RU2530162C1 - Installation for thermal treatment of frozen dough pieces - Google Patents

Abstract

FIELD: food industry.

SUBSTANCE: installation for thermal treatment of frozen dough pieces contains a horizontally positioned cylindrical screen body where a cylindrical resonator chamber is coaxially positioned so that their generatrices interface in one line wherein a milling mechanism is embedded. There are gaps, sized less than a quarter wave length, along the side surfaces of the resonator chamber and the screen body; the gaps are positioned in a single vertical plane. The UHF generator unit is installed on the base of the screen body so that the radiator is located inside the resonator chamber where dielectric rolls rotating by means of the motor reducer are positioned along the gap 12. There are screen overlaps for power flow radiation restriction between the gaps.

EFFECT: invention allows to intensify the dough pieces defrosting process.

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Description

The present invention relates to the field of electrical engineering, in particular to microwave heating devices with an energy supply, and can be used in the food industry to defrost dough pieces in the production of bakery products.

There are four main ways to freeze dough pieces and bakery products:

1. freezing the dough after kneading in pieces and blocks;

2. freezing dough pieces immediately after molding;

3. freezing dough pieces after proofing;

4. freezing of products after partial or full baking.

Consider freezing dough after kneading in pieces and blocks. After kneading, the dough is divided into billets weighing from 100 g to 3 kg or more, previously making them as flat as possible for better freezing. Next, the workpiece is subjected to shock freezing and storage at a temperature of -18 ° C. After storage (before use), the dough pieces are defrosted for 30 minutes, proofed for 2 ... 4 hours at + 20 ... + 25 ° C and humidity 70 ... 75%, baked for 10 ... 25 minutes.

The limiting factor in using this technology is to reduce the moisture content of the dough to obtain a more elastic consistency, which leads to a decrease in the dough yield, as well as the need to use gluten.

Defrosting (defrosting) must be “delicate”, as the phenomenon of “growth” of crystals can occur, which cause damage to the membranes of yeast cells. After defrosting, there will be no loss of liquid, the consistency and taste of the product will not change.

Currently, different methods of defrosting are used.

1. The most common way is to defrost in a proofer. In terms of the quality of finished products, it is considered the worst even at a relatively low temperature in the cabinet (up to 30 ° C). The surface layer of the dough piece is “overgrown”, which negatively affects the quality of the finished product. This especially affects workpieces weighing more than 200 g.

2. Defrosting at room temperature, followed by fermentation in a final proofing cabinet. This method is close to the first and has an additional drawback - the likelihood of airing the dough pieces.

3. The most modern and optimal way to defrost frozen dough semi-finished products using programmable final proofing cabinets is programmed defrosting. The first phase of thawing is carried out at a temperature of 0 ° C. In this case, the water gradually passes from a solid to a liquid state, moreover, until the moment of activation of yeast (uniform proofing over the entire volume of the product), which reduces the effect of condensation. During the second phase of thawing, the temperature slowly rises from 0 to 20 ° C and above. With this method, it is important to ensure optimum humidity in the final proofing cabinet.

There are quick-frozen yeast dough and frozen after partial proofing. From these technological subtleties depends on how you need to defrost the dough. The product of instant freezing should be thawed gradually - first in the refrigerator, then at room temperature. When defrosting at too high a temperature, the dough becomes very soft and sticky.

An object of the invention is to develop an installation using microwave energy, which provides the intensification of the process of defrosting dough pieces for the production of bakery products.

The specified technical result is achieved as follows. Installation for heat treatment of frozen dough pieces, characterized in that it contains a horizontally arranged cylindrical screen housing, inside which a cylindrical resonator chamber is coaxially located so that their generators are joined in a line where the grinding mechanism is mounted, and along the side surfaces of the resonator chamber and the screen case there are gaps of less than a quarter of the wavelength, and they are located on the same vertical plane, while the microwave generator unit is installed flax on the basis of the screen housing so that the emitter is located inside the resonator chamber, where along the gap there are rollers rotating from the gear motor.

Figure 1 shows the installation diagram for heat treatment of dough pieces:

1 - screen housing, 2 - cylindrical resonator chamber, 3 - grinding mechanism (top crusher), 4 - test blanks, 5 - microwave generator block, 6 - emitter, 7 - crushed test blanks, 8, 9 - dielectric rolls (8 - motionless, 9 - movable), 10 - dielectric guides, 11 - spring, 12 - gap on the generatrix of the resonator chamber, 13 - screen partitions, 14 - rolled dough, 15 - discharge conveyor.

The installation for heat treatment of frozen dough pieces (Fig. 1) contains a cylindrical screen housing 1, inside which a cylindrical resonator chamber 2 is coaxially located. Their generators are docked, and a “Grinder-grinder” 3 is installed in this place, which allows transporting and grinding test pieces and blocks 4. A microwave generator unit 5 is installed from the end to the screen housing so that the emitter 6 is located in the resonator chamber 2. Inside the resonator chamber 2 there are crushed dough 7 and dielectric rolls 8, 9 complete with dielectric guides 10 and a spring 11, which allows you to adjust the width of the gap between the rollers 8, 9. The bearings of the roller 8 are stationary, and the roller 9 are movable and held by a spring 11. Moreover, under this gap, the cylindrical resonator chamber along the generatrix has a gap 12, less than a quarter wavelength of electromagnetic radiation. The same gap exists along the generatrix of the screen housing 1. The gaps form a channel, since there are screen partitions 13. A rolled dough 14 passes through this channel and enters the discharge conveyor 15.

Installation for heat treatment of frozen dough pieces works as follows. Turn on the “Top-crusher” 3, load the test pieces 4 into its inlet pipe. At the same time, the microwave generator 5 is turned on, after which an electromagnetic field of the microwave range is formed in the resonator chamber 2, since the emitter 6 is directed inside the resonator chamber 2 through the end of the screen housing 1. The crushed dough 7 enters the resonator chamber 2, is heated endogenously, uniformly thawed, and dielectric guides 10 hits the rolls 8, 9. In this case, the roll 9 rotating from the gear motor pulls the thawed dough particles 7 into the slot, the width of which is regulated by the spring 11. The dough rolls out to the rollers 8, 9 and falls on the discharge conveyor 15. The thickness of the rolled dough is determined by the width of the gap between the rollers 8, 9. In this case, the gap and gaps 12 on the generators of the resonator chamber and the screen housing should not exceed a quarter of the wavelength, in order to comply with the sanitary power flow rate microwave electromagnetic radiation. Screen partitions 13 also contribute to this. For a piece of dough to be caught by rolls and rolled out, it is necessary that the angle of capture is less than the angle of friction of the dough. The limiting frequency of rotation of the rolls is found on the basis of the condition for the exclusion of slipping pieces of dough on the surface of the rolls.

Claims (1)

Installation for heat treatment of frozen dough pieces, characterized in that it contains a horizontally arranged cylindrical screen housing, inside which a cylindrical resonator chamber is coaxially located so that their generators are joined in a line where the grinding mechanism is mounted, and along the side surfaces of the resonator chamber and the screen case there are gaps of less than a quarter of the wavelength, and they are located on the same vertical plane and are interconnected by a screen junction ytiem, wherein the microwave generator unit mounted on the base screen housing so that the emitter chamber is inside the resonator, wherein the dielectric disposed along the gap rollers, rotating on gear motor.

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