JPS59205942A - Preservation of coffee - Google Patents

Abstract

PURPOSE:To enable the preservation of coffee without deteriorating the original flavor of coffee, by adding a hydraulic setting fine powder to granular slaked lime having adjusted water content, putting the resultant composition into a packaging material having a specific moisture permeability, and sealing the product together with roast 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 slaked lime to 1-35%, especially 10-30%. The treated slaked lime is mixed with hydraulic setting fine powder finer than 100 mesh. The amount of the powder is 0.1-20% of the mixture. The obtained composition is sealed in 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, and the container, etc. is substituted with inert gas or evacuated and sealed to preserve the coffee.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a packaging bag in which a composition obtained by subjecting improved TQ 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. This is a method of preserving coffee in which the coffee is placed in a bag or container and the inside of the container is replaced with an inert gas or vacuum degassed.

After roasting, coffee is stored in a sealed bag, and the carbon dioxide gas generated by the coffee puts internal pressure on the outer bag, which often causes problems such as the bag becoming thick (bulging) and eventually breaking.

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, punching micron holes in the bag.

However, the drawback of this method is that the aromatic components, which are the lifeblood of coffee, escape outside along with the acid 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 3IIIi as a starting material, and impregnates it with water or a humidity conditioning solution in which an inorganic compound or an organic compound is dissolved in water to adjust the water content to 1 to 35%. A composition prepared by adding 0.1 to 20% of the total hydrated coagulable fine powder, which is finer than mesh, is laminated with a plastic film on one side of oil-repellent paper, and the carbon dioxide gas permeability is 500 dry CC/rd・h.
r-atm (ASTM D143420°C) or higher
Nikatsu moisture permeability 17g/rd °24hrs (JIS
Z 0208) Preservation of coffee by placing roasted coffee in the following packaging material and placing it in a substantially non-porous bag or container, purging the container with an inert gas or deaerating it with Minoku, and sealing it. It's a method.

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. Humidity control liquid refers to a liquid in which an appropriate substance is dissolved in water and is capable of adjusting the equilibrium humidity, preferably 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, Na13r, , l<1. CaC
l2, MgCl2, BaCl2, Na2SO4, KNO
3, K3P O4, K 2 II P O4, Na
2 CO3, K2CO3, etc., among them NaCl, N
Alkali metal or alkaline earth metal halides exemplified by aBr, Ca (:, l 2 , M g C12, etc.) are preferred. Organic compounds include glycerin, polyhydric alcohols exemplified by ethylene glycol rings, and sodium acetate. , organic salts such as magnesium acetate, etc. Such aqueous solutions can be used to adjust the equilibrium humidity over a wide range of humidity by adjusting the concentration. However, an example is a method in which a predetermined amount of water or a humidity control liquid is sprinkled on the surface of granular slaked lime to mix and disperse it.In this case, the moisture content of granular slaked lime is 1 to 35%, preferably 10 to 30%. It is.

The hydration coagulable fine powder preferably has a particle size of less than 100 mesh, and includes gypsum, calcined gypsum, and cement. ), preferably in an amount of 1 to 10%, the effect of preventing agglomeration of water-containing granular slaked lime can be changed, and the carbon dioxide absorption capacity can 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 its mechanical suitability in the event of a puncture.

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, simply wrapping it in a breathable film will not allow it to be roasted. There are no words to preserve coffee.

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 permeability of 500 dry CC.
/ rd-hr-atm (^STM old 43420
'c) or above and moisture permeability 17g/% ・24hrs
(JIS Z 0208) and below, and is a packaging material. For example, as a plastic film, carbon dioxide gas permeability is 500 dry CC/rd/hr-atm (
ASTM 0143420℃) or higher, moisture permeability 17g/
rrl ・24hrs (JIS Z 0208
) The following films, specifically polyolefin films or modified polyolefin films exemplified by polyethylene film, polypropylene film, polybutadiene film, ethylene-butadiene copolymer film, ethylene-vinyl acetate copolymer film, ionomer film, etc. Among the other films exemplified by cellulose acetate films, single films or laminated films of two or more kinds of films having carbon dioxide gas permeability and water vapor permeability adjusted outside 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 gas 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. As a packaging material, 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 (
15 μ)/ethylene-vinyl acetate copolymer film (20
μ), oil-repellent paper/polypropylene film (20μ) are suitable. The carbon dioxide permeability of the packaging material is ASTM D14.
34 (20℃) 500dry CC/rd・hr
-atm or higher, preferably 1000 dry CC/
rrc ・hr-atm or more.

Oil-repellent paper is paper that is oil-repellent, and can be treated with an oil-repellent added during the paper-making process, applied with an oil-repellent after paper-making using a size press, coater, graphia printing, etc., or treated with both. The oil repellent is preferably a fluorine-based one.

Examples include Azahi Guard and Scotch Guard (product names). Oil repellency is measured using the 3M Kit method (TAP
PI Routine Control Te5t
RC33B (American standard for paper) is preferably 4 or more, especially 7 or more. The thickness of the oil-repellent paper is preferably 50-120μ.

The above-mentioned package) has low moisture permeability, excellent water retention in the composition even in the presence of dry coffee beans, and exhibits suitable carbon dioxide gas absorption ability. The moisture permeability is 17 g/rrf・24 hrs or less, preferably 10
g/td ・24hrs or less.

The composition-enclosed bag and roasted coffee prepared as described above are placed in a bag or airtight container made of a substantially non-porous film, and the air is purged with an inert gas (for example, nitrogen gas is used) or degassed under vacuum. and enclose it.

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 the coffee can be effectively roasted! The quality of coffee can be maintained.

Examples will be described below.

Example 1 32 parts of water was impregnated into 100 parts of granular slaked lime having a particle size of 0.5 to 3, and then 10 parts of gypsum was mixed to coat the surface of the granules.

3.5 g of this granular material was placed in 11 bags (size 50 mm x 50 mm) made of the following packaging material.

Packaging material laminate composition: Oil-repellent paper / polyethylene (15μ) / lattice polyethylene (product name, 1] Ishiwarifu) / polyethylene (20m1) (holes were opened from the polyethylene surface to just before the oil-repellent paper by cold opening) ) Carbon dioxide gas permeability (^STM D 143420°C) 2
500dry CC/n(-hr ・Arm moisture permeability (JIS Z 020B) 5.5 g/% ・24hrs KOP (product name) in which one bag of 11 granules was replaced with 250g of roasted coffee and 250ml of nitrogen gas.
The sample sealed in a PIJJ bag (specimen-1) 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°C) 2500 dr
y CC/ n(・hr-atm moisture permeability (JIS Z
020 & ) 20.38 / rd ・24hrs (Sample-3) KOP in which only 250g of roasted coffee was replaced with nitrogen gas
(Product name)/Sealed in a PE 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.

Example 2 Sample-5 and Sample-5 were prepared in the same manner as in Example 1 except that the inside of the KOP (trade name)/PE bag was vacuum degassed instead of nitrogen gas replacement (Example). Specimen according to 3.
6 was created.

After storing specimen-5 and specimen-6 at 25°C for 150 days,
When we observed the condition of the packaging, we found that sample No. 5 maintained almost its original shape11), but sample No. 6 had a large bulge in the bag and the side seal of the KOP/PE film had peeled off a little. The bag was on the verge of breaking.

Example 3 A predetermined amount of 100 parts of granular slaked lime with a particle size of 0.5 to 31 was impregnated with a predetermined amount, and the obtained water-containing granular slaked lime was subjected to a test in the same manner as in Example 1 (specimen-1). did. The conditions and results are shown in the table below.

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.

Comparative Example Granular slaked lime containing no water was sealed in the same magazine as used in Specimen-1 and tested in the same manner as Specimen-1. As a result, 3
The bag broke after 0 bites.

Example 4 100 parts of granular slaked lime with a particle size of 0.5 to 3 mm was impregnated with 32 parts of water, and then 5 parts of gypsum and magnesium stearate were added.
One part was added in sequence and mixed to coat the surface of the granules.

3.5 g of this granule was added to a package of oil-repellent paper/polypropylene film (20μ)) 4 [carbon dioxide permeability (8 STM)]
D 1434 20℃) 600dry CC
/ rrr-hr-atm, moisture permeability (JIS Z
0208) 12g/rd・24hrs)
It was sealed in a bag (size 50 x 50 mm) made from

One bag containing this granule is mixed with roasted coffee and two nitrogen gases.
It was sealed in a KOP (trade name)/PE bag which had been replaced with 50 ml of KOP (trade name) and left at 25°C. - 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)

[Claims] (1) Using granular slaked lime with a particle size of 0.5 to 3n as a starting material,
After impregnating it with water or a humidity control solution prepared by dissolving an inorganic compound or an organic compound in water and adjusting the moisture content to 1 to 35%,
A composition prepared by adding 0.1 to 20% of the total hydrated coagulable fine powder with a particle size of less than 100 mesosinus was laminated with a plastic film on one side of oil-repellent paper, and a carbon dioxide gas permeability of 500 dry 'CC/rd was prepared. -hr-at
m (8STM 0143420°C) or more and moisture permeability 1
7g/rd ・24hrs (JIS Z 020
8) A method for preserving coffee in which the following packaging material and roasted coffee are placed in a substantially non-porous bag or container, the inside of the container is replaced with an inert gas or vacuum evacuated, and the container is sealed ( 2) Plastic film has carbon dioxide permeability of 50
0dry CC/ra・hr・atm (A
STM 01434 20 °C) or higher, moisture permeability 1
7g/rd・24hrs (JIS Z 0
208) The method according to claim 1, which is a single film or a laminated film of two or more of the following: (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 hydrated coagulable fine powder is CaSO4 or CaSO4
・Method according to claim 1, which is 1/2 H20 or cement (6) Method according to claim 1, where the inorganic compound is an alkali metal salt or alkaline earth metal salt (7) 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.