7 results about "Draw ratio" patented technology

The present invention relates to: a polyester-based composite false-twisted yarn in which a PET / PTT latent crimped yarn is used as a core yarn, and a partially oriented yarn is loosely arranged on the exterior as an effect yarn by minimizing the draw ratio during the manufacture of the composite false-twisted yarn; and a method for manufacturing same. The polyester-based composite false-twisted yarn of the present invention has improved elasticity due to waves of the core yarn, compared to conventional composite false-twisted yarns, and can provide the effect of improving touch feel due to waves of the effect yarn.

Methods and (articles of manufacture therefrom) including forming an elastic film from a polymer composition; tensioning the elastic film to a stretch ratio of between 2 and 6 in the MD; laminating the elastic film to an extensible facing to provide an elastomeric laminate having a CD hysteresis loss of 70% or less and an MD hysteresis loss of 50% or less.

This invention belongs to the field of ultra-high molecular weight polyethylene (UHMWPE) fiber preparation technology, and discloses an UHMWPE fiber, its drawing method, and a preparation apparatus. The drawing method includes: performing multi-stage continuous drawing on UHMWPE gel filaments prepared using a dry-wet method to obtain UHMWPE fibers; wherein the multi-stage continuous drawing includes pre-drawing and hot drawing; the initial feed speed of the UHMWPE gel filaments entering the pre-drawing stage is 1.5-4 m / min, and the total draw ratio is 2-15 times. The UHMWPE fibers prepared using the method of this invention have excellent mechanical properties, low coefficient of variation, adjustable fineness, and can improve production capacity.

A method of forming an article, the method comprising: (a) providing a mould having a first mould part and a second mould part, the first and second mould parts having respective first and second cavity-forming surfaces; (b) closing the mould thereby defining a cavity between the first and second cavity-forming surfaces; (c) injecting a molten plastic composition comprising a polymer and a physical blowing agent into the cavity, wherein during or after the injecting step (c), the injected plastic composition in contact with the first and second cavity- forming surfaces is cooled to form first and second solid skins respectively adjacent to and in contact with the first and second cavity-forming surfaces, whereby in at least one region of the cavity is respectively located at least one portion of the plastic composition in which portion at least some of the plastic composition between the first and second solid skins remains molten, wherein the thickness of the respective portion is constant within a tolerance of + / - 0.5%, preferably + / - 0.2%, based on a nominal thickness of the respective portion; (d) opening the mould before the molten plastic composition between the first and second solid skins has solidified in the at least one portion, so as to expose the molten plastic composition of the respective portion to an external pressure lower than the injection pressure thereby allowing the molten plastic composition between the first and second solid skins of the respective portion to expand by foaming to form an expanded cellular foam as a result of the molten plastic composition beneath the first solid skin expanding outwardly away from the second solid skin which stretches the first solid skin in the respective portion, wherein the opening step comprises removing the first mould part so that the first solid skin is no longer in contact with the first cavity-forming surface; and (e) cooling the expanded cellular foam to cause the molten plastic composition between the first and second solid skins of the respective portion to solidify and to form in the article at least one first part comprising a core layer of cellular foam between the first and second solid skins, wherein after the cooling step (e) the length of the first solid skin in the respective portion has stretched, as compared to the first solid skin present prior to the opening step (d), by a stretch ratio of from 0.5 to up to 3%, wherein the stretch ratio is the ratio of the increase in the length of the first solid skin after cooling step (e) based on length of the first solid skin before the opening step (d).

The present invention provides a composite fiber that can be processed into a fibrous structure having good flexibility and bulkiness, a method for manufacturing the same, and a fibrous structure containing the same. [Solution] This invention relates to a composite fiber comprising a first component containing poly-L-lactic acid with an optical purity of 95% or more, and a second component containing an aliphatic polyester composed of glycol and dicarboxylic acid, wherein, in a DSC curve obtained by differential scanning calorimetry (DSC), the crystallization temperature of the second component during the cooling process is 78°C or higher, and the heat of fusion per unit mass of the second component during the second heating process is 73.5 mJ / mg or less. The composite fiber can be manufactured by melt-spinning the first component at a lower temperature than the second component, and then stretching it at a temperature of 55°C to 90°C and a stretch ratio of 1.4 times or more. This makes it possible to provide a composite fiber that can be processed into a fiber structure having good flexibility and bulkiness, a method for manufacturing the same, and a fiber structure containing the same.

The application discloses a kind of multi-factor multi-scale mechanical property determination method and system of high molecular shock absorber, the method according to the relationship of energy storage modulus of high molecular material and arbitrary strain amplitude, the difference of arbitrary strain and infinite strain amplitude, the difference of characteristic strain and infinite strain amplitude and the force-displacement relationship of single molecular chain, the force-displacement relationship of single molecular chain under energy storage modulus and loss modulus is obtained;In the relationship between the micro-molecular chain stress of high molecular material and the tensile ratio, load in the principal axis direction is introduced, shear stress and shear modulus are obtained, according to the principal stress, shear stress and shear modulus of high molecular material, the macro-scale model of high molecular rubber-based material is constructed, and temperature correlation is introduced to form a multi-scale refinement model, which can accurately describe the influence of frequency, temperature, displacement amplitude and microstructure on the multi-scale mechanical properties of high molecular rubber-based damper, and provide a theoretical basis for multi-scale design and development of high-damping damper.

The present application provides a method for manufacturing a laminate, which can stably manufacture a laminate including a coating layer having a desired thickness. A method for manufacturing a laminate according to one embodiment includes: a coating step of coating a coating agent on a substrate being conveyed using a coating roll to form a coating layer on the substrate, the coating agent being coated on the substrate based on a ratio of a rotation speed of the coating roll to a conveyance speed of the substrate, i.e., a coating draw ratio; a thickness acquisition step of acquiring a thickness of the coating layer; a calculation step of calculating a difference between the thickness of the coating layer and a prescribed thickness; and a change step of changing the coating draw ratio in the coating step based on the difference between the thickness of the coating layer and the prescribed thickness, the coating step, the thickness acquisition step, the calculation step, and the change step being repeatedly performed while automatically implementing the coating step, the thickness acquisition step, the calculation step, and the change step.