DE102021125078A1 - Packing Pad Strips - Google Patents

Abstract

In the case of a cushion strand consisting of a formed section of a single- or multi-ply starting paper web (2), which has two longitudinal edges (3) extending in the direction of the web, a particularly first and/or front end edge (7, 9 ) and a wave-shaped embossing area (5) extending parallel to the longitudinal edges (3) in web direction (B), which in particular has embossing peaks (51) and embossing valleys (53) and optionally punched perforations (55), as well as two opposite ones has tubular padding sides (4) extending in the web direction (B) and adjoining the embossing area transversely to the web direction (B), it is provided that the padding strip shrinks by at least 13% in relation to the starting paper web (2), in particular at least 20%, preferably at least 22%.

Description

The invention relates to a strand of padding as well as a piece of padding consisting of a formed section of a single- or multi-ply starting paper web, which comprises two longitudinal edges extending in the direction of the web and a corrugated embossed area extending parallel to the longitudinal edges in the direction of the web, as well as two opposite, tubular upholstery sides adjoining the embossing area transversely to the direction of the web and extending in the direction of the web. Furthermore, the invention relates to a cushioning material forming device for forming a single-ply or multi-ply starting paper web into a strand of padding or a piece of padding.

The paper web can be single-ply or multi-ply. The material of the paper web can be, for example, kraft paper or recycled paper, in particular made from recycled waste paper, cardboard or cardboard. The use of recycled paper is preferable due to its special environmental friendliness. The paper web can be provided as a supply, for example as a wound roll, in particular as a sleeveless roll, or a leporello stack. The length of the paper web is preferably substantially, i.e. at least 10, 50 or 100 times greater than the width of the paper web. The thickness of the paper web corresponds to the thickness of the single or multi-ply paper material and is preferably less than one millimeter.

The material of the paper web is made in particular from recycled paper. Recycled paper is, in particular, paper material with a small proportion (less than 50%) of paper material containing fresh fibers. In particular, paper materials containing 70% to 100% waste paper are preferred. The recycled paper can preferably be paper material which can have a tensile strength index along the web direction of at most 90 Nm/g, preferably a tensile strength of 15 Nm/g to 60 Nm/g and a tensile strength index transverse to the web direction of at most 60 Nm/g, preferably a tensile strength of 5 Nm/g to 40 Nm/g. A standard DIN EN ISO 1924-2 or DIN EN ISO 1924-3 can be used to determine the tensile strength or the tensile strength index. Additionally or alternatively, a recycled paper property or waste paper property can be characterized by the so-called bursting resistance. A material in this sense is recycled paper with a burst index of at most 3.0 kPa*m^2/g, preferably with a burst index of 0.8 kPa*M^2/g to 2.5 kPa*mA2/g. The DIN EN ISO 2758 standard is used to determine the bursting index. Furthermore, the material of the paper web has a mass per unit area of in particular 40 g/m 2 to a maximum of 140 g/m 2 . According to the invention, the starting material of the paper web can be present in the form of a roll of web material or a zigzag-folded stack of packaging material, which is also referred to as a leporello stack.

DE 690 30 410 T2 describes a dunnage product for use as packaging or wrapping material which is formed with lateral, pillow-like sections and a central connecting section running the length of the product. The product is formed from a three-ply web of stock material, typically provided in a 76.2 cm [30 inch] wide roll. The edges of a stock material are rolled inwardly to form pillow-like sections connected along their touching, abutting sides by embossed sections. In addition, perforations are provided in the connecting section, which are intended to prevent the connecting section from being dissolved or separated. The cushioning product is 20 to 23 cm [8 to 9 inches] wide with the central portion being at least 3.8 cm [1 1/2 inches] wide and about 1.3 to 1.9 cm [1/2 to 3/4 inches] high. The pillow-like sections are approximately 5.1 to 6.4 cm [2 to 2½ inches] wide.

A cushioning material product also describes GB2501260 A. According to this, a web of paper material with side edges rolled up several times is drawn in under tension by pressing gears in order to be partially pressed by them.

In the cushioning material product thus manufactured, the rolled up side edges of the web of paper material are included in the indented area. In this way, a stable cushioning material product is to be manufactured which is to have sufficient volume with the least possible longitudinal shrinkage in comparison to the starting web of paper material.

Out of DE 10 2012 018 941 A1 a packaging product is known which is formed from a paper web material by folding over longitudinal edge strips and introducing a succession of embossing valleys and embossing peaks in a central region of the web. The folded longitudinal edge strips form hollow cushions on both sides of the central area, which extend in the longitudinal direction. Slit perforations are provided on the short sides of the packaging product, which form slit edges which mutually interlock under different layers of paper web sections. The central area remains free of perforations, to avoid damaging the paper web plies and thereby weakening the packaging product. Such a packaging product is about 30 cm long and 16 cm wide. The packaging product formed in this way is particularly dimensionally stable, particularly in the area of the lateral crumple cavities, which primarily provide the elastic restoring forces of the packaging product.

For small packages, traditional packaging products or cushioning products have proven unsuitable. For the desired cushioning stability, conventional products require minimum dimensions that are too large for small packages. When the products manufactured in a known manner are reduced in size to below the minimum dimensions of a width of approximately 16 cm and a length of approximately 30 cm, it has been found that the intended cushioning properties are lost.

It can therefore be seen as an object of the invention to overcome the problems of the prior art, in particular to provide a particularly compact cushioning material, such as a cushioning strand or a cushioning piece, and a cushioning material forming device, with a high cushioning effect being ensured and with in particular the padding material is not too soft and/or not too hard.

Accordingly, a cushion strand is provided, consisting of a shaped section of a single- or multi-ply starting paper web. The padding strand has two longitudinal edges extending in the direction of the web and a particularly first and/or front end edge that delimits the padding strand in the web direction. It should be understood that the web direction may correspond to a direction in which the original paper web is conveyed into or through a cushioning material forming device, or an elongate original paper web. For example, the starting paper web can be wound up into a roll. The web direction then corresponds to the tangential direction to the roll in the area of the starting material removed from the roll. Additionally or alternatively, the web direction, in relation to the padding strand, can correspond to the direction in which the padding strand is conveyed in a cushioning material forming device or out of the cushioning material forming device. The strand of padding also includes a wavy embossed area that extends parallel to the longitudinal edges in the direction of the web. The embossing area includes, in particular, embossing peaks and embossing valleys and possibly punched perforations. Provision can be made for the embossing area to have a multiplicity of alternating embossing peaks and embossing valleys. Furthermore, the pad strand comprises two opposite tubular pad sides, in particular transverse to the web direction, adjoining the embossing area transverse to the web direction and extending in the web direction. Advantageously, immediately adjoining tubular padding sides are provided on both sides of the embossed area. Optionally, the cushion sides can be essentially the same size. The size of the upholstery sides along the length of the upholstery strip in the direction of the web is preferably essentially constant, it being clear that in the case of an irregular upholstery shape the equality of the upholstery sides must be within a tolerance range of <±2 cm, in particular <±1 cm in relation to the respective upholstery tube Average radius can be determined. The embossing area is preferably of the same size in the direction of the web, preferably within a tolerance range of ±1 cm or less, in particular ±0.5 cm or less. Alternatively or additionally, the padding area can have a crumple height of at least 5 mm, in particular at least 10 mm, preferably at least 15 mm, particularly preferably at least 20 mm, and/or not more than 50 mm, preferably not more than 40 mm, particularly preferably not is more than 30 mm.

According to the invention, it is provided that the cushion strand has a degree of shrinkage of at least 13% or at least 15%, in particular at least 20%, preferably at least 22%, in relation to the starting paper web. Surprisingly, it has been found that, contrary to the common prejudice that increasing shrinkage can lead to poorer padding quality, especially for short or compact padding strands or padding pieces, a very high padding effect can be guaranteed by the padding sides because there is greater softness in this area can be provided than in the embossing area, which essentially accommodates the compaction. In particular, it has been found that too small a degree of shrinkage, particularly for compact or small padding pieces and strands, can lead to padding products that are too soft and cannot provide adequate shock absorption properties for the safe transport of goods to be transported.

The cushioning properties can be determined, for example, by placing the cushioning material on a flat, substantially non-deforming surface, such as a metal plate. Then the upholstery material is loaded flat. According to a first alternative, it can be measured which restoring force the pad opposes to the surface load. According to a second alternative, it can be measured by which deformation path the cushioning material is compressed under a predetermined surface load, in particular a reference force in relation to the loaded reference cushioning surface.

According to a preferred embodiment of a cushioning strand, the degree of shrinkage relates to a shortening of the cushioning material strand in the web direction in relation to an initial length of the initial paper web in the web direction. It should be understood that the shrinkage dimension does not refer to a cross-web narrowing of the dunnage strand or piece in relation to an initial width of the initial paper web in a cross-web direction. Since folds or rolls are formed transversely to the web direction to form the tubular padding sides, the person skilled in the art understands that transversely to the web direction considerable changes between the width of the starting paper web and the cushion strand formed from it are always provided. The degree of shrinkage preferably designates a relation between an initial length of the initial paper web and a corresponding length of padding material in the same web direction. Preferably, the amount of shrinkage denotes the relation of the cushion length to the initial length along the embossed area.

The invention also relates to a cushion strand consisting of a formed section of a single-ply or multi-ply starting paper web, which has two longitudinal edges extending in the direction of the web, a particularly first and/or front end edge that delimits the cushion strand in the web direction, and a parallel to the Longitudinal edges in web direction extending wavy embossed area includes. The wavy embossing area has, in particular, embossing peaks and embossing valleys and optionally punched perforations. The pad strand comprises two mutually opposite, tubular pad sides adjoining the embossing area transversely to the direction of the web and extending in the direction of the web.

According to the invention, the padding strand has a strand width of not more than 12 cm, in particular not more than 10 cm, transversely to the web direction. This very much smaller padding strand width than known from the previous state of the art, allows for the first time the use of generic padding strands from the formed section of a starting paper web with opposite tubular padding sides that laterally enclose a central embossed area, also for small transport containers, in which currently frequently plastic-based upholstery material is used. Contrary to the prejudice that padding material based on a starting paper web with a width of no more than 12 cm is impossible to produce without losing the desired padding properties, a particularly compact padding material that still provides a high padding effect has been achieved for the first time.

According to a preferred embodiment of the invention, the longitudinal edges are each formed by a rolled-up winding section of the starting material web, with the starting material web preferably being in one layer. In particular, the longitudinal edges are each formed by a single rolled-up winding section. In addition, it will alternatively be provided that the longitudinal edges are formed by a simply rolled-up winding section (with no more than one turn). Surprisingly, it has been found that for compact strands or pieces of padding, the use of rolled wrap sections is preferable. In the prior art, great care is often taken to ensure that the longitudinal edges are formed by multiple times rolled, folded and / or folded winding sections of the starting material wall, because according to a common prejudice it is assumed that the use of multiple layers and / or windings should be absolutely necessary in order to set the desired padding properties as safe. It has turned out, however, that this assumption is based on the widespread inability to ensure reliable and continuous embossing stabilization of the mutually opposite tubular padding sides, even if it has to be ensured that only a single and/or simple winding layer is to be stabilized. It should be clear that the cushion strand according to the invention or the cushion strands described below are free of glue or other chemical and/or physical adhesion promoters for attaching different layers and/or sides of the starting paper webs to one another.

In a preferred embodiment of the invention, it is provided that in the embossing area at least one winding section, in particular both winding sections lying opposite one another transversely to the web direction, of the starting material web is held in four layers at least in transverse sections. In this embodiment, the starting paper web is preferably single-ply. The four-layer holding of the winding section of the starting material web can be achieved by providing at least two layers of a first winding section that is on the right or left, transversely with respect to the web direction; in that a further layer in the embossing area is further provided by the central area of the starting paper web; and in that at least one further layer is also provided by paper of the starting paper web from a section, for example a second winding section, opposite to the first winding section with respect to the starting paper web middle region. Alternatively, both the first, right winding ab Section and the second, left winding section provide at least two layers and the middle area of the starting paper web a fifth layer, which are connected to each other in the embossing area. It can be particularly preferred that the right winding section and the left winding section have at least one concave fold and/or flap formed by a transverse collision with the opposite winding section, which can provide further layers in sections in the embossing area, which can be attached to one another by embossing . For example, in the embossing area, a section-wise nine-layer mounting of a padding strand or piece based on a single-layer starting paper can be preferred. The embossing area can have a deformation area width that is at least 10 mm, in particular at least 15 mm, preferably at least 20 mm, and/or not more than 50 mm, in particular not more than 35 mm, preferably not more than 30 mm, particularly preferably not is more than 25 mm. The embossing area height of the embossing area can relate to the height between the respective pair of embossing peaks and embossing valleys, in particular a pair of adjacent embossing peaks and embossing valleys.

According to a preferred development of the invention, a tab of a first, for example, right winding section is received in a concave fold of a second, for example, left winding section in the embossing area. According to another preferred development, which can be combined with the previous one, at least one tab can be folded in against itself in the embossing area.

The invention also relates to a piece of padding comprising a strand of padding formed as described above. The piece of padding has a second, in particular rear, end edge. A dunnage strand generally refers to a continuous coherent band made from a deformed portion of an initial paper web. A piece of upholstery can be separated from a strand of upholstery, for example by a cutting tool such as a rotary blade, guillotine, by manual tearing along a preferably toothed blade or the like, with the process of separating a piece of upholstery from a strand of upholstery leading to the formation of the piece of upholstery and a new strand of upholstery.

The cushioning piece preferably consists of a reshaped section of a single- or multi-ply paper web. The piece of padding has, in particular, two longitudinal edges extending in the web direction, a first and/or front end edge delimiting the padding strip in the web direction, and a second and/or rear end edge. It is understood that the first end edge faces the second end edge in the web direction. The length of the piece of padding can be determined from end edge to end edge. The piece of padding also includes a wavy embossed area that extends essentially parallel to the longitudinal edges in the direction of the web. The embossed area of the piece of padding comprises at least one embossed crest and/or at least one embossed valley. The embossed area of the piece of padding can optionally have at least one punched perforation. The piece of padding comprises two opposite tubular padding sides adjoining the embossed area transversely to the direction of the web and extending in the direction of the web.

In relation to an initial length of the initial paper web, the padding piece can have a padding piece length with a degree of shrinkage of at least 13% or at least 15%, in particular at least 20%, preferably at least 22%. Additionally or alternatively, the padding piece has a piece width of not more than 12 cm, in particular not more than 10 cm, transversely to the web direction. Once a piece of padding is formed from a strand of padding, it may be preferred that the piece width of the piece of padding corresponds to the strand width of the strand of padding.

According to a particularly preferred embodiment of a padding piece according to the invention, the piece width is greater than the piece length. It should be understood that the piece length designates the extent of the padding piece in the web direction and the piece width designates the extent of the padding piece transversely to the web width. The length of the piece preferably refers to the extension of the piece of padding along the embossed area. The piece width of a piece of padding can refer to the transverse extent of the piece of padding, which extends over the opposite tubular padding sides and the embossed area provided between them. It can be preferred that the piece width is determined according to the direction of flank extension of the embossing peaks and/or valleys.

In the past, the guiding principle was that for a sufficient padding material quality it was absolutely necessary to always provide a piece length of padding pieces in the web direction along the embossed areas, which was greater than the piece width of the corresponding padding piece. With the piece of padding according to the invention, however, a stable and high-quality padding quality can also be achieved for those pieces of padding in which the piece width is greater than the piece length, for example at least twice as large, at least three times as large, or at least four times as large. By providing particularly short pieces of upholstery with a small piece length, in this way for the first time special provide small generic padding pieces formed from two tubular padding areas and an embossing area provided therebetween. In view of the possible short piece lengths that can be achieved, the padded tubes are correspondingly short on the side of the embossing area and approach a ring shape, the winding diameter of which, contrary to the prior art, is no longer smaller than the piece length but can be the same size, in particular even larger.

According to a preferred embodiment of an upholstery piece according to the invention, the upholstery piece has a length of no more than 30 cm or no more than 25 cm, in particular no more than 15 cm, preferably no more than 10 cm or no more than 5 cm, particularly preferably no more than 3 cm.

Additionally or alternatively, the piece of padding has a piece length of at least 1.5 cm or at least 2 cm, in particular at least 5 cm, preferably at least 8 cm. Additionally or alternatively, the piece of padding has a piece width of at least 4 cm or 5 cm, in particular at least 8 cm, preferably at least 10 cm. The padding width can particularly preferably be in a range from 7 cm to 10 cm, particularly preferably in the range from 8 cm to 9 cm.

According to a particularly preferred embodiment of a padding piece, the padding piece consists of a section of a single-ply starting paper web. It should be understood that the term "section" in relation to the separation of a piece of padding from a starting paper web also applies to pieces of padding that have been severed by a method other than cutting, such as tearing.

The invention also relates to a padding material forming device for forming a single-ply or multi-ply starting paper web into a padding material in the form of a padding strand or a padding piece, as described above.

According to a preferred embodiment of an upholstery material forming device, this comprises at least one embossing device for shaping the embossing area, with the embossing device in particular comprising a perforation device for making punched perforations in the upholstery material, in particular in the area of an embossing area formed by the embossing device, preferably exclusively in the embossing area. The embossing device can preferably be designed in such a way that it forms a padding material from a padding material starting paper web, which padding material is formed on both sides of a central embossing area with tubular padding sides extending in the web direction. The emboss area may be formed by incorporating a plurality of emboss ridges and emboss valleys into the cushioning material.

In a preferred embodiment of a padding material forming device, this comprises at least one preforming station for rolling up the winding sections lying opposite one another transversely to the web direction of the starting paper web. The preforming station and the embossing device are matched to one another in such a way that the rolled-up winding sections abut one another transversely to the direction of the web in an infeed area of the embossing device. The entry area of the embossing device can have a width corresponding to a toothed wheel width of the embossing device. Alternatively, the run-in area can be wider than the gear wheel width. The lead-in region may have a longitudinal extent that is upstream in the web direction from a point of engagement where the outer peripheral curves of the intermeshing embossing tools come into contact with one another, counter to the web direction for a length which is no greater than the radius of an embossing straight line, preferably no greater than half the radius.

According to a preferred development of a cushioning material forming device, the embossing device comprises two intermeshing embossing rollers. In particular, the embossing rollers comprise a number of axial segments. In particular, at least one embossing roller has at least one punching segment arranged adjacent to at least one embossing segment in the axial direction for making punched perforations in the embossing area. In particular, at least one embossing roller comprises a punching segment arranged between two embossing segments in the axial direction for making punched perforations in the embossing area. Both embossing rollers preferably each have at least one axial embossing segment in order to introduce punched perforations into the embossing area.

According to another preferred development, the embossing rollers can have outer axial segments in the axial direction, which have an at least partially rounded transition from the axial end face to the peripheral face. A rounded transition is preferably provided, in particular only on the teeth, preferably only in the area of the tooth tips. In particular, the transition can be completely rounded. It has been shown that such embossing rollers are particularly suitable to prevent tearing of the thin, single-ply starting material web and thus to be able to guarantee a high padding material quality even with a small padding width and/or length.

According to another development of a padding material-forming device according to the invention, this comprises a take-off device, which communicates a conveying speed to the starting paper web that is or can be arranged in the supply of starting material, with the take-off device in particular being arranged in front of the embossing device in the conveying direction and/or being provided separately from the embossing device. In particular, the embossing device and the take-off device for relieving the strain on the starting paper web in the area of the embossing device and/or possibly in the infeed area are matched to one another, preferably synchronized.

According to a further embodiment of a cushioning material forming device, it can be provided that the cushioning material forming device has a receptacle for the supply of starting material of the starting paper web, in particular the starting paper web in the form of a preferably coreless roll.

In a preferred embodiment of a cushioning material forming device, the cushioning material forming device has a separating device arranged immediately behind the embossing device in the conveying direction for separating pieces of padding from a cushion strand and, if necessary, a removal device arranged directly behind the separating device for gripping separated pieces of padding. It can be preferred that the conveying direction corresponds to the web direction.

• 1 ein erfindungsgemäßes Polsterstück;
• 2 eine schematische Darstellung einer erfindungsgemäßen Polstermaterial-Umformvorrichtung;
• 3 eine schematische Darstellung der erfindungsgemäßen Polstermaterial-Umformvorrichtung gemäß 2;
• 4 eine schematische Schnittansicht durch einen erfindungsgemäßen Polstermaterialstrang bzw. ein erfindungsgemäßes Polsterstück;
• 5a eine Draufsicht auf ein Polsterstück;
• 5b eine Draufsicht auf ein aufgerolltes und entfaltetes Polsterstück aus einer einzigen Lagenausgangs-Papierbahn;
• 6 einen schematischen Messaufbau zum Bestimmen;
• 7 eine Ausführung einer Polstermaterial-Umformvorrichtung; und
• 8 eine andere Ansicht der Polstermaterial-Umformvorrichtung gemäß 7.

Preferred embodiments of the invention are specified in the subclaims. In the following description of preferred embodiments with reference to the accompanying figures, particularly preferred embodiments of the invention are presented, in which:

• 1 an upholstery piece according to the invention;
• 2 a schematic representation of a cushioning material forming device according to the invention;
• 3 according to a schematic representation of the padding material forming device according to the invention 2 ;
• 4 a schematic sectional view through a strand of upholstery material according to the invention or an upholstery piece according to the invention;
• 5a a plan view of a piece of padding;
• 5b a plan view of a rolled up and unfolded piece of padding from a single layer starting paper web;
• 6 a schematic measurement setup for determining;
• 7 an embodiment of a cushioning material forming device; and
• 8th another view of the cushioning material forming device according to FIG 7 .

In the following descriptions of preferred embodiments of the invention, the same or similar reference numbers are used for the same or similar components to simplify readability.

A piece of padding according to the invention is generally indicated by the reference numeral 1 . A cushioning material conversion apparatus in accordance with the present invention is generally designated by the reference numeral 100 . The padding piece consists of a piece of a single-ply starting paper web, two longitudinal edges 3 extending in the web direction, a front end edge 7 and a rear end edge 9 opposite the front end edge 7. The padding piece has a central wavy embossed area extending in the web direction B 5 and on each side of the embossing area an adjoining tubular padding side 4 extending transversely to the web direction. The embossing area has a large number of embossing regions 51 and embossing valleys 53 and, if necessary, punched perforations 55.

The padding piece 1 is formed by dividing, preferably cutting or tearing off, a padding strand which was formed from a web-shaped paper starting material in a padding material forming device 100 . The strand of upholstery material differs from the piece of upholstery 1 essentially in that the piece of upholstery has a certain length t of padding, whereas the strand of upholstery has Although it has a front end 7, it merges in the cushioning material forming device 100 counter to the conveying direction F into the endless or quasi-endless starting material 2.

The embossing area 5 is formed in the conveying direction F and the web direction B corresponding thereto in relation to the conveying direction F through the padding material forming device. The cushion length t is defined in the web direction B from the front end 7 to the rear end 9 of the cushion piece 1 .

Transversely to the direction B of the web, the piece of padding has a piece width b, which generally corresponds to the width of the strand. In the transverse direction, the piece of padding 1 can be divided into the central embossing area 5 and the padding sides 4 provided on both sides of the embossing area 5. In the area of the padding sides 4, the starting paper web 2 is formed into a tubular shape. The tubular shape is realized by a winding section 23 or 24, which is formed starting from the longitudinal edge of the starting material web by wrapping inwards. The padding piece 1 has a right winding section 23, a left winding section 24 and the central embossing section 5. The padding piece 1 has been formed from a single-ply starting paper web 2. In the area of the winding sections 23, 24, the piece of padding 1 is predominantly in two layers. In the embossing area 5, the piece of padding 1 has at least four layers, with at least the right or left winding section 23, 24, an opposite longitudinal wall end 25, 26 and the winding area 28 of the starting paper web lying one on top of the other.

Adjacent to the embossing area 5, there are three-layer areas in the cushion sides 4, in which the tucked-in longitudinal wall edge 25 or 26 is arranged in the winding 23 or 24.

The embossing area 5 is formed by embossing regions 51 and embossing valleys 53 that are alternately introduced into the padding strip or padding piece 1. Embossing regions 51 and embossing valleys 53 can be introduced, for example, by an embossing device 105 of the cushioning material forming device 100, which can be used, for example, by intermeshing Embossing rollers can be formed. Punched perforations 55 can also be introduced in the embossing area 5, which completely or partially penetrate the cushion strand or the cushion piece 1 transversely to the direction of the web. The punched perforations serve to frictionally connect the several layers of the starting material web 2 arranged in the embossing area 5 to one another in order to prevent or at least make it more difficult for the cushion strand or the cushion piece 1 to unfold.

The cushioning material forming device 100 can have a preforming station 103 upstream of the embossing device 105 . The preforming station 103 can include a funnel-shaped inlet and/or a central guide, e.g. a guide plate and/or guide rods. The web material is guided through the preforming station 103 in the conveying direction F, with the longitudinal edges 25 and 26 of the starting material web 2 being wound inward transversely to the web direction B, so that the windings 23 and 24 are formed.

The embossing device 5 and the preforming station 103 are preferably coordinated with one another in such a way that the preforming station 103 presses the winding sections 24 and 25 against one another in a single hole area 104 at the entrance of the embossing device 105 . By pushing the winding sections 23 of the single-ply starting paper web 2 against each other, concave folds 24 are formed in the embossing area 5 in the winding section 24 where the opposite winding section 23 presses against the aforementioned winding section 24 so that it collapses radially. A tab 23a of the second winding section 23 can press transversely against an outer side of the first winding section 24 and form a concave fold 24a in this winding section 24 . The fold 24a forms an additional double layer.

Additionally or alternatively, tabs 23a, as in the examples in 1 shown, are urged to collapse against themselves by the resistance of the opposing wrap section 24. A flap 23a can be folded in against itself. Just like a concave fold 24a, a flap 23a folded in on itself also forms an additional double layer in the embossed area 5.

It should be clear that in the web direction B along the embossing area 5 a multiplicity of tabs 23a, in particular tabs 23a folded in against themselves, as well as concave folds 24a can be formed in a random sequence. At least 5, at least 10 or at least 20 concave folds 24a and/or flaps 23a folded in on themselves can be formed along a unit length of 1 m along the embossing strand. Continuous tabs 23a and/or folds 24a are formed along the piece of padding 1 or the padding strand in web direction B at least along 30%, preferably at least along 50%, in particular at least along 75% or along the entire length of the embossed area 5. On In this way, a multi-layer structure can be formed in the area 5 from a single-layer starting paper web 2, which ensures a particularly stable padding material from a single-layer starting paper web.

The cushioning material reshaping device can be provided with a take-off device 101 which is designed and set up to remove the starting paper web 2 from a receptacle 102 and to convey it into the cushioning material reshaping device 100 ( 2 and 3 ). It can be preferred that the pull-off device 101 and the embossing device 105 are matched to one another in such a way that the paper starting material 2 is strain-relieved in the area of the infeed 104 or the embossing device 105 .

A separating device 109, e.g. a guillotine, can be provided downstream of the embossing device 105 and a removal device 101 provided in the conveying flow direction F behind the separating device 109, which grips the individual padding pieces 1 and ejects them from the padding material forming device.

The features disclosed in the above description, the figures and the claims can be important both individually and in any combination for the implementation of the invention in the various configurations.

4 shows a schematic cross-sectional view of a padding strand or piece 1 according to the invention. The padding piece 1 has a padding width b in the range of about 8 cm to 9 cm. The tubular upholstery cushions on the upholstery sides 4 on the opposite sides of the upholstery piece 1 are formed into coils 23,24. The cushion sides 4 have a crumple height x in the range from about 20 mm to about 30 mm. The thickness d in area 5 is much smaller than the crumple height x. The thickness d is preferably in the range <10 mm, in particular <5 mm. The thickness d can be determined, for example, in the area of a reversal point either of the Polstertal or of the Polsterberg. The width z of the deformation area 5 is preferably in the range from 20 mm to about 25 mm. At least one of the padding sides 4 has a greater transverse width than the deformation width z of the embossing area 5. Both the right padding side 4 and the left padding side 4 preferably have a larger crumple area width than the deformation area width z. The width of the crumple area on the left-hand padding side 4 and the right-hand padding side 4 are preferably essentially the same size. The width of the crumple area can particularly preferably correspond to the height x of the crumple area.

The 5a and 5b serve to illustrate the determination of the cushion length t and the corresponding paper web length t _ex . Both the pad length t and the paper web length t _ex must always be measured in the middle of the embossing area 5 . The shrinkage dimension S can be determined using the following formula: $$S=1-\frac{t}{tex}.$$

6 illustrates a measurement setup 200 for determining cushioning properties. In this case, the padding material 1 is placed on a flat, essentially deformation-free surface 201, such as a wooden or metal plate. Then the padding material 1 is loaded flat. According to a first alternative, it can be measured which restoring force the pad counteracts with the surface load. According to a second alternative, it can be measured by which deformation path the cushioning material is compressed under a predetermined surface load, in particular a reference force in relation to the loaded reference cushioning surface. In the following tables, Table A shows measurement results for various upholstery materials according to the invention made from a paper material web with a grammage of 70 g/m ² (Table A; hereinafter "cushion A") and a grammage of 90 g/m ² (Table B; hereinafter "cushion B”). The paper web materials have a web width of 350 mm. In the initial state, cushion A has a cushion height of approx. 33 to 34 mm, cushion B a cushion height of approx. 34 to 36 mm.

For the measurement, an initial height ho corresponding to the crumple height x of an unloaded upholstery material is first determined. For this purpose, the crumple height x is measured on a light, loosely lying flat support plate 203 in the unloaded initial state. For example, a mean value can be determined from measurements at 4 measuring points. A 100 mm × 270 mm large, approx. 4 mm thick plate, e.g. made of dimensionally stable corrugated cardboard, can be used as a support plate.

Then h1 is determined: To do this, the test load 205 is placed on the support plate 203 and loaded for 10 seconds. Then the height is measured again at the same measuring points and from this a With value h1 determined. Then h2 is determined: The test load is removed from the support plate 203, waits 10 seconds and the height is measured again at the same measuring points and the mean value is determined as h2. Then the restoring force can be determined.

The following tables A and B show that the resilience of pad B is greater than that of pad A. The pad springs back after the load has been applied. There is not a large scatter in the cushion heights. With pad A, increasing plastic deformation can be observed at higher test loads. With cushion B, the restoring effect is essentially independent of the test load.

7 shows a side sectional view of the cushioning material forming device 100 with an embossing gear pair 105, which consists of two embossing rollers 120, 130, which mesh with one another and roll on one another. The paper material web, not shown in detail, is according to the figure from the right in the conveying direction F promoted by the preforming device 9 to the embossing gear pair 105 . The upholstery product, not shown in detail, is released in the conveying direction F from the embossing gear pair 105 . A frame supports the pair of embossing gears 105 and the preforming device 103.

8th shows a sectional top view of the padding material forming device 100. The paper material web, not shown in detail, is brought in the conveying direction F through the preforming device 9 to the embossing roller pair 120, 130. The preforming device 103 comprises a preforming funnel 93 and guide rods 91 lying opposite one another and converging in the conveying direction F. The preforming device 103 is designed and set up for the purpose of guiding the outer longitudinal edges of the paper material web, which are opposite one another transversely to the web direction and which is moved through the preforming device 9 in the conveying direction F, to hit or catch up inwards. The guide rods 91 are used to guide the rolled or folded longitudinal sections of the paper material web. The subsequent transverse width of the upholstered product transversely to the conveying direction F is essentially defined by the preforming device 9 .

The embossing roller 120 is composed of segments, namely outer segments 221 and middle segments 241. The embossing roller 120 also includes punching segments 231, which can be formed as stamping and/or sealing segments. The segments are constructed like disks and have a respective axial width. Although in the preferred embodiment shown the various disc segments are each formed in one piece, according to an alternative embodiment one or more of the illustrated segments could be formed in multiple parts, for example by several discs lying axially one on top of the other. The sealing gear 120 shown here as an example is made up of a first edge segment 221, a first sealing segment 231, three middle segments 241, a second sealing segment 231 and a second edge segment 221 in the axial direction A.

The pair of embossing rollers 120, 130 is designed and set up to introduce alternating embossing peaks and valleys in a central region of the preformed web of paper material and, if necessary, to form punchings around the upholstery product. A transition 128 is provided on each embossing roller from the circumferential surface 124 formed by tooth tips to the axial outer side surface 129, which in the present embodiment is formed by a radius, the radius being in the range from 1 mm to 20 mm, preferably in the range from 2 mm to 10 mm lies.

The features disclosed in the above description, the figures and the claims can be important both individually and in any combination for the implementation of the invention in the various configurations.

Reference List

1

upholstery piece

2

exit paper web

3

long edge

4

upholstery side

5

embossing area

7

final edge

9

final edge

23

winding section

23a

tab

24

winding section

24a

wrinkle

25, 26

long edge

28

midrange

51

embossing hill

53

embossing valley

55

die-cut perforation

91

senior management

93

preform funnel

100

Padding Material Forming Device

101

trigger device

102

stock of feedstock

103

preform station

104

inlet area

105

embossing device

120

embossing roller

124

peripheral surface

128

crossing

129

face

130

embossing roller

200

measurement setup

201

surface

203

support plate

205

test load

221

embossing segment

231

punching segment

241

embossing segment

A

axial direction

B

web direction

b

strand width / piece width

t

piece length

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 69030410 T2 [0004]
• GB2501260 [0005]
• DE 102012018941 A1 [0007]

Claims (19)

Padding strand consisting of a formed section of a single- or multi-layer starting paper web (2), the two longitudinal edges (3) extending in the web direction (B), a particularly first and/or front end edge delimiting the padding strand in the web direction (B). (7, 9) and a wave-shaped embossed area (5) extending parallel to the longitudinal edges (3) in web direction (B), which in particular has embossed peaks (51) and embossed valleys (53) and optionally punched perforations (55), and has two opposite tubular padding sides (4) adjoining the embossing area transversely to the web direction (B) and extending in the web direction (B), characterized in that the padding strand has a shrinkage of at least 13%, in particular at least 20%, preferably at least 22%. Padding strand consisting of a formed section of a single- or multi-layer starting paper web (2), the two longitudinal edges (3) extending in the web direction (B), a particularly first and/or front end edge delimiting the padding strand in the web direction (B). (7, 9) and a wave-shaped embossed area (5) extending parallel to the longitudinal edges (3) in web direction (B), which in particular has embossed peaks (51) and embossed valleys (53) and optionally punched perforations (55), and has two opposite tubular padding sides (4) adjoining the embossed area (5) transversely to the web direction (B) and extending in the web direction (B), characterized in that the padding strand transversely to the web direction (B) has a strand width (b) of no more than 12 cm, in particular no more than 10 cm. Upholstery strand after one of Claims 1 or 2 , characterized in that the longitudinal edges (3) are each formed by one, in particular a single and/or simply, rolled-up winding section (23, 24) of the starting material web (2). Upholstery strand after one of Claims 1 until 3 , characterized in that in the embossing area (5) at least one winding section (23, 24), in particular both winding sections (24, 23) of the starting material web (2) lying opposite one another transversely to the web direction (B), are held in four layers at least in transverse sections. Upholstery strand after claim 4 , characterized in that in the embossing area (5) a tab (23a) of a first winding section (23) is accommodated in a concave fold (24a) of a second winding section (24). Upholstery strand after claim 4 or 5 , characterized in that in the embossing area (5) at least one tab (23a) is folded in against itself. Upholstery piece (1) comprising an upholstery strand according to one of the preceding claims, characterized by a second, in particular rear, end edge (9), the upholstery piece (1) having a piece length (t) in the web direction (B) and a piece width (b) transversely to the web direction (B). Upholstery piece (1) after claim 7 , characterized in that the piece width (b) is greater than the piece length (t). Upholstery piece (1) after claim 7 or 8th , characterized in that the piece of padding (1) has a piece length (t) of no more than 30 cm or no more than 25 cm, in particular no more than 15 cm, preferably no more than 5 cm, particularly preferably no more than 3 cm , and/or wherein the piece of padding (1) has a piece length (t) of at least 1.5 cm or at least 2 cm, in particular at least 5 cm, preferably at least 8 cm. Upholstery piece (1) according to one of Claims 7 until 9 , characterized in that the piece of padding (1) has a piece width (b) of at least 4 cm, in particular at least 8 cm, preferably at least 10 cm. Upholstery piece (1) according to one of Claims 7 until 10 , characterized in that the piece of padding (1) consists of a section of a single-ply starting paper web (2). Padding material forming device (100) for forming a single-ply or multi-ply starting paper web (2) into a padding material in the form of a padding strand according to one of Claims 1 until 7 and/or an upholstery piece (1) according to one of Claims 7 until 11 . Upholstery material forming device (100). claim 12 , characterized in that the padding material forming device (100) comprises at least one embossing device (105) for forming the embossing area, wherein in particular the embossing device (105) comprises a perforation device for making punched perforations (55) in the padding material. Upholstery material forming device (100). Claim 13 , characterized in that the padding material forming device (100) comprises at least one preforming station (103) for rolling up the winding sections (23, 24) lying opposite one another transversely to the web direction (B) of the starting paper web (2), the preforming station (103) and the embossing device (105) are matched to one another in such a way that the rolled-up winding sections (23, 24) abut against one another in an entry area (104) of the embossing device (105) transversely to the web direction (B). Upholstery material forming device (100). Claim 13 or 14 , characterized in that the embossing device (105) comprises two intermeshing embossing rollers (120, 130), in particular the embossing rollers (120, 130) comprising a plurality of axial segments (221, 231, 241), in particular at least one embossing roller (120) at least has a punching segment (231) arranged adjacent to at least one embossing segment (221, 241) in the axial direction for making punched perforations (55) in the embossing area (5) and/or wherein in particular at least one embossing roller (120) has a embossing segment ( 221, 241) arranged punching segment (231) for making punching perforations (55) in the embossing area (5). Padding material forming device (100) according to one of Claims 13 until 15 , characterized in that the embossing rollers (120) have outer axial segments (221, 231, 241) in the axial direction, which have a transition (128) from the axial end face (129) to the peripheral face (124) that is rounded in particular over the entire circumference. Upholstery material forming device (100) after Claim 13 until 16 , characterized in that the padding material forming device (100) has a receptacle (102) for a stock of starting material of the starting paper web (2), in particular starting paper web in the form of a preferably coreless roll. Upholstery material forming device (100). Claim 17 , characterized in that the cushioning material forming device (100) comprises a take-off device (101) which communicates a conveying speed to the starting paper web (2) arranged in a supply of starting material, the take-off device (101) in particular being upstream of the embossing device in the conveying direction (F). (105) is arranged, in particular the embossing device (105) and the take-off device (101) for relieving the strain on the output paper web (2) in the area of the embossing device (105) and/or in the infeed area (104) are matched to one another, preferably synchronized, are. Upholstery material forming device (100) after Claim 13 until 18 , characterized in that the padding material forming device (100) has a separating device (109) for separating pieces of padding (1) from a cushion strand, which is arranged directly behind the embossing device (105) in the conveying direction (F) and optionally a separating device (109) immediately behind the separating device (109) arranged removal device (107) for gripping severed padding pieces (1).

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