METHOD FOR PRODUCE A PRINTED DETERGENT TABLET

Description

[0001] The present invention relates to a method for producing printed detergent tablets. In particular, the present invention relates to printed detergent tablets in a shrink-wrapped film package, detergent packaging comprising these detergent tablets, and washing and cleaning methods using these detergent tablets.

[0002] The packaging and distribution of detergents and cleaning agents are constantly evolving. For some time now, a key focus has been on convenient dosing of detergents and cleaning agents by the consumer and simplifying the steps required to carry out a washing or cleaning process. One technical solution is offered by pre-portioned detergents or cleaning agents, for example, water-soluble containers with one or more compartments for powdered or liquid detergents or cleaning agents. Another technical solution is detergent tablets, which can be designed as single- or multi-phase products. WO 01 / 44432 A1 discloses a detergent tablet whose surface is printed using the inkjet printing process, wherein the printed tablet is packaged in a closed package.

[0003] Like water-soluble containers, detergent tablets are typically coated with film materials. In the case of detergent tablets, however, these coatings can be either water-soluble or water-insoluble. The water-insoluble film packaging must be removed by the consumer before the detergent tablet is used. Both water-soluble and water-insoluble film packaging offer manufacturers of corresponding dosage units the opportunity to imprint detergents or cleaning agents with information such as product names, product information, company names, or advertising messages and symbols. In an alternative approach, the imprints are applied not to the outer packaging of the tablets, but to the tablets themselves, before they are packaged with a preferably transparent water-soluble or water-insoluble film material.While prints on packaging films can become distorted or deteriorate in quality during the packaging process, as is the case, for example, with the shrink-wrapping of printed packaging films onto detergent tablets, prints applied to the tablet surface pass through the packaging process without any adverse effects. Direct tablet printing, however, has the disadvantage that, in highly efficient processes with short processing times, the printing ink applied to the tablet surface can bleed onto the inside of the applied packaging film in the subsequent packaging step.

[0004] Against the background of the previously described prior art, the object of the application was to provide a process for producing detergent portion units which have a high product and storage stability, can be easily assembled using minimal amounts of packaging materials and can be produced efficiently.

[0005] To achieve these objects, a process according to the present claims is suitable for producing a printed detergent tablet, comprising a) at least one phase consisting of a compressed particulate premix, b) a print on the surface of the detergent tablet with a print resolution of 40 to 300 dpi, c) a film packaging shrunk onto the detergent tablet, which at least partially covers the print.

[0006] Surprisingly, it has been shown that when shrink-wrapping a film package onto the tablets, the stability and optical quality of a print applied to the tablet surface is influenced by its print resolution.

[0007] The printed detergent tablets comprise at least one phase. A phase is defined as a macroscopic region of the detergent tablet, which preferably comprises at least 5 vol.%, more preferably at least 15 vol.%, and in particular at least 25 vol.% of the detergent tablet. Examples of phases are tablet layers.

[0008] In a first embodiment, the detergent tablet has only one phase. Detergent tablets with a single phase have side surfaces with identical surface properties. In these cases, alignment of the detergent tablet after tableting and before printing, for example, to avoid undesirable interactions between the printing and ingredients, ink, or surface roughness of a side surface, is not necessary. Corresponding manufacturing processes are therefore less complex and more efficient.

[0009] In a second embodiment, the detergent tablet has two or more layers. While tablet production tends to become more complex with increasing number of layers, a tablet design with two or more layers simultaneously expands the degrees of freedom with regard to the color design of the tablet. For example, it is possible to produce detergent tablets with differently colored layers.

[0010] Surprisingly, it has been shown that both the particle size distribution of the particulate premix used to produce the tablet and the whiteness of the tablets produced from this premix influence the perceptibility and durability of the print. With regard to the particle size distribution, both the absolute size of the particles and the weight fraction of particles of a certain size are influential.

[0011] For the reasons stated above, it is therefore preferred that the particulate premixture has a particle size distribution in which at least 70% by weight of the particles, preferably at least 80% by weight of the particles, have a particle size between 100 µm and 1000 µm. It is further preferred that the particulate premixture has a particle size distribution in which at least 50% by weight of the particles have a particle size between 200 µm and 800 µm, preferably between 250 µm and 750 µm.

[0012] Good printing results were observed for particulate premixes with a bimodal particle size distribution with maxima in the range between 100 µm and 900 µm.

[0013] Good printing results were observed for particulate premixes with a bimodal particle size distribution with maxima in the range between 50 µm and 600 µm.

[0014] In a preferred embodiment, the detergent tablet has two layered phases which differ in terms of their average particle size D50, wherein the layer with the smaller average particle size D50 has a print.

[0015] The whiteness of the tablet surface has proven to be particularly relevant for the perceptibility and legibility of the print.

[0016] For this reason, detergent tablets are preferred in which at least 90%, preferably at least 95% and in particular at least 98% of the surface of the printed phase outside the printed area has a degree of whiteness which is defined by L* max is in the range from 85 to 100, a* max is in the range from -3 to +5 b* max is in the range from +5 to -15.

[0017] Further preferred are detergent tablets, wherein at least 90%, preferably at least 95% and in particular at least 98% of the surface of the printed phase outside the printed area has a degree of whiteness which is defined by L* max is in the range from 95 to 100, a* max is in the range from -1 to +2 b* max is in the range from +2 to -4.

[0018] Particularly preferred are detergent tablets wherein at least 90%, preferably at least 95% and in particular at least 98% of the surface of the printed phase outside the printed area has a degree of whiteness which is defined by L* max is in the range from 98 to 100, a* max is in the range from -1 to +1 b* max is in the range from +1 to -11.

[0019] Very particular preference is given to detergent tablets wherein at least 90%, preferably at least 95% and in particular at least 98% of the surface of the printed phase outside the printed area has a degree of whiteness which is defined by L* max is in the range of 99 to 100, a* max is in the range of 0 b* max is in the range of 0.

[0020] In a further preferred embodiment, the detergent tablet has two layers which differ in their degree of whiteness and the layer with the higher degree of whiteness has a print.

[0021] With regard to the technical realization of the degree of whiteness, the specialist has a number of different procedures at his disposal, which can be used alone or in combination to adjust the degree of whiteness.

[0022] These technical measures include, for example, the use of preferably particulate components with suitable whiteness; the use of pigments, in particular white pigments; the selection of a suitable particle size and particle size distribution of the premix to be tableted; the selection of a suitable compression pressure for tabletting the particulate premix; the setting of a suitable surface roughness of the outer surface of the tablet

[0023] The group of preferred components of the particulate premix due to their whiteness includes, in particular, inorganic and organic salts. The group of preferred inorganic salts includes, in particular, sodium carbonate, sodium percarbonate, sodium bicarbonate, sodium sulfate, sodium silicate, and zeolite. A preferred organic salt is sodium citrate. Urea is also preferred.

[0024] Preferred particulate premixes comprise, based on their total weight, substances from the group sodium carbonate, sodium percarbonate, sodium bicarbonate, sodium sulfate, sodium silicate, zeolite, sodium citrate and urea in amounts above 40 wt.%, preferably above 50 wt.% and in particular from 55 to 70 wt.%.

[0025] Pigments that can be used to improve the whiteness of the tablet surface include calcium carbonate, titanium dioxide, which may be present in rutile or anatase crystal modification, zinc oxide, zinc sulfide, white lead (basic lead carbonate), barium sulfate, aluminum hydroxide, antimony oxide, lithopone (zinc sulfide barium sulfate), kaolin, chalk, talc, and / or mica. Titanium dioxide, which may be present in rutile or anatase crystal modification, is particularly preferred. The average particle size of such pigments is typically in the range of 0.004 µm to 50 µm. The use of pigments surface-modified with dispersants is also possible. Preferably, titanium dioxide pigment surface-modified with Al, Si, Zr or polyol compounds, in particular in rutile form, as sold, for example, under the trade names Kronos ®< 2132 (Kronos-Titan) or Hombitan ®< R 522 (Sachtleben Chemie GmbH), is used.The Tiona ®< RLL, AG and VC types from Solvay as well as the Bayertitan ®< RD, R-KB and AZ types from Bayer AG are also suitable.

[0026] Another group of suitable white pigments is formed by stearates, particularly calcium stearate, magnesium stearate, strontium stearate, and talc. Like the aforementioned white pigments, these white pigments can also be added to the particulate premix before tabletting. Alternatively, however, it is also possible to apply the white pigments, particularly the stearates, to the tablet surface during or after tabletting. This can be achieved, for example, by applying the stearate to the punch surface, whereby the stearate is transferred to the tablet surface during tabletting, or by powdering or coating the tablet surface after tabletting. Talc and magnesium stearate are particularly preferred as coating or powdering agents.

[0027] The above-described white pigments are preferably used in amounts of 0.001 to 0.8 wt.%, particularly preferably 0.01 to 0.6 wt.%, based on the total weight of the particulate premix. These white pigments are particularly preferred for use in detergent tablets containing washing or cleaning enzymes, since these enzymes can cause undesirable discoloration of the detergent tablet surface. The white pigments can be added to the particulate premix as an integral component of the enzyme granules or as a separate active ingredient.

[0028] The particle size distribution of the particulate premix, in which at least 60 wt.% of the particles have a particle size between 100 µm and 900 µm, also has a beneficial effect on the whiteness of the tablet while maintaining sufficient tablet integrity. While larger particles generally reduce the whiteness at a given tableting pressure, the use of smaller particles increases abrasion during production and transport.

[0029] In terms of the technical implementation of the printing process and the durability of the resulting print images, printing with an inkjet printer has proven particularly advantageous. The print resolution is 40 to 260 dpi, and in particular 120 and 260 dpi.

[0030] The surface of the printed phase is preferably printed at 10% to 60%, especially 20% to 45%. Print motifs with curved contours have proven particularly suitable.

[0031] A printed detergent tablet according to any one of the preceding points, wherein the printing covers 10% to 60%, preferably 20% to 45%, of the printed phase. The printing is preferably completely covered by the shrink-wrapped film packaging.

[0032] For reasons of better perceptibility and recognizability, the printed surface and the surface of the printed phase outside the printed area preferably have a color difference ΔE above 20, particularly preferably above 40 and in particular above 60.

[0033] Furthermore, an average roughness of at least one outer surface of the tablet of 25 µm to 500 µm, preferably 50 µm to 300 µm, has proven advantageous for printability. Roughness describes the deviation of a real surface from an ideally smooth surface and is determined, for example, using confocal laser scanning microscopy. The printed area of ​​the detergent tablet preferably has an average roughness of 25 µm to 500 µm, preferably 50 µm to 300 µm. The roughness values ​​preferred according to the invention reduce abrasion of the shaped bodies during production and transport and have a beneficial effect on the durability of the print.

[0034] The detergent tablets are preferably obtained by tabletting the particulate premixes using low compression pressures. These low compression pressures correlate with tablet hardnesses of preferably 50 N to 300 N, and in particular 70 N to 200 N. The hardness of the tablets is measured by deforming the tablet until it breaks, whereby the force acts on the side surfaces of the tablet and the maximum force the tablet can withstand is determined. A tablet testing device from Sotax, for example, is suitable for determining tablet hardness. Although, for a given premix, the use of higher compression pressures generally results in a higher degree of whiteness of the tablet surface due to the resulting smoother tablet surface, these high compression pressures undesirably impair tablet disintegration due to the increased tablet hardness.The above-mentioned tablet hardnesses of preferably 50 N to 300 N and in particular 70 N to 200 N are accompanied by a sufficiently rapid tablet disintegration and, at the same time, an advantageous degree of whiteness.

[0035] Detergent tablets are used both for textile washing and for cleaning hard surfaces such as ceramic, glass, metal, or tiles. The detergent tablets preferably weigh between 14 g and 42 g, preferably between 20 g and 38 g, and especially between 24 g and 34 g.

[0036] Preferred detergent tablets are cuboid-shaped. Cuboid-shaped detergent tablets comprise a bottom side, a top side, and a shell surface connecting the bottom and top sides. For tablet stability, it has also proven advantageous if the edges bordering the bottom and top sides are chamfered. To increase the stability of the tablets, it may also be advisable to round the edges of the shell surfaces connecting the bottom and top sides.

[0037] The density of preferred detergent tablets is 1.1 g / cm 3 to 1.5 g / cm 3 , preferably 1.15 g / cm 3 to 1.3 g / cm 3 . As a consequence of the high tablet density and the high fill level, the detergent formulations according to the invention described further below have comparatively high densities, for example densities in the range from 0.9 g / cm 3 to 1.4 g / cm 3 , preferably in the range from 1.05 g / cm 3 to 1.3 g / cm 3 .

[0038] The incorporation of specific active ingredients into the detergent tablet has proven advantageous for the sharpness of the contours and durability of the printed image. For this reason, detergent tablets are preferred which contain at least one active ingredient from the group of builders, in particular at least one active ingredient from the group of zeolites, silicates, and carbonates, preferably from the group of zeolites. The weight fraction of these active ingredients in the total weight of the detergent tablet is preferably 5 to 60 wt.%, in particular 10 to 50 wt. Detergent tablets which, based on their total weight, contain 5 to 60 wt.%, in particular 10 to 50 wt.% of zeolite are particularly preferred.

[0039] For the sharpness of the contours and durability of the printed image, the use of active ingredients from the group of celluloses and cellulose derivatives, preferably from the group of celluloses, microcrystalline celluloses, and carboxymethylcelluloses, is also advantageous. The weight proportion of these cellulose-based active ingredients to the total weight of the detergent tablet is preferably 2 to 50% by weight.

[0040] To improve the print quality, preferred detergent tablets contain less than 10% by weight, preferably less than 5% by weight, and in particular less than 1% by weight of an organic acid, based on their total weight. Organic acids are those active ingredients that are contained in the detergent tablets in acid form, i.e., not in the form of their salt.

[0041] With regard to the stability of the printed image, in particular to reduce ink transfer from the printed tablet to the surrounding shrink wrap, it has proven advantageous if the detergent tablet, based on its total weight, comprises less than 10 wt.%, preferably less than 2 wt.%, and in particular no binder from the group of polyethylene glycols. Corresponding detergent tablets are preferred.

[0042] The shrink-fit film packaging preferably consists of a water-soluble film material. The water-soluble film material can comprise one or more structurally different water-soluble polymers. Particularly suitable water-soluble polymers are polymers from the group of (optionally acetalized) polyvinyl alcohols (PVAL) and their copolymers. The shrink-fit film packaging preferably consists of at least 40 wt.%, preferably at least 60 wt.%, and in particular at least 80 wt.% polyvinyl alcohol.

[0043] The shrink-wrapped film packaging is preferably transparent.

[0044] Water-soluble film materials are preferably based on a polyvinyl alcohol or a polyvinyl alcohol copolymer whose molecular weight is in the range from 10,000 to 1,000,000 gmol -1< , preferably from 20,000 to 500,000 gmol -1< , particularly preferably from 30,000 to 100,000 gmol -1< and in particular from 40,000 to 80,000 gmol -1<.

[0045] The production of polyvinyl alcohol and polyvinyl alcohol copolymers generally involves the hydrolysis of intermediate polyvinyl acetate. Preferred polyvinyl alcohols and polyvinyl alcohol copolymers have a degree of hydrolysis of 70 to 100 mol%, preferably 80 to 90 mol%, particularly preferably 81 to 89 mol%, and especially 82 to 88 mol%.

[0046] Preferred polyvinyl alcohol copolymers comprise, in addition to vinyl alcohol, an ethylenically unsaturated carboxylic acid, its salt, or its ester. Particularly preferably, such polyvinyl alcohol copolymers contain, in addition to vinyl alcohol, sulfonic acids such as 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS), acrylic acid, methacrylic acid, acrylic acid esters, methacrylic acid esters, or mixtures thereof.

[0047] For further packaging of the printed and shrink-wrapped detergent tablets, all packaging materials known to those skilled in the art in this field, such as cardboard packaging or stand-up pouches, are generally suitable.

[0048] In a preferred embodiment, the outer packaging is carried out by means of a folding box. Particularly preferred is a detergent packaging comprising a) washing detergent tablets with a printed phase according to one of items 1 to 35, b) an outer packaging in the form of a folding box, with a base surface, a lid surface and side walls connecting the base surface and the lid surface, wherein i) the outer packaging has a fill level of 85 vol.% to 99 vol.% and ii) the outer packaging contains at least two washing tablets which are arranged in a sorted manner in the outer packaging.

[0049] The outer packaging is preferably designed as a one-piece folding box. Preferred outer packagings have a flat base whose largest diagonal is greater than the height of the outer packaging. This design of the outer packaging increases its stability and enables easy opening and removal. It is particularly preferred if the outer packaging has a flat base whose largest diagonal is more than twice, preferably more than four times, the height of the outer packaging.

[0050] To achieve the high fill level, it has proven advantageous for the outer packaging to have a square base, preferably a square base, and most preferably a rectangular base. For the same reason, and to improve the stackability of the outer packaging, it is preferred for the outer packaging to have a lid surface that is plane-parallel to the base. Rectangular outer packaging is particularly preferred.

[0051] To increase storage stability, especially for chemical stabilization of detergent tablets, it has proven advantageous for the outer packaging to be resealable. Suitable closure elements include adhesive, locking, snap-on, or plug-in elements, with adhesive and plug-in elements being particularly preferred. Examples of closure elements include push-in closures or removable adhesive closures.

[0052] For sustainability reasons, recycled and / or recyclable materials are preferred for the production of the outer packaging. Preferably, the packaging materials are based on renewable raw materials. The use of packaging materials based on pulp and recycled paper is particularly preferred.

[0053] In a first preferred embodiment, the outer packaging is made of cardboard. The advantages of cardboard, in addition to its availability and recyclability, lie in the wide variety of available types and weights. Preferred cardboards have a weight of 150 to 400 g / m².

[0054] Corrugated cardboard, which has proven to be technically superior to cartonboard in some respects, is used in a particularly preferred embodiment for the production of outer packaging. Corrugated cardboard is characterized by high strength despite its low weight and is a suitable medium for storage and transport, even in large containers.

[0055] In a particularly preferred embodiment, the outer packaging is designed as a hinged lid box.

[0056] A key feature of the detergent packaging is its high fill level of 85 to 99 vol.% of the outer packaging. This high fill level not only reduces the amount of packaging material required per detergent tablet, but also surprisingly increases the physical stability of the detergent tablets, both with regard to tablet breakage and tablet abrasion, as well as the durability of the printing. The fill level of preferred outer packaging is 88 vol.% and 99 vol.%, preferably 92 vol.% and 99 vol.%. The "fill level" refers to the proportion of the internal volume of the outer packaging occupied by the detergent tablets contained in the outer packaging.

[0057] In order to reduce the packaging proportion per detergent tablet, it is preferred if the detergent packaging comprises at least ten, preferably at least twenty, particularly preferably at least thirty detergent tablets, which are arranged in a sorted manner in the outer packaging.

[0058] When integrating a larger number of detergent tablets into the detergent packaging, their stability can be further improved by a targeted arrangement of the tablets. Detergent packagings have proven advantageous that comprise at least ten, preferably at least twenty, particularly preferably at least thirty detergent tablets, which are arranged in the outer packaging in such a way that each of the detergent tablets is in direct contact with at least three other detergent tablets.

[0059] The invention relates to a process for producing a printed detergent tablet as described above, comprising the steps a) Providing a particulate premix, b) Compressing the particulate premix to form a detergent tablet having at least one phase, c) Printing the surface of the detergent tablet with a print resolution of between 40 and 260 dpi, d) Transporting the printed detergent tablet into a packaging machine, e) Wrapping the printed tablet in a film package and shrinking the film package such that the shrunk-on film package covers the printing at least partially, preferably completely.

[0060] The preferred embodiments described with regard to the printed detergent tablet apply to the process mutatis mutandis. To avoid repetition, reference is made to the explanations therein.

[0061] According to the invention, the particulate premix is ​​compressed in step b) at a pressure above 1 kN / cm², preferably at a pressure of 1 kN / cm² to 3 kN / cm². Such pressures have surprisingly proven advantageous with regard to the stability of the printed image. Due to the simultaneously improved disintegration behavior, pressures of 1 kN / cm² to 2.5 kN / cm² are particularly preferred.

[0062] In order to reduce or completely avoid ink transfer from the printed tablet surface to the surrounding shrink wrap while simultaneously conducting the process efficiently, it has proven advantageous if the time period between the end of printing in step c) and the wrapping of the printed tablet in step e) is less than 180 seconds, preferably between 1 and 120 seconds, preferably between 1 and 10 seconds and in particular between 1 and 5 seconds.

[0063] In step e), the film packaging is preferably heat-treated using an air stream with a temperature between 180°C and 650°C and subsequently shrunk onto the tablet.

[0064] As stated above, the detergent tablets are suitable for cleaning textiles as well as hard surfaces. Further subject matter of the application are therefore processes for textile care or textile cleaning, in which a printed detergent tablet according to the invention is introduced into the dosing chamber or the washing drum of a textile washing machine, and processes for dishwashing, in which a printed detergent tablet according to the invention is introduced into the dosing chamber or the interior of a dishwasher. Preferred washing or cleaning processes are carried out at bath temperatures below 40°C. Example

[0065] Particulate premixes with the composition listed in the table below were compressed into single-phase tablets in a tablet press with compression forces of 10, 20, and 30 kN (values ​​in wt.% based on the particulate premix). The surface area of ​​the tablet exposed to compression pressure was 16.75 cm². 80 wt.% of the particles in the particulate premix had a particle size between 100 µm and 1000 µm. 1 2 3 Anionic surfactant 18 18 18 Soap 0,4 0,4 0,4 Nonionic surfactant 1,0 1,0 1,0 Sodium carbonate 18 18 18 Sodium percarbonate 15 15 15 Sodium bicarbonate 15 15 10 Sodium silicate 3,2 3,2 3,2 Sodium sulfate 8,6 6,6 3,6 Sodium citrate 4,0 4,0 4,0 Polyethylene glycol -- 2,0 10 detergent polymers 3,2 3,2 3,2 Tablet disintegrant (cellulose) 7,5 7,5 7,5 Water and other components Ad 100 Ad 100 Ad 100

[0066] The detergent tablets were printed with a print resolution of 150, 300 and 600 dpi in an area of ​​30% of their surface.

[0067] Following printing, the printed tablets were wrapped in a water-soluble polyvinyl alcohol film at intervals of 1 second, 10 seconds, or 120 seconds. The film was then pressed onto the tablet.

[0068] The color transfer from the tablet surface to the inside of the shrink-fit film was determined. The results were categorized as follows: 0 = no color transfer 1 = slight color transfer 2 = significant color transfer

[0069] The results of the color transfer determination are summarized in the following table: 150 dpi 300 dpi 600 dpi 1 sec 10 seconds 2 minutes 1 sec 10 seconds 2 minutes 1 sec 10 seconds 2 minutes 0% PEG 10 kN 1 0 0 2 1 0 2 2 0 20 kN 0 0 0 2 1 0 2 2 0 30 kN 0 0 0 2 0 0 2 2 0 2% PEG 10 kN 1 1 0 2 1 0 2 2 0 20 kN 0 0 0 2 1 0 2 1 0 30 kN 0 0 0 2 1 0 2 2 0 10% PEG 10 kN 1 1 0 2 1 0 2 2 1 20 kN 0 0 0 2 1 0 2 2 1 30 kN 0 0 0 2 1 0 2 2 0

Claims

1. A process for the manufacture of a printed detergent tablet comprising a) at least one phase from a compressed particulate premix, b) printing on the surface of the detergent tablet with a print resolution of between 40 and 260 dpi, c) a film packaging shrunk onto the detergent tablet, which at least partially covers the printing; comprehensive steps a) Provision of a particulate premix, b) Compression of the particulate premix to form a detergent tablet with at least one phase, whereby the particulate premix is compressed with a compression pressure above 1 kN / cm2 ; c) Printing on the surface of the detergent tablet with a print resolution of between 40 and 260 dpi, d) Transport of the printed detergent tablet to a packaging machine, e) Wrapping the printed tablet in film packaging and shrinking the film packaging so that the shrunk film packaging at least partially covers the printing.

2. Process according to claim 1, wherein the time interval between the end of printing in step c) and the wrapping of the printed tablet in step e) is less than 180 seconds, preferably between 1 and 120 seconds, preferably between 1 and 10 seconds and in particular between 1 and 5 seconds.

3. Process according to any one of the preceding claims, wherein the printing on the surface of the detergent tablet has a print resolution of between 80 and 260 dpi, preferably between 120 and 260 dpi.

4. Process according to one of the preceding claims, wherein the printing was applied by means of an inkjet printer.

5. Process according to any one of the preceding claims, wherein the printing covers 10% to 60%, preferably 20% to 45% of the printed phase.

6. Process according to one of the preceding claims, wherein the detergent tablet has a tablet hardness of from 50 N to 300 N and in particular from 70 N to 200 N.

7. Process according to one of the preceding claims, wherein the detergent tablet comprises, based on its total weight, less than 10% by weight, preferably less than 2% by weight, and in particular no binder from the group of polyethylene glycols.

8. Process according to one of the preceding claims, wherein the shrunk-on film packaging completely covers the printing.

9. Process according to any one of the preceding claims, wherein the shrink-wrapped film packaging comprises a water-soluble film material.

10. Process according to one of the preceding claims, wherein the particulate premix is pressed in step b) with a pressing pressure of 1 kN / cm2 to 3 kN / cm2 and in particular with a pressing pressure of 1 kN / cm2 to 3 kN / cm2.