Abstract: A bridge of shock-absorbing construction is disclosed, which includes horizontal members arranged in series, vertical members supporting the horizontal members, and connectors for connecting the adjacent horizontal members or for connecting the horizontal member and the vertical member, wherein shock absorbers formed from a material with an elastic modulus in flexure over 200 kgf/cm2 and each having a wall structure in a shock-loading direction are disposed on the connectors or at the points of contact between the horizontal members or between the horizontal member and the vertical member.

Abstract: A resin impact absorber comprising a hollow columnar body having a honeycomb section or a hollow columnar body having a cylindrical shape, the hollow columnar body being made of a resin with a flexural modulus of 500 to 5000 kgf/cm.sup.2, wherein a reaction-compressibility curve at the time of compression in the lengthwise direction of the columnar body satisfies the following conditions: (a) yield strength.gtoreq.100 Tf/m.sup.2 and (b) compression energy absorption.gtoreq.50 Tf.m/m.sup.3. The resin impact absorber of the present invention is small in size and light in weight and exhibits a high impact energy absorption capacity. A site or structure with an impact absorber of the present invention disposed therein can be prevented from remarkable damage or breakage when it receives a high impact force.

Abstract: A thermo-shrinkable polyester film of this invention is obtained from a composition that comprises acid components including terephthalic acid and glycol components including ethyleneglycol. The polyester film has a heat-shrinkage ratio of 30% or more in a certain direction at 100.degree. C., and a shrinkage ratio of 5% or more at the point of intersection of a curve showing the internal shrinkage stress of the film and a curve showing the tensile stress of the film.

Abstract: An oriented polyester film having at least one surface being roughened by containing inactive particles and three-dimensional surface roughness exponents of the said roughened surface are within ranges simultaneously satisfying the following relationships (I) to (III), while the number of coarse projections is in excess of the fourth grade:0.014.ltoreq.S.DELTA.a.ltoreq.0.025 (I)5.2.ltoreq.S.lambda.a.ltoreq.13.0 (II)0.012.ltoreq.SRa.ltoreq.0.050 (III)where S.DELTA.a represents three-dimensional average gradient, S.lambda.a represents the spatial average wavelength (.mu.m) of three-dimensional surface roughness and SRa represents three-dimensional central plane average roughness (.mu.m).

Abstract: An oriented polyester film comprising ethylene terephthalate as the major repeating units, which comprises 0.01 to 1.0% by weight of silica particles and/or titanium dioxide particles having each an average particle size of 0.01 to 0.5.mu. and 0.005 to 1.0% by weight of calcium carbonate having an average particle size of 0.01 to 0.5.mu., which provides an oriented polyester film for the base film of video tape which has a flatness on the surface and has excellent slipperiness, abrasion resistance and running characteristics as well as excellent magnetic transducer characteristics.

Abstract: An oriented polyester film comprising ethylene terephthalate as the major repeating unit, which comprises particles of kaolinite and calcium carbonate uniformly dispersed therein, said kaolinite and said calcium carbonate having each an average particle size of 0.05 to 0.8 micron and being contained in such amounts as satisfying the following equations:70.ltoreq.D.times.A.ltoreq.1000 (I)1000.ltoreq.A+B.ltoreq.10000 (II)0.1.ltoreq.B/A.ltoreq.25 (III)wherein D is an average particle size (micron) of calcium carbonate, A is a content (ppm) of calcium carbonate and B is a content (ppm) of kaolinite, said oriented polyester film being excellent in flatness, slipperiness, abrasion resistance, etc. with a small number of coarse particles.