Composition to obtain dissolve, not vapor permeable coatings for flexible paper packaging material and method for processing flexible paper packaging material

 

(57) Abstract:

Describes the composition to obtain by not passing pairs coatings for flexible paper packaging material containing a polymer emulsion, which provides a barrier against water vapor and in which the polymer in the emulsion has a distribution of particle size less than about 10 μm, and a polymer selected from the group consisting of polyvinylidenefluoride, copolymer of vinylidenechloride, methyl methacrylate and Acrylonitrile, and mixtures thereof, and an additive consisting of fine material having an average particle size less than about 10 microns, and fine material capable of intermediate combining with the above polymer particles with obtaining coatings on flexible packaging material that retains prabaramee properties attached to said polymer, and which upon the dissolution of crushed particles usually less than about 1.6 mm, and this composition has a pH between about less than 2 and 8, which is selected to provide the specified grinding of the coating on the particles is typically less than 1.6 mm is also Described a method of processing a flexible paper packaging material. Technical is an increase re-use and/or screened packaging. 4 C. and 6 C.p. f-crystals, 4 Il.

The invention relates to compositions for receipt by coating with ParameterName properties for flexible packaging, flexible packaging with such a coating. The invention also relates to a method of processing a flexible packaging material having prabaramee coating, whereby the coating is mixed with cellulose fibers to obtain a slurry, ensuring the preparation of fibers for her education. The invention also relates to flexible packaging, provided with a coating that allows you to use the valuable paper products.

In modern practice, in order to obtain a flexible, vapor-proof packaging on a paper basis or between two sheets of paper add a film of polyethylene, wax or polyvinylidenechloride /PVDC/ coating and base paper and the sheets of paper called the substrate ("liner").

Currently, all coatings with barrier properties water vapour are closed flower.

Also use other resin to obtain a flexible packaging material having a low transmittance vapor, such as polyacrylates, polyvinyl acetate and the like. However, p is reed.

Coatings with barrier properties for moisture that is present in the packaging materials, not leaky, are plants recycling nerazrushennymi, mainly because they create problems in the process of regenerating fibers, or by stopping the process due to the blockage of the sieve, or through contamination of the final product.

Currently, more than 20% of all papers and boards produced in the world, laminate, as described above, which makes products that are unsuitable for recycling.

The lack of packaging, coated with polyethylene, wax or PVDC, is that it is difficult to process with the aim of re-use and it is usually discarded. Recycling of packaging materials with barrier properties with respect to moisture is an important task of the paper mills and their customers.

Dissolution (Reformirovanie) of these materials poses specific challenges for the industry. Water protection complicates the extraction of fibers used of these packaging materials, and most of the recycling plants are not able to overcome the problem of dissolution. Currently almost all of these packaging materials Snogo fiber is an important source of cellulose fibres, while the above problems these materials are usually thrown away with the creation of environmental pollution, which is unacceptable. Processing package based on cellulose fibers is an increasingly important source of cellulose fibers, and loss of fibers of high quality and value are more unacceptable since they make up the millions of tons of waste.

For recycling cellulose fibers are usually used in two ways. The first method involves the destruction of the source of cellulose fibers, such as paper component of the packaging material, and the fiber components as a result of dissolution, and any other material is filtered using traditional equipment. The second method involves grinding packaging so that any additional material, such as a floor, is destroyed by very small particles less than 1.6 mm, which will pass through a sieve together with the fibers, which form the slurry. This second method is usually performed with the use of additional equipment and/or chemicals, which makes it very expensive.

Unfortunately, none of polymeric materials which can be recycled without additional stages of manufacturing, provided facilitation of re-use. In addition, the presence of wax in the coating with blagovernyi properties reduces the output of the pulp and therefore increases the amount of waste.

In the method of the dissolution of barriers based wax is crushed into very small particles /less than 0.7 mm/ a, which pass through the sieve and are in the pulp, which is served in a paper machine, as well as "white" (process) water.

The problems associated with the dissolution of the barriers on the basis of the wax, the following:

the wax particles clog the filter;

- particles of the wax stick to the drying cylinder, causing tearing of the paper;

the wax is on the product surface, resulting in surface defects of paper and printing problems, and also causes the viscosity of the final product;

- reduced output suitable pulp.

On the other hand, when lagomarcino the polyethylene coating is used, the apparatus for the dissolution of his crush large pieces of films, ranging in length from about 0.3 to 2.5, see Polyethylene scores sieve, requires stopping to clean and gives solid waste.

The problems associated with polyvinylidenechloride barrier coatings, usually the same problems, is that it is providing barrier coatings with excellent steam barrier, good oxygen barrier as well as good chemical resistance at relatively low cost, it is commercially preferred for the manufacture of paper or similar material, and therefore desirable such flexible packaging, which contains PVDC coating, which can be fully recycled and reused.

However, at the present state of the prior art, any attempt to improve responselist PVDC and other types of polymeric materials through the use of materials or processing that increases the rigidity of the film, leads to a sudden loss of its barrier properties, which of course is unacceptable.

Coatings based on PVDC are known, for example, from the patent application in the UK 1.583.947, published February 4, 1981 (Frederick Douglass HOU). However, these coatings are applied on the paper to obtain the transition sheet. The patent concerns the recycling of this coated paper and does not provide guidance about how to obtain coverage, which can be dissolved together with the paper fibers.

Patent UK 2.039.789 published 10 is selecionado water-dispersible polymer and smectite. In this patent there is no teaching about how to obtain coverage, which is characterized by a vapour barrier and at the same time is opening when it is grinding in the mixed slurry.

Richard M. Podhajny in "The Search for Alternative Moisture-Barrier Coatings", Converting Magazine, August 1995, argues that alternative PVDC urgently needed because of the pollution, when Pets presence of PVDC in the wastewater. Although PVDC coatings with or without additives are known, it appears that the corresponding formulation in which the coating is to be mixed with the pulp when you use and therefore will not contaminate the environment, yet nobody is received.

In the work of B. Alince and P. Lepoutre, TAPPI Journal, vol. 66, No. 11, pp. 57 and 58, describes that the viscosity of aqueous suspensions is improved at low shear when using clay, calcium carbonate and latex, which may be polystyrene.

Japanese application 06136698 considers base paper from wood pulp and the barrier layer containing PVDC-latex as a binder. Patent WO 93/13264 mainly describes the material of the substrate containing a thermoplastic polymer, such as PVDC-latex, and an additive, which may be t the production needs, it is impossible to maintain the desired flow of raw paper at the expense of forests, should be found the means of obtaining a sufficient number of fibers to meet demand.

Therefore, the present invention is the creation of a modified door polyvinylidenechloride cover with ParameterName properties for flexible packaging, which involves retrieving reusable and/or the materials of the packaging and which is an excellent barrier to water vapour, oxygen barrier, has excellent chemical resistance and provides high strength binding for the lamination of paper.

Another objective of the invention is to provide modified by polyvinylidenechloride coating, which when applied to paper or cardboard substrate provides adequate water protection and prevents its dissolution, the processing in a paper machine or the final processing of the product.

Another objective of the invention is to provide modified by polyvinylidenechloride coating, which, when dissolution is crushed into small particles, preferably less than 1.6 mm, and very easily defibered, thereby minimizing the amount of waste.

Another object of the invention is the creation of a modified door polyvinylidenechloride coating that does not solid waste when recycled, which is not dissolved in the process water and does not increase BOD /biochemical oxygen demand/ wastewater, and which gives particles, which are inert and are not activated when heated.

Another object of the invention is the creation of a commercially acceptable dissolve the barrier coating, such as coating based PVDC, which basically has the same barrier properties and at least approximately the same adhesion to paper, as unmodified barrier coating, and which is in addition to what is easily removed, also dissolved at a low cost.

Another objective of the present invention is to provide a composition coating for flexible packaging having improved rheology flow in order to improve the characteristics of fluidity and to prevent the coating from penetrating into porous paper, as in the case of PVDC with nikodimou viscosity used in the present time.

The other is the investigation, which suggests an appropriate chemical treatment to extract the pure fibers.

And another object of the invention is to create a flexible barrier coatings that can be laminated on the layer of the paper base without the use of glue.

According to the invention, is provided a composition for obtaining dissolve barrier water vapour for flexible packaging material containing a polymer emulsion in which the polymer has an average distribution of particle size less than about 10 microns, and an additive consisting of microdispersed material having an average particle size of about 10 microns and capable of intermediate combining with the polymer particles, obtaining coatings on flexible packaging material that retains barrier properties water vapour attached to the polymer, and which upon the dissolution of crushed particles are typically less than about 1.6 mm, the pH of the composition should be such, to ensure that the grinding of the coating on the particles is usually less than 1,6 mm

Also, according to the invention, proposes a method of processing a flexible paper packaging material having prabaramee coating that provides the var the coating contains a mixture, containing grades and additives in fine form, which is able to interim combined with particles of polyvinylidenechloride, and forming a coating on a flexible paper packaging material that retains prabaramee properties given to it by grades. The method involves grinding the packaging material including the coating on the particles, at least about 95% of which are typically less than 1.6 mm, sieving and separating any particles more than 1.6 mm and receiving pulp from the remaining particles.

Although many polymers can be used to obtain ParameterName coating according to the invention, as is well known in the art, the preferred polymers include grades, a copolymer of vinylidenechloride, methyl methacrylate and Acrylonitrile, or mixtures thereof.

Similarly, with respect to the adhesive, the preferred adhesives are hydrated aluminum silicate, calcium carbonate, polyvinyl acetate Homo-polymer, and mixtures thereof.

In practice, the most interesting polymer emulsion contains grades.

The preferred polymer in the polymer emulsion is grades /PVDC/, the s region, in which polymer chains are oriented and arranged in an orderly manner. As stated in "The Search for Alternative Moisture-Barrier Coating, Converting Magazine, August 1995, these circuits are formed a strong and interactive communication. The interaction between hydrogen atoms and chlorine provide strong attraction circuits PVDC, forming a dense three-dimensional crystal structure.

Upon the dissolution of the standard crusher mechanical force applied to the coating, is not sufficient to sever the links between these circuits and obtain particles less than 1.6 mm, so the resulting particles are usually larger than 6 mm

With the introduction of PVDC selected additives such as hydrated aluminum silicate and calcium carbonate with an average particle size less than about 10 μm, and the selection of the critical pH in the composition, still crystallinity, but when chopping, it becomes possible to obtain smaller particles due to the presence of additives.

As indicated above, the pH of the solution is critical. For example, gidratirovannym a silicate of aluminum pH is usually lower than or equal to about 2. With calcium carbonate pH usually between 6 and 7.

No doubt, too much concentration of additives will quickly reduce the resistance clicks is, the hen as an additive is polyvinyl acetate. This Supplement is not suitable for obtaining a mixture with good raspuschennosti as hydrated aluminum silicate or calcium carbonate, however, it has a less negative effect on the permeability barrier coatings. On the other hand, the combined use of polyvinyl acetate and calcium carbonate gives excellent results in relation to the raveled out and breathability. Other additives which give satisfactory results, include emulsions of polystyrene, polyacrylate and the like.

The invention is further illustrated by non-limiting examples with reference to the drawings, in which:

Fig. 1 - paper obtained using pure cellulose fibres;

Fig. 2 - the paper, obtained by dissolution of flexible packaging with steam barrier according to the invention;

Fig. 3 - the paper in Fig. 1, in which the steam is a barrier PVDC;

Fig. 4 - the paper in Fig. 1, in which the steam barrier is polyethylene.

It is easy to see that in practice, the known coating is not spreading, whereas the present invention provides the paper, which is almost equivalent buildingbridges emulsion, supplied under the trademark of Serpin 2022, with 20 hours of suspension of hydrated silicate of aluminium supplied under the brand name of Omnitel (OMNIFIL) pH of the mixture containing 54,5 % of solid material, adjusted to 2.1. and flexible packaging paper product form a coating using the above-mentioned mixture. Upon the dissolution of a coating product is crushed into particles less than 1.5 mm, which is capable of dispergirujutsja almost all spreading the floor.

The transmittance of water vapor /APRC/ at 100% relative humidity and 37.8oC to 25 g/m2the coating on the carton base: 15 g/m2/24 h

Example 2. In example 1, except that instead of Omnifile (Omnifil) use 10 hours of calcium carbonate, supplied under the trade mark Polpro 3 (Pulpro 3) and 10 hours of polyvinyl acetate homopolymer supplied under the trade name Duratec (Daratack) 71L. The pH adjusted to 6.2. The content of solid material in the mixture of 55.7%. As a result of dissolution of the obtained particles is less than 1, 2 mm.

APRC: 4 g/m2/24 h

Example 3. In example 1, except that use 66 h Serpina (Serfene 2022) with 27 PM Darana (Daran)12 SLI, which is a copolymer of vinylidenechloride, methyl methacrylate is 51,5%. As a result of dissolution of the obtained particles less than 1.5 mm

APRC: 1.5 g/m2/24 h

Example 4. In example 1, except that use 85 h Serpina (Serfene) 2022 15 hours of Daratech (Daratack)71L. The pH value is adjusted to 2.1, and the content of solid material in the mixture of 50.8 per cent. As a result of dissolution of the obtained particles less than 1.5 mm, which provides responselist all coatings.

APRC: 4 g/m2/24 h

Example 5. In example 1, except that use 75 hours Serpina (Serfene) 2022 15 PM Pulpo (Pulpro) 8/ brand powdered calcium carbonate, to some extent larger than Pulpo (Pulpro) 3/, and 10 hours of Daratech (Daratack) 71L. The pH adjusted to 6.2. The content of solid material in a mixture of 58%. As a result of dissolution of the obtained particles less than 1.5 mm

APRC: 8 g/m2/24 h

Example 6. In example 1, except that use 75 hours Serpina (Serfene) 2022 11 o'clock Pulpo (Pulpro) 8 and 14 hours of Litron (Lytron) 604 /brand emulsion homogeneous solid lightweight spherical particles of polystyrene polymer/. The pH of the mixture of 6.1, and the content of solid material in a mixture of 54%. As a result of dissolution receive particles less than 1.6 mm

APRC: 5 g/m2/24 h

Tests made with paper coated with the composition according to the invention showed that the dissolution provides about 97% of particles less than 1.6 mm after 30 min of dissolution.

It is obvious that modifications are possible, as it is easy to see specialists without departing from the scope of the present invention defined by the attached claims.

1. Composition to obtain dissolve, not vapor permeable coatings for flexible paper packaging material containing a polymer emulsion, which provides a barrier against water vapor and in which the polymer in the emulsion has a distribution of particle size less than about 10 μm, and a polymer selected from the group consisting of polyvinylidenefluoride, copolymer of vinylidenechloride, methyl methacrylate and Acrylonitrile, and mixtures thereof, and an additive consisting of fine material having an average particle size less than about 10 microns, and fine material capable of intermediate combining with the above polymer particles with obtaining coatings on flexible packaging mA is solches to particles generally less than about 1.6 mm, moreover, this composition has a pH between about less than 2 and 8, which is selected to provide the specified grinding of the coating on the particles is typically less than 1.6 mm

2. The composition according to p. 1, wherein the additive is selected from the group consisting of hydrated aluminium silicate, calcium carbonate, polyvinyl acetate of homopolymer and mixtures thereof.

3. The composition according to p. 1, characterized in that the polymer emulsion contains grades.

4. The composition according to p. 3, wherein the additive consists of a suspension of hydrated silicate of aluminum, and the pH value of the specified composition is then adjusted to less than 2.

5. The composition according to p. 3, characterized in that the additive comprises calcium carbonate, and the pH is between about 6 and 7.

6. The composition according to p. 3, characterized in that the additive comprises polyvinyl acetate Homo-polymer, and the pH is about 2.

7. Composition for receipt by coating with ParameterName properties for flexible paper packaging material containing a polymer emulsion containing the grades in which grades in the emulsion has a distribution by the average size of the Oia, with the distribution of average particle size less than about 10 microns, and the composition has a pH value of about 2; and the specified fine digidrirovanny aluminum silicate able to interim combined with particles of polyvinylidenechloride obtaining coatings on flexible packaging material that retains prabaramee properties attached to the specified grades, and which upon the dissolution of crushed particles usually less than about 1.6 mm

8. Composition to provide dissolve ParameterName coatings for flexible paper packaging material containing a polymer emulsion containing the grades in which grades in the emulsion has a distribution according to the average particle size of less than about 10 μm, the additive containing finely-divided calcium carbonate having a distribution of average particle size less than about 10 microns, and this composition has a pH of about 6; and the fine material is capable of intermediate combining with particles of polyvinylidenechloride obtaining coatings on flexible packaging material that retains prabaramee properties, giving the 1,6 mm

9. The composition according to p. 8, wherein the additive further comprises a polyvinyl acetate polymer having almost the same distribution on the average size of the particles, and calcium carbonate.

10. Method for processing flexible paper packaging material coated with ParameterName properties, providing that the packaging material is dispersed into its constituent fibers and particles of the specified coating, wherein the coating contains a mixture containing grades and additives in fine form, having an average particle size less than about 10 μm, which is able to interim combined with particles of the specified polyvinylidenechloride to obtain coverage on the specified flexible paper packaging material that retains prabaramee properties attached by grades, and the method further shredding the specified packaging material including a coating on the particles, at least about 95% of which have a size of less than 1.6 mm, sieving and separation of all particles larger than 1.6 mm and receiving pulp from the remaining particles.

 

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