JP3091041U - Food packaging paper bag for rice etc. - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a food packaging paper bag made of rice or the like which has excellent moisture resistance and can be recycled as used paper. SOLUTION: The paper bag A for food packaging such as rice according to the present invention.
Is a paper bag having a double structure consisting of an outer bag 10 and an inner bag 20, wherein the inner bag 20 has a moisture-proof layer b containing a disintegrating polymer on its outer surface side, and the moisture-proof layer b The inner bag 20 was not exposed on the inner surface side.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

  The present invention is a food wrapping paper bag mainly for wrapping rice, wherein Food such as rice that has excellent moisture resistance and does not release air to the outside of the bag and is recyclable Regarding packaging paper bags.

[0002]

[Prior art]

  Traditionally, some paper bags have been used to wrap rice. In many cases, bags are made using a laminated sheet of synthetic resin and paper to compensate It is actually used.

[0003]

[Problems to be solved by the device]

  However, the laminated sheet of synthetic resin and paper is difficult to recycle as waste paper. It has the drawback of difficulty. On the other hand, conventional rice bags made of paper are The weight has decreased after a week or two, and buyers may complain about insufficient weight. There is also. The reason is that the traditional paper rice bag does not have moisture resistance, so the water content of the rice evaporates. And then there is the possibility that it will come out of the rice bag.

[0004]   Therefore, in view of the above problems, the inventor of the present invention has an excellent moisture-proof property and Has developed a recyclable rice and other food packaging paper bag.

[0005]

[Means for Solving the Problems]

  The food packaging paper bag of rice or the like according to the present invention is made of a paper with a double structure consisting of an outer bag and an inner bag. A bag, characterized in that the inner bag has a moisture-proof layer containing a disintegrating polymer To do.

[0006]   With this structure, a strong bag is constructed due to the double structure of the outer bag and the inner bag. Is made. Also, since the inner bag is coated with a moistureproof agent, the outer bag should not be damaged. Even if there is any, moisture resistance to the food in the inner bag is secured. Furthermore, the moisture-proof layer of the inner bag Is a disintegrating polymer, so the paper that makes up the bag is recycled as waste paper. It will be easy.

[0007]   Further, in the above-mentioned food packaging paper bag of rice or the like, the moisture-proof layer is exposed on the inner surface side of the inner bag. If not configured, the moisture barrier will come into direct contact with the food stored in the inner bag. Never.

Further, in the above-mentioned bag of food packaging paper such as rice, a resin composition containing an acrylic latex in a synthetic rubber-based latex and a granular filler in the synthetic rubber-based latex are used as a moisture-proofing agent for forming a moisture-proof layer. A resin composition containing the above or a resin composition containing a synthetic rubber latex containing an acrylic latex and a granular filler, and the glass transition temperature of the resin composition is in the range of 15 to 40 ° C. The amount is in the range of 5 to 50 g / m ^{2 in} terms of solid content, and when the acrylic latex is contained, the compounding ratio of the synthetic rubber latex and the acrylic latex is 50: 100 to 100: 50 by weight. Range, and when using a filler having a particle size of 3 to 30 μm in the case of containing a granular filler, it has excellent moisture resistance and is used as a paper sheet. Strength of Te, while maintaining the flexibility and extensibility, the production cost to be economical, water defibration properties and blocking well, is readily recyclable such as rice paper bag for food packaging as waste paper obtained.

[0009]   In the present invention, a paper bag having a double structure consisting of an outer bag and an inner bag means two paper sheets. The outer and inner bags are formed by stacking the When constructing a double-structured paper bag with a double structure, one cylinder forms two cylinders It consists of an outer bag and an inner bag by stacking a cylindrical body into the other cylindrical body to make a bag. When constructing a double-structured paper bag, form two bags with a single piece of paper When the other bag is stacked to form a double-structured paper bag consisting of an outer bag and an inner bag, There are throats, in short, the parts that make up the outer bag and the inner bag All double-structured paper bags with the part to be covered shall be included. Also, multiple outer bags When the inner bag is composed of a plurality of sheets of paper, it includes the case where the inner bag is composed of a plurality of sheets of paper.

[0010]

[Embodiment of device]

  Hereinafter, a bag for food packaging paper such as rice according to the present invention (hereinafter simply referred to as "bag body") Embodiments will be described with reference to the accompanying drawings.

[0011]   1 is a perspective view of the bag body, FIG. 2 is an exploded perspective view of the bag body, and FIG. 3 is an inner bag. FIG. 4 is a partially enlarged sectional view showing the layer structure of FIG. 4, and FIG. 4 shows the layer structure of another embodiment of the inner bag. It is a partially expanded sectional view.

[0012]   In FIG. 1 and FIG. 2, A is a bag body, which is composed of an outer bag 10 and an inner bag 20. To be done. In the vicinity of the upper opening of the bag body A, the fastening string 11 is attached to the outer bag 10 as shown in the figure. After it is attached horizontally, and after the items such as food are stored in the bag body A, By winding and fastening this fastening string 11 around the mouth of the bag body A, Is blocked. As shown in FIG. 2, the bag main body A has a tubular outer bag 10 in which The inner bags 20 having a tubular shape are stacked so as to be housed therein, and the lower ends 12, 22 of the both bags 10, 20 are stacked. Is folded back at the folding lines 13 and 23, and is folded down with respect to the folding end portion 14. The bottom portion of the bag body A is formed by adhering the adhesive strip 24 from one side. this Since the bag body A has a double structure of the outer bag 10 and the inner bag 20, The bag is constructed.

The outer bag 10 and the inner bag 20 are made of unbleached kraft paper having a basis weight of 75 g / m ² as a base material a of the paper constituting the outer bag 10 and the inner bag 20. The moisture-proof layer b is formed by applying a moisture-proof agent containing a polymer. FIG. 3 is a partially enlarged sectional view of the inner bag 20 showing the base material a and the moisture-proof layer b. The base material of the outer bag 10 and the inner bag 20 is not limited to unbleached kraft paper, and various paper materials can be used. However, in consideration of recyclability, those that are easily dispersed in water by mechanical disaggregation are preferable, for example, fine paper made from chemical pulp or mechanical pulp such as hardwood kraft pulp and softwood kraft pulp, medium-quality paper, Paper materials such as single-gloss kraft paper, Ryosara kraft paper, and stretch paper for crafting can be mentioned. The weighing amount is not limited to the above-mentioned amount, and can be appropriately selected within the range of 30 to 300 g / m ² according to the purpose.

[0014]   The moisture-proof layer b is coated with a styrene-butadiene polymer latex that is a moisture-proof agent. The moisture-proofing agent is formed by It's Mar. With this configuration, the moisture barrier agent is applied to the inner bag, so Even if the bag 10 is damaged or torn, it will be stored in the inner bag. The moisture-proof effect on foods is not impaired. Also, the moisture-proof layer b of the inner bag is disintegrated Since it is a polymer with excellent properties, the paper that makes up the bag is recycled as waste paper. It becomes easy to do. Furthermore, since the moisture-proof layer b is formed on the outer surface side of the inner bag 20, The moisture-proof layer b does not come into direct contact with the food stored in the inner bag.

As the moisture-proof agent for forming the moisture-proof layer b, a resin composition containing a synthetic rubber latex with an acrylic latex, a resin composition containing a synthetic rubber latex with a granular filler, or a synthetic rubber. It is composed of a resin composition containing an acrylic latex and a granular filler in a system latex, the glass transition temperature of the resin composition is in the range of 15 to 40 ° C., and the coating amount is 5 to 50 g in terms of solid content. / M ² , and when the acrylic latex is contained, the compounding ratio of the synthetic rubber latex and the acrylic latex is in the range of 50: 100 to 100: 50 by weight, and the granular filler is used. When it is contained, it is preferable to use a filler having a particle size in the range of 3 to 30 μm.

[0016]   That is, when the glass transition temperature of the resin composition is lower than the above range, the resin composition becomes soft. Therefore, the stretchability becomes high, and this high stretchability resists the shearing force that is received during disaggregation. Therefore, it is difficult to separate and decompose finely, and the disintegration property remarkably deteriorates. When it is cured, it becomes brittle and its extensibility is low, so the moisture resistance at the time of bending is reduced. .

[0017]   Further, if the coating amount of the resin composition is smaller than the above range, the moisture resistance is significantly reduced. However, even if it exceeds the above range, the moisture-proof property does not increase, which is not economical.

[0018]   Furthermore, in the above resin composition, the mixing ratio of the acrylic emulsion is the above. If it is less than the range, it softens and water disintegration and blocking become worse. If it exceeds, it is cured and the moisture resistance is lowered.

[0019]   Furthermore, when the particle size of the filler of the resin composition is smaller than the above range, the moisture resistance is high. Is less effective, and when it exceeds the above range, the surface of the moisture-proof layer b becomes uneven. , There is a risk of damaging the blade during shearing.

[0020]   Examples of the synthetic rubber-based latex include styrene butadiene latex and meta Crylate butadiene latex, acrylonitrile butadiene latex, etc. However, the water resistance is good, the elongation is good, and cracks due to breakage are less likely to occur. Tylene butadiene latex is preferred. Here, the polymerizable monomer is styrene and Mainly 1,3-butadiene, but other styrene and 1,3-butadien It is possible to use a monomer copolymerizable with benzene within a range that does not impair the purpose of the present invention. It Other monomers copolymerizable with styrene and 1,3-butadiene include: (A) α-methylstyrene, vinyltoluene, pt-butyltoluene, chloro Aromatic vinyl monomers such as styrene, (b) methyl (meth) acrylate, (meth ) Ethyl acrylate, propyl (meth) acrylate, n-a (meth) acrylate Mill, isoamyl (meth) acrylate, n-hexyl (meth) acrylate, (meth 2-ethylhexyl acrylate, n-octyl (meth) acrylate, (meth) ) 2-hydroxyethyl acrylate, hydroxypropyl (meth) acrylate Which (meth) acrylic acid ester monomer, (c) (meth) acrylonitrile, etc. Cyano group-containing ethylenically unsaturated monomer, (d) glycidyl acrylate, methac Glycidyl esters of ethylenically unsaturated acids such as glycidyl phosphite, (e) allyl Glycidyl ether of unsaturated alcohol such as glycidyl ether, (f) (meta ) Acrylamide, N-methylol (meth) acrylamide, N-methylol ( (Meth) acrylamide, N-butoxymethyl (meth) acrylamide and the like (meta) ) Acrylamide monomers, etc., and these polymerizable monomers alone or Two or more kinds can be mixed and used.

[0021]   Examples of the acrylic emulsion include styrene and styrene derivatives, Copolymerize acrylic acid (methacrylic acid), acrylic acid (methacrylic acid) ester, etc. Acrylic copolymer, acrylic-styrene copolymer, etc. be able to. Mix this acrylic emulsion with synthetic rubber latex By using it, the glass transition temperature can be easily controlled within the above target range. it can.

[0022]   The above-mentioned fillers include (a) calcium carbonate, talc, barium sulfate, and oxidation Inorganic fillers such as titanium and kaolin, (b) acrylic resin beads, styrene resin Among organic fillers such as beads, polyethylene resin beads and urethane resin beads One kind or a mixture of two or more kinds can be used, and as described above, the filler is blended. Thus, the moisture resistance can be improved.

[0023]   Next, a method for manufacturing the moisture-proof paper will be described. In addition, here is a synthetic rubber Moisture proof by dispersing granular filler in a mixture of Tex and acrylic emulsion A production example for producing the resin composition forming the layer b will be described. Rubber and acrylic emulsion, or synthetic rubber latex and granular It can also be applied to a combination with a filler.

[0024]   If necessary at the time of production, keep water-soluble resin such as starch or polyvinyl alcohol. Used as protective colloid, dispersant such as polycarboxylic acid, defoaming agent, surfactant A tint adjusting agent may be added. The resin composition thus prepared is used as the base material a. The moisture-proof layer b is formed by coating on the top and drying. Resin composition is sufficient for drying temperature It is sufficient to apply the amount of heat to form a film on it, so drying conditions equivalent to general coated paper are sufficient. . In addition, the surface of the substrate a opposite to the moisture-proof layer b is water-coated to prevent curling. Is preferred.

[0025]   As a facility for applying the resin composition as described above, an air knife coater is used. , Bar coater, roll coater, blade coater, gate roll coater, etc. Can be used. Especially blade coaters, bar coaters, air knives The coating method of scraping the coated surface of the coater, etc. makes the surface of the moisture-proof layer b smooth. It is preferred because it accelerates.

[0026]   In addition, as one of the methods for selecting a proper one from the above resin compositions, It is natural to conduct a product hygiene test and select one that conforms to this.

[0027]   The inner bag of the present invention is not limited to the above-mentioned embodiment, and is shown in FIG. As shown, the moisture-proof layer b is provided on the intermediate layer, and the paper base material a is arranged on the front and back sides thereof. It may be configured.

[0028]   [Test example]   Next, regarding the quality test of the bag body according to the present invention, which the present inventor requested a public organization, And explain. The test was carried out on the following 6 types of rice bags with rice sealed in a state of 5.00 kg. The sample is prepared in a state of temperature of 21 to 25 ° C and humidity of 45 to 55% RH of 50 ° C. Leave for 14 days in a constant temperature and humidity chamber, and the weight after 7 days and the weight after 14 days Was measured to measure the weight change of rice due to water evaporation.

[0029]   Sample 1: A laminated sheet of resin film and kraft paper was used for the inner bag, and the bottom was A rice bag filled with rice that has been closed by thinning and the mouth is closed.   Sample 2: Kraft paper with moisture barrier layer b is used for the inner bag and the bottom is hung on the sewing machine. More closed rice bag filled with rice and closed mouth   Sample 3: Rice using only kraft paper for the inner bag and closing the bottom with a sewing machine The bag is filled with rice and the mouth is closed   Sample 4: A laminated sheet of resin film and kraft paper was used for the inner bag, and the bottom was A rice bag filled with rice that has been closed by bundling and the mouth is closed   Sample 5: Kraft paper with moisture barrier layer b was used for the inner bag, and the bottom was taped. More closed rice bag filled with rice and closed mouth   Sample 6: Rice with only kraft paper used for the inner bag and the bottom of the bag closed with tape The bag is filled with rice and the mouth is closed   The measurement results are shown in the following table.

[0030]

[Table 1] From the above measurement results, in the case of the rice bags made of kraft paper only (Samples 3 and 6 above), the weight decreased by 2% or more after 14 days, and the rice bags laminated with the resin film (Samples 1 and 6 above). In the case of 4) and the rice bag having the moisture-proof layer b (Samples 2 and 5 above), the reduction rate of the weight was only 1/5 to 1/10 of that of the rice bag made only of kraft paper. It is proved that the moisture resistance of the rice bag formed with the moistureproof layer b is not inferior to that of the rice bag laminated with the resin film.

[0031]

[Effect of device]

  The food packaging paper bag of rice or the like according to the present invention is made of a paper with a double structure consisting of an outer bag and an inner bag. Is the bag an inner bag having a moisture-proof layer containing a disintegrating polymer? Since the double structure of the outer bag and the inner bag, a strong bag is constructed and the inner bag has a moisture-proofing agent. Since it is coated, even if the outer bag is damaged, The moisture-proof property of the inner bag is maintained and the moisture-proof layer of the inner bag is made of a degradable polymer. It becomes easy to recycle the paper constituting the paper as used paper.

[0032]   Also, in the above food packaging paper bags such as rice, the moisture-proof layer is exposed on the inner surface side of the inner bag. If not configured, the moistureproof agent will come into direct contact with the food stored in the inner bag. Since it does not occur, the anxiety caused by contact with the synthetic resin is eliminated.

Further, in the above food packaging paper bag of rice or the like, a resin composition containing an acrylic latex in a synthetic rubber latex or a granular filler in a synthetic rubber latex is used as a moistureproof agent for forming a moisture-proof layer. A resin composition containing the above or a resin composition containing a synthetic rubber latex containing an acrylic latex and a granular filler, and the glass transition temperature of the resin composition is in the range of 15 to 40 ° C. The amount is in the range of 5 to 50 g / m ^{2 in} terms of solid content, and when the acrylic latex is contained, the compounding ratio of the synthetic rubber latex and the acrylic latex is 50: 100 to 100: 50 by weight. Range, and when using a filler having a particle size of 3 to 30 μm in the case of containing a granular filler, it has excellent moisture resistance and is used as a paper sheet. Strength of Te, while maintaining the flexibility and extensibility, the production cost to be economical, water defibration properties and blocking well, is readily recyclable such as rice paper bag for food packaging as waste paper obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of a food packaging paper bag such as rice according to the present embodiment.

FIG. 2 is an exploded perspective view of a food packaging paper bag such as rice according to the present embodiment.

FIG. 3 is a partially enlarged cross-sectional view showing a layer structure of an inner bag of a food packaging paper bag such as rice according to the present embodiment.

FIG. 4 is a partially enlarged sectional view showing the layer structure of another embodiment of the inner bag.

[Explanation of symbols]

A: Bag body a ... Base material b ... Moisture-proof layer 10 ... Outer bag 11 ... Fastening string 12 ... Lower edge of outer bag 13 ... Folded line 14 ... Folded end 20 ... inner bag 22 ... Lower end of inner bag 23 ... Folded line 24 ... Adhesive strips

Claims (3)

[Scope of utility model registration request] 1. A double-structured paper bag comprising an outer bag and an inner bag, wherein the inner bag has a moisture-proof layer containing a disintegrating polymer, such as rice. Paper bag. 2. The food packaging paper bag for rice or the like according to claim 1, wherein the moisture-proof layer is not exposed to the inner surface side of the inner bag. 3. A moisture-proof agent for forming a moisture-proof layer is composed of a resin composition containing a synthetic rubber latex and an acrylic latex and / or a granular filler, and the resin composition has a glass transition temperature of 15 to 40. In the range of 5 ° C., the coating amount is in the range of 5 to 50 g / m ^{2 in} terms of solid content, and when an acrylic latex is contained, the compounding ratio of the synthetic rubber latex and the acrylic latex is a weight ratio. 50: 1
The range is from 0 to 100: 50, and when the granular filler is contained, the particle size of the filler is in the range from 3 to 30 μm, and the food packaging of rice or the like according to claim 1 or 2. Paper bag.