FI120903B - Packing material with fiber bottom, intended for autoclave packaging - Google Patents

Description

Fiber-based packaging material for autoclave packaging State of the art

The present invention relates to a packaging material for an autoclave package comprising a fibrous base having one or more polymer layers on the outside and / or on the inside and wherein the fibrous base has been treated with a hydrophobic adhesive. The invention further encompasses the use of such packaging material for autoclavable product packaging.

The use of fiber-based packaging materials in autoclavable packaging is known. The fiber-based packaging material 10 for autoclaving is typically coated, for example with a polymer coating, to prevent the fiber base from wetting due to the effects of the product and / or external moisture, particularly water vapor used in the autoclave treatment.

Many different coating polymers can be used to seal the packaging material against moisture or water vapor. In addition, the number and thickness of the polymer layers may vary depending on e.g. the polymer used. Polyolefins such as low density polyethylene (LDPE) or polypropylene (PP) are commonly used as moisture barrier and, when arranged as the outermost coating layer, also serve as an effective heat seal polymer. further, polyesters such as polyethylene terephthalate (PET) may be used. Oxygen barrier polymers include, for example, ethylene-vinyl alcohol: V: 20 lipolymer (EVOH) and polyamide (PA). Aluminum foil is also commonly used in fiber-based autoclave packages.

* • · · • ·

One problem with a fiber-based autoclave package, e.g., a can, case or box made of packaging cardboard, is that, for example, during autoclaving treatment, liquid or moisture can penetrate from the cutting edges (= raw edge) of the package. This so-called. attempts have been made to solve the problem of 'raw edge-penetration' or 'edge-soaking'. chemical or mechanical protection of the cutting edges of the material, eg by folding. Chemical protection has been implemented. by impregnating the cutting edges with a hydrophobic adhesive.

• ·· • *

For example, WO 02/090206 describes a method in which water penetration:] ·. Attempts have been made to reduce the size of the packing material by making the entire fiber base sheet hydrophobic with an aqueous suspension or emulsion of an alkyl ketene dimer (AKD) adhesive. In WO 03/021040, a fiber base of a specific density (700-850 kg / m3) is used in addition to hydrophobic adhesive treatment. In both publications, AKD is used in an amount of about 2-4 kg / t of dry fiber base to obtain material resistant to autoclaving.

FI 84197, US 5626719, WO 01/49938, EP 1091043 and EP 292975 disclose liquid packaging materials for aseptic packaging, for example, by treatment with hydrogen peroxide solution, e.g. at about 80 ° C, for sterilization. Ko. the publications disclose applications which seek to solve the crude edge absorption due to lactic acid solution, coffee and / or hydrogen peroxide treatment at normal pressure. Containers suitable for autoclaving under pressure and above 100 ° C have not been proposed.

Purpose of the Invention

It is an object of the present invention to provide a fiber-based packaging material for autoclave packaging, wherein an alternative solution to the crude edge absorption problem has been developed that can improve the fiber-based resilience under autoclaving conditions.

It is a further object of the invention to provide a fiber-based material suitable for autoclave packages, which, in terms of mechanical properties, provides further alternatives to the fiber-based packaging materials useful in autoclave packages.

DETAILED DESCRIPTION OF THE INVENTION It has now been found that in a fiber-based package, the absorption / penetration of water or vapor from the shear edge can be significantly reduced (referred to below as '' reduction of the raw edge suction '') -: A combination of V rophobic glue and wet glue.

• · • * • · Hydrophobic effect of wet glue combined with hydrophobic glue * ··. With 25 it is surprising, because that. glue generally has another use in the art. It is · · used in packaging materials that are not specifically protected against moisture. whereby its purpose is to increase the strength of wet paper or board. packages •. * ·· when it gets wet. This is known as the "wet strength improving agent". The autoclave packaging material is a special application specifically intended to prevent moisture: 30 from penetrating the fiber base, so that no wet-glue is used. autoclave • · · packaging material.

• · · * 3

The packaging material for the autoclave packaging according to the invention is thus characterized in that the fibrous base has been treated with a wet-bone adhesive, a hydrophobic adhesive and an aluminum compound to reduce the raw edge suction of the packaging and 0.3-4 kg / t dry fiber-base is used. 0.1-20 kg / t dry fiber base and aluminum compound have been used.

Furthermore, the present invention makes it possible to use smaller amounts of the hydrophobic adhesive than in the prior art to provide good autoclave resistance, thereby providing advantages in the board or paper making process 10 and in the conversion process. For example, as a result of lowering the dosage level of the hydrophobic adhesive, adhesion of the plastic coatings to the treated fiber base is also improved, which in turn has a beneficial effect on the autoclave resistance of the package.

In addition, the combination of the invention makes it possible to use a lower density fiber base in autoclave packages, which increases the flexibility of the mechanical properties of the package in the field of autoclave packaging applications.

The terms used in the present application have the following meaning: '' 'Fiber backing' 'is preferably bleached pulp wrapping paper or paperboard, the manufacture of which is well known in the paper industry.

'' Autoclaving '' means the treatment of a container, eg an empty container, or a container containing a product 20 (e.g. a foodstuff), at an elevated temperature: * · *. e.g. 100 to 200 ° C, usually 120 to 130 ° C, by means of steam such as water vapor, generally under pressurized conditions, typically under saturated vapor pressure. Usually, treatment is used to sterilize the packaging product, i.e., to destroy and • · to prevent harmful microbial growth.

· "* 25 in the food and pharmaceutical industries. Examples of conditions include ... closed treatment at about 125eC for 45 min or 60 min. Autoclave equipment is commercially available and autoclaving conditions for sterilizing a packaging product are well known.

• · • * '' Autoclave Packaging 'refers to packaging made of **: *' 30 fibrous base material and suitable for the above autoclaving process, i. has been made water repellent and heat resistant, e.g. by means of hydro-phobic adhesive and possibly coating layers such as polymer coatings.

4 '' Hydrophobic adhesive '' means any adhesive which renders the fiber backing water-repellent or hydrophobic. This bathing group is commonly known in the art, e.g., by the name of '' sizing agent ''.

One useful hydrophobic adhesive is an adhesive consisting of a reaction product of mg succinic anhydride and a mixture of hydrocarbyl or hydrocarbyls, e.g. an olefin or a mixture of olefins having more than 13 carbons. In this context, the. the adhesive is known in the art as an ASA adhesive, which is preferably a reaction product of a mixture of succinic anhydride and 13-25 carbon, straight-chain or branched olefins. The olefin moiety may consist of a straight-chained and branched mixture of C 13 -C 25 alkenes. Preferably, ASA is a so-called. an adhesive consisting of an alkenyl succinic anhydride, e.g., C13-C22 alkenyl marine succinic anhydride, e.g., a commercial ASA product.

A further useful hydrophobic adhesive is the so-called hydrophobic adhesive. an alkyl ketene dimer (AKD) adhesive which is well known in the art. By this is meant a hydrocarbyl ketene dimer product formed, for example, from an unsaturated or saturated, straight or branched fatty acid or from a mixture of such fatty acids, e.g., C 1-6 or longer chain fatty acids, or C 1-3 fatty acids, e.g. , such as C16, C18, C20 or C22, preferably C16 or C18, or a mixture thereof. In this yh-20 tex. the products are referred to as "alkyl ketene dimer" (AKD) in accordance with industry practice. A preferred AKD adhesive is a commercial product wherein the hydrocarbon chain of the ketene: Y: dimer is formed from a mixture of C16 and C18 fatty acids (C16 / C18: T: AKD).

Thus, commercially available products may be used as both ASA and AKD adhesives, which may be in the form of an aqueous suspension or emulsion, and may include: also contains other additives.

. * · *. '' Wet Melt Adhesive '' means a group of adhesives well known in the art, which, as mentioned above, are used to enhance / improve wet paper or cardboard strength ("wet strength improving agent"). Such adhesives include e.g. polyamide - ** do 30 doamine-epichlorohydrin resin (PAAE), urea-formaldehyde resin (UF), melamides ni-formaldehyde resin (MF), polyacrylamide / glyoxal condensate, polyvinyls: ·. liamine, polyurethane, polyisocyanate. Preferred adhesives include e.g.

! · · ·! PAAE and isocyanate, in particular PAAE adhesive.

• · ·· * 5

The amount of hydrophobic adhesive, preferably ASA, added to the fiber base is 0.3 to 4 kg / t dry fiber base, preferably 0.5 to 1.7 kg / t dry fiber base.

Wet bone glue, preferably PAAE glue, is added to the fiber base 0.2 to 12 kg / t dry fiber base, preferably 1 to 6 kg / t dry fiber base, more preferably 2 to 4 kg / t 5 dry fiber base.

In the packaging material according to the invention, for the autoclave packaging, 0.1-5 parts by weight, e.g. 0.5 to 3 parts by weight, preferably 1 to 2.5 parts by weight, such as 2 parts by weight, of hydrophobic adhesive are used. One preferred combination is a combination of PAAE and ASA used in a weight ratio of 10: 1 to 5: 1, suitably 0.5: 1 to 3: 1, more preferably 1: 1 to 2.5: 1, e.g. 2: 1.

It has now surprisingly been found that by adding to the packaging material according to the invention an aluminum salt commonly used, for example, to increase the retention of the hydrophobic adhesive in the fiber base, the autoclave resistance 15 of the packaging material can be further improved. Thus, according to a preferred embodiment of the invention, aluminum salt is added to the fiber base.

The '' aluminum compound '' can be, for example, any compound known in the manufacture of paper and board used in the prior art e.g. to increase the retention of the hydrophobic adhesive in the fiber base. Ko. the salt is preferably alum which is a specific compound thereof for use in accordance with the invention. Beer is available as a commercial product. Polyaluminium chloride (PAC), which is commercially available, can also be used, e.g. its intended purpose.

The amount of aluminum compound is 0.1 to 20 kg / t of dry fiber base, preferably 1.0 to 10 kg / t of dry fiber base.

* · 25 The weight ratio of the hydrophobic adhesive to the aluminum compound, preferably alum, is e.g. 1: 0.1 to 1: 7, preferably 1: 0.5 to 1: 5, more preferably 1: 1 to 1: 3, and as a specific example. glue: alum ratio 1: 2.

•

Further according to the invention, the autoclave packaging material has one or more, possibly pigmented, polymeric layers on the inside of the fibrous base. \ # 30 well known in the art. In one embodiment, the packaging material comprises: • · · t (in polymerization, a polymeric heat sealing layer, a white pigmented * ··· * polymerized layer, a black pigmented polymeric layer, a handwoven fiber base, one or more polymeric oxygen barrier layers, a binder layer, a light shielding layer and a polymeric heat sealing layer.

Materials known in the art may be used as the material of the polymer layers. For example, the material of the heat sealing layer is preferably polypropylene (PP), polyethylene (PE) or a copolymer thereof. The material of the oxygen barrier layer is preferably ethylene-vinyl alcohol polymer (EVOH) or polyamide (PA), most preferably EVOH.

Due to the improved autoclave resistance, the proportion of polymer coatings in the material of the invention can be reduced if desired.

The autoclave resistance of the treated fiber base can be further improved by adjusting (optimizing) its structure during manufacture. Autoclave resistance can thus be increased, e.g., by the degree of refining of the raw material (e.g., high consistency milling), by calendering / wet pressing of the fibrous web and / or by drying (e.g., Condebelt drying) of the web. Furthermore, a filler such as titanium dioxide may be added to the treated fiber base to obtain a fiber base which is very resistant to autoclaving conditions. The filler may be added e.g. from 0.1 to 10% by weight, preferably from 0.1 to 2% by weight, based on the weight of the dry fibrous base.

... The treatment of the fiber base according to the invention typically means that the fiber-based packaging material has been treated throughout, i. across the entire width of the web, with the combination of a hydrophobic adhesive and wet bone adhesive of the invention.

• · · *; ' * However, the invention also encompasses the ability to perform processing on only a portion of the material, e.g., cutting edges.

* • · · • · * ·. ***; The hydrophobic adhesive and the wet bone adhesive are preferably added in the amounts indicated above.

The addition may be carried out, for example, in a known manner in connection with the manufacture of paper and board at any stage of the manufacturing process prior to the final drying stage of the fiber base web, however preferably in connection with the fiber base stock, i.e. before placing the fiber pulp onto the wire, The combination can be incorporated evenly throughout the fabric-formed fiber-based web. Alternatively, the fibrous stock may first be formed on a wire with a fiber base; . followed by application of a hydrophobic adhesive and / or a wet bone adhesive to the fibrous substrate, e.g. by spraying onto the web. Hydrophobic adhesive and wet bone adhesive can be ** --· * adjusted at the same or different stages of the fiber base manufacturing process. Wet bone glue is added e.g. before the hydrophobic glue is added, at the same time. or after 7 additions of hydrophobic glue. The total amount of hydrophobic adhesive to be used and the wet-bone adhesive amount can be added in one process step, e.g., during stock formation, but it is also possible that one or both of these can be added. the adhesive and compound are added in more than one fiber base manufacturing step.

S As stated above, aluminum salt, preferably alum, is added to the fiber base in the above amounts, thereby further improving the resistance of the fiber base under autoclaving conditions. The addition can be carried out in a manner known in the art. According to one embodiment, the alum is added during the stock pulping process before the stock is placed on a wire.

Further, the formation of impurities from the hydrophobic adhesive, e.g., ASA, which adversely affect the stability of the autoclave, e.g., acidic compounds, in the manufacture of the treated fiber base can be prevented / prevented by adjusting the process conditions, e.g. pass retention.

Thanks to the use of the wet bone adhesive according to the invention, it is also possible to produce paperboard under autoclaving conditions which have different density and porosity characteristics from those of paper made with hydrophobic glue alone. The invention thus provides various alternatives to the ones used now for autoclave packaging material. Can be used e.g. lower density board, 20 i. better stiffness is obtained.

The fiber base autoclave resistance may, if desired, be further improved by adjusting the fiber base structure, e.g., the degree of refinement of the raw material, such as high-consistency grinding; fiber bed web calendering / wet pressing; and / or drying, such as Condebelt drying. Further, the treated fiber base can be supplemented with fillers, such as titanium dioxide, to provide an autoclavable fiber base.

* «· • · • · [[[. The invention further relates to the use of a fiber-based packaging material according to claim 15, wherein the fiber base has been treated with both a wet-bone adhesive and a hydrophobic ···· * t adhesive for use in an autoclave packaging, particularly for the packaging material of the invention.

• ·; .t t Further, using a wet-glue adhesive can be prepared for autoclave conditions

MB of suitable paper and board which performs well in terms of functionality as required for packaging board, eg for further processing processes, packaging and recyclability.

8

The invention will now be described in more detail by way of examples. Example Section

In the examples, the effects of various factors on the raw edge suction of paperboard under autoclaving conditions were investigated.

Autoclave tests were performed on steam-sterilized autoclave using a temperature of about 125 ° C. '' Normal '' autoclaving conditions were performed at about 125'C, 45 min, 100% RH, and '' rough 'at 125 ° C, 60 min, 100% RH. RH = relative humidity. The autoclave treatment also included a temperature raising step (about 15 minutes) and a lowering step (about 20 minutes).

10 During testing, the test samples were coated with a polymer coating on both sides so that only the raw edge was visible from the board. As the raw edge penetration (REP) of autoclave testing, the amount of water absorbed into the board through the sample edges was measured. Infiltration was reported per crude edge area (kg / m2).

The crude edge absorption REP 80 ° C means that the samples were kept in 80'C water for three hours, after which measurement.

SR is the mass drainage resistance according to the Schopper-Riegler method.

··· * t "In the examples and comparative examples of the invention, 150 g / m of cardboard samples were used. Dry birch sulphate pulp (milled to SR for sheet metal refiners * ·· v 1 20 22) using conventional board chemicals used in board production. which was milled: * ·]: with plate refiners SR to 22. The press section was a conventional 3 nipple with both: ***: a semi-felted press section The drying section was conventional with steam cylinders ··· Calendered with a hard nip calender (15 kN / m). For each · · · · · · · · ·, 25 comparative tests, the comparative carton samples were prepared in the same manner so that they differed only in the differences required for comparing the composition or the conditions of manufacture, said differences in sample preparation step i. ** i and / or composition. .

Possible addition of hydrophobic adhesive, Al / Ca compound and wet bone adhesive was carried out: 30 in stock before putting the stock on a wire. Relationships are weight ratios.

! ·· S ··· f · «· * · Φ 9

Examples 1 and 2. Effect of Wet Bond Adhesive (PAAE) on ASA and AKD bonding: In Examples 1 and 2, the carton was mass-glued with two different amounts of hydrophobic adhesive. The amount of wet glue was constant at all test points.

Example 1. Effect of Wet Bond Adhesive (PAAE) on ASA Bonding: 5 "Autoclaving" under "Normal" Conditions Raw Edge Absorption, REP (kg / m2) Low ASA Bonding Level (1 kg / t) 5.7

Low ASA sizing level (1 kg / t) + wet broom sizing (2kg / t) 4.8 Powerful ASA sizing level (3 kg / t) 5.4

Powerful ASA glue level (3 kg / t) + wet glue glue (2 kg / t) 2.7 10

Example 2. Effect of Wet Bone Adhesive (PAAE) on AKD bonding

Autoclaving under '' normal 'conditions Raw edge suction, REP (kg / m2)

Normal AKD bonding level (2 kg / h) 9.6

Normal AKD Bonding Level (2kg / t) + Wet Bonding (2kg / t) 5.0 15 Powerful AKD Bonding (3kg / t) 3.5 ... Powerful AKD Bonding (3kg / t) + Wet Bonding (2kg / t) 2.0 • · From Examples 1 and 2, it can be seen that by using wet adhesive, the amount of hydrophobic adhesive on the board can be reduced.

Example 9: Effectiveness of ASA vs. AKD gluing under autoclave conditions ..... Pulp paperboard was glued with equal amounts of AKD and ASA. The ratio of alumin · ·]] \ hydrophobic glue at both points was 1: 1. The wet-glue to hydrophobic glue ratio was 1: 1. The crude edge absorption was determined under three different experimental conditions: by immersing the carton samples in 80 ° C water (3 h) and by autoclaving under "normal" and "severe" conditions as described above.

Raw edge suction REP (kg / m2) 3 h after 80 º C water treatment 999 ** ·· * AKD bonding (2.5 kg / h) 2.0 10 ASA bonding (2.5 kg / h) 1.4

Autoclave Conditions Normal Hard 5 Raw Edge Absorption (REP) after Autoclaving (kg / m2) AKD Bonding (2.5 kg / h) 2.3 6.2 ASA Bonding (2.5 kg / h) 1.8 2.3 Quantities Absorbed on Cardboard Through the Sample Edges (REP) 10 rations) were quite close to each other on AKD and ASA glued samples under '' normal 'autoclaving conditions. In '' hard '' autoclave conditions, a clearer difference was found in favor of ASA glued board.

Example 4. Effect of the use of alum under autoclave conditions 15

The pulp board was glued with ASA glue (2.5 kg / t) and PAAE wet bone glue (2 kg / t).

.. Autoclave Conditions Hard Normal -

Raw edge absorption (kg / m2) REP REP REPvesi80C

• · ··· v * 20 ASA adhesive: alum ratio 1: 0 9.9 8.1 2.2 ··· • v. ASA adhesive: alum ratio 1: 1 3.8 1.6 1.3 • ·: ***: ASA adhesive: alum ratio 1: 2 2.4 1.6 1.4

The test points clearly show a significant ***** effect of alum reduction in crude edge absorption. Increasing the amount of alum reduced the crude edge absorption under "" severe "* # '25 conditions even after no improvement in crude edge absorption was observed by conventional tests (80 C, 3h) or normal: *** autoclaving conditions.

··· • · • »···. *, Example 5. Effect of milling of whole pulp • Pulp board samples were prepared using pulp milling ratio of 25 SR and, respectively, 30 SR. ASA glue (2.5 kg / t), PAAE resin (2 kg / t) and alum (2 kg / t) were used in the board production.

Autoclave Conditions Hard Normal ---

Raw edge absorption (kg / m2) REP REP REPvesi80C

5 Grinding rate of pulp 25 SR 3.8 1.6 1.3

Pulp refining level 30 SR 2.0 1.6 1.4

Example 6. Part of pulp milled further SR to 80

In the example, low consistency milling was used for the whole pulp and for the longer portion of powder 10. The pulp board samples were prepared using different amounts of pulp having a pulverization rate of 80 SR ("further pulverized pulp"). ASA glue (2.5 kg / t), PAAE (2 kg / t) and alum (2 kg / t) were used to make the board. .

Autoclave conditions tough normal -

Raw edge absorption (kg / m2) REP REP REPvesi80C

15 Proportion of pulp further 0% 3.8 1.6 1.3 • ·: Proportion of pulp 5% 2.7 1.7 1.6 • 9 • • ♦ *

Percentage of pulverized pulp 15% 2.3 1.8 1.4 ♦ ♦ · ero::::: 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. 7. Example 7 nip pressure (15 and 30 kN / m). Compaction could also be done by another type of web compaction method * *: **: (e.g. wet compression, shoe calendering). ASA-: 25 glue (2.5 kg / t), PAAE resin (2 kg / t) and alum (2 kg / t) used in board production.

• · ···

Autoclave conditions tough normal -

: Raw edge absorption (kg / m2) REP REP REPvesi80C

• · · • · · ·

Calendering normal nip pressure 3.8 1.6 1.3 12

Calendering with increased nip pressure 2.8 1.7 1.3

Example 8. Effect of finely divided filler 5 AKD glue (1.5 kg / t) and PAAE resin (1 kg / t) used to make the board.

Normal autoclave conditions -

Raw edge absorption (kg / m2) REP REPvesi80C

Dose of TiO2 0 kg / hr 6.4 1.6

TiO 2 dosage 2 kg / h 3.9 1.5 10 TiO 2 dosage 4 kg / h 3.4 1.5

In pulp board samples, titanium oxide was used as the mineral fines, but other types of fines (e.g. other papermaking fillers) could be used instead.

Example 9. Comparison of autoclave cartons of a condebelt drying machine and a conventional sy-15 cylinder dryer

Autoclave conditions are normal

Raw edge absorption (kg / m2) REP

• ♦ • e ♦ * · * · * Normal drying section 1.4-1.6 ·· «• · · • · · #. ·· *. Condebelt drying section 1.0-1.2 • · ··· • e · '· * 20 The Condebelt drying section is also able to compact the carton structure to withstand more autoclaving conditions.

. · *. The results of the Examples above show that the use of wet-glue adhesive in the manufacture of au-1 "· toclaw board can be compromised by the density and / or porosity of the pulp.

• t • · · • 25 • · • f · * • · «· · ·

·· «I

· · • · • * · ««

Claims (15)

1. Packaging material intended for autoclave packaging comprising an M · V fiber bottom, on whose outer and / or inside there is one or more polymer layers, and wherein the fiber bottom is treated with hydrophobic adhesive, characterized in that the fiber bottom has been treated with hydrogen-rich adhesive, hydrophobic adhesive and an aluminum compound to reduce the packaging's shrimp absorption and that it has been used ··· 0.3-4 kg hydrophobic adhesive per ton of dry fiber bottom, 0.2-12 kg of hydrogen has been used. /. strong adhesive per ton of dry fiber bottom and 0.1-20 kg of aluminum compound has been used • · · * · per ton of dry fiber bottom. • * • *. 30 Packaging material according to claim 1, characterized in that the hydrophobic adhesive contains adhesives consisting of alkenyl succinic anhydride (ASA) * ··· * and / or alkyl chain dimer (AKD). 3, Packaging material according to claim 2, characterized in that the hydrophobic adhesive consists of ASA adhesive. Packaging material according to any one of claims 1-3, characterized in that 0.5-1.7 kg of hydrophobic glue per ton of dry fiber bottom has been used. Packaging material according to any of claims 1-4, characterized in that the wettable adhesive contains polyamidoamine epichlorohydrin resin (PAAE). Packaging material according to any of claims 1-5, characterized in that 1-6 kg of hydrogen-rich adhesive per ton of dry fiber bottom has been used, advantageously 2-4 kg per ton of dry fiber bottom. 10 Packaging material according to any one of claims 1-6, characterized in that 0.5-3 parts by weight of hydrogen-rich adhesive has been used to 1 part by weight of hydrophobic adhesive. Packaging material according to any one of claims 1-7, characterized in that the aluminum compound is an aluminum salt, such as alum or polyaluminium chloride (PAC). 15 Packaging material according to claim 8, characterized in that the weight ratio of the hydrophobic adhesive to the alum is 1: 0.1-1: 7, advantageously 1: 0.5-1: 5, more preferably 1: 1-1: 3rd aa • * ♦ · 10. Packaging material according to claim 8, characterized in that it has added: V: 1.0-10 kg of alum per ton of dry fiber bottom. aaa • · a • a ♦ ». 20 Packaging material according to any one of claims 1-10, characterized in that there is one or more, possibly pigmented polymer layers in the packaging material on the outside and inside. Packaging material according to claim 11, characterized in that the · ···. in the said order, the packing material comprises a polymeric heat sealing layer, a white pigmented polymer layer, a polymer layer containing black pigment, a treated fiber bottom, one or more polymeric oxygen barrier layers, a binder layer, a grip pigmented polymeric light protection layer and a polymeric heat sealing layer. a * • · Packaging material according to any one of claims 1 to 12, characterized in that a filling substance has been added in the fiber bottom layer to increase the autoclave pourability of the package. Packaging material according to claims 1-13, characterized in that the fiber bottom is a packaging paper or a packaging board. 15. Use of packaging material with fiber bottom, in which the fiber bottom is treated with hydrogen-strong adhesive, hydrophobic adhesive and an aluminum compound and 0.3-4 kg hydrophobic adhesive per ton of dry fiber bottom has been used, 0.2-12 kg hydrogen-strong adhesive per ton of dry fiber bottom and 0.1-20 kg of aluminum compound per ton of dry fiber bottom to reduce shrimp absorption in even pressurized conditions at temperature 100-200 ° C in a package to be autoclaved. ·· • 1 »·· • 1 • a · a · a • · • aa • a« aa · • • aa aa · ·· 1 • a · • a ··· • a • · • · * ·· • Aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa