DE10147538A1 - Multilayer film useful for label production contains at least 10% of ultra low density polyethylene - Google Patents

Multilayer film useful for label production contains at least 10% of ultra low density polyethylene

Info

Publication number
DE10147538A1
DE10147538A1 DE2001147538 DE10147538A DE10147538A1 DE 10147538 A1 DE10147538 A1 DE 10147538A1 DE 2001147538 DE2001147538 DE 2001147538 DE 10147538 A DE10147538 A DE 10147538A DE 10147538 A1 DE10147538 A1 DE 10147538A1
Authority
DE
Germany
Prior art keywords
polypropylene
density polyethylene
film
adhesive
ldpe
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.)
Granted
Application number
DE2001147538
Other languages
German (de)
Other versions
DE10147538C2 (en
Inventor
Edgar Schubert
Rainer Schumacher
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.)
Renolit SE
Original Assignee
Renolit Werke 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
Application filed by Renolit Werke GmbH filed Critical Renolit Werke GmbH
Priority to DE2001147538 priority Critical patent/DE10147538C2/en
Priority claimed from DE10228273A external-priority patent/DE10228273B4/en
Publication of DE10147538A1 publication Critical patent/DE10147538A1/en
Application granted granted Critical
Publication of DE10147538C2 publication Critical patent/DE10147538C2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09FDISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/04Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps to be fastened or secured by the material of the label itself, e.g. by thermo-adhesion
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/32Layered products comprising a layer of synthetic resin comprising polyolefins
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B2037/148Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers whereby layers material is selected in order to facilitate recycling of the laminate
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2323/00Polyalkenes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2519/00Labels, badges
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/15Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
    • B32B37/153Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state at least one layer is extruded and immediatly laminated while in semi-molten state

Abstract

The present invention relates to a multilayer film for the production of labels, comprising two outer layers made of low-density polyethylene, a core layer made of highly crystalline polypropylene or of a mixture with up to 20% low-density polyethylene, and adhesion-promoting layers made of polypropylene and LDPE, the adhesion-promoting layers 15 Contain -30% ULDPE (d 0.87), 60-25% LDPE and 20-50% polypropylene, as well as a process for producing such films.

Description

  • The present invention relates to a multilayer film for the production of Labels made from two outer layers of polyethylene and a core layer Polypropylene, which is held together by adhesion-promoting layers become.
  • Label films made of plastic have long been known in the prior art. Originally, films were made of mono- or biaxially oriented polyesters or in Machine-oriented polypropylene used. The label film will printed, provided with an adhesive layer and a release film or release liner applied. The combination of release film, adhesive layer and label film is punched so that the film and adhesive layer separate, but the release film as continuous tape is retained. The waste is removed as a lead frame, so that a sequence of separate label sections remains on the release film.
  • When the labels are applied to the substrate to be labeled, the Release film deflected with a small bending radius at a large angle, whereby the relatively stiff label section detaches from the release film and onto the Substrate can be pressed. The stiffness of the label section must be be so large that the part of the Label section "floating" up to the point of application to the label Substrate can be pushed without getting out of the intended path herauszubiegen.
  • A disadvantage of the known films is that for automatic Labeling systems required sufficient stiffness of the label sections only from some, especially through a costly orientation in the machine direction additionally stiffened plastic materials is achieved. These include for example polypropylene or polyethylene terephthalate. Furthermore, there are Poorly printable plastics, so that it is also an expensive one Printing primer must be applied.
  • Imprintable plastics such as or directly after a corona treatment Polyethylene, on the other hand, are too soft so that they are not suitable for the production of label films can be used.
  • It has therefore been tried several times to produce label films by a relatively thick and rigid core layer made of polypropylene or one Polypropylene / polyethylene mixture laminated with a thin layer of polyethylene, which is printable. To prevent the film from bending or curling Prevent processing so that this lies with the processing plan preferably another polyethylene film is also laminated on the back. There Polyethylene and polypropylene films adhere poorly to one another, it is further known, in each case an adhesive or between the above layers Introduce sealing layer, which consists of EVA, EMA or a Polypropylene / polyethylene low density mixture exists (see. EP 0 950 511 A2, DE 198 59 789 C1 and WO 00/08622). To recycle label waste enable, it is preferred that the adhesive layers as well as the actual films made of polyolefin (see. DE 198 59 789). Unfortunately, such show Composite layers made of pure polyolefins in the production by coextrusion insufficient layer adhesion, so that when processing, especially when printing on the labels and when removing them from the base partial detachments occur. The insufficient layer adhesion can be tested by pressing an adhesive tape and peeling it off, whereby the layers can be partially or completely separated from each other. This behavior is independent of the mixing ratio Polypropylene and polyethylene can be mixed together as an adhesive layer.
  • The task therefore was to find new adhesion promoters, one of whom sufficient bond adhesion is achieved, and which are made of polyolefin to to enable recycling together with the other film materials.
  • This object is achieved by the features of the main claims and promoted by the subclaims.
  • Surprisingly, this object is achieved in that the known adhesion-promoting mixture of polypropylene and low-density polyethylene (LDPE) admits a very low density polyethylene (ULDPE). The adhesion-promoting layer contains 20-50% by weight polypropylene, 60-25% LDPE and 15-30% ULDPE. A linear polyethylene can also be used instead of LDPE Density (LLDPE) can be used.
  • The polypropylene is preferably the same as that used as the core layer. It usually has a density of 0.90-0.92 g / cm 3 , a melt index MFI 230 ° C / 2.16 kg of 3-20, in particular 5-10 g / 10 min and a melting range of 150-180 ° C. For the sufficient rigidity of the core layer, the polypropylene should also have an elastic modulus of more than 1600 MPa, in particular more than 1800 MPa and particularly preferably (measured according to ISO 178) 2000-2100 MPa.
  • The composition of the low-density polyethylene in turn corresponds to what is used as the outer cover layer, products with a density of 0.90 to 0.940 g / cm 3 , and in particular 0.925-0.940, being particularly suitable for the formation as a film. These polyethylenes have a melt index MFI 190 ° C./2.16 kg of 0.1-22 g / 10 min, a melt index of 1-8 g / 10 min is preferred. The melting range is 100-135 ° C.
  • The very low density polyethylene (ULDPE) has a density of less than 0.90 g / cm 3 , in particular equal to or less than 0.875 g / cm 3 . Melt index and melting range are in the same range as given above for LDPE.
  • The core layer consists of one as described above Polypropylene mass of up to 20%, preferably 5-10%, low density polyethylene (LDPE) can be added to improve the breaking strength and elasticity. Larger quantities have a negative impact on the rigidity of the film. As polypropylene a relatively high crystallinity polypropylene is preferably used, which has good rigidity in all directions and therefore not by stretching must be oriented. The polypropylene core layer is usually 20-80 µm, in particular 40-60 microns thick.
  • A commercially available low-density polyethylene is used as the outer cover layers (LDPE) of the above specification. The layer thickness of this Cover layers is between 3 and 10, preferably 6-8 microns.
  • The adhesive layers have a layer thickness of 2-10, preferably about 6-8 µm thickness.
  • The overall composite has a thickness of preferably 40-100 μm, in particular layer thicknesses of 60-80 μm are preferred. The overall network has one E-modulus (tensile modulus, measured according to DIN EN ISO 527-3 / 2/10) of over 1000 MPa, preferably 1100-1400 MPa.
  • For the production of label films, one side of the composite is still with one usual adhesive adhesive and a release film and the other Top layer, if necessary, by a corona treatment for better adhesion of the printing ink treated.
  • The five layers are extruded using a suitable 5-channel cassette Temperatures of about 200-260 ° C, preferably about 240 ° C. The one corresponding slot die emerging composite is in free fall via a Cooling roller deducted, which has a surface temperature of 30-95 ° C, preferably 50-60 ° C, which results in optically clear rigid rigid Result in foils.
  • If desired, the above layers can also be used Pigments colored or roughened by fillers such as titanium dioxide or chalk and made opaque and additionally stiffened. On the related Measures of the prior art are hereby referred.
  • Examples
  • In a 5-layer coextrusion line from the Reifenhäuser brand, plastic mixtures of the composition given in the table below are coextruded, layer material C forming layers 1 and 5 , material B forming layers 2 and 4 and material A forming layer 3 , as is is shown in Fig. 1. Layers 1 and 5 have an average thickness of 7 µm, layers 2 and 4 have an average thickness of 7 µm and layer 3 has an average thickness of 47 µm. The composite layer emerging from the extruder at a temperature of about 200-260 ° C is cooled on a chill roll at a temperature of 50-60 ° and rolled up for storage.
  • The stiffness of the foils is determined using the modulus of elasticity according to the DIN EN method ISO 527-3 / 2/10 determined.
  • Layer adhesion for coextruded or multilayer films test equipment
  • Punching iron 100 × 100 mm
  • Adhesive tape type 54108, 15 mm wide, from INTERTAPE
  • sample preparation
  • You lay several layers, approx. 25 pieces of foil on top of each other and die cut with Punching iron on a punching pad.
  • The punched edges should be punched smooth and clean.
  • The top and bottom films are discarded.
  • Separate foils, remove 2 pieces of foil.
  • Two individual pieces of film are placed on the worktop of the test room (= hard, smooth surface).
  • A total of 8 adhesive strips (type 54108) of 70 mm length are half glued onto the film edges as follows:
    • - Stick the adhesive strip on the side treated with corona (if treated)
    • - 4 strips at an angle of 30 ° along the edges of the 1st piece of film
    • - 4 strips at an angle of 45 ° along the edges of the 2nd piece of film
  • The adhesive strips are applied with a fingernail with strong pressure on the film wiped out.
  • After a waiting time of 20 seconds, the tapes are pulled off suddenly at an angle of 135 °.
  • If all 6 adhesive strips have been peeled off, the film remains everywhere on the edges undamaged, the test was passed = pos.
  • As soon as parts of a film layer are removed from the film when a tape is removed torn out or entire layers are pulled off, the test is not passed neg.
  • On the one hand, the optical properties of the films are determined by a pure Compared to each other. It is particularly important here that one if possible little distortion occurs in the background viewed through the slide. On Another criterion is that the films have the least possible haze. The degree of turbidity is determined using the ASTM D1003-92 method.
  • In the following table there are non-distorting, undisturbed films in the line "Optics" with "pos." and distorted or cloudy films with "neg." designated.



  • The above examples show that only a ULDPE content of more than 10% ensures a firm bond between the layers.

Claims (5)

1. multilayer film for the production of label material, comprising two outer layers ( 1 , 5 ) made of low-density polyethylene, a core layer ( 3 ) made of highly crystalline polypropylene or a mixture with up to 20% low-density polyethylene and adhesive layers ( 2 , 4 ) made of polypropylene and LDPE, characterized in that the adhesion-promoting layers contain 15-30% ULDPE (d ≤ 0.875), 60-25% LDPE and 20-50% polypropylene.
2. Film according to claim 1, characterized in that the outer layers ( 1 , 5 ) 10-30% of the film thickness, the adhesive layer ( 2 , 4 ) 10-30% of the film thickness and the core layer ( 3 ) 60-90% of Makes up a total film thickness of approx. 40-100 µm.
3. Film according to claim 1 or 2, characterized in that the core layer ( 3 ) to over 90% of polypropylene with a density of 0.90-0.92 g / cm 3 , a melt index of 5-10 g / 10 min (MFI 230 ° C / 2.16 kg) and a melting range of 150-180 ° C, an E-modulus (c178) of over 1600 MPa, in particular over 2000 Mpa, which is made with low density polyethylene (LDPE) with a Density of 0.90-0.940 g / cm 3 , a melt index of 0.1-22 g / 10 min (MFI 190 ° C / 2.16 kg) and a melting range of 100-135 ° C in an amount of 2- 20% exists.
4. A process for the production of films according to any one of claims 1-3, characterized in that the plastics over a 5-layer coextrusion line at temperatures of 200-250 ° C and shaped over a Chill roll with a surface temperature of 40-70 ° C, preferably 50-60 ° C, are solidified.
5. Use of films according to one of claims 1-3 for the production of labels, which are attached to a release film using an adhesive adhesive are attached.
DE2001147538 2001-09-26 2001-09-26 Multi-layer film for the production of labels Expired - Fee Related DE10147538C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE2001147538 DE10147538C2 (en) 2001-09-26 2001-09-26 Multi-layer film for the production of labels

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2001147538 DE10147538C2 (en) 2001-09-26 2001-09-26 Multi-layer film for the production of labels
DE10228273A DE10228273B4 (en) 2001-09-26 2002-06-25 Multi-layer film for the production of labels, process for their preparation and their use

Publications (2)

Publication Number Publication Date
DE10147538A1 true DE10147538A1 (en) 2003-04-17
DE10147538C2 DE10147538C2 (en) 2003-07-24

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Family Applications (1)

Application Number Title Priority Date Filing Date
DE2001147538 Expired - Fee Related DE10147538C2 (en) 2001-09-26 2001-09-26 Multi-layer film for the production of labels

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DE (1) DE10147538C2 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1508439A1 (en) * 2003-08-16 2005-02-23 Renolit AG Multilayer film for the manufacture of labels
WO2006002806A1 (en) * 2004-07-01 2006-01-12 Unilever N.V. Laminate
EP1813423A1 (en) 2006-01-27 2007-08-01 RKW AG Rheinische Kunststoffwerke Transparent, stiff and printable polypropylene blown films
WO2007149900A2 (en) * 2006-06-20 2007-12-27 Avery Dennison Corporation Multilayered polymeric film for hot melt adhesive labeling and label stock and label thereof
DE102007045117A1 (en) * 2007-09-20 2009-04-09 Nordenia Deutschland Gronau Gmbh label film
US9662867B2 (en) 2006-06-14 2017-05-30 Avery Dennison Corporation Conformable and die-cuttable machine direction oriented labelstocks and labels, and process for preparing
US9676532B2 (en) 2012-08-15 2017-06-13 Avery Dennison Corporation Packaging reclosure label for high alcohol content products
USRE46911E1 (en) 2002-06-26 2018-06-26 Avery Dennison Corporation Machine direction oriented polymeric films and methods of making the same

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1541341A1 (en) * 2003-12-05 2005-06-15 Alcan Technology & Management Ltd. Laminate with two outer polyethylene films
EP1541344A1 (en) * 2003-12-05 2005-06-15 Alcan Technology & Management Ltd. Laminate with two outer polyethylene films
EP1547765A1 (en) * 2003-12-19 2005-06-29 Alcan Technology & Management Ltd. Laminate with a decorative surface and two outer polyethylene layers
EP1543954A1 (en) * 2003-12-19 2005-06-22 Alcan Technology & Management Ltd. Laminate with a decorative surface and two outer polyethylene layers

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0950511A2 (en) * 1998-04-17 1999-10-20 Avery Dennison Corporation Multilayer films and labels
WO2000008622A1 (en) * 1998-08-07 2000-02-17 Advanced Elastomer Systems, L.P. Soft touch labels
DE19859789C1 (en) * 1998-12-23 2000-06-08 M & W Verpackungen Gmbh Recyclable label film consists of a polypropylene core layer arranged between two polyethylene cover layers

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0950511A2 (en) * 1998-04-17 1999-10-20 Avery Dennison Corporation Multilayer films and labels
WO2000008622A1 (en) * 1998-08-07 2000-02-17 Advanced Elastomer Systems, L.P. Soft touch labels
DE19859789C1 (en) * 1998-12-23 2000-06-08 M & W Verpackungen Gmbh Recyclable label film consists of a polypropylene core layer arranged between two polyethylene cover layers

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE46911E1 (en) 2002-06-26 2018-06-26 Avery Dennison Corporation Machine direction oriented polymeric films and methods of making the same
EP1508439A1 (en) * 2003-08-16 2005-02-23 Renolit AG Multilayer film for the manufacture of labels
WO2006002806A1 (en) * 2004-07-01 2006-01-12 Unilever N.V. Laminate
EP1813423A1 (en) 2006-01-27 2007-08-01 RKW AG Rheinische Kunststoffwerke Transparent, stiff and printable polypropylene blown films
WO2007085283A1 (en) * 2006-01-27 2007-08-02 Rkw Ag Transparent, stiff and printable polypropylene blown films
US9662867B2 (en) 2006-06-14 2017-05-30 Avery Dennison Corporation Conformable and die-cuttable machine direction oriented labelstocks and labels, and process for preparing
WO2007149900A3 (en) * 2006-06-20 2008-02-14 Avery Dennison Corp Multilayered polymeric film for hot melt adhesive labeling and label stock and label thereof
US9636895B2 (en) 2006-06-20 2017-05-02 Avery Dennison Corporation Multilayered polymeric film for hot melt adhesive labeling and label stock and label thereof
WO2007149900A2 (en) * 2006-06-20 2007-12-27 Avery Dennison Corporation Multilayered polymeric film for hot melt adhesive labeling and label stock and label thereof
DE102007045117A1 (en) * 2007-09-20 2009-04-09 Nordenia Deutschland Gronau Gmbh label film
US9676532B2 (en) 2012-08-15 2017-06-13 Avery Dennison Corporation Packaging reclosure label for high alcohol content products

Also Published As

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