JPH03606A - Sprinkling method and device for mixed powder for water absorption sheet - Google Patents

Abstract

PURPOSE:To sprinkle a mixed powder evenly, and at the same time, to enable a complete automation of a sprinkling mechanism possible by a method wherein the sprinkling quantity of a mixed powder is appropriately and accurately adjusted by changing the peripheral speed of a roller with grooves to the carrying speed of a basic material by a first carrying conveyor. CONSTITUTION:A water absorption sheet is formed into a laminated body for which a mixed powder 16, which is composed of an absorbent resin 13, functional powder 14 and binding agent 15, is sprinkled between a basic material 1 and basic material 2. A sprinkling mechanism has an upside-down trapezoid shaped container 41, and the lower side of the container is closed by a roller with grooves 42. By the rotation of the roller with grooves 42, only the powder in the grooves 43 is discharged outside. At this time, a claw 44 rakes off excessive powder on the groove, therefore, the quantity of the powder to be discharged is always fixed. As a sprinkling quality of an absorbent resin per 1m<2> of sheet, it is desirable to be within a range of 0.1-200g, and the sprinkling quantity is adjusted by changing the peripheral speed of the roller with grooves at random.

Description

DETAILED DESCRIPTION OF THE INVENTION [Prior Art] Spreading of water absorbent material onto a water absorbent sheet has conventionally been performed manually. That is, the water-absorbing material is manually spread between two polymerized substrates, and the ends are overlapped and sandwiched and joined using heating rolls. However, such a dispersion method is not only unsuitable for continuous production of water absorbent sheets, but also makes it difficult to uniformly distribute the mixed powder.

[Problem to be solved by the invention]

The present invention creates a functional water-absorbing sheet by forming multiple outer sheets, folding one corresponding end of the sheet, and heat-sealing the other corresponding end, without requiring any manual work. It is an object of the present invention to provide a method and apparatus for continuously dispersing powder containing a water-absorbing material suitable for a method for automatically manufacturing products from products to finished products.

[Means to solve the problem]

That is, the first aspect of the present invention is a method for dispersing a mixed powder containing a water-absorbing material inside a base material 1.2, in which the mixed powder is uniformly spread onto the base material 1 by rotating a grooved roll. A second aspect of the present invention is a method for dispersing a mixed powder containing a water-absorbing material, which is characterized by dispersing the mixed powder on the base material 1 containing the water-absorbing material. a first transport mechanism 31 that horizontally transports the laminate 3 in which the mixed powder is sandwiched and integrated between 1 and 2;
A cutter 50 that cuts the laminate 3 into a predetermined length, a second conveyance mechanism 32 that conveys the cut polymer sheet 4 at a higher speed than the above-mentioned conveyance speed, and a cutter 50 that cuts the laminate 3 into a predetermined length, a second conveyance mechanism 32 that conveys the cut polymer sheet 4 at a higher speed than the above-mentioned conveyance speed, and a cutter 50 that conveys the cut polymer sheet 4 at a higher speed than the above-mentioned conveyance speed. The base material 6, which is wider than the base materials 1 and 2, is used as the base material 1,
a folding mechanism 60 that folds both ends of the base material 6 onto both ends of the base material 2;
A third supply mechanism that supplies a base material 7 having a width substantially equal to the folded base material 6 from the upper part of the second conveyance mechanism at the second speed, and a side seal 70 that heat-seals the folded portion. , an end seal 80 that heat-seals the fixed spaced portion between the polymer sheets 4 of the side-sealed laminate 11, and a cutter 90 that cuts the end seal portion, and the dispersion mechanism 40 is a mixed powder having an inverted trapezoidal shape. A grooved roller 42 provided at the lower opening of the container, a plurality of grooves 43 formed on the circumferential surface of the roller to hold a fixed amount of mixed powder, and a plurality of grooves 43 formed on the circumferential surface of the roller to scrape off an excess amount of powder in the grooves 43. 41. This apparatus is characterized in that it includes a pawl 44 mounted along the outer wall of a water-absorbing sheet.

Next, a functional water-absorbing sheet manufacturing apparatus to which the mixed powder spreading apparatus of the present invention is applied and a manufacturing method using the apparatus will be described with reference to the drawings.

In FIG. 2, 2L 22, 23 and 24 are the rolls on which the base materials 1.2 and 6.7 are respectively wound up, and 31.31 are the rolls on which the base materials 1.2 and 6.7 are wound, respectively. 2nd conveyor belt, 40 is water absorbent resin 1
3. A dispersion mechanism for the mixed powder 16 consisting of the functional powder 14 and the binder 115, 100 is a heating roll, 50 is a first cutter, 60 is a folding mechanism, 70 is a side seal roll, 80 is an end seal roll, 90 is the second cutter.

The base material 1 unwound from the roll 21 is transported horizontally to the position of the cutter 50 by a first transport mechanism including a first vi transport belt 31, which is not completely shown. A scattering mechanism 40 for the mixed powder 16 is provided above the conveyance mechanism.

The mixed powder 16 is spread onto the base material l by the scattering mechanism 40, and the base material 2 is stacked on top of the base material l from above in the same direction as the base material 1 at the same speed as the above-mentioned first conveyance speed. As they are supplied, they are sandwiched and integrated by heating rolls 100 and conveyed in the form of a laminate 3 on the first conveyor belt.

A rotary cutter 50 is located downstream of the first conveyor belt 31.
is provided. The rotation of the rotary cutter 50 is synchronized with the conveyance of the laminate 3, and the laminate 3 is cut into a constant length. The cutter 50 has two blades depending on the dimensions such as rotation diameter.
An appropriate number such as 2 or 4 can be provided.

After the laminate 3 is cut by the cutter 50, it is gripped by the second conveyor belt 32 as a polymer sheet 4. Since the second conveyor belt 32 is driven at a slightly higher speed than the first conveyor belt 31, the laminate After 3 is cut by the cutter 50, a gap is opened at the cut portion, and the paper is conveyed with a constant gap 5 between the end faces. Thereafter, the polymer sheet 4 is transported by a second transport mechanism (not shown) from the second transport roller 32 onwards.

In this conveyance path, a base material 6 wider than the polymer sheet 4 is folded into the folding mechanism 60 from below the folding mechanism 60 along its edge, and is fed so as to overlap with the polymer sheet 4 in the same direction. . Folding mechanism 6
In the case 0, both ends of the base material 6 are folded above the both ends of the polymer sheet 4 by an amount wider than the polymer sheet 4.

A base material 7 having a width approximately equal to the width of the folded base material 6 is stacked on the folded base material 6 from above in the same direction as the base material 6 at the same speed as the second conveyance speed. After that, it is transported to the side seal roll 70. As shown in FIG. 5, the side seal roll 70 has two heating rollers at positions corresponding to the folded portions.
The substrates 6 and 7 are rotated at the same conveyance speed. 20 The roller surface may be flat or embossed.

The laminate 11 whose side ends are sandwiched and joined to the side seal roll 70 is sent to the end seal roll 80 with the polymer sheets 4 arranged at a constant interval 5 within the upper and lower base materials 6 and 7. As shown in FIG. 6, in the end seal roll 80, an end seal portion 81 having a width corresponding to a constant interval 5 is constantly rotating at the same speed as the second conveyance speed. is set to be synchronized so that it is located at a position exactly corresponding to interval 5. End seal part 81
are appropriately distributed depending on the dimensions such as the rotating diameter, and the surface thereof may be either flat or embossed.

The end-sealed laminate 8 is cut into sheets by a cutter 90 similar to the cutter 50.

The water absorbent sheet thus completed is as shown in FIG. That is, a mixed powder 16 consisting of a water-absorbing resin 13, a functional powder 14, and a binder 15 is spread between the base material 1 and the base material 2 to form the laminate 3. Furthermore, the lower part and both side edges of this laminate 3 are wrapped in a base material 6, the upper surface of which is covered with a base material 7, and both side ends of this base material 7 and the folded portion of the base material 6 are adhered. .

At least one of the materials inside the base material is water-permeable, such as paper, nonwoven fabric, porous sheets such as porous polyethylene sheets and porous polypropylene sheets, cellophane, vinylon film, or laminates of these papers and nonwoven fabrics, and sized paper. or non-woven fabric with a cellulose membrane formed using viscose, or a cellulose membrane with fine pores formed,
Thermoplastic films that are foamed to have fine continuous pores during film production, those that are stretched with the addition of an inorganic substance or a high melting point nucleating agent to form fine continuous pores,
Any material may be used as long as it has a certain degree of water permeability, such as paper made of a mixture of polyethylene, polypropylene, and valves.
Further, 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.

In addition, the base materials 6 and 2 must be made of a material that can be bonded to each other. Non-woven fabrics impregnated with or mixed with thermoplastic resins such as polyamide or fibers such as polyolefin, polyester, polyamide, films made of thermoplastic resins or films laminated with these materials, materials coated with pressure-sensitive image adhesives, heat-sensitive adhesives, etc. Materials coated with adhesive can be used.

Water-absorbing resins include starch/acrylate graft polymers, carboxymethylcellulose crosslinked products, vinyl alcohol/acrylate copolymers, polyacrylonitrile hydrolysates, crosslinked polyacrylates, modified polyvinyl alcohol, and acrylic acid. Examples of functional powders include salt polymers, acrylate/acrylamide copolymers, isobutylene/maleic anhydride copolymers, etc., and it is of course possible to use two or more of the above.Functional powders include antibacterial agents, Examples include deodorizers, ethylene adsorbents, and the like.

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.

Deodorizers include physical adsorption deodorizers, chemical deodorizers, and physical deodorizers.
Chemical deodorizers can be used, but there is no particular limitation as long as they remove bad odors.

■Physical adsorption deodorizer Neutral activated carbon, zeolite, activated alumina, acid clay, etc.■Chemical, deodorizing agent Acidic agent, alkaline agent, oxidizing agent, reducing agent ring■Physical/chemical deodorizing agent Alkaline or acidic impregnated activated carbon, adsorbs vegetable oil zeolite, etc. ■Other iron phthalocyanate derivatives, desulfurizing salts such as zinc oxide,
Ethylene gas adsorbents such as mixtures of iron(II) compounds, L-ascorbic acid and alum are carbon molecular sieves adsorbed with bromine, preferably those with 4 to 6 micropores, or sodium bromate or bromate. Examples include particles having a particle size of 0.01 to 100 μm, which are obtained by adding acidic water in which potassium is dissolved to activated carbon, reacting it, then drying and pulverizing it. 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.

Example 1 A mixed powder dispersion mechanism 40 will be described in detail with reference to FIG. 1.

This dispersion mechanism 40 has a container 41 in the shape of an inverted trapezoid.

As shown in Fig. 1, the lower side of this container is closed by a grooved roller 42 to prevent powder from leaking, and only the powder in the groove 43 is discharged to the outside by the rotation of the grooved roller 42. It has become. 44 is a claw that scrapes off excess powder on the groove, and is set so that the amount of powder discharged is always constant. The amount of water absorbent resin to be sprayed per sheet 1rI'r is preferably in the range of 0.1 to 200 g, particularly preferably in the range of 1 to 50 g. The amount of spraying can be adjusted by arbitrarily changing the circumferential speed of the grooved roller. Further, the amount of the functional powder to be sprinkled per sheet is not limited as long as it is within a sufficient range to provide functionality.

〔Effect of the invention〕

In the present invention, by changing the circumferential speed of the grooved roller with respect to the 1 m feed rate of the base material by the first conveyor belt 31, the amount of the mixed powder to be spread can be appropriately and accurately adjusted. can be evenly distributed.

This spreading mechanism does not require manual labor and can be used in fully automated continuous production equipment.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the dispersion mechanism of the mixed powder, Fig. 2 is a diagram showing the manufacturing process of the water-absorbing sheet, Fig. 3 is a diagram showing the structure of the water-absorbing sheet, and Fig. 4 is a diagram showing details of the folding mechanism. FIG. 5 is a diagram showing a side seal roll, and FIG. 6 is a diagram showing an end seal roll.

Claims (1)

[Claims] 1. In a method of scattering a mixed powder containing a water-absorbing material inside the base materials 1 and 2, the mixed powder is uniformly spread on the base material 1 by rotating a grooved roll. A method for dispersing mixed powder containing a water-absorbing material, characterized in that: 2. A spreading mechanism 40 that spreads a mixed powder containing a water-absorbing material onto the base material 1, and a first transport that horizontally transports the laminate 3 in which the mixed powder is sandwiched and integrated between the base materials 1 and 2. Mechanism 31
, a cutter 50 that cuts the laminate 3 into a predetermined length, a second conveyance mechanism 32 that conveys the cut polymer sheet 4 at a higher speed than the above-mentioned conveyance speed, and a second a second supply mechanism that supplies a base material 6 wider than the base materials 1 and 2 at a speed so as to overlap the base materials 1 and 2, the base material 6;
A folding mechanism 6 that folds both ends of the base material 2 onto both ends of the base material 2.
0, a third supply mechanism that supplies a base material 7 having a width substantially equal to the folded base material 6 from the upper part of the second conveyance mechanism at the second speed; a side that heat-seals the folded portion; Seal 70, side sealed laminate 11
The dispersion mechanism 4 includes an end seal 80 that heat-seals a portion at a certain distance between the polymer sheets 4 and a cutter 90 that cuts the end seal portion.
0 is a grooved roller 42 provided at the lower opening of a mixed powder container 41 having an inverted trapezoidal shape, a plurality of grooves 43 formed on the circumferential surface of the roller for holding a fixed amount of mixed powder, and the groove 4.
3. A device for dispersing a mixed powder containing an absorbent material for producing a water-absorbing sheet, characterized in that the device includes a claw 44 attached along the outer wall of the capacity 41 to scrape off an excess amount of powder in the container 3.