DE202017101271U1 - Banderole for forming a tubular casing as a handling aid, such a tubular casing and a filter unit with handling aid - Google Patents

Abstract

Banderole for forming a tubular casing on a product, wherein the band is formed from a thin-walled planar approximately rectangular sheet having two opposite end portions end portions, wherein at least one end portion on one side of the sheet is provided with a heat-activated adhesive such that an adhesive strip is formed.

Description

The present invention relates to a band for forming a tubular sheath, a tubular sheath as a handling aid and a filter unit with handling aid.

Dialyzers, as the central interchangeable blood purification unit, are the heart of dialysis machines that serve kidney replacement therapy by hemodialysis or hemodiafiltration. In medical jargon, they are also called "filters" for short and are used once.

In principle, a mass transfer takes place in dialyzers in such a way that they flow through the blood and the dialysis fluid, with both media being separated from one another by a semipermeable (= semipermeable) membrane.

The so-called capillary dialyzer is the most commonly used type of dialyzer. Other theoretically possible designs, such. As the plate dialyzer, however, are practically no longer used due to various disadvantages.

Similar to the principle of the tube bundle heat exchanger, the capillary dialyzer consists of a housing in which a large number of up to 18,000 hollow fibers (length of 20 to 30 cm) are arranged in parallel. This filter surfaces are achieved by up to 2.3m ² . The blood flow is guided in the fibers. The outer space is largely traversed by the dialysate parallel to the hollow fibers. This flows to increase the effectiveness of the mass transfer in countercurrent to the blood.

The wall of the hollow fibers, which have a diameter of 190 .mu.m to 300 .mu.m with a wall thickness of 30 .mu.m to 40 .mu.m, is formed by the semipermeable membrane, which is permeable to water and substances dissolved therein up to an average molecular size, for the blood cells and larger protein molecules, such as. B. albumin, however, not.

The semipermeable membranes are used to transport the dissolved substances into the blood and dialysate, either by selective diffusion or convection. The ultrafiltration, ie the transport of water from the blood to the dialysate, is generated by applying a pressure difference across the membrane. This pressure difference, the so-called transmembrane pressure, is composed of the static pressure difference between blood and dialysate and an osmotic pressure, which is essentially due to the differences in the concentration of albumin on both sides of the membrane.

In the DE 295 14 414 U1 discloses a system for testing and packaging tested dialysis filters. The dialysis filters are bundled plastic monofilaments, which are surrounded by a filter jacket made of plastic film.

From the EP 1 344 542 B1 go out a dialyzer and a method for its preparation. The dialyzer comprises a substantially cylindrical housing, a hollow fiber bundle formed of a plurality of hollow fiber membranes disposed in the housing (1).

The object of the present invention is to provide a banderole for forming a tubular casing for products, in particular for dialysis filters, as well as such a tubular casing as a handling or as a production aid for bundling products and a corresponding filter unit with such a handling aid, which is easy to manufacture and safe and reliable in use.

This object is achieved with the features of the claims 1, 7 and 9. Advantageous embodiments are specified in the subclaims.

According to the invention, a banderole for forming a tubular casing for products, in particular for dialysis filters, is provided, wherein the banderole is formed from a thin-walled planar approximately rectangular sheet having two opposite end portions, wherein at least one end portion on one side of the sheet with a heat-activatable adhesive is provided such that an adhesive strip is formed.

By means of the banderole according to the invention, a banderole for forming a tubular casing for a product, in particular a dialysis filter, is provided, which enables a simple forming of the casing on the product. In addition, the product can be given by the wrapping a dimensional stability.

Under a dialysis filter frame of the present invention is understood to be formed from hollow fiber membranes hollow fiber bundle, as for example in the EP 1 344 542 B1 is described. Such hollow fiber membranes are usually shed frontally together, which gives the hollow fiber bundle a certain, but usually insufficient stability. The hollow fiber membranes of the hollow fiber bundle may be formed of polyamide.

Preferably, both end portions of the band can be on opposite sides the banderole be provided with the heat-activated adhesive.

By providing both end portions of the band on opposite sides of the band with the heat-activatable adhesive, it is possible to allow a safer and more efficient bonding of the two end portions to provide a sterile tubular sheath.

A partial or full-surface, one- or two-sided coating of a heat-activatable adhesive on the fabric used for Banderolen-production, regardless of any existing thermoplastic properties of the support material, in its bonding temperature and contact time, be adjusted individually by a corresponding chemical composition of the adhesive.

The amount of adhesive applied may be about 3 to 5 g / m ² . Such an adhesive layer may then have a layer thickness of approximately 2 to 5 μm.

A processing temperature of the heat-activatable adhesive may be in the range between 40 ° C and 110 ° C and preferably in the range between 70 ° C and 100 ° C or in particular between 70 ° C and 80 ° C.

By adapting the chemical composition of the heat-activatable adhesive, it is possible to settle the processing or the joining temperature in a range which does not lead to any thermal impairment of the capillary membranes or of the hollow-fiber membranes.

Normally, when using thermoplastic sheets which would be suitable for producing a band, the joining temperature determined by the material selection can not be significantly exceeded or exceeded.

The advantage of a partial or a locally limited application of a heat-activatable adhesive in the manner of a sealing strip, for example in the overlapping region of a joint connection, is that direct contact of the adhesive with the membrane material can be avoided. This can counteract the formation of harmful or allergenic reactions.

A partial or general use of a heat-activatable adhesive can also be advantageous in that the sliding properties of the fabric forming the band are not adversely affected. Thus, a banderole according to the invention in the longitudinal direction can be deducted from a dialysis filter.

In order to improve the sliding properties of the band can also be provided that a surface of the sheet is frosted or coated to reduce the frictional resistance. This will be explained in detail below.

The use of a heat-activatable sealant layer allows the use of non- or partially thermoplastic materials to make the banderole.

The sheet may be a plastic film formed of polyamide, polyester, polypropylene, polyurethane, high-density or low-density polyethylene or a textile or metallic material or paper.

Such a sheet may preferably be dimensionally stable and / or transparent or translucent, (partially light-transmissive, but not transparent) or semitransparent.

The sheet for forming a band can be stackable, since the one or more adhesive strips not independently, but preferably by heat input, stick together. If the adhesive strip (s) stick together on their own by contacting with each other, this fact must be taken into account during processing.

According to a further aspect of the present invention, a tubular casing for a product is provided, which is formed from a band. The banderole is formed according to the above embodiments of a thin-walled planar sheet and has a longitudinally extending overlap region, in which two radial end portions of the sheet are connected to each other by means of a heat-activated adhesive.

In this way, a tubular wrapper is provided as a handling aid for products, particularly dialysis filters, which is easy and safe to handle, offering mechanical protection and some dimensional stability as well as contamination protection.

Such a band can then be withdrawn from the dialysis filter like a tube in the longitudinal direction.

The inventors of the present invention have recognized that the hollow fiber membrane, or the The hollow fiber bundle forming the dialysis filter is sensitive to excessive heat (from approx. 110 ° C.).

Characterized in that the processing temperature of the heat-activatable adhesive in the range between 60 ° C and 100 ° C and preferably in the range between 70 ° C and 80 ° C, there is no damage to the hollow fiber bundle when activating the heat-activated adhesive by heat input.

The heat input can be effected by means of a heating element, a heating stamp, an infrared radiator, a hot air blower or the like.

Such a heating element can simply be placed on the overlap area virtually without pressure or pressure after wrapping the dialysis filter from the outside.

According to a further aspect of the present invention, a filter unit is provided, which comprises a dialysis filter and a tubular sheath concentrically surrounding the dialysis filter according to the invention.

Such a tubular enclosure for products can also be provided, for example, for food. It may be advantageous here that it is sufficient to activate the heat-activatable adhesive with residual heat contained in the food. Foods may contain residual heat due to various factors, for example, by sterilization or UHT or simply by the preparation process of the product.

• Coronabehandeln eines dünnwandigen ebenen Flächengebildes und
• Bereichsweises Aufbringen eines wärmeaktivierbaren Klebstoffes auf das Flächengebilde, um zumindest einen Klebestreifen auf dem Flächengebilde auszubilden.

A method for producing a banderole, for example as explained above, comprises the following steps:

• Corona treatment of a thin-walled planar structure and
• Application of a heat-activatable adhesive to the sheet area-wise to form at least one adhesive strip on the sheet.

Prior to applying the heat-activatable adhesive to the sheet, matting or coating of the sheet may occur to reduce the frictional resistance of at least one surface of the sheet.

Furthermore, a cutting of the fabric after the application of the adhesive may be provided to form corresponding Banderolenbögen.

The application of a heat-activatable adhesive to the fabric may, for example, be done in such a way that a base material, such as e.g. a film is passed over a printing press to apply the adhesive layer.

Such a printing press has at least one printing roller, which is e.g. is designed as a color or Klebffütterungswalze to apply to a front and a back of the sheet in one operation adhesive.

In this case, only a small use of material adhesive is necessary because it is applied only in strip form on the fabric.

The printing press can be designed for flexographic printing. This is a direct high pressure process. Flexographic printing is a web-fed rotary printing process using flexible printing plates made of photopolymer or rubber, with adhesive applied to the web in strip form.

In particular, in this case a chamber doctor blade system or an open doctor blade system can be used in which the excess adhesive is stripped with a doctor blade from a surface of an anilox roller. In this method, the adhesive is pumped into a chamber which presses tightly with air pressure to the anilox roller and contains the doctor blade.

Doctor blades are usually made of steel, variants are plastic doctor blade and ceramic coated steel doctor blade.

Alternatively, a diving roll printing unit can be used.

Thus, the adhesive does not have to be sprayed onto the fabric, but precise pre-metering of the desired amount of adhesive is achieved so that accurate metering and local application of the adhesive by means of printing is possible.

When matting matting usually cause a specific roughness of the surface, whereby the frictional resistance is reduced. As matting agents, it is also possible to use not only silicic acids and silicates but also polyethylene, polypropylene or copolymers.

In addition and / or as an alternative to matting, it is also possible to provide a coating to reduce the frictional resistance.

Corona treatment is an electrochemical process for surface modification of plastics. Some plastics have a non-polar, electrically well insulating and water-repellent surface. It is poorly wettable by printing inks, solvents, aqueous polymer dispersions, adhesives or adhesion promoters. This is especially true for polyethylene, polypropylene and polyester films. The printing of such plastics or coatings is therefore difficult. The adhesive would not or only badly adhere.

By corona treatment, the polarity of the surface of the fabric is increased, whereby wettability and chemical affinity are significantly improved.

The corona treatment is usually carried out in film production "in line" at the end of the manufacturing process. The film web is exposed to a high-voltage electrical discharge. This occurs between a grounded, polished steel or aluminum roller and a tight-fitting insulated electrode. Depending on the field of application, it is also possible to use an insulated roller against uninsulated electrodes. The film rests on the polished roller, so that only the side facing the electrode is treated. If an air gap occurs between the roller and the web, the back side is treated. The electrode is powered by a high-frequency generator with an AC voltage of 10 to 20 kV and a frequency between 10 and 60 kHz.

In particular, it may be provided that a corona work is arranged in front of the actual printing units in the printing press.

• Umhüllen eines Produktes, insbesondere eines einen Dialysefilter ausbildenden Hohlfaserbündels, mit einer Banderole, wobei die Banderole bzw. das Flächengebilde zwei einander gegenüberliegende Endbereiche aufweist, wobei zumindest ein Endbereich auf einer Seite des Flächengebildes mit einem wärmeaktivierbaren Klebstoff versehen ist und
• Verkleben der Endbereiche derart, dass eine den Dialysefilter konzentrisch umgebende Umhüllung ausgebildet wird.

A method for applying such a cover as a handling aid to a filter unit comprises the following steps:

• Enveloping a product, in particular a hollow fiber bundle forming a dialysis filter, with a banderole, the banderole or the fabric having two opposite end regions, wherein at least one end region on one side of the fabric is provided with a heat-activatable adhesive and
• Gluing the end portions such that a surrounding the dialysis filter concentrically enclosing enclosure is formed.

By this method using a banderole according to the invention, for example as explained above, neither the fabric nor the filter must be covered or otherwise protected during bonding.

Thus, the bonding is extremely clean because the adhesive used is not liquid.

The bonding can be carried out such that a contact or a contact of the adhesive strips forming end portions of the fabric is sufficient to bond them together. Such bonding must be taken into account in the manufacture, storage and transport of the bands.

For this purpose, a simple juxtaposition of the end regions or the adhesive strips are sufficient, so that no contact pressure is necessary. When pressing or pressing there is a risk that the dialysis filter forming hollow fiber bundle, in particular the hollow fibers is damaged.

Alternatively, the bonding by means of heat introduction in the region of the overlapping and preferably congruent arranged adhesive strips can be done such that in the overlap region, a suitable heating device is applied, by means of which the heat-activatable adhesive is applied at a temperature of 70 ° C to 110 ° C.

Thus, no high temperature is required so that a product such as e.g. a dialysis filter is protected from damage.

• 1: eine erfindungsgemäße Banderole zum Ausbilden einer schlauchförmigen Umhüllung zum Verpacken von Produkten in einer perspektivischen Darstellung, und
• 2: eine schlauchförmige Umhüllung zum Verpacken von Produkten, die aus einer in 1 dargestellten Banderole ausgebildet ist, in einer perspektivischen Darstellung.

The present invention will be described in more detail below with reference to FIGS. These show in

• 1 a banderole according to the invention for forming a tubular casing for packaging products in a perspective view, and
• 2 : a tubular wrapping for packaging products made from an in 1 formed banderole is formed in a perspective view.

According to the invention is a band 1 for forming a tubular sheath 2 intended for the packaging of products ( 1 and 2 ).

The band 1 is formed of a thin-walled planar approximately rectangular sheet. The sheet has two opposite end portions 3 on.

Preferably, both end regions 3 . 4 opposite sides of the band 1 with a heat-activated adhesive 5 coated.

According to a further but not preferred embodiment, only one end region may be used 3 be coated on one side of the sheet with the heat-activatable adhesive.

The coating with heat-active adhesive is preferably carried out over the whole in the longitudinal direction 6 extending length of the band 1 ,

The sheet may be polyester, polypropylene, polyurethane, high-density or low-density polyethylene or a metallic or textile fabric or paper.

Furthermore, according to the invention, a tubular sheath 2 intended for packaging products. The tubular casing 2 is provided by a dialysis filter with the band 1 is wrapped.

Such a cladding 2 serves as a handling aid in transport from production to the user and is then withdrawn in a longitudinal direction before or after insertion into a dialysis machine.

The two end areas 3 . 4 those with the heat-activated adhesive 5 are then substantially congruent and with their adhesive coated sides facing each other and form an overlap region 7 out.

Subsequently, in the overlapping area, a suitable heating device (not shown) is applied by means of which the heat-activatable adhesive is exposed to a temperature of 70 ° C. to 100 ° C.

In this way, a material-locking connection of the two end regions is provided.

Such a dialysis filter, which is surrounded by a tubular sheath, is referred to in the context of the present invention as a filter unit according to the invention.

The heat-activatable adhesive may comprise one or more of the following base polymers or resins or waxes and / or nucleating agents and / or stabilizers.

Base polymers:

• - PA (polyamides)
• - PE (polyethylene)
• - APAO (amorphous polyalphaolefins)
• - EVAC (ethylene-vinyl acetate copolymers) application temperature ~ 150 ° C
• - TPE-E (polyester elastomers)
• - TPE-U (polyurethane elastomers)
• TPE-A (copolyamide elastomers)
• - Vinylpyrrolidone / vinyl acetate copolymers, application temperature ~ 130 ° C, water-soluble

Resin:

• - rosin
• - terpenes
• - Hydrocarbon resins

stabilizers:

• - antioxidants
• - primary ("radical scavengers", eg phenols)
• - secondary (peroxide decomposer)

Wax:

• - naturally (beeswax)
• - synthetic (fully synthetic, partly synthetic, chemically modified)

nucleating agents:

Nucleating agents may be added to modify semi-crystalline plastics. They ensure that crystal formation occurs at a higher temperature. Thus, for example, polypropylene reduces cycle times by up to 30% and optimizes the crystal structure. Side effect is a stronger shrinkage.

Hot-melt adhesives, also known as hot-melt adhesives, hot-melt adhesives, hotmelt or hot-melt adhesives, are solvent-free and more or less solid at room temperature, which are applied to the adhesive surface when hot and produce a firm bond on cooling.

• - Wässriger Dispersionskleber bzw. eine Wässrige Dispersion eines Polymers auf Basis von Acrylsäureester, Methacrylsäureester, Copolymerisat (psa (pressure sensitive adhesive)) z.B. BASF: Acronal 3630 X^®
• - UV-vernetzender, Carboxylgruppenhaltiger Polyacrylsäure-n-butylester z.B. BASF: acResin DS 3500^®
• - Acrylat-Haftklebstoff z.B. LOCTITE DURO_TAK 788 EU^®
• - Aliphatisches Polyether-Polycarbonaturethan z.B. von CHT/BEZEMA Group Tubicoat PU 60^®
• - Hitzestabilisiertes Copolyamid z.B. Grilltex D 1549A^® Grilltex EMS^®
• - Copolyamid Schmelzkleber z.B. Grilltex D1550A^® Grilltex EMS^®
• - Low Density Polyethylen Harz z.B. Dow plastics: Polyethylene 780R oder 352L
• - Amorphous metallocene propylene-Ethylene-Copolymer Wax z.B. Licocene PP 1502^® oder 3602^®
• - Ethylen- Vinyl Acetate- Maleic Anhydride Terpolymer z.B. Orevac T 9307 Y^® oder Orevac T 9318^®
• - Thermoplastischer Copolyester z.B. Cepatex 110 VC^® oder Cepatex 183 HV^® ;Cepat AG

In particular, for example, one or more of the compounds listed below can be used as an adhesive:

• - Aqueous dispersion adhesive or an aqueous dispersion of a polymer based on acrylate, methacrylate, copolymer (PSA (Pressure Sensitive Adhesive)), for example, BASF Acronal ^® 3630 X
• - UV-crosslinking, carboxyl-polyacrylic acid-n-butyl ester as BASF: acResin DS 3500 ^®
• - Acrylic pressure-sensitive adhesive eg LOCTITE DURO_TAK 788 EU ^®
• - Aliphatic polyether polycarbonate urethane example of CHT / BEZEMA Group Tubicoat PU 60 ^®
• - Heat stabilized copolyamide eg Grilltex D 1549A ^® Grilltex EMS ^®
• - Copolyamide hot melt adhesive eg Grilltex D1550A ^® Grilltex EMS ^®
• - Low Density polyethylene resin eg Dow plastics: Polyethylene 780R or 352L
• - Amorphous metallocene propylene-ethylene copolymer wax such as Licocene PP 1502 ^® and 3602 ^®
• - ethylene-vinyl Acetate- Maleic Anhydride Terpolymer example Orevac T 9307 Y ^® or Orevac ^® 9318 T
• - Thermoplastic copolyester eg Cepatex 110 VC ^® or Cepatex 183 HV ^®; Cepat AG

Furthermore, hotmelt films or adhesives may also be suitable as adhesives. These are esterbasierend in the polyurethanes. The hotmelts further include copolyamides, copolyesters and polyolefins. Hotmelt films in particular replace conventional, liquid adhesives. They are solvent-free and therefore particularly environmentally friendly.

The activation of the hotmelt foils is done by heat, ultrasound or high frequency or by steam. Due to the energy input, hotmelt films become liquid and wet the fabric. The hardening and usage of the glue joint is done by cooling the hot melt within a few seconds.

• - Lösungsmittelfrei
• - präziser Flächenauftrag
• - gleichmäßige Benetzung
• - einfache Handhabung und leichte Arbeitsvorbereitung
• - prozeßsicher
• - schnelle Aktivierungs- und Abbindezeiten
• - kein Gefahrgut

Such hot melt adhesives have the following advantages:

• - Solvent free
• - precise surface application
• - uniform wetting
• - easy handling and easy work preparation
• - process-safe
• - fast activation and setting times
• - No dangerous goods

LIST OF REFERENCE NUMBERS

1

banderole

2

tubular casing

3.4

end regions

5

heat-activated adhesive

6

longitudinal

7

overlap area

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been 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.

Cited patent literature

• DE 29514414 U1 [0008]
• EP 1344542 B1 [0009, 0014]

Claims (9)

Banderole for forming a tubular casing on a product, wherein the band is formed from a thin-walled planar approximately rectangular sheet having two opposite end portions end portions, wherein at least one end portion on one side of the sheet is provided with a heat-activated adhesive such that an adhesive strip is formed. Banderole after Claim 1 , characterized in that both end regions are provided on opposite sides of the band with the heat-activatable adhesive such that two adhesive strips are formed. Banderole after Claim 1 or 2 , characterized in that a processing temperature of the heat-activatable adhesive in the range between 60 ° C and 110 ° C and preferably in the range between 70 ° C and 100 ° C and 80 ° C. Banderole after one of the Claims 1 to 3 , characterized in that the sheet is formed of a plastic film of polyester, polypropylene, polyurethane, high-density or low-density polyethylene or a cloth or paper. Banderole after one of the Claims 1 to 4 , characterized in that the adhesive strip (s) have an amount of applied adhesive of about 3 to 5 g / m ² . Banderole after one of the Claims 1 to 5 , characterized in that the one or more adhesive strips have an adhesive layer with a layer thickness of about 2 to 5 microns. Tubular wrapping for a product consisting of a banderole according to one of the Claims 1 to 4 wherein the envelope formed from a thin-walled flat sheet has a longitudinally extending overlapping area in which two radial end portions of the sheet are bonded together by means of a heat-activatable adhesive. Tubular sheath after Claim 7 , characterized in that the product is a dialysis filter. Filter unit comprising a dialysis filter and at least concentrically surrounding the dialysis filter tubular enclosure according to Claim 7 or 8th ,

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