CA2221426A1 - Cold formable laminate films - Google Patents
Cold formable laminate films Download PDFInfo
- Publication number
- CA2221426A1 CA2221426A1 CA 2221426 CA2221426A CA2221426A1 CA 2221426 A1 CA2221426 A1 CA 2221426A1 CA 2221426 CA2221426 CA 2221426 CA 2221426 A CA2221426 A CA 2221426A CA 2221426 A1 CA2221426 A1 CA 2221426A1
- Authority
- CA
- Canada
- Prior art keywords
- film
- cold
- films
- oriented polyester
- plastic
- 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
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
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
Landscapes
- Laminated Bodies (AREA)
Abstract
Cold-formable laminate films, for example for manufacturing push-through or blister packs, or the base parts thereof containing a barrier layer, that is impermeable to water vapour and gases, and a plastic layer on both sides of the barrier layer.
The laminate exhibits a layered structure containing in series:
a) a first plastic film in the form of a stretched PVC film or an oriented polyester film and b) a metal foil, such as an aluminium foil, and c) a second plastic film in the form of a stretched PVC film, an oriented polyester film or an oriented polyamide film.
The free sides of the first and/or the second plastic film may feature a sealing layer or the first and/or the second plastic films may be sealable.
The laminate exhibits a layered structure containing in series:
a) a first plastic film in the form of a stretched PVC film or an oriented polyester film and b) a metal foil, such as an aluminium foil, and c) a second plastic film in the form of a stretched PVC film, an oriented polyester film or an oriented polyamide film.
The free sides of the first and/or the second plastic film may feature a sealing layer or the first and/or the second plastic films may be sealable.
Description
Cold Formable l.~m;n~te Films The present invention relates to cold-formable l~min~te. films containing a barrier layer that is impermeable to water vapour and gases and on both sides of the barrier layer at least one 5 plastic layer, and relates also to the use of the l~min~te films.
So called blister packs or push through packs are known. For example plastic films or plastic l~min~tes or plastic l~min~tes containing a metal foil are deepened in such a manner that a plurality of recesses or cups is produced. Shoulders are formed between the individual 10 recesses. The shoulders run completely round each recess and form a flat shoulder area. The materials prepared this way form the base part of a blister pack. The base parts may be filled with substances i.e. the contents. Known contents for blister packs are e.g. tablets, capsules, dragées etc., from the pharmaceutical field, single or if desired more than one in each recess.
After that, the base part is closed off by sealing a lidding foil such as a metal foil, usefully 15 alumi~ foil or a l~min:~tf film containing e.g. a sealing layer and a metal foil on to the shoulders of the base part by means of the sealing layer. To remove the contents, for example a tablet or capsule, the recess is pressed from the base side and the tablet or capsule pressed from within against the lid containing the metal foil above the recess. As a result of the inelasticity of the lid material, the lid m~t~ri~l tears and affords access to the contents. In 20 another version the lid m~teri~l can be peeled away under the pressure of the contents or the lid material can be grasped by a flap and peeled off.
In known blister packs which, as those described above, are manufactured out of a base part featuring recesses and a smooth lid part, it is n~cess~ry to employ relatively thick materials in 25 order to have sufficient wall thickness after deepening and, in relation to the size of the recesses, relatively broad shoulders are a pre-requisite for a blister pack that is sealed against moisture and air. As the known films exhibit only limited formability, the ratio of recess diameter to depth can not be chosen at will i.e. the walls of the recess are only moderately steep.
The object of the present invention is to propose a push-through or blister pack e.g. for capsules, tablets or powders containing active ph~rm:l~eutical ingredients or diagnostics, having a superior protective action against the uptake of moisture and gases. It should be possible thereby to keep the size of the pack small in relation to the number of recesses, for 35 example by steep walls in the recesses or as a whole by deeper forming. It should also be case 2138 possible e.g. to provide smaller shoulder areas and, at the same time still ensure safe water vapour and moisture proof sealing between the base part and the lid part.
That objective is achieved by way of the invention in that the l~min~te film exhibits the a S layered structure of the following kind and order:
a) a first plastic f~m comprised of a stretched PVC film or an oriented polyester film and b) a metal foil and c) a second plastic film in the form of a stretched PVC film, an oriented polyester film or an oriented polyamide film.
.
Preferred are cold-formable l~min~t~ films exhibiting the following sequence of layers:
a) a first plastic film comprised of a stretched PVC film b) a metal foil and c) a second plastic film in the form of an oriented polyester film or an oriented polyamide film.
20 Further preferred cold-formable l~min~te films according to the present invention are those containing the following sequence of layers:
a) a first plastic film comprised of an oriented polyester film and b) a metal foil and c) a second plastic film in the form of an oriented polyester film or an oriented polyamide film.
The first and second plastic films may - independent of each other - be a monofilm or a l:lmin~tl~ film of two or more layers of the same or different plastics. In order to influence the 30 forming behaviour and to keep the amount of material within economic limits, the first and second plastic films, which are processed to providing the present l~min~te films, are employed in practical and preferable thicknesses. For example, the stretched PVC films are 10 to 200 ~lm thick, usefully 10 to 100 ,um, preferably 30 to 60 llm thick, the oriented polyester films S to 60 llm, usefully 10 to 30 llm and preferably 12 to 25 ,um thick, the metal 35 foils 5 to 200 llm, usefully 20 to lO0 llm and preferably 45 to 60 ,um thick, and the oriented polyamide films S to 40 ,um, usefully 10 to 30 ~lm and preferably 15 to 25 ,um.
case 2138 The metal foil may be of steel, iron or copper and is preferably an ~ minillm foil. The all-mini~-m foil may usefully be an al~lminium alloy AlFeMn alloy such as AlFel.SMn, AlFeSi or AlFeSiMn, for example with a purity of 97.5 % and higher, preferably 9~.5 % and higher.
The metal foil is preferably a continuous and uninterrupted foil, which is also texture-free and 5 isotropic.
The metal foil, or the ~hlminillm foil, is either not pre-treated with a primer or is pre-treated with a primer e.g. on one or both sides.
10 Suitable primers may e.g. be of the epoxy resin type or a polyurethane.
The cold-formable l~min~t~ films contain e.g. stretched PVC films, oriented polyester films and oriented polyamide films. Suitable thermoplastics for producing these films are described below.
The PVC films are films based on halogen-containing polymers, i.e. polymers of the vinylchloride (PVC) type or vinyl plastics containing vinylchloride constituents in their structure such as copolymers of vinylchloride and vinyl-esters of aliphatic acids, copolymers of vinylchloride and esters of acrylic or methacrylic acids or acrylnitrile, copolymers of 20 vinylchloride and dein compounds and unsaturated dicarboxyl acids or their anhydrides, copolymers of vinylchloride and vinylchloride with unsaturated aldehydes, ketones etc., or polymers and copolymers of vinylidenchlorides and vinylchloride or other polymerisable compounds. The vinyl based thermoplastics may also be made soft in a known manner using primary or secondary softeners.
Films of PVC are at least monoaxially (oPVC) stretched or in some cases may be biaxially stretched. If the stretched PVC films are monoaxially stretched, their reduction in thickness is preferably in the range of 30 to 40%.
30 If the plastic films are of polyesters (PET films), then examples for the polyesters are polyalkylene-terephth~l~tes or polyalkylene-isophthalates with alkylene groups or radicals with 2 to 10 carbon atoms or alkylene groups with 2 to 10 carbon atoms which areinterrupted at least by one -O-, such as e.g. polyethylene-therphthalate, polypropylene-therephthalate, polybutyleneterephthalate (poly-tetra-methylene-terephth~l~te), poly-deca-35 methylene-terephthalate, poly-1.4.cyclo-hexyl-dimethylol-terephthalate or polyethylene-2.6-naphthalene-dicarboxylate or mixed polymers of polyalkylene-terephthalate and polyalkylene-case 2138 isophthalate whereby the fraction of isophth~l~te amounts e.g. to 1 to 10 mol %, mixed polymers and terpolymers, block polymers and grafted modifications of the above mentioned substances. Other useful polymers are known in the field by the abbreviation PEN.
5 Other polymers are copolymers of terephthalic acid and a further polycarboxyl acid with at least one glycol. Useful in that connection are the copolymers of terephthalic acid, ethylene glycol and a further glycol. Preferred are glycol-modified polyesters, known in the field as PETG.
10 Further useful polymers are polyalkylene-terephth~l~tes with alkylene groups or radicals with 2 to 10 carbon atoms and polyalkylene-terephthalates with alkylene groups or radicals with 2 to 10 carbon atoms, which are interrupted by one or two -O-. Further preferred polyesters are polyalkylene-terephthalates with alkylene groups or radicals with 2 to 4 carbon atoms.
Belonging to these polyethylene-terephth~l~tes are also A-PET, PETP and the already 15 mentioned PETG or G-PET. Very highly preferred are polyethylene-terephth~lat~ films. The films of polyester are monoaxially or preferably biaxially oriented.
If the plastic films are polyamide films (PA), then the following belong to these polyamides e.g.: polyamide 6, a homopolymer of ~-caprolactum (polycaprolac- tam); polyamide 11, 20 polyamide 12, a homopolymer of c~l~llrinl~tam (polylaurin- lactam); polyamide 6.6, a homopoly-condensate of hexamethylene-diamine and adipinic acid (polyhexamethylene-adipamide); polyamide 6.10, a homopoly-condensate of hexamethylene-diamine and sebacinic acid (polyhexamethylene-seb~c~mide); polyamide 6.12, a homopoly-condensate of hexa-methylene-diamine and dodecandic acid (polyhexamethylene- doclec~n~mide) or polyamide 25 6-3-T, a homopoly-condesate of trimethylhex~methylene-di~mine and terephthalic acid (polytrimethyl-hexamethylene-terephth~l~mide), and mixtures thereof. The films of polyamide are monoaxially or preferably biaxially oriented (oPA).
In order to control the sealing properties, the present l~min~te films may exhibit on one or 30 both free sides, sealing layers such as sealing films or organic sealing coatings e.g. based on polyolefins such as polyethylenes, polyacrylates, PVC resins, polyvinylidenchlorides, EVA
polyethylene-terephthalates, in particular the A-PET type, etc. The free sides or at least one of the free sides, especially of the oriented polyester films, may be coated with EVA
(ethylene/vinylalcohol copolymer) or with an amorphous polyester sealing layer of the PET-35 A type.
case 2138 The individual layers and in particular films i.e. the first plastic film against the metal foil and/or the second plastic film against the metal foil and any sealing films coming into contact with the free sides of the l~rnin~te film may be joined together by means of a bonding agent and/or l~min~te adhesive.
Suitable l~min~te adhesives may be solvent-cont~ining, solvent-free or aqueous acrylic adhesives or polyurethane adhesive systems. However, also adhesives that are cured under the ir~luence of radiated energy (e.g. UV; electron beams) may be employed.
10 Preferred are polyurethane based l~min;~te adhesives.
As bonding agent one may employ e.g. products based on di-isocyanate or aliphatic poly-esters.
15 The l~min~ting adhesive, like the bonding agent may be used in amounts of 0.5 to 10 g/m2 preferably 2 - 8 g/m2 and especially from 3 to 6 g/m2 . The l~min~ting adhesive may also be employed in such quantities that it forms layers that are at least 0.1 ,um thick and at most 12 ,um thick.
20 The surface of the metal foil may exhibit improved adhesion for adhesive or organic coatings or for an extrusion layer as a result of an applopriate pre-treatment (e.g. brushing, chromate treatment, ionising, ozone, corona, flame or plasma treatment). In order to promote and improve the bonding between the plastic films or extruded layers by means of organic coat-ings, bonding agents or l~min~ting adhesives, it is often useful to endow the films on the sides 25 facing the adhesive or the extrudates with adequate surface tension. The increase in surface tension may be effected preferentially by the ionising, ozone, flame or plasma treatment.
The l~min~te films according to the invention may exhibit a sealing layer, such as a sealing film or an organic sealing coating of the above mentioned substances, on one or both free 30 sides, - or on a side of the packaging container made from it and facing the contents, also known as the inner side, in some cases also on the side of the container facing out i.e. the outer side. The packaging container may be a base part of a push-through pack featuring a shoulder region and recesses therein. The sealing layer makes it possible to attach a lid to this container i.e. to the base part made of cold formed l~min~te film according to the present 35 invention. Such lids may be for example lidding foils which are sealed on at the shoulders of the packaging container. Suitable lidding foils may contain a metal foil such as an ~hlminillm case 2138 foil and plastic films and/or organic coatings may be present on one or both sides of the metal foil. An outermost layer in the form of a sealing layer may be provided at least on one side of the lidding foil. The base part and the lidding foil may be joined together via the sealing layer on the lidding foil or via the sealing layer on the base part, or via both sealing layers.
s The l~min~te films may exhibit organic coatings and/or printed patterns on the inner and/or outer sides or facing the inner and/or outer sides - in each case referring to a packaging container made from the l~min~te film according to the invention. For example, the first and/or the second film of the l~min~te may exhibit a reverse image on the side facing the 10 metal foil. A reverse image is especially suitable for transparent and translucent films. It is also possible to provide printed patterns on the outer side of the first and/or second film and, as the case requires, to cover this over with an organic coating. The outer and/or inner sides of the l~min:~te may also be provided with an organic coating; a printed pattern may also be provided on the said organic coating and/or may be applied on the packaging line.
The present invention relates also to blister packs or push-through packs or base parts for these, made from a cold formed l:~min~te film according to the present invention.
The desired blister or push-through pack and in particular the base parts for these may be 20 made from the l~min~tP film according to the invention e.g. by means of a deepening process such as stretch drawing i.e. mechanical cold forming using a shaping tool. During stretch drawing the l~min~tP film is held securely between the die and the press pad while the shaping tool forces the l~rnin~te film to adopt the desired shape by stretching it. The forming process may be performed e.g. cold or at slightly elevated temperatures of up to 50 ~C. The 25 l:lmin~tP films according to the invention, because of their behaviour during forming, may be used preferentially for blister and push-through packs with recesses having steeper sidewall regions. For example it is possible to achieve an inclination of 50 degrees of angle and higher up to almost 90 degrees of angle with respect to the horizontal surface of the l~min~te film.
The ratio of diameter to depth of an individual recess may e.g. amount to 2.5 to 3Ø The 30 push-through packs made from the l~min:lte film according to the invention may have edge lengths e.g. of 30 to 200 mm, and the shoulder regions at the edges and between the recesses may e.g. have a width of 1 to 10 mm, preferably 3 to 6 mm. Such blister packs or push-through packs may exhibit e.g. 2 to 200, usefully 6 to 60 and advantageously 10 to 30 recesses, cups or compartments to accommodate e.g. a tablet, capsule, ampoule, dragée or 35 powders. One recess is also capable of accommodating more than one single item - or instead of the above mentioned contents - e.g. small technical items. During stretch forming the case 2138 l~min:~e film is subjected purely to elongation. As a result the plastic on the packaging facing outwards, as a rule the second plastic film in the l~min~te, exhibits a high degree of work hardening during the stretching operation and a high capacity for elongation. During the elongation of the second plastic film the ~hlminillm foil is supported mechanically. Con-5 sequently, elongations can be achieved that are far beyond the limit of elongation exhibitedby ~luminium foil by itself.
The preferred biaxially stretched plastic films in the l~min~tP films according to the invention enable isotropic flow of the l~min~te film to be achieved, and with that avoid the concent-10 ration of stress. As soon as the metal foil begins to neck during the forming operation, theplastic film is able to take on the load at that site as a result of the high degree of work hard-ening experienced during shaping. During stretch drawing the material of the l~min~te film flows preferably from the width than from the thickness, R values of > 1 being advantageous.
Further, the l~min~te film exhibits a high degree of elongation at fracture. A further preferred 15 property of the l~min~e film according to the invention that can often be observed is a small degree of spring-back after forming.
The first plastic film, which in packaging made from the l~min~te film according to the invention faces the inside and the product, is harmless from the physiological standpoint and 20 may exhibit only a small or preferably no capacity for the uptake of gases and fluids. The first plastic film preferably exhibits high rigidity. A further preferred property of the plastic film is the mechanical support it affords the ~hlminillm foil during elongation. The blister packs or push-through packs made from the l~min~te film according to the invention enable a reduction of blister area of up to 10 ~o to be achieved as a result of the properties of the 25 l~min~te films and the greater degree of forming that can be achieved as a consequence thereof.
Figure 1 shows schP.m~ti~lly the structure of the l;lminA~e film 1 according to the invention.
The l~min~tP film 1 exhibits a metal foil 11 which is clad on one side by the first plastic film - 30 10 and on the other side by the second plastic film 12. The arrows 13, 14 indicate that a primer, a bonding agent and/or a l~min~ting adhesive may be provided between the individual layers. If the layers 10, 11 themselves can not be sealed or only inadequately sealed. a sealing layer in the form of an organic sealing coating or sealable film may be provided on the free side 15 of the first plastic film 10 and/or on the free side 16 of the second plastic hlm 12. As 35 a rule the second plastic film 12 forms the outside of a pack while the first plastic film 10 faces the contents of the pack.
case 2138
So called blister packs or push through packs are known. For example plastic films or plastic l~min~tes or plastic l~min~tes containing a metal foil are deepened in such a manner that a plurality of recesses or cups is produced. Shoulders are formed between the individual 10 recesses. The shoulders run completely round each recess and form a flat shoulder area. The materials prepared this way form the base part of a blister pack. The base parts may be filled with substances i.e. the contents. Known contents for blister packs are e.g. tablets, capsules, dragées etc., from the pharmaceutical field, single or if desired more than one in each recess.
After that, the base part is closed off by sealing a lidding foil such as a metal foil, usefully 15 alumi~ foil or a l~min:~tf film containing e.g. a sealing layer and a metal foil on to the shoulders of the base part by means of the sealing layer. To remove the contents, for example a tablet or capsule, the recess is pressed from the base side and the tablet or capsule pressed from within against the lid containing the metal foil above the recess. As a result of the inelasticity of the lid material, the lid m~t~ri~l tears and affords access to the contents. In 20 another version the lid m~teri~l can be peeled away under the pressure of the contents or the lid material can be grasped by a flap and peeled off.
In known blister packs which, as those described above, are manufactured out of a base part featuring recesses and a smooth lid part, it is n~cess~ry to employ relatively thick materials in 25 order to have sufficient wall thickness after deepening and, in relation to the size of the recesses, relatively broad shoulders are a pre-requisite for a blister pack that is sealed against moisture and air. As the known films exhibit only limited formability, the ratio of recess diameter to depth can not be chosen at will i.e. the walls of the recess are only moderately steep.
The object of the present invention is to propose a push-through or blister pack e.g. for capsules, tablets or powders containing active ph~rm:l~eutical ingredients or diagnostics, having a superior protective action against the uptake of moisture and gases. It should be possible thereby to keep the size of the pack small in relation to the number of recesses, for 35 example by steep walls in the recesses or as a whole by deeper forming. It should also be case 2138 possible e.g. to provide smaller shoulder areas and, at the same time still ensure safe water vapour and moisture proof sealing between the base part and the lid part.
That objective is achieved by way of the invention in that the l~min~te film exhibits the a S layered structure of the following kind and order:
a) a first plastic f~m comprised of a stretched PVC film or an oriented polyester film and b) a metal foil and c) a second plastic film in the form of a stretched PVC film, an oriented polyester film or an oriented polyamide film.
.
Preferred are cold-formable l~min~t~ films exhibiting the following sequence of layers:
a) a first plastic film comprised of a stretched PVC film b) a metal foil and c) a second plastic film in the form of an oriented polyester film or an oriented polyamide film.
20 Further preferred cold-formable l~min~te films according to the present invention are those containing the following sequence of layers:
a) a first plastic film comprised of an oriented polyester film and b) a metal foil and c) a second plastic film in the form of an oriented polyester film or an oriented polyamide film.
The first and second plastic films may - independent of each other - be a monofilm or a l:lmin~tl~ film of two or more layers of the same or different plastics. In order to influence the 30 forming behaviour and to keep the amount of material within economic limits, the first and second plastic films, which are processed to providing the present l~min~te films, are employed in practical and preferable thicknesses. For example, the stretched PVC films are 10 to 200 ~lm thick, usefully 10 to 100 ,um, preferably 30 to 60 llm thick, the oriented polyester films S to 60 llm, usefully 10 to 30 llm and preferably 12 to 25 ,um thick, the metal 35 foils 5 to 200 llm, usefully 20 to lO0 llm and preferably 45 to 60 ,um thick, and the oriented polyamide films S to 40 ,um, usefully 10 to 30 ~lm and preferably 15 to 25 ,um.
case 2138 The metal foil may be of steel, iron or copper and is preferably an ~ minillm foil. The all-mini~-m foil may usefully be an al~lminium alloy AlFeMn alloy such as AlFel.SMn, AlFeSi or AlFeSiMn, for example with a purity of 97.5 % and higher, preferably 9~.5 % and higher.
The metal foil is preferably a continuous and uninterrupted foil, which is also texture-free and 5 isotropic.
The metal foil, or the ~hlminillm foil, is either not pre-treated with a primer or is pre-treated with a primer e.g. on one or both sides.
10 Suitable primers may e.g. be of the epoxy resin type or a polyurethane.
The cold-formable l~min~t~ films contain e.g. stretched PVC films, oriented polyester films and oriented polyamide films. Suitable thermoplastics for producing these films are described below.
The PVC films are films based on halogen-containing polymers, i.e. polymers of the vinylchloride (PVC) type or vinyl plastics containing vinylchloride constituents in their structure such as copolymers of vinylchloride and vinyl-esters of aliphatic acids, copolymers of vinylchloride and esters of acrylic or methacrylic acids or acrylnitrile, copolymers of 20 vinylchloride and dein compounds and unsaturated dicarboxyl acids or their anhydrides, copolymers of vinylchloride and vinylchloride with unsaturated aldehydes, ketones etc., or polymers and copolymers of vinylidenchlorides and vinylchloride or other polymerisable compounds. The vinyl based thermoplastics may also be made soft in a known manner using primary or secondary softeners.
Films of PVC are at least monoaxially (oPVC) stretched or in some cases may be biaxially stretched. If the stretched PVC films are monoaxially stretched, their reduction in thickness is preferably in the range of 30 to 40%.
30 If the plastic films are of polyesters (PET films), then examples for the polyesters are polyalkylene-terephth~l~tes or polyalkylene-isophthalates with alkylene groups or radicals with 2 to 10 carbon atoms or alkylene groups with 2 to 10 carbon atoms which areinterrupted at least by one -O-, such as e.g. polyethylene-therphthalate, polypropylene-therephthalate, polybutyleneterephthalate (poly-tetra-methylene-terephth~l~te), poly-deca-35 methylene-terephthalate, poly-1.4.cyclo-hexyl-dimethylol-terephthalate or polyethylene-2.6-naphthalene-dicarboxylate or mixed polymers of polyalkylene-terephthalate and polyalkylene-case 2138 isophthalate whereby the fraction of isophth~l~te amounts e.g. to 1 to 10 mol %, mixed polymers and terpolymers, block polymers and grafted modifications of the above mentioned substances. Other useful polymers are known in the field by the abbreviation PEN.
5 Other polymers are copolymers of terephthalic acid and a further polycarboxyl acid with at least one glycol. Useful in that connection are the copolymers of terephthalic acid, ethylene glycol and a further glycol. Preferred are glycol-modified polyesters, known in the field as PETG.
10 Further useful polymers are polyalkylene-terephth~l~tes with alkylene groups or radicals with 2 to 10 carbon atoms and polyalkylene-terephthalates with alkylene groups or radicals with 2 to 10 carbon atoms, which are interrupted by one or two -O-. Further preferred polyesters are polyalkylene-terephthalates with alkylene groups or radicals with 2 to 4 carbon atoms.
Belonging to these polyethylene-terephth~l~tes are also A-PET, PETP and the already 15 mentioned PETG or G-PET. Very highly preferred are polyethylene-terephth~lat~ films. The films of polyester are monoaxially or preferably biaxially oriented.
If the plastic films are polyamide films (PA), then the following belong to these polyamides e.g.: polyamide 6, a homopolymer of ~-caprolactum (polycaprolac- tam); polyamide 11, 20 polyamide 12, a homopolymer of c~l~llrinl~tam (polylaurin- lactam); polyamide 6.6, a homopoly-condensate of hexamethylene-diamine and adipinic acid (polyhexamethylene-adipamide); polyamide 6.10, a homopoly-condensate of hexamethylene-diamine and sebacinic acid (polyhexamethylene-seb~c~mide); polyamide 6.12, a homopoly-condensate of hexa-methylene-diamine and dodecandic acid (polyhexamethylene- doclec~n~mide) or polyamide 25 6-3-T, a homopoly-condesate of trimethylhex~methylene-di~mine and terephthalic acid (polytrimethyl-hexamethylene-terephth~l~mide), and mixtures thereof. The films of polyamide are monoaxially or preferably biaxially oriented (oPA).
In order to control the sealing properties, the present l~min~te films may exhibit on one or 30 both free sides, sealing layers such as sealing films or organic sealing coatings e.g. based on polyolefins such as polyethylenes, polyacrylates, PVC resins, polyvinylidenchlorides, EVA
polyethylene-terephthalates, in particular the A-PET type, etc. The free sides or at least one of the free sides, especially of the oriented polyester films, may be coated with EVA
(ethylene/vinylalcohol copolymer) or with an amorphous polyester sealing layer of the PET-35 A type.
case 2138 The individual layers and in particular films i.e. the first plastic film against the metal foil and/or the second plastic film against the metal foil and any sealing films coming into contact with the free sides of the l~rnin~te film may be joined together by means of a bonding agent and/or l~min~te adhesive.
Suitable l~min~te adhesives may be solvent-cont~ining, solvent-free or aqueous acrylic adhesives or polyurethane adhesive systems. However, also adhesives that are cured under the ir~luence of radiated energy (e.g. UV; electron beams) may be employed.
10 Preferred are polyurethane based l~min;~te adhesives.
As bonding agent one may employ e.g. products based on di-isocyanate or aliphatic poly-esters.
15 The l~min~ting adhesive, like the bonding agent may be used in amounts of 0.5 to 10 g/m2 preferably 2 - 8 g/m2 and especially from 3 to 6 g/m2 . The l~min~ting adhesive may also be employed in such quantities that it forms layers that are at least 0.1 ,um thick and at most 12 ,um thick.
20 The surface of the metal foil may exhibit improved adhesion for adhesive or organic coatings or for an extrusion layer as a result of an applopriate pre-treatment (e.g. brushing, chromate treatment, ionising, ozone, corona, flame or plasma treatment). In order to promote and improve the bonding between the plastic films or extruded layers by means of organic coat-ings, bonding agents or l~min~ting adhesives, it is often useful to endow the films on the sides 25 facing the adhesive or the extrudates with adequate surface tension. The increase in surface tension may be effected preferentially by the ionising, ozone, flame or plasma treatment.
The l~min~te films according to the invention may exhibit a sealing layer, such as a sealing film or an organic sealing coating of the above mentioned substances, on one or both free 30 sides, - or on a side of the packaging container made from it and facing the contents, also known as the inner side, in some cases also on the side of the container facing out i.e. the outer side. The packaging container may be a base part of a push-through pack featuring a shoulder region and recesses therein. The sealing layer makes it possible to attach a lid to this container i.e. to the base part made of cold formed l~min~te film according to the present 35 invention. Such lids may be for example lidding foils which are sealed on at the shoulders of the packaging container. Suitable lidding foils may contain a metal foil such as an ~hlminillm case 2138 foil and plastic films and/or organic coatings may be present on one or both sides of the metal foil. An outermost layer in the form of a sealing layer may be provided at least on one side of the lidding foil. The base part and the lidding foil may be joined together via the sealing layer on the lidding foil or via the sealing layer on the base part, or via both sealing layers.
s The l~min~te films may exhibit organic coatings and/or printed patterns on the inner and/or outer sides or facing the inner and/or outer sides - in each case referring to a packaging container made from the l~min~te film according to the invention. For example, the first and/or the second film of the l~min~te may exhibit a reverse image on the side facing the 10 metal foil. A reverse image is especially suitable for transparent and translucent films. It is also possible to provide printed patterns on the outer side of the first and/or second film and, as the case requires, to cover this over with an organic coating. The outer and/or inner sides of the l~min:~te may also be provided with an organic coating; a printed pattern may also be provided on the said organic coating and/or may be applied on the packaging line.
The present invention relates also to blister packs or push-through packs or base parts for these, made from a cold formed l:~min~te film according to the present invention.
The desired blister or push-through pack and in particular the base parts for these may be 20 made from the l~min~tP film according to the invention e.g. by means of a deepening process such as stretch drawing i.e. mechanical cold forming using a shaping tool. During stretch drawing the l~min~tP film is held securely between the die and the press pad while the shaping tool forces the l~rnin~te film to adopt the desired shape by stretching it. The forming process may be performed e.g. cold or at slightly elevated temperatures of up to 50 ~C. The 25 l:lmin~tP films according to the invention, because of their behaviour during forming, may be used preferentially for blister and push-through packs with recesses having steeper sidewall regions. For example it is possible to achieve an inclination of 50 degrees of angle and higher up to almost 90 degrees of angle with respect to the horizontal surface of the l~min~te film.
The ratio of diameter to depth of an individual recess may e.g. amount to 2.5 to 3Ø The 30 push-through packs made from the l~min:lte film according to the invention may have edge lengths e.g. of 30 to 200 mm, and the shoulder regions at the edges and between the recesses may e.g. have a width of 1 to 10 mm, preferably 3 to 6 mm. Such blister packs or push-through packs may exhibit e.g. 2 to 200, usefully 6 to 60 and advantageously 10 to 30 recesses, cups or compartments to accommodate e.g. a tablet, capsule, ampoule, dragée or 35 powders. One recess is also capable of accommodating more than one single item - or instead of the above mentioned contents - e.g. small technical items. During stretch forming the case 2138 l~min:~e film is subjected purely to elongation. As a result the plastic on the packaging facing outwards, as a rule the second plastic film in the l~min~te, exhibits a high degree of work hardening during the stretching operation and a high capacity for elongation. During the elongation of the second plastic film the ~hlminillm foil is supported mechanically. Con-5 sequently, elongations can be achieved that are far beyond the limit of elongation exhibitedby ~luminium foil by itself.
The preferred biaxially stretched plastic films in the l~min~tP films according to the invention enable isotropic flow of the l~min~te film to be achieved, and with that avoid the concent-10 ration of stress. As soon as the metal foil begins to neck during the forming operation, theplastic film is able to take on the load at that site as a result of the high degree of work hard-ening experienced during shaping. During stretch drawing the material of the l~min~te film flows preferably from the width than from the thickness, R values of > 1 being advantageous.
Further, the l~min~te film exhibits a high degree of elongation at fracture. A further preferred 15 property of the l~min~e film according to the invention that can often be observed is a small degree of spring-back after forming.
The first plastic film, which in packaging made from the l~min~te film according to the invention faces the inside and the product, is harmless from the physiological standpoint and 20 may exhibit only a small or preferably no capacity for the uptake of gases and fluids. The first plastic film preferably exhibits high rigidity. A further preferred property of the plastic film is the mechanical support it affords the ~hlminillm foil during elongation. The blister packs or push-through packs made from the l~min~te film according to the invention enable a reduction of blister area of up to 10 ~o to be achieved as a result of the properties of the 25 l~min~te films and the greater degree of forming that can be achieved as a consequence thereof.
Figure 1 shows schP.m~ti~lly the structure of the l;lminA~e film 1 according to the invention.
The l~min~tP film 1 exhibits a metal foil 11 which is clad on one side by the first plastic film - 30 10 and on the other side by the second plastic film 12. The arrows 13, 14 indicate that a primer, a bonding agent and/or a l~min~ting adhesive may be provided between the individual layers. If the layers 10, 11 themselves can not be sealed or only inadequately sealed. a sealing layer in the form of an organic sealing coating or sealable film may be provided on the free side 15 of the first plastic film 10 and/or on the free side 16 of the second plastic hlm 12. As 35 a rule the second plastic film 12 forms the outside of a pack while the first plastic film 10 faces the contents of the pack.
case 2138
Claims (12)
1. Cold-formable laminate films containing a barrier layer that is impermeable to water vapour and gases and on both sides of the barrier layer at least one plastic layer, characterised in that, the laminate film exhibits a layered structure containing in the following order:
a) a first plastic film comprised of a stretched PVC film or an oriented polyester film and b) a metal foil and c) a second plastic film in the form of a stretched PVC film, an oriented polyester film or an oriented polyamide film.
a) a first plastic film comprised of a stretched PVC film or an oriented polyester film and b) a metal foil and c) a second plastic film in the form of a stretched PVC film, an oriented polyester film or an oriented polyamide film.
2. Cold-formable laminate films according to claim 1, characterised in that the laminate film exhibits a layered structure containing in the following order:
a) a first plastic film comprised of a stretched PVC film b) a metal foil and c) a second plastic film in the form of an oriented polyester film or an oriented polyamide film.
a) a first plastic film comprised of a stretched PVC film b) a metal foil and c) a second plastic film in the form of an oriented polyester film or an oriented polyamide film.
3. Cold-formable laminate films according to claim 1, characterised in that the laminate film exhibits a layered structure containing in the following order:
a) a first plastic film comprised of an oriented polyester film and b) a metal foil and c) a second plastic film in the form of an oriented polyester film or an oriented polyamide film.
a) a first plastic film comprised of an oriented polyester film and b) a metal foil and c) a second plastic film in the form of an oriented polyester film or an oriented polyamide film.
4. Cold-formable laminate films according to claims 1 to 3, characterised in that the oriented polyester film of layer a) or c) or a) and c) are of a sealable polyethylene-terephthalate, in particular of the A-PET type, or that the oriented polyester film of layer a) or c) or a) and c) bear a sealing layer on the free side
5. Cold-formable laminate films according to claim 4, characterised in that the free sides or at least one of the free sides of the oriented polyester films are coated with EVA
(ethylene/vinylalcohol copolymer) or with an amorphous polyester - sealing layer(A-PET.
(ethylene/vinylalcohol copolymer) or with an amorphous polyester - sealing layer(A-PET.
6. Cold-formable laminate films according to claim 1, characterised in that the stretched PVC films exhibit a thickness of 10 to 200 µm, preferably 10 to 100 µm, that the oriented polyester films exhibit a thickness of 5 to 60 µm, preferably 10 to 30 µm, that the metal foil exhibits a thickness of 5 to 200 µm, preferably 20 to 100 µm, and that the oriented polyamide films exhibit a thickness of 5 to 40 µm, preferably 12 to 30 µm.
7. Cold-formable laminate films according to claim 1, characterised in that the metal foil is an aluminium foil, usefully a foil of an aluminium alloy of the AlFeMn, AlFeSi or AlFeSiMn type, preferably having a purity of 97.5 % and higher and in particular a purity of 98.5 % and higher.
8 Cold-formable laminate films according to claim 1, characterised in that the metal foil is pre-treated with a primer on one or both sides.
9. Cold-formable laminate films according to claim 1, characterised in that the oriented polyester films and the oriented polyamide films are biaxially stretched.
10. Cold-formable laminate films according to claim 1, characterised in that the stretched PVC films are stretched monoaxially, preferably with a 30 to 40 % reduction in thickness.
11. Cold-formable laminate films according to claim 1, characterised in that a bonding agent and/or a laminating adhesive is provided between the individual layers.
12. Base parts of blister packs or push-through packs made from the laminate film according to claim 1.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP96810833.2 | 1996-11-29 | ||
| EP96810833A EP0845350A1 (en) | 1996-11-29 | 1996-11-29 | Cold formable laminated film |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2221426A1 true CA2221426A1 (en) | 1998-05-29 |
Family
ID=8225760
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2221426 Abandoned CA2221426A1 (en) | 1996-11-29 | 1997-11-13 | Cold formable laminate films |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0845350A1 (en) |
| CA (1) | CA2221426A1 (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6355355B1 (en) | 1998-06-26 | 2002-03-12 | Konica Corporation | Packaging materials for electrophotographic development materials, a packaging method, and toner and developer material for electrophotographic development |
| JP2006527667A (en) * | 2003-06-17 | 2006-12-07 | アルカン テヒノロギー ウント メーニッジメント リミテッド | Laminates that can be cold worked |
| WO2007072494A1 (en) * | 2005-12-23 | 2007-06-28 | Naik Praful Ramchandra | Metallized packaging blister container |
| CN102975428A (en) * | 2012-12-24 | 2013-03-20 | 苏州海顺包装材料有限公司 | Medicinal compound rigid sheet for cold stamping forming |
| US9492377B2 (en) | 2011-01-28 | 2016-11-15 | Probiotical S.P.A. | Effervescent composition in solid form for use in vaginal applications for the treatment of vaginal infections |
| US9925224B2 (en) | 2011-05-09 | 2018-03-27 | Probiotical S.P.A. | Bacterial strains belonging to the genus bifidobacterium for use in the treatment of hypercholesterolaemia |
| US10028982B2 (en) | 2011-09-09 | 2018-07-24 | Probiotical North America Inc. | Composition comprising N-acetylcysteine and/or microencapsulated gastroprotected lysozyme in association with probiotic bacteria capable of restoring the stomach's own barrier effect which is lost during the pharmacological treatment of gastric hyperacidity |
| US10286017B2 (en) | 2011-05-09 | 2019-05-14 | Probiotical S.P.A. | Probiotic bacterial strains and symbiotic composition containing the same intended for infant food |
| US10384847B2 (en) | 2011-09-23 | 2019-08-20 | Probiotical North America Inc. | Material impermeable to humidity and oxygen for packaging dietary products, cosmetics and medicinal specialities |
| US10982184B2 (en) | 2011-05-09 | 2021-04-20 | Probiotical S.P.A. | Bacterial strains capable of metabolizing oxalates |
| US11110136B2 (en) | 2013-05-14 | 2021-09-07 | Probiotical S.P.A. | Composition comprising lactic acid bacteria for use in the preventive and/or curative treatment of recurrent cystitis |
| US20230078293A1 (en) * | 2020-02-17 | 2023-03-16 | Toyobo Co., Ltd. | Crystalline polyester resin and adhesive composition using the same |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6270869B1 (en) * | 1998-12-02 | 2001-08-07 | Alusuisse Technology & Management Ltd. | Cold formable laminate films |
| EP1010519A1 (en) * | 1998-12-16 | 2000-06-21 | Alusuisse Technology & Management AG | Sterilizable laminated sheet |
| GB2359044B (en) * | 1999-12-22 | 2003-11-19 | Rexam Med Packaging Ltd | Laminates |
| DE10235584A1 (en) * | 2002-08-03 | 2004-02-19 | Alcan Deutschland Holdings Gmbh & Co. Kg | Sterilizable sealing foil comprises an extruded barrier layer which is located between a primer layer and a functional layer, and prevents migration of constituents of a container filler material |
| GB0225621D0 (en) * | 2002-11-02 | 2002-12-11 | Glaxo Group Ltd | Medicament carrier |
| US20060040076A1 (en) * | 2004-08-18 | 2006-02-23 | Franzyshen Stephen K | Formable film for cold-form, blister-type pharmaceutical packaging |
| EP1655130A1 (en) * | 2004-11-08 | 2006-05-10 | Alcan Technology & Management Ltd. | Colddrawable laminate |
| DE102007010113A1 (en) | 2007-02-28 | 2008-09-04 | Hydro Aluminium Deutschland Gmbh | Composite film for filling material containers, comprises first- and second plastic layer, aluminum film arranged between the plastic layers, and first and second primer layer arranged between the plastic layers and the aluminum film |
| DE102008023952A1 (en) * | 2008-05-16 | 2009-12-03 | Alcan Technology & Management Ag | Packaging cover film, container, packaging and packaging product unit |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2316513C2 (en) * | 1973-04-03 | 1982-02-25 | Robert Bosch Gmbh, 7000 Stuttgart | Lightweight packaging container made of multilayer composite film material |
| DE2757370A1 (en) * | 1977-12-22 | 1979-07-05 | Bayer Ag | GAS-TIGHT PLASTIC-ALUMINUM COMPOSITE FILMS |
| SE446703B (en) * | 1982-01-20 | 1986-10-06 | Tetra Pak Finance & Trading | SET TO MAKE A DEPTH OR DRAWING LEMPAT LAMINATE MATERIAL, THROUGH THE SET LAMINATE MANUFACTURED AND ARTICLES MANUFACTURED |
| DE59003859D1 (en) * | 1989-08-23 | 1994-01-27 | Alusuisse Lonza Services Ag | Sterilizable packaging container made of plastic-metal-plastic composite material and process for its production. |
| GB2242159B (en) * | 1990-03-19 | 1994-02-02 | Toyo Kohan Co Ltd | Copolyester resin film-metal sheet laminates |
| JP2500556B2 (en) * | 1991-11-27 | 1996-05-29 | 東洋製罐株式会社 | Laminated squeezing container with excellent impact resistance and its manufacturing method |
| US5343672A (en) * | 1992-12-01 | 1994-09-06 | Scherer Ltd R P | Method for manufacturing freeze dried dosages in a multilaminate blister pack |
| CH684746A5 (en) * | 1993-02-25 | 1994-12-15 | Alusuisse Lonza Services Ag | Laminate. |
| IL110098A (en) * | 1993-08-13 | 1998-02-08 | Johnson & Johnson Vision Prod | Method of double-sided printing of a laminate and product obtained thereby |
-
1996
- 1996-11-29 EP EP96810833A patent/EP0845350A1/en not_active Withdrawn
-
1997
- 1997-11-13 CA CA 2221426 patent/CA2221426A1/en not_active Abandoned
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6355355B1 (en) | 1998-06-26 | 2002-03-12 | Konica Corporation | Packaging materials for electrophotographic development materials, a packaging method, and toner and developer material for electrophotographic development |
| JP2006527667A (en) * | 2003-06-17 | 2006-12-07 | アルカン テヒノロギー ウント メーニッジメント リミテッド | Laminates that can be cold worked |
| WO2007072494A1 (en) * | 2005-12-23 | 2007-06-28 | Naik Praful Ramchandra | Metallized packaging blister container |
| US9492377B2 (en) | 2011-01-28 | 2016-11-15 | Probiotical S.P.A. | Effervescent composition in solid form for use in vaginal applications for the treatment of vaginal infections |
| US10286017B2 (en) | 2011-05-09 | 2019-05-14 | Probiotical S.P.A. | Probiotic bacterial strains and symbiotic composition containing the same intended for infant food |
| US10982184B2 (en) | 2011-05-09 | 2021-04-20 | Probiotical S.P.A. | Bacterial strains capable of metabolizing oxalates |
| US9925224B2 (en) | 2011-05-09 | 2018-03-27 | Probiotical S.P.A. | Bacterial strains belonging to the genus bifidobacterium for use in the treatment of hypercholesterolaemia |
| US10028982B2 (en) | 2011-09-09 | 2018-07-24 | Probiotical North America Inc. | Composition comprising N-acetylcysteine and/or microencapsulated gastroprotected lysozyme in association with probiotic bacteria capable of restoring the stomach's own barrier effect which is lost during the pharmacological treatment of gastric hyperacidity |
| US10384847B2 (en) | 2011-09-23 | 2019-08-20 | Probiotical North America Inc. | Material impermeable to humidity and oxygen for packaging dietary products, cosmetics and medicinal specialities |
| CN102975428B (en) * | 2012-12-24 | 2015-12-23 | 苏州海顺包装材料有限公司 | A kind of cold stamping shaped medicinal composite hard sheet |
| CN102975428A (en) * | 2012-12-24 | 2013-03-20 | 苏州海顺包装材料有限公司 | Medicinal compound rigid sheet for cold stamping forming |
| US11110136B2 (en) | 2013-05-14 | 2021-09-07 | Probiotical S.P.A. | Composition comprising lactic acid bacteria for use in the preventive and/or curative treatment of recurrent cystitis |
| US20230078293A1 (en) * | 2020-02-17 | 2023-03-16 | Toyobo Co., Ltd. | Crystalline polyester resin and adhesive composition using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0845350A1 (en) | 1998-06-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6270869B1 (en) | Cold formable laminate films | |
| CA2221426A1 (en) | Cold formable laminate films | |
| CA2133645C (en) | Composite material | |
| CA2237996C (en) | Packaging container | |
| US8383221B2 (en) | Multi-layer film | |
| US20010031348A1 (en) | Sterilisible composite film | |
| US20060283758A1 (en) | Blister pack | |
| US20070190277A1 (en) | Sterilisible Composite Film | |
| US4772348A (en) | Method of making a gas barrier laminate | |
| EP3019415A1 (en) | Gas and light proof, double-shell blister packs for medicinal contents | |
| WO2009105858A1 (en) | Extrusion-coated lidding foil for push-through blister packaging | |
| KR20120089474A (en) | Thermofomable multilayer films and blister packs produced therefrom | |
| US20170137159A1 (en) | Deep Draw Container Forming Method and Nutritional Product Containers | |
| EP2801475A1 (en) | Novel blister pack for pharmaceuticals | |
| US5968663A (en) | Stretch-formable laminate | |
| US20200346446A1 (en) | Packaging film for high temperature materials | |
| PL1617995T3 (en) | Covering foil for blister packs | |
| JP5804339B2 (en) | Anti-fogging multilayer film, laminate using the same, and packaging material | |
| JP2013111822A (en) | Multilayer film and package | |
| JP2007136914A (en) | Multilayered film and package comprising the same | |
| JP3983131B2 (en) | Package | |
| JP2015024593A (en) | Multilayer film and package | |
| JP2020006654A (en) | Multilayer film and package formed of the same | |
| TWI770360B (en) | Laminates, shaped containers, and packages for shaped containers | |
| IE912895A1 (en) | Stretch-formable laminate |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |