（1） Overview:
The non-woven fabric technology of water jet reinforcement (also known as hydraulic jetting method, hydraulic entanglement method, etc.) started relatively late. It was successfully developed by American companies Dupont and Chicopee in the mid-1970s and achieved industrial production in 1985.
The water jet method of non-woven materials has good moisture absorption and breathability, soft texture, high strength, good drapability, no need for adhesive reinforcement, and its appearance is closer to traditional textiles than other non-woven materials. Therefore, although the water jet process developed relatively late, it has become one of the fastest-growing non-woven process methods. Both products, processes, and equipment have been greatly developed in recent decades. The application of water jet technology has also been transplanted to the fields of spunbond nonwoven materials, woven fabrics, knitted fabrics, and pulp and meal materials.
（2） The principle of reinforcing fiber mesh with water jet grouting method
The principle of using water needling to reinforce the fiber mesh is similar to that of needle needling, but it does not require a needle. Instead, it uses multiple micro water jets generated by high pressure to spray the fiber mesh, commonly known as "high-pressure water needles". After the water needle passes through the fiber mesh, it is entrusted to hold the rebound of the mesh curtain and insert the fiber mesh again. As a result, under the hydraulic action of high-speed water needle insertion in different directions, the fibers in the fiber mesh produce displacement, insertion, entanglement, and hugging, thereby reinforcing the fiber mesh.
（3） Technical characteristics of water jet grouting method for reinforcing fiber mesh
① Flexible entanglement, does not affect the original characteristics of the fibers, and does not damage the fibers
② The appearance is closer to traditional textiles than other non-woven materials
③ High strength and low fuzzing
④ High moisture absorption and rapid moisture absorption
⑤ Good breathability
⑥ Soft texture and good drape
⑦ The appearance is diverse and diverse
⑧ No need for adhesive reinforcement, washable
⑨ Long production process and large footprint
⑩ Complex equipment and high water quality requirements
（4） Product application
The use of non-woven materials by the water jet method includes medical curtains, surgical gowns, surgical masks, medical dressing materials, wound dressings, medical gauze, aviation cleaning cloths, clothing lining substrates, coating substrates, disposable materials, advanced cleaning cloths for instruments and meters, advanced cleaning cloths in the electronics industry, towels, makeup cotton, wet wipes, mask wrapping materials, etc.
（5） Spinning process
A. Preparation of fiber raw materials → loosening and mixing → combing into a mesh → cross laying the mesh → pre wetting → front and back water puncture reinforcement → dehydration (water treatment cycle) → pre drying → post finishing → drying and shaping → cutting and winding → packaging
B. Preparation of fiber raw materials ->loosening and mixing ->sorting and forming a disorderly web ->pre wetting ->front and back water needling reinforcement ->dehydration (water treatment cycle) ->pre drying ->post finishing ->drying and shaping ->cutting and winding ->packaging
Different mesh forming methods affect the longitudinal and transverse strength ratio of the final product. Process A has a better adjustment of the longitudinal and transverse strength ratio of the fiber mesh, which is suitable for the production of water jet synthetic leather substrates; Process B is suitable for the production of water jet sanitary materials.