EP2018268A1 - Nouveaux papiers d'emballage - Google Patents

Nouveaux papiers d'emballage

Info

Publication number
EP2018268A1
EP2018268A1 EP07727876A EP07727876A EP2018268A1 EP 2018268 A1 EP2018268 A1 EP 2018268A1 EP 07727876 A EP07727876 A EP 07727876A EP 07727876 A EP07727876 A EP 07727876A EP 2018268 A1 EP2018268 A1 EP 2018268A1
Authority
EP
European Patent Office
Prior art keywords
layer
wrapper
wrappers
dynes
bars
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Withdrawn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
EP07727876A
Other languages
German (de)
English (en)
Inventor
Abhay Arun Bhagwat
Shailey Shazada Malik
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.)
Unilever PLC
Unilever NV
Original Assignee
Unilever PLC
Unilever NV
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 Unilever PLC, Unilever NV filed Critical Unilever PLC
Publication of EP2018268A1 publication Critical patent/EP2018268A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B32B29/06—Layered products comprising a layer of paper or cardboard specially treated, e.g. surfaced, parchmentised
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/10—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/16—Layered products comprising a layer of synthetic resin specially treated, e.g. irradiated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/12—Coating on the layer surface on paper layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/514—Oriented
    • B32B2307/518—Oriented bi-axially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2553/00—Packaging equipment or accessories not otherwise provided for

Definitions

  • the present invention relates to wrappers for articles, particularly for detergent bars.
  • Detergent bars are conventionally manufactured by extrusion process in which a pre-formed composition comprising all components of the bar is plodded and extruded through an eye-plate, to form a continuous "rod” , which is then cut into smaller pieces of predetermined length, commonly- referred to as “billets” or bars. These billets are fed through a stamper, wrapped and packaged to make them ready for the consumer. Similar process, with appropriate modifications is followed to make conventional soap and dish-wash bars. Generally, such bars are wrapped in heat sealable Polyethylene based laminated wrappers.
  • Bars are wrapped in an envelope wrapping format wherein the outermost and innermost layers are sealed to each other, either using adhesives or by heat-sealing. Such individually wrapped bars are then stacked one above the other and collectively packed, generally in corrugated paper board boxes. These boxes are stored in godowns for usually 1 to 2 weeks, before they are opened at retail outlets to remove the individually wrapped bars.
  • Temperature of the detergent bars is typically in the range of 60 to 85 0 C.
  • hot detergent bars are wrapped in conventional heat-sealable Polyethylene wrappers having laminated outer and inner layers of polyethylene, with a layer of stiffening material, such as paper, in between the two. It is commonly observed that the wrappers stick to each other inside the corrugated paper board boxes, which leads to a failure of the wrapper/packaging, commonly referred to as "bunching" in the packaging industry.
  • non heat-sealable wrappers which are be sealed by using suitable adhesives, generally hot melt adhesives.
  • suitable adhesives generally hot melt adhesives.
  • adhesive coated laminates are costlier than un-coated ones.
  • a common drawback of adhesive bonded wrappers is that the sealed areas frequently open out during storage and transit .
  • Another object of the present invention is to provide wrappers which do not stick to each other during storage and transit .
  • the present inventors have developed novel wrappers for detergent bars after which meet the above objects.
  • the present invention relates to wrappers comprising a layer of polyethyleneterepthalate or bi-axially oriented polypropylene and a layer comprising polymeric alkylene, with an intermediate layer disposed there between, wherein surface tension of the layer comprising polymeric alkylene is greater than 32 dynes/cm.
  • the surface tension is from 36 dynes/cm to 50 dynes/cm and more preferably from 38 to 42 dynes/cm.
  • the present invention relates to wrappers for articles, particularly for detergent bars.
  • the composition is milled i.e. mixed in high-shear mixers and plodded.
  • This composition is later extruded through dies, to form logs or rods, which are cut to required size into bars or billets.
  • These billets are stamped and generally, envelope wrapped in polyethylene wrappers.
  • Enveloped wrapping involves a belly- seal and two side seals.
  • This format requires both the outer and inner layers of the wrapper to have good sealing properties or receptivity towards sealing to give fiber- tear, which is accepted as the visual indication of a good seal.
  • the temperature of the detergent bar composition as it extrudes out of the dies is typically around 60 to 85 deg C.
  • the present inventors have developed novel wrappers that can serve the desired primary and secondary functions of wrappers. These wrappers do not stick to each other during transit and storage and can be used to wrap detergent bars in hot condition. Accordingly, the present invention relates to wrappers comprising a layer of polyethyleneterepthalate or bi-axially oriented polypropylene and a layer comprising polymeric alkylene, with an intermediate layer disposed there between, wherein surface tension of the layer comprising polymeric alkylene is greater than 32 dynes/cm.
  • detergent bar is use herein to include laundry bars, soap bars and dish wash bars.
  • the term "comprising" for the purpose of this invention means wrappers essentially having at least one layer of polyethyleneterepthalate or bi-axially oriented polypropylene and at least one layer that include polymeric alkylene, with at least one intermediate layer situated between the above layers. It is essential according to the invention that when the wrapper is used to wrap articles, particularly detergent bars, the layer of polyethyleneterepthalate or bi-axially oriented polypropylene and the layer comprising polymeric alkylene are sealed to each other, with the article contained therein, the layer of polyethyleneterepthalate or bi-axially oriented polypropylene forming the outermost layer,
  • Preferred thickness of the wrappers of the invention ranges from 30 to 200 microns, more preferably from 60 to 160, further more preferably from 50 to 120 and most preferably from 40 to 100 microns.
  • Polyethyleneterepthalate is also commonly known as PET.
  • Preferred thickness of this layer is from 7 - 100 microns, more preferably 7 to 80 microns and most preferably from 7 to 50 microns.
  • Bi-axially oriented polypropylene is commonly known as BOPP.
  • Preferred thickness of BOPP layer is in the range 7 - 250 microns, more preferably 10 to 200 microns and most preferably from 20 to 100 microns.
  • PET is available in heat-sealable and non-heat sealable grades. It is preferred that the PET layer is not heat sealable, although heat sealable grades can also be used without departing from the scope of this invention.
  • BOPP is also available in heat-sealable and non-heat sealable grades. Non-heat sealable grades of BOPP are preferred over heat-sealable grades.
  • the layers can be preprinted, reverse printed on either side with information pertinent to the product to be covered. This layer provides superior aesthetics and gloss to the wrappers and superior aroma retention.
  • Preferred materials forming the intermediate layer include paper, paperboard, metallized paper, metal foils such as Aluminum foil, vapor deposited metal layer, nylon or ethylene vinyl alcohol. More preferred barrier layer is made from maplitho, poster or chromo paper.
  • This intermediate layer provides superior stiffness to the wrapper, thereby improving its' machinability and transit performance and also acts as a barrier layer.
  • Grammage of this layer is preferably in the range of 30 gsm to 200 gsm, more preferably from 80 to 150 gsm and most preferably from 45 to 80 gsm. It is to be understood that more than one such layers can be used.
  • layer of polymeric alkylene means one or more layers of polymeric alkylenes. Ethylene and Propylene are the preferred alkylenes, suited to the invention.
  • Preferred polymeric ethylene is selected from the group consisting of low density polyethylene, linear low density polyethylene, blends of low density polyethylene with linear low density polyethylene, copolymers of ethylene with methyl acrylate or copolymers of ethylene with vinyl acetate. Low density Polyethylene (LDPE) is preferred over others.
  • LDPE Low density Polyethylene
  • Polypropylene is the preferred polymeric propylene. Preferred grammage of this layer is from 8 gsm to 50 gsm, more preferably from 12 gsm to 20 gsm.
  • this layer of polymeric alkylene is greater than 32 dynes/cm, preferably from 36 dynes/cm from 50 dynes /cm and more preferably from 38 dynes/cm to 42 dynes/cm.
  • Surface tension of the above materials is generally below 30 dynes/cm. It was observed by the present inventors, after experimentation, that for good sealing characteristics, the surface energy of this layer must be above 32 dynes/cm, preferably in the range of 36 to 50 dynes/cm and most preferably in the range of 38 dynes/cm to 42 dynes/cm.
  • the surface tension of the polymeric alkylene layer is increased, preferably by treating the surface with corona discharge, although other forms of treatment such as laser discharge, plasma or flame treatment can also be used.
  • the components of a corona treating system include a power supply, a high-voltage transformer, and the treating station through which the material to be treated passes.
  • the station itself typically comprises an electrode, an electrical insulator or dielectric, and a return path (ground) , and it can be configured in a number of ways to accommodate different materials.
  • the power supply has the function to raise the frequency and voltage of the incoming power to levels sufficient to generate a corona in the station.
  • Power of 1 KW to 2.2 KW is used to get the desired surface tension values of 36 to 50 dynes/cm.
  • the layer comprising polymeric alkylene forms the innermost layer, i.e. the layer, which is in contact with the detergent bar, it can also serve as the outermost layer.
  • the wrapper is especially useful for covering individual bars of detergent bars or soaps or dish-wash bars.
  • the use of the wrappers is not limited only to detergent bars, alone, but any desired article may be wrapped therein. Wrappers are preferably rectangular or square in shape for packaging detergent bars, but it will be appreciated that it can be tailored to assume any shape and size to suit the particular article it covers.
  • the effect of corona treatment on sealing characteristics of a wrapper was studied after exposing the polymeric alkylene layer of a wrapper to corona discharge.
  • the seal integrity was determined by checking for fiber-tear, one tries to pull apart the sealed layers, which is a marker of a good seal between the layers. Sealed wrappers that do not exhibit fiber tear, when one tries to pull apart the sealed layers, have poor seal integrity.
  • the structure of the wrapper from outermost layer to innermost layer was as indicated below. 12 microns non-heat sealable PET layer (ex Garware Polyester, India) /45 gsm poster paper (ex. BILT, Ballarpur, India)/ 12 gsm 100% LDPE layer (LA17 1070 ex. IPCL, India). Surface tension of the LDPE layer of the corona treated wrapper was measured and found to be 38 dynes/cm after corona treatment (Test wrapper) , while that of the control wrapper was measured and found to be 32 dynes/cm, by the process described below.
  • the method is based on solutions that contain varying proportions of two chemicals, formamide and ethyl cellosolve each resulting solution will have a known surface tension level anywhere from 30 to 70 dynes/cm and testing stations generally have a selection of premixed and labeled solutions on hand.
  • the test involves applying the solution to the material to be tested.
  • the dyne level of the material is the same as that of the solution being applied. If the solution continues to wet the surface for longer than 2 seconds without breaking up, the dyne level of the material is higher than that of the test solution.
  • the wrapper comprises a heat-sealable PET layer
  • the layer does not seal to a LDPE layer, whose surface tension is 32 dynes/cm
  • the same wrapper when treated with corona discharge to increase the surface tension of the LDPE layer (in this case, to 38 dynes/cm) the wrapper does exhibit good sealing behavior .
  • Hot detergent bars having temperature in the range of 73 - 75 deg C and penetration value of 29 - 34 mm were wrapped (in envelope format) at a speed of 130 bars/minute in wrappers having the following structure (from outside to inside) .
  • the set seal temperature was fixed at 210 deg C 12 microns heat sealable PET layer (ex Garware Polyester, India) /45 gsm poster paper (ex. BILT, Ballarpur, India)/ 12 gsm 100% LDPE layer (LA17 1070 ex. IPCL, India) .
  • wrappers of the present invention have good sealing characteristics, while at the same time, are free from undesirable phenomenon where they stick to each other under the effect of resident heat and stack pressure.
  • Wrappers of the present invention can be made by any known method or process.
  • Paper which forms the intermediate layer, is first coated with Polyethylene glycol, a humectant. This coating is allowed to cure for 24- 48 hours. The cured paper is then laminated to a reverse printed film of PET or BOPP with the printing sandwiched in between. This laminate is cured for 24-48 hrs . This laminate is next taken to the extrusion coating line where the paper side is corona treated before extrusion with Polyethylene for getting good adhesion between the paper and the polyethylene . The polyethylene coated laminate is again corona treated on the poly side. The laminate is cured for minimum of 24 hrs before slitting and using.
  • polyethylene glycol and the coat is allowed to cure for 24- 48 hours.
  • This cured paper is next taken to the extrusion coating line where the paper corona treated before extrusion with polyethylene for getting good adhesion between the paper and the polyethylene. This is allowed to cure for approx. 24 hrs.
  • This polyethylene coated paper is then laminated to a reverse printed film of heat sealable PET or PET or BOPP with the printing sandwiched in between. This laminate is cured for 24-48 hrs.
  • the laminate is again corona treated on the polyethylene side while or before slitting rewinding.
  • the present invention provides for heat-sealable wrappers which can be used for wrapping detergent bars. It also provides for wrappers that do not stick to each other during storage and transit and are free from undesirable "bunching" problems.
  • novel wrappers hereby meet all the objects of the invention and provide a much desired solution to a long standing problem in the field of detergent bar packaging.

Landscapes

  • Laminated Bodies (AREA)

Abstract

L'invention concerne un papier d'emballage comprenant une couche de polyéthylènetéréphtalate ou de propylène orienté de façon biaxiale et une couche qui comprend un alkylène polymère, une couche intermédiaire étant placée entre ces deux couches, où la tension superficielle de ladite couche qui comprend un alkylène polymère est supérieure à 32 dynes/cm.
EP07727876A 2006-05-19 2007-04-05 Nouveaux papiers d'emballage Withdrawn EP2018268A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN762MU2006 2006-05-19
PCT/EP2007/053408 WO2007134911A1 (fr) 2006-05-19 2007-04-05 Nouveaux papiers d'emballage

Publications (1)

Publication Number Publication Date
EP2018268A1 true EP2018268A1 (fr) 2009-01-28

Family

ID=38265591

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07727876A Withdrawn EP2018268A1 (fr) 2006-05-19 2007-04-05 Nouveaux papiers d'emballage

Country Status (2)

Country Link
EP (1) EP2018268A1 (fr)
WO (1) WO2007134911A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITUD20080084A1 (it) * 2008-04-17 2009-10-18 Radici Film S P A Pellicola e procedimento ed impianto per realizzare tale pellicola
US10046395B2 (en) * 2012-10-05 2018-08-14 Conopco, Inc. Laminated film for packaging

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1315642C (zh) * 1999-02-12 2007-05-16 株式会社吴羽 包装用复合体
JP2001064419A (ja) * 1999-09-01 2001-03-13 Okura Ind Co Ltd ポリオレフィン系樹脂成形体の表面処理方法
JP2003192803A (ja) * 2001-12-28 2003-07-09 Tohcello Co Ltd 熱融着性フィルム及びその用途
KR100634288B1 (ko) * 2003-12-01 2006-10-16 야스히로 모리 고체물질의 표면 개질방법 및 표면 개질된 고체물질

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007134911A1 *

Also Published As

Publication number Publication date
WO2007134911A1 (fr) 2007-11-29

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