摘要:
There are disclosed a modified oriented polyacetal product, the surface of said product being coated partly or entirely with a phenolic compound-polyacetal composite layer, the application thereof and a process for preparing the same.
摘要:
An assembly (100) for the reinforcing of an article of plastic and/or rub, characterized by the following features:(a) it comprises two adjacent concentric layers (1, 2) of filaments (10, 20), the filaments (10, 20) having their axis (O.sub.1, O.sub.2) arranged, within each of the layers, substantially on a circle (C.sub.1, C.sub.2) of radius R.sub.1, R.sub.2 ; in each layer (1, 2) the filaments (10, 20) are wound in the same direction and have the same pitch (P.sub.1, P.sub.2);(b) the layers (1, 2) have the same direction of winding;(c) R.sub.1, R.sub.2, P.sub.1, P.sub.2 are in accord with the relationship:P.sub.1 >P.sub.2 >P.sub.1 .times.[1-2(R.sub.2 -R.sub.1)/R.sub.2 ].Articles reinforced by such assemblies, for instance pneumatic tires.
摘要:
Disclosed is a polyethylene terephthalate untwisted multifilament which satisfies the following requirements (A), (B), (C) and (D);(A) the intrinsic viscosity [IV] is 0.97 to 1.15;(B) the amorphous orientation function [fa] is not larger than 0.55;(C) the tenacity [T] (g/d), the shrinkage [.DELTA.S] (%) as measured after standing in dry air at 150.degree. C. for 30 minutes, the medium elongation [ME] (%) under a load of 4.5 g/d, and the dimensional stability index [Y] expressed by the formula: Y=ME.sup.0.81 +.DELTA.S+1.32 are within ranges defined by the following formulae (a), (b), (c), (d) and (e):0.33Y+5.55.ltoreq.T.ltoreq.0.33Y+6.50 (a),8.0.ltoreq.T.ltoreq.9.5 (b),8.5.ltoreq.Y.ltoreq.10.5 (c),5.ltoreq.ME.ltoreq.10 (d), and2.ltoreq..DELTA.S.ltoreq.g (e);and (d) the elongation at break is at least 11% and the product of the tenacity and elongation, which is defined by: ##EQU1## is 30 to 36.
摘要:
A heavy duty radial tire comprises a tread portion, a pair of sidewall portions, a pair of bead portions, a carcass of at least two plies and a breaker, wherein each ply is composed of cords of aromatic copolyamide fiber having particular units A and B and a specific rubber composition having 100% modulus of 35-50 kg/cm.sup.2.
摘要翻译:重型子午线轮胎包括胎面部分,一对侧壁部分,一对胎圈部分,至少两个帘布层的胎体和破碎机,其中每个帘布层由具有特定单元A和B的芳族共聚酰胺纤维的帘线构成 和100%模量为35-50kg / cm 2的特定橡胶组合物。
摘要:
Strand for application as reinforcement in objects of polymer material comprising at least one core and less than six outside wires arranged round it, the core having an outside diameter larger than the diameter of the circle tangent to each of the outside wires in the hollow space that remains free when their cross-sections have the highest packing density and smaller than the diameter of the outside wires, whereby the outside wires are made of carbon steel wire with a tensile strength of at least 2250-1130 log d N/mm.sup.2, d being the wire diameter in mm.
摘要:
Reinforcing layers for bias tires comprising a laminated structure of a steel cord ply and composite cord plies made of aramid yarns and nylon yarns, said composite cord plies being disposed radially outwardly of the steel cord ply maintaining a full space between steel cords and composite cords and a nominal total denier of said composite cords being in the range of 4,000-10,000.
摘要:
A pneumatic tire has a carcass which is formed, at least in part, of a regenerated cellulose fiber. The fiber is formed of at least one filament having a base of cellulose and/or at least one cellulose derivative containing cellulose ester groups, at least a part of these ester groups being formate groups.
摘要:
High strength polyester multifilament yarn of improved dimensional stability, which has the proper combination of an intrinsic viscosity of at least 0.90, relatively low work loss and a high degree of toughness, is incorporated as tire cord into a rubber tire for reinforcement to provide an important improvement in fatigue life and retained fatigue strength. The continuous melt-spin process comprises the steps of feeding prepolymer to a first finisher vessel to achieve at least 0.4 intrinsic viscosity transferring polymer to a second finisher vessel for a period sufficient to achieve an intrinsic viscosity of at least 0.95, and supplying this polymer to an extrusion spinnerette.
摘要:
Manufacture of a multifilament polyester yarn which is suitable for use as an industrial yarn, particularly tire yarn, and displays a specific breaking strength at high spinning speeds, the yarn is made in accordance with a process comprising the successive steps of spinning a molten polymer through a plurality of holes, cooling and drawing the resulting filaments, and finally collecting them, the polymer flow in each of the spinneret holes exhibits a core portion having a higher relative viscosity and a sheath portion having a lower relative viscosity, the difference between said relative viscosities amounting to less than 0.100, preferably 0.040-0.003.