What is the specific production process of 99.99% POLYESTER FITTED SHEET PROTECTOR?

1. Raw material preparation
High-quality polyester chips are used as raw materials. Polyester chips are the basic materials for polyester fiber production. Its purity directly affects the quality of the final product. For 99.99% polyester fiber mattress protector, the purity of raw materials is crucial. The raw materials must undergo strict screening, purification and drying before being put into production to ensure that there are no impurities and low moisture content, so as to ensure the smooth progress of the spinning process and the stability of fiber quality.

2. Spinning process
Melt spinning: The processed polyester chips are sent into the screw extruder for heating and melting. The temperature is usually controlled between 265-270℃. The molten polyester melt is accurately measured by the metering pump and enters the spinning box. It is then extruded into filaments through the small holes of the spinneret.
Cooling and stretching: The extruded polyester filaments are rapidly cooled and solidified in the spinning tunnel to form primary fibers. The primary fibers undergo multi-stage stretching and heat treatment to improve the strength and elasticity of the fibers and form the final required polyester fiber filaments.

3. Weaving and cutting
Weaving: Feed the polyester filament into the loom and weave it using appropriate weaving techniques (such as plain weave, twill, etc.) according to the size and design requirements of the fitted sheet protector. During the weaving process, the density of the fabric, the tension in the warp and weft directions and other parameters must be strictly controlled to ensure the flatness and durability of the fabric.
Cutting: After the woven cloth has passed the inspection, it is cut according to the size specifications of the fitted sheet protector. During the cutting process, it is necessary to ensure that the edges are neat and the size is accurate for subsequent sewing.

4. Sewing and packaging
Sewing: After the cut pieces of cloth are pre-shrunk, they enter the sewing process. During the sewing process, professional sewing equipment and technology are used to sew the pieces of cloth into a fitted sheet protector with elastic edges. When sewing, attention should be paid to fine stitches and uniform stitches to ensure the beauty and durability of the product.
Quality inspection and packaging: The sewn fitted sheet protector must undergo strict quality inspection, including size inspection, sewing quality inspection, elasticity test, etc. After passing the inspection, the products will be packaged, usually in dust-proof bags or transparent bags, for easy transportation and sales.