JP2000093081A - Yogurt-manufacturing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a yogurt-manufacturing device capable of manufacturing yogurt by simply and safely fermenting raw mil in ordinary homes. SOLUTION: This yogurt-manufacturing device is a tubular device having a planar exothermic element having a positive temperature coefficient characteristics installed in the inside face. The planer exothermic element comprises an exothermic resistance sheet formed by kneading a thermoplastic resin and electro-conductive particles and a pair of electrode wires installed at the both ends.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a yogurt maker. More specifically, the present invention relates to a yogurt maker that can easily and safely ferment raw milk to produce yogurt in ordinary households.

[0002]

2. Description of the Related Art Inhabitants of the southwestern coast of the Black Sea, such as Turkey and Bulgaria, have been coagulated by adding lactic acid bacteria to milk for a long time.
It was served as yogurt for drinking. Metnikov noted the fact that Bulgaria has a very long lifespan, advocating that it is to use yogurt regularly, and by drinking yogurt, lactic acid bacteria suppress harmful bacteria that produce toxins in the intestine, This was to suppress the generation and absorption of putrefactive components, so the drinking wind spread worldwide, and even in Japan, a large amount of yogurt was produced,
Became consumed. Yogurt is usually made by adding lactic acid bacteria to milk as a starter, keeping it at a certain temperature,
It is produced by fermentation. The lactic acid bacteria used as starters include the Bulgarian bacteria Lactobacili
lulus bulgaricus, Thermophilus S
treptococcus thermophilu
s, lactis Streptococcus lact
is, Cremoris Streptococcus cr
emoris, Lactobacillus acidophilus
lucacidophilus, and these are used in an appropriate combination of two or three kinds, and are devised so as to give a unique flavor to the obtained yogurt. As an example, Bulgarian bacteria having a strong lactic acid productivity and lactis bacteria having a strong effect of improving flavor are mixed and used at a weight ratio of 1: 4. The flavor can also be changed by the amount of milk solids, sugar, flavor, lactic acid and the like of yogurt. With the spread of yogurt drinking and the spread of genuine and handmade orientations, there has been a desire in ordinary households to make homemade yogurt by themselves using a combination of raw milk and lactic acid bacteria that suits their tastes. . However, the production of yogurt requires fermentation while keeping the raw milk at 30 to 40 ° C. for about 10 hours, so a thermostat is required, but it is expensive to purchase at home. For this reason, there has been a demand for a yogurt manufacturing device that can be used easily and safely at home.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a yogurt producing apparatus which can easily and safely ferment raw milk to produce yogurt in ordinary households.

[0004]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, a cylindrical member having a sheet-like heating element having a positive temperature coefficient characteristic on the inner surface has been produced. By applying electricity to the container containing milk, a stable
It has been found that yogurt can be easily and safely handmade by heating to ４０40 ° C., and the present invention has been completed based on this finding. That is, the present invention
(1) A yogurt manufacturing apparatus characterized by comprising a tubular heating element having an inner surface having a positive temperature coefficient characteristic and having a positive temperature coefficient characteristic, and (2) a sheet heating element having a conductive property to a thermoplastic resin. A heating resistor sheet formed by mixing particles and a pair of electrode wires provided on both sides of the sheet (1).
Item 3. The yogurt production device according to item 3, wherein the weight ratio of the thermoplastic resin to the conductive particles is from 10:90 to 80:20.
(2) The yogurt manufacturing apparatus according to the above (4), wherein the sheet heating element is
Item (1) or (2), wherein the yogurt manufacturing device is provided with an exterior sheet, and (5) the cylindrical material has a foamed plastic layer outside the sheet heating element. (1) A yogurt production device according to the item (1). Further, as a preferred embodiment of the present invention, (6) the ratio of the maximum electric resistance value of the sheet heating element to the electric resistance value at room temperature is 1.0.
The yogurt production device according to the above (1) or (2), wherein the temperature is 40 or more and the temperature at which the electric resistance value is 10 times the electric resistance value at room temperature is 40 to 80 ° C.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION A yogurt manufacturing apparatus according to the present invention is a cylindrical article having a sheet heating element having a positive temperature coefficient characteristic on an inner surface. There is no particular limitation on the raw milk to which the production device of the present invention is applied, and for example, yogurt can be produced using cow's milk, goat's milk, buffalo's milk, or the like as the raw milk. FIG. 1A is a developed view of one embodiment of the yogurt manufacturing apparatus of the present invention, and FIG. 1B is a cross-sectional view taken along line AA. The yogurt manufacturing apparatus of this embodiment is a tubular article having a square cross section and a lid, and has four rectangular side surfaces 1 and one square lid surface 2 when developed. A planar heating element 3 having a positive temperature coefficient is provided on the inner surface of the side surface. The sheet heating element is provided with a pair of electrode wires 5 on both edges of the heating resistance sheet 4, and the electrode wires are fixed at one end by an insulating sealing material 6 and connected to a power cord 7.
At the end of the power cord, a plug 8 for connecting to an external power supply is provided. The sheet heating element is covered on both sides with an exterior sheet 9. FIG. 2 is a diagram illustrating the use of the yogurt manufacturing apparatus of the present invention. As shown in FIG. 2 (a), raw milk is prepared in a raw milk container 10 and lactic acid bacteria are added thereto.
Place on top of 1. The saucer can also be provided with a planar heating element. There is no particular limitation on the raw material milk used, for example, commercially available milk can be used as raw material milk as it is, or skim milk powder is added to commercially available milk and dissolved to increase milk solids, or according to taste. You can also add sugar or flavor, or add a little agar to harden the tissue. There is no particular limitation on the lactic acid bacteria added to the raw milk, for example,
Bulgarian bacteria, thermophilus bacteria, lactis bacteria, cremoris bacteria, acidophilus bacteria, and the like can be used in appropriate combinations according to tastes, or commercially available yogurt can be used as it is as a source of lactic acid bacteria.
By selecting a yogurt that suits your taste from commercially available products and using it as a source of lactic acid bacteria, yogurt with almost the same taste can be easily produced. As a raw material milk container, a commercially available milk container can be used as it is. After the lactic acid bacteria are added to the raw milk, it is placed on a saucer, covered with the yogurt production device 12 of the present invention shown in FIG. 2 (b) to the state shown in FIG. 2 (c), and the plug 8 is connected to an outlet. The raw milk container is heated to 30 to 40 ° C.
After 0 hours, yogurt can be obtained.

The sheet heating element used in the yogurt manufacturing apparatus of the present invention has a positive temperature coefficient characteristic. FIG. 3 is an example of a positive temperature coefficient characteristic curve. The positive temperature coefficient characteristic is that when the temperature of the heating element rises due to energization, the electrical resistance value of the heating element sharply increases, the amount of flowing electricity decreases, and when the temperature of the heating element falls due to heat radiation, the heating element The electric resistance value decreases, the amount of flowing electricity increases, and heat is generated again. The sheet heating element used in the present invention has a ratio between the maximum electric resistance and the electric resistance at room temperature of 1,000 or more,
The temperature at which the electric resistance value is 10 times the electric resistance value at room temperature is preferably 40 to 80 ° C. The positive temperature coefficient characteristic shown in FIG.
And the temperature at which the electric resistance at 25 ° C. is 10 times the electric resistance at 50 ° C. is 50 ° C., and the electric resistance rapidly rises from around 40 ° C. as the temperature rises. The value increases. Therefore, when the yogurt maker equipped with such a sheet heating element is directly connected to a household 100 V AC power supply, the inside of the yogurt maker is automatically maintained at 30 to 40 ° C. and provided with a temperature control mechanism. It is possible to stably maintain the raw milk container at an appropriate temperature of 30 to 40 ° C. for a long time without using expensive equipment such as a thermostat and without the risk of an accident due to overheating.

The sheet heating element used in the present invention is formed into a heating resistance sheet by molding a heating composition in which conductive particles are mixed with a thermoplastic resin by extrusion molding or the like, and a pair of electrodes is provided on both edges of the sheet. It can be manufactured by providing a wire. The thermoplastic resin used is not particularly limited, but is preferably a resin having crystallinity, for example, polyethylene, polypropylene, polybutene, poly-4-methylpentene-1, ethylene-propylene copolymer, ethylene-acetic acid Vinyl copolymer, ethylene-acrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-
Vinyl chloride copolymer, polyvinyl acetate, polyvinyl acetal, polyvinyl butyral, nylon 6, nylon 66, nylon 610, polyethylene terephthalate,
Examples thereof include polybutylene terephthalate. Among them, ethylene-ethyl acrylate copolymer, ethylene-vinyl acetate copolymer and low density polyethylene can be particularly preferably used. There are no particular restrictions on the conductive particles used in the production of the heat generating resistance sheet, and examples thereof include carbon black, graphite, metal powder, metal oxide powder, and carbon fibers. Among them, carbon black can be particularly preferably used. Examples of the carbon black include acetylene black, oil furnace black, and thermal black. The carbon black used preferably has a particle size of 10 to 200 μm, more preferably 20 to 100 μm. If the particle size of the carbon black is less than 10 μm, the positive temperature coefficient characteristics may be reduced. If the particle size of the carbon black exceeds 200 μm, the electric resistance value may be too large.

[0008] In the heating resistance sheet constituting the planar heating element used in the present invention, the ratio of the thermoplastic resin to the conductive particles is not particularly limited, but is 10:90 to 80: 2 by weight.
It is preferably 0, more preferably 55:45 to 75:25. If the weight ratio of the thermoplastic resin to the conductive particles is less than 10:90, the positive temperature coefficient characteristics may not be sufficiently exhibited. If the weight ratio of the thermoplastic resin to the conductive particles exceeds 80:20, the planar heating element may not generate enough heat. A mixture of the thermoplastic resin and the conductive particles may be mixed with a crosslinking agent to form a heat generating resistance sheet. By blending and molding a crosslinking agent, crosslinking can be caused in the thermoplastic resin component, and the mechanical strength of the heat generation resistance sheet can be improved. The crosslinking agent to be used is not particularly limited, and examples thereof include benzoyl peroxide, lauroyl peroxide, dicumyl peroxide, and t-butyl peroxybenzoate. In the present invention, there is no particular limitation on the pair of electrode wires provided on both edges of the heating resistor sheet.
Conductive wires such as tin-plated copper wires and aluminum wires can be mentioned. It is preferable that one electrode wire or a plurality of parallel wires are passed through a die of an extruder and extruded together with a mixture of a thermoplastic resin and conductive particles to form a coated wire. It is preferable that the composition comprising the thermoplastic resin and the conductive particles constituting the coated wire has an electric resistance value equal to or lower than that of the heat generation resistance sheet. If the electrical resistance of the composition of the thermoplastic resin and the conductive particles constituting the coated wire is larger than the electrical resistance of the heating resistor sheet, there is a disadvantage that heat is generated in the coated wire portion more than the heating resistor sheet. The pair of coated wires can be joined to both edges of the heat-generating resistance sheet by heat fusion or the like.

In the present invention, the sheet heating element may be provided with an exterior sheet. There is no particular limitation on the exterior sheet used, and examples thereof include a polyethylene terephthalate film, a nylon film, a polycarbonate film, a vinylidene chloride film, a polyethylene film, and a polypropylene film. By covering both surfaces of the sheet heating element with the outer sheet, the beauty and safety of the yogurt manufacturing device can be further enhanced. In the yogurt manufacturing apparatus of the present invention, a foamed plastic layer can be provided outside the planar heating element. The foamed plastic layer to be used is not particularly limited, and examples thereof include sheet materials made of polyethylene foam, polypropylene foam, polystyrene foam, polyvinyl chloride foam, polyurethane foam, and the like. By providing a foamed plastic layer on the outside of the sheet heating element, the heat insulating property is enhanced, the amount of power consumption is reduced, and the temperature inside the yogurt maker is stabilized, so that yogurt of constant quality can be manufactured. The yogurt manufacturing apparatus of the present invention has a simple structure, does not require a temperature controller and the like, and has no risk of failure due to disconnection or overheating accident, and keeps the raw milk at 30 to 40 ° C. necessary for manufacturing yogurt. It is possible to easily and safely produce homemade yogurt satisfying the demands of genuine and handmade in a general household, using a combination of raw milk and lactic acid bacteria that suits the taste. .

[0010]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, which should not be construed as limiting the present invention. Example 1 From a rigid vinyl chloride plate having a thickness of 1.0 mm, a cylindrical material having a shape shown in FIG. 1 and one side having dimensions of 85 mm × 240 mm and a lid having dimensions of 85 mm × 85 mm was prepared. A 0.8 mm thick polyethylene foam sheet was cut into the same shape and attached to the inner surface of the material. Width 2
A power cord is connected to one end of each of a pair of electrode wires of a sheet heating element [Idemitsu Planar Heater, Idemitsu Kosan Co., Ltd.] having a thickness of 00 mm, a heating resistor sheet width of 160 mm, and a length of 320 mm. The connection part was fixed using epoxy resin, and a plug for connecting to an external power supply was attached to the end of the power cord. The sheet heating element was attached to the inner surface of a polyethylene foam sheet attached to the above-mentioned tubular material, and assembled into a tubular article having the shape shown in FIG. 2 (b) to produce a yogurt manufacturing apparatus of the present invention. Separately, from a rigid vinyl chloride plate with a thickness of 1.0 mm, the dimensions of one side are 75 mm x 10 mm and the dimensions of the bottom are 75 mm x 7
Cut out the pan material of 5mm, and on the inner surface of this material,
Fig. 2 By cutting out a 0.8mm thick polyethylene foam sheet into the same shape, attaching it, and assembling it.
A saucer having the shape shown in FIG. 100 ml of milk was taken out of a commercially available 1-liter milk container containing a paper pack, and 70 ml of commercially available plain yogurt was added thereto, followed by stirring and mixing to make the mixture uniform. A sensor for temperature measurement was inserted so as to be located at the center of the milk container, and the opening of the milk container was fixed with a clip. The sensor for temperature measurement was connected to a temperature recorder. This milk container is placed on a saucer placed on a wooden table as shown in FIG. 2 (a),
In the state shown in (c), the power cord was connected to a 100 V power supply from 6:00 pm to 6:00 am the next day. Room temperature dropped from 25 ° C to 12 ° C between 6pm and 6am,
The temperature inside the milk container was almost constant in the range of 36 to 40 ° C. In addition, the milk in the container was fermented to produce delicious yogurt.

[0011]

The yogurt manufacturing apparatus according to the present invention has a simple structure, does not require a temperature controller or the like, does not cause a failure due to disconnection or an overheating accident. The raw milk can be kept warm and fermented, so in a general household, using a combination of raw milk and lactic acid bacteria that suits your taste, you can easily and safely produce homemade yogurt that meets the demands of real and homemade. You can make your own.

[Brief description of the drawings]

FIG. 1 is a developed view and a cross-sectional view of one embodiment of a yogurt manufacturing apparatus according to the present invention.

FIG. 2 is a diagram illustrating the use of a yogurt manufacturing apparatus according to the present invention.

FIG. 3 is an example of a positive temperature coefficient characteristic curve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Side surface 2 Cover surface 3 Planar heating element 4 Heating resistance sheet 5 Electrode wire 6 Insulating sealing material 7 Power cord 8 Plug 9 Outer sheet 10 Raw material milk container 11 Receiving tray 12 Yogurt maker

Claims (5)

[Claims] 1. A yogurt manufacturing apparatus characterized by comprising a tubular heating element having a sheet-like heating element having a positive temperature coefficient characteristic on an inner surface thereof. 2. A sheet heating element comprising: a heating resistor sheet formed by mixing conductive particles with a thermoplastic resin; and a pair of electrode wires provided on both edges of the sheet. Item 4. The yogurt manufacturing device according to Item 1. 3. The method according to claim 1, wherein the weight ratio of the thermoplastic resin to the conductive particles is 1
The yogurt manufacturing device according to claim 2, wherein the ratio is from 0:90 to 80:20. 4. The yogurt manufacturing apparatus according to claim 1, wherein the sheet heating element comprises an exterior sheet. 5. The yogurt manufacturing apparatus according to claim 1, wherein the tubular article has a foamed plastic layer outside the sheet heating element.