Laminating film Vacuum press
Heat setting (setting) is also called heat setting, plate vulcanization, thermoforming, traditional press, vacuum pressing, fast pressing, referred to as stereotypes. Heat setting is steam or dry hot air heating method to eliminate the fabric fibers in the tensile process of internal stress generated, so that a certain degree of relaxation of macromolecules, so that the shape of the braided fiber fixed to maintain its size or shape Steady process. Heat setting is a process in chemical fiber production. The purpose is to make the tension of the fiber after relaxation, is conducive to improving the fiber crystallinity and stability of various properties, reducing its boiling water shrinkage. The method is to make the fiber under the conditions of heating for a certain period of time, so that the fibers constitute the macromolecules to obtain enough activity energy, adjust the segment of the "position", so that the energy of the fiber structure tends to be the lowest. In the production of chemical fiber staple fiber, there are relaxation heat setting and tension heat setting of the points; the former is the fiber in a fully relaxed state subjected to heat setting, suitable for "wool" short fiber production; the latter in order to make the fiber at a certain tension Under the heat set, suitable for "cotton" short fiber production. one. The meaning of stereotypes
1, stereotypes: refers to a physical or chemical treatment to eliminate the accumulation of stress in the textile, strain, so that the state, size or structure to obtain a certain form of demand, and to achieve a certain degree of stability.
2, stereotypes to solve the problem:
⑴ eliminate internal stress;
⑵ improve the ability to restore deformation, to maintain the state when the shape.
Heat-setting refers to the synthetic fiber fabric under a certain tension heat treatment, to its size, shape and stability of the processing technology. Its meaning is:
① size shaping: size thermal stability, shrinkage decreased;
② flat shape: eliminate wrinkles, improve wrinkle resistance;
③ improve the performance: flexibility, feel and pilling phenomenon improved;
④ dyeing performance changes. two. Heat setting mechanism
A. The concept of stereotypes
To cause stress relaxation in the fiber and to achieve a stable form of the process.
The process of shaping is divided into two steps:
⑴ part of the macromolecule between the rapid destruction of the force;
⑵ macromolecules in the new position to quickly rebuild the new intermolecular force, and fixed down.
B. Heat setting mechanism
1, resulting in poor heat stability of synthetic fiber fabric reasons.
⑴ hidden in the process of forming the internal stress, the arrangement of macromolecules did not reach the most stable state, the heat after the thermal vibration intensified, the occurrence of bending, so that fiber retraction, smaller size.
⑵ continuous tension in the textile process, and the uneven force, exacerbated the tendency of heat retraction and retraction uneven, so that the fabric wrinkles, and difficult to remove.
2, heat setting method
That is, under the appropriate tensile tension of the fabric heat supply, so that the big re-row, and then quickly cooled, so that fiber in a more stable state of energy.
The process is divided into three phases:
⑴ macromolecule relaxation phase: when heated to the Tg above, the molecular chain between the force ↓, macromolecule rotation ↑, compliance ↑, degree of ↑, internal stress ↓.
⑵ segment reorganization stage: with the macromolecule chain thermal vibration ↑, active base encounter opportunities ↑, easy to establish a new intermolecular force, if applied to tension, macromolecules according to the direction of tension rearrangement, the establishment of a new balance.
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