DE1653291C - Process for the processing of bagases for the production of moldings - Google Patents

Description

I 653 291

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The invention relates to a method for Hch, because the entire painterial amount for hamlet preparation Bagasse in lamellar and plate processing can be completely dried down again Chenform that must be glued and pressed to form molded bodies. There is also the uetalir, dall at will. somewhat irregular water distribution.

If one considers an enlarged cross-section of 5 correct zones of the stored material in optimal

Sugar cane (see Fig. 1), then you can see that the condition for the development of hgnocelluose consumption

this come from fiber bundles 2 with easily changeable generating organisms that quickly and deeply

There are dimensions, enclosed in a parent-grabbing break down all of the material. This bio-

chyme structure 1 and 3, which is at the heart of the tube logical process of fermentation is the cost

is very loose and is considerably analogous to the outside, and it has been found that it does the

condensed. The density of the parenchymal tissue is the strength of the particles used to produce the horin-

dorl practically the same as that of the fiber bundle. In the body it is very disadvantageous.

In the same way, the mechanical strength of the bagasse, which is subject to the action of the biodu-

Parenchyma structure from the inside out. mix fermentation and roasting underworkn

The bagasse, when it was from the sugar mills i ₅ , z. B. in beater mill! crushed. -, »

or supplied by further diffusion devices, a fibrous mass is obtained because of the process

is, in the known methods of the above-mentioned comminution, selectively to the weakest

called kind initially stored and only later transfers to parenchymal tissue and turns it into dust

Shaped bodies processed. converts (see. Fig. 3).

This bagasse contains some percent sugar, FER *> Will veipreßt bodies such fasengen Hinzelteilchcn / u Formner nitrogenous substances and about 50 "/ u water. is to achieve sufficient ser. It thus forms a very active microbiological strength property, a relatively high level of environmental requirements, the activity or effectiveness of which can be determined, since the surface of the particles is still large in relation to their weight due to the generally increased ambient temperature. At the same time isi rature is strengthened. When storing Bagasse as a higher compression is necessary so that the M ;. starts a fermentation similar to roasting. As a result of the largely /> one which splits the fibers 2 from the parenchymal-cylindrical shape, the sliding of the fibers unic; -weave 1 and 3 is split off. 'favors each other, which is detrimental to the

The fermentation of the bagasse is usually affected by the elastic modulus of the molded body.

difficult to control and leads to very under- 30 The object on which the invention is based

Different material properties, which result, can therefore be seen in a process

that the parenchymal tissue is broken down and that the type mentioned develop in the

the bagasse 111 single fibers disintegrates. a weakening of the natural structure of the

Another stage of fermentation has a lane through fermentation and roasting and the

progressive breakdown of the macrofibers of the bagasse 35 due to the fibrous structure of the outlet

and thus a deterioration in the mechanical material position for the molded body is avoided

Properties result. One such material is to be.

for the plate production no longer at all. The invention solves the problem in that the

suitable. Bagasse after leaving a sugar mill or

The progress of the fermentation is through a ₄ o factory if necessary after a deposition of

Number of unpredictable factors, such as E.g. disturbed or crushed cells and separated

Change in ambient temperature, changed fibers immediately to a moisture content

tion of the relative moisture content in the area of a maximum of 20 "/» is artificially dried,

gebungsatniosph'ärc, seasons with more or This drying can be effective and economical

less rain, different ventilation, due to the fact that the flue gases from the steam boilers

by wind direction and wind strength etc. It follows that supply the sugar factories with steam,

there is a great unevenness of the bagasse Oh these steam boilers consume fuel oil or bagasse-

bci of processing into moldings, since in chcn. is only of minor importance; but in

In the second case, a dust collector must be provided for larger quantities of bagasse stored for certain parts

are still in good shape while others are turning 50. Where the steam boilers are already

are so badly attacked that the material is no longer brazen, the drying chamber can

can be further processed. Sorting can be heated directly. The deposition of the

for practical reasons not made / rush and the fibers and fibrils that are separated

will. have already partially dissolved in the sugar mills,

There are known methods in which the 55 relieves the drying chamber and has the other

The advantage of keeping the fermentation process under control is that an unusable part of the.Bagasse

tries to avoid, for example, an untimely temperature, directly to the sugar factory for its calorie

to prevent temperature increase. One used to this can be supplied as needed

z. B. Boric acid to slow down this process, A drying of the bagasse on a moist

or you renew and periodically increase the moisture content below 15 ⁰ O is, after another

salary. In the presence of boric acid feature of the invention, not necessary; they affect

However, the hydrolytic degradation of the bagasse, but in no way affects the process according to the

which was invented by the natural acids of the plant.

begins, greatly accelerated. As with fermentation. The advantages that can be achieved with the invention are first broken down, so that the parenchymal tissue is found in the natural association of the bagasse only the elementary fibers remain. by switching off fermentation and roasting Ifine increase in moisture content is largely retained for. This creates at the production of moldings is very uneconomical - the subsequent crushing of the bagasse is none

ttightly frayed particles according to Fig. 3, but particles, have the lamellar and platelet shape (see. Fig. 2). The moldings produced from these particles are characterized by better strength properties with reduced strength in relation to their bulk density Glue consumption. It is also possible to produce insulating moldings from this starting material low density with increased mechanical strength.

To prove that with the erfmdungsgemä-Ceti Drying of the bagasse moldings with improved strength can be produced, one has iwei series of molded bodies »produced under the conditions described below: Directly after In the sugar mill, the moist bagasse is subjected to normal fermentation according to the alien process been. Then, after about six months of ball storage, the bagasse became a hammer mill fed.

The large particles after this treatment Still remaining in the material and not suitable for the production of the moldings, they became pneumatic separated and finely ground in a cross beater mill. The dust was passed through a sieve of 0.5 mm mesh size eliminated. The material obtained in this way is fine enough for the production of the moldings; it presents itself essentially in the form of coarse fibers which have practically no parenchymal tissue contain more.

In the second series of moldings, the bagasse of the same origin was used according to the invention Process not subject to fermentation process: It was artificially dried immediately after leaving the sugar mill, up to a moisture content of about 20 "ό. Then ivurd ** them fed to a hammer mill. The coarse Particles which were suitable for the production of the molded bodies in a sealed manner were separated out pneumatically and fed to a cross beater mill. The dust was sieved through a 0.5 mm sieve (Minting.

The material obtained in this way was sufficiently fine for the production of the moldings. It contained at least 50% particles having a surface area of 10 to 20 x 2 to 4 mm.

The bagasse prepared in this way was glued with a 0% urea-formaldehyde resin solution containing hardeners and water repellants customary in plate production, so that the material contained ¹ % solid resin, based on dry bagasse. After the glue had been applied, the moisture content of the mixture was adjusted to about 14 ", and then a 1.22 * 1.22 m plate was formed and pressed at 140 ° C. for ¹ A minutes.

After complete cooling, the moldings were sanded on the two surfaces and subjected to conditioning in an atmosphere of () 5 " Moisture and 20 C, the moldings were made according to DIN standards for determining the flexural strength and the modulus of elasticity are checked.

The following results were achieved:

Density of the molding in kg / m ^{: 1}

Thickness in mm

Flexural strength in
kg / cm ²

Young's modulus in
kg / cm x ¹

Fermented bagasse

M 8 630

2C 12

120 140 9700 I 12 400

Bagasse niirhi fermentier!

520 (VIO

20 I. '

170 260

14 500 20 5 (10

It is thus a significant improvement in K tensile strength and elastic modulus to deliver.

In addition to improving the mechanical properties, there is also a very considerable improvement in the surface quality and the edges of the Moldings made from unfermented bagasse particles can be detected.

Claims (2)

Patent claims: 1. A method for processing bagasse for the production of moldings, thereby characterized that the bagasse after leaving a sugar mill or factory possibly after a separation of destroyed or crushed cells and separated ones Fibrils immediately to a moisture content of a maximum of 20%> is artificially dried. 2. The method according to claim 1, characterized in that the bagasse to a moisture content not less than 15 per cent. is dried. 1 sheet of drawings