally preferred method of applying the image is through the use of heat activatable adhesives that have been applied to the image in the form of a reverse printed label.
  • Other methods include the use of adhesive that can be activated through radiation, chemicals, electron-beam, micro-wave, UV and the like. It is also possible to use adhesives that can be activated through photo initiation, humidity, enzymatic action, pressure or ultra-sonic treatment.
  • a preferred adhesive has a low tack temperature, preferably between 60°C and 90°C, more preferably between 80°C and 90°C.
  • a separate layer of adhesive it is also possible to use in the transfer layer an ink which in itself has adhesive properties upon activation.
  • Figure 1 shows the transfer label positioned for application.
  • the label is printed on a backing layer, formed by a film substrate 1 which may be any thin film, but in the case described is polypropylene of 2 mils thickness.
  • 3 is an acrylic coating which may or may not be employed, depending on the type and source of the film available.
  • 2 is a release material which coats the film 1. In the case of the invention it is silicone which is applied at the time of film manufacture.
  • All the printed ink material is represented by reference numeral 4. Depending on the label graphics and opacity requirements the ink materials may be as many as five 5 different colours in one or more layers, some of which may overlay another. 5 and 6 represent two (2) layers of adhesive to indicate the build up of adhesive from 0.5 to 1.5 pounds per ream, depending on the labelled surface uniformity and rigidity of the container being labelled.
  • the transfer layer is hence formed by layers 3, 4, 5 and 6.
  • the printed ink materials are urethane, vinyl or acrylic resin based, coloured with temperature and ultra violet stable pigments. In the case of white ink, titanium dioxide is the pigment of choice. Pigment particle size ranges from three (3) to five (5) ⁇ .
  • the printed adhesive is a water borne organic material with an initial tack temperature of 185°F (85°C). This initial tack temperature is very important to the plastic labelling process because it determines the required plastic surface temperature at the time of transfer. In case the particular plastic container being labelled is a returnable crate for bottles there is no support of the inside surface. Hence it is desired to maintain the plastic of the crate below 200°F (93°C) to avoid distortion of the surface by reaching its point of deformation during the label transfer.
  • FIG. 2 shows a schematic side view of a crate washing apparatus for removing the transfer layers according to the present invention from crates 12 that are supplied to the crate washer 10 via a transport conveyor 11.
  • Crates 12 are first transported to pre-rinsing station 13 and sprayed with a pre-rinsing solution which is applied from a number of nozzles 14 located above and below the transport conveyor 11.
  • the speed of the conveyor 11 is such that the dwell time of the crate 12 in the pre-rinsing station is between 6 and 8 seconds.
  • the temperature of the pre-rinse solution is 60°C.
  • the pre-rinse solution preferably comprises a 0.5% NaOH solution.
  • the crates After passing through the pre-rinsing station 13, the crates are transported through a soaking station 15 via a downwardly sloping section 16 of the conveyor 11.
  • the dwell time of crate in the soaking station is between 10 and 40 seconds.
  • the crate In the soaking station, the crate is completely submerged and a soaking solution is recirculated in the soaking station 15 by means of nozzles 35 to cause turbulent soaking conditions.
  • the turbulent soaking conditions may for instance include recirculating the liquid from the soaking station 15 via the nozzles 35 at a rate of 60 m 3 /h for a total volume of the soaking solution of 5 m 3 . It is important that the transfer layers are completely removed from the crates 12 in the soaking station 15, without any pieces remaining on the crates. Such remaining pieces would, when dried, adhere firmly to the crates and form an undesired contamination of the crate surface.
  • the crates are transported via the upwardly sloping conveyor track 17 to an after-rinse station 18.
  • the after-rinse solution may comprise water at a temperature of 30°C.
  • the dwell time of the crates in the after-rinse station 18 is between 6 and 13 seconds.
  • each sieving section comprises a rotating belt sieve 23, 24, 25, which are driven by motors 26, 27, 28 respectively.
  • Pumps 29, 30 and 31 draw the rinsing liquid and the soaking liquid from each perspective station through the rotating sieve belts 23, 24, 25 a rate of for instance 60 m 3 /h.
  • the sieved liquids are recirculated back to nozzles 14 and 19 in the pre-rinse and after-rinse stations 13, 18 respectively and to the soaking station 15.
  • Figure 3 shows a cross-sectional view along the lines III-III of figure 2. It can be seen that the sieve belt 24 is rotated around two rollers 37, 38. The top end of the sieve belt 24 extends above the level of the soaking liquid in the soaking station 15.
  • the sieve belt 24 comprises a dual layer belt-like sieving element with a mesh size of 2 millimetres. During operation it is important to continuously rotate the sieve belt 24 to prevent the label pieces from the transfer layers that break up into pieces in the soaking station 15, from clogging the sieve belt.
  • a spraying nozzle 39 cleans the surface of the belt-like sieving elements by high pressure water or air jets. The removed label elements are collected in a collection compartment 40.
  • Figure 4 shows a transfer label according to the present invention comprising a carrier, or backing layer 48 formed by for instance a two-mil thick polypropylene film.
  • a silicone release layer 49 is located on the carrier layer 48.
  • a transfer layer 50 is placed which consists of a top containment layer 51, a continuous ink layer 52, a bottom containment layer 53 and an adhesive layer 54.
  • the carrier layer 48 and the silicone layer 49 are removed under application of heat and pressure.
  • the adhesive layer 54 bonds the transfer layer 50 to an underlying container surface, and the outwardly facing layer is formed by the top containment layer 51.
  • the label carrier 48 which is provided with the electron beam-cured silicon layer 49 can be for instance a polypropylene film of 1-3 mil thickness as supplied by Mobil Chemical, Films Division, Rochester, New York.
  • the silicone surface Prior to printing of the top containment layer 51, onto the silicone layer 49, the silicone surface must be corona treated. A corona treatment will allow uniform wetting of the print materials and still allow for release of the transfer layer 50.
  • the corona treatment is applied to the carrier layer 48 and silicone layer 49 shortly before the first print of the top containment layer 51 is applied.
  • a target treatment level should be approximately 30% of 3.5 kW.
  • the top containment layer 51 consists for instance of unpigmented ink, and has several functions. Firstly it slows or prevents water penetration into the underlying ink layer 52. As the layer 51 is printed wider than the underlying ink layer 52 it forms part of an envelope which totally surrounds the coloured ink layer 52. Furthermore the top containment layer 51 provides a consistent medium between the ink and the silicone release surface 49. The layer 51 is very important to the overall transferability of the label and should be applied at a weight of at least 1.4 g/m 2 . It is important that upon application of the top containment layer 51 this layer is free of airbubbles and pinholes. Furthermore the top containment layer must be dry before printing the subsequent ink layer 52 thereon.
  • top containment layer 51 After printing the top containment layer 51 onto the release layer 49, an optimum peel force of 100 g or less should be measured on the press in a standard tape peel test. Within five hours after application, the peel force of the top containment layer will be about 60% less, or 40 g. With the specified peel force, the containment layer 51 should be removed completely.
  • a suitable material for the top containment layer 51 is available from Environmental Inks and Coatings, Morganton, North Carolina under type number 1304.
  • Examples of a preferred ink for the ink layer 52 include a waterborne organic as available from Environmental Inks and Coatings, Morganton, North Carolina under type number Aqua BW EH-31721, EH 53016, EH 90967. These inks have a high stability even at temperatures over 200°C without discoloration or loss of adhesion.
  • the bottom containment layer 53 provides a strong interface between the adhesive layer 54 and the coloured ink layer 52. It is formulated to chemically anchor to the ink and provide excellent wetting and bounding of the adhesive layer.
  • the bottom containment layer 53 attaches outside the ink layer 52 to the top containment layer 51 such that a closed envelop is formed around the ink layer 52.
  • a suitable material for the bottom containment layer 53 is available from Environmental Inks and Coatings under type number 1189.
  • the adhesive layer 54 can be formed by a waterborne organic material which is printed in a number of consecutive flexographic stations such as three stations, or can be floodcoated on a single station.
  • the adhesive layer 54 may also be applied by a single gravure printing station.
  • the adhesive 54 is heat-activated and has a low tack temperature from 80°C up to 107°C.
  • the preferred weight of adhesive is approximately, 3.5 g/m 2 .
  • a suitable adhesive is available from Environmental Inks and Coatings under type no. XP 11358.
  • the layers of the transfer layer 50 may be applied in a flexographic printing press with up to 10 printing stations. Five stations may be used for printing the layers 51,53 and the adhesive layer 54 which can be composed of three separate adhesive layers. Five types of coloured ink 52 may be applied using the five remaining flexographic printing stations.
  • a gravure press equiped with a corona treater may be used instead of a flexographic printing process. Because material laydown is heavier than in the flexographic process, only three gravure printing stations may be necessary for applying the containment layers 51 and 53 and the adhesive layer 54.
  • the ink layer 52,52' and the layer of adhesive 54,54' are discontinuous.
  • the adhesive layer 54,54' is printed on the ink pattern 52, 52' such that it has a small overlap with the printed areas.
  • the adhesive layer 54,54' in this embodiment attaches to the continuous top containment layer 51. In this way, to break up the transfer layer 50, only the top containment layer 51 needs to be ruptured, so that the soaking solution can quickly penetrate towards the adhesive layer 54 and the transfer layer 50 easily becomes detached.
  • the adhesive layer 54 is a continuous layer.
  • the top containment layer 51,51' has been printed in register with the ink pattern 52, 52' such that it has a slight overlap with the ink areas.
  • the ink pattern 52,52' is encased between the containment layer 51,51' and the adhesive layer 54.
  • the ink pattern 52, 52' can be formed by individual letters, individual words or individual patterns such as dots, squares, etc.
  • the minimum dimension of the individual ink patterns may be as small as for instance 0.5 mm.
  • a self-adhesive ink 52, 52' has been used which directly bonds to a container surface.
  • the ink is overlain by a continuous top containment layer 51.
  • both the containment layer 51, 51' and the adhesive layer 54,54' are discontinuous and are printed in register with a discontinuous ink pattern 52, 52' Again the ink is encased in envelopes between the layers 51 and 54.
  • Access to the adhesive layers 54,54' by the soaking solution is very good through the open areas between the pattern of the layers 51,52,54,51',52',54' and 51'', 52'' and 54''.
  • Figure 9 shows a schematic view of the application process of a transfer layer from a transfer label according to the invention to a returnable crate 59.
  • Station 60 shows the step of surface treatment and temperature stabilization by means of a pre-heating treatment using a flame heater or burner 60'.
  • a flame heater or burner 60' For adhesion of two polymeric materials to occur, many factors must be considered such as cleanliness, pressure, temperature, contact time, surface roughness, movement during bonding and adhesive film thickness. An additional important consideration is the critical surface tension.
  • the commonly accepted method of measuring the critical surface tension is with a Dyne solution, which is well known.
  • the critical surface tension of polyethylene is 31 Dynes per centimetre.
  • a series of tests were performed which demonstrated for best adhesion of the adhesive previously described to the polyethylene surface, a treatment level of 60 to 70 Dynes per centimetre was necessary. Further testing of commercially available equipment showed that flame treatment optimized both capital cost, operating cost and time required to achieve the required critical surface treatment.
  • Station 62 illustrates the method of label application whereby the printed ink materials are transferred from the polypropylene film substrate to the polyethylene surface utilizing the tactile characteristics of the heat activated adhesive to overcome the bond of the transfer layer to the corona treated silicone coating.
  • the factors that influence transfer are time to contact, temperature and pressure applied during contact and film tension during contact particularly tension of the film after ink release.
  • the diameter of pressure roll 63 is also a factor but not a variable. For this application the roll diameter is 38 mm.
  • the roller 63 is made of silicone rubber over a steel core, with rubber durometer ranging from 50 Shore A to 80 Shore A. It should be noted that distortion (flattening) of the rubber roller is less at higher durometer, consequently the contact area is less and the transfer pressure is greater.
  • Roller pressure is provided by an air cylinder 64 activated by a conventional solenoid valve which in turn is operated by two (2) proximity switches, one to advance the roller and the other to retract. Other means, such as mechanical linkage are obvious and will not be listed here.
  • the pressure is distributed across the length of the cylinder and for this particular label, transfer ranges from 12 to 17 kilograms per centimetre of roller length are desirable.
  • the invention results in the film being advanced at exactly the same rate as the crate is moving past the roller by virtue of the heat activated adhesive adhering to the high energy crate surface.
  • the pressure roller 63 which rotates freely, maintains the same tangential speed as the linear speed of the film and crate. Thus the ink is transferred completely and without distortion.
  • the pressure roller 63 is molded to a hollow core. Suspended within the hollow core is a resistance heater operated through a controller. The heating element, rated at 500 W, will maintain the roller surface at any predetermined temperature. For purposes of the invention, the roller surface temperature range between 250°F and 370°F (120°C and 190°C).
  • High temperature films such as polyester may be operated in continuous contact with the heated roller.
  • Low temperature films such as polypropylene must be prevented from contacting the heated roller during pauses in the labelling operation.
  • film guides 65 are used to support the film when the roller is retracted. The guides 65 are mounted to maintain a clearance of approximately 13 mm between the guides and the labelled surface. At the same time the roller is retracted approximately 13 mm behind the film. By maintaining those clearances, stretching and distortion of the film such as polypropylene is avoided. High temperature films would not require the guides.
  • Conventional nip rollers and stepping motor are used to advance the film to the next label and position it accurately, using a printed mark to trigger an optical scanning device.
  • the final processing step is to coalesce the layers of the coating, label ink, and adhesive at station 67 by means of flame heater 67' and also to inter diffuse the adhesive layer with the polyethylene substrate formed by the crate 59.
  • a transfer layer 50 having the configuration as shown in figure 4 was applied to a polyethylene crate.
  • the dimensions of the label were about 10 by 10 centimetre and the adhesive layer 54 was a 100% urethane adhesive with a tack temperature of 79°C.
  • the labels were applied to the crate with a temperature of roller 63 in figure 9 of 155°C at a roller pressure of 2.5 bar.
  • the pre-heat temperature of the crate (in stations 60 and 61 of figure 9), was 75°C.
  • the speed of the crates 59 through the label applicator was 40 crates per minute.
  • post-treat temperatures 40°C, 65°C and 90°C were used.
  • the crates were stored for at least 24 hours at a temperature of 20°C.
  • the crates to which a label was applied, were thereafter soaked in a 0.5% NaOH-solution at temperatures of 20°C, 50°C, and 70°C.
  • the soaking of the crates was carried out in a soaking bath of 20 litres without turbulence, for such a soaking time (10-50 seconds) that after spraying the soaked crate with a showerhead at a rate of 6 litres/minutes, the label was completely removed within 2 seconds.
  • a second set of crates was prepared wherein after label application, a coating layer of wax was applied, such as at station 66 of figure 9.
  • the purpose of the pencil scratch test is to identify the minimum and maximum durability of a label which can be obtained by taking different measures such as the use of a covering wax layer and heat treatment to cause coalescing of the label layers. Crates with labels which were applied with different post-heating temperatures, with and without wax, have been tested.
  • the labels were the same labels as used in the washing trial described above, and were applied to the crates under the same conditions.
  • the crates were stored for at least 24 hours at a temperature of 20°C. Prior to scratching, the crates were soaked in a water without turbulence at 20°C. The results of the scratch test are given in table III and table IV in which the scratch results are given in N.
  • Pencil scratch test (in N) label without wax coating Post-heat Temperature (°C) soaking time (min) 0 0.5 1 1.5 2 2.5 3 3.5 none 1 0.4 0.2 0.1 1 0.3 0.2 0.1 40 1.3 0.9 0.2 0.1 1.1 0.7 0.2 0.1 65 1 .1 0.7 0.2 0.1 1 0.5 0.1 0.1 90 1.5 1.2 0.8 0.6 0.6 0.4 0.2 0.1 1.1 1 0.8 0.6 0.5 0.3 0.2 0.1 Pencil scratch test (in N) label with wax coating Posttreat soaking time (°C) (min) 0 0.5 1 1.5 2 2.5 3 4 5 6 7 8 9 10 none 5 3 1.4 0.5 0.3 0.2 0.1 5 3 1.5 0.7 0.4 0.2 0.1 40 5 2.8 1.3 0.4 0.3 0.1 5 3 1.4 0.6 0.4 0.2 0.1 65 5 2.5 1.2 0.5 0.3 0.2 0.1 5 2.9 1.3 0.5 0.2 0.1 90 5 4 2.5 1.3 0.7 0.7 0.6 0.4 0.4 0.3
  • the strength of the labels was found to be insufficient for labels which did not have a wax coating.
  • the target pencil hardness in the dry state should be around 1.2 N and the soaking time until the scratch force drops below 0.3 Newton should be below 3 minutes.
  • the target scratch force should be about 5 Newton in the dry state and the soaking time until the scratch force drops below 0,3 N should be below 10 minutes. Transfer layers having the above properties were found to have an optimal combination of durability and washability.
  • the labels according to the present invention can be easily removed from a container, in particular from a plastic crate due to their specific water permeability which allows the soaking solution to penetrate the label, and subsequently beak up the label in pieces and detach it from the container. It was found that preferred labels have a water absorption of around 5 g/m 2 after 3 hours in a water uptake test as described below. Labels according to the invention have a water uptake value higher than 0 and less than 100 g/m 2 in 3 hours. The water release of a preferred label was 4.5 g/m 2 within 30 minutes in the water release test as described below. Preferred labels according to the present invention will have a water release value greater than 0 (a complete barrier) and less than 100 g/m 2 after 3 hours.
  • the samples were prepared as follows: the glass supports were thoroughly cleaned and placed in a heating oven until an approximate temperature of 250°F was reached on the glass surface. The glass was then removed from the heating oven and placed on a silicone rubber mat. A label was immediately set on the glass and secured to the surface by the use of a silicone roller. Rolling pressure was continually supplied to the full length of the label until all entrapped air was removed (approximately 5-6 back and forth motions). After the glass had cooled, the carrier film was removed.
  • the opposite side of the glass plates were labelled by heating a clean aluminium plate (slightly larger than the glass plate) to approximately 250°F in a convective oven, then placing the glass on the surface of the aluminium plate (label surface down) which allowed the heating of the glass upper surface.
  • the label was then applied and secured in place by the silicone roller as described above.
  • the carrier film was removed.
  • a wax coating having a dry weight of 0.043 grams was applied to the surface of both labels.
  • flame treatment was applied to both labels by quickly passing the flame across the entire surface of the label sample. Once the samples were cooled the labels were ready for the Water Uptake test.
  • a stainless steel immersion tank of a 33.66 centimetre diameter and 24.13 centimetre height was filled with the deionized water. Care was taken that the water level was deep enough to allow total immersion of the sample.
  • the sample was placed with the short dimension set perpendicular to the bottom of the tank.
  • the glass supports were placed on a thin wire frame in the immersion tank.
  • a thermocouple was installed inside the water immersion tank. After each time period, as given in table V, the sample was removed from the tank, excess surface water was blotted dry, the sample was weighted and placed back in the tank. This procedure was continued for the duration of the test. The results are shown in table V.
  • sample 1 With regard to sample 1, this sample reached it maximum absorption of 0.04 grams at the 3 hour mark and maintained this level to the 5 hour mark before giving up its ability to retain water at this level. After the 5 hour period the label lost its ability to hold water. We believe this phenomenon was caused because of label structure degradation. For sample 2, this sample also reached its maximum absorption of 0.04 grams at a 3 hour mark. At the 5 hour mark this sample was terminated from further testing in preparation for the water release test described below.
  • a preferred label of a thickness of 12.7 microns has a water uptake value of 0.04g/85.8 cm 2 or about 5g/m 2 after 3 hours at room temperature.
  • Water Uptake Test Time Sample 1 Weight in grams Sample 2 Weight in grams Relative Humidity (%) Tank Water Temperature (°F) Room Air Temperature (°F) 8:00 a.m. 59.77 59.77 47 71 72.4 8:10 a.m. 59.80 59.80 47 71 72.4 9:00 a.m. 59.81 59.81 47 71 72.4 10:00 a.m. 59.83 59.83 47 71 72.4 11:00 a.m.
  • the sample 2 as prepared above was subjected to the water release test.
  • the sample was blotted to remove access water, weighted and the data were recorded.
  • the sample was first exposed to ambient temperature for one half hour and weighed.
  • Half an hour after weighing the sample it was placed in a prewarmed (53°C) test oven (small electrically heated oven, Quieny Lab Inc., Model 20 Lab oven or equivalent).
  • the sample was left in the prewarmed oven for more than one hour and weighted. Thereafter the sample was placed back in the test oven and remained there for 3.5 hours.
  • the optimum combination of durability and washability of the labels according to the invention is at least partly due to the permeability of the label for the soaking solution.
  • a sample of the transfer layer of the same type as tested in the water uptake/release test of a thickness of 12.7 microns was tested for water vapour transmission.
  • a 25 millilitre glass container with a 15.9 millilitre orifice was cleaned with acetone and filled with approximately 10 millilitres of deionised water.
  • the orifice area of the container was heated to approximately 118°F and a circle segment of the transfer layer was firmly applied using a small piece of silicone rubber as a pressure pad. After the container/label had cooled, the backing film was gently removed.
  • the sample preparation was completed by adding a wax coating (0.001 g across the 1.99 cm 2 surface) and let air dry.
  • a second glass container of the same dimensions as described above was cleaned thoroughly with acetone and filled with 10 millilitre of deionized water. The orifice area of the sample was heated as well. This sample was used as the control sample.
  • the completed samples were then weighted various intervals over a 26.6 hour time period.
  • the water vapour transmission rate over the total time of the experiment equated to 568.75 g/m 2 in a 24 hour time period at 22.2°C at 46% relative humidity. It was found that a "steady state” water vapour transmission rate was not achieved until approximately 28 minutes from time 0. When using the "steady state” data after 28 minutes from time 0, the water vapour transmission rate was found to be about 526.93 g/m 2 in 24 hours.
  • the water vapour transmission rate of the preferred label according to the present invention will lay between 50 g/m 2 and 750 g/m 2 after 24 hours (22.2°C, 44% relative humidity), preferably around 500 g/m 2 after 24 hours.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Details Of Rigid Or Semi-Rigid Containers (AREA)
EP96202263A 1996-03-20 1996-08-12 Etikett zum Übertragen bestehend aus einer Trägerschicht und einer Transferschicht, Behälter mit einem solchen Etikett un Verfahren zum Trennen der Transferschicht vom Behälter Withdrawn EP0824250A1 (de)

Priority Applications (19)

Application Number Priority Date Filing Date Title
EP96202263A EP0824250A1 (de) 1996-08-12 1996-08-12 Etikett zum Übertragen bestehend aus einer Trägerschicht und einer Transferschicht, Behälter mit einem solchen Etikett un Verfahren zum Trennen der Transferschicht vom Behälter
SK1282-98A SK128298A3 (en) 1996-03-20 1997-03-19 Transfer label comprising a backing layer and a transfer layer, container comprising such a transfer layer and method of removing a transfer layer from a container
AT97907476T ATE210876T1 (de) 1996-03-20 1997-03-19 Etikett zum übertragen bestehend aus einer trägerschicht und einer transferschicht, behälter mit einem solchen etikett und verfahren zum trennen der transferschicht vom behälter
DE69709073T DE69709073T2 (de) 1996-03-20 1997-03-19 Etikett zum übertragen bestehend aus einer trägerschicht und einer transferschicht, behälter mit einem solchen etikett und verfahren zum trennen der transferschicht vom behälter
CA 2250142 CA2250142A1 (en) 1996-03-20 1997-03-19 Transfer label comprising a backing layer and a transfer layer, container comprising such a transfer layer and method of removing a transfer layer from a container
NZ331864A NZ331864A (en) 1996-03-20 1997-03-19 Transfer label comprising a transfer layer, container comprising the transfer layer and method of removing the transfer layer from the container
DK97907476T DK0888601T3 (da) 1996-03-20 1997-03-19 Overføringsetiket, der omfatter et bagbeklædningslag og et overføringslag, beholder, der omfatter et sådant overføringslag, og fremgangsmåde til fjernelse af et overføringslag fra en beholder
PT97907476T PT888601E (pt) 1996-03-20 1997-03-19 Etiqueta de estampar que compreende uma camada de apoio e uma camada de transposicao, recipiente que compreende uma tal camada de transposicao e processo para remover uma camada de transposicao de um recipiente
PCT/NL1997/000138 WO1997035291A1 (en) 1996-03-20 1997-03-19 Transfer label comprising a backing layer and a transfer layer, container comprising such a transfer layer and method of removing a transfer layer from a container
SI9730297T SI0888601T1 (en) 1996-03-20 1997-03-19 Transfer label comprising a backing layer and a transfer layer, container comprising such a transfer layer and method of removing a transfer layer from a container
CN97194803A CN1121670C (zh) 1996-03-20 1997-03-19 转印标签及包含这种标签的容器
EP97907476A EP0888601B1 (de) 1996-03-20 1997-03-19 Etikett zum übertragen bestehend aus einer trägerschicht und einer transferschicht, behälter mit einem solchen etikett und verfahren zum trennen der transferschicht vom behälter
US09/155,032 US6379761B1 (en) 1996-03-20 1997-03-19 Transfer label comprising a backing layer and a transfer layer, container comprising such a transfer layer and method of removing a transfer layer from a container
BR9708132-9A BR9708132A (pt) 1996-03-20 1997-03-19 Rótulo de transferência recipiente, particularmente um engradao plástico e processo para lavar um recipiente.
JP53337397A JP2000507364A (ja) 1996-03-20 1997-03-19 裏打ち層及び転写層を含む転写ラベル、かかる転写層を含む容器並びに容器から転写層を除去する方法
AU19467/97A AU1946797A (en) 1996-03-20 1997-03-19 Transfer label comprising a backing layer and a transfer layer, container co mprising such a transfer layer and method of removing transfer layer from a container
ES97907476T ES2167715T3 (es) 1996-03-20 1997-03-19 Etiqueta de transferencia que comprende una capa de soporte y una capa de transferencia, envase que comprende dicha capa de transferencia y procedimiento para retirar una capa de transferencia de un envase.
PL97329030A PL186479B1 (pl) 1996-03-20 1997-03-19 Etykieta nośna na pojemnik i sposób zmywania etykiety nośnej z pojemnika
HK99102889A HK1017754A1 (en) 1996-03-20 1999-07-07 Transfer label comprising a backing layer and a transfer layer, container comprising such a transfer layer and method of removing a transfer layer from a container

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP96202263A EP0824250A1 (de) 1996-08-12 1996-08-12 Etikett zum Übertragen bestehend aus einer Trägerschicht und einer Transferschicht, Behälter mit einem solchen Etikett un Verfahren zum Trennen der Transferschicht vom Behälter

Publications (1)

Publication Number Publication Date
EP0824250A1 true EP0824250A1 (de) 1998-02-18

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EP96202263A Withdrawn EP0824250A1 (de) 1996-03-20 1996-08-12 Etikett zum Übertragen bestehend aus einer Trägerschicht und einer Transferschicht, Behälter mit einem solchen Etikett un Verfahren zum Trennen der Transferschicht vom Behälter

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EP (1) EP0824250A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116080294A (zh) * 2022-12-12 2023-05-09 库尔兹压烫科技（合肥）有限公司 转移膜、用于制造转移膜的方法和用于回收转移膜的方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3037250A1 (de) * 1980-10-02 1982-04-29 Joachim 7440 Nürtingen Dudzik Selbstklebeetikett
WO1990005088A1 (en) 1988-11-07 1990-05-17 Brandt Manufacturing Systems, Inc. Container label and system for applying same
EP0503112A1 (de) * 1991-03-13 1992-09-16 Töpfer Kulmbach GmbH Mechanisch ablösbares Etikett für handelsfähige Gegenstände aller Art, wie Flaschen u.dgl. mehr
EP0510403A1 (de) * 1991-04-26 1992-10-28 Zweckform Etikettiertechnik Gesellschaft Mit Beschränkter Haftung Etikett
WO1993016877A1 (en) * 1992-02-19 1993-09-02 Borealis Polymers Oy Laminate and production method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3037250A1 (de) * 1980-10-02 1982-04-29 Joachim 7440 Nürtingen Dudzik Selbstklebeetikett
WO1990005088A1 (en) 1988-11-07 1990-05-17 Brandt Manufacturing Systems, Inc. Container label and system for applying same
EP0503112A1 (de) * 1991-03-13 1992-09-16 Töpfer Kulmbach GmbH Mechanisch ablösbares Etikett für handelsfähige Gegenstände aller Art, wie Flaschen u.dgl. mehr
EP0510403A1 (de) * 1991-04-26 1992-10-28 Zweckform Etikettiertechnik Gesellschaft Mit Beschränkter Haftung Etikett
WO1993016877A1 (en) * 1992-02-19 1993-09-02 Borealis Polymers Oy Laminate and production method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116080294A (zh) * 2022-12-12 2023-05-09 库尔兹压烫科技（合肥）有限公司 转移膜、用于制造转移膜的方法和用于回收转移膜的方法
CN116080294B (zh) * 2022-12-12 2024-03-26 库尔兹压烫科技（合肥）有限公司 转移膜、用于制造转移膜的方法和用于回收转移膜的方法

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