SE458213B - POLYOLEFIN OIL COATED PAPER AND PROCEDURES FOR MANUFACTURING THE PAPER - Google Patents

Description

458 215 These seals for liquid-tight packaging by means of coatings with certain specific polyethylene materials take place between the layers of high-density polyethylene but are then not suitable when the cardboard is to be added to another area of use and wrapped according to other methods. In particular, liquid-tight seals according to DE-A-25 30 477 are not suitable, since temperatures above 90 ° C are required, when a subsequent contour-sharp embossing of the type required in the manufacture of surface-coated cardboard material for organizational purposes, e.g. . in connection with arrangers, ring books, book binders, etc. In this case, the moisture contained in the cardboard would lead to blisters during the embossing without cooling under pressure.

The object and object of the present invention was therefore that. avoid an extra application of adhesive on FMÄEH and / or the foil, nevertheless achieve a good adhesion of the surface putty and that if possible at shorter production times achieve improved properties of the foil and laminate, preferably an improved embossability of the laminate of foil and cardboard. The risk of embrittlement due to loss of plasticizer must be avoided to a large extent. Due to the absence of the use of extra adhesive, the preheating or post-heating of the layers or the adhesive layers can be largely ruled out in order to dry or evaporate the solvent or diluent in the adhesive.

According to the invention, it was determined that these objectives and tasks are fulfilled with a cardboard provided with a polyolefin coating, preferably for organizers, ring books and other organizational and office aids, which on at least one side is provided with two superimposed, thin layers. of an olefin plastic material. The polyolefin coating then consists of a polyolefin combination film of at least two layers, which is applied to at least one side of the cardboard or which surrounds one side of the cardboard completely with at least one strip-shaped or frame-shaped overlap of the cardboard 'on the other side, preferably surrounds the cardboard completely wrapped with a second polyolefin combination film under strip or frame-shaped overlap of the first polyolefin combination film. The polyolefin combination film according to the invention is composed of (A) a melt-adhesive film as the underlying film, consisting of (a) an olefin homo-, copolymer or an olefin homo- resp. 4458 2'3 -3 copolymer mixture, which in total (based on the total plastic mixture for the hot-melt adhesive film) contains 33 - 5% by weight, preferably 30 - 7% by weight, of a polar monomer or polar monomer mixture in the form of the solid or liquid the ke-shaped, monomeric or copolymerized compounds, preferably as polar comonomer (s) with (b) a melting point resp. melting range of 50 to 95 ° C, preferably 60 to 90 ° C, and (c) a density higher than the density of the topsheet, (d) having a melt index of 190 / 2.16 less than 10 g / 10 min. and (B) at least one surface film, consisting of (a) an olefin homo, olefin copolymer, a polar group having olefin copolymer or an olefin homo resp. olefin copolymer mixture, which has (b) a melting point resp. melting range higher than 10,000, preferably higher than 105 ° C, (c) has a melt index 190 / 2.16 less than 10 g / 10 min., (d) a hardness of less than 65 Shore D and (e) a density of 0.89 - 0.93 g / cm3, preferably 0.90 - 0.926 g / cm3, wherein (c) the board without direct use of any adhesive layer is directly connected to the melt adhesive foil or the melt adhesive layer and (a) has a thickness of 0.3 - 5 mm, preferably 1 - 3 mm.

The use or co-use of propylene homo- or copolymer for the surface film results in a density of 0.89 - 0.915 g / cm 3, preferably 0.90 - 0.915 g / cm 3, and a hardness of less than 65 Shore D, so that in total for the upper film (when using propylene and / or ethylene homo- or copolymers) a hardness of less than 65 Shore D, preferably less than 50 Shore D, and a density range of 0 .89 - 0.93 g / cm3, preferably 0.19 - 0.926 g / cm3.

In the case of the polyolefin combination film according to the invention, an extra application of adhesive to the cardboard and / or the foil is thus eliminated. Likewise, no preheating of the adhesive layer is necessary for the evaporation of the diluent in the adhesive. This results in shorter production times. No pre-drying of the cardboard is also required, as the sealing point of the melt-adhesive foil is below the evaporation temperature of the moisture contained in the cardboard. As a result, a good adhesion of the melt foil is obtained on the cardboard and on the surface foil in the joint area. 458 213 = Due to the high viscosity of the melt adhesive layer, the laminate of foil and cardboard can be embossed during laminating without the need for any accelerated cooling with or without the effect of pressure. According to a preferred embodiment, the polyolefin combination film composed of the melt adhesive film (1) and at least one surface film has a thickness of 50 - 400 μm, preferably 80 - 300 μm, and in this case the melt adhesive film has a thickness of 5 - 50 μm. preferably 10 - 30 μm.

According to a preferred embodiment, the polar groups having the olefin copolymer or olefin copolymer mixture consist of or contain at least one ethylene and / or propylene copolymer, a total of 33-5% by weight, preferably 30-7% by weight, of a polar monomer or a polar monomer mixture is included as a comonomer (s) or as polar units in the total plastic material mixture for the melt adhesive films. In this case, the olefin copolymer or olefin copolymer mixture is suitably prepared by copolymerizing the polar monomer or polar monomer mixture with methylene and / or propylene homo- and / or copolymers.

According to another preferred embodiment, the polar group having the olefin copolymer mixture consists of a non-polar groups containing ethylene and / or propylene homo- and / or copolymer and a polar group containing olefin copolymer, preferably polar groups containing ethylene copolymer, prepared by copolymerization with 10 - 70% by weight, preferably 25 - 60% by weight of a polar monomer or polar monomer mixture, with the proviso that a total of 33 - 5% by weight, preferably 30 - 7% by weight , of a polar monomer or a polar monomer mixture are included as comonomer (s) or as polar units' in the total plastic material mixture for the hot melt adhesives.

Furthermore, the melt index (190 / 2.16) of the polyolefin copolymerized with one or more polar monomers and / or the mixture of polyolefins with copolymers with polar monomers in the melt adhesion film is less than 10 g / 10 min. preferably less than 8 g / 10 min.

According to a preferred embodiment, the melt adhesive foil also contains an inorganic filler or an inorganic filler mixture as anti-blocking agent. The surface foil also suitably contains an inorganic filler or an inorganic filler mixture, which preferably serves as a matting agent.

According to a preferred embodiment, per 100 parts by weight of the plastic material or the plastic mixture for the melt adhesive foil and / or the surface foil 0 - 40 parts by weight, preferably 0.5 - 20 parts by weight, of a filler or a filler mixture are used. The filler resp. the filler mixture must be very finely divided.

Per 100 parts by weight of the plastic material resp. the plastic mixture is fed to the melt adhesive foil and / or the surface foil 0.3 - 5 parts by weight, preferably 0.5 - 3 parts by weight, of one or more processing aids.

Since both the surface foil and the melt adhesive foil are plasticizer-poor (plasticizer content below 3% by weight), preferably plasticizer-free, on primary resp. liquid plasticizers, the foils according to the invention have the advantage that a loss of plasticizer cannot occur or can only occur to a very reduced extent.

Within the framework of the present invention, plasticizer-free means that the recipes are free from primary resp. liquid plasticizers or free from other external plasticizers. By softener poor is meant that they have only a very low content of primary resp. liquid plasticizers, for example in connection with recipes that also contain pigments, dyes or fillers.

As with polar monomers copolymerized polyolefins resp. As polar groups containing olefin copolymers, those containing ethylene-vinyl acetate copolymer 458 213 with a vinyl acetate content of 33-5% by weight, preferably 30-7% by weight, and / or alkyl or alkenacrylate, in particular ethylene acrylate, are preferably used. rylate and / or butyl and / or isobutyl acrylate.

These required properties can also be achieved with mixtures of polyolefins and copolymers with a higher proportion of the above-mentioned monomers in such a ratio that the proportion of these monomers in the mixture is 33 - 5% by weight, preferably 30 - 7% by weight.

In addition, in one embodiment, the polyolefin blends or olefin copolymer blends may contain a weight percentage of other plastic materials in amounts up to 15% by weight, preferably up to 10% by weight, for example EPDM (terpolymerized ethylene, propylene and a diene with an unsaturated part of the diene in the side chain), EPM (ethylene-propylene copolymer), etc.

The surface foil suitably consists of polyethylene, preferably high-pressure polyethylene, polypropylene resp. copolymers or mixtures thereof with β-olefin polymers, their modulus of elasticity being less than 4 kp / cm 2, preferably less than 103 kp / cm 2 and their Shore-D hardness being less than 65, preferably less than 50.

The polyolefin composite film composed of the melt-adhesive film or the melt-adhesive layer and at least one surface film is preferably a co-extruded film.

According to a preferred embodiment, the foil is manufactured using a connecting treatment and cooling according to the so-called the chillroll procedure.

The polyolefin composite film composed of the melt adhesive film or the melt adhesive layer and at least one surface film has a modulus of elasticity of less than 104 kp / cm 2, preferably less than 103 kp / cm 2, and a Shore D hardness of less than 65. preferably less than 50.

According to a preferred embodiment, the polyolefin combination film is embossed together with the cardboard. As an organic filler or as an inorganic filler mixture, chalk, talc, silica or glass beads are included in the melt adhesive foil or the melt adhesive layer and / or the surface foil, the average grain size of the filler being less than 40 μm, preferably less than 20 lum.

The invention further relates to a method for the manufacture of cardboard provided with a polyolefin foil, wherein the foil resp. the foils are applied to at least one side of the cardboard, or completely enclosing the cardboard, preferably completely enclosing with a band-shaped overlap.

According to the invention according to the invention for the production of the cardboard provided with a polyolefin film, a polyolefin combination film made of at least two layers is applied completely on one side of the board, with at least one strip-shaped or frame-shaped overlap of the board on the other side, the other side of the tube preferably with a second polyolefin combination film under strip or frame-like overlap of the first polyolefin combination film.

In this case, a polyolefin combination film of at least two layers of a melt-adhesive film, consisting of (a) an olefin homo-, copolymer or olefin homo- resp. copolymer mixture, which in total (based on the total plastic mixture for the hot-melt adhesive film) contains 33 - 5% by weight, preferably 30 - 7% by weight, of a polar monomer or polar monomer mixture in the form of the solid or liquid , the monomeric or copolymerized compounds, preferably as polar comonomer (s), having (b) a melting point or melting range of 50-95 ° C, preferably 60-90 ° C, (c) a density higher than the density of the upper film, i.e. higher than 0.91 - 0.93 g / cm 3, (d) a melt index 190 / 2.16 less than 10 g / 10 min., (B) at least one surface film, consisting of (a) an olefin homo-, olefin copolymer, a polar group having olefin copolymer or an olefin homo resp. olefin copolymer mixture, which (b) has a melting point resp. melting range exceeding 100 ° C, preferably exceeding 105 ° C, (c) has a melt index (190 / 2.16) of less than 10 g / 10 min, on a (C) board without the use of an adhesive 458 213 ~ - layer directly with the melt adhesive foil or the melt adhesive layer. The application or the loading takes place (D) at temperatures of 50 - 95 ° C, preferably 70 - 90 ° C, under the influence of pressure. On the cardboard, the polyolefin combination film with the hot-melt adhesive film or the hot-melt adhesive layer is then immediately applied without any adhesive layer.

According to a preferred embodiment of the method, the paperboard is cut to the desired size and a polyolefin composite film with larger dimensions than for the paperboard is applied to one side of the paperboard covering while maintaining at least one free polyolefin composite film edge strip and then folded around the paperboard so that polyolefin the combination film surrounds the paperboard on the other side of strip or frame-shaped overlapping, preferably with a second polyolefin combination film completely wrapping the cardboard under strip or frame-shaped overlap of the first polyolefin combination film.

The cardboard is added after completion of the desired, e.g. rectangular or square piece either directly for further processing or subjected to stacking and / or storage in a magazine. The polyolefin combination foil is cut to the desired dimensions in the book covering machine, preferably wound on a roll. The folding down of the free polyolefin combination strip protruding above the cardboard takes place by means of mechanical devices or methods, preferably using brushes.

The casing is preferably done with the aid of embossed plates and / or rollers.

When pressing with the help of plates, the press pressure amounts to 0.3 - 5 kp / cm¿, during roll lashing the line pressure is 3 - 30 kp / cm¿.

The heat exposure time is regulated to 0.5 - S s.

Additional measures for fixing the embossing are not necessary in the method according to the invention.

The cardboard then has a thickness of 0.5 - 5 mm, preferably 1-3 mm. 458 213 According to a treaty procedure, the heat is transferred through permanently heated plates or rollers to the layers resp. foils to be bonded together.

In this case, these plates emboss or roll the laminate without using extra measures for fixing the embossing.

Embodiment Example 1 Coextruded (fSlie, in which the upper film consists of polypropylene (ELTEX PKS 404 - registered trademark of Solvay & Cie) and the lower film of a polar group containing olefin copolymer mixture, containing 9% by weight of a mixture high molecular weight acrylic esters and a polyethylene, the thickness of the upper film is 120 μm and the thickness of the adhesive layer is 30 μm.

Sealing temperature 90oC Welding strength 6 N / 15 mm Sealing time 3 s.

Adhesion to cardboard indistinguishable; delamination of the board at increased load in the tensile test Example 2 Coextruded film based on polyolefin, in which the upper film consists of high-pressure polyethylene (LDPE 1013 from BASF) and the underlying film consists of a polar group having copolymers of ethylene with ethylene vinyl acetate (EVA content 30% by weight).

Sealing temperature 90oC welding needle strength 2.5 N / 15 mm Sealing time 3 S..

Adhesion to cardboard tearing of the cardboard under increased load in the tensile test 458 213 10 Example 3 upper film of linear-low-density polyethylene, "base film of mixing a polar group containing copolymer mixture of ethylene with ethylene vinyl acetate, consisting of 50 parts by weight with a vinyl acetate content of 20% by weight and 50 parts by weight with a vinyl acetate content of 30% by weight.

Sealing temperature 88 ° C Welding strength 1.2 N / 15 mm Sealing time 3.5 s.

Adhesion to cardboard Partial tear of the cardboard at increased load in the tensile test Example 4 Upper film of 50 parts by weight of linear high pressure polyethylene and 50 parts by weight of a polar group containing ethylene copolymer with an ethylene-vinyl acetate content of 30% by weight and the underlying film of 100 parts by weight of a polar group having ethylene copolymer with an ethylene-vinyl acetate content of 30% by weight.

Sealing temperature 9206 Welding strength 3.2 N / 15 mm Sealing time 2.8 s.

Adhesion to cardboard tearing of the cardboard at increased load in the tensile test Examples 5 - 8 Upper foil according to examples 1 - 4. In addition, the plastic material resp. to the plastic material mixture in the lower foil 0.5 - 3% by weight of filler as anti-blocking agent. At 3 s. Sealing time and 90 ° C sealing temperature, adhesions of 2.5 - 3.5 N / 15 mm were measured. In all the adhesion tests, a cardboard tear resulted in increased loading in the tensile test.

Examples 9 - 12 Underlying film according to examples 1 - 4 (also 5 - 8). In addition, 0.5 - 3% by weight of filler was added to the upper foil as anti-blocking agent. These correspond to the respective examples 1 - 4 (without filler additive) resp. examples 5 - 8.

Example 13 Lower film according to Example 2. Upper film as Example 2, but also 7 parts by weight of EPDM (terpolymer of ethylene, propylene and a diene with an unsaturated part in the diene in the side chain) to control the gloss of the film.

Sealing temperature 87oC Sealing time 2 s.

Adhesion to the board Partial delamination of the board in the adhesion test Example 14 Coextruded film, in which the upper film consisted of high-pressure polyethylene and the underlying film of a mixture of 60 parts by weight of linear high-pressure polyethylene and 40 parts by weight of polar groups containing ethylene-amyl vinyl acetate 60 parts by weight of vinyl acetate content.

Hardness 48 Shore D Sealing temperature 94 ° C Sealing time 2.5 s.

Adhesion to cardboard tearing of the cardboard at increased load in the tensile test The accompanying drawing schematically shows a cardboard provided with a polyolefin coating for organizers, ring books or similar organizational and office aids.

The reference numeral (1) indicates the melt adhesive foil as the underlying foil, which together with the surface foil (2) is manufactured in the co-extrusion process. The cardboard (3) cut to the desired size is surrounded by the combination foil consisting of the melt-adhesive foil (1) and the upper foil (2) in such a way that a polyolefin is applied to the lower side of the cardboard (3). 12 fine combination foil with larger dimensions than the cardboard while maintaining at least one free polyolefin combination foil edge strip and then folding up around the cardboard, so that the polyolefin combination foil provides the cardboard fl on the upper side with a strip or frame-shaped overlap (4) . According to a preferred embodiment, a second polyolefin combination film is applied to the top of the paperboard under strip or frame-shaped overlap (5) of the first polyolefin combination film overlap.

Claims (13)

10 15 20 25 30 '458 213 15 Patent claims 1. Cardboard coated with a polyolefin coating. preferably for organizers. ring books and other organizational and office aids, which on at least one surface are provided with two arranged one above the other. thin layers of an olefin plastic material, characterized in that the polyolefin coating consists of a polyolefin combination film made up of at least two layers. which is applied to at least one side of the cardboard or which, in each layer, has a different density. n e t e c k n a d gives one side of the cardboard comprehensive with at least one band-shaped or frame-shaped overlap of the cardboard on the other side. preferably the paperboard is completely enveloped with a second polyolefin composite film during strip or frame-like overlapping of the first polyolefin composite film. and the polyolefin combination film is composed of A. a melt adhesive film as the underlying film. consisting of a a olefin homo-. copolymer or an olefin homo- resp. copolymer mixture. which in total (calculated on the total plastic material mixture for the hot-melt adhesive film) contains 33 - 5 wt., preferably 30 - 7 wt. of a polar monomer or polar monomer mixture in the form of the solid or liquid form. monomeric or copolymerized compound (s), preferably as polar co-monomer (s). with h a melting point resp. melting range of 50 - 95 ° C, preferably 60 - 90 ° C. and c a density. which is higher than the density of the upper film and a melt index 190 / 2.16 less than 10 g / 10 min, and B. at least one surface film, consisting of a an olefin homo-. olefin copolymer. a polar group having olefin copolymer or an olefin homo- resp. olefin copolymer mixture, which has a melting point or melting range exceeding 100 ° C, preferably above 105 ° C. c a melt index 190 / 2.16 less than 10 g / 10 min. d has a hardness of less than 65 Share D, preferably less than S0 Shore D, and has. 3 N _ _ e a density of 0.89 - 0.93 g / cm. preferably 0.90 - 0.926 g / cm, C. wherein the cardboard without co-use of an adhesive layer is in direct communication with the melt adhesive foil or the melt adhesive layer and has a thickness of 0.3 - 5 mm. preferably 1-3 mm. 2. A board provided with a polyolefin foil according to claim 1, characterized in that the polyolefin combination foil composed of the melt-adhesive foil (1) and at least one surface foil (2) has a thickness of 50 - 400 μm, preferably 80 - 300 um. wherein the melt adhesive foil resp. the melt adhesion layer has a thickness of 5 - S0 μm. preferably 10 - 30 μm. Polyolefin foil paperboard according to claims 1 and 2. It is claimed that the polar group having the olefin copolymer or the olefin copolymer mixture comprises or contains at least one ethylene and / or propylene copolymer and has a total weight of 33 to 5. preferably 30 - 7 weights. of a polar monomer or a polar monomer mixture is included as a comonomer (s) or as polar units in the total plastic material mixture for the hot melt adhesive films_ Polyolefin foil paperboard according to claims 1 and 2. characterized in that the polar groups having olefin copolymer mixture consist of a non-polar groups containing ethylene and / or propylene homo- and / or copolymer and a polar group containing olefin copolymer. preferably polar groups containing ethylene copolymer. which is prepared by copolymerization with 10 - 70 weight. preferably 25 - 60 weight. of a polar monomer or polar monomer mixture. with the proviso that a total of 33 - 5 víktï. preferably 30 - 7 weight. of a polar monomer or a polar monomer mixture is included as a comonomer (s) or as polar units in the total plastic material mixture for the melt adhesive films. Polyolefin foil board according to one or more of Claims 1 to 4, characterized in that the melt index (190 / 2.16) of the polyolefin copolymerized with one or more polar monomers and / or the mixture of polyolefins and olein copolymers with polar monomers in the hot-melt adhesive film is less than B g / 10 min. Cardboard provided with polyolefin foil according to one or more of Claims 1 to 5, characterized in that the surface foil contains an inorganic filler or an inorganic filler mixture. 10 15 20 25 30 35 'lay Heated polyolefin foil provided with cardboard according to one or more of claims 1 - 6. characterized in that the surface foil consists of polyethylene, polypropylene. their copolymers or mixtures with α-olefin polymers. whose modulus of elasticity is less than 104 kp / cm 2, preferably less than 103 kp / cm 2 and whose Shore D hardness is less than 65. preferably less than 50. Cardboard provided with polyolefin foil according to one or more of Claims 1 to 7, characterized in that the polyolefin combination foil is embossed. preferably is embossed together with the cardboard. 9. Procedure for the manufacture of cardboard seen. wherein the foil is applied to the pen. characterized in that a built-up polyolefin combination foil a polyolefin foil at least one side of the cardboard or at least of two layers is applied to one side of the cardboard completely. with at least one strip-shaped or frame-shaped overlap of the cardboard on the other side and that preferably the other side of the cardboard is covered with a second polyolefin combination film. during strip or frame-like overlap of the first polyolefin combination film. further that the polyolefin combination film of A. is a melt-adhesive film. consisting of an olefin homo-, copolymer or olefin homo- resp. copolymer mixture. which in total (calculated on the total plastic material mixture for the hot-melt adhesive film) contains 33 - 5 weights, preferably 30 - 7 weights. of a polar monomer or polar monomer mixture in the form of the solid or liquid ones. monomeric or copolymerized compounds, preferably in the form of polar comonomers (polar comonomer). with b a melting point resp. melting range of 50 - 95 ° C. preferably 60 - 90 ° C. 10. 15 20 25 30 35 4.58 215 17 a density. which is higher than the density of the upper foil. i.e. higher than 0.91 - 0.93 g / cml. a melt index 190 / 2.16 less than 10 g / 10 min, at least one surface film, consisting of an olefin homo- or olefin copolymer. which has a melting point resp. melting range exceeding 100 ° C. preferably above 10 ° C, has a melt index of 190 / 2.16 for 10 g / 10 min. wherein the polyolefin combination film with the hot foil layer is applied directly to the cardboard without the use of any adhesive layer and the cardboard has a thickness of 0.5 - 5 mm. preferably 1-3 mm. that the application and handling procedure takes place by a casing at temperatures of 50 - 95 ° C. preferably 70 - 90 ° C, and under the influence of pressure. lo. Method according to Claim 9. Characterized by the fact that when pressing by means of plates, the pressing pressure amounts to 0.3 - 5 kp / cm 2, while the line pressure amounts to 3 - 20 kp / cm when rolling. 11. ll. Method according to claims 9 and 10. characterized in that the heat action time is 0.5 - 5 S. p 10 15 458 213 _ fe Method according to one or more of claims 9 - 11. FEATURES The heat is transferred through permanently heated plates or rollers on the layers resp. foils to be bound together. Method according to one or more of Claims 9 to 12, characterized in that the cardboard is cut to the desired size and in that a polyolefin combination film with larger dimensions than in the cardboard is applied to one side of the cardboard completely while maintaining at least one free polyolefin combination foil edge strip and then folds up around the cardboard. so that the polyolefin combination foil surrounds the cardboard on the other side in a strip or frame-like overlapping manner. preferably with a second polyolefin combination film completely wrapping the cardboard during strip or frame-like overlapping of the first polyolefin combination film.