JPS59154975A - Drying of tobacco leaves in bulk dryer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for drying leaf tobacco in a bulk dryer.

The bulk dryer is characterized in that it circulates and blows heated air, and the earlier dryer C is referred to as the "conventional dryer".

), it has advantages such as higher hanging density and more accurate control of temperature and humidity, and is currently widely used.

However, dry leaves dried by bulk dryers are
Compared to dry leaves dried using a conventional dryer, there was a drawback that the flavor was inferior.

An object of the present invention is to provide a drying method in a bulk dryer that eliminates such drawbacks.

In the process of investigating the cause of the decline in the aroma and taste of dried leaves during bulk drying, the inventors discovered that the indoor ethylene gas concentration in conventional dryers was higher than that in bulk dryers. The indoor ethylene gas concentration of bulk dryers is 5 to 35 ppb, with an average of about 20 ppb.
In contrast, conventional dryers produce 20 to 100 pp.
b, with an average of about 50 pPb. The reason why the ethylene gas concentration is low in bulk drying is thought to be because the generation of ethylene is suppressed due to the different drying environmental conditions such as gas environment.

Based on this knowledge, we have conducted repeated tests and found that when drying leaves using a bulk dryer, we injected a small amount of ethylene gas and maintained the indoor ethylene gas concentration within the range of 40 to 600 ppb. The results showed that deterioration in aroma and taste could be prevented.

In the present invention, after suspending yellow variety, barley variety, or native variety tobacco leaves into a circulating bulk dryer, ethylene gas is injected and a normal drying operation is performed. The ethylene gas concentration was increased to 4 from the start of drying until the end of yellowing or the end of bone drying.
Drying is carried out while maintaining the concentration within the range of 0 to 500 ppb.

The ethylene concentration in the present invention is 40 to 50 p.
The effect is recognized from about 100 ppb, but the effect becomes noticeable from about 100 ppb, and it is desirable to use 200 to 400 ppb.
PB is good. Injection of ethylene gas may be continuous or intermittent.

According to the above-described present invention, the yellowing of the tobacco leaves progresses easily, so that there is no blue residue on the appearance, especially the blue of the metastases, and the result is good quality drying with good color, rich flavor, and less curl. This method has the advantage that leaf tobacco can be obtained and at the same time the drying time can be shortened.

A known document on a method for drying leaf tobacco using ethylene gas is Japanese Patent Publication No. 47-8997. This involves hanging leaf tobacco after harvest in a room with an ethylene gas concentration of 5 to 1,009 rooms, a temperature of 25 to 40 degrees Celsius, and a humidity of 80% or more.
After leaving it for 100 hours, it is dried using wind power to accelerate yellowing and shorten the drying time.

In this case, the ethylene gas treatment is left undisturbed in a room with no ventilation for 30 to 100 hours, so approximately 1.5 to 4
For several days, it will become dry, meaning that dehydration will not progress. From the viewpoint of leaf tobacco quality, there is knowledge that it is not desirable to suppress dehydration and measure only changes in leaf color and content components. Traps that measure dehydration require ventilation. However, if ventilation is performed in this case, a large amount of indoor air with an ethylene gas concentration of 5 to 100 ppm will be exhausted. Ethylene itself is not directly harmful to the human body, but ethylene is a plant hormone, and plants regulate their germination, growth, flowering, maturation, etc. by the very small amount of ethylene they produce. Therefore, the concentration of ethylene in the atmosphere is 0.001-1O
When contaminated to a pP level, plants lose their self-regulatory function,
cause various disorders.

The main sources of ethylene are natural gas, petroleum 1 coal combustion, automobile exhaust gas, and gas leaks from ethylene production plants, so ethylene concentrations are low near oil complexes in zone 2, which have heavy traffic in large cities. tends to increase. The normal atmospheric ethylene concentration is 3-5 pI)b.

In Japan, environmental standards for ethylene have not yet been determined, and it is measured as being included in all hydrocarbons. However, in the case of the state of California in the United States, the environmental standard for the concentration of ethylene in the atmosphere is 5001) pb as a 1-hour value and 1 o o I)p as an 8-hour value.
b, and agricultural areas are regulated to 1/2 of this regulation.

Considering the above, it seems that the addition of ethylene on the order of ppm as a drying technology to spread in leaf tobacco production areas, which are purely agricultural areas, is a problem in practical application due to air pollution.

The ethylene gas concentration in the present invention is 40% as described above.
~500 ppb, which is the range of
1 of the concentration used in the invention described in Publication No.-8997
/lO or less, there are far fewer practical problems.

Next, to explain an experimental example of the method of the present invention, using harvested leaves of yellow tobacco "MC", 17.5 kg of tobacco leaves were placed in a blow-up type circulation bulk dryer (hanging field area o, asm'). is suspended, the hanging field wind speed is 0.17m/sec,
It was carried out using one film amount. Temperature and humidity are in the yellowing period (dry bulb 38-43
℃, wet bulb 35℃) 9 Color gloss fixed period (dry bulb 45-50℃, wet bulb 36-38℃), bone dry period (rolling bulb 55-70℃, wet bulb 39-40℃). While tracking the temperature and humidity,
In Ward 1, the indoor ethylene concentration is calculated from the amount of ventilation and is 200~
Ethylene gas was injected from a cylinder so that the amount was so ppb. The injection treatment continued until the end of the mesophyll drying period. 2
Ward carried out similar drying without injecting ethylene.

The actual ethylene gas concentration during drying was determined by collecting indoor air in a mercury perchlorate solution, concentrating it, and quantifying it by gas chromatography. As a result, the average concentration is 3921 for the middle lobe.
) I) t) s In the case of true leaves, it was 408 ppb.

Experiments were conducted once for each middle leaf and one leaf for each leaf set position of harvested tobacco leaves. The drying time is 12 minutes for the middle leaves with ethylene added in section 1.
0 hr, and Konoha's time is 107 hr, which is about 14 hr shorter than the 2nd district practice. The amount of ethylene added in Section 1 was 493 ml for Nakaha and 429 mt for Konoha. Approximately 2.7 Kg of dry leaves were obtained in each of the two trials (see Table 1).

(Hereinafter referred to as Keihaku) Compared to the tobacco produced using the conventional method in the 2' district, the leaf color is slightly more orange (usually lemon-colored) with no blue residue, and the leaf has a good color tone with good lining and is dense. The leaf quality was improved, and the quality of the appearance was improved.It was observed that the smoking taste was very good, with less caterpillar and astringency, sweetness and brightness, and increased smoke volume. (
(See Tables 2 and 3).

(Upper level 5 lower level It's low level + 1 level 4 σ ■ Holding button The above experimental example was about drying yellow seeds in a bulk dryer, but in the same way, a native type of Burle type was dried in a bulk dryer. A similar effect was observed in this case.

As described above, the present invention is effective in improving the quality of leaf tobacco in bulk dryers and economically, and is also desirable in terms of regulating the concentration of ethylene gas in the atmosphere.

Sender: Japan Monopoly Corporation

Claims (1)

[Claims] The leaf tobacco is dried while adding ethylene gas and adjusting the temperature and humidity appropriately so that the ethylene gas concentration in the leaf tobacco hanging room is maintained in the range of 40 to 500 ppb at least until the end of yellowing. Method of drying leaf tobacco in a bulk dryer.