Tubular nonwoven compound material and manufacturing method thereof

Abstract

The invention relates to a tube shaped composite material non-woven fabric and method of producing the same, the composite material is made by tubular opposite joint of non-woven fabric base fabric and coating layer on it in width direction, the composite material is used for non-digging repair of damaged pipeline burred in city, the invention is characterized in that the base fabric of the composite material is made by opposite joint stitch of 2 or more than 2 same no-woven fabric base fabric in width direction, and is stitched into tubular non-woven fabric base fabric, and integral thickness of the coating layer on the same is uniformly consistent. The production method includes techniques: 1 designing split joint block number of the non-woven fabric base fabric; 2 remaining joining edge on both sides of each non-woven fabric base fabric in width direction, and homogeneously coating resin on other place; 3 using joining edge to oppositely joint the non-woven fabric base fabric with designed block number into tubular shape; 4 executing complement resin process at joining place and uniforming the thickness of resin at joining place of plane opposite joint and coated resin at other place, thereby obtaining the tube shaped non-woven fabric composite material.

Description

technical field [0001] The invention relates to a textile composite material manufacturing technology, specifically a tubular nonwoven composite material used in the non-excavation repair technology of urban buried damaged pipelines and its manufacturing method. The international patent classification number is proposed to be Int.Cl.F16L 55 / 162 (2006.01). Background technique [0002] Various pipelines buried in the city are often damaged. The usual way to repair such damaged pipes is to dig up the pavement, repair or replace the damaged pipe, and then refill the pavement. This restoration construction method has many procedures, long construction period, high cost, damages the road surface, blocks traffic, and wastes resources. Trenchless relining technology is a new technology for repairing damaged urban buried pipelines. This technology does not need to fully excavate the road surface, and avoids the inherent problems of conventional methods such as traffic obstruction...

AI Technical Summary

Problems solved by technology

Stitched tubular non-woven composite material 1, in order to prevent leakage, its seam C is lap-stitched, and its thickness is twice that of other parts, although the strength of seam C is acceptable (actually the seam C is stitched The thread bears concentrated stress and is easy to break when the lining is turned over), but because the sewing needle not only needs to pierce the soft non-woven fabric 11, but also pierce the harder film (resin) layer 12 during sewing, which makes the sewing more difficult. The sewing efficiency is not high, and many sewing needle holes will be produced at the seam C at the same time D

These needle holes D, especially during the lining construction, will be deformed and expanded under tension, leaving hidden dangers of leakage (see image 3 ) and affect the sealing, and generally fail to meet the requirements of the composite material's air permeability resistance, water permeability resistance and mechanical properties when turning over the lining

The tubular non-woven fabric composite material 1 bonded by thermocompression, the lap joint E must be double-layer base fabric 11 and coating layer 12, and the thickness is also twice that of other parts. After thermocompression, its thickness is also much thicker than Other parts (see Figure 4 ), and use the hot-melt bonding effect of the overlapping interface coating layer 12 to bond into a tubular shape, the interlayer strength and joint strength of its multi-layer structure cannot be guaranteed, and it is easy to crack during lining construction

More importantly, the current tubular nonwoven composite material 1, no matter what kind of butt joint method, is made of a piece of nonwoven fabric and a seam in a tubular form. In the actual application of repairing pipelines, often It will cause the "turning head" B of the non-woven fabric composite material 1 to be unstable in the movement of the lining construction machinery, and a large stress concentration will be generated at the seam, which is easy to crack or deform unevenly, resulting in the sealing of the tubular non-woven fabric composite material 1 and anti-seepage performance decrease, so that the effect of repairing the damaged pipeline 2 liner is reduced, and even the repair construction fails

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