EP3480352B1 - Packaging - Google Patents

Description

The invention relates to packaging, in particular a packaging sack with at least one weldable spunbonded fabric or packaging spunbonded fabric, the spunbonded fabric having continuous filaments, which preferably consist of thermoplastic material. - Within the scope of the invention, spunbonded webs made from continuous filaments are used. As is known, endless filaments differ because of their quasi endless length from staple fibers, which have much shorter lengths of, for example, 10 mm to 60 mm. It is within the scope of the invention that a spunbonded or packaging spunbonded nonwoven is produced by means of a spunbond process.

Weldable spunbonded nonwovens or packaging spunbonded nonwovens for packaging walls - in particular sack-shaped packaging - are known in practice in various embodiments. The spunbonded nonwovens can be used separately as packaging walls or as part of a laminate for the packaging walls. For example, laminates of spunbonded nonwovens and plastic films are known for this purpose. Packaging walls made of spunbonded fabrics or with spunbonded fabrics are also known, in particular, for sack-shaped packaging for bulk goods with fill weights of 25 to 500 kg. Spunbonded nonwovens are also used for cement bags.

The production of a bag-shaped packaging based on a spunbonded fabric is expediently carried out as follows. A tube is first produced from the spunbonded fabric (so-called “tube”) and opposite side ends of the nonwoven web are connected to one another, in particular welded to one another. Then the tube is cut to the desired bag length, the resulting product becomes folded or folded and then a bottom sheet is placed as a bottom component and a top sheet as a lid component and then welded to the bag body.

The bag-shaped packaging known to date or produced in the manner explained above often leaves something to be desired in terms of strength. In the free fall of the filled packaging sacks - in particular cement sacks - from drop heights of, for example, 2 m - the packaging sacks tear open at least after several attempts to drop them. The tearing usually takes place in the area of the weld seams or sealing seams of the packaging bags. In this respect, the known packaging sacks - for example cement sacks - are in need of improvement. - The spunbonded nonwovens used for the production of the known packaging bags also leave something to be desired in terms of their processability. This applies in particular to the weldability or sealability of the spunbonded nonwovens when producing a packaging or a packaging sack. Normally, relatively high processing temperatures or welding temperatures are required, which initially means an undesirably high expenditure of energy. Furthermore, areas of the nonwoven material are damaged by high processing or welding temperatures and this already results in a loss of strength. In addition, the strength and durability of the welds leave something to be desired. Furthermore, for the known packaging bags produced from the spunbonded nonwovens, a coating with additional material is normally absolutely necessary, so that the raw material expenditure or consumption is also undesirably high. As a result, there is room for improvement.

Accordingly, the invention is based on the technical problem of packaging, in particular a packaging bag with a weldable Spunbond or packaging spunbond to indicate which spunbond is processable or weldable on the one hand in a relatively simple and inexpensive manner and on the other hand also meets all requirements in terms of strength or stability in the processed state.

• wobei entweder die Endlosfilamente Monokomponentenfilamente sind und mindestens 3 Gew.-%, vorzugsweise mindestens 4 Gew.-% zumindest eines Füllstoffes zur Verbesserung der Schweißbarkeit des Spinnvlieses - insbesondere zur Herabsetzung der Schweißtemperatur beim thermischen Verschweißen des Spinnvlieses - aufweisen,
• oder wobei die Endlosfilamente als Multikomponentenfilamente, insbesondere als Bikomponentenfilamente ausgebildet sind und wobei eine an der Oberfläche der Multikomponentenfilamente bzw. Bikomponentenfilamente angeordnete Kunststoffkomponente mindestens drei 3 Gew.-%, vorzugsweise mindestens 4 Gew.-% zumindest eines Füllstoffes zur Verbesserung der Schweißbarkeit des Spinnvlieses - insbesondere zur Herabsetzung der Schweißtemperatur beim thermischen Verschweißen des Spinnvlieses - aufweist,

und wobei das Spinnvlies/Verpackungsspinnvlies die Verpackungswandung bildet und/oder Bestandteil der Verpackungswandung ist und wobei Abschnitte des Spinnvlieses/Verpackungsspinnvlieses im Seitenwandungsbereich und/oder im Bodenbereich und/oder im Deckelbereich der Verpackung bzw. der Verpackungswandung miteinander verschweißt sind.To solve the technical problem, the invention teaches a packaging, in particular a packaging sack, preferably for containing pourable and / or free-flowing products such as cement and the like, with at least one spunbonded or packaging spunbonded nonwoven, the spunbonded or packaging spunbonded nonwoven having continuous filaments made of thermoplastic material,

• wherein either the continuous filaments are monocomponent filaments and have at least 3% by weight, preferably at least 4% by weight, of at least one filler to improve the weldability of the spunbonded fabric - in particular to lower the welding temperature during thermal welding of the spunbonded fabric,
• or wherein the continuous filaments are designed as multicomponent filaments, in particular as bicomponent filaments, and wherein a plastic component arranged on the surface of the multicomponent filaments or bicomponent filaments has at least three 3% by weight, preferably at least 4% by weight, of at least one filler to improve the weldability of the spunbonded nonwoven - in particular to reduce the welding temperature during thermal welding of the spunbonded web,

and wherein the spunbond / packaging spunbond forms the packaging wall and / or is part of the packaging wall and wherein sections of the spunbonded nonwoven / packaging spunbonded nonwoven are welded to one another in the side wall area and / or in the bottom area and / or in the lid area of the packaging or the packaging wall.

According to a particularly preferred embodiment of the invention, the continuous filaments or at least one component of the continuous filaments of the weldable spunbond, in particular the weldable packaging spunbond, have 4 to 25% by weight of the filler, preferably 5 to 20% by weight and very preferably 6 to 15% by weight .-% of the filler. The individual proportions of the constituents of the continuous filaments - in particular the plastic component or the plastic components of the continuous filaments - add up to a total of 100% by weight with the proportion of the filler.

It is within the scope of the invention that the filler is at least one organic filler, expediently at least one metal salt and preferably at least one alkaline earth metal salt. A particularly recommended embodiment of the invention is characterized in that the filler is a calcium salt and very particularly preferred is the filler calcium carbonate. Calcium carbonate has proven particularly useful as a filler for the weldable spunbonded fabric to solve the technical problem. In principle, calcium sulfate can also be used as a filler.

According to one embodiment variant of the invention, monocomponent filaments are used as continuous filaments for a weldable spunbonded nonwoven. In this case, the monocomponent filaments of the weldable spunbonded nonwoven preferably have at least 5% by weight of filler or calcium carbonate, preferably at least 7% by weight, advantageously 7 to 25% by weight, preferably 8 to 22% by weight and very preferably 10 up to 20% by weight of filler or calcium carbonate as filler. It is there within the scope of the invention that the filler is distributed homogeneously or essentially homogeneously in the continuous filaments or, according to the recommended embodiment, is arranged at least on the surface of the continuous filaments or essentially on the surface of the continuous filaments.

A particularly proven embodiment of the invention is characterized in that the continuous filaments of the weldable spunbonded fabric are designed as multicomponent filaments, in particular as bicomponent filaments. The filler is preferably contained in a plastic component arranged on the outer surface of the multicomponent filaments or bicomponent filaments. It is recommended that a first plastic component arranged on the surface of the multicomponent filaments or the bicomponent filaments has an identical or preferably a lower melting point than at least a second plastic component of the multicomponent filaments or bicomponent filaments and that the filler contain at least the same or lower melting plastic component is or is contained essentially or only in the first plastic component with the same or lower melting point.

According to a preferred embodiment of the invention, the multicomponent filaments or the bicomponent filaments of the weldable spunbonded fabric have a core-sheath configuration. The filler is expediently contained in the sheath component of these multicomponent filaments or bicomponent filaments. According to a highly recommended embodiment of the invention, the plastic component of the multicomponent filaments or bicomponent filaments of the weldable spunbonded fabric which has the same or lower melting point is the sheath component and the filler is then at least in contain this jacket component or contain substantially or only in the jacket component.

Polyolefins or other thermoplastic materials are preferably used as the plastic component or as plastic components for the continuous filaments of the spunbonded nonwovens. It is also within the scope of the invention that blends of the plastics mentioned are used as plastic components or as plastic components. - According to one embodiment of the invention, the weldable spunbond is designed as a spunbond made of bicomponent filaments, specifically bicomponent filaments with a core-sheath configuration. The component with the same or lower melting point is located in the jacket and consists, for example, of a polypropylene copolymer or essentially of a polypropylene copolymer. It must be taken into account here that it is within the scope of the invention that the filler component - preferably in the proportions specified above - is additionally contained in the jacket component. The higher or equal melting component is arranged in the core of the bicomponent filaments and consists for example of polypropylene or essentially of polypropylene. According to a further embodiment variant, a polyethylene can be used as the lower-melting component or as the sheath component of the bicomponent filaments or multicomponent filaments, and a polypropylene can be used as the higher-melting component or as the core component. - According to a recommended embodiment, at least one plastic component of the bicomponent filaments or the multicomponent filaments of the spunbonded nonwoven consists of a polyolefin or essentially of a polyolefin. A proven embodiment is characterized in that both or all plastic components of the bicomponent filaments or the multicomponent filaments of the weldable spunbonded nonwoven made of polyolefins or consist essentially of polyolefins. In principle, however, the use of other thermoplastics or their blends for the components is also possible.

It has already been shown that, according to a particularly preferred embodiment of the invention, the filler is arranged in a plastic component of the bicomponent filaments or multicomponent filaments, which is located on the surface of the filaments. This is preferably the lower melting plastic component in the filament and very preferably the lower melting component is the sheath component of a core-sheath configuration of the bicomponent filaments or multicomponent filaments. It is recommended that 5 to 25% by weight, preferably 7.5 to 22.5% by weight and very preferably 10 to 20% by weight of the filler - in particular the calcium carbonate - in the one arranged on the surface of the filaments is preferably lower melting plastic component, preferably contained in the lower melting plastic component in the sheath of the bicomponent filaments or multicomponent filaments. The filler or the calcium carbonate is expediently distributed homogeneously or essentially homogeneously in the plastic component or arranged on the outer surface or essentially on the outer surface of the plastic component.

It is within the scope of the invention that in the bicomponent filaments or multicomponent filaments of a spunbonded nonwoven, the mass ratio of the first - preferably lower melting - plastic component - in particular the jacket component - to the second - preferably higher melting - plastic component - in particular the core component - 10:90 to 35: 65, advantageously 15:85 to 35:65, preferably 20:80 to 50:50 and preferably 25:75 to 45:55. In spunbonded fabrics or in packaging wall areas with a spunbonded fabric, in or on which a welding or sealing does not take place, according to a proven embodiment, the mass ratio of the first - preferably lower melting - plastic component - in particular the jacket component - to the second - preferably higher melting - component - In particular for the core component - to 20: 80 to 30: 70, preferably to 20: 80 to 25: 75. In contrast, in spunbonded nonwovens or in the packaging wall areas, in or on which welding or sealing takes place, the mass ratio of the first is preferably lower melting plastic component - in particular the sheath component - to the second, preferably higher melting component - in particular the core component - 35: 65 to 50: 50, preferably 40: 60 to 45: 55. It is within the scope of the invention that in the case of multicomponent filaments or Bicomponent filaments from for one e Welding provided spunbonded nonwovens or spunbonded areas, the proportion of the sheath component in relation to the core component is higher than in the case of multicomponent filaments or bicomponent filaments of spunbonded nonwovens or spunbonded areas which are not intended for welding.

A particularly preferred embodiment of the invention is characterized in that the weldable spunbond is a calendered spunbond. It is recommended that a surface of this spunbonded fabric be calendered smooth and a surface profiled calendered. However, both surfaces of the spunbonded fabric can also be smoothly calendered. It is within the scope of the invention that the ratio of the strength or tensile strength of the weldable spunbonded fabric in the machine direction (MD) to the strength or tensile strength of the spunbonded fabric transverse to the machine direction (CD) is either 1 or greater than 1, preferably greater than 1 , 1 and especially is preferably greater than 1.2. Machine direction means in particular the conveying direction of the deposited spunbonded nonwoven on a shelf or on a shelf device.

It is also within the scope of the invention that a weldable spunbonded fabric is produced according to the following method: First, continuous filaments are spun using a spinnerette and then these filaments are cooled in a cooling device and then drawn using a stretching device and then on a depositing device for the spunbonded fabric stored. In this respect, it is within the scope of the invention that the weldable spunbonded fabric or weldable packaging spunbonded fabric is produced as a spunbond nonwoven by a spunbond process. According to a particularly preferred embodiment of the invention, the cooling device is divided into at least two cabin sections arranged one above the other or one behind the other in the filament flow direction, cooling air with different convective heat dissipation properties - in particular cooling air with different temperature - being introduced into the filament flow chamber from these cabin sections. It is recommended that the cooling device only have two such cabin sections arranged one above the other or one behind the other in the filament flow direction. The cooling device is preferably connected via an intermediate channel - in particular via an intermediate channel converging in the filament flow direction - to a lower channel of the drawing device. The endless filaments are thus passed through the cooling device, then through the intermediate channel and then through the pulling channel. Finally, the filaments for the spunbonded nonwoven web or for the spunbonded nonwoven are deposited on a depositing device, which is preferably designed as a depositing screen belt or as an endlessly rotating depositing screen belt.

A very particularly recommended embodiment of the method or the device for producing a weldable spunbond is characterized in that the unit comprising the cooling device, the intermediate channel and the connecting channel connected to it is designed as a closed unit and that apart from the supply of the cooling air in the cooling device, no further air supply in this closed aggregate takes place. Furthermore, in the course of the production of the weldable spunbonded fabric, it is preferred that at least one diffuser is arranged between the pulling channel and the depositing device, through which the filaments are guided in the filament flow direction to the depositing device. At least two diffusers, preferably two diffusers, are expediently arranged one behind the other in the filament flow direction between the pulling channel and the storage device. Furthermore, a recommended embodiment of the invention is characterized in that the filaments in the area of the spinnerette or between the spinnerette and the cooling device are passed through a monomer suction device. In this monomer extraction device, the gases emerging in addition to the filaments are removed in the form of monomers, oligomers, decomposition products and the like from the filament formation space below the spinnerette or from the device.

It is within the scope of the invention that the spunbonded fabric deposited from the continuous filaments is pre-consolidated or consolidated with at least one calender. The calendering can be done inline or offline. For a calendering of this type, it is recommended that a calender have an embossing area of 10 to 90%, preferably 15 to 35% and very preferably 18 to 30%. According to a preferred embodiment, only one of two calender rolls has an engraving and preferably the embossing surface specified above and the opposite or assigned calender roll is smooth or essentially smooth and without engraving. The embossing depth of the calender engraving is preferably 0.1 to 0.8 mm, preferably 0.1 to 0.6 mm and very preferably 0.2 to 0.4 mm. It is recommended that the number of engraving points on a calender roll or the calender roll with engraving is greater than 30 / cm ² and preferably greater than 40 / cm ² . The number of engraving points of a calender roll or the calender roll with engraving is particularly preferably more than 45 / cm ² . According to a proven embodiment, the engraving points of a calender roll or the calender roll with engraving have a diamond shape in plan view. According to a further embodiment, the spunbonded fabric is calendered with a calender comprising two calender rolls with a smooth surface.

According to a further embodiment of the invention, the calendering of a spunbonded nonwoven can also take place with a belt calender. An embodiment variant is characterized in that the calendering is carried out at least in two or two stages. The deposited spunbonded fabric is first calendered with a calender or with a standard calender which has an engraving, preferably the engraving explained above. In a second step, the spunbonded fabric is then calendered with a calender from two calender rolls with a smooth surface or calendered with a belt calender. In the calender consisting of two calender rolls with a smooth surface, one surface can be plastic-coated and one surface can be made of steel or essentially of steel.

The above-described calendering of the spunbonded fabric has proven particularly useful with regard to solving the technical problem according to the invention. Calendered or pre-consolidated / consolidated spunbonded webs in the manner described can be welded particularly advantageously or welded into packaging. - The spunbonded nonwovens produced can In the course of the production of packaging, it can be combined and coated easily and easily with other layers, in particular with plastic films and / or meltblown nonwovens or other spunbond nonwovens.

The production of a weldable spunbonded nonwoven or weldable packaging spunbonded nonwoven by a spunbond process explained above has proven particularly useful in the context of the invention. In this way, spunbonded nonwovens with optimized placement quality can be obtained and very homogeneous spunbonded nonwovens can be produced. Above all, in this preferred method, the spunbonded fabric deposit can be optimized to the extent that thin spots and thick spots in the spunbonded fabric are considerably reduced in comparison to other known methods. When analyzing a plurality of defined spunbonded nonwoven surface sections - for example when examining a plurality of spunbonded nonwoven squares of 2 × 2 cm ² - in the spunbonded nonwovens produced using the spunbond method according to the invention, the range between the lightest thin point or the lightest analyzed square and the heaviest thick spot or the heaviest analyzed square can be significantly reduced compared to other known manufacturing processes. For example, the span can be reduced from over 30 g / m ² in other known processes to approximately 15 g / m ² in the process used according to the invention.

To this extent, the invention is based on the knowledge that the spunbond nonwovens produced as described above can be excellently processed into packaging - for example into packaging sacks - and in particular can be easily and easily sealed. In this context, the invention is also based on the knowledge that the welding temperature for welding these spunbonded nonwovens or packaging spunbonded nonwovens according to the invention compared to those known according to others Process produced spunbonded can be significantly reduced. This advantageous lowering of the welding temperature results above all in combination with the filler according to the invention, in particular in the form of calcium carbonate. The weldable spunbonded webs produced by the preferred method advantageously have fewer thin spots than other spunbonded webs and consequently hardly any thin spots can be damaged during welding. As a result, the spunbond nonwovens produced are characterized by optimum processability, in particular weldability, and they have the optimal basic requirements for the production of packaging.

Spunbond nonwovens have particularly advantageous properties for the production of packaging, in which the ratio of the strength or tensile strength of the spunbonded fabric in the machine direction (MD) to the strength or tensile strength of the spunbonded fabric transverse to the machine direction (CD) is 1 or greater than 1, is preferably greater than 1.1, preferably greater than 1.2 and very preferably greater than 1.25. The explained preferred features of the spunbonded nonwoven or the method for producing the spunbonded nonwoven and the advantages achieved thereby combine in an optimal manner with the filler according to the invention or with the filler content according to the invention and the advantages achieved thereby.

The invention relates to a packaging, in particular a packaging sack - for example a cement sack - preferably for receiving pourable and / or free-flowing products such as cement and the like. The packaging according to the invention has at least one spunbonded nonwoven or packaging spunbonded nonwoven, the spunbonding nonwoven forming the packaging wall and / or being part of the packaging wall and with sections of the spunbonding nonwoven or the spunbonding nonwoven in the Side wall area and / or in the bottom area and / or in the lid area of the packaging wall are welded together. It is within the scope of the invention that the packaging has at least one flat bottom component and / or at least one flat cover component which is welded to the remaining packaging wall or to the side wall of the packaging. It is also within the scope of the invention that the flat lid component and / or the flat bottom component of the packaging consist / consist of at least one spunbonded nonwoven or each of a spunbonded nonwoven and preferably the same spunbonded nonwoven material as the rest of the packaging or how the side wall. If, for the side wall and for the flat cover component and / or the flat bottom component of the packaging wall, spunbonded webs made of multicomponent filaments or bicomponent filaments with a first or lower melting plastic component on the outer surface are used, a particularly preferred embodiment of the invention is characterized in that the spunbonded webs for the flat cover component and / or for the flat bottom component have a higher proportion of the first or lower melting plastic component than the spunbonded fabric or the spunbonded fabrics for the side wall of the packaging wall. The proportion of the first or lower-melting plastic component in the spunbonded webs arranged on the outer surface of the multicomponent or bicomponent filaments is expediently 1.2 times to 3.5 times, preferably 1.5 times, for the flat cover component and / or for the flat bottom component up to 2.5 times as large as the proportion of the first or lower melting plastic component in the multicomponent or bicomponent filaments of the spunbonded fabric or the spunbonded fabrics for the side wall of the packaging. The melting points of the two plastic components can also be the same or essentially the same.

A particularly preferred embodiment of the invention is characterized in that a spunbonded or spunbonded fabric is / are components of a packaging wall laminate and that the laminate preferably has at least one film, preferably a plastic film, in addition to the spunbonded fabric. Both the side wall and the flat cover component and / or the flat bottom component of the packaging wall can be designed as such a packaging wall laminate. A very recommended embodiment of the invention is characterized in that the film or the plastic film of the laminate is arranged on the inside of the packaging wall.

It is within the scope of the invention that the packaging according to the invention - in particular a packaging sack according to the invention - has a flat lid component which is part of the packaging wall and has at least one - expediently a weldable spunbonded fabric, which is specified in more detail above - and that the spunbonded fabric of the lid component with the side wall or is firmly connected to the spunbonded nonwoven material of the side wall of the packaging, in particular is welded. It is also within the scope of the invention that the spunbonded nonwoven of the cover component has multicomponent filaments or bicomponent filaments or consists of multicomponent filaments or bicomponent filaments or essentially consists and that the mass ratio of the first or lower melting plastic component arranged on the outer surface of the filaments to the at least one a second or higher melting plastic component is 35:65 to 50:50 and preferably 40:60 to 45:55. As already explained above, the melting points of the two plastic components can also be the same or essentially the same.

The packaging according to the invention - in particular the packaging sack according to the invention - preferably has at least one flat bottom component which is part of the packaging wall and which has at least one spunbonded or packaging spunbonded, in particular one specified above. This spunbonded nonwoven or packaging spunbonded nonwoven forms the base component and / or is part of the base component. The at least one spunbonded nonwoven of the base component is preferably firmly connected, preferably welded, to the side wall or to the spunbonded nonwoven material of the side wall of the packaging. It is recommended that the spunbonded nonwoven of the bottom component has multicomponent filaments or bicomponent filaments or consists of multicomponent filaments or bicomponent filaments or consists essentially of it and that the mass ratio of the first or lower melting plastic component arranged on the outer surface of the filaments to the at least one second or higher melting plastic component is 35: 65 to 50: 50 and preferably 40: 60 to 45: 55.

The invention is based on the knowledge that the weldable spunbonded nonwoven or weldable packaging spunbonded nonwoven can be produced in a simple, inexpensive and problem-free manner and can be processed into packaging, in particular can be welded. It is of particular importance in the context of the invention that the required welding temperatures when welding the spunbonded nonwovens can be significantly reduced in comparison to the processing measures known from practice. Above all, you can work with a homogeneous welding temperature. The invention is further based on the finding that thin spots and thick spots in the spunbonded fabric for welding are largely problematic can be avoided. - Above all, the invention is based on the knowledge that the advantages set out above come about in particular through the combination of the filler according to the invention - in particular calcium carbonate - on the one hand with the implementation of the spunbond process according to the invention.

The invention is based, inter alia, on the knowledge that the filler according to the invention, in particular in the form of calcium carbonate, requires the spunbonded fabric to be better weldable. It is assumed that the filler or the calcium carbonate on the one hand absorbs less heat than the assigned plastic component and on the other hand has a higher thermal conductivity than the plastic. The result is that the filler or the calcium carbonate can meter the heat introduced into the plastic to be melted or softened, or can emit it, so that the associated plastic component can be melted in a targeted manner. The invention is also based on the knowledge that a filler in the form of calcium carbonate improves the UV stability of the filaments or the spunbonded nonwovens. An additional UV stabilizer is therefore not required for the plastic of the spunbonded nonwoven and raw material can be saved here. - The optimal processability or weldability of a weldable spunbonded fabric also results from the advantageous deposition quality of the filaments or the spunbonded fabric when the spunbond process according to the invention is implemented. A substantially better homogeneity of the spunbonded web is achieved in comparison with other known processes, and as a result the processing temperature or welding temperature for the spunbonded webs can be considerably reduced compared to known nonwovens.

The spunbonded nonwovens and the packaging according to the invention produced therefrom have excellent strength. This applies both to the packaging wall itself and to connecting seams - in particular weld seams - between areas of the packaging wall. The packaging wall and the connecting seams between packaging wall areas are characterized by a high mechanical resistance. In drop tests with filled packaging according to the invention - in particular packaging bags according to the invention filled with cement - the packaging wall or the weld seams between the packaging wall areas are seldom or not damaged at all. In contrast to the packaging bags known from practice, a tearing open of the packaging wall is hardly observed. However, a weldable spunbonded fabric or a packaging according to the invention produced therefrom has further advantages. On the one hand, the packaging wall can be cleaned without major problems, in particular cleaned from the outside. On the other hand, the packaging according to the invention is also distinguished by an appealing external visual appearance. Furthermore, excellent barrier effects can be set in a weldable spunbonded fabric produced according to the invention or in the packaging produced therefrom, so that in particular an additional outer coating of the packaging is not necessary.

• Fig. 1 Eine perspektivische Ansicht einer erfindungsgemäßen Verpackung in Form eines Verpackungssackes,
• Fig. 2 einen Vertikalschnitt durch eine Vorrichtung zur Durchführung eines Verfahrens zur Herstellung eines schweißbaren Spinnvlieses bzw. Verpackungsspinnvlieses und
• Fig. 3 einen Querschnitt durch ein Bikomponentenfilament eines Spinnvlieses bzw. Verpackungsspinnvlieses
  1. a) als Bestandteil der Verpackungswandung im Seitenwandungsbereich des Verpackungssackes
  2. b) als Bestandteil der Verpackungswandung der Bodenkomponente und/oder der Deckelkomponente des Verpackungssackes.

The invention is explained in more detail below on the basis of a drawing which represents only one exemplary embodiment. In a schematic representation:

• Fig. 1 A perspective view of a packaging according to the invention in the form of a packaging bag,
• Fig. 2 a vertical section through an apparatus for performing a method for producing a weldable spunbonded or packaging spunbonded and
• Fig. 3 a cross section through a bicomponent filament of a spunbonded or packaging spunbonded
  1. a) as part of the packaging wall in the side wall area of the packaging bag
  2. b) as part of the packaging wall of the bottom component and / or the lid component of the packaging bag.

In the Fig. 1 A packaging according to the invention is shown in the form of a packaging bag 1 for bulk goods - in particular for cement. The packaging wall of this packaging bag 1 has weldable spunbonded nonwovens 2. These spunbonded nonwovens 2 or packaging spunbonded nonwovens consist of continuous filaments 3 made of thermoplastic material. The continuous filaments 3 contain at least 3% by weight of a filler 4 in the form of calcium carbonate to improve the weldability of the filaments or the spunbond nonwoven 2 and in particular to lower the welding temperature during thermal welding of the filaments or the spunbonded nonwoven 2.

The in Fig. 1 The illustrated packaging bag 1 has a side wall 5 made of a spunbonded fabric, which was welded with its side ends 6 into a tube, as it were. In the bottom area of the packaging bag 1, a flat bottom component 7 in the form of a spunbonded nonwoven 2 is arranged and welded to the side wall 5 of the packaging bag 1. Likewise, a flat lid component 8 in the form of a spunbonded nonwoven 2 is arranged in the lid area of the packaging bag 1 and with the Side wall 5 welded. A plastic film can also be arranged on the inside of the packaging wall of the packaging bag 1, but in the exemplary embodiment according to FIG Fig. 1 was not shown. The spunbonded fabrics used for the side wall 5, the base component 7 and the cover component 8 of the packaging bag 1 preferably consist, and in the exemplary embodiment, of bicomponent filaments with a core-sheath configuration (see also Fig. 3 ). Of the two plastic components of these bicomponent filaments, the lower-melting plastic component is the sheath component 9 and the higher-melting plastic component is the core component 10. The filler 4 in the form of calcium carbonate is preferred and in the exemplary embodiment is only contained in the sheath component 9 of the bicomponent filaments.

In the Fig. 2 a particularly preferred device for producing the spunbonded nonwovens 2 is shown. The endless filaments 3 are first spun here by means of a spinnerette 11 and then passed through a monomer suction device 12. Subsequently, the endless filaments 3 are cooled in the cooling device 13. The cooling device 13 preferably has, in the exemplary embodiment, two cabin sections 14, 15 arranged one above the other or one behind the other in the filament flow direction, from which cooling air of different temperatures is introduced into the filament flow space. Following the cooling device 13, the endless filaments 3 reach the intermediate channel 16 converging in the filament flow direction. A connecting channel 17 of the drawing device 18 connects to this intermediate channel 16. This configuration serves to stretch the continuous filaments 3. The continuous filaments 3 emerging from the pulling channel 17 are then preferred and, in the exemplary embodiment, are guided through two diffusers 19, 20 arranged one above the other or in the filament flow direction. Recommended and In the exemplary embodiment, an ambient air inlet gap 25 is provided between the diffusers 19, 20, through which ambient air can penetrate. Expediently and in the exemplary embodiment, the endless filaments 3 are then deposited on the depositing device for spunbonded web 2 designed as a depositing belt 21. The spunbonded nonwoven 2 is conveyed away in the machine direction M by means of the deposit screen belt 21.

Preferably and in the exemplary embodiment, the spunbonded fabric 2 is calendered or pre-consolidated / consolidated by means of a calender 22. According to one embodiment variant, a calender roll 23 is provided with an engraving (not shown in any more detail), and a calender roll 24 interacting with or associated with the calender 22 is preferred and, in the exemplary embodiment, is equipped with a smooth surface. A spunbonded fabric 2 produced in the manner described can be used simply and without problems for a packaging wall (side wall 5 and / or bottom component 7 and / or lid component 8) of the packaging bag 1.

In the Fig. 3 bicomponent filaments for a weldable spunbonded nonwoven 2 are shown. At the in the Fig. 3a The embodiment of the bicomponent filaments shown outweighs the proportion of the core component 10 in comparison to the sheath component 9. The filler in the form of calcium carbonate is in the bicomponent filaments in accordance with Fig. 3 contained exclusively in the jacket component 9, which corresponds to the lower melting plastic component. The bicomponent filaments according to Fig. 3a are particularly suitable for spunbonded nonwovens 2, which form the side wall 5 of a packaging bag 1.

In contrast, the bicomponent filaments have according to Fig. 3b a much higher proportion of the jacket component 9 or the lower melting Plastic component. The filler is also preferred here and in the exemplary embodiment is contained exclusively in the jacket component 9. The bicomponent filaments according to Fig. 3b are particularly suitable for spunbonded nonwovens 2 or for spunbonded nonwoven areas that have to be welded. For this purpose, the jacket component 9 with the lower melting plastic component provides sufficient welding material. The welding is preferably carried out with the proviso that the jacket component 9 is only or essentially melted or welded. The bicomponent filaments are therefore suitable Fig. 3b especially for the base component 7 to be welded and / or for the cover component 8 to be welded of a packaging bag 1 according to the invention.

The mass ratio of the lower melting plastic component (jacket component 9) to the higher melting plastic component (core component 10) may be in the embodiment Fig. 3a 20:80. In contrast, in the embodiment according to Fig. 3b the mass ratio of the lower melting plastic component (jacket component 9) to the higher melting plastic component (core component 10) to 40:60.

Claims (6)

1. Packaging, in particular packaging bag (1), preferably for receiving pourable and/or free-flowing products such as cement and the like, comprising at least one spun-bonded nonwoven (2) or packaging spun-bonded nonwoven, characterized in that the spun-bonded nonwoven (2) or packaging spun-bonded nonwoven comprises continuous filaments (3) of thermoplastic material,

   that either the continuous filaments are monocomponent filaments and comprise at least 3 wt.%, preferably at least 4 wt.% of at least one filler (4) for improving the weldability of the spun-bonded nonwoven (2) - in particular for reducing the welding temperature during thermal welding of the spun-bonded nonwoven (2) -

   or that the continuous filaments (3) are formed from multicomponent filaments, in particular as bicomponent filaments and that a plastic component arranged on the surface of the multicomponent filaments or bicomponent filaments comprises at least 3 wt.%, preferably at least 4 wt.% of at least one filler (4) for improving the weldability of the spun-bonded nonwoven (2) - in particular for reducing the welding temperature during thermal welding of the spun-bonded nonwoven (2)

   and that the spun-bonded nonwoven/packaging spun-bonded nonwoven forms the packaging wall and/or is part of the packaging wall and wherein sections of the spun-bonded nonwoven/packaging spun-bonded nonwoven in the side wall region and/or in the bottom region and/or in the top region of the packaging or the packaging wall are welded together.
2. The packaging according to claim 1, characterized in that the spun-bonded nonwoven/packaging spun-bonded nonwoven is part of a packaging wall laminate and wherein the laminate further preferably comprises at least one film, preferably a plastic film.
3. The packaging according to claim 2, characterized in that the film or plastic film is arranged on the inner side of the packaging wall.
4. The packaging according to one of claims 1 to 3, characterized in that the side wall (5) of the packaging comprises at least one spun-bonded nonwoven (2), wherein the spun-bonded nonwoven (2) contains bicomponent filaments having a core-sheath configuration and wherein the mass ratio of the core component (10) to the sheath component (9) is 10:90 to 35:65, preferably 15:85 to 35:65 and preferably 20:80 to 30:70, very preferably 20:80 to 25:75.
5. The packaging according to one of claims 2 to 4, characterized in that at least one top component (8) or at least one flat top component (8) is part of the packaging wall, wherein the top component comprises at least one spun-bonded nonwoven (2), wherein the spun-bonded nonwoven (2) contains bicomponent filaments having a core-sheath configuration and wherein the mass ratio of the core component (10) to the sheath component (9) is 35:65 to 50:50, preferably 40:60 to 45:55.
6. The packaging according to one of claims 2 to 5, characterized in that at least one bottom component (7) or at least one flat bottom component (7) is part of the packaging wall, wherein the top component comprises at least one spun-bonded nonwoven (2), wherein the spun-bonded nonwoven (2) contains bicomponent filaments having a core-sheath configuration and wherein the mass ratio of the core component (10) to the sheath component (9) is 35:65 to 50:50, preferably 40:60 to 45:55.

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