JPS6336814B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a filter that is inexpensive, lightweight, easy to handle, and recyclable. Regarding filters that swell when wet.

Various tools such as sprinklers and hoses with small holes are used to water crops, etc., but if water is contaminated with mud or dirt, it can cause clogging, so be sure to remove it beforehand. It is preferable. For example, if muddy water pumped up by a pump is passed through a filter before being connected to a hose, clogging can be prevented and irrigation can be carried out for a long time.

The present invention provides a filter suitable for such purposes, which is not bulky when transported or stored, is easy to replace old and new filters, and is inexpensive. The present invention relates to a filter in which both outer layers of a plastic resin film and an inner layer of a sheet-like filter material are each integrated into a tube shape by heat sealing.

Examples of the filter of the present invention are shown in perspective views in FIGS. 1 and 2. For example, as shown in FIG. 3, these filters are made by sandwiching a sheet-like filter material 2 between non-perforated thermoplastic resin films 1 and 3, and forming a heat-sealed portion 4 around the periphery, leaving an inlet and an outlet. You can get it.

The thermoplastic resin film forming the outer layer is formed of any synthetic resin film that can provide flexibility to the outer layer. Examples of such synthetic resins include ethylene, propylene, 1-butene, 4-
Olefin-based synthetic resins such as methyl-1-pentene, other olefin polymers or copolymers, or copolymers of one or more of these olefins and dienes; styrene;
Polymers or copolymers of vinyl alcohol, acrylic acid, acrylic acid alkyl esters, methacrylic acid, methacrylic acid alkyl esters, vinyl chloride, vinylidene chloride, vinyl acetate, other vinyl compounds, or one or more of these vinyl compounds. and vinyl-based synthetic resins such as copolymers with olefins that can be copolymerized with this; polyethylene terephthalate, polyethylene-2,
Ester-based synthetic resins made from 6-naphthalate, other glycols or their functional derivatives, and dicarboxylic acids or their functional derivatives; Amide-based synthetic resins such as nylon;
Polyurethanes; other arbitrary synthetic resin materials or mixtures thereof can be mentioned. These synthetic resin films may be foamed films. The film may also contain additives such as carbon black, such as UV inhibitors, antioxidants, inorganic and organic fillers, colorants, and other additives.

The thickness of the outer layer is not particularly limited as long as it expands and withstands the operating pressure when water is flowing through it, and has a flat shape when water is not flowing through it, and can be appropriately selected depending on the type of synthetic resin used, but for example, from about 0.05 to Approximately 3 mm is suitable. It is also desirable that the outer layer be transparent so that the situation can be seen from the outside.

The inner layer is made of a water-permeable and water-insoluble sheet material.

For the inner layer, a thermoplastic synthetic resin fibrous material is used.
Sheets formed by dry or wet papermaking are bonded together at a temperature higher than the melting point of the thermoplastic synthetic resin in a state where only the surface of the fibrous material is semi-molten or partially molten. Water-permeable nonwoven fabrics, paper-like materials, thermoplastic synthetic resin fibrous materials, and sheets formed by paper-making other fibrous materials that do not melt at the melting point of the resin are used as thermoplastic materials. At a temperature above the melting point of the synthetic resin,
In addition, water permeable nonwoven fabrics and paper-like materials suitable for use as filter materials are used, which are bonded by heat treatment at a temperature at which other fibrous materials do not melt.

As these thermoplastic synthetic resin fibrous substances, the thermoplastic synthetic resin fibrous substances (including synthetic pulp) exemplified as the material for the outer layer are used.

Among the synthetic resins exemplified for the outer layer, the thermoplastic resin fibrous materials used for forming the latter water-permeable sheet-like material include synthetic resin fibrous materials that melt at low temperatures and those that can melt at higher temperatures. Combinations with fibrous materials of other synthetic resins, or fibrous materials partially composed of synthetic resins that melt at low temperatures and synthetic resins that melt at higher temperatures, plant fibers, recycled fibers, and animal fibers. Natural or regenerated fibers such as fibers, mineral fibers such as asbestos, glass wool, lock fibers, and combinations of these with synthetic resin fibers having a high melting temperature can be used.

Furthermore, these water-permeable sheet materials are made of talc,
It may be a structure containing whitebait balloons, calcium carbonate, rubber particles, synthetic resin particles, etc.

Among these, fibrous materials called synthetic pulp of thermoplastic synthetic resins such as polyethylene and polypropylene, synthetic resin fibrous materials such as polyvinyl alcohol with a higher melting point, mineral fibrous materials such as glass wool, or any mixture thereof. Non-woven fabrics and paper-like materials in which the fibrous materials are fixed in place by wet or dry paper-making and heat treatment to melt some of the fibrous materials of thermoplastic synthetic resin, as well as polyethylene fibrous materials. Like the combination of fibrous polypropylene, the fibrous materials of a synthetic resin with a low melting point and a synthetic resin with a high melting point are made into a sheet-like product using a dry or wet process, and the polyethylene with a low melting point is melted to form polypropylene with a high melting point. Non-woven fabrics, paper-like materials, etc. prepared without melting are particularly preferably used.

The water-permeable sheet-like material of the inner layer can be made into a sheet-like material with a desired amount of water permeability by appropriately selecting the type of fibrous material, its size, shape, proportion of different fibers used, thickness of the sheet-like material, etc. be able to.

In the filter of the present invention, the space between one outer layer and the inner layer is used as an inlet for the filtered material, and the space between the other outer layer and the inner layer is used as an outlet. An example of how to use it is shown in FIG. A hard PVC branch pipe 6 is connected to the irrigation tube 5 having a large number of small holes, and a filter is connected between the water supply pipe 7 and the branch pipe. Enlarged sectional views of the water inlet vicinity A and the outlet vicinity B are shown in FIGS. 5 and 6, respectively. The filter is inserted into the branch pipe 6 and water pipe 7,
It is fixed with a binding device 8 such as a string, wire, or tape.

The filter of the present invention is manufactured in such a manner that its overarea is changed depending on the purpose. In addition, two or more inner layers made of sheet-like overfill materials are sometimes provided, and if sheet-like overfill materials with different overperformance properties are used in a stacked manner, the usable time before clogging can be extended.

Further, when there are two inner layers, use as shown in the cross-sectional views of FIGS. 7 and 8 is also possible. however,
W is the method of flow of the coverage. In FIG. 7, among the inner layers 21 and 22, the inner layer 22 is first used as an overlayer, and then when the inner layer 22 is clogged, the inner layer 22 is used as an overlayer.
1 and 22 are drawn toward the opposite outer layer side, and the inner layer 21 is used as an overlayer as shown in FIG.

Since the filter of the present invention is in the shape of a bendable tube, the accumulated dust and the like can be pushed out from the outer layer by crushing or squeezing the filter, making it possible to reuse it.

The filter of the present invention is used not only for irrigation purposes but also as a filter for various fluids such as water, oil, gas, etc. used in various industrial equipment, analytical equipment, and the like.

The filter of the present invention is flat when not in use, and it may be difficult to open the overlapping films when inserting the hard tube into the inlet and outlet. Therefore, rather than heat-sealing the inner layer and both outer layers of the filter at the same portion (see FIG. 9a), it is better to heat seal the filter in FIGS.
It is preferable to heat seal only the inner layer and one of the outer layers, as shown in FIG. This simplifies the operation of opening the entrance and exit films.

[Brief explanation of drawings]

FIGS. 1 and 2 are perspective views. FIG. 3 is a perspective view of the main parts explaining the method of manufacturing the filter. FIG. 4 is a perspective view of essential parts showing how to use the filter. FIG. 5 is an enlarged sectional view of part A in FIG. 4. FIG. 6 is an enlarged sectional view of part B in FIG. 4. FIGS. 7 and 8 are cross-sectional views showing how to use the filter. FIG. 9 is a sectional view showing a method of heat sealing the filter. 1, 3...outer layer, 2,21,22...inner layer, 4,4
1...Heat seal part, 5...Irrigation tube, 6...Branch pipe, 7...Water pipe.

Claims (1)

[Scope of Claims] 1. A filter characterized in that both outer layers of a non-perforated thermoplastic resin film and an inner layer of a sheet-like filtration material are each integrated into a tube shape by heat sealing. 2. A filter in which both outer layers of non-perforated thermoplastic resin film and a partition layer of sheet-like filtration material sandwiched between them are stacked together and heat-sealed on both sides to form a tube-like structure; The filter according to claim 1, wherein a space between the outer layer and the partition layer is a liquid inlet, and a space between the other outer layer and the partition layer is a liquid outlet.