EP2642867B1

EP2642867B1 - Package for tea concentrate

Info

Publication number: EP2642867B1
Application number: EP11779669.8A
Authority: EP
Inventors: Leonardo Andres Bianchi; Krzysztof Pawel Majchrzak; Annette Patricia Miles; Mick Alexis Riechmann
Original assignee: Unilever PLC; Unilever NV
Current assignee: Unilever PLC; Unilever NV
Priority date: 2010-11-26
Filing date: 2011-11-08
Publication date: 2014-10-22
Anticipated expiration: 2031-11-08
Also published as: ES2526148T3; WO2012069311A1; EP2642867A1; PL2642867T3

Description

TECHNICAL FIELD OF THE INVENTION

The present invention relates to packaged liquid compositions for diluting to prepare beverages. In particular the present invention relates to such packaged liquid compositions wherein the liquid composition comprises tea solids in an amount of from 3 to 30% by weight.

BACKGROUND TO THE INVENTION

Beverages based on the tea plant (Camellia sinensis) have been popular throughout the world for hundreds of years. Traditionally such beverages are produced by infusing tea leaves in hot water and separating the aqueous plant extract from the remaining insoluble plant material.
Today such beverages can be prepared by more convenient methods which dispense with the need for manipulation of insoluble plant material by the end-user or consumer. In particular, the beverages can be prepared from instant powders, granules or liquid concentrates which can be conveniently dissolved and/or diluted in water.
Particularly convenient are liquid tea concentrates, especially when packaged in unit doses, wherein a unit dose is suitable for dilution on-demand to make a palatable tea beverage.
International Patent Application published as WO 2010/015504 A (UNILEVER ) discloses packaging for stabilizing consumable products. The packaging has a defined amount of oxygen in its headspace and product portion whereby products packaged in the same are stable in the absence of oxygen scavengers. The exemplified products are liquid tea concentrates.
US 2008/0056623 , which is regarded as the closest prior art, discloses a reclosable disposable container for small quantities of liquid or semi-liquid products.
We have now found that dispensing of liquid tea concentrates from packaging is facilitated by providing a package having specific features.

TESTS AND DEFINITIONS

Tea

"Tea" for the purposes of the present invention means material from Camellia sinensis.

"Green tea" refers to substantially unfermented tea. "Black tea" refers to substantially fermented tea. "Oolong tea" refers to partially fermented tea.
"Fermentation" refers to the oxidative and hydrolytic process that tea undergoes when certain endogenous enzymes and substrates are brought together by mechanical disruption of the cells by maceration of the leaves. During this process colourless catechins in the leaves are converted to a complex mixture of yellow and orange to dark-brown polyphenolic substances.
"Fresh tea leaves" refers to tea leaves and/or stem that have never been dried to a water content of less than 30% by weight, and usually have a water content in the range 60 to 90%.
"Tea juice" refers to juice squeezed out from fresh tea leaves using physical force, as opposed to extracts produced by extraction of tea solids with the use of a solvent.

Viscosity

Viscosity is a measure of the internal resistance to flow exhibited by a fluid which is being deformed by shear stress. As used herein the term "viscosity" refers to the viscosity (in mPa·s) as determined at a temperature of 20°C and a shear rate of 100 s^-1. A protocol for measuring the viscosity of a sample using a rheometer is set out below.
A TA Instruments AR2000 rheometer using a 60 mm diameter, 2° acrylic cone-and-plate configuration is used to measure the viscosity of a sample over a range of shear rates. Rheology Advantage software (TA Instruments) is used to control the rheometer and to collect experimental data. The temperature of the sample is controlled at 20°C using a Peltier plate, and the shear stress (mPa) is measured as the shear rate is stepped from 1 to 200 reciprocal seconds (s^-1) while recording 15 points per decade. The viscosity of the sample (mPa·s) is calculated using Rheology Advance software (TA Instruments). The viscosity of each sample is measured in duplicate.

Miscellaneous

Except in the examples, or where otherwise explicitly indicated, all numbers in this description indicating amounts of material or conditions of reaction, physical properties of materials and/or use may optionally be understood as modified by the word "about".
All amounts are by weight of the final composition, unless otherwise specified.
It should be noted that in specifying any range of values, any particular upper value can be associated with any particular lower value.
For the avoidance of doubt, the word "comprising" is intended to mean "including" but not necessarily "consisting of" or "composed of". In other words, the listed steps or options need not be exhaustive.
The disclosure of the invention as found herein is to be considered to cover all embodiments as found in the claims as being multiply dependent upon each other irrespective of the fact that claims may be found without multiple dependency or redundancy.

SUMMARY OF THE INVENTION

The present invention provides a package in the form of a sachet which has a hollow tubular body enclosed at one end by a first transverse seal and at another end by a second transverse seal containing a liquid composition having a viscosity of less than 10 mPa s within a chamber having a total volume of from 5 to 25 cm³, wherein the liquid composition comprises tea solids in an amount of from 3 to 30% by weight, wherein the chamber has a region which is openable to form a dispensing aperture through which the liquid composition can be dispensed, wherein the region which is openable to form the dispensing aperture is an end of the chamber, wherein the chamber extends away from the end to define a maximum longitudinal distance (l) which is perpendicular to a maximum transverse distance (w) and wherein the ratio (l/w) of the longitudinal distance to the transverse distance is at least 2.5, wherein the maximum transverse distance (w) of the chamber is at least 1.0 cm and less than 4.0 cm and wherein the perimeter of a cross section of the dispensing aperture in a plane normal to the direction of flow of the liquid composition during dispensing is from 16 to 50 mm.
The specified perimeter of the dispensing aperture is found to allow consumers to easily handle the package and to allow dispensing of the liquid composition with minimum spillage. With too small an aperture, tea concentrate is found not to flow freely and smoothly from the chamber under gravity. With too large an aperture, the tea concentrate may flow from the package at such a high rate that it is difficult to direct the flow and/or it causes splashing of dilution liquid into which it is dispensed. This is especially undesirable for tea concentrates which are used to prepare hot beverages as splashing of hot dilution liquid may be hazardous but it is also inconvenient in the preparation of cold beverages owing to increased likelihood of spillage and mess.
The perimeter of a cross section of the dispensing aperture in a plane normal to the direction of flow of the liquid composition during dispensing is a useful parameter in that it relates to the dimension of the smallest constriction which restricts flow of the liquid from the chamber. Preferably the perimeter of the dispensing aperture is at least 17 mm, most preferably at least 18 mm. Additionally or alternatively it is preferred that the perimeter is no greater than 45 mm, more preferably no greater than 40 mm, more preferably still no greater than 35 mm, even more preferably no greater than 25 mm, most preferably no greater than 23 mm.
The chamber has an end which is openable to dispense the liquid composition, wherein the chamber extends away from the end to define a maximum longitudinal distance (l) which is perpendicular to a maximum transverse distance (w) and wherein the ratio (l/w) of the longitudinal distance to the transverse distance is at least 2.5.
The high aspect ratio (i.e. the ratio l/w) of the chamber is found to allow consumers to easily to handle the package and to allow dispensing of liquid tea concentrate with minimum spillage. It is, however, preferred that the aspect ratio is not too high otherwise the package may become difficult to handle and/or store. Therefore the aspect ratio is preferably less than 20, more preferably less than 15, more preferably still less than 10 and most preferably less than 7.
The end of the chamber is preferably openable such that when it is fully open, the package can be held with the maximum longitudinal distance extending vertically downwards from the open end without flow of the liquid composition from the open end. Preferably also the liquid composition is dispensable from the open end at least when the package is oriented with the maximum longitudinal distance extending vertically upwards from the open end.
The package is preferably sized for containing a unit dose of the liquid composition suitable for dilution to prepare a beverage. The chamber has a total volume (V _T) of from 5 to 25 cm³, more preferably from 6 to 16 cm³ and most preferably from 7 to 14 cm³. Additionally or alternatively the amount of liquid composition (V _l) contained in the chamber is from 4 to 18 cm³, more preferably from 5 to 15 cm³ and most preferably from 6 to 14 cm³.
As stated above, the package of the present invention provides for easy pouring, handling and/or opening for a consumer. In this respect it is possible to fill the chamber leaving little headspace and still provide for minimum spillage on opening. Thus the chamber preferably has a headspace and the ratio (V _h/V _T) of headspace volume (V _h = V _T - V _l) to the total volume of the chamber (V _T) is less than 0.15, more preferably less than 0.10 and most preferably from 0.001 to 0.08.
To allow the package to be conveniently handled it is preferred that the maximum longitudinal distance (l) of the chamber is at least 4 cm, more preferably at least 5 cm and most preferably at least 6 cm. However if the package is too long it can become difficult to handle or store. Thus it is preferred that l is less than 18 cm, more preferably less than 16 cm and most preferably less than 14 cm.
Similarly the maximum transverse distance (w) of the chamber is within certain limits to allow ease of handling and/or storage. Thus w is less than 4.0 cm, more preferably less than 3.5 cm and most preferably less than 3.0 cm. Additionally w is at least 1.0 cm, more preferably more than 1.5 cm and most preferably more than 2.0 cm.
The package is preferably sealed prior to opening. In particular the package is sealed to ensure that the chamber is impermeable to microbiological contaminants by which is meant that the packaged composition can be stored for at least 6 months at a temperature of 20°C without the amount of spore-forming bacteria (Bacillus and Clostridia spp) in the liquid composition increasing above 100 cfu / ml.
The package is in the form of a sachet having a hollow tubular body enclosed at one end by a first transverse seal and at another end by a second transverse seal. For example the package may be a pillow-shaped or tetrahedral-shaped sachet. For pillow-shaped sachets the transverse seals are substantially parallel to each other whilst for tetrahedral-shaped sachets the transverse seals are substantially perpendicular to each other. Most preferably the package is tetrahedral shaped as this allows for easier handling of the package. Where the package is in the form of a tetrahedral sachet, the package comprises triangular faces and it is preferred that the sachet can be rested on one of the triangular faces whilst the openable region is at the highest point of the package. Thus the package can be stably rested on a surface even after the region is opened without fear of the liquid composition spilling.
Sachets are typically formed from flexible packaging material. The most preferred packaging material being plastic-foil laminate material, especially material comprising a metal (such as aluminium) foil layer sandwiched between two or more plastic (such as polyethylene terephthalate, polyethylene, polypropylene or combinations thereof) layers.
The openable region of the package preferably comprises a line of weakness in a wall of the chamber. Such a line of weakness may be formed, for example, by scoring the wall (e.g. by laser or other means). In a particularly preferred embodiment the package comprises a seal adjacent to the line of weakness in the wall and the seal comprises one or more perforations to aid initiation of a tear. Additionally or alternatively the line of weakness in the wall of the chamber and the seal are arranged to provide that the region is openable to form a spout.
The liquid composition comprises tea solids in an amount of from 3 to 30% by weight. Such a high concentration of tea solids allows the liquid composition to be used as a beverage precursor; a few mls are suitable for dilution with an aqueous liquid to provide a beverage of the desired strength. It is preferable that the liquid composition comprises tea solids in an amount of at least 4% by weight of the composition, more preferably at least 5% and most preferably at least 6%. Preferably the amount of tea solids is not too high otherwise stability or portionability may be adversely affected. Thus it is preferred that the liquid composition comprises less than 20% tea solids by weight of the composition, more preferably less than 15% and most preferably less than 10%.
Juice expressed from tea leaves (rather than extracted from leaves with a solvent) is found to produce beverages having organoleptic properties different from those of produced from conventional liquid tea concentrates. Furthermore, subjecting tea leaves to an expression step results in tea juice which contains relatively high levels of tea solids without having to subject the juice to a concentration step. Thus it is preferred that the liquid composition comprises expressed tea juice. In particular it is preferred that at least 50% by weight of the tea solids in the liquid composition are provided by the tea juice, more preferably at least 75% and most preferably from 90 to 100%.
The package is relatively easy to open without spillage even where the liquid composition has a relatively low viscosity. Thus the liquid composition has a viscosity of less than 10 mPa s, more preferably less than 8 mPa s and most preferably from 1.5 to 6 mPa s.
The liquid composition may comprise black tea juice, green tea juice or a combination thereof.
Where the composition comprises black tea juice, the composition preferably comprises theaflavins and the weight ratio of theaflavin (TF1) to theaflavin digallate (TF4) is at least 2.0, more preferably at least 3.0, more preferably still at least 3.2 and most preferably from 3.5 to 5.0. Additionally or alternatively the amount of TF1 in the total theaflavins in the liquid composition is preferably at least 40% by weight, more preferably at least 42% by weight and most preferably from 45 to 60%. Suitable methods for determining theaflavin contents can be found, for example in the International patent application published as WO 2009/059927 (Unilever ).
Where the composition comprises green tea juice, the composition preferably comprises catechins and has a weight ratio of non-gallated catechins to gallated catechins of greater than 1.4:1, more preferably greater than 1.6:1, more preferably still greater than 1.8:1 and most preferably from 3:1 to 20:1. Methods of measuring gallated and non-gallated catechin contents can be found, for example in the International patent application published as WO 2010/037768 (Unilever ).
In one embodiment the liquid composition is tea juice and is substantially free from other ingredients. However, it may be desirable to include auxiliary ingredients in the liquid composition such as flavours, diluents (e.g. water), biopolymers or combinations thereof.
The package of the present invention may be manufactured by any suitable means but is preferably manufactured by a process comprising the steps of:

(i) expressing tea juice from fresh tea leaves;
(ii) forming an open chamber;
(iii) dosing a portion of the tea juice into the chamber; and
(iv) sealing the chamber to form the package.

It is possible that a small amount of solvent (e.g. water) is added to the fresh tea leaves during the expression step (i). However, in order to prevent significant extraction of tea solids by the solvent, the moisture content of the fresh leaves during expression is preferably between 30 and 90% by weight, more preferably between 60 and 90%. Preferably the amount of juice expressed is at least 50 ml per kg of fresh leaves, more preferably from 100 to 800 ml per kg of fresh tea leaves and most preferably from 200 to 600 ml per kg of fresh leaves. The expression step produces leaf residue in addition to the juice and the juice is separated from the leaf residue prior to dosing.
Where the package is a sachet the open chamber may conveniently be formed by drawing a web of packaging material around a mandrel; sealing the web into a hollow tube by applying a longitudinal seal; and forming a transverse seal in the tube. A particularly suitable such process is a so-called "vertical form-fill-seal" process.
The tea juice may be dosed "as is", i.e. without any dilution. Alternatively the tea juice may be dosed simultaneously or sequentially with one or more auxiliary ingredients.
From the point of view of food hygiene it is preferred that the tea juice and/or the package is subjected to a sanitisation step such as pasteurisation or UHT treatment. For example the tea juice may be sanitised and the sanitised juice dosed into a previously-sanitised open chamber under sterile conditions. Additionally or alternatively the formed package may be subjected to a santisation step, for example by in-pack pasteurisation or retorting. The sanitisation step should be such that the packaged liquid composition is shelf stable, by which is meant that the packaged composition can be stored for at least 6 months at a temperature of 20°C without the amount of spore-forming bacteria (Bacillus and Clostridia spp) in the liquid composition increasing above 100 cfu / ml.

BRIEF DESCRIPTION OF THE DRAWINGS

Certain embodiments of the invention are illustrated by the drawings, in which:

Fig. 1 a is an elevational front view of a package according to an embodiment of the invention.
Fig. 1b is a sectional side view of the package of Fig. 1 a.
Fig. 2a is an elevational front view of a package according to another embodiment of the invention.
Fig. 2b is an elevational side view of the package of Fig. 2a.
Fig. 2c is a plan view of the package of Fig. 2a after opening.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

A package according to one embodiment of the invention is illustrated in Figs. 1 a and 1 b. The package (1) has a generally pillow shape defined by a wall (6) of flexible packaging material which is sealed at a top end by a first transverse seal (10) and at the bottom end by a second transverse seal (20) parallel with the first transverse seal (10). Between the two transverse seals (10, 20) there extends a hollow tubular body which defines a chamber (3). The chamber (3) contains a liquid tea concentrate, for example an expressed liquid tea juice (2) above which there is a headspace (5).
The first transverse seal (10) has a bottom edge (10a) which extends substantially horizontally across the package (1) but which narrows towards one side edge of the package to form a generally oblong protrusion (6b) of the chamber (3) into the first transverse seal (10). Part way up the protrusion (6b), the wall (6) is scored with a transverse line of weakness (6a) which is tearable to form an open end (4) through which the liquid composition (2) can be dispensed. Positioning of the score line (6a) part way up the protrusion (6b) provides that the part of the protrusion below the opening (4) forms a spout to aid pouring of the liquid composition (2).
Once tom open, the openable end (4) comprises an aperture (not shown) surrounded at its perimeter by the line of weakness (6a).
The chamber (3) extends away from the openable end (4) for a maximum longitudinal distance (l) which is much greater than the maximum transverse distance (w) to provide the package with a high aspect ratio. Thus even though the headspace (5) may be small and the liquid composition (2) of low viscosity, opening of the package can be afforded without risk of spillage of the liquid composition.
A second embodiment of a package according to the invention is illustrated in Figs. 2a, 2b and 2c. The package (1) has a generally tetrahedral shape defined by a wall (6) of flexible packaging material which is sealed at a top end by a first transverse seal (10) and at the bottom end by a second transverse seal (20) perpendicular to the first transverse seal (10). Between the two transverse seals (10, 20) there extends a hollow tubular body which defines a chamber (3). The chamber (3) contains liquid tea juice above which there is a headspace (not shown).
The first transverse seal (10) has a bottom edge (10a) which extends substantially horizontally across the package (1) but which narrows towards one side edge of the package to form a generally oblong protrusion (6b) of the chamber (3) into the first transverse seal (10). Part way up the protrusion (6b), the wall (6) is scored with a transverse line of weakness (6a) which is tearable to form an open end (4) through which the liquid composition can be dispensed. Positioning of the score line (6a) part way up the protrusion (6b) provides that the part of the protrusion below the opening (4) forms a spout to aid pouring of the liquid composition (2). The seal (10) also comprises a line of perforations (10b) formed therethrough and generally aligned with the line of weakness (6a). Perforation of the seal (10) in this manner allows for easy initiation of the tear line which forms the opening (4) of the chamber (3).
Once tom open, the openable end (4) comprises an aperture (4a) surrounded at its perimeter by the line of weakness (6a) as shown in Fig. 2c.
The chamber (3) extends away from the openable end (4) for a maximum longitudinal distance (l) which is much greater than the maximum transverse distance (w) to provide the package with a high aspect ratio. Thus even though the headspace may be small and the liquid composition of low viscosity, opening of the package can be afforded without risk of spillage of the liquid composition.
Owing to the tetrahedral shape of the package (1), the package has four substantially triangular faces. One of the triangular faces (30) is generally opposite to the openable end (4). Thus the package (1) can be rested on the triangular face (30) whilst the openable end (4) is at the highest point of the package. This arrangement allows for the package to be stably rested on a surface even after the end (4) is opened without fear of the liquid composition spilling from the aperture (4a).

EXAMPLES

Example 1

The effect of the aperture dimensions on pouring properties was studied for sachets similar to the package described with reference to Figs. 2a to 2c. The packages used all had a transverse distance (w) of 2.5 cm and had a longitudinal distance (l) of either 8 or 10 cm. Packages with a longitudinal distance (l) of 8 cm contained 8 ml of black tea juice made as described in WO 2009/059927 whilst those of longitudinal distance (l) of 10 cm contained 10 ml of the black tea juice.
The aperture size was varied by varying the width of the protrusion (6b) and/or the line of weakness (6a) (which was scored by laser).

The results are shown in the following table.

Package length (cm)	Perimeter of aperture after opening (mm)	Observations on pouring
10	12.0	Few initial drops and then flow stops - need to apply pressure to sachet to empty
10	12.0	Few initial drops and then flow stops - need to apply pressure to sachet to empty
10	11.0	Few initial drops and then flow stops - need to apply pressure to sachet to empty
10	12.0	Few initial drops and then flow stops - need to apply pressure to sachet to empty
10	13.0	Few initial drops and then flow stops - need to apply pressure to sachet to empty
10	13.0	Few initial drops and then flow stops - need to apply pressure to sachet to empty
10	12.0	Few initial drops and then flow stops - need to apply pressure to sachet to empty
8	14.3	No liquid came out until pressure applied
8	13.7	Few initial drops and then flow stops - once pressure applied liquid squirted sideways
8	15.2	No liquid came out until pressure applied
10	21.3	Poured satisfactorily
10	18.8	Poured satisfactorily
10	20.9	Poured satisfactorily

These results show that only sachets which had an aperture with a perimeter in excess of 15.2 mm poured satisfactorily.

Example 2

Two sachet designs, each containing 8 ml of black tea juice made as described in WO 2009/059927 were tested for ease of handling (opening & pouring).
The sachet designs were similar to the package described with reference to Figs. 2a to 2c and differed only in the aspect ratio of the chamber. In the first package, the longitudinal distance (l) was 8 cm and the transverse distance (w) was 2.5 cm, whilst in the second package the longitudinal distance (l) was 5 cm and the transverse distance (w) was 4.5 cm.
For the majority of consumers the second package was found to be too chunky and difficult to handle whereas consumers found the first package the easiest to handle and open.

Claims

A package (1) in the form of a sachet which has a hollow tubular body enclosed at one end by a first transverse seal and at another end by a second transverse seal containing a liquid composition (2) having a viscosity of less than 10 mPa s within a chamber (3) having a total volume of from 5 to 25cm³, wherein the liquid composition (2) comprises tea solids in an amount of from 3 to 30% by weight, wherein the chamber (3) has a region which is openable to form a dispensing aperture (4) through which the liquid composition can be dispensed, wherein the region which is openable to form the dispensing aperture is an end of the chamber, wherein the chamber extends away from the end to define a maximum longitudinal distance (l) which is perpendicular to a maximum transverse distance (w) and wherein the ratio (l/w) of the longitudinal distance to the transverse distance is at least 2.5, wherein the maximum transverse distance (w) of the chamber is at least 1.0 cm and less than 4.0 cm and wherein the perimeter of a cross section of the dispensing aperture in a plane normal to the direction of flow of the liquid composition during dispensing is from 16 to 50 mm.
The package as claimed in claim 1, wherein the perimeter of the dispensing aperture is at least 17 mm, preferably at least 18 mm.
The package as claimed in claim 1 or 2 wherein the perimeter is no greater than 35 mm, preferably no greater than 25 mm.
The package as claimed in any one of the preceding claims wherein the region which is openable to form the dispensing aperture is an end of the chamber, wherein the chamber extends away from the end to define a maximum longitudinal distance (l) which is perpendicular to a maximum transverse distance (w) and wherein the ratio (l/w) of the longitudinal distance to the transverse distance is at less than 20.
The package as claimed in any one of the preceding claims, wherein the amount of liquid composition (V _l) contained in the chamber is from 4 to 18 cm³.
The package as claimed in any one of the preceding claims, wherein the chamber has a headspace and the ratio (V _h/V _T) of headspace volume (V _h) to the total volume of the chamber (V _T) is from 0.001 to 0.15.
The package as claimed in any one of the preceding claims wherein the liquid composition comprises tea juice.
The package as claimed in claim 6 wherein at least 50% by weight of the tea solids are provided by the tea juice.
The package as claimed in any one of the preceding claims wherein the liquid composition comprises tea solids in an amount of from 4 to 20% by weight, preferably from 5 to 15% by weight
The package as claimed in any one of the preceding claims, wherein the package is a tetrahedral-shaped sachet.
The package as claimed in any one of the preceding claims, wherein the openable region comprises a line of weakness (6a) in a wall (6) of the chamber.
A package (1) according to claim 11 wherein:
• the package has a generally pillow or tetrahedral shape defined by a wall (6) of flexible packaging material which is sealed at a top end by the first transverse seal (10) and at the bottom end by the second transverse seal (20) parallel with or perpendicular to the first transverse seal (10) respectively;

• between the two transverse seals (10, 20) there extends a hollow tubular body which defines the chamber (3), which contains liquid tea juice (2) and head space (5);

• the first transverse seal (10) has a bottom edge (10a) which extends substantially horizontally across the package (1) but which narrows towards one side edge of the package to form a generally oblong protrusion (6b) of the chamber (3) into the first transverse seal (10);

• the line of weakness (6a) is a transverse line of weakness formed by scoring the wall (6) part way up the protrusion (6b);

• the chamber (3) extends away from the openable end (4) for a maximum longitudinal distance (l) which is much greater than the maximum transverse distance (w) to provide the package with a high aspect ratio.
The package as claimed in claim 11, wherein the package comprises a seal adjacent to the line of weakness in the wall and the seal comprises one or more perforations to aid initiation of a tear.
The package as claimed in claims 11, 12 or 13 wherein the line of weakness is formed by laser scoring.
The package as claimed In any one of the preceding claims wherein the liquid composition has a viscosity of less than 8 mPa s.