BRPI0718859A2 - PROCESS FOR PREPARING A PANEL - Google Patents

Description

PROCESS FOR PREPARING A PANEL

The invention relates to a process for preparing a panel, specifically a panel comprising lignocellulose fibers or filaments.

Processes for preparing material panels

similar to straw are known, for example, from WO 01/32375. In this process, the binding of cereal straw in a panel is performed with urea formaldehyde resin (UF) or melamine formaldehyde resin (MUF) in combination with an acid straw treatment. This treatment is believed to alter or remove the wax or lipid layer surrounding the cereal straw. Treatment consists of applying either a strong or weak acid to the straw. This results in a drop in pH and straw buffering capacity which facilitates the binding of straw with UF or MUF in a heated plate press.

The known process has the disadvantage that treating straw with an acid is laborious and expensive and in addition the properties of the resulting panel are still unsatisfactory. It is known in the art that when the acid treatment step is omitted, the straw can only be effectively used in a panel in combination with an isocyanate resin. The use of such isocyanate resins for binding straw is expensive and special measures.

2 5 should be taken to prevent the panels from becoming

clump to the press.

The most economical use of resins to bind lignocellulose-containing filament-like material such as straw on a panel board has been attempted.

Water based resins had been tried for that purpose, but resulted in very low quality panels with low mechanical strength.

It is an object of the present invention to reduce or even eliminate the disadvantages.

This goal is achieved, so the process comprises

the step of treating the lignocellulose-containing filament-like material with a combination of UV radiation and ozone.

The invention may be characterized as follows. The invention relates to a process for the preparation of a panel comprising a lignocellulose-containing filament-like material comprising the following steps:

a) treatment of lignocellulose-containing filament-like material with the combination of UV radiation and

ozone, both in situ and ex si tu;

b) mixing the resulting product with an adhesive composition;

c) applying the resulting mixture to a lower press part, and

d) pressing and at least partially curing the composition obtained in step c) to obtain a panel.

The invention also relates to a Process according to claim 1 wherein the adhesive composition is a

2 5 water based resin.

The invention also relates to a Process according to claim 2 wherein the water based resin is selected from the group consisting of soybean, an aldehyde, and at least one component selected from the group consisting of

30 in urea, phenol and melamine, or mixtures thereof. The invention also relates to a Process according to claim 3 wherein the aldehyde is formaldehyde.

The invention also relates to a Process according to claim 1 wherein the adhesive composition is a waterless resin.

The invention also relates to a Process according to claim 5, wherein the non-water based resin is selected from the group consisting of soy, polyvinyl acetates, epoxy polyester and acrylics. The invention also relates to a process according to

claim 1-6, wherein the curing temperature is between 1.85 and 251.85 ° C.

The invention also relates to a process according to any one of claims 1-7, wherein the UV radiation has a wavelength between 1 and 385 nm, preferably below 310 nm, more preferably 254 nm.

The invention also relates to a process according to any one of claims 1-8, wherein the UV radiation has an intensity between 0.1 and 725 mW / cm2 preferably between 1 and 60 mW / cm2 even more preferably between 10 and 50 µm. mW / cm2.

The invention also relates to a process according to any one of claims 1-9, wherein the lignocellulose-containing material is a non-wood agricultural material.

The invention also relates to a process according to any one of claims 1-10, wherein the lignocellulose-containing material has a water content to full saturation.

The invention also relates to a process according to any one of claims 1-11, wherein the lignocellulose-containing material is natural straw.

The invention also relates to a process according to claims 1-12, wherein the adhesive composition is present in an amount between 1 and 30% by weight.

The invention also relates to a process according to any one of claims 1-13, wherein the adhesive composition is cured by at least 75%.

The invention also relates to a process according to any one of claims 1-14, wherein the lignocellulose-containing material is in the form of filaments which have been oriented prior to step d).

The invention also relates to a process according to any one of claims 1-15, wherein the curing of the composition is carried out at a temperature between 76.85 to 176.85 ° C.

The invention also relates to a process according to any one of claims 1-16, wherein the adhesive composition comprises an aldehyde and melamine.

The invention also relates to a process according to

any one of claims 1-17, wherein the aldehyde is formaldehyde.

The invention also relates to a panel obtainable by a process according to any one of claims 1-18.

The invention also relates to a panel according to claim 19, having mechanical properties according to Canadian Standard CSA 0437.0-93 Group 1 (FM).

The invention also relates to a Filament Frame

Oriented, Medium Density Fiberboard, High Density Fiberboard, Insulation Board or Particulate Board, obtained by a process according to any one of claims 1-13.

The invention also relates to an apparatus suitable for carrying out the process according to claims 1-13.

One object of the invention is to be achieved by providing a process for preparing a panel comprising the step of treating lignocellulose-containing filament-like material with a combination of UV radiation and ozone.

The term fiber, filament-like material or filament is used interchangeably herein to denote a material in the form of a filament, that is, having a length greater than width. Preferably, the length is 2, 3, 4, 8, 20, 50, 100 or even more times the width. An optimal filament length for a given combination of filament-like material and resin can easily be determined experimentally by one skilled in the art.

The term lignocellulose is used herein to denote any of several closely related substances constituting the essential part of plant woody cell walls and consisting of cellulose closely associated with lignin. The term more specifically refers to the combination of lignin, hemicellulose and cellulose that forms the structure of plant cell walls. Lignocellulose is therefore the term used to refer to the volume of plant material. It consists mainly of lignin, cellulose, hemicellulose and extractives. Woody biomass consists of about 45-50% cellulose, 20-25% hemicellulose and 20-25% lignin.

The phrase lignocellulose-containing filament-like material includes a filament mixture comprising from 10% by weight to 100% by weight of non-wood agricultural filaments. The term non-wood agricultural filaments as used herein means filaments of agricultural plants or their harvested / remnant products, said plants achieving a growth harvesting stage in two years or less. Such plants are as such widely known; Examples of such plants or their crop products include, but are not limited to grass, straw, reed, cane (sugar), bagasse, flax, hemp, kenaf, bamboo, cotton, cork, bark, sisal and sorghum. As is known, the filaments typically do not constitute the entire original plant, but instead a part thereof, typically the most fibrous part also known as bark. As is also known in the art, filaments 20 can be obtained after some processing steps have been performed on plants; The steps are not limited, but may include cutting, separation and drying.

A specific embodiment of the invention relates to a process for preparing a panel comprising lignocellulose-containing filament-like material, comprising the following steps:

(a) treating the lignocellulose-containing filament-like material with a combination of UV radiation and ozone;

b) mixing the resulting product with an adhesive composition;

c) application of the resulting mixture on a press bottom and

d) pressing and at least partially curing the composition obtained in step c) to obtain a panel.

This process can be applied to a wide variety of resins, specifically waterborne or waterborne resins, but also using waterborne or waterborne materials. A specifically advantageous adhesive composition is a water based or water inherent resin. Examples of such resins include soy, as well as a composition comprising an aldehyde, and at least one component selected from the group consisting of urea, phenol and melamine, or mixtures thereof. A specifically suitable aldehyde may be a formaldehyde.

One skilled in the art will be aware of the different curing modes of a specific type of resin.

The adhesive composition may also be a non-water based composition. Examples of such compositions include soy, polyvinyl acetates, epoxy polyester and acrylics.

The process according to the invention has the advantage that non-wood agricultural filaments such as straw are used. These types of filaments are renewable on a more frequent basis than wood, for example every

2 5 two years, annually or even more frequently. At the same

In time, a panel can be prepared that has good mechanical properties and is suitable for most, if not all applications where wood-based panels are in common use.

Within the context of the present invention, the term panel is understood to mean a sheet forming a distinct (generally flat) section or component of a material. Wood based panels such as wood chip panel, MDF, Particle Board or Oriented Filament Board (OSB) are well known in the art. In a preferred embodiment of the invention, the method as described above relates to the preparation of a panel wherein the panel is an OSB.

The method according to the invention may be used for the preparation of a panel as described above, wherein the lignocellulose-containing filament-like material comprises a mixture of different filaments. This may mean that the lignocellulose-containing filament-like material is heterogeneous with respect to source, length, color, stiffness or other relevant parameters. Specifically, it may be derived from different sources, where straw is a preferred material. Therefore it is possible that the filaments are used from more than one, for example 2, 3, 4 or 5 even more crop types.

Preferably, if there are filaments of more than one

origin, they will be homogeneously mixed.

The term straw is used here to indicate the plant matter that remains after the seeds are removed. More specifically, the term refers to chopped and dried grain stems such as wheat, oats, rye, rice, barley, etc. Straw can take the form of dry, hollow stems of removed seedlings, usually what remains after harvesting the plant material.

The filaments suitable for the manufacture of the Oriented Filament Frame (OSB) or Particulate Frame (PB) in the process according to the invention have a length of preferably at least 5 mm, this being the average length of the filaments when measured in a sample. about 500 grams. If the strands are at least 5 mm long, this contributes positively to the mechanical properties of the resulting panel. More preferably, the filaments have an average length of at least 10, 15, 20, 25, 30, 40 or 50 mm. The higher value of the average filament length is primarily related to origin-related restraints and practices; thus said upper value may be, for example, up to 2,000 mm or preferably up to 1,500, 1,000, 750, 500, 400, 300 or 250 mm. In a process for manufacturing MDF according to

invention, much smaller pieces of straw can be used. In fact, this type of panel can be manufactured using small particle size. One skilled in the art will be aware of the optimum straw dimensions for the specific panel provided.

The thickness of the filaments is specifically for those of non-wood agricultural origin, primarily related to the thickness of the crop itself. Sometimes it is preferred to use cut filaments such as 25 straw, the average thickness being then a significant fraction of the original thickness, for example a fifth or even a quarter, a third, or half of it or more. Other than this, it is preferred, in view of the desired properties of the end panel, that the filaments have an average thickness of at least 0.1 mm, more preferably at least 0.2, 0.3, 0.4 or even 0, 5 mm or more.

Since it is an object of the present invention to improve the use of rapidly renewing resources, the filaments in the filament blend as used in the invention would contain at least 10% by weight of non-wood agricultural filaments. Preferably, the mixture contains at least 20, 30, 40, 50, 60, 70, 80, or even 90% by weight or more of said non-wood agricultural filaments. It is even possible that essentially all the filaments in the filament mixture have a non-wood agricultural origin.

In a process according to the invention, a filament mixture may be treated with UV radiation in the presence of ozone. This treatment has been found to lead to improved panel properties such as higher strength and better internal bonding compared to ozone-treated / UV-free straw bonded together with water-based resins. The treatment is thus effective for rendering filament-like material that can be effectively bonded together using water-based resins. It has been established that said combination of UV and ozone is effective even when small dosages of both UV and ozone are applied. It has also been found that it is important to carry out UV radiation in the presence of ozone, since treatment with UV alone or ozone alone does not result in sufficiently strong panels.

In order to apply the invention in an industrial installation, the filaments may be placed on a conveyor belt such that at least 5, 10, or 30%, more preferably at least 40, 50, 60 or even at least 70 or more. 80% by weight of the filaments are at least partially exposed to UV radiation. It has been established that filament-like material need not be directly "struck" by UV radiation; It is sufficient that the filament-like material be contacted with ozone reaction products when exposed to UV irradiation.

Without wishing to be bound by any theory, it is believed that UV irradiation of ozone leads to the formation of oxyl radicals (ozonolysis). Oxyl radicals are known in the art. Contact of filament-like materials with oxyl radicals is believed to produce filament-like materials adapted to better adhesion of water-based resins. Alternative processes yielding oxyl radicals are believed to be applicable to the invention. In this case, the invention relates to a process for preparing a panel comprising similar lignocellulose-containing filament material comprising the following steps:

(a) treatment of oxyl radicals of lignocellulose-containing filament-like material;

b) mixing the resulting product with a composition

adhesive;

c) applying the resulting mixture to a lower press part; and

d) pressing and at least partially curing the composition

obtained in step c) to obtain a panel.

UV radiation is defined herein as radiation at wavelengths between 1 and 380 nm. The wavelength of UV radiation is not important; every 30 wavelength that is capable of inducing ozonolysis is believed to be useful indeed. Best results will be obtained with a UV source emitting a wavelength of less than 310 nm. In the following examples, the 254 nm wavelength was used providing very good results.

The amount of UV radiation as needed to

Obtaining the benefits according to the invention will vary depending on relevant parameters, such as the type of filament-like material. The upper and lower limits can be easily derivable by trial and error.

error using a method to determine shear strength between a pile and a reference material such as wood using a water-based resin in a bond strength test as described in example 2.

Different types of UV sources are known in the

may include conventional UV lamps or LEDs.

As indicated above, in experimental design as chosen from the examples provided herein, ozone would be present when the filaments were

exposed to UV radiation. Preferably, the concentration in or around the filaments when exposed to UV radiation is between 0.1 and 30% by volume. Alternatively, UV irradiation of ozone would take place at a different location and similar tapering material is

2 5 then contacted with treated zone reaction products

with UV. This is referred to in this document as in si tu versus ex si tu treatment.

Preferably, subsequent to UV treatment in the presence of ozone, the filaments are placed together with

30 is an adhesive composition. This can be done immediately or after some time. There were no measurable effects when the irradiated and ozone-treated failure was stored for up to several days or even weeks.

Water-based adhesive compositions as such are

known. In the invention it is preferred to use an adhesive composition comprising a resin composition, whereby said resin composition contains an aldehyde such as formaldehyde and at least one component selected from the group consisting of urea, soybean, phenol and melamine or mixtures thereof.

Alternatively, water-based resins may be used in the process according to the invention. Such resins may be selected from the group consisting of natural binders such as soybean, polyvinyl acetates and epoxy esters.

Within the context of the invention, the mention of aldehydes, urea, phenol and melamine refers to the compounds as such or in reacted form in resins or adhesive compositions. Any molar ratios as provided are for the accumulated amount, ie unreacted plus reacted compound.

Formaldehyde is preferably chosen as the aldehyde in the resin composition. The term formaldehyde

25 encompasses not only formaldehyde but also the compounds

closely related substances that may react as formaldehyde, such as paraffinic aldehyde and trioxane. Formaldehyde may be partially or totally substituted by another aldehyde, such as hemiacetal methanol methylglyoxylate

30 or other hemiacetal alkanol as listed on page 3 of WO 03/101973.

In the resin composition, the aldehyde was at least partially reacted with at least one of the group consisting of urea, an aromatic hydroxyl compound and melamine. The molar ratios between these compounds may vary within wide limits. In order to discuss these limits, it is usual for the amounts of amino compounds of urea and melamine to be recalculated in equivalents of - (NH2) 2 since this allows a calculation when the amounts of urea and melamine are combined in one number. It is preferred that the molar ratio between the aldehyde and the sum of - (NH 2) 2 and the aromatic hydroxyl compound lies between 1: 0.2 and 1: 2; more preferably, the ratio lies between 1: 0.3 and 1: 1.8, or between 1: 0.4 and 1: 1.7, or between 1: 0.5 and 1: 1.6, or even between 1: 0.6 and 1: 1.5. When looking for the ratios between urea, melamine and aromatic hydroxyl compound, it is observed that these ratios can vary in principle between all extremes resulting in a melamine-aldehyde resin (essentially zero urea aromatic hydroxyl compound), a urea resin -aldehyde (melamine and aromatic hydroxyl compound both essentially zero) and an aromatic hydroxyl-aldehyde resin (melamine and urea both essentially zero).

The effect of the combined UV / ozone treatment was measured in an experimental design. As detailed in example 1, the straw was treated with UV and ozone between 2 and 90 minutes with a varying dose of UV light and under different ozone concentrations. The intensity of UV irradiation was between 30 and 36 mW / cm2.

The straw thus treated was analyzed for its ability to yield stronger panels. Therefore, a model system was developed as detailed in Example 2. In it the shear strength is measured from a straw bonded to the wood strip using a water based resin.

The results (Table 1) show that there is a striking relationship between process ozone consumption and the shear force that a piece of straw can withstand before resin bonding breaks.

As shown in figure 1, the resistance to

The shear obtained from the untreated straw was of the order of N. Straws that were treated in a manner that resulted in a moderate ozone consumption of about 2 g / m3 already showed a maximum load of 30 N.

this way since it would withstand forces of up to 80 N. Also, the average load increased with ozone consumption in the experimental design (figure 1).

It should be mentioned in this document that not all data points in figure 1 represent the actual resistance.

20 of resin bonding. Some straws break even before the bonded bond breaks. These measurements were interpreted as representing the minimum bond strength. When the bond broke, it was interpreted as its maximum resistance. Notably, in 11 out of 12 (92%)

2 out of the control experiments listed in table 1, the

The resin binding broke before the straw, indicating that the resin binding was much weaker than the straw itself. In contrast, of the 112 straws listed in table 1 that were treated with UV and ozone,

30 only 13 (12%) showed a break in resin bonding, whereas in all other cases the straw broke before the resin bond broke. This means that the bond strength of the resin in this case exceeds the strength of the straw, and thus rendered the straw suitable for use on a panel board. The strength of such an improved panel would then only be determined by the strength of the specific type of straw used for its production and not by the resin used.

It is also evident from the results shown in table 1 that the effect is almost instantaneous. Figure 2 shows the effects obtained in relation to the time of treatment. The maximum effect of 80 N was achieved after 15 minutes of treatment, considering that good results of more than 40 N would be obtained after 2 minutes of treatment only.

Temperatures in these experiments ranged from 200 ° C to 80 ° C with some exceptional maximums above these. No temperature effect of any statistical significance would be established, however, some 20 experiments showed that a more effective treatment was obtained at elevated temperatures, such as, for example, above 40, 60 or even above 80 ° C.

Notably, it was found that the required straw would not be directly irradiated by the UV source; Even when the straw layer in the experimental design was 6-7 cm thick, the straws at the bottom of the pile were as good as the straws at the top, directly irradiated by the UV source. Therefore, it is postulated that the effect is caused by very reactive oxy radicals produced by UV ozone irradiation, in relation to a right effect of straw UV irradiation. This would also explain why the effect is not observed on untreated straw that was in the field under weather conditions with somewhat high ozone concentrations, as sometimes found after storms, UV irradiated from natural sunlight.

When straw treated with any of the experimentally applied conditions was used for the manufacture of panel boards, it was observed that any of the experimentally applied conditions would be sufficient for

render better quality panel planks. This allows the validation of the experiment model as well as the industrial applicability of the present invention. It will be appreciated that the conditions for applying the method according to the invention may vary in different ranges.

It is now within the skill of the art to determine the exact parameters by which improved straw panels can be manufactured. It is anticipated that a suitable process for producing UV / ozone treated straw will use a conveyor belt that

20 operates through an ozone-containing chamber where it is

UV irradiated. Alternatively, ozone irradiation with UV can be performed in a separate compartment and ozone reaction products can be fed into a chamber where the straw passes a

appropriate speed. Equipment as described in example 2 may provide a useful tool for quickly determining whether a specific combination of aspects is effective in achieving the expected result.

It will be understood that the process according to the invention

30 may be useful for the production of all types of panels which require superior mechanical strength. Such panels may include Oriented Filament Board, Medium Density Fiber Board, High Density Fiber Board, Insulation Board or Particular Board. The skilled person is aware of the joints and connections of these types of panels.

In the manner as described above, a straw would be obtained that would result in panel boards having mechanical properties according to Canadian Standard CSA 0437.0-93 Group I (FM).

Figure 1: Relationship between ozone consumption and shear strength, indicated as Load, in Newton.

Figure 2: Relationship between treatment time and shear strength, indicated as Load, in Newton.

Figure 3: Schematic representation of an experimental design used for combined UV / ozone treatment. Reference signs indicate: 2 01: ozone generator, 202: grid, 203: UV lamps, 204: reflectors, 205: sample pump, 206: ozone meter.

Figure 4: Schematic representation of an experimental design for determining the shear strength of a resin bond. Fig. 4a is a longitudinal view; Fig. 4b is a cross-sectional view showing: 101: wood strip, 102: straw, 103: resin bonding. The character F indicates the force in the direction of the direction.

Example 1: Experimental UV / Ozone Treatment

30

A grid was placed in a closed box approximately 5 cm above the bottom of the box (Figure 3). The experiments were performed in two boxes of different sizes, one having approximate dimensions of 50 χ 30 χ 40 cm (base χ height χ width), the other presenting 100 χ 30 χ 25 cm (base χ height χ width). Pieces of straw cut in the longitudinal direction essentially as described in European Patent EP 0998379B1 to Alberta Research Council, individual straws having approximate dimensions of 0.5-25 cm in length and a thickness determined by the natural source were positioned at the top of the grid. A UV source was movably positioned above the grid so that it could be used at varying distances above the grid. An ozone inlet was positioned below the grid in such a way that the ozone would flow freely and eventually be distributed through the grid along the straw toward the ozone outlet at the top of the box. Ozone was generated using a commercially available ozone generator. Ozone flow was measured at the inlet and outlet to determine the level of ozone consumption by the process. Ozone flow was adjusted at the inlet to a predetermined level (Table 1) and the flow was measured at the inlet. When inlet ozone flow reached a constant level, the UV lights were turned on and ozone consumption was measured by determining the difference between inlet and outlet ozone concentration. Special care was taken to ensure that sufficient ozone was available for reaction. In practice, this was done by ensuring that there was no ozone leaving the inlet. Different types of UV lamps were used; low and medium pressure lamps shown in Table 1 as LP and MP.

Example 2: Shear Strength Measurement Straw treated in the manner described in example 1 was recovered from the grid and glued to a strip of wood. Special care has been taken to glue only the outside of the straw to the wood strip, as the inside is known to provide a better bond with the water-based resin than the outside (figure 4). This effect is sometimes explained by the fact that the outer side of the straw contains a waxy or lipid layer when the inner side is considered not to contain the same. The water-based resin used to stick the straw to the wood strip consisted of a commercially available Urea Melamine Formaldehyde (Resin MUF Hexion BR62WT)). The glue was cured for about 1 minute at 140 ° C and the wood strip with the straw attached (construction) was then applied to an apparatus that measured the shear strength of the construction. The maximum load was determined, whereby an increasing force was applied in the longitudinal direction of the construction. It was observed whether the straw broke or if the binding failed (Table 1).

Example 3: Construction of Panel Planks

One to 14 cm pieces of cereal straw

25 cut were treated for 30 minutes with UV and ozone,

essentially as described in Example 1. Four low pressure UV lamps were used with a wavelength of 254 nm and a combined energy of 4,000 Watt. This resulted in a dose of approximately 7

30 mW / cm 2. The average distance from the UV source to the straw was approximately 25 cm with a range of 5-45 cm. Ozone consumption was approximately 20 g / m3. A commercially available MUF resin (Hexion BR62WT) containing ammonium sulfate as a catalyst was sprayed onto the straw using an atomizer in an amount of 8-10% dry weight. An 865 χ 865 mm track was manually constructed and pressed at 190 ° C at a controlled pressure of 1,700 kPa for 160-200 seconds. The panels were pressed to the target thickness of 11.1 mm.

After pressure, the panels were trimmed to the dimensions of 711 χ 711 χ 11.1 mm. Target density was 640 kg / m3; The various plates obtained according to the above procedure showed densities ranging from 628 to 678 g / m3.

Example 4: OSB Performance Made of UV / Ozone Treated Straw

Two separate panels produced according to Example 3 were tested for strength in accordance with Canadian Standard CSA 0437 / Group 1 (R-I). A prior art panel was constructed in exactly the same manner as described in Example 3 without UV / Ozone treatment and is shown for comparative purposes. The modulus of elasticity (MOE) and the modulus of rupture (MOR) of the panels according to the invention were measured in this experiment, as well as the internal bond strength of the panels. Results are shown in Table 2. α)

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Claims (22)

Process for preparing a panel characterized in that it comprises a lignocellulose-containing filament-like material comprising the following steps: a) treating the lignocellulose-containing filament-like material with a combination of UV and ozone radiation, both in situ as ex situ; b) mixing the resulting product with an adhesive composition; c) applying the resulting mixture to a lower press part; and d) pressing and at least partially curing the composition obtained in step c) to obtain a panel. Process according to Claim 1, characterized in that the adhesive composition is a water-based resin. Process according to Claim 2, characterized in that the water-based resin is selected from the group consisting of soybean, an aldehyde, and at least one component selected from the group consisting of urea, phenol and melamine, or mixtures thereof. Process according to Claim 3, characterized in that the aldehyde is formaldehyde. Process according to Claim 1, characterized in that the adhesive composition is a non-water based resin. Process according to Claim 5, characterized in that the non-water based resin is selected from the group consisting of soy, polyvinyl acetates, epoxy polyester and acrylics. Process according to any one of claims 1, 2, 3, 4, 5 or 6, characterized in that the curing temperature is between 1.85 and 251.85 ° C. Process according to any one of claims 1, 2, 3, 4, 5, 6 or 7, characterized in that the UV radiation has a wavelength between 1 and 385 nm, preferably below 310 nm. , more preferably 254 nm. Process according to any one of claims 1, 2, 3, 4, 5, 6, 7 or 8, characterized in that the UV radiation has an intensity between 0.1 and 725 mW / cm2 preferably between 1 and 60 mW / cm2 even more preferably between 10 and 50 mW / cm2. Process according to any one of claims 1, 2, 3, 4, 5, 6, 7, 8 or 9, characterized in that the lignocellulose-containing material is a non-wood agricultural material. Process according to any one of claims 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10, characterized in that the lignocellulose-containing material has a water content until complete saturation. Process according to any one of claims 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or 11, characterized in that the lignocellulose-containing material is natural straw. Process according to Claims 1, 2, 3,4, 5, 6, 7, 8, 9, 10, 11 or 12, characterized in that the adhesive composition is employed in an amount of 1 to 30 % by weight. Process according to any one of claims 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 or 13, characterized in that the adhesive composition is cured in at least 75%. Process according to any one of claims 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 or 14, characterized in that the lignocellulose-containing material is in the filaments, which were oriented before step d). Process according to any one of Claims 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 or 15, characterized in that the curing of the composition is carried out at a temperature between 76.85 to 176.85 ° C. Process according to any one of claims 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 or 16, characterized in that the adhesive composition comprises an aldehyde and melamine. Process according to Claim 17, characterized in that the aldehyde is formaldehyde. A panel characterized in that it can be obtained by a process of any one of claims 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17 or 18. Panel according to Claim 19, characterized in that it has the mechanical properties according to Canadian Standard CSA 0437.0-93 Group 1 (R-I). Oriented Filament Board, Medium Density Fiber Board, High Density Fiber Board, Insulation Board or Particular Board characterized in that they are obtained by a process of any of claims 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 or 13. Apparatus characterized in that it is suitable for carrying out a process of any one of claims 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 or 13.