Described herein are details for designing and manufacturing enhanced shock and impact resistant helicoidal lay-ups by combining nanomaterials, variable pitch and partial spirals, Thin unidirectional fiber plies, hybrid materials, and/or curved fibers within a ply. The helicoidal structures created in the prescribed manners can be tuned and pitched to desired wavelengths to dampen propagating shock waves initiated by ballistics, strike forces or foreign material impacts and can arrest the propagation of fractures including catastrophic fractures. These enhancements open the helicoidal technology up for use in such applications as consumer products, protective armor, sporting equipment, crash protection devices, wind turbine blades, cryogenic tanks, pressure vessels, battery casings, automotive/aerospace components, construction materials, and other composite products.

Described herein are details for designing and manufacturing enhanced shock and impact resistant helicoidal lay-ups by combining nanomaterials, variable pitch and partial spirals, Thin unidirectional fiber plies, hybrid materials, and/or curved fibers within a ply. The helicoidal structures created in the prescribed manners can be tuned and pitched to desired wavelengths to dampen propagating shock waves initiated by ballistics, strike forces or foreign material impacts and can arrest the propagation of fractures including catastrophic fractures. These enhancements open the helicoidal technology up for use in such applications as consumer products, protective armor, sporting equipment, crash protection devices, wind turbine blades, cryogenic tanks, pressure vessels, battery casings, automotive/aerospace components, construction materials, and other composite products.

The invention provides a biaxially-oriented polypropylene film that contains a base layer (A) comprising a polypropylene resin as a main component, a surface layer (B) provided at one side of the base layer (A), and a surface layer (C) provided at one side of the base layer (A) opposite to the surface layer (B), wherein the surface layer (B) has a wetting tension of 38 mN or more, a surface resistance value of 14.0 LogΩ or more, an arithmetic average roughness (Ra) of 3.0-5.5 nm, a Martens hardness of 248 N/mm.sup.2 or less, and a center plane average surface roughness (SRa) of 0.010-0.026 .Math.m, and the surface layer (C) has a center plane average surface roughness (SRa) of 0.020 .Math.m or more and a Martens hardness of 270 N/mm.sup.2 or more.

The invention provides a biaxially-oriented polypropylene film that contains a base layer (A) comprising a polypropylene resin as a main component, a surface layer (B) provided at one side of the base layer (A), and a surface layer (C) provided at one side of the base layer (A) opposite to the surface layer (B), wherein the surface layer (B) has a wetting tension of 38 mN or more, a surface resistance value of 14.0 LogΩ or more, an arithmetic average roughness (Ra) of 3.0-5.5 nm, a Martens hardness of 248 N/mm.sup.2 or less, and a center plane average surface roughness (SRa) of 0.010-0.026 .Math.m, and the surface layer (C) has a center plane average surface roughness (SRa) of 0.020 .Math.m or more and a Martens hardness of 270 N/mm.sup.2 or more.

The invention relates to a tube including at least one layer formed of polytetrafluoroethylene, and an object of the invention is to provide a tube in which flexibility is adjusted while high mechanical strength is maintained. The object can be appropriately achieved by a tube including at least one layer formed by spirally winding a PTFE film, in which the tube has an endothermic peak in a range of 380° C.±10° C. in a temperature increasing process of DSC of the tube, and in at least one of the at least one layer, the number of windings per length of 10 mm in a longitudinal direction is not constant.

A panel for a shielding cabin having a base plate made of a non-magnetic material and at least one sheet layer made of a soft magnetic material is provided. The base plate is stuck to at least one sheet layer by a viscoelastic adhesive. The adhesive has a glass transition temperature of −80° C. to −60° C.

The present invention relates to a film comprising one or more layers, wherein at least one layer consists of a polymer formulation (A) comprising: (c) ≥60.0 and ≤90.0 wt % of a linear low-density polyethylene; and (d) ≥10.0 and ≤40.0 wt % of a high-density polyethylene with regard to the total weight of that layer of the film, wherein the film is a bi-directionally oriented film wherein the orientation is introduced in the solid state. Such film has improved tensile properties, such as demonstrated by improved tensile modulus in both machine direction as well as in transverse direction, and improved tensile strength, also in both machine direction and in transverse direction. Such film also has desirable optical properties and impact properties, and has good thermal resilience. Furthermore, by that components (a) and (b) are both polymers of the polyethylene family, the film has good recyclability properties.

The present invention relates to a film comprising one or more layers, wherein at least one layer consists of a polymer formulation (A) comprising: (c) ≥60.0 and ≤90.0 wt % of a linear low-density polyethylene; and (d) ≥10.0 and ≤40.0 wt % of a high-density polyethylene with regard to the total weight of that layer of the film, wherein the film is a bi-directionally oriented film wherein the orientation is introduced in the solid state. Such film has improved tensile properties, such as demonstrated by improved tensile modulus in both machine direction as well as in transverse direction, and improved tensile strength, also in both machine direction and in transverse direction. Such film also has desirable optical properties and impact properties, and has good thermal resilience. Furthermore, by that components (a) and (b) are both polymers of the polyethylene family, the film has good recyclability properties.

A surface-reinforced bitumen roofing membrane includes at least two layers, namely 1) a bitumen compound layer, and 2) a fiber mat, and can optionally include a) an optional bleed blocker layer that is located between the bitumen compound layer and the fiber mat, b) an optional liquid applied coating that partially or fully encapsulates the fiber mat, c) an optional release liner that is releasably positioned on the bottom surface of the bitumen roofing membrane, and/or d) an optional release film that is releasably positioned on the fiber mat surface.

A surface-reinforced bitumen roofing membrane includes at least two layers, namely 1) a bitumen compound layer, and 2) a fiber mat, and can optionally include a) an optional bleed blocker layer that is located between the bitumen compound layer and the fiber mat, b) an optional liquid applied coating that partially or fully encapsulates the fiber mat, c) an optional release liner that is releasably positioned on the bottom surface of the bitumen roofing membrane, and/or d) an optional release film that is releasably positioned on the fiber mat surface.