JP3075573B2 - Water-absorbent sheet-attached pouch and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pouch equipped with a water-absorbent sheet and a method for producing the same. The water-absorbent sheet-attached pouch to be manufactured according to the present invention is obtained by attaching a water-absorbent material to two superposed sheets to have a water-absorbing action, and attaching the sheet to the pouch material via the water-permeable sheet. It is used, for example, as a packaging material for fresh foods, packaging materials for fresh fish, meat, and the like, and is very useful as a pouch for maintaining freshness of fresh foods.

[0002] The above-mentioned water-absorbing material can be provided with functionality by including an antibacterial material or an odor-proof material.

[0003]

2. Description of the Related Art A water-absorbing sheet having a function is described below.
As described in JP-A-63-156540, an antibacterial water-absorbing sheet in which a highly water-absorbing resin and an antibacterial material are sprayed between two sheets is known. This water-absorbent sheet is used by being attached to a pouch material, but since the attachment of the water-absorbent sheet to the pouch material is usually performed manually, it is extremely inefficient and the improvement is not possible. Was sought.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present inventors
Intensive research has been conducted to develop a method for efficiently attaching the water-absorbent sheet to the pouch material, and a method for mechanically, continuously and hygienically attaching the water-absorbent sheet to the pouch material has been proposed. The invention has been completed.

[0005]

That is, the present invention provides a water-absorbing sheet containing a water-absorbing polymer inside, a water-permeable sheet stacked on one side of the water-absorbing sheet, and a water-absorbing sheet provided on the other side of the water-absorbing sheet. A laminated sheet comprising a first pouched raw material and a second pouched raw material provided on one surface side of the water-permeable sheet, wherein the water-permeable sheet and the two pouched raw materials have both side ends and a lower end. Are formed in a bag shape having an upper end opened by sealing so as to be integrated, wherein the water-absorbent sheet is located in the bag shape between the one pouch material and the water-permeable sheet. It is a bag-shaped pouch fitted with a water-absorbent sheet.

Further, according to the present invention, the water-absorbent sheet 4 containing a water-absorbent polymer therein is sequentially intermittently fed out, and the first pouch raw material 8 wider than the water-absorbent sheet 4 from the lower part of the water-absorbent sheet flow. Are continuously supplied such that the center line in the width direction of the water-absorbent sheet 4 and the center line in the width direction of the pouch blank 8 are shifted from each other. , And continuously supplies a second pouch raw material 9 having substantially the same width as the pouch raw material 8 on the water permeable sheet 7 from above. , Whereby the water-absorbent sheet 4 is intermittently sandwiched between the water-permeable sheet 7 and the two pouch fabrics 8 and 9, and only one edge in the width direction of the pouch fabric laminate flow is provided. The above water-permeable sheet 7 and two pouch fabrics , 9 are integrated so that the two pouch fabrics 8 and 9 are sealed at a defective portion of the water-absorbent sheet 4 in a direction perpendicular to the flow direction, and then the pouch fabric laminate 6 is sealed. A method for manufacturing a water-absorbent sheet-attached pouch, which comprises cutting a seal portion.

Hereinafter, the present invention will be described in detail. The water-absorbing sheet used in the present invention and containing a water-absorbing polymer therein may be made by any method. For example, the method disclosed in JP-A-2-252560 (see FIG. 2).

That is, the water absorbent resin 13
Powder 16 consisting of a functional powder 14 and a binder 15
Spraying. A step of, after spraying the mixed powder 16, laminating the base material 2 and passing through the space between the heating rolls 100 to integrate them. A step of cutting the laminate 3 prepared in the above to an arbitrary size to form the water-absorbent sheet 4. Steps of intermittently sending out the water-absorbent sheets 4 prepared in the above so as to have a certain interval 5 yield fragments of the water-absorbent sheets 4.

A specific example of the pouch equipped with a water-absorbent sheet of the present invention will be described with reference to FIGS. Between the base material 1 and the base material 2, the water-absorbent resin 13, the functional powder 14, and the binder 1
The water-absorbent sheet 4 is formed, including the mixed powder 16 composed of the water-absorbent sheet 4. The upper surface of the water-absorbent sheet 4 is covered with a water-permeable sheet 7, and the laminated sheet is wrapped by a pouch fabric 9 and the both ends in the width direction of the water-permeable sheet and two pouch fabrics are integrated. In the vertical direction, the upper end is opened and the lower end is sealed to form a bag. The water-absorbent sheet 4 is located in a bag between the raw pouch 8 and the water-permeable sheet 7, and the bag between the water-permeable sheet 7 and the raw pouch 9 has a storage space for fresh food. Has become. In FIG. 1, the left side is the upward direction, and the pouch mounted with a water-absorbent sheet inserts and packages fresh food from the opening at the upper end.

At least one of the base material 1 and the base material 2 is made of a material having water permeability, such as paper, nonwoven fabric, porous sheet such as porous polyethylene sheet or porous polypropylene sheet, cellophane, vinylon film, or paper or nonwoven fabric. Laminates, sized paper or nonwoven fabric with cellulose film formed by viscose, cellulose film with fine pores formed, thermoplastic film foamed to have fine communication holes during film production Any material may be used as long as it has a certain degree of water permeability, such as one formed by adding an inorganic substance or a nucleating agent having a high melting point and stretching to form fine communication holes, a mixed paper of polyethylene or polypropylene and pulp, or The thickness and basis weight may be any as long as they have a certain degree of water resistance and strength. The other is not particularly limited.

As the water-permeable sheet 7, for example,
Part or all of the nonwoven fabric made of thermoplastic resin, that is, rayon, fibers such as pulp impregnated or mixed with thermoplastic resin such as polyolefin, polyester, polyamide, or polyolefin, polyester,
A nonwoven fabric made of a fiber such as polyamide, a perforated film made of a thermoplastic resin, a material obtained by applying a pressure-sensitive or heat-sensitive adhesive to paper, or the like can be used.

The two pouch fabrics 8 and 9 may be any films made of a thermoplastic resin having heat sealing properties, such as LDPE (low density polyethylene) and MDPE.
(Medium density polyethylene), HDPE (high density polyethylene), LLDPE (linear low density polyethylene), EVA (ethylene / vinyl acetate copolymer), CPP (unstretched polypropylene), etc. A multilayer film or the like used as the innermost layer (heat seal) can be used. In particular, it is desirable to use a multilayer film having an oxygen barrier property that is excellent in maintaining the quality of the contents. ) / CPP, KPET (vinylidene chloride-coated stretched polyester) / LDPE. Also,
Multilayer film using aluminum foil, eg ON / AL foil / ON
/ CPP also has a light-shielding property and a gas-blocking property, and can be used similarly.

Examples of the water absorbing resin include starch / acrylate graft polymer, carboxymethyl cellulose crosslinked product, vinyl alcohol / acrylate copolymer, polyacrylonitrile hydrolyzate, crosslinked polyacrylate,
Modified polyvinyl alcohol, acrylate polymer, acrylate / acrylamide copolymer or isobutylene
Maleic anhydride copolymers and the like can be mentioned, and it is of course possible to use two or more of the above.

Examples of the functional powder include an antibacterial agent, a deodorant, and an ethylene adsorbent. As an example of the antibacterial agent, a carrier carrying a nonvolatile antibacterial substance can be mentioned. As the carrier, zeolite and activated carbon can be used. Non-volatile antibacterial substances include silver,
Copper, zinc and the like can be mentioned.

As the deodorizing agent, a physical adsorption deodorizing agent, a chemical deodorizing agent, a physical / chemical deodorizing agent and the like can be used, but the deodorizing agent is not particularly limited as long as it can deodorize a bad odor. Physically adsorbed deodorant Neutral activated carbon, zeolite, activated alumina, acid clay, etc.Chemical deodorant Acidic, alkaline, oxidizing, reducing agents, etc.Physical / chemical deodorant Alkaline or acidic impregnated activated carbon, zeolite adsorbing vegetable oil, etc. Other desulfurizing salts such as iron phthalocyanine derivatives and zinc oxide,
Mixtures of iron (II) compounds with L-ascorbic acid and alum.

As the ethylene gas adsorbent, a carbon molecular sieve adsorbing bromine, preferably one having a micropore of 4 to 6 °, or an acidic water in which sodium bromide or potassium bromate is dissolved is added to activated carbon and reacted. After
Dried and pulverized particles having a particle size of 0.01 to 100 μm are exemplified. Activated carbon, zeolite, Oyaishi and the like, which are generally used as ethylene gas adsorbents, are not preferable because they release the adsorbed ethylene gas when there is moisture.

By laminating a new base material on the base material 1 or the base material 2, it is possible to give a texture to the water-absorbent sheet or to impart waterproofness. By superimposing a new base material on the whole, it is possible to give a high-grade feeling to the whole and to impart waterproofness. Furthermore, base material a / mixed powder A / base material b / mixed powder B
By forming the water-absorbing sheet into a multilayer structure, such as / substrate c / mixed powder C / substrate d, it is also possible to integrate substances that cause inconvenience when mixed into one sheet.

An example of a manufacturing apparatus for a pouch equipped with a water-absorbent sheet according to the present invention will be described below with reference to FIG.
A first transport mechanism 31 for transporting the long base material 1 at a first speed, a spray mechanism 40 for uniformly spraying the mixed powder 16 containing the water-absorbent resin on the base material 1, From the upper part, the first material is supplied so as to overlap the substrate 1 at the first speed.
Supply mechanism (roll 22), a heating roll 100 for sandwiching and integrating the mixed powder between the base materials 1 and 2, a first cutter 50 for cutting the stacked laminate 3 to a predetermined length, A second transport mechanism 32 for transporting the water-absorbent sheet 4 at a second speed higher than the above speed, and a pouch raw material 8 wider than the base materials 1 and 2 are continuously fed from a lower portion of the second transport mechanism. A second supply mechanism (roll 23) for supplying, a third supply mechanism (roll 24) for continuously supplying the water-permeable sheet 7 having a width slightly smaller than the upper part of the second transport mechanism, the second supply mechanism A fourth supply mechanism (roll 25) for supplying the pouch raw material 9 having the same width as the pouch raw material 8 so as to overlap the water-permeable sheet 7 from the upper part of the transport mechanism; Side seal roll that heat seals only the edge at one end in the width direction 0, an end seal roll 80 for sealing the two pouch webs 8 and 9 in a direction perpendicular to the flow direction at a defective portion of the fragment of the water-absorbent sheet 4 in the flow of the pouch web laminate; This is an apparatus for manufacturing a water-absorbent sheet-attached pouch, comprising a cutter 50 'for cutting a sealed portion of a flow.

[0019]

An embodiment of the present invention will be described below with reference to the accompanying drawings. In FIG. 2, the substrate 1 (crepe paper 20 g / m ² ) wound on the roll 21 is horizontally moved by the cutter 50 by a first transport mechanism 31 including a first transport belt (not shown). It is transported to the position. During this transportation, the mixed powder 16 is sprayed on the base material 1 from the spraying mechanism 40 of the mixed powder 16. On the base material 1 on which the mixed powder 16 has been sprayed, the base material 2 (crepe paper 20 g / m ² ) overlaps the base material 1 in the same direction at the same speed as the first transport speed from above. It is supplied in such a manner that it is fed and integrated by the heating roll 100, and is conveyed on the first conveyance belt in the state of the laminate 3.

A rotary cutter 50 is provided downstream of the first transport mechanism 31. The rotation of the rotary cutter 50 is synchronized with the transport of the laminate 3 and cuts the laminate 3 into a certain length. The number of blades of the cutter 50 can be set to an appropriate number, such as two, four, or the like, depending on dimensions such as a rotation diameter. After being cut by the cutter 50, the laminate 3 is gripped by the second transport mechanism 32 as the water-absorbent sheet 4. Second transport mechanism 3
2 is driven at a slightly higher speed than the first transport mechanism 31, the laminate 3 is cut by the cutter 50, the gap is opened at the cut portion, and the laminate 3 has a constant gap 5 between its end faces. While being transported. The water-absorbent sheet 4 obtained thereafter is conveyed by a second conveyance mechanism (not shown) after the second conveyance mechanism 32.

In this transport path, a lower pouch raw material 8 (ON / PE film) wider than the water-absorbent sheet 4 from the lower part of the water-absorbent sheet 4 advances so that the center lines in the width direction of the two sheets are shifted from each other. Supplied in the direction. (See upper view of FIG. 3 and FIG. 4). Then
A water permeable sheet (nonwoven fabric: E-1 manufactured by Fukumura Paper Co., Ltd.) having a width slightly narrower than the pouch material from the top of the water absorbent sheet 4
8) 7 is supplied, and thereafter, a pouch raw material (ON / PE film) 9 having the same width as the pouch raw material 8 is supplied from the upper portion thereof so as to be overlapped, thereby forming a laminated body 6 (FIG. 3 and FIG. 5). The laminate 6 has a water-permeable sheet 7 and two pouch fabrics 8 only at one edge thereof,
9 with the side seal roll 70 so that
Sealed at 0 ° C. Next, the upper and lower pouch webs 8, 9
The water-absorbent sheet 4 is fed to the end seal 8 in a state where it is sandwiched at a predetermined interval 5, and at a portion where the water-absorbent sheet 4 is deficient, about 150 mm in a direction perpendicular to the flow direction of the raw pouch fabric.
End sealed at ° C. The laminate stream is then cut by the cutter 50 'at this end seal. As a result, the bag (pouch size: 460 × 56) shown in FIG.
0 mm, water-absorbent sheet size: 300 x 510 mm, nonwoven fabric size: 430 x 560 mm) A pouch equipped with a water-absorbent sheet was obtained.

[0022]

According to the present invention, by supplying a plurality of base materials to a linear conveyance path and providing various processing steps at the same time, a continuous continuation of a fully-automated water-absorbing sheet-attached pouch which does not require a manual operation. Production has become possible.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of a water-absorbent sheet-attached pouch of the present invention, and a plan view showing a partially folded state.

FIG. 2 is a view showing an example of a whole process diagram for manufacturing a pouch equipped with a water absorbing sheet.

FIG. 3 is a diagram showing a state in which a water-absorbent sheet is covered in the production of a pouch with a water-absorbent sheet.

FIG. 4 is a sectional view taken along line IV-IV in FIG. 3;

FIG. 5 is a sectional view taken along line VV in FIG. 3;

[Explanation of symbols]

1, 2, base material, 3 laminate, 4 water-absorbent sheet, 5 regular intervals, 6 laminate, 7 permeable sheet, 8, 9 pouch fabric, 22, 23, 24, 25 ... first, second, third, fourth
Supply mechanism, 31 ... first transport mechanism, 32 ... second transport mechanism, 40 ... mixed powder dispersing mechanism, 50, 50 '... cutter, 70 ... side seal roll, 80 ... end seal roll, 100 ... heating roll.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Satomi Yamagishi 1-1-1, Ichigaya-Kaga-cho, Shinjuku-ku, Tokyo Inside Dai Nippon Printing Co., Ltd. (72) Inventor Shigeji Inaoka 1137 Hara, Numazu-shi, Shizuoka (56) References JP-A-4-265740 (JP, A) JP-A-1-36438 (JP, A) JP-A 1-222430 (JP, U) JP-A 62-11767 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) B32B 1/00-35/00 B65D 81/00-81/38

Claims (2)

(57) [Claims] 1. A water-absorbing sheet containing a water- absorbing polymer inside , a water-permeable sheet stacked on one side of the water-absorbing sheet,
A first pouch fabric provided on the other surface side of the water absorbent sheet,
And a second pouch original provided on one side of the water-permeable sheet
A laminated sheet consisting of anti, the water permeable sheet and two pouch raw has both side ends and
A bag-like shape that seals to integrate the lower end and opens at the upper end
And the water-absorbent sheet is the same as the second pouch material.
It is located in the bag between the water-permeable sheets.
A pouch fitted with a bag-shaped water-absorbent sheet. 2. A water-absorbing sheet containing a water- absorbing polymer inside.
Preparative 4 sequentially intermittently feeding the said water-absorbing wider than the absorbent sheet 4 from the lower portion of the seat flow first pouch raw 8 in the width direction center line of the absorbent sheet 4 and the pouch raw
8 are continuously supplied so as to overlap each other at such a position that the center lines in the width direction are shifted from each other, and then the water-permeable sheet 7 having a width slightly smaller than the pouch raw material 8 is continuously supplied from the upper portion thereof. From the upper part, the same width as the pouch fabric 8
The second pouch raw 9 continuously fed to superimposable on the water permeable sheet 7, thereby intermittently the permeable sheet 7 and two pouch raw said absorbent sheet 4
Was pinched with 8,9, only one end edge portion in the width direction of the pouch raw fabric laminate flow the water permeable sheet 7 and two pouch raw
After sealing such that the sheets 8 and 9 are integrated, the two sheets of the pouch blanks 8 and 9 are sealed at a defective portion of the water absorbent sheet 4 in a direction perpendicular to the flow direction, and then the pouch is sealed. Raw laminate 6
Cutting the sealing portion of the above.