JPS59205944A - Preservation of coffee - Google Patents

Abstract

PURPOSE:To enable the preservation of coffee in high quality without lowering the flavor, by adding hydraulic setting fine powder to granular slaked lime impregnated with a moisture-controlling liquid, putting the resultant composition in a packaging material having specific CO2 permeability and moisture permeability, and sealing the product together with roasted coffee in a gas impermeable bag, etc. CONSTITUTION:Granular slaked lime having particle diameter of 0.5-3mm. is impregnated with water or a moisture-controlling liquid obtained by dissolving an inorganic compound (e.g. NaCl) or an organic compound (e.g. glycerol) in water to adjust the water-content of the lime to 1-35%. The treated granular slaked lime is mixed with 0.1-20%, based on the whole composition, of hydraulic setting fine powder (e.g. gypsum) finer than 100 mesh, and 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. The product is sealed together with roasted coffee in an essentially gas-impermeable bag or container in the presence of air to effect preservation of the coffee.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a packaging bag in which a composition obtained by subjecting improved granular slaked lime to a specific processing treatment and sealed in a specific breathable packaging material, and roasted coffee in a substantially non-breathable packaging bag. A method of preserving coffee in which it is sealed and stored in a bag or container in the presence of air.

When coffee is sealed and stored in a bag after roasting, internal pressure is applied to the outer bag due to the carbon dioxide gas generated from the coffee, causing it to swell and eventually break.

Conventionally, when roasted coffee is stored in a bag, in order to prevent the above-mentioned problem, measures have been taken to allow the generated carbon dioxide to escape by, for example, making micro pinholes in the bag.

However, the drawback of this method is that the aroma, which is the lifeblood of coffee, 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 uses granular slaked lime with a particle size of 0.5 to 3 fins as a starting material, and impregnates it with water or a humidity control solution in which an inorganic compound or an organic compound is dissolved in water to adjust the moisture content to 1 to 35%. A composition prepared by adding 0.1 to 20% of the total hydrated coagulable fine powder finer than 100 mesh is laminated with a plastic film on one side of oil-repellent paper, and the carbon dioxide gas permeability is 500 dry CC/rrr・hr. -at
m (ASTM D143420℃) or higher and moisture permeability 17g/nl ・24hrs (JIS Z 02
0B) A method of preserving coffee characterized by storing roasted coffee enclosed in the following packaging material in a substantially air-impermeable bag or container, tightly sealed in the presence of air. .

In the present invention, the granular slaked lime is granular with a particle size of 0.5-3.

The humidity control liquid is used to improve the water retention properties of the composition. The humidity control liquid is a liquid in which an appropriate substance is dissolved in water, and is capable of adjusting the equilibrium M degree, preferably an equilibrium humidity of 3.
An aqueous solution having an equilibrium moisture content 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, Kl, CaCl2,
MgCl2, BaCl2, Na25O-1KNO3,
K3PO4, K2HPO4, Na2CO3, K2CO3
etc., among them NaCl, NaBr, 'Ca C1
Preferred are alkali metal or alkaline earth metal halides such as 2, M g Cl 2 and the like. Examples of the organic compound include polyhydric alcohols such as glycerin and ethylene glycol, and organic salts such as sodium acetate and magnesium acetate. By adjusting the concentration of such an aqueous solution, it is possible to control the equilibrium humidity within a wide range. There are no particular limitations on the method for impregnating the moisture control liquid with water, but an example is a method in which a predetermined amount of water or humidity control liquid is sprinkled onto the surface of granular slaked lime, mixed and dispersed. In this case, the moisture content of the granular slaked lime is 1 to 35%, preferably 10 to 30%.

The hydration coagulable fine powder preferably has a particle size of less than 100 mesosinus, and includes gypsum, calcined gypsum, and cement. If added and mixed preferably in an amount of 1 to IO%, the effect of preventing agglomeration of water-containing granular slaked lime will be changed, and the carbon dioxide absorption capacity will also be stabilized. Furthermore, several percent of a blanching agent such as magnesium stearate or talc may be added to improve the fluidity of the composition and improve mechanical suitability during banking.

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 has unique properties, it cannot be roasted simply by wrapping it 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/ m・hr-atm (8 STM 0
1434 (20℃) or higher and moisture permeability 17g/r
It is a packaging material that is rr ・24hrs (JIS Z 0208) or less. For example, as a plastic film, carbon dioxide gas permeability is 500dryCC/rd-h+”
ATM (ASTM 0143420℃) or higher film, moisture permeability 17g/m・24hrs (J
IS Z 0208) The following films, specifically, for example, polyethylene film, polypropylene film,
Polyolefin films such as polybutadiene films, ethylene-butadiene copolymer films, ethylene-vinyl acetate copolymer films, ionomer films, modified polyolefin films, and other films such as cellulose acetate-I films. Examples include a single film or a laminated film of two or more types with carbon dioxide permeability and moisture permeability adjusted within the above ranges.

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. As long as the carbon dioxide permeability and moisture permeability of the laminated product are adjusted to fall within the above range, it can be used. It is preferable to carry out the hole-opening treatment until just before the plastic film layer is penetrated. Examples of packaging materials include oil-repellent paper/polyethylene film (15μ)/grid polyethylene/polyethylene film (20μ), oil-repellent paper/polyethylene film (15μ)/ethylene-butadiene copolymer film (20μ), oil-repellent paper/polyethylene film (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 A STM
D 500dry CC/c at 1434 (20℃)
d-hr ・atm or more, preferably 1000 dry
CC/nl ・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 Azahigard and Scotchguard (product names). Oil repellency is measured using the 3M Gift method (TAPP
l,, Routine Control Te5t
RC338 (American standard for paper) is preferably 4 or more, particularly 7 or more. The thickness of the oil-repellent paper is preferably 50-120μ.

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 based on the method of Month 5Z0208,
17 by increasing the amount of anhydrous calcium chloride through a packaging material in air at a temperature of 25°C and a relative humidity of 75%.
g/+d・24t+rS or less, preferably 10g/m・
It is 24 hours or less.

The composition-enclosing bag prepared as described above and the roasted coffee are sealed and stored in a bag or airtight container made of a substantially non-breathable film in the presence of air.

According to the coffee preservation method of the present invention, it is possible to continue absorbing and removing carbon dioxide 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 1 100 parts of granular slaked lime with a particle size of 0.5 to 3 m11 was impregnated with 32 parts of water, and then 10 parts of gypsum was mixed to coat the surface of the granules.

3.58 ml of this granular material was placed in a bag (size 50 mm x 5 (Jim)) made of the following packaging material and sealed.

Packaging material laminate composition: Oil-repellent paper / polyethylene (15 μ) / lattice polyethylene (product name: 9-sided Warifu) / polyethylene (20 μ) (Cold-opened immediately before reaching the oil-repellent paper from the polyethylene surface) ) Carbon dioxide permeability (ASTM D 143420°C) 2
500dry CC/n(-hr -aLm Moisture Permeability (JIS Z 0208) 5-5 g/m・24hrs One bag containing this granule was roasted and roasted together with 250g of KOP (
Product name)/PEJ! (Sample-1) sealed in a bag of
) was left at 25°C.

For comparison, similar tests were conducted on the following samples to compare the storage conditions and 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 D 143420℃) 2500dry
CC/rd・hr-aLm moisture permeability (JIS Z
0208) 20.3g/m・24hrs (Sample-3) KOP only 250g of roasted coffee (Product name)/PE
sealed in a plastic bag.

(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.

Table 1 Carbon dioxide concentration Example 2 100 parts of granular slaked lime with a particle size of 0.5 to 3 mm was impregnated with a predetermined amount of humidity control liquid, and the obtained water-containing granular slaked lime was used to prepare Example 1 (sample -=1). It was tested in the same manner. The conditions and results are shown below.

After storage at 25° C. for 150 days, the external morphology of all cases remained almost the same. The quality of the coffee was also the same for each sample, and no significant difference from sample-1 (Example 1) was observed.

Comparative Example: Same package H as used in Sample-1 using granular slaked lime that does not contain water.
It was sealed and tested in the same manner as Specimen-1. As a result, 3
The bag broke in 0 days.

Example 3 100 parts of granular slaked lime with a particle size of 0.5 to 3 n+ m to 3 parts of water
Then, 5 parts of gypsum and 1 part of magnesium stearate were sequentially added and mixed to coat the surface of the granules.

Spread 3.5 g of this granular material on a sheet of oil-repellent paper/polypropylene film (20μ) [carbon dioxide permeability (8 STM D
1434 20°C) 600dry CC
/ m・br-atm, moisture permeability (JIS Z
0208) 12g/rd/24hrs) was sealed in a bag (size 50 x 50 mm).

Roast 1 monthly bag of this granular material and KOP it with 1 coffee.
(Product Name)/It was sealed in a PEMO bag and left at 25°C.

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

Claims (1)

[Scope of Claims] (1) Starting material is granular slaked lime with a particle size of 0.5 to After adjusting the composition to 0.1 to 20% of the total hydrated coagulable fine powder with a particle size of less than 100 mS, a plastic film is laminated on one side of oil-repellent paper and carbonated. Gas permeability 500dry CC/ m-hr-ai
m (to STM old 43420°C) or more and moisture permeability 17g
/rn ・24hrs (JIS Z 020B
) In the presence of air, place the roasted coffee and the following enclosed in the packaging material in a substantially non-breathable bag or container,
A method of preserving coffee characterized by storing it in a sealed container (2) Plastic film has a carbon dioxide gas permeability of 500 d
ry CC/% ・hr-arm (ASTM D
14'3.420°C) or more, moisture permeability 17g/m ・
24hrs (JIS Z 0208) or less, a single film or a laminated film of two or more types of the method according to claim 1 (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 a laminate of one or more of polyethylene film, polypropylene film, polybutadiene film, ethylene-butadiene copolymer film, ethylene-vinyl acetate copolymer film, ionomer film, cellulose acetate film. (5) The method (5) according to claim 2, wherein the hydrated coagulable fine powder is CaSO4 or CaSO4
- 1/2H20 or cement, the method according to claim 1 (6) the method according to claim 1, where the inorganic compound is an alkali metal salt or alkaline earth metal salt (7) an organic compound is a polyhydric alcohol or an organic acid salt. (8) The method according to claim 1, in which a blanching agent is added to the composition. (9) Stearin is used as a blanching agent. The method according to claim 8 using magnesium acid, calcium stearate, talc, perlite or silica.