JPH04265740A - Water-absorbing sheet mounted pouch and manufacture thereof - Google Patents

Abstract

PURPOSE:To obtain a water-absorbing sheet mounted pouch by joining the upper end section of a water-permeable sheet with a pouch raw fabric in a lower section and joining both side ends and lower end of a laminate so that the water-permeable sheet and upper and lower pouch raw fabrics are unified. CONSTITUTION:A polymer sheet 4, the inside of which contains a water-absorbing polymer, is delivered intermittently, and a lower pouch raw fabric 8 having specified width is superposed at a position, where the cross center line of the sheet 4 and the cross center line of the pouch raw fabric 8 are displaced mutually, from the lower section of said sheet flow. A sheet 4 absence section in the upper surface of the pouch raw fabric 8 is supplied with adhesive in parallel with the side section of the pouch raw fabric, a water permeable sheet 7 having specified width is fed, and an upper pouch raw fabric 9 having specified width is supplied from an upper section, thus preparing a laminate 6. Only a side section on the reverse side to the side section coated with adhesives of the laminate 6 is sealed by the water-permeable sheet 7 and the pouch raw fabrics 8, 9, and the pouch raw fabrics 8, 9 are sealed in the rectangular direction in the flow direction by the sheet 4 absence section. A sealing section in the rectangular direction of the laminate 6 is cut.

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-absorbing sheet and a method for manufacturing the pouch. The pouch equipped with a water-absorbent sheet, which is the object of manufacture of the present invention, is made by adding a water-absorbing sheet to the pouch material through a water-permeable sheet, which has a water-absorbing effect by impregnating a water-absorbing material into two superimposed sheets. It is used as a packaging material for fresh foods, fresh fish, meat, etc., and is very useful as a pouch for preserving the freshness of fresh foods. The above-mentioned water-absorbing material can be given functionality by containing an antibacterial material or a deodorizing material.

0002

[Prior Art] Regarding functional water absorbing sheets,
As described in JP-A-63-156540, an antibacterial water-absorbing sheet is known in which a super absorbent resin and an antibacterial material are sprinkled between two sheets. When this water-absorbing sheet is attached to a pouch material and used, it can effectively absorb water released from the material to be packaged, making it possible to obtain an extremely useful pouch material.

0003

[Problem to be solved by the invention] However, conventionally,
Attaching the water absorbent sheet to the pouch material is usually done manually, which is extremely inefficient, and there has been a demand for improvement. Further, there is an inconvenience that the water absorbent sheet escapes from inside the pouch to the outside during handling of the pouch.

[0004] Therefore, the present inventors conducted intensive research in order to develop a method for efficiently attaching the pouch and to obtain a pouch in which the water-absorbing sheet is stably attached. They devised a method for mechanically, continuously, and hygienically attaching the material to the pouch material, and completed the present invention.

[0005]

[Means for Solving the Problems] That is, the present invention provides a polymer sheet containing a water-absorbing polymer therein, a water-permeable sheet superimposed on the upper surface of the polymer sheet, and a laminated sheet comprising the polymer sheet and the water-permeable sheet. A laminate consisting of upper and lower original pouch fabrics stacked on both outer surfaces, the upper end of the water-permeable sheet being joined to the lower pouch fabric, and both side ends and lower ends of the laminate being joined to the water-permeable sheet. and discloses a bag-shaped water-absorbing sheet attached pouch formed by joining upper and lower pouch original fabrics so as to be integrated,
provide.

Furthermore, the present invention includes a step of sequentially and intermittently feeding out a polymer sheet containing a water-absorbing polymer therein, and a lower raw pouch having a width wider than the polymer sheet from the lower part of the polymer sheet stream in the width direction of the polymer sheet. A step of continuously feeding the raw pouch so that the center line and the center line in the width direction of the raw pouch overlap each other at a position that is shifted from each other, and supplying the raw pouch to the upper surface of the raw pouch where the polymer sheet is not located. A step of continuously supplying an appropriate adhesive approximately parallel to the side part, and a width from the side part opposite to the side part to which the adhesive is applied to at least the part to which the adhesive is applied. and a step of further continuously supplying an upper pouch raw material having a width approximately the same as the lower pouch raw material from the upper part. A laminate is created in which a water-permeable sheet and both original pouches are sandwiched intermittently, and only the side of the laminate opposite to the side to which the adhesive is applied is made water-permeable. a step of sealing the sheet and both original pouches so that they are integrated; a step of sealing both original pouches in a direction perpendicular to the flow direction in a region where the polymer sheet is absent; and a sealed portion of the laminate in the perpendicular direction. A method for manufacturing a water-absorbent sheet-attached pouch is also disclosed and provided.

The present invention will be explained in detail below. The polymer sheet containing a water-absorbing polymer therein used in the present invention may be made by any method, but for example, it may be made by the method disclosed in JP-A-2-25250. Preparation is a preferred embodiment. That is, it consists of the following steps. ■ Sprinkling mixed powder 16 consisting of water-absorbing resin 13, functional powder 14 and binder 15 onto base material 1;
■ After spreading the mixed powder 16, the base materials 2 are stacked and passed between heating rolls 100 to integrate them by sandwiching them, ■
A step of cutting the laminate 3 created in ■ to ■ to an arbitrary size to create a polymer sheet 4, and
A polymer sheet is obtained by a step of sequentially and intermittently feeding out the polymer sheets 4 prepared in steps 1 to 3 at a constant interval 5. Note that the numbers attached to each member are those shown in the attached FIGS. 1, 2, and 3 for convenience.

In the present invention, at least one of the base material 1 and the base material 2 is made of a material having water permeability, such as paper, a nonwoven fabric, a porous sheet such as a porous polyethylene sheet, a porous polypropylene sheet, cellophane, a vinylon film, or a material thereof. Bonded products with paper or non-woven fabric, sized paper or non-woven fabric with cellulose membrane formed using viscose, cellulose membrane with fine pores formed, thermoplastic film foamed to have fine continuous pores during film production. Any material as long as it has a certain degree of water permeability, such as processed materials, materials that have been stretched with the addition of inorganic substances or high-melting point nucleating agents to form microscopic pores, and paper made from a mixture of polyethylene, polypropylene, and pulp. Also, the thickness and basis weight may be any as long as they have a certain degree of water resistance and strength. There are no particular limitations on the other.

[0009] Water-permeable sheets include, for example, non-woven fabrics partially or entirely made of thermoplastic resin, ie, fibers such as rayon and pulp impregnated with or mixed with thermoplastic resins such as polyolefin, polyester, and polyamide; Nonwoven fabrics made of fibers such as polyolefin, polyester, and polyamide, perforated films made of thermoplastic resin, and paper coated with pressure-sensitive or heat-sensitive adhesives can be used.

[0010] The upper and lower pouch materials 8 and 9 may be any film made of thermoplastic resin having heat-sealing properties, such as LDPE (low density polyethylene),
MDPE (medium density polyethylene), HDPE (high density polyethylene), LLDPE (linear low density polyethylene), EVA (ethylene/vinyl acetate copolymer),
Single-layer films such as CPP (unoriented polypropylene),
A multilayer film or the like having these as a sealant layer (heat-sealed as the innermost layer) can be used. In particular, it is desirable to use multilayer films with oxygen barrier properties that maintain the quality of the contents; examples include ON (stretched nylon)/LLDPE, KON (vinylidene chloride coated stretched nylon)/LLDPE, and KOP (vinylidene chloride coated stretched polypropylene). )/CPP, KPET (vinylidene chloride coated stretched polyester)/LDPE, and the like. In addition, multilayer films using aluminum foil,
For example, ON/AL foil/ON/CPP etc. have light blocking properties and gas blocking properties and can be used in the same manner.

[0011] Examples of the water-absorbing resin include starch/acrylate graft polymers, carboxymethylcellulose crosslinked products, vinyl alcohol/acrylate copolymers, polyacrylonitrile hydrolysates, crosslinked polyacrylates,
Modified polyvinyl alcohol, acrylate polymer, acrylate/acrylamide copolymer or isobutylene/
Examples include maleic anhydride copolymers, and it is of course possible to use two or more of the above.

[0012] Examples of the functional powder include antibacterial agents, deodorizing agents, and ethylene adsorbents. Examples of antibacterial agents include carriers carrying nonvolatile antibacterial substances. ■ Zeolite and activated carbon can be used as carriers. ■ Examples of nonvolatile antibacterial substances include silver, copper, and zinc.

[0013] As the deodorizing agent, physical adsorption deodorizing agents, chemical deodorizing agents, physical/chemical deodorizing agents, etc. can be used, but there is no limitation at all as long as it deodorizes bad odors. ■Physical adsorption deodorizers such as neutral activated carbon, zeolite, activated alumina, acid clay, etc.■
Chemical deodorizers Acidic agents, alkaline agents, oxidizing agents, reducing agents, etc. Physical/chemical deodorizers Alkaline or acidic impregnated activated carbon, zeolite adsorbed with vegetable oil, etc. ■ Other desulfurizing salts such as iron phthalocyanate derivatives and zinc oxide ,
Mixtures of iron (II) compounds, L-ascorbic acid and alum, etc.

The ethylene gas adsorbent is a carbon molecular sieve adsorbed with bromine, preferably one having micropores of 4 to 6 Å, or activated carbon is reacted with acidic water in which sodium bromate or potassium bromate is dissolved. After
Examples include dried and pulverized particles with a particle size of 0.01 to 100μ. Activated carbon, zeolite, Oya stone, etc., which are generally used as ethylene gas adsorbents, are not preferable because they release adsorbed ethylene gas in the presence of moisture.

[0015] By overlaying a new base material on the base material 1 or 2, it is possible to give the polymer sheet a texture or waterproof property. By layering a new base material, it is possible to give the entire product a luxurious feel. Furthermore, the base material a/
Mixed powder A/base material b/mixed powder B/base material c/mixed powder C
By forming the polymer sheet into a multilayer structure as in /Base material d, it is also possible to integrate substances that would cause problems when mixed into one sheet.

[0016] Also, the adhesive used in "the step of supplying an appropriate adhesive 10 to the upper surface of the pouch material 8, where the polymer sheet 4 is not located, approximately parallel to the side portions of the pouch material material" Any agent may be used as long as it does not adversely affect the packaged item, but it is preferable to use a wax hot-melt adhesive that obtains adhesive strength by heating and melting the adhesive and solidifying it by cooling. . As wax for wax hot melt adhesives, paraffin wax, Fischer-Tropsch wax, various low molecular weight polyethylene waxes, and polypropylene waxes can be used. Known materials containing additives, antioxidants, ethylene vinyl acetate copolymer (EVA), etc. can be used.

[0017]

[Operation] The pouch manufacturing method according to the present invention makes it possible to mechanically, continuously and hygienically attach the water absorbent sheet to the pouch material. In addition, the pouch with a water-absorbent sheet according to the present invention has a lower pouch raw material, a water-absorbing polymer sheet, a water permeable sheet, and an upper pouch raw material laminated in layers, and the lower pouch raw material is laminated at both ends and the lower end. , the water-permeable sheet, and the upper pouch material are sealed together, and at the upper end, only the lower pouch material and the water-permeable sheet are sealed together.

[0018] Therefore, at the upper end of the pouch, an opening is formed between the water-permeable sheet and the upper pouch material for inserting a packaging material for fresh foods, etc., and the water-absorbing sheet is inserted into the lower pouch material. It will be enclosed within a sealed space formed by the fabric and the water-permeable sheet. This prevents the water-absorbent sheet from accidentally jumping out from inside the pouch while the pouch is being handled, and also prevents packaging of fresh foods, etc. Insertion of material is prevented.

[0019]

EXAMPLES Hereinafter, the water-absorbent sheet-attached pouch according to the present invention and its manufacturing method will be explained in more detail based on examples. FIG. 1 is a plan view of an embodiment of a pouch equipped with a water absorbent sheet according to the present invention, and FIG. 2 is a sectional view thereof. As shown in the figure, this pouch consists of a lower pouch original fabric 8
The above-mentioned conventionally known water absorbent sheet 4 is placed on top of the water-absorbing sheet 4, and the water-permeable sheet 7 is laminated above the water-permeable sheet 7, and the upper pouch material 9 is laminated thereon. The upper and lower pouch original fabrics and the water-permeable sheet are integrally heat-sealed, and at the upper end, only the lower pouch original fabric 8 and the upper side of the water-permeable sheet 7 are joined by hot melt resin.

Next, an example of an apparatus used in the method of manufacturing a water absorbent sheet according to the present invention will be explained with reference to FIG. This device consists of the following mechanism. That is, the first transport mechanism 3 transports the elongated base material 1 at a first speed.
1. Mixed powder 1 containing water-absorbing resin uniformly on the base material 1
6, a first supply mechanism 22 that supplies the base material 2 from above the base material 1 at the first speed so as to overlap the base material 1, and a first supply mechanism 22 that supplies the mixed powder between the base materials 1 and 2. a heated embossing roll 100 that is sandwiched and integrated with the laminate 3, a first cutter 50 that cuts the stacked laminate 3 into a predetermined length, and a second cutter 50 that transports the cut polymer sheet 4 at a second speed higher than the above speed. 2 transport mechanism 32, the second supply mechanism 23
On the downstream side of the cut polymer sheet 4, a second supply mechanism 23 continuously supplies a lower pouch material 8 wider than the cut polymer sheet 4 from below with their widthwise center lines offset from each other; An application device 60 for continuously applying adhesive 10 to the upper surface of 8 where the polymer sheet is not located, located downstream of the second conveyance mechanism and having a wider width than the polymer sheet 4; Also, a water-permeable sheet 7 having a width slightly narrower than the lower pouch original fabric 8 is placed from above with one end of the sheet 7 almost coinciding with one side edge of the lower pouch original fabric 8 on the side where the adhesive 10 is not located. A third supply mechanism 24 that continuously supplies the adhesive, a pressure roll 80' for adhering the adhesive application portion 10, which is located downstream of the third supply mechanism and is the same as the lower pouch original fabric 8. A fourth supply mechanism 25 feeds the upper pouch material 9 of the width so as to overlap the water-permeable sheet 7, and the side edges of the resulting laminate 6 consisting of the pouch material and the water-permeable sheet are aligned. Side seal roll 7 that heat-seals only the edge of one side of the side
0. An end seal roll 80 that seals both pouch materials in a direction perpendicular to the flow direction at a portion of the pouch material laminate flow where the polymer sheet 4 is absent, and cutting the sealed portion of the pouch material material laminate flow. This is an apparatus for manufacturing a water-absorbent sheet-attached pouch, which includes a second cutter 50' for cutting.

Next, one embodiment of manufacturing a pouch equipped with a water absorbent sheet according to the present invention using this apparatus will be explained. The base material 1 (for example, crepe paper 20 g/m2) wound around the roll 21 is transported horizontally to the position of the first cutter 50 by a first transport mechanism 31 including a first transport belt and the like. During this conveyance, the above-mentioned mixed powder 16 is sprinkled onto the base material 1 from the scattering mechanism 40. On the base material 1 on which the mixed powder 16 has been sprinkled, the base material 2 is supplied from above at the same speed as the above-mentioned first conveyance speed so as to overlap in the same direction as the base material 1, and is heated. The embossing rolls 100 are used to sandwich and integrate the first layer in the form of a laminate.
It is transported on the transport mechanism 31 of.

The rotation of the rotary cutter 50 located downstream of the first conveyance mechanism 31 is synchronized with the conveyance of the laminate 3, and cuts the laminate to a constant length. The cutter 50 can be provided with an appropriate number of blades, such as two or four, depending on the dimensions such as the rotation diameter. After the laminate 3 is cut by the cutter 50, it is held as a polymer sheet 4 by the second conveyance mechanism 32. Since the second conveyance mechanism 32 is driven at a slightly higher speed than the first conveyance mechanism 31, after the laminate 3 is cut by the cutter 50, a gap is opened at the cut portion, and a certain distance is formed between the end faces. It will be conveyed with an interval of 5. Thereafter, the obtained polymer sheet 4 is transported by a third transport mechanism (not shown) after the second transport mechanism 32 .

[0023] In this conveyance path, the polymer sheet 4
From the bottom of the polymer sheet 4, a lower pouch material (for example, ON/PE film) 8, which is wider than the polymer sheet 4, is continuously overlapped in the direction of travel with the center lines of both in the width direction being offset from each other. Supplied. (See the upper part of Figure 4). Next, the polymer sheet 4 is removed from the top of the polymer sheet 4.
A water-permeable sheet with a width slightly narrower than the original pouch fabric (for example, nonwoven fabric: E manufactured by Fukumura Paper Industries Co., Ltd.)
-18) 7 is continuously supplied in a state in which one end in the width direction thereof substantially coincides with one end in the width direction of the lower pouch raw fabric 8.

On the other hand, in the supply route of the lower pouch raw fabric 8,
A coating device 60 is located for continuously coating the adhesive 10 on the upper surface of the lower pouch original fabric 8 at a portion where the polymer sheet is not located, and is configured to apply an adhesive such as hot melt resin. It is continuously applied onto the upper surface of the lower pouch original fabric 8 (see FIG. 5). After that, the lower pouch original fabric 8
The laminated flow of the water-permeable sheet 7 and the like passes through a pressure roller 80', where the hot-melt agent 10 applied by the coating device 60 is pressed against the lower pouch original fabric 8 and one end side edge of the water-permeable sheet 7. parts are joined.

Next, further downstream, an upper pouch raw fabric having the same width as the lower pouch raw fabric 8 (for example,
The laminate 6 is formed by supplying the ON/PE films 9 in a superimposed manner. Next, the side seal roll 70 heat-seals only the edge of one widthwise end on the side where the side ends of each member of the laminate 6 coincide. Thereby, the laminate 6 is sealed such that the water-permeable sheet and the two original pouches are integrated only at one edge (see the lower diagram in FIG. 4 and FIG. 6).

Next, this laminate 6 is sent to an end seal roll 80, and the portion where the polymer sheet 4 is absent, that is, the above-mentioned "gap" portion is end sealed at about 150° C. in a direction perpendicular to the flow direction of the original pouch. be done. In addition, the upper part of FIG. 4 shows the polymer sheet 4 on the lower pouch original fabric 8,
4 is a certain distance (for example, about 20 mm) from one side end (the right end in the figure) of the lower pouch original fabric 8, and the first and second
An interval of 5 determined by the speed difference of the transport mechanisms (for example, about 5
0 mm) indicates a situation in which the center lines of both in the width direction are shifted from each other (the situation between the second supply mechanism 23 and the third supply mechanism 24 in FIG. 3), and the downward The figure shows the edge of one side in the width direction where the side edges of each member of the laminate 6 match after the water-permeable sheet 7 is supplied thereon (the right edge in the figure). Only the cutter 50' is heat-sealed (the situation immediately before the second cutter 50' in FIG. 3). As you can see from these figures,
By the manufacturing method according to the present invention, it is possible to mechanically and continuously manufacture a continuous packaging pouch material in which a water-absorbing sheet is enclosed between a lower pouch material and a water-permeable sheet.

Further, the laminate 6 is cut at the end seal portion by a cutter 50'. As a result, in this example, the bag shape shown in FIGS. 1 and 2 (pouch size: 460 x 560 mm, polymer sheet size: 300 x 510 mm, nonwoven fabric size: 430
x 560 mm) A pouch equipped with a water absorbent sheet was obtained.

[0028]

[Effects of the Invention] According to the present invention, by supplying a plurality of base materials along a linear conveyance path and simultaneously providing various processing steps, it is possible to continuously produce pouches equipped with water-absorbing sheets in a completely automated manner that does not require manual work. In addition to making production possible, the water-absorbent sheet is enclosed within the sealed space formed by the lower pouch material and the water-permeable sheet, so that the water-absorbent sheet can be accidentally removed from inside the pouch during handling of the pouch. In addition, it is possible to prevent packaging materials such as perishable foods from being accidentally inserted into the water-absorbent sheet enclosing space, which is not originally a packaging material storage space.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an example of a pouch equipped with a water-absorbing sheet of the present invention, partially folded back.

FIG. 2 is a sectional view taken along line II-II in FIG. 1;

FIG. 3 is a diagram showing an example of the entire process diagram for manufacturing a pouch equipped with a water-absorbing sheet.

FIG. 4 is a diagram showing a state in which a polymer sheet is coated in the production of a pouch equipped with a water-absorbing sheet.

FIG. 5 is a cross-sectional view taken along line IV--IV in FIG. 3;

FIG. 6 is a sectional view taken along the line V--V in FIG. 3;

[Explanation of symbols]

1, 2... Base material, 7... Water-permeable sheet, 8, 9... Pouch original fabric, 6... Laminate, 4... Polymer sheet, 5... Fixed interval,
22, 23, 24, 25...first, second, third, and fourth supply mechanisms, 31, 32...first and second transport mechanisms, 40...mixed powder scattering mechanism, 50, 50'...cutter, 70,
...Side seal roll, 80...End seal roll, 8
0'...Pressure roll, 100...Heat embossing roll.

Claims (2)

[Claims] 1. A polymer sheet 4 containing a water-absorbing polymer therein, a water-permeable sheet 7 overlaid on the upper surface of the polymer sheet, and upper and lower sheets overlaid on both outer sides of a laminated sheet consisting of the polymer sheet 4 and the water-permeable sheet 7. A laminate 6 consisting of raw pouch fabrics 9 and 8, in which the upper end of the water-permeable sheet 7 is joined to the raw pouch 8 below, and both side ends and the lower end of the laminate 6 are connected to the water-permeable sheet 7. A bag-shaped pouch equipped with a water-absorbing sheet, which is made by joining the sheet and upper and lower pouch materials so that they are integrated. 2. A step of sequentially and intermittently feeding out a polymer sheet 4 containing a water-absorbing polymer therein, a lower pouch material 8 wider than the polymer sheet 4 from the lower part of the polymer sheet stream in the width direction of the polymer sheet 4. A step of continuously feeding the raw pouch fabric 8 so that the center line and the center line in the width direction of the raw pouch fabric 8 are overlapped at a position where they are shifted from each other.
Appropriate adhesive 10 is applied to the upper surface of the area where the polymer sheet 4 is not located, approximately parallel to the sides of the original pouch.
a step of continuously supplying at least the adhesive 10 from the side opposite to the side to which the adhesive 10 is applied;
a step of continuously supplying a water-permeable sheet 7 having a width up to the area where it has been applied from above; a step of further continuously supplying an upper pouch raw material 9 of approximately the same width as the lower pouch raw material from above; As a result, a laminate 6 is created in which the polymer sheet 4 is intermittently sandwiched between the water-permeable sheet 7 and both original pouch fabrics 8 and 9, and the adhesive 10 of this laminate 6 is also created. A water-permeable sheet 7 and both pouch original fabrics 8,
a step of sealing both pouch materials 8 and 9 in a direction perpendicular to the flow direction at a portion where the polymer sheet 4 is absent, and a sealing portion of the laminate 6 in the perpendicular direction. A method for producing a pouch fitted with a water-absorbent sheet, comprising the steps of: cutting the pouch.