JPS59205943A - Preservation of coffee - Google Patents

Abstract

PURPOSE:To keep the quality of roasted coffee effectively without lowering the flavor, by adding a fine filler to water-containing granular slaked lime obtained by granulating slaked lime impregnated and mixed with a moisture-controlling liquid, sealing the resultant composition in a packaging material having a specific moisture permeability, and sealing the product together with roasted coffee in a gas-impermeable bag, etc. CONSTITUTION:Powdery slaked lime is mixed with water or a moisture-controlling liquid obtained by dissolving an inorganic compound (e.g. NaCl) or an organic compound (e.g. glycerol), and granulated to obtain a water-containing granular slaked lime having a water-content of 1-35%. The granular slaked lime is mixed with 0.1-20%, based on the whole composition, of a fine filler fine than 100 mesh. The resultant composition is put into a packaging material having a CO2 permeability of >=500 dry-cc/m<2>.hr.atm and a moisture permeability of <=17g/m<2>.24hr and obtained by laminating a plastic film such as PE film to one side of an oil-repellent paper, and the product is sealed together with roasted coffee in a gas-impermeable bag or container to effect the preservation of the coffee.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a packaging bag in which a composition obtained by subjecting powder or bundled slaked lime to a specific processing treatment and sealed in a specific air-permeable packaging material, and roasted coffee in a substantially non-air-permeable packaging bag. This is a method of preserving coffee in which the coffee is placed in a container such as a bag or can and the inside of the container is replaced with an inert gas or vacuum degassed.

After roasting, when coffee is stored in a sealed bag, internal pressure is applied to the outer bag due to the carbon dioxide gas released from the coffee.
We often see problems such as the bags swell to a large extent and eventually break.

Conventionally, when storing roasted coffee in a bag, in order to prevent the above-mentioned problem, measures have been taken to allow the generated carbon dioxide to escape, such as by puncturing the bag with micro pinballs. However, the drawback of this method is that the aromatic content, which is the lifeblood of l-hyaluric acid, escapes with the carbon dioxide gas. As a result, the quality of coffee, which is a luxury item, deteriorates and the value of the product accelerates.

In view of the above-mentioned problems with the conventional methods for preserving coffee, we have conducted extensive research into a method for preventing the outer packaging from breaking due to generated carbon dioxide gas without impairing the original aroma of coffee, resulting in the present invention.

The present invention involves impregnating and mixing powdered slaked lime with water or a humidity control solution prepared by dissolving an inorganic compound or an organic compound in water, and granulating it into granules. 0.1 of the total finer fine filler
Laminate a plastic film on one side of oil-repellent paper with a composition containing 20% carbon dioxide gas permeability 500 dry CC/m ・t++" atm (
657M 0143420℃) and moisture permeability 17g
/n (・24hrs (JIS Z0208) or less) A coffee preservation method characterized by storing roasted coffee in a packaging material and sealing it in a substantially non-breathable bag or container. be.

The humidity control liquid is used to improve the water retention properties of the composition. Humidity control liquid refers to a liquid that can adjust the equilibrium humidity by dissolving a suitable substance in water, preferably at an equilibrium humidity of 3.
An aqueous solution with an equilibrium humidity of 0% or more, more preferably 70% or more is used.

As such an aqueous solution, a solution in which a hydrophilic inorganic or organic compound is dissolved is used, and an aqueous solution in which an inorganic compound, particularly an inorganic salt, is dissolved is preferably used. Inorganic compounds include NaCl, NaBr, KI, CaCl2, M
gCl2, BaCl2, Na2SO4,
KNO3, K3 PO4, K2 HPO4,',;Na
2 CO3, K2 CO3, etc., among them NaCl
Alkali metal or alkaline earth metal halides exemplified by NaBr, CaCl2, MgC+2, etc. are preferred. Examples of the organic compound include polyhydric alcohols such as glycerin and ethylene glycol, and organic salts such as sodium acetate and magnesium acetate.

Further, by dissolving a water-soluble polymer substance in an aqueous solution, the binding force increases when granulating powdered slaked lime, which helps in forming and stabilizing the granules. Examples of water-soluble polymer substances include polyvinyl alcohol, sodium carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, dextrin, casein, etc., and these preparations may be contained in the composition in an amount of 0.05 to 5%9. By adjusting the concentration of the wet liquid, it is possible to control the equilibrium humidity within a wide range. There are no particular restrictions on the method of impregnating with water or other related mixed liquids, but the surface of powdered slaked lime is sprinkled with a predetermined amount of water or moisture conditioning liquid, impregnated, mixed, and granulated into granules to form water-containing granular slaked lime. A method is illustrated. In this case, the moisture content of granular slaked lime is 1 to 35%,
Preferably it is 10 to 30%.

Fine fillers include magnesium stearate, calcium stearate, wax, lubricants such as talc, activated carbon, carbon blank, zeolite, hentonite,
Silica, calcium carbonate, etc. are used. In addition, the island SO
4. CaSO4.1/2+120, cement, etc. are also effectively used to stabilize the grain shape.

The particle size of the fine filler is preferably finer than 100 mesh, and the amount added to the composition is 00.1 to 20%, preferably 1 to 10%, based on the weight after addition. The fine fillers may be used in China or Germany, or two or more types may be used in combination, and by adding them, the effect of preventing agglomeration of the water-containing granular slaked lime is changed, and as a result, the sustainability of the carbon dioxide absorption ability is extended.

The above composition is wrapped in a bag made of breathable film to exhibit its ability to absorb carbon dioxide gas, but since roasted coffee i- has unique properties, it cannot be simply packaged in a breathable film. Roasted coffee cannot be stored.

The packaging material used in the present invention is made by laminating a plastic film on one side of oil-repellent paper and has a carbon dioxide gas permeability of 500 dry C.
C/rrr-hr-atm (8 STM
DI434 20'C) or higher and moisture permeability 17g/
nr ・24hrs (JIS Z 0208)
The packaging material is as follows. For example, as a plus deck film, the carbon dioxide permeability is 500dryCC/n(-h+
” aim (8sTMD14342o'c) or more,
Moisture permeability 17g/nr ・24hrs'('JIS
Z 0208 ) The following films, specifically polyolefin films or modified polyolefins exemplified by polyethylene films, polypropylene films, polybutadiene films, ethylene-butadiene copolymer films, ethylene-vinyl acetate copolymer films, ionomer films, etc. Films, other films such as cellulose acetate film, or a laminated film of two or more of them, with carbon dioxide permeability and water vapor permeability adjusted within the above ranges, may be mentioned.

The thickness of the plastic film is usually 15-50μ, preferably 20-40μ. Even if the carbon dioxide permeability and water vapor permeability of the plastic film are outside the above ranges, the plastic film may be perforated and then laminated with oil-repellent paper, or the laminated plastic film layer may be perforated. If the carbon dioxide permeability and moisture permeability of the laminate are adjusted to fall within the above ranges, it can be used. In the case of hole-opening treatment, it is preferable to perform the treatment until just before penetrating the plastic film layer. For example, oil-repellent paper/polyethylene film (15μ)/grid polyethylene/polyethylene film (20μ), oil-repellent paper/polyethylene film (15μ)/ethylene-butadiene copolymer film (25μ), oil-repellent paper/polyethylene film (25μ), etc. (15μ)/ethylene-vinyl acetate copolymer film (2
0μ) and oil-repellent paper/polypropylene film (20μ) are suitable. The carbon dioxide permeability of the packaging material is AST crystal D'1
434 (20℃) 500dry CC/rd-h
r-atw1 or more, preferably 1000 dry C (
:l/rd・hr-atm or more.

Oil-repellent paper is paper that is oil-repellent, and can include oil-repellent added during the paper-making stage, oil-repellent applied after paper-making using a size press, coater, gravure printing, etc., or both. The oil repellent is preferably a fluorine-based one.

Examples include Asahi Guard and Scotch Guard (product names). Oil repellency was measured using the 3M kit method (TAPPI).
Routine Control Te5t RC3
38, American Standard for Paper) of 4 or more, particularly 7 or more.

The above-mentioned packaging material has low moisture permeability, excellent ability to retain water in the composition even in the presence of dry coffee beans, and exhibits suitable carbon dioxide absorption ability. Moisture permeability is 17g/rrr・24hrs or less, preferably 10g, according to the method of JISZ 0208, determined by increasing the amount of anhydrous calcium chloride through the packaging material in air at a temperature of 25°C and a relative humidity of 75%.
/tl ・24hrs or less.

The composition-enclosing bag prepared as described above and the roasted coffee are placed in an airtight container such as a bag or can made of a substantially non-porous film and stored in a sealed manner. At that time, if the inside of the container is replaced with an inert gas (usually nitrogen gas) or degassed under vacuum, the storage condition will be even better.

According to the coffee preservation method of the present invention, it is possible to continue absorbing and removing carbon dioxide gas generated for a long period of time without impairing the original aroma of coffee, so there is no need to worry about the outer packaging breaking, and you can effectively preserve roasted coffee. Quality can be maintained.

Examples will be described below.

Example 1 After mixing 100 parts of powdered slaked lime and 32 parts of water, 3 parts of magnesium stearate was added and mixed to the water-containing granular slaked lime obtained by granulation, and the surface of the granules was coated.

3.5 g of this granular material was placed and sealed in a bag (size 50 mm x 50 mm) made of the following packaging material.

Packaging material laminate composition: Oil-repellent paper/polyethylene (15μ)/grid polyethylene (trade name: Ichinoseki Warifu)/polyethylene (20μ) (holes are drilled with a cold needle from the polyethylene surface to just before reaching the oil-repellent paper) Carbonic acid Gas permeability (ASTM D 143420'C)2
500dry CC/cd-hr-atm moisture permeability (J
IS Z 0208 ) 5.5 B / % ・24 hours One bag containing this granule was sealed in a KOj (product name)/PE bag with 250 g of roasted coffee, and the Chinoku specimen-1) was placed at 25°C. I left it there.

At this time, 250 ml of air was sealed in the bag.

For comparison, similar tests were conducted on the following samples to compare the storage conditions of the coffee and the quality of the coffee.

(Sample-2) The same procedure as Specimen-1 was carried out except that the packaging material of the bag containing the particulate matter was changed.

Packaging material laminate composition Bleached kraft paper/perforated polyethylene (35μ) Carbon dioxide permeability (8 STM II 143420°C) 2500t
lry cc/m-hr-arm moisture permeability (JIS Z
0208) 20.3g/m・24hrs (Sample-3) KOP only 250g of roasted coffee (product name)/l
) It was sealed in a bag made by E.

(Sample-4) One small needle hole was made in the sample-3 bag.

The storage conditions and coffee taste and aroma of each sample are shown in the table below.

Example 2 Sample-5 was prepared according to sample 1, and sample-6 was prepared according to sample-3 in the same manner as in Example 1, except that the inside of the PE bag was vacuum degassed. did.

After storing Specimen = 5 and Specimen -6 at 25°C for 150 mouths, we observed the exterior condition of the package, and found that Specimen -5 had maintained almost the same shape as when the sample was prepared, but Sample -6 had a larger bag. The side seal of the bulged KOP/PE film was slightly peeled off, and the bag was on the verge of tearing.

Example 3 100 parts of powdered slaked lime was impregnated with a predetermined amount of humidity conditioning liquid, mixed and granulated, and the obtained water-containing granular slaked lime was used.
It was tested in the same manner as (Sample-1). The conditions and results are shown in the table below. All amounts added are based on 100 parts of slaked lime.

Table 3: After storage at 25° C. for 150 days, the outer packaging remained almost unchanged. The quality of the coffee was also the same for each sample, and no significant difference from sample-1 (Example 1) was observed.

Example 4 100 parts of powdered slaked lime was impregnated and mixed with 40 parts of a 5% hydroxypropylcellulose aqueous solution, and after granulation, 5 parts of gypsum,
One part of magnesium stearate was sequentially added and mixed to coat the surface of the granules.

3.5 g of the obtained granules were packed into a packaging material of oil-repellent paper/polypropylene film (20μ) [carbon dioxide permeability (8S'r
M D 143420°C) 600dry CC/
m・br・atm % moisture permeability (JIS Z 02
08) 12g/rrr -24hrs) was sealed in a bag (size 50X 50+am).

One bag of the granules was sealed together with 250 g of roasted coffee in a KOI) (product name)/PEN bag at 25°C.
I left it there.

As a result of storage for 150 days, the results were as good as Sample-1 (Example).

Patent applicant: Mitsubishi Gas Chemical Co., Ltd. Representative Kazuyoshi Nagano

Claims (1)

[Scope of Claims] (1) Powdered slaked lime is impregnated with water or a humidity control solution in which an inorganic compound or an organic compound is dissolved in water, mixed, and granulated into granules with a water content of 1 to 35%. Granular slaked lime with a fine filler finer than 100 mesosinus to a total of 0
．． A composition prepared by adding 1 to 20% of the composition was laminated with a Plus Deck film on one side of oil-repellent paper, and the carbon dioxide gas permeability was 500 dry CC/ RL / hr-atm.
(ASTM D143420℃) or higher and moisture permeability 17
g / rd ・24hrs (JIS Z 02
08) A method for preserving coffee, which is characterized in that the coffee enclosed in the following packaging material and the roasted coffee are placed in a substantially air-impermeable bag or container and sealed and stored (2) The plastic film is Carbon dioxide permeability 500d
ry CC/rd-hr-atm (^STM 0
143420℃) or higher, moisture permeability 17g/rd・
2411rs (JIS Z 0208) or less, the method according to claim 1, which is a single film or a laminated film of two or more types. (3) The method according to claim 2, wherein the plastic film is a polyolefin film or a modified polyolefin film. Method (4) The plastic film is one or more of polyethylene film, polypropylene film, polybutadiene film, ethylene-butadiene copolymer film, ethylene-vinyl acetate copolymer film, ionomer film, and cellulose acetate film. The method (5) according to claim 2, which is a laminate, wherein the fine filler is CaSO4', CaSO4.
1/2 H20, cement, calcium carbonate, activated carbon,
(6) The method according to claim 1, wherein the inorganic compound is an alkali metal salt or an alkaline earth metal salt. The method (7) according to claim 1, wherein the organic compound is a polyhydric alcohol, an organic acid salt, or a water-soluble polymer compound, (8) the method according to claim 1, wherein a blanching agent is added to the composition. (9) Method according to Claim 8, in which magnesium stearate, calcium stearate, talc, Barley I, or silica is used as a blanching agent. The method according to claim 1, characterized in that active gas substitution or vacuum degassing is performed.