JPH02273507A - Manufacture of filter medium - Google Patents

Abstract

PURPOSE:To prevent the falling of active carbon from the cut edge even when filter medium is cut off by bonding a first sheet directly to a second sheet to form an adhered sheet at a region wherein no active carbon is provided and which region is formed between regions wherein active carbon is provided. CONSTITUTION:Regions 3 having specified area wherein active carbon is provided are formed at predetermined intervals in the longitudinal direction and in the lateral direction as well over a first porous sheet 1 and then a second porous sheet 6 is superposed on said first sheet to form a laminated structure 7, following which the sheets 1 and 6 are directly joined together at a region 4, wherein active carbon is not provided and is formed between the region 3 by preparing the structure 7 into a body. Even when the filter medium thus formed is cut off, the active carbon therein is prevented from falling. Since adhesives are applied to such area where active carbon is not provided, deodorization performance of active carbon can be prevented from being lowered.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a method for manufacturing a filter medium in which activated carbon is enclosed between breathable sheets.

[Conventional technology]

Traditionally, the method for producing deodorizing filter media using activated carbon has been to create a bag using a breathable sheet such as paper or non-woven fabric, put activated carbon into the bag, and then close the opening of the bag. A method of sealing is used. However, this method has the disadvantage that the manufacturing process is complicated and the production efficiency is low because it involves the steps of making the bag, putting activated carbon into the bag, and sealing the mouth of the bag. For this reason, a method has been proposed in which activated carbon is uniformly dispersed on a first breathable sheet and a second breathable sheet is laminated thereon to produce a filter medium. Note that in order to join the first sheet and the second sheet, an adhesive is applied to either one of the sheets, or the adhesive is spread together with activated carbon.

[Question B that the invention attempts to solve]

However, in the filter medium obtained by this method, the activated carbon is uniformly present between the sheets, so when the filter medium is cut into a predetermined size, the activated carbon sometimes spills from the cut edge. A filter medium is generally sandwiched between frames of a predetermined size and used as a framed filter body. Therefore, when creating a filter, the filter material is cut to a predetermined size, but in the case of the filter material listed above, the activated carbon falls off from the cut edge, for example, the dust falls off, and the L. However, there was a drawback that the working conditions at the manufacturing site of the filter body were poor. In addition, the filter material described in
,! There is a danger that the surface of the activated carbon will be covered by the adhesive, and the deodorizing performance of the activated carbon will be impaired. However, the present invention is designed to prevent the activated carbon from spilling out even after cutting.
In imitation, there is a method for producing a filter medium in which active f.:1 charcoal and a contacting agent are present separately.

[! ! ! ! 1 step to solve problem ε] IE 1st-), present invention 411 &, breathable first sea 1.
After forming activated carbon presence areas of a predetermined area arranged at predetermined intervals in the width direction on the J. are laminated to create a laminatej5, and then the first sheet and the first sheet are directly joined in the activated carbon absent area formed between the activated carbon existing areas to integrate the laminate. t) relates to a method for manufacturing a filter medium, characterized in that: Hereinafter fζ, please refer to the drawings, especially FIG. 1.1. Therefore, the manufacturing method of the filter material according to the present invention will be explained in detail.7 First, the breathability first material!・Guide “Roll (I))”
i, ; m'/<"j =, - (move i, & (j to the right on the A surface), several activated carbon spreaders (2) installed at regular intervals,,4, Spread activated carbon (5) on the first sheet 1- (]).This activated carbon spreader (2)
The spraying [] opens and closes intermittently 7, and the activated carbon (5) is intermittently sprayed onto the first sheet (1). Therefore, as shown in Fig. 1, the area (3) where activated carbon is present has a substantially long side shape.
are arranged at regular intervals in the length direction and at regular intervals in the width direction, and the area other than the activated carbon presence area (3) becomes an activated carbon non-existence area (4). In addition, air permeable first sheet (1. Paper, non-woven fabric, etc. is used. Also, the properties of activated carbon are 1. Powdered or granular, so it can be used as an activated carbon spreader (2). 7, a general powder scattering device may be used. In addition to method 4, the activated carbon existing area (3) can be formed by the following methods in addition to method 4. First sheet (1)! - Evenly distributed over the entire area, flattened Y, 1. , 1 charcoal (5) is scattered and 7, the resurrection t/I charcoal 7? Activated carbon (5) may be removed from the area where the activated carbon is present (4) with an activated carbon suction device to form an activated carbon existing area (3) as shown in Figure 1 C1'. .Also,
The area corresponding to the activated carbon-free area (,1) of the first sheet (1) is made into a valley shape7, and there-・the first sheet 1・(
1) If activated carbon (5) is uniformly spread over the entire area of j::,
In the mountain-like area, the activated carbon (5) slides down into the valley-like area.2 Activated carbon (5) 171) Absent area (4) and activated carbon presence 1] IJ! (3) can be formed-4. Then, a breathable second sheet (6) is laminated to that 1-
Then, a laminate (7) is formed. Then, 7, the laminate (7) is added i, : E c tor (8), and activated carbon fζ exists] (1? in region (4))
・Mi゛・-1・(1) and the first sheet (6) are directly joined to integrally fix the C product (“12”).In addition, the breathable first sheet (6), ! : L-'i' 1. Paper, 1-knit non-woven fabric, etc. can be used. 1 in the activated carbon-free area (4). Jru first sheet (i)
As the horn method for face-to-face bonding of the first buff-1-(6) and the first buff-1-(6), the following methods can be used. That is, before laminating the second sheet (6), the first sheet (1),
By applying adhesive to the activated carbon-free area (4) of -11r, the first sheet (1) and the second sheet (6) can be directly joined with the adhesive of . In addition, 2. As the first sheet (1) and the second sheet (1),
Using a knitted fabric or non-woven fabric containing heat-adhesive fibers, J:
Using a heating roll as the J-force 11 pressure roll (8),
Heat is applied to the first sheet 1-(]) and the second sheet (6) from this roll (8) to develop adhesion to the heat-adhesive fibers. ) in the first
It is also possible to directly join the sheet (+) and the second sheet (i).Furthermore, if paper is used as the first sheet (+) and the receipt ω, 2. Water is applied to the existing area (4), and the first sheet (1) and the second sheet (6) are pressurized from the hydrogen bond Q,'' using a heated roll (8).・Activated carbon-free area (
In step 4), direct bonding may be performed. As the adhesive, conventionally known adhesives such as carboxymethyl cellulose, alginate sorter, polyvinyl alcohol, vinyl acetate, ethyl meccrylate, etc. can be used. In addition, when heat-adhesive fibers are used as a component of the first sheet (1) or the first sheet (6), composite fibers with polypropylene as a core component and polyethylene as a sheath component, and nylon 66 as a core component are used. Conventionally known thermoplastic fibers whose surfaces soften and melt at relatively low temperatures, such as composite fibers having nylon 6 as a sheath component, undrawn polyester fibers, and undrawn polypropylene fibers, can be used. As the roll (8), - A smooth roll is used for boat fishing, but the part that matches the activated carbon absent area (4) becomes a convex part, and the part that matches the activated carbon existing area (2) becomes a concave part. An embossing roll may be used. When this embossing roll is used, even if the amount of powder in the activated carbon presence area (3) is increased, the first sheet (1) and the second sheet ( 6), which facilitates direct bonding between the first sheet (1) and the second sheet (6). (1)
and the second sheet (6) are cut at the sealed portion 0ω where they are directly joined, and used as a filter body with a frame or by being sandwiched between a frame or the like. The filter may be deodorized, decolored, etc. by actively allowing gas or liquid to flow in and out of it, or it may be deodorized, bleached, etc., without actively allowing gas or liquid to flow in or out. may be,
This filter body can be used as an air purifier, air conditioner, air conditioner, or refrigerator deodorizer. It is used by being incorporated into sanitary napkins, disposable diapers, etc. In the present invention, both the first sheet (1) and the second sheet (6) are breathable. Although outside the scope of the present invention, the first sheet (1) or the second sheet (
It is also conceivable to use a breathable sheet for either one of 6) and a non-breathable sheet for the other to obtain a filter body through which gas or liquid can flow in and out from only one side.

[Action and effect of the invention]

As explained above, the filter material obtained by the method according to the present invention has a first sheet (1) as shown in FIGS. 2 and 3.
and a second sheet (6) are directly joined to each other.
It consists of an enclosure part (11) in which activated carbon (5) is enclosed,
The enclosing parts 00 are arranged at regular intervals in the longitudinal direction and at regular intervals in the width direction. Then, this filter material is cut at the sealed portion 0ω when producing a filter body with a frame. Therefore, there is no chance of activated carbon spilling out from the cutting edge.
Since no dust is generated, the working environment at the manufacturing site of the filter body is improved. In addition, in the filter medium obtained by the method according to the present invention, the first sheet (1) and the second sheet (6) are bonded together at the sealed part 00), and the activated carbon (5) is enclosed in the sealed part (11). There is no need for an adhesive component to be present. Therefore, since only the activated carbon (5) can be present in the enclosing part (11), the adhesive component does not cover the surface of the activated carbon (5), and the deodorizing performance etc. of the activated carbon (5) is not inhibited. This has the effect of preventing

[Brief explanation of drawings]

FIG. 1 is a schematic diagram schematically showing a method according to an example of the present invention, FIG. 2 is a plan view of a filter material obtained by a method according to an example of the present invention, and FIG. is A in Figure 2
- It is a cross-sectional view when cut along the A line. (]) -...] First sheet (3)...Activated carbon presence area. (4)--Activated carbon absent area, (5)--Activated carbon. (6)...Second sheet, (7)-...Laminated product. 0IID--Sealed portion where the first sheet and second sheet are directly joined. 00--Enclosed part where activated carbon is enclosed between the first sheet and the second sheet

Claims (1)

[Claims] After forming activated carbon presence areas of a predetermined area arranged at predetermined intervals in the longitudinal direction and at predetermined intervals in the width direction on the first breathable sheet, a second breathable sheet is laminated thereon to form a laminate. A method for manufacturing a filtration medium, comprising: creating a filtration medium, and then directly joining the first sheet and the second sheet in an activated carbon-free area formed between the activated carbon-existing areas to integrate the laminate. .