US20110215018A1 - Label, especially for a reusable container - Google Patents

Label, especially for a reusable container Download PDF

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Publication number
US20110215018A1
US20110215018A1 US13/061,998 US200913061998A US2011215018A1 US 20110215018 A1 US20110215018 A1 US 20110215018A1 US 200913061998 A US200913061998 A US 200913061998A US 2011215018 A1 US2011215018 A1 US 2011215018A1
Authority
US
United States
Prior art keywords
contraction
polymeric film
film layer
label
layer
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.)
Abandoned
Application number
US13/061,998
Other languages
English (en)
Inventor
Steffen Schneider
Harry Johlke
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.)
CCL Label Meerane GmbH
Original Assignee
CCL Label Meerane GmbH
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=41600429&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=US20110215018(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by CCL Label Meerane GmbH filed Critical CCL Label Meerane GmbH
Assigned to CCL LABEL MEERANE GMBH reassignment CCL LABEL MEERANE GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: JOHLKE, HARRY, SCHNEIDER, STEFFEN
Publication of US20110215018A1 publication Critical patent/US20110215018A1/en
Abandoned legal-status Critical Current

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    • Y10T428/24851—Intermediate layer is discontinuous or differential

Definitions

  • the invention relates to a label which is adapted to be adhered to an article, in particular a beverage bottle, and adapted to be detached in a washing liquid at a washing temperature of at least 50° C.
  • containers bottles, for example—are used more than once. On each return, these reusable containers are cleaned prior to refilling, and even labels adhered to the container are washed off, before the containers are refilled and relabeled.
  • a label suitable for labeling reusable containers, more particularly beverage bottles, is known from EP 0 951 004 B1.
  • the label is in the form of a laminate which comprises a biaxially stretched polymeric film layer which shrinks at the washing temperature, a printed decoration layer, and a pressure-sensitive adhesive layer for adhering the label to the container.
  • the polymeric film layer shrinks, i.e., contracts, to overcome the holding force of the adhesive layer adhered to the container, and so the label parts from the container.
  • the adhesive is a redispersible adhesive which on contact with the washing liquid becomes neutralized, i.e., loses its adhesive force, thereby preventing reattachment of the label to the container.
  • the stretched polymeric film layer begins to shrink only when a certain initial temperature is reached. As the temperature increases, the energy stored in the stretched polymeric film as a result of the stretching operation is then partly or entirely released. Since the label is fixed on the container by the adhesion force of the pressure-sensitive adhesive, it is necessary to ensure that the contraction force which develops in the polymeric film exposed to the hot washing liquid exceeds the adhesion force by which the adhesive layer holds the label on the container.
  • the label is intended to adhere reliably to the varying surfaces under different storage conditions at temperatures, for example, between 2 and 55° C. and at different humidity levels (e.g., between 10% and 100% relative humidity), or, in the case of prelabeled bottles or bottles in the course of return, even under conditions of frost or strong solar irradiation.
  • the pressure-sensitive adhesive must achieve comparatively high levels of adhesion force. Nevertheless, the intention is that the label can be reliably detached under industrial conditions and as far as possible without mechanical detachment aids, such as brushes, for example.
  • the invention is based on a label which is adapted to be adhered to an article, more particularly a beverage bottle, and is adapted to be detached in a washing liquid at a mandated washing temperature in a temperature range between about 50° C. and about 95° C.
  • the label is in the form of a laminate comprising at least the following layers:
  • the achievement of the above object is characterized in that the polymeric film layer is designed such that the laminate, at the mandated washing temperature and within a maximum time span of less than 5 minutes, more particularly less than 3 minutes, and with the polymeric film layer being allowed to freely contract in its two stretching directions, achieves maximum degrees of contraction which differ from one another by less than 50%, and in that the stretched polymeric film layer is, further, designed in such a way that the laminate, in the two stretching directions of the polymeric film layer, at the mandated washing temperature and within the maximum time span, attains a contraction tension of at least 0.6 N/mm 2 and a degree of contraction of at least 0.5%.
  • the invention is based on the finding that it is important not only to increase the contraction force of the stretched polymeric film layer to a level which is sufficient to overcome the adhesion force of the adhesive layer but also to obey the time gradient with which the polymeric film layer and hence the laminate recontracts, i.e., shrinks, in the hot washing liquid.
  • the polymeric film layer in the laminate if allowed to freely contract, shrinks in its two stretching directions in an at least approximately uniform manner, i.e., with a difference in degree of contraction of less than 50% (based on the higher degree of contraction).
  • the degrees of contraction in the two stretching directions are to remain at advantageously less than 65%, but more particularly less than 50% (based on the stretched original condition).
  • the values for the degree of contraction and the contraction tension, respectively, that are mentioned here and below are the values which are achieved within the mandated maximum wash removal time span, and can also be exceeded if the wash removal time span is extended. Where values are reported here and below for the degree of contraction, the values in question are always those which develop on free contraction of the laminate, i.e., in a state in which the laminate is not adhered to the article.
  • Conventional shrinking labels negligibly shrink in machine direction, i.e., in the lengthwise direction of the stretched film utilized for label production, and generate a high degree of contraction within a short term, i.e., within a fraction of the predetermined maximum time span of, for example, 3 minutes.
  • a degree of contraction of 70% in the cross direction of the polymeric film is developed which allows a high tension in the laminate. This can lead to splitting in the layer construction of the label.
  • the difference in the degrees of contraction between the two stretching directions is limited to less than 50%.
  • the extent of the degrees of contraction in the two stretching directions is limited to less than 65%, more particularly less than 50%, as well.
  • the wash removal time span is intended advantageously to be at least 2 minutes. Instances of stress splitting in the laminate, as for example in the ink layer of the decoration layer, which lead to residues, for example, of ink and pressure-sensitive adhesive on the article after the label has been detached, are avoided in this way.
  • the uniformity with which the contraction forces (contraction tensions) develop in both stretching directions is one of the factors contributing to the ability of the label to detach in both stretching directions within the wash removal time span of industrial washing installations, of 3 minutes, for example, without splitting of the label assembly, in spite of the degrees of contraction being reduced as compared with those of conventional labels. Since the degrees of contraction in the two stretching directions of the polymeric film layer have been at least approximately matched to one another, the ink materials of the decoration layer are less heavily compressed on contraction as compared with a substantially monoaxially stretched polymeric film layer, and this promotes the adhesion force of the ink material and prevents splitting.
  • a minimum threshold value of the degree of contraction of the polymeric film layer of 0.5% is sufficient to part the label from the container in the hot washing liquid if at the same time a contraction tension of at least 0.6 N/mm 2 is attained.
  • the values in question are threshold values, which may be exceeded in the wash removal operation.
  • the stretched polymeric film layer is preferably designed in such a way that in the laminate in its two stretching directions, at a washing temperature of at least 70° C. and within the maximum time span, a degree of contraction of at least 4% and a contraction tension of at least 1.5 N/mm 2 are attained. It has proven particularly favorable in this context if the stretched polymeric film layer in the laminate in its two stretching directions, and at a washing temperature of at least 80° C., within the maximum time span, attains a degree of contraction of at least 2% and a contraction tension of at least 0.8 N/mm 2 . In this context it is possible to exploit the fact that at 80° C. the adhesion force of the adhesive will be smaller than at 70° C.
  • the polymeric film layer ought in both stretching directions to have a degree of contraction which, in both stretching directions, develops as uniformly as possible and ought to achieve a comparatively high contraction tension at the washing temperature.
  • stretched polymeric film layers made from a plastics material based on polyethylene terephthalate (PET).
  • PET polyethylene terephthalate
  • Other polymers as well are suitable such as polyvinyl chloride (PVC), polystyrene (PS), polypropylene (PP), polyethylene (PE), polylactic acid (PLA) or cycloolefin copolymers (COC), for example.
  • the stretched polymeric film layer ought to be composed of a comparatively stiff material, in order to allow the decoration layer to be printed with particular precision and the label to be dispensed subsequently with exactness and speed onto the container.
  • the polymeric film layer has an elasticity modulus of at least 2500 MPa (particularly in the machine direction of the film strip), which can be achieved in particular with PET films.
  • the layer construction of the label may take place conventionally, as for example by the stretched polymeric film layer being a layer constituent of a film composite layer and being joined to at least one further polymeric film layer to form the film composite layer, in order to optimize the contraction force in the label on detachment.
  • the further polymeric film layer may be an unstretched or a monoaxially stretched polymeric film layer which recontracts on exposure to heat, but here as well the further polymeric film layer is preferably biaxially stretched.
  • the polymeric film layers may be joined in the manner of a laminate, as for example by means of a laminating adhesive or the like; alternatively they may be coextruded.
  • the security against splitting of the label during wash removal is increased if the adhesive layer is composed in particular of a pressure-sensitive adhesive material, being formed of crosslinking polymer and being joined to the laminate via an interlayer which serves as an adhesion promoter and consists of crosslinking laminating adhesive.
  • the laminating adhesive crosslinks with the adhesive layer, and this increases the splitproofness.
  • the interlayer preferably comprises as its base substance a two-component polyurethane adhesive.
  • the adhesive layer advantageously comprises as its base substance an adhesive, more particularly a pressure-sensitive adhesive, which can be excited to crosslinking by radiation, as for example by electron beams, but more particularly by ultraviolet light.
  • the polymer film layer is composed advantageously of transparent plastics material, with the printed decoration layer being disposed in the laminate between the polymeric film layer and the adhesive layer, which is designed preferably as a pressure-sensitive layer, in order to protect the decoration layer from mechanical damage.
  • the decoration layer and the adhesive layer or pressure-sensitive adhesive layer may be disposed on opposite sides of the stretched polymeric film layer, in which case the decoration layer is disposed advantageously between the stretched polymeric film layer and a protective layer which finishes off the label toward the outside.
  • the protective layer may be a polymeric film layer and more particularly may be a polymeric film layer which is able to shrink monoaxially or biaxially on exposure to heat.
  • the protective layer may be a varnish layer, more particularly comprising a crosslinking material, and preferably a two-component material.
  • the invention in a second aspect relates to a container having a label of the invention adhered thereto, and in a third aspect the invention also relates to a method of adhering a label of the invention to an article, more particularly to a beverage bottle.
  • FIG. 1 shows a container with a label in accordance with the invention adhered to its outer periphery at the beginning of detachment in a washing liquid;
  • FIG. 2 shows a section through the container and the label, viewed along a line II-II in FIG. 1 ;
  • FIG. 3 shows a sectional view through a variant of the label from FIG. 1 , at the beginning of detachment;
  • FIG. 4 shows a further variant of the label from FIG. 1 , at the beginning of detachment.
  • FIGS. 1 and 2 show a label, designated generally by 1 , which is adhered to a substantially cylindrical outer surface 3 of a container 5 , as for example of a multi-use beverage bottle, in a condition in which the label 1 is beginning to detach, almost simultaneously from all four edges 7 , in a hot washing liquid (not shown). In the condition before the detachment of the label 1 , it is adhered up to the edges 7 to the surface 3 of the container 5 .
  • the label 1 is designed as a laminate and has a biaxially stretched polymeric film layer 9 which shrinks, i.e., contracts, in both stretching directions at the washing temperature of the washing liquid of, for example, about 80° C.
  • the layer 9 is composed of transparent plastics material and bears, on its side facing the container 5 , a printed decoration layer 11 , which is visible from the outside through the polymeric film layer 9 .
  • Applied to the decoration layer 11 is an adhesive layer 13 composed of a pressure-sensitive adhesive material, which bonds the label 1 to the container 5 .
  • the polymeric film layer 9 is preferably composed of a polyethylene terephthalate (PET) plastics material which is biaxially stretched and which in both of its stretching directions has maximum degrees of contraction which differ, when the polymeric film material is heated in the washing liquid, while allowing free contraction of the laminate, by less than 50% (based on the higher degree of contraction).
  • the degree of contraction in each of the two stretching directions is less than 65%, more particularly less than 50% (based on the stretched original condition).
  • the polymeric film layer 9 is configured such that the stated values are achieved within a washing time span of approximately 5 minutes, advantageously of about 3 minutes, which is customary for reusable containers in industrial washing installations.
  • the contraction parameters of the polymeric film layer 9 are set such that the laminate in the two stretching directions of the polymeric film layer 9 , during the washing time span and at a washing temperature of at least 50° C., attains a contraction tension of at least 0.6 N/mm 2 with a degree of contraction of at least 0.5%. It has been found that, if these parameters are observed, the label can be washed off on the basis of the biaxial stretching of the polymeric film material.
  • the values for contraction tension and degree of contraction that are selected may also be higher, in order to increase the reliability of detachment.
  • the washing temperature in many cases can be selected to be higher than 50° C.
  • maximum values for the contraction tension and the degree of contraction ought not to be exceeded. It has emerged as being suitable if the polymeric film layer 9 is designed such that the laminate in the two stretching directions of the polymeric film layer, within the mandated wash removal time span of, for example, 3 minutes at a washing temperature of 60° C., does not exceed a contraction tension of maximally 3.5 N/mm 2 and a degree of contraction of maximally 20%, but more particularly maximally 13%. At a washing temperature of 70° C.
  • the contraction tension should be below a maximum of 15 N/mm 2 , in particular below a maximum of 12 N/mm 2 , while the degree of contraction should be maximally 55%, more particularly maximally 36%.
  • the contraction tension ought not to exceed a value of maximally 18 N/mm 2 and a degree of contraction of maximally 60%, in particular maximally 46%.
  • the contraction tension ought not to exceed maximally 20 N/mm 2 and a degree of contraction of maximally 65%, more particularly maximally 50%.
  • the polymeric film layer 9 ought in its two stretching directions to obtain a degree of contraction of at least 4% for a contraction tension of at least 1.5 N/mm 2 during a washing time span of 3 minutes.
  • the degree of contraction achieved in both stretching directions within the washing time span of 3 minutes ought to be at least 2%, and the contraction tension achieved under the same conditions ought to be at least 0.8 N/mm 2 .
  • the degree of contraction of the polymeric film layer 9 is less directionally dependent and considerably smaller than the degree of contraction of the polymeric film layer of conventional labels that are removable by washing, as shown by Table below for PET films:
  • the free contraction of the films was determined, by immersing the films for three minutes in water at the corresponding temperature.
  • the degree of contraction in lengthwise direction is the degree of contraction in the longitudinal film web direction of the film production machine.
  • the degree of contraction in the crosswise direction identifies the degree of contraction transverse to the longitudinal machine direction.
  • Table 2 shows the maximum contraction tension of a PET film approximately 50 ⁇ m thick, as used in accordance with the invention, in comparison to a PET film of the prior art.
  • the maximum contraction tension developed on the PET film in accordance with the invention in both stretching directions is greater than the maximum contraction tension of conventional films.
  • the table shows the maximum contraction tensions in comparison.
  • the contraction tension is determined in accordance with DIN 53 369, the temperature being altered linearly at 20° K/h from 30 to 105° C. in a measurement chamber, instead of the DIN change rate of 50 or 120° K/h. With a rate of change of 20° K/h, the residence time is approximately 3 minutes at a temperature which is representative of the washing temperature.
  • the printed decoration layer 11 is protected beneath the polymeric film layer 9 , which where appropriate may also serve as a production carrier for the label.
  • the adhesive layer 13 may be applied directly to the ink layer 11 .
  • the interlayer 15 may be a conventional primer layer.
  • the interlayer 15 is a reactive layer of two-component polyurethane laminating adhesive, which is able to crosslink not only with the decoration layer 11 but also with the adhesive layer 13 .
  • the adhesive layer 13 is likewise composed of crosslinking polymer, more particularly of a crosslinking system which can be excited by radiation, such as, for example, UV-excitable adhesive material.
  • the interlayer 15 raises the splitting resistance of the label 1 .
  • FIGS. 1 and 2 variants of the label of FIGS. 1 and 2 are illustrated. Components having an equivalent effect are identified with the reference numbers of FIGS. 1 and 2 , and to distinguish them are given a letter. For elucidation of the construction, the mode of action, and any variants, reference is made to the description of FIGS. 1 and 2 .
  • FIG. 3 shows a label 1 a adhered to the outer surface 3 a of the container 5 a at the beginning of the detachment procedure.
  • the decoration layer 11 a is printed via a primer layer 17 onto the biaxially stretched polymeric film layer 9 a .
  • the decoration layer 11 a is disposed between the adhesive layer 13 a and the polymeric film layer 9 a .
  • the biaxially stretched polymeric film layer 9 a is a constituent of a laminate composite layer 19 in which the biaxially stretched polymeric film layer 9 a is joined two-dimensionally via an adhesive layer 21 , for example, of laminating adhesive, to a further polymeric film layer 23 .
  • the overall laminate composite layer 19 is transparent, and so the decoration layer 11 a remains visible from the outside.
  • the polymeric film layer 23 is a monoaxially stretched film or, as is preferred in order to lessen the stresses in the assembly of materials, is likewise a biaxially stretched film.
  • the polymeric film layer 23 may also be of a non-shrinking design. In that case the contraction force of the label 1 a would be reduced. If layers 9 a and 23 which contract differently are laminated, the direction of the detachment movement of the label on contraction may be influenced and the detachment behavior may be improved.
  • the decoration layer in the laminate is located between the biaxially stretched polymeric film layer and the adhesive layer.
  • the adhesive layer 13 b is attached directly, or else, if appropriate, via an adhesive promoter layer, to the biaxially stretched polymeric film layer 9 b , while the decoration layer 11 b is printed onto the opposite side of the polymeric film layer 9 b , which here as well serves as a production carrier.
  • Attached to the decoration layer 11 b via an adhesion promoter layer 25 e.g., a laminated adhesive layer, is a protective layer 27 .
  • the protective layer 27 may be a layer of protective varnish, or else a further, stretched or unstretched, polymeric film layer.
  • the polymeric film layer may be biaxially or monoaxially stretched.
  • the protective layer 27 is configured as a layer of protective varnish
  • an adhesion promoter layer 25 e.g., a layer of laminating adhesive between the protective layer 27 and the decoration layer 11 b .
  • An option would be the use of an adhesion promoter layer in the form of a primer on the polymeric film layer 9 b . In such a case the decoration layer 11 b and the adhesion promoter layer 25 switch their positions with one another in FIG. 4 .
  • the decoration layer 11 b may also be applied to that polymeric film, and may be fixed to the polymeric film layer 9 b via the adhesion promoter layer 25 , more particularly a layer of laminating adhesive.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Laminated Bodies (AREA)
  • Details Of Rigid Or Semi-Rigid Containers (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Adhesive Tapes (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Wrappers (AREA)
US13/061,998 2008-09-03 2009-09-02 Label, especially for a reusable container Abandoned US20110215018A1 (en)

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DE102008045547.4 2008-09-03
DE102008045547A DE102008045547A1 (de) 2008-09-03 2008-09-03 Etikett, insbesondere für einen Mehrwegbehälter
PCT/EP2009/061351 WO2010026163A1 (en) 2008-09-03 2009-09-02 Label, especially for a reusable container

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PL2328988T3 (pl) 2018-01-31
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