JPS5884039A - Material for packing absorbent of gaseous carbonic acid - Google Patents

Abstract

PURPOSE:To obtain a high effect of absorption of gaseous carbonic acid in a dry atmosphere, by packing the absorbent of said gas consisting of a filler contg. a proper amt. of moisture and an alkaline material with a packing material permeable to said gas by means of strict sealing. CONSTITUTION:A filler, such as zeolite, contg. a proper amt. of moisture and an alkaline substance, such as soda lime are used for an absorbent for gaseous carbonic acid, and this is sealed in strictly with a packing material permeable to said gas. A moisture content of this absorbent is generally controlled to 30- 50wt%, and preferably <=95% of the satd. water content. An amt. of absorbent to be used is preferably 1-10pts.wt. per 1pt.wt. alkaline substance. It is desirable to mix the alkaline substance and the filler uniformly, but it is not always essential, for example, first the filler and then the alkaline substance may be separately added into the bag of the packing material.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a package containing a carbon dioxide absorbent.

Conventionally, alkaline substances such as sodium hydroxide, calcium hydroxide, calcium oxide, magnesium hydroxide, and magnesium oxide have been used as carbon dioxide absorbents, and these substances are generally 9. It is applied by sealing it with packaging material.

However, in such carbon dioxide absorbents,
Although it exhibits a carbon dioxide absorption effect in a relatively moisture-rich (high humidity) atmosphere, it does not exhibit a good carbon dioxide absorption effect when used in a dry atmosphere with low humidity. For example, if roasted coffee beans are sealed and packaged in plastic film, as time passes, the carbon dioxide gas adsorbed during roasting will gradually be desorbed, and the inside of the coffee bean package will be filled with carbon dioxide gas, making it look like a The package expands as if gas was forced into the package, but even if the above-mentioned ordinary carbon dioxide absorbent is enclosed in a dry coffee bean package, Carbon dioxide gas cannot be efficiently absorbed and removed. The reason for this is thought to be that conventional carbon dioxide absorbents lack the moisture necessary to promote the reaction.

The present inventors have conducted extensive research to overcome the above-mentioned drawbacks of conventional carbon dioxide absorbents and to develop a carbon dioxide absorbent that exhibits high carbon dioxide absorption effects even in a dry atmosphere.
The present invention has now been completed.

That is, according to the present invention, there is provided a carbon dioxide absorbent packaging characterized in that a carbon dioxide absorbent made of a filler containing an appropriate amount of water and an alkaline substance is hermetically packaged with a packaging material that is permeable to carbon dioxide. The body is provided.

The alkaline substance used in the present invention is one that reacts with carbon dioxide gas and absorbs it, and any conventionally commonly used alkaline substances may be used, such as sodium hydroxide, potassium hydroxide, calcium hydroxide, and magnesium hydroxide. , metal hydroxides such as barium hydroxide, metal oxides such as calcium oxide, magnesium oxide, barium oxide, and mixtures thereof, such as soda lime. These alkaline substances are available in powdered or granular form (
It is used in various forms such as pellets.

In the present invention, the above-mentioned alkaline substance is sealed in a packaging material together with a filler that contains moisture in advance to form a product. In this case, the fillers include activated carbon, zeolite, loess, kaolin, diatomaceous earth, talc,
Organic and inorganic materials capable of retaining moisture are optionally used, such as bentonite, silica gel, perlite, alumina, magnesia, clay, calcium chloride, sodium sulfate, and the like.

In the present invention, the filler is not used in a dry state, but in the form of a hydrated product, with an appropriate amount of moisture added in advance. The water content of the filler varies depending on the type of filler, but is generally 10% by weight or more, preferably 20% by weight.
Above, in particular 30 to 50% by weight. The water content of the filler is preferably at most 95% of the saturated water absorption (maximum water absorption when the filler absorbs water). A filler having a water content in such a range has fluidity without causing filler particles to stick to it, so it is easy to mechanically fill the filler into a packaging bag. The filler is used in the form of powder or granules, preferably in the form of a fine powder of about 50 to 200 mesh.

The amount of the filler used is not particularly limited, but it is usually at least 0.5 part by weight, preferably 1 to 10 parts by weight, in the form of a water-containing filler, per 1 part by weight of the alkaline substance.

In the present invention, it is preferable that the alkaline substance and filler are mixed uniformly, but this is not essential.
It is also possible to add the filler separately, for example first, and then the alkaline substance into the packaging bag (pouch paper).

The carbon dioxide absorbent package in which the alkaline substance obtained according to the present invention is sealed together with a filler in a packaging material or drug packaging paper is as follows:
Shows good carbon dioxide absorption effect even in dry atmosphere. That is, in the case of the present invention, the water contained in the filler evaporates within the packaging body (medicine packaging paper) containing the absorbent, but in this case, the water vapor is isolated from the external dry atmosphere by the packaging material (medicine packaging paper). Therefore, even if some of the water vapor is diffused into the dry atmosphere outside through the packaging material (medicine packaging paper), there is still high humidity inside the packaging (medication packaging paper), which is suitable for the reaction between alkaline substances and carbon dioxide gas. Conditions are formed. This high humidity condition is then maintained until a significant amount of moisture contained in the filler is removed.

As a result, the carbon dioxide absorbent package according to the present invention exhibits an enhanced carbon dioxide absorbing effect compared to a package containing only an alkaline substance in a hermetically sealed package.

In the present invention, as the packaging material for sealing the alkaline substance and filler, any material such as paper, synthetic paper, plastic film, etc. can be applied as long as it is carbon dioxide permeable. In particular, it is advantageous to use materials whose moisture permeability is suppressed compared to paper. According to the research conducted by the present inventors, the moisture permeability is 500 VfrL.
"・24 hours or less, preferably loo 1.An"-2
4 hours or less, more preferably 10~s 0f7fn"
A range of -24 hours has proven advantageous. As the moisture permeability of the packaging material increases, the amount of water vapor that diffuses from the inside of the packaging material to the outside through the packaging material increases, making it difficult to maintain high humidity conditions inside the packaging material for a long period of time, resulting in product damage. The carbon dioxide absorption effect decreases accordingly. Therefore, if the material is permeable to carbon dioxide, it is preferable that its moisture permeability is as small as possible.

The water vapor permeability used in the present invention was measured as follows.

Envelope-shaped drug wrapping paper formed using packaging material (total surface area 20
Calcium chloride (dihydrate) 202 is put in a container (0 m ) and sealed tightly, and this is placed in a glass container (
The sample was placed on a plastic mesh provided in the space of a desiccator, and after being left at a temperature of 25° C., its weight was measured. Next, the increase in weight is taken as the moisture absorption amount, and 24 hours/1
The amount of moisture absorbed per m' was defined as moisture permeability.

The packaging material used in the present invention is preferably one that has low moisture permeability and carbon dioxide gas permeability as described above, but it is generally preferable to use the packaging material disclosed in Japanese Patent Publication No. 31257/1983. can.

Various modifications can be made to the carbon dioxide absorbent package of the present invention. For example, in addition to the carbon dioxide absorbent described above, a deodorizer, a desulfurizing agent, an oxygen absorber, etc. may be enclosed in the package. Can be done.

Next, the present invention will be explained in more detail with reference to Examples.

Example Pelletized soda lime (water content 10% by weight) 2.5 g powdered zeolite (water content 21% by weight) 2.5 f (or 5 g) was added to various bag-shaped packaging materials (medicine packaging paper). Various samples of carbon dioxide absorbent were obtained by sealing the container.

For comparison, a sample containing only soda lime 2f was prepared.

Next, each of these samples was roasted with roasted coffee beans (German roast). At the same time, the film was sealed in a KOP film (polypropylene film treated with polyvinylidene chloride) bag and left at room temperature for one month to conduct a carbon dioxide absorption test. On the other hand, in order to measure the amount of carbon dioxide gas generated from coffee beans, a coffee bean package without the carbon dioxide absorbent package enclosed was prepared in the same way, and the volume of the package was increased by leaving it at room temperature for one month. The volume increase was determined as the amount of carbon dioxide gas generated from coffee beans 2001.

The volume of the coffee bean package was measured by submerging the coffee bean package in water placed in a container and measuring the volume corresponding to the increase in water at that time.

The test results are shown in the table below. The samples of carbon dioxide absorbent packages shown in the table are as follows.

Sample A: Approximately 5,000 0.31111 pores/1 in polyethylene film (approximately 30μ thick)
For heat-sealing film perforated at a ratio of 0.0 crI, polyester film (thickness: approximately 30μ) was approximately 0.3 crI.
A packaging material (moisture permeability 10%/24 hours/m, hereinafter referred to as packaging material M) is formed by dry laminating a packaging film with 140 pores/1oo ml perforated through pure white paper. ) using soda lime 2? and zeolite 2.5 Ff in a sealed package.

Sample B: Soda lime 2z and zeolite 5fI- were sealed and packaged using packaging material M.

Sample C: Using a packaging material (water vapor permeable 2007%/24 hour vinyl, hereinafter referred to as packaging material N) whose paper surface has been treated to make it waterproof, Soda Lime 2? and Zeolai) 2.5
7 in a sealed package.

Sample D: Soda lime 21 and zeolite) 5ff were sealed and packaged using packaging material N.

Sample E...Using packaging material N, soda lime 2? sealed packaging.

Total carbon dioxide absorption = 570 - (Package volume after test - Package volume before test) Table 1 * Soda lime 1? As is clear from the results shown in the comparative example above, the carbon dioxide absorbent packages λ to D according to the present invention have a higher absorption amount than the conventional carbon dioxide absorbent package E. By comparing Samples A and B or Samples C and D, it was found that increasing the amount of water-containing filler (zeolite) that makes up the carbon dioxide absorbent It can be seen that the carbon dioxide absorption rate is improved. Furthermore, by comparing Samples A and 0 or Samples B and D, it can be seen that the carbon dioxide absorption rate improves as the packaging material (medicine wrapping paper) has a lower moisture permeability.

Patent applicant Daishibe Fujishima (and 1 other person) Agent Patent attorney Toshiaki Ikeura Procedural amendment (method) % formula % 1. Indication of the case 1982 Patent Application No. 711/≠Da 2 2 Title of the invention Carbon dioxide absorbent package 3, Address of the person making the correction: 1-22-15-5 Kamiosaki, Parts Ward, Tokyo
, Date of amendment order Vol. 6, Full text of the specification subject to amendment

Claims (1)

[Claims] (1) A carbon dioxide absorbent package characterized in that a carbon dioxide absorbent made of a filler containing an appropriate amount of water and an alkaline substance is hermetically packaged with a carbon dioxide permeable packaging material.