DE102008046894A1 - Ventilation insert with statistically random cell distribution - Google Patents

Abstract

A ventilation insert for placement in or on textiles, comprising a carrier layer (1) and a cover layer (2), wherein between the carrier layer (1) and the cover layer (2) a material swellable under liquid absorption material (3) in particle form and / or fiber form in Cells (4) is, in view of the task, a ventilation insert in such a design and further education, that this has a relatively small thickness with high flexibility after cost-effective production and includes the swellable material captive, characterized in that the cells (4) form a layer (5), in which the swellable material (3) is received encapsulated in such a way that seals the layer (5) swollen when swellable material (3).

Description

Technical area

The The invention relates to a ventilation insert for arrangement in or on textiles, comprising a carrier layer and a Cover layer, wherein between the carrier layer and the cover layer a swellable under liquid absorption material in particulate form and / or fibrous form is incorporated in cells.

State of the art

A ventilation insert of the type mentioned is already known from the prior art. The DE 10 2006 042 145 B3 shows a ventilation insert, which consists of seven layers. Three layers form a core element, which is enclosed on both sides by two further functional layers.

The Core element has two air permeable layers, the include a swellable material. By the other functional layers become the air-permeable Layers of the core element compressed in partial regions, creating a chamber structure of regular chambers is created. For this purpose, injection molded functional are functional Used layers in which regularly shaped Recesses are formed.

The Production of such a ventilation insert is expensive and expensive. On the one hand, considerable efforts have to be made to produce the functional layers by injection molding, On the other hand, a total of seven layers must be joined together be a usable ventilation insert manufacture.

Of Another disadvantage is that for the formation of the chamber structure be used as functional layers of metal or plastic mesh, whose mesh size is limited. In particular, it is disadvantageous that the generic ventilation use due to its Structure has a high height and relatively stiff and inflexible. These properties are particular disadvantageous if the ventilation insert sewn in textiles or to be glued.

Presentation of the invention

Of the Invention is therefore the object of a ventilation insert of the type mentioned above to design and develop, that this cost-effective production a relative has low thickness with high flexibility and the swellable Includes material captive.

The The present invention accomplishes the aforementioned object the features of claim 1.

After that the ventilating insert mentioned in the introduction is characterized the cells form a layer in which the swellable material is so encapsulated is added that the layer in swollen swellable Material seals.

According to the invention It has been recognized that a serviceable ventilation insert can be formed from a carrier layer and a cover layer, which include a layer in which cells are formed are. The cells are designed such that the swellable Material mainly captive encapsulated in the cells is included. The encapsulated intake of the swellable Material in the cells allows the cells to close upon swelling of the swellable material. The layer can then as a separate functional element the sealing function fulfill. The ventilation insert needed no separate grids and elaborate injection molding constructions, to control the swelling of the swellable material so that a seal against air and water through the Ventilation insert is given. The creation of cells in one layer according to the invention allows the production thin and very flexible ventilation inserts, which consists of only three layers, namely the carrier layer, consist of the layer and the cover layer. Thus, the ventilation insert after cost-effective production easily in textiles are processed.

consequently the task mentioned at the beginning is solved.

The carrier layer and / or the cover layer could be designed as nonwoven, nonwoven or textile or could be configured as nonwovens, nonwovens or textiles, wherein the cells form a layer and wherein the sizes of the cells are statistically randomly distributed. The use of nonwovens, nonwovens or textiles allows a particularly flat construction of the ventilation insert and makes it easily deformable. The statistically random distribution of the sizes of the cells ensures that the cells are distributed with a very high uniformity between the carrier layer and the cover layer. As a result, defects are effectively avoided. The statistically random distribution of the sizes of the cells also creates microscopic-sized cells. By cells of microscopic extent, the reaction time of the encapsulated absorbed in the cells swellable material and thus the time to seal by the ventilation insert is greatly reduced. Furthermore, it is realized that very small quantities source capable material can be absorbed encapsulated in the cells. As a result, a fast kinetics is realized, which causes a fast response of the swellable material to liquid. This creates a dynamic porosity of the ventilation insert, which is characterized by a rapid sealing against liquid passage and a quick drying in the absence of moisture.

Of the geometric construction of the cells could be random. One The random geometric structure of the cells surprisingly shows a very fast liquid distribution in the layer, in which the cells are located. By the statistically random Distribution of the sizes or the extent of the cells in combination with their random buildup occur capillary effects on, leading to a very rapid distribution of the liquid within the shift.

The Carrier layer and the cover layer could by a Layer be connected to each other, wherein the layer at least partially consists of a binder. Against this background is concretely conceivable that both the cover layer and the carrier layer are made of a nonwoven or nonwoven fabric. The binder connects the cover layer with the carrier layer captive and closes the swellable material captive encapsulated between the carrier layer and the cover layer. It is conceivable that the swellable material is homogeneous mixed with the binder or in agglomerated form with the powdered binder is combined and on the Carrier layer is stored. After placing the cover layer then the binder can be heated so that this melts. After cooling the binder are the carrier layer and the cover layer are joined together and are in particulate form and / or fiber form present swellable materials encapsulated in cells.

In front this background could be the walls of the cells at least partially consist of the binder. Through this concrete Design is ensured that the swellable Materials are attached to the walls of the cells. One Trickling out of the swellable material from the ventilation insert is thereby effectively avoided.

The Walls of cells could make the layer reticulate build up. Due to the net-like structure is the ventilation insert given a high flexibility. The ventilation insert can be rolled up or bent without the layer breaking. The net-like configuration also leaves surprisingly a non-destructive expansion of the ventilation insert to.

The Binder could be used as a thermoplastic polymer compound be designed. Thermoplastics can be melted without difficulty and can be cohesive with other substances Make connections.

The swellable material could contain superabsorbers. Superabsorbents are characterized by the fact that they can bind a large amount of liquid. In paragraph 15 of the DE 10 2006 042 145 B3 are called swellable materials that can be used in particulate form or in fiber form in the ventilation insert described herein.

The Swellable material could be with the binder form at least partially agglomerated particles. This will the application of the swellable material on the carrier layer facilitated. Furthermore, the amount of swellable Material can be reduced. This allows a relatively small weight increase be achieved with fluid intake.

The Cover layer could be made hydrophilic. Through this Concrete design ensures that water is on the cover layer homogeneously distributed and evenly can penetrate into the cells. This will be a uniform Swelling of the swellable material realized. The uniform Swelling leads to a uniform Sealing over the entire surface of the ventilation insert or over the entire surface of the cover layer.

The hydrophilic treated cover layer further serves as Diffusion layer, namely the horizontal distribution of the penetrating water, so that the subsequent layer evenly is acted upon by the penetrating water. Furthermore is the cover layer responsible for ensuring that in the swellable Material evaporate stored water as quickly as possible can. This is achieved by adding water through capillary action and concentration gradients are transported to the outside and thus evaporates.

The Carrier layer could be made hydrophobic. This ensures that water stored in the cells and swollen, moist swellable material the carrier layer is retained and not with the body of the wearer of a textile product comes into contact. As a result, the wearing comfort of textile products, in particular shoes, through effective air exchange and drainage moisture due to perspiration significantly improved.

Against this background, the ventilation insert could have a dry air permeability of at least 200 dm ³ / (m ² s), preferably of at least 600 dm ³ / (m ² s) at a pressure differential have a limit of 200 mbar between inflow side and outflow side. These values have proved to be particularly advantageous in order to create a good wearing comfort in humans when wearing textile products.

Of the Ventilation use could add a drying time Room temperature of at most 20 minutes, preferably from not more than 10 minutes, in which the mass of the ventilation insert is reduced by at least 400%. Surprisingly shows the ventilation insert described here with statistical random distribution of the sizes of the Cells this very short drying time. The carrier of a textile product, which with the ventilation insert described here is equipped, therefore, after soaking of the product only a few minutes on a breathable and breathable need to dispense textile product.

Of the Ventilation insert described here could be especially preferably be arranged in or on a shoe. The statistically randomly formed cell structure ensures that the encapsulated absorbed swellable material spatially limited. This is the ventilation insert Compatible with the passage of air and moisture. The swelling of the swellable material is surprisingly mainly in the horizontal direction. The air permeability in the dry state is surprisingly much higher as the air permeability known Wasserdampfdurchlässiger Membrane systems. Therefore, the wearing comfort of shoes is clear improved.

In front This background is conceivable that the shoe with a water repellent Upper or membrane shoe, namely with waterproof film or water vapor permeable membrane is made. Of the Installation of a ventilation insert described here causes a pleasant wearing climate through good ventilation of the shoe in use. Only closes when water enters from the outside the ventilation insert immediately the air inlet opening and seals against the incoming water. The swelling of the swellable material in the spatially limited Cells cause a reduction in the porosity of the ventilation insert to almost zero%. In addition to the moisture absorption and the permanent Sealing by the ventilation insert at entry of Moisture it is crucial that the porosity or the air permeability of the ventilation insert in the absence of moisture penetrate as quickly as possible regenerated. It is desired that the porosity as quickly as possible reaches the value of the ventilation in the dry state shows. This behavior becomes dynamic porosity called and takes place in the ventilation insert described here reversible without changing the physical properties of the ventilation insert.

So far Here is the question of cells, it is irrelevant whether the cells closed or open. Similar to a foam layer For example, the layer comprising the cells may be open-celled or closed-celled be designed.

It Now there are different ways of teaching the present To design and develop the invention in an advantageous manner. This is on the one hand to the subordinate claims, on the other hand to the following explanation of preferred embodiments of the invention with reference to the drawing.

In Connection with the explanation of the preferred embodiments The invention with reference to the drawings are also generally preferred Embodiments and developments of the teaching explained.

Brief description of the drawing

In show the drawing

1 a schematic sectional view of a ventilation insert,

2 a diagram showing the drying behavior of ventilation inserts, and

3 a diagram showing the air permeability of ventilation inserts in the wet and in the dry state.

Embodiment of the invention

1 shows a ventilation insert for placement in or on textiles, comprising a carrier layer 1 and a cover layer 2 , wherein between the carrier layer 1 and the cover layer 2 a swellable under liquid absorption material 3 in particulate form in cells 4 encapsulated is included. The cells 4 form a layer 5 from, in which the swellable material 3 encapsulated in such a way that the layer 5 with swollen swellable material 3 seals. The seal causes a gas flow or a liquid flow from the cover layer 2 to the carrier layer 1 or through the carrier layer 1 prevented or reduced.

The carrier layer 1 and the cover layer 2 are designed as nonwovens, wherein the cells 4 a layer 5 form and where the sizes of the cells 4 statistically randomly distributed. The geometric structure of the cells 4 is random. With the cells 4 are not regularly constructed geometric bodies such as octahedron or cuboid, but to open-cell or closed-cell intermediate spaces through walls 6 are separated from each other.

The carrier layer 1 and the cover layer 2 are through the layer 5 connected to each other, wherein the layer is made of a binder. The walls 6 the cells 4 consist of binder and build the layer 5 reticulate. The binder is designed as a thermoplastic polymer compound.

The swellable material 3 contains superabsorbent. The cover layer 2 is hydrophilic and allows a homogeneous horizontal distribution of penetrating from the outside in the direction of arrow water in the layer 5 , The shorter arrow indicates that the water has passed through the cover layer 2 from the swellable material 3 is absorbed. By absorbing the penetrating water swells the swellable material 3 open and close the cells 4 , The layer 5 seals off. The larger arrow shows schematically that air in the dry state through the cover layer 2 , the layer 5 and carrier layer 1 can pass through.

The carrier layer 1 is hydrophobic and prevents ingress of water or swollen, moist swellable material can contact the support of a textile product.

Of the Just described ventilation insert can according to the Embodiments be constructed in the following manner:

Embodiment 1

The carrier layer 1 consists of a hydroentangled nonwoven fabric made of polyester, which has a basis weight of 100 g / m ² . This nonwoven fabric is hydrophobic. The binder consists of a polyethylene powder having a mean particle size of 200-400 microns. The polyethylene powder is sold by Sabic under the name Sabic LDPE 1695 Z. The swellable material 3 consists of a superabsorbent powder with a mean particle size of 80 to 160 microns. The superabsorbent powder is sold by Sumitomo Seika Chemicals Co. under the name Aqua Keep 10 SH-MB 3 distributed.

The polyethylene powder and the swellable material 3 are mixed homogeneously and on the carrier layer 1 applied. Thereafter, the cover layer 2 to the homogeneous mixture of swellable material 3 and binder applied. The cover layer 2 consists of a hydroentangled nonwoven fabric made of polyester with a basis weight of 100 g / m ² . The cover layer 2 is hydrophilic. By a thermal lamination of carrier layer 1 and cover layer 2 the binder is melted and become the cells 4 generates, which the swellable material 3 encapsulated.

Embodiment 2:

The carrier layer 1 consists of a hydroentangled nonwoven fabric made of polyester, which has a basis weight of 100 g / m ² . This nonwoven fabric is hydrophobic. The binder consists of a polyethylene powder having a mean particle size of 200-400 microns. The polyethylene powder is sold by Sabic under the name Sabic LDPE 1695 Z. The swellable material 3 consists of a superabsorbent powder with a mean particle size of 80 to 160 microns. The superabsorbent powder is sold by Sumitomo Seika Chemicals Co. under the name Aqua Keep 10 SH-MB 3 distributed.

The polyethylene powder is applied to the carrier layer in a regular pattern 1 applied. The swellable material 3 is placed in spaces of the pattern that are not covered with polyethylene powder. Thereafter, the cover layer 2 on the swellable material 3 and the binder applied. The cover layer 2 consists of a hydroentangled nonwoven fabric made of polyester with a basis weight of 100 g / m ² . The cover layer 2 is hydrophilic. By a thermal lamination of carrier layer 1 and cover layer 2 the binder is melted and become the cells 4 generates, which the swellable material 3 encapsulated.

2 shows a diagram in which the mass change of two wet ventilation inserts according to Embodiment 1 is plotted against time in minutes. The mass change is given as a percentage. At a room temperature of 18 to 25 ° C both ventilation inserts show a drying time of at most 20 minutes, preferably of at most 10 minutes, in which the mass of the ventilation inserts is reduced by at least 400%. In the diagram according to 2 Two measurements are taken, which are almost congruent. The first measurement was carried out on a first ventilation insert, the second measurement on a second ventilation insert according to embodiment 1. 2 vividly documents the high dynamic porosity of the ventilation inserts. Furthermore occupied 2 in that the ventilation inserts are reversibly wettable and dryable.

3 shows a diagram in which the air permeability of four different ventilation inserts (Nos. 1 to 4 plotted on the x-axis) is shown in the dry and in the wet state. All four ventilation inserts were analogous to Ausfüh Example 1 manufactured and showed a thickness of 1.1 mm. 3 shows that the examined ventilation inserts in the dry state show an air permeability of at least 200 dm ³ / (m ² s), preferably of at least 600 dm ³ / (m ² s), with a pressure difference between the upstream side and outflow side of 200 mbar. The measurement of air permeability was according to DIN EN ISO 9237 carried out.

Regarding further advantageous embodiments and developments of the teaching of the invention on the one hand to the general part of the description and on the other hand to the attached claims.

Finally be particularly emphasized that the previously selected Embodiments for discussion only serve the teaching of the invention, but these do not limit to these embodiments.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 102006042145 B3 [0002, 0017]

Cited non-patent literature

• - DIN EN ISO 9237 [0044]

Claims (14)

Ventilation insert for placement in or on textiles, comprising a carrier layer ( 1 ) and a cover layer ( 2 ), wherein between the carrier layer ( 1 ) and the cover layer ( 2 ) a swellable material with liquid absorption ( 3 ) in particle form and / or fiber form in cells ( 4 ), characterized in that the cells ( 4 ) a layer ( 5 ) in which the swellable material ( 3 ) is encapsulated in such a way that the layer ( 5 ) with swellable swellable material ( 3 ) seals. Ventilation insert according to claim 1, characterized in that the carrier layer ( 1 ) and / or the cover layer ( 2 ) is configured as a nonwoven, nonwoven fabric or textile, wherein the cells ( 4 ) a layer ( 5 ) and the sizes of the cells ( 4 ) are statistically randomly distributed. Ventilation insert according to claim 1 or 2, characterized in that the geometric structure of the cells ( 4 ) is random. Ventilation insert according to one of claims 1 to 3, characterized in that the carrier layer ( 1 ) and the cover layer ( 2 ) through the layer ( 5 ), wherein the layer ( 5 ) at least partially consists of a binder. Ventilation insert according to claim 4, characterized in that the walls ( 6 ) of the cells ( 4 ) consist at least partially of the binder. Ventilation insert according to claim 5, characterized in that the walls ( 6 ) of the cells ( 4 ) the layer ( 5 ) network-like. Ventilation insert according to one of claims 4 to 6, characterized in that the binder as a thermoplastic Polymer compound is designed. Ventilation insert according to one of claims 1 to 7, characterized in that the swellable material ( 3 ) Contains superabsorbent. Ventilation insert according to one of claims 4 to 8, characterized in that the swellable material ( 3 ) forms at least partially agglomerated particles with the binder. Ventilation insert according to one of claims 1 to 9, characterized in that the cover layer ( 2 ) is made hydrophilic. Ventilation insert according to one of claims 1 to 10, characterized in that the carrier layer ( 1 ) is designed hydrophobic. Ventilation insert according to one of claims 1 to 11, characterized by an air permeability in the dry state of at least 200 dm ³ / (m ² s), preferably of at least 600 dm ³ / (m ² s), at a pressure difference of 200 mbar between upstream side and downstream. Ventilation insert according to one of claims 1 to 12, characterized by a drying time at room temperature of at most 20 minutes, preferably at most 10 min, in which the mass of the ventilation insert reduced by at least 400%. Shoe with a ventilation insert after one of the preceding claims.