Establishment of technical index system for acupuncture composite three-dimensional structural materials

During the research and development process of needle-punched composite three-dimensional structural materials, a technical index system was established at the same time. In addition to the requirements for the conventional technical indicators of the product (area density, thickness, breaking strength and elongation at break, tearing strength and bursting strength, etc.), new physical properties of the new product and new requirements in the actual application of the product are used. Testing methods and means have established a new and perfectly matched technical index system for acupuncture composite three-dimensional structural materials. For example, in the technical index system of “Yundika” leather base fabric products, the impregnation and penetration rate requirements of the base fabric and the material thickness stability requirements are converted into specific “air permeability” and “thickness change” technical indexes, and Detection methods were established. Air permeability In the leather base fabric impregnation process of wet synthetic leather production, the permeability of resin in the leather base fabric directly affects product quality and production efficiency.

During the development process of “Yundika” leather base fabric, a detection method for air permeability was established, and the measurable air permeability index of leather base fabric was used as a technical indicator to characterize the permeability of leather base fabric. According to the empirical data of actual production, the permeability requirements can be converted into air permeability >750mm/s as the technical indicator. By adjusting the ratio of raw materials and the production process of the leather base fabric, the “Yundika” leather base fabric produced has excellent air permeability indicators, which can reach 780~800mm/s. The actual production speed of the production line of the synthetic leather factory can be increased by 10% to 15% after using “Yundika” leather base fabric. Thickness changes During the production process of synthetic leather, the thickness of the leather base fabric may change due to the influence of high humidity, thus affecting the quality of the synthetic leather products.

In order to ensure the dimensional stability of “Yundika” leather base fabric in the production of synthetic leather, the technical requirements for dimensional stability were converted into specific “thickness change” technical indicators, and a detection method was established. The technical index requirement of “Yundika” leather base fabric is that the thickness change of the sample before and after boiling in boiling water is ≤0.03mm. The detection method is to mark and test the thickness on the sample, boil it in boiling water for 5 minutes, dry it naturally and then test the thickness of the marked point; compare the changes in the thickness of the sample before and after cooking, and calculate the average value and CV value. The practice of research and development of acupuncture composite three-dimensional structural materials prospect series products has proved that acupuncture composite technology is a feasible processing method for producing three-dimensional structural materials, an effective means of product development, and can be comprehensively applied in the differentiation and combination of industrial textiles. Chemical products are under development.

In the future, more products will be developed using needle-punched composite three-dimensional structural materials. The main ideas are as follows: (1) Using a reasonable combination of ultrafine fibers and fine denier fibers to design three-dimensional structural materials and develop imitation microfiber leather base fabrics. , filling the market gap between high-stretch fiber leather base fabrics and microfiber leather base fabrics. (2) Design new industrial three-dimensional structural materials, use non-woven fabrics as the carrier base material for new industrial product abrasives, and combine them with binders and abrasives of different thicknesses to form a new polishing material. (3) Design a gradient three-dimensional structure formed by fiber materials with different linear densities, and form a three-dimensional structural material with different functions on the front and back sides through double combing, double laying, and needle punching. China is already a manufacturing power, but it is by no means a manufacturing power. The development of new materials, new structures, and new products will be an eternal theme in our country during the “Twelfth Five-Year Plan” and even the “Thirteenth Five-Year Plan” period. The development of needle-punched composite three-dimensional structural materials is a better means to realize product functionalization and structural diversification. It can provide new imagination space for product design and development personnel, provide new ideas for the application and promotion of industrial textiles, and also provide enterprises with the opportunity to realize The improvement of product quality and value-added benefits have created new space. WxK56dk

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