CN1158044C - Clean-room cleaning cloth - Google Patents

Abstract

The invention relates to a clean-room cleaning cloth consisting of a microfilament nonwoven material with a substance weight of 30 to 300 g/m<2>. Said nonwoven material consists of melt-spun, aerodynamically drawn multi-component continuous filaments which are immediately arranged so as to form a nonwoven and which have a titer of 1.5 to 5 dtex. Optionally, at least 80 % of the multi-component continuous filaments can be split into micro-continuous filaments with a titer of 0.1 to 1.0 dtex after presetting and then set.

Description

Purifying Room Cleaning Fabrics

Technical field

The present invention relates to clean room cleaning fabric, which is composed of a microfilament non-woven material with a weight per unit area of 30 to 300 g/m ² .

Background technique

Clean rooms are widely used in the production, testing and management of precision products. It is important that various processing steps be carried out in a strict environment free of small particles. In high-tech products, such as microelectronic circuits, optical or pharmaceutical products, the improvement of production continuously puts forward higher requirements for the particle content of the clean room. In particular, the class 100 clean room requires room air per cubic foot, size Particles ≥ 0.5 μm are within the range of up to 100 particles, or in the equivalent metric clean room grade M3.54, requiring no more than 3530 particles with a size ≥ 0.5 μm per cubic meter of room air [per million (parts per million - ppm) or particles per billion (parts per trillion - ppb)]. Integrated circuits will be produced on so-called "silicon wafers," thin, single wafers of silicon. Integrated circuits require precise electrical connections between transistors and other electronic devices. The individual circuit components are connected through a conductive film composed of deposited metal. In this layer, the printed conductor structure is produced by a photolithographic process. The insulating layer between the underlying semiconductor component and the deposited metal film only allows electrical connections at defined locations. The surface of the "silicon wafer" is coated with an insulating layer, after which the individual devices are made, but the "silicon wafer" is previously deposited with conductive metal to make the printed wiring structure. Contamination, such as fiber fragments or dust particles, can lead to short circuits between the components and thus at least partially disable the function of the provided circuit. The basic requirement here is therefore that all surfaces and workpieces are as free from contamination as possible.

Woven or knitted cleaning fabrics are known from documents US 4,888,229 and US 5,229,181, their edges being hemmed with a special trim, which prevents fluff from showing and fiber fragments. Furthermore, decontaminating room cleaning fabrics consisting of nonwoven materials are known from documents US 4,328,279 and 5,736,469. To reduce the amount of extractable ions or to prevent electrostatic loading, a chemical coating is applied to the surface of the fibers forming the nonwoven. Documents US Pat. No. 5,320,900 and US Pat. No. 5,645,916 describe a purifying room cleaning fabric consisting of a mixture of fibers reinforced by water jet treatment of nonwoven materials. The fibers are synthetic fibers such as polyester and cellulose - or regenerated cellulose fibers. A disadvantage of these familiar cleanroom cleaning fabrics is that they cannot withstand the laundering process, however without the laundering process the highest cleanroom rating of 10 or better cannot be achieved. So this grade is currently only used for braiding or knitting continuous filaments.

Contents of Invention

The object of the present invention is to provide inexpensive, washable clean room cleaning fabrics which meet the requirements of clean room class 100 and a method for producing the clean room fabrics. The clean room cleaning fabric based on the microfilament spun-bonded non-woven material according to the present invention can be applied to clean room grade 10 or higher through the following clean room washing process.

According to the present invention, the task is accomplished with clean room cleaning fabrics, which are composed of a microfilament non-woven material with a weight per unit area of 30 to 300 g/m ² , said non-woven material is melt spun, Pneumatically stretched and directly laid into a fiber web composed of multicomponent continuous filaments with a denier of 1.5 to 5 dtex, at least 80% of the multicomponent continuous filaments are split into fine continuous filaments with a denier of 0.1 to 1.0 dtex and reinforcement. The purifying room cleaning fabric has a surface structure into which dust particles and liquids penetrate well and adhere thereto. Furthermore, since it is composed of continuous filaments, there are very few fiber breaks in clean room cleaning fabrics. The cleaning fabric does not contain lint, and the edges of the cleaning fabric do not have to be seamed or trimmed.

Preferred decontaminating room cleaning fabrics are those in which the nonwoven material is composed of melt-spun, pneumatically stretched and directly laid multicomponent continuous filaments of a denier of 2-3 dtex and at least 80 % of multi-component continuous filaments are split into fine continuous filaments with denier of 0.1-0.3dtex and reinforced.

Preferred decontaminating room cleaning fabrics are those whose multicomponent continuous filaments are bicomponent continuous filaments composed of two mutually incompatible polymers, particularly a polyester and a polyamide. Such bicomponent-continuous filaments have good splittability to ultrafine continuous filaments, resulting in a reasonable ratio of strength to weight per unit area.

A preferred decontaminating room cleaning fabric is one in which the multicomponent continuous filaments have a segmented segmented cross-section in the shape of a segmented pie or "pie" in which the segments alternately contain two incompatible polymers One of. In addition to this multicomponent continuous filament with segmented pie-shaped structure, incompatible polymers in the multicomponent continuous filament may also be arranged side by side (s/s), which is conducive to the production of coiled filaments . This arrangement of incompatible polymers within the multicomponent continuous filaments proved to be very splittable.

Preferred decontaminating room cleaning fabrics are such that at least one of the incompatible polymers forming the multicomponent continuous filaments contains an additive such as a pigment, a permanently acting antistatic agent and/or an effect on hydrophilicity or hydrophobicity Addition of performance, the maximum amount is to meet the requirements of the allowable extractability value in water and isopropanol. Decontaminating room cleaning fabrics composed of dope-dyed filaments have very good wash stability. In addition, additives can reduce or prevent static electricity and improve moisture transport properties.

The process for producing clean room cleaning fabrics according to the invention consists in that multicomponent continuous filaments are spun from the melt, stretched pneumatically and laid directly into a fiber web, pre-reinforced if necessary, and the non-woven material is reinforced with high-pressure fluid jets , while splitting into fine continuous filaments with a fineness of 0.1 to 1.0 dtex, preferably a fineness of 0.1 to 0.3 dtex. The decontaminating room cleaning fabric thus obtained has a very uniform density, a uniform fiber distribution, no tendency to delaminate and exhibits a high modulus value.

The production of decontaminating room cleaning fabrics is preferably carried out by consolidating and splitting the multicomponent continuous filaments by impacting each side of the nonwoven material multiple times, at least once, with a high pressure water jet. This results in a clean room cleaning fabric having a good surface with >80% splitting of groups of continuous filaments. Furthermore, the purifying room cleaning fabrics according to the invention are distinguished by good specific water absorption and low drying times.

According to the present invention, the decontaminated room cleaning fabric can be used multiple times as a wipe.

The advantage of the clean room cleaning fabric is that it meets the washability requirements of the clean room in the industry, and can be applied in clean room grade 10 or higher.

Detailed ways

example 1

From a polyethylene terephthalate-poly(hexamethylenediamine adipate) (PET-PA66)-bicomponent-continuous filament, a "stuffing" with a weight per unit area of 57 g/ ^m2 was produced. Filament flor, "pie" filaments are subjected to water jet needle punching at a pressure of up to 250 bar on both sides. After needling with a water jet, the starting filaments are split evenly, and the titer of the bicomponent continuous filaments is about 0.1 dtex.

Example 2

A (s/ ^s ) filament mesh, subjected to water jet needling at pressures up to 250 bar on both sides. After needling with a water jet, the starting filaments were evenly split to a bicomponent continuous filament with a titer of about 1.0 dtex.

Example 3

From a polyethylene terephthalate-poly(hexamethylenediamine adipate) (PET-PA66)-bicomponent continuous filament in which the weight ratio of PET to PA66 is 60 to 40, a A filament mesh with a weight per unit area of 80 g/m ² (s/s), subjected to water jet needle punching at a pressure of up to 250 bar on both sides. After needling with a water jet, the starting filaments are evenly split, and the bicomponent continuous filaments have a fineness of about 0.1 dtex and a crimped filament structure.

Example 4

Production of a (pie-shaped) filament with a weight per unit area of 70 g/ ^m2 from a polyethylene terephthalate-poly(caprolactam) (PET-PA6)-bicomponent continuous filament The web is subjected to water jet needling at a pressure of up to 250 bar on both sides. After needling with a water jet, the initial filaments are split evenly, and the fineness of the bicomponent continuous filaments is about 0.1 dtex.

performance table non-woven material example 1 example 1 Example 2 Example 2 Example 3 Example 4 components PET/PA66 PET/PA66 PET/PA66 PET/PA66 PET/PA6 PET/PA6 Weight g/m ² 57 57 65 65 80 70 reinforcement water jet treatment water jet treatment water jet treatment water jet treatment water jet treatment water jet treatment final treatment no washing clean room washing no washing clean room washing no washing Dipping without washing Fineness 0.1dtex 0.1dtex 1.0dtex 1.0dtex 1.0dtex 0.1dtex performance Fractions extracted in biaxial vibration 2.5 9.4 1.8 6.6 5 8 Water absorption rate(cm ³ /m ² ) 304 387 400 482 490 370 Specific absorption rate (cm ³ /g) 5.3 6.8 6.2 7.4 7.3 6.6 Fiber (per cm ² ) 6 5.6 7.8 5.2 15 30 Specific fiber (per cm ² /g) 0.105 0.0098 0.120 0.08 0.2 0.4 Half value absorption time (s) 20 7 70 3 3.5 2.8 Ion (ppm)-Na-K-Mg-Ca-Cl 191.80.20.17 12151656 443.40.380.37 117.41555 930.8240 5.340.5200 Extract H ₂ O Isopropanol 0.200.53 0.20.41 0.280.24 0.30.13 0.20.3 0.20.3 Flex-Detection (Particle Count) 260 410 410 1000

Claims (12)

1. Purifying room cleaning fabric, which is made of a micro-filament non-woven material with a weight per unit area of 30 to 300g/ ^m2 , said non-woven material is melt-spun, pneumatically stretched and directly laid Multicomponent continuous filaments forming a fiber web with a titer of 1.5 to 5 dtex, the multicomponent continuous filaments, if necessary, after preconsolidation, are at least 80% split into fine continuous filaments with a titer of 0.1 to 1.0 dtex and reinforcement. 2. Purifying room cleaning fabric according to claim 1, characterized in that the nonwoven material consists of melt-spun, pneumatically stretched and directly laid multicomponent continuous filaments of a fiber web with a denier of 2 to 3 dtex , the multicomponent continuous filaments are split into fine continuous filaments with a denier of 0.1 to 0.3 dtex and consolidated after at least 80% of the multicomponent continuous filaments are optionally preconsolidated. 3. Decontaminating room cleaning fabric according to claim 1 or 2, characterized in that the multicomponent continuous filaments are bicomponent continuous filaments composed of two mutually incompatible polymers. 4. The decontaminating room cleaning fabric according to claim 3, characterized in that the multicomponent continuous filaments have a section of a segmented pie-shaped multi-segment structure, wherein the segments alternately contain one of two incompatible polymers and/or Or have a "parallel" structure. 5. The decontaminating room cleaning fabric according to claim 3, wherein both sides of the cleaning fabric have different segmental structures. 6. The purifying room cleaning fabric of claim 3 wherein said two incompatible polymers are a polyester and a polyamide. 7. Process for producing a cleansing room cleaning fabric according to one of claims 1 to 6, characterized in that the multicomponent continuous filaments are spun from the melt, stretched pneumatically and laid directly into a fiber web, if necessary A pre-reinforcement, the non-woven material is reinforced by high-pressure fluid jets and simultaneously split into fine continuous filaments with a denier of 0.1 to 1.0 dtex. 8. The method according to claim 7, characterized in that each face of the nonwoven material is impinged at least once with a high-pressure fluid jet, whereby consolidation and splitting of the multicomponent continuous filaments is achieved. 9. The method according to claim 7 or 8, characterized in that the multicomponent continuous filament is colored by dope dyeing. 10. The method according to claim 7 or 8, characterized in that two spinning beams are used, one of which produces multicomponent continuous filaments with a "pie-like" segment structure and the other produces "side-by-side" fragment structure. 11. Use of the decontaminating room cleaning fabric according to any one of claims 1 to 6, characterized in that it can be used multiple times as a wiper. 12. The application of clean room cleaning fabric according to any one of claims 1 to 6, characterized in that it meets the washability requirements of industrial clean rooms and can be applied in clean room grade 10 or higher.