JPS6099819A - Gas replacing packaging method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to gas exchange packaging for the purpose of deoxidizing a powder or granular material to be packaged, supplying it together with an inert gas into a packaging container, and then packaging it in a normal manner. It is about the method.

Traditionally, packaging methods for powdered and granular foods include vacuum packaging methods that remove most of the air in the packaging containers, and A method of packaging by replacing the gas with an inert gas (for example, nitrogen gas) has been known.

However, in the former case, the gas permeability of the packaging material must be completely eliminated, which not only places significant restrictions on the packaging material, but also poses the problem that complete degassing is difficult when packaging powder or granules.

In addition, in the latter case, the inside of the packaging container is deaerated and then inert gas is blown into the container to seal it, but it is difficult to replace all the air contained between the powder particles with inert gas, and any residual There was a problem in that the amount of oxygen was insufficiently reduced.

However, this invention provides a packaging method in which a deoxidizing agent is mixed into the granular material to be packaged and the powder is treated with 12 oxygen in advance.Then, the powder is supplied together with an inert gas into a packaging container, and the container is then sealed in the usual manner. Since the packaging container is filled with inert gas, and the inside of the chute through which the powder is fed is kept at a positive pressure by the inert gas, there is no risk of outside air being inhaled, and the powder is released. The body can be maintained in a sufficient deoxygenated state,
This solves the conventional problems mentioned above.

That is, this invention will be explained based on the drawings.

Powder 1 to be packaged (for example, milk powder) is placed in a hopper 2 of an appropriate size that can be sealed in advance, a predetermined amount of oxygen scavenger is mixed in, the package is sealed, and deoxidation treatment is carried out for at least one day and night (24 hours). .

By this treatment, most of the oxygen in the air present in the microscopic spaces of the particles 1 is absorbed by the oxygen scavenger. During the deoxidation treatment, the mixture is allowed to stand still, but the treatment time can be shortened by supplementary stirring and shaking of the raw material powder.

The granular material 1 treated with +112 oxygen is intermittently weighed by a measuring device connected to the lower part of the popper 2,
The nitrogen gas blown out by the nozzle 5 is transferred to the transfer tube 3 and then supplied into the packaging material via the supply tube 4. The transfer tube 3 and the supply tube 4 have a sealed structure and form a supply path. The transfer pipe 3 has two relay chutes 3a, 3
b are connected, and each relay shoe 1-3a, 3b
Nozzles 5a and 5b for blowing gas are respectively faced.

The connection between the relay chutes 3a and 3b is the relay chute 3.
Since the lower end of the shoe a is eccentrically faced to the upper end of the next relay shoe 1-3b, it is possible to prevent the powder or granular material 1 from rolling up during filling.

The powder 1 transferred to the hopper 2 passes through the supply path together with nitrogen gas blown through the gas blowing nozzles 5.5a and 5b, and is supplied to the cylindrical packaging material 6. Therefore, the inside of the packaging material G and the inside of the 01 supply pipe 4 are in a nitrogen gas atmosphere. The cylindrical packaging material 6 is made by sequentially forming a band-shaped packaging film 7 supplied from a film supplying unit into a cylindrical shape using a hot plate 8 and a roller 9, and inserting a supply pipe 4 into the core part to form a cylindrical packaging film 7 on a hot plate 1.
Seal the bottom with 2. In this way, a fixed amount of powder 1 is supplied, and the packaging material 6 is moved downward by one bag, and the upper part is sealed with the hot plate 12 and the lower part with the hot plate 13 to form a packaging bag. Further lower the bag by one bag and cut the sealed part with the cutter 10.
If the material is cut with a cutting tool, a packaging bag 11 for the powder or granular material is produced. 14 in the diagram
is the exhaust pipe.

In the above, since nitrogen gas is blown through three nozzles, the flow rate can be made as slow as possible to provide the necessary amount of gas (for example, three times the bag capacity or more). The appropriate number of nozzles in the above is two to three. Furthermore, increasing the cross section of one nozzle is not preferable because the amount of gas increases rapidly during supply. Said nozzle 5+5”+5
The same amount of gas can be blown from b or the amount of gas from the lower nozzle can be increased. In the above embodiments, the use of a hopper to store the powder or granular material has been described, but it is of course possible to use not only a hopper but also a container, a bag, or the like.

Furthermore, the effects of this invention will be explained with reference to the attached table.

First, Table 1 does not show the nitrogen gas blowout and residual oxygen rate in stick pack packaging.

Conditions: 1) Filling amount: 15g/bag 2) Filling capacity: 30 bags/min 3) Number of nitrogen gas blowing nozzles: 3 Table 7 (Note) Measured value on the 9th day after filling The blowout amount is the total amount of the three nozzles.

In addition, in stick pack packaging, [conditions for pre-treatment effect using oxygen scavenger for filling raw material powder = 1) Filling amount 8.8 (]/pack 2) Number of nitrogen gas blowing nozzles 3) Nitrogen gas blowing amount ( Total) 30 L,/m1n4)
The 115211 material used was the product name ``Ageless'' (Mitsubishi Gas Chemical Co., Ltd.). In the injection method, the residual oxygen rate is around 3% in the best case, 5% to 12% on average, and nearly 20% in the worst case, which may be unfavorable for product preservation. there were.

However, according to the present invention, the residual oxygen percentage does not exceed 1% and is maintained at around 0.3 to 0.8%, resulting in an extremely high deoxidizing effect.

In the embodiments of this invention, nitrogen was used as the inert gas, but the inert gas is not limited to this, and carbon dioxide or a mixed gas of nitrogen and carbon dioxide may also be used.

In the above embodiments, the packaging method in stick pack packaging has been described, but the same method can be used when packaging in metal (h).

Further, although the gas blowing nozzles are shown facing each chute of the content conveyance path, the present invention is not limited to this, and a plurality of gas blowing nozzles may be appropriately positioned so as to face the supply path.

In other words, according to the present invention, after preliminarily deoxidizing the powder by mixing an oxygen absorber into the powder and granular material to be packaged, the powder and granular material to be packaged is supplied in a fixed amount from a filling hopper into a packaging container together with an inert gas, so that it can be packaged. Since the powder and granules are kept in an inert gas atmosphere, residual oxygen is kept as low as possible.

Next, embodiments of this invention will be described.

25kg of milk powder and 160g of oxygen absorber in a breathable packaging bag
and leave it standing or perform deoxidation treatment for 24 hours with slow stirring. This treatment reduces the residual oxygen rate to 1% or less. Next, this milk powder is weighed to 8.8 g and sent into a packaging bag together with nitrogen gas. In this case, the nitrogen gas volume to be blown should be at least three times the capacity of the packaging bag. In other words, a fixed amount of milk powder enters the packaging bag through a nitrogen gas atmosphere, but since the packaging bag is also filled with nitrogen gas (the gas atmosphere is under positive pressure), there is no risk of inhaling outside air, and the milk powder escapes. There is no exposure to air after acid treatment. The residual oxygen rate of the milk powder packaged as described above was 1% or less.

[Brief explanation of drawings]

FIG. 1 is a partially sectional front view of an apparatus for carrying out the present invention, and FIG. 2 is a partially enlarged perspective view of a cylindrical packaging forming portion. 1... Powder to be packaged 2... Hopper 5.5a,
5b... Nozzle 6... Tubular packaging material 7... Packaging film Patent applicant Meiji Milk Channel Co., Ltd. Agent Shoji Suzuki Procedural Amendment (voluntary) November S, 1980 1, Indication of the case Relationship with Patent Application No. aooaoo case of 1939
Patent Applicant Name <41J) HA Dairy Products Co., Ltd. 4, Agent (Postal Code 160) Address Tokumei Building, 29 Shinanomachi, Shinjuku-ku, Tokyo Showa Year, Month, Day 2 Contents of Amendment (A) Akira mJ*J Page 76 The line that says "processed powder and granule" should be corrected to "processed powder and granule." - In Myeongsho, on page 4, line 1j, it says "deoxidation treatment", but it has been corrected to "deoxygenation treatment".

Claims (1)

[Scope of Claims] 1. Gas replacement characterized in that the powder or granular material to be packaged is mixed with an oxygen absorber to undergo deoxidation treatment in advance, and then the powder or granular material is transferred into a packaging container together with an inert gas. Packaging method 2, gas replacement packaging method 3 according to claim 1, in which the inert gas is nitrogen gas or carbon dioxide gas, claim 1, in which the inert gas is blown into multiple locations separately Gas exchange packaging method 4, gas exchange packaging method according to claim 1, wherein the packaging container is a bag made of film material or a metal can.