Film for wrapping items

 

The invention relates to the field of packaging food products such as sweets, chocolate, candy, sugar or caramel, chewing gum, candy. The set is a solid body and its packaging in the form of a wrapper or package. Packaging represents a film having three layers, of which two layers comprising at least 20 wt.%, this is a complex polyester obtained by the condensation of terephthalic acid with ethylene glycol and diola having at least three carbon atoms, and one of the layers contains at least one polyolefin and is in the middle. This film contains antibioticuse agent and/or a slip agent. Furthermore, it describes a method of producing a film, comprising the step of coextrusion and subsequent blowing of different thermoplastic compositions, which are different layers of the film, followed by at least stage monoaxial stretching or biaxial stretching. The invention allows to pack a solid body without the aid of glue or adhesive tape, improving the safety of packaging around the subject. 3 C. and 22 C.p. f-crystals, 2 tab., 2 Il.

The invention relates to a kit consisting of a rigid body and its packaging; vysheukazannoe contains at least one layer, containing at least one complex of the polyester. The invention relates to the field of packaging food products, such as sweets, such as chocolate, sweets, boiled sugar or caramel, chewing gum, lollipops, but also to the field of packaging of any other solid object, like a soap, portioned cheeses, dosed culinary additives, such as bouillon cubes.

In Fig.1 and 2 as an example sweets after wrapping according to the present invention.

Packaging, referred to in this application may, therefore, be a film adjacent to the most part and even almost completely to the surface of the Packed solid, and the solid body is typically formed from a single element, as, for example, in the case of candy (as opposed to, for example, powder formed of several elements in the form of particles). Of course, that in the framework of the present invention, the kit can contain: - solid body, solid body, wrapped first film or paper, if necessary with a metal coating; solid - wrapped with a film containing at least a layer of the wrapper and/or package containing the nicks candy can be wrapped with films of polyvinyl chloride (PVC) or of cellophane. PVC is generally on the way to substitution and, in addition, is a high density to such an extent that it greatly aggravates the party Packed sweets. Cellophane is made the hard way, making it expensive, and manufacturers are becoming less numerous. Thus, there is a need to substitute products of these two materials, and, in particular, in the field of films for wrapping solid objects, such as candy.

In particular, the film should be suitable for driving, i.e., it must retain the form that it was given during wrapping, with the smallest possible tendency to return to its initial form, that is, to the flat film. This property allows you to avoid needing the help of adhesive tape or glue, for example, at the zone level, most adjacent to the wrap, that is, between the solid pack body and the wrap to hold Upakovka the form that it was given.

This tendency of the film not to retain the shape given to it, the form that she was trying to give, is particularly difficult to overcome when you want to wrap and pack solid in one or more wrappers for candy, presents on Causey, at least one wrapper and/or one package, watching, does wrap a tendency to return to original shape after it has been formed. This test can be carried out by education wrappers in half turn, i.e., performing a part of the film, not compressive solid, 1/2 turn towards zavertyaeva solid.

Film for wrapping solids should also give the ability to easily manipulate a mechanism for wrapping the above items, which are waiting for the highest possible speeds, for example, from 50 to 1500 zavertyvanii items per minute through the mechanism.

The film should also be easily cut. Indeed, before the driving of the object you want to cut the surface of the film, useful for wrapping the above object, usually starting with a roll of the above film. Film to the wrapping of the subject, before and after mechanical cutting must remain highly flat and should not show a tendency to slowerthan. Indeed, this trend could break the chain of manufacture and cause it to stop.

In addition, depending on the case, the film should predstavitelnee organoleptic properties.

If necessary, the film should have good ability to embossing and/or metallization. In addition, the film should be easy to manufacture, since its basic materials.

MONOFILM of reorientating high density polyethylene or from reorientating polypropylene does not respond satisfactorily to the technical requirements of such applications, in particular its ability to driving small. In addition, these materials are extruded by extrusion with subsequent blown, usually referred to by way of a "bubble", are mediocre optical properties due to the presence of surface nodules involving the diffraction of light.

From EP 0265544 known set containing the solid body and the packing with film in the form of at least one wrapper and/or package with layers, two of which contain complex polyester, and one of the layers contains a butadiene-styrene copolymer and is in the middle.

Also from this publication known film containing layers, two of which contain complex polyester, and one of the layers contains a butadiene-styrene copolymer and is in the middle.

In addition, this publication a method of obtaining Ammoudara level of technology.

The film according to the invention gives the answer to the above problem. In particular, the film according to the invention allows to pack a solid body through a package containing at least the wrapper and/or the service, except that would be necessary to resort to using tape or glue. In particular, it is not necessary that the film itself was the glue that would be somewhat acceptable if the film itself was bonded at a high temperature in order to maintain a relatively closed packaging. Thus, the film according to the invention ensures the implementation of the undamaged sealed packaging around the subject by simply executing at least wrappers (also called "torronnage" "corona") and/or at least package, without having to become inevitably necessary to resort to sealing at low or high temperature in any place packing after wrapping of the subject. To complete this package all the more not need to be attached on the film, and therefore, beyond the thickness of the above film special fastening means, such as flexible rods made of metal so that the X.

The film used in the present invention contains at least one layer containing at least one complex of the polyester. Thus, it can be essentially a single-layer or multilayer film. This film usually has a thickness of from 5 to 100 microns, and often from 10 to 60 μm.

The film is essentially a single layer, if its production requires the extrusion of only a single thermoplastic material, even if, if necessary, later, to the above-mentioned extrusion been added to the usual layers of finishing processing, such as the metallization layer and/or embossing and/or impregnated with an anti-static agent.

The film is called multilayer in the framework of this application, if it contains at least two layers of different thermoplastic materials.

Mostly the film contains a plane of symmetry which is parallel to it; the above symmetry refers simultaneously to the geometry and composition of the film. This implies that if the film is multilayered and contains at least two layers of different composition, the film certainly contains at least three layers.

The total weight of the layer containing a complex of the polyester, can make mensis which one, formed from a composition that is different from the other two, is in the middle of the film, thus it includes the symmetry plane of the film. Under the "three main layers" means that the total weight of these three layers is at least 80% by weight of the total film, and that each of these three layers, obtained from a thermoplastic material which is at least 10% by weight of the total weight of the film.

For the case with a film containing at least three main layers in the meaning defined above, the middle layer may contain at least one polyolefin, and the other two layers are essentially identical, can contain at least one complex polyester.

Film containing at least three main layers in the meaning defined above, demonstrates excellent ability to divide (the gap is essentially linear in all directions, in particular, at the same time in the direction of extrusion and in the direction perpendicular to the extrusion. Thus, this film is also suitable in particular for applications where you need a good breaking ability in the direction perpendicular to the extrusion.

In the set according to the present invention, when made mention of "the aqueous material.

According to one variant of the invention, the film comprises at least one complex of the polyester and at least one layer contains at least one polyolefin.

Mostly film according to the invention contains at least one layer of polyester, and the film can be, essentially, a single-layer or multi-layered and contain in this case, at least one layer containing at least one layer containing at least one polyolefin.

Under the polyolefin refers to a polymer of at least olefins. The term "polymer" should be understood in a broad sense so that it includes the concept of homopolymer, copolymer, terpolymer, interpolymer or mixture of polymers. As the olefin can lead to ethylene, propylene, butylene, hexylen, 1-octile. As the polyolefin prefer a polymer of propylene or ethylene, the latter is more preferred. The polymer of at least olefins can be obtained by polymerization of at least the olefin with at least another monomer, which may be an olefin or other monomer, such as vinyl acetate, maleic anhydride or an ester of acrylic acid.

For the case with Plateliai, basically, the polymer of ethylene. This polymer of ethylene may be such that at least 80% of the monomer units that form it, will be ethylene.

Under the complex polyester refers to a polymer containing at least one ester group in the form of a duplicate link in the polymer chain; the term "polymer" includes here also the concept of homopolymer, copolymer, terpolymer, interpolymers and mixtures of polymers.

Complex polyester can be obtained by condensation of terephthalic acid and at least one diol.

Complex polyester can be selected from among amorphous or semi-crystalline polyesters. Under the amorphous means that the complex polyester is less than 15% crystallinity and preferably less than 10% crystallinity.

Amorphous and semi-crystalline polyesters can be obtained by known methods. Thus, amorphous polyesters are usually obtained by the methods in the melt and crystalline polyesters are usually obtained through a combination of procedures polycondensation in the melt and in the solid phase.

Mainly complex polyester is amorphous.

Usually complex polyester obtained by polycondensation of one or more of the e glycols). It should be recalled that the complex polyester derived from polycondensation medium consisting of terephthalic acid and ethylene glycol, commonly referred to as "polyethylene terephthalate" and is usually abbreviated as "PET".

Preferred complex polyester is a copolymer, which can be obtained by condensation (also referred to as polycondensation) of terephthalic acid with ethylene glycol and diola containing at least three carbon atoms. Such a complex polyester is usually called "polyethylenterephtalate" and is usually denoted by the abbreviation "PETG".

This means that the polycondensation environment contains terephthalic acid, ethylene glycol, diol containing at least three carbon atoms and, if necessary, other decollate and/or other diols.

Commonly used complex polyester is a copolymer obtained in the copolymerization process (in fact, polycondensation) of terephthalic acid with ethylene glycol and cyclohexanedimethanol, in particular when it is amorphous. This means that the polycondensation environment contains terephthalic acid, ethylene glycol, cyclohexanedimethanol and, if necessary, other decollate, and/or other diols; end complex poliey the Fira may contain from 70 to 100% (mole.) terephthalic acid and from 0 to 30% (mole.) another acid, selected from isophthalic acid, naphthaleneboronic acid, 1,4-cyclohexanedicarboxylic acid or mixtures thereof.

Mainly digitata component contains from 80 to 100% (mole.) terephthalic acid and from 0 to 20% (mole.) isophthalic acid.

Digitata component can be modified by a small amount (up to 10% mole.) decollate containing from 4 to 40 carbon atoms, such as isomer naphthaleneboronic acid, or mixtures thereof, and isomers of 1,4-, 1,5-, 2,6 - and 2,7 - are preferred; or such as CIS-isomer, TRANS-isomer or mixture of isomers of CIS/TRANS 1,4-cyclohexanedicarboxylic acid, or such as sulfoisophthalic acid.

Dealova complex component of the polyester may be derived from diols (i.e., glycols containing from 2 to 10 carbon atoms, and mixtures thereof. Preferably dealova constituent contains from 2 to 99% (mole.) 1,4 - cyclohexanedimethanol and from 1 to 98% (mole.) of ethylene glycol and preferably from 25 to 40% (mole.) 1,4-cyclohexanedimethanol and from 75% to 60% (mole.) of ethylene glycol.

Dealova component can be modified up to 20% (mole.) other glycols, such as diethylene glycol, neopentylglycol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,8-octane is di such characteristic viscosity which ranges from 0.4 to 1.5 deciliter/g, and preferably from 0.6 to 1.2 deciliter/g; and the above-mentioned viscosity is determined at 25oWith using 0.25 g polymer per 100 ml of solvent composed of 60% by weight phenol and 40% by weight of tetrachlorethane.

For the case with a film containing at least three main layers, the value above, the middle layer may be from 40 to 80% by weight by weight of the film.

For the case with a film containing at least three main layers, the value of the above can, for example, to produce a composition in which the intermediate layer contains mainly the polymer of ethylene is from 40 to 80% by weight of the weight of the film; and each of the other two layers consists of a complex of the polyester, which is a copolymer obtained by condensation of terephthalic acid with ethylene glycol, and diola containing at least three carbon atoms; each of these other two layers is from 10 to 30% by weight of the film; and the above complex polyester is preferably amorphous; and the above-mentioned diol containing at least three carbon atoms, may be cyclohexanedimethanol.

If necessary, TEI of contact. Such binders are usually present between the film layers from 1 to 5 microns.

It is also possible to mix one or several connecting at least one of the materials that comprise at least one of the layers of the film in such a way as to increase the compatibility and, thus, the adhesion layer above at least one of the layers, which is adjacent to it. Usually, such a binder may be present in the selected layer from 10 to 40% by mass.

Of course, that at least one of ingredients (a binder and/or thermoplastic resin), suitable for the manufacture of the film may contain at least additive or filler, such as dye or pigment, anti-oxidant agent, antiultraviolet agent, sliding agent, antibioticuse agent entered based on the selected ingredient in the usual way, well-known specialist in this field. For the case of the multilayer film and for the case when this film was intended for wrapping a food product, it will be possible, depending on the case, to give preference to the introduction of additives or fillers in the middle layer of the film, if there is a desire to reduce the risk of contamination by additives or filler ocansey least one ingredient of the film before its preparation by extrusion or coextrusion. If the multilayer film, the slip agent is introduced mainly in the outer coextruded layers. Such sliding agent is selected among, for example, fatty acid amides, as erucic acid amide, and can be entered from 200 to 5000 million on thermoplastic material from which is obtained a layer or layers of a film containing the slip agent.

Typically, the sliding agent is introduced into the film, if not provided to expose her to the plating or embossing.

At least one antibioticuse agent can be introduced in at least one ingredient of the film before its preparation by extrusion or coextrusion.

For the case when the film contains several layers, antibioticuse agent is injected mainly so that he was near the outer layers of the film (for example, when both the outermost layer coextrudable, but are under nanoextraction layer or layers, i.e. layers of embossing and/or metallization, and/or impregnated with an anti-static agent, if the latter is provided.

This antibioticuse agent tends to reduce the tendency of the film to fit snugly to myself at the time, as she rolled up to obligat silicon dioxide, and can be put inside at least one of the layers in the form of masterbatches: mineral filler/thermoplastic resin.

When antibioticuse agent contains mineral filler, antibioticuse agent can be introduced at least in one layer so that the mineral filler is present in the above layer is from 100 to 10,000 million D.

Previously to its use for wrapping items you can give the film antistatic properties. These antistatic properties allow the film is well maintained in a flat condition and good to slide on the mechanisms for its production, with no tendency to slowerthan, because there would be the risk of breaking or even stop the process of manufacture.

These antistatic properties can be imparted to the film based on principles known to the person skilled in the art, i.e., either by introducing at least one antistatic agent is at least one of ingredients (resin and/or binder), included in the film, before making this last, or by impregnation of the film by its external layers with a solution of an antistatic agent, or by any other sootvetstvuyshee impregnation by means of an antistatic agent coincides with the end surface of the film thus that it leads to the production of the outer layers of the film.

Thus, the impregnated antistatic agent is, in particular, after a possible stage stamping.

Usually there is no need to resort to the impregnated antistatic agent, if the film was subjected to metallization.

For the case when you want to put on the foil stamping and/or to perform the metallization, it is preferable to perform processing of coronary discharge on the film before the above embossed and/or metallized. Such processing may be applied on the film according to the invention on the basis of the principles known to the person skilled in the art. However, if the film is essentially a single layer or constructed so that the external coextrudable layers contain at least one complex polyester, a satisfactory result metallization is achieved even in the absence of treatment of coronary discharge.

The film used in the framework of the inventive concept, for example, can be obtained by extrusion or coextrusion flat filiere (often called extrusion cast) or by extrusion or coextrusion followed blown (also called "tubular"). The term "extrusion" raspredelenie film, consisting of at least two layers.

In the method of extrusion or coextrusion flat filiere flat extruded film or coextrusion and placed in a continuous manner on the shaft-cooler, also known as "chill-roll.

After extrusion or coextrusion flat filiere film mainly exposed monoaxially or biaxially stretching (respectively producing one mono - or biorientation) based on principles known to the person skilled in the art. Monoaxial stretching is carried out in the direction of extrusion or coextrusion; while the biaxial stretching is carried out simultaneously in the direction of extrusion and coextrusion and in the direction perpendicular to the extrusion and coextrusion. Ways to use "cast" allows you to benefit from the effect of the processing planes shaft-cooler, allowing one to obtain a particularly smooth film and presenting the result of this beautiful surface condition.

Mono - or reorientate has, in particular, the effect of increasing the density of the film and reduce its resistance at the beginning of the deployment.

Pulling or beverageware can be carried out continuously or "Reprise", i.e. after you have attached odonovan, or would have been subject to the first elongate.

In the method of extrusion or coextrusion followed by blown film extruded or coextrusion in the form of a cylindrical bubble, obtained by blowing with the end of the nozzle, since the annular die. For this method, the degree of stretching can be from 2 to 50 and preferably from 10 to 30; the degree of the bulge can be from 1 to 10 and preferably from 1.5 to 3; the air gap may be from 0.5 to 5 mm and preferably from 0.8 to 1.6 mm, you Can adjust the speed of extrusion, in order to influence the film thickness. Usually the rate of extrusion may be from 10 to 150 m/min and preferably from 30 to 60 m/min.

For the case when I wish to make a significant beverageware on film, extrusion or coextrusion can be carried out by applying the method of "double bubble"; both "bubble" above method to form one after another, usually continuously.

Example 1 Here will be described an example of the manufacture and use of a three-layer film type complex polyester / polyolefin / complex polyester. In this example, the source materials are indicated by abbreviations, the values of which are given in table 1.

Three layers is the third: the temperature of the mixture screw PETG/AB - 220oWith the temperature of the mixture screw MDPE/HDPE/terpolymer - 180oWith the temperature of the die - 190oWith a head Temperature of 200oWith the Degree of stretching - 20
The degree of blown - 2
An air gap of 1.2 mm
Speed drawing - 40 m/min
The obtained film has a width of 800 mm and a total thickness of 28 μm and a density of about 1.1.

From the film cut a rectangle of size 60 x 90 mm and manually wrapped candy, generating the wrapper, rotating the film in 1/2 turn with one hand against the candy held with the other hand. It is established that the wrap is not noticeable tendency to return back.

Example 2 (comparative)
Cut off from the film of reorientating polypropylene rectangle 60 x 90 mm and wrapped candy is exactly the same as in example 1. It is established that the wrapper shows a marked tendency to acquire original form.


Claims

1. The set containing the solid body and the packing having at least one film of a thickness of from 10 to 60 μm, in the form of at least one wrapper and/or package having three layers, two of which contain at least one complex of the polyester obtained by the condensation of terephthalic acid , one polyolefin and is in the middle, the sum of the masses of the layers containing complex polyester is at least 20% by weight by weight of the film, while the film contains at least one antibioticuse agent and/or a slip agent.

2. Set under item 1, in which the package is directly adjacent to the greater part of the surface of the Packed solid.

3. Set according to any one of paragraphs.1 and 2, in which the solid body is a product of power, and, in particular sweet.

4. Set according to any one of paragraphs.1-3, in which the packaging is free from bonding with adhesive tape or glue, sealing at high or low temperature, special fastening means going beyond the thickness of the above film.

5. Set according to any one of paragraphs. 1-4, in which complex the polyester is amorphous.

6. Set according to any one of paragraphs.1-5, in which the film contains a plane of symmetry which is parallel thereto, and symmetry refers to both the geometry and the composition of the above film.

7. Set according to any one of paragraphs.1-6, in which the sum of the masses of the three layers is at least 80% by weight of the total film, and each of these three layers is at least 10% by weight of the total weight of the film.

8. Set according to any one of paragraphs.6 and 7, in which the average Soi mid ranges from 40 to 80% by weight by weight of the film.

10. Set according to any one of paragraphs.1-9, in which diola is cyclohexanedimethanol.

11. Set on p. 10, in which digitata component of a complex of the polyester contains from 70 to 100 mol.% terephthalic acid and from 0 to 30 mol.% another acid selected from isophthalic acid, naphthaleneboronic acid, 1,4-cyclohexanedicarboxylic acid or their mixtures, and dealova component of a complex of the polyester contains from 2 to 99 mol.% 1,4-cyclohexanedimethanol and from 1 to 98 mol.% of ethylene glycol.

12. Set on p. 11, in which digitata component of a complex of the polyester contains from 80 to 100 mol.% terephthalic acid, and from 0 to 20 mol.% isophthalic acid, and dealova component of a complex of the polyester contains from 25 to 40 mol.% 1,4-cyclohexanedimethanol and from 75 to 60 mol.% of ethylene glycol.

13. Set according to any one of paragraphs.1-12, in which the film is made with embossed and/or metallized.

14. The film thickness of from 10 to 60 μm, containing three layers, two of which contain at least one complex of the polyester obtained by the condensation of terephthalic acid with ethylene glycol and diola having at least three carbon atoms, and one of the layers contains at least one polyolefin and is in the middle, the sum of the masses of the layers, the soda is Nisha least one antibioticuse agent and/or a slip agent and has a plane of symmetry, which is parallel to it, and refers to the geometry and composition of the film.

15. Film on p. 14, which complicated the polyester is amorphous.

16. The film according to any one of paragraphs.14 and 15, in which the sum of the masses of the three layers is at least 80% by weight of the total film, and each of these three layers is at least 10% by weight of the total weight of the film.

17. The film according to any one of paragraphs.15 and 16, in which the middle layer contains at least 60% of a polymer of ethylene.

18. The film according to any one of paragraphs.15-17, in which the middle layer is from 40 to 80% by weight by weight of the film.

19. The film according to any one of paragraphs.14-18, in which diola is cyclohexanedimethanol.

20. Film on p. 19, in which digitata component of a complex of the polyester contains from 70 to 100 mol.% terephthalic acid and from 0 to 30 mol.% another acid selected from isophthalic acid, naphthaleneboronic acid, 1,4-cyclohexanedicarboxylic acid or their mixtures, and dealova component of a complex of the polyester contains from 2 to 99 mol.% 1,4-cyclohexanedimethanol and from 1 to 98 mol.% of ethylene glycol.

21. Film on p. 20, in which digitata component of a complex of the polyester contains from 80 to 100 mol.% terephthalic acid and from 0 to 20 mol.% isophthalic acid,% of ethylene glycol.

22. The film according to any one of paragraphs.14-21, which is subjected to embossing and/or metallization.

23. A method of producing a film according to any one of paragraphs.14-22, which includes the step of coextrusion and subsequent blowing of different thermoplastic compositions, which are different layers of the film, followed by at least stage monoaxial stretching or biaxial stretching, and the operating parameters of the phase of coextrusion and subsequent blowing of the following:
The degree of stretch - 2-50
The degree of blown - 1-10
The air gap is 0.5 - 5 mm
Speed drawing - 10-150 m/min
24. The method according to p. 23, in which the operating parameters of the phase of coextrusion and subsequent blowing of the following:
The degree of stretch - 10-30
The degree of blown - 1,5-3
The air gap is 0.8 - 1.6 mm
Speed drawing - 30-60 m/min
25. The method according to any of paragraphs.23 and 24, in which the film is subjected to at least stage antistatic treatment, and/or metallization, and/or embossing.

 

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FIELD: film for food packing.

SUBSTANCE: claimed tubular film contains at least three polyamide layers, wherein each layer consists mixture of (mass parts) polyamide 6 70-77; polycaprolactam-hexamethylenediamine-adipic acid copolymer 5-11; amorphous resin 20-25; aromatic polyamide containing hexamethylene diamine and terephthalic acid units in molecule 3-8; and mixture of acid modified copolymers 0.3-5.

EFFECT: film of improved barrier properties, moldability, abrasive and oil resistance.

3 cl

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