A honeycomb structure body has an inner side base section and an outer side base section having a cylindrical shape. Inner side cells are formed in the inner side base section at a constant cell density. Outer side cells are formed in the outer side base section. A cell density of the outer side cells varies a radius direction. The outer side cells are formed on the basis of a relational equation of y=a(x−b).sup.n+c, where x is a distance on the outer side base section measured from a central point on a radial cross section, y indicates the number of the outer side cells per one cm.sup.2 at the distance x, a is a negative constant, b is a radius of the inner periphery of the outer side base section, c is the number of the inner side cells per one cm.sup.2, and n is a degree.

An energy efficient film comprising of first and second substrate layers and microstructures positioned between the first and second substrates is provided. The microstructures are positioned between the first and second structures such that a vacuum environment is created between the first and second substrates. In one embodiment, the insulating film includes a first substrate, a second substrate, and a plurality of microstructures positioned between the first substrate and the second substrate, such that a vacuum environment is created between the first and second substrates and within each microstructure cell, individually. Preferably, the plurality of microstructures is a polygonal cellular network positioned between a first transparent substrate and a second transparent substrate. A gasket may be provided on one or both of the first or second substrates. The gasket may also be provided on outer edges of the first and/or the second substrate.

A method of making an inflatable panel that includes the steps of: superimposing a second layer of a material of low gas permeability upon a first layer of a material of low gas permeability; creating a plurality of first elongated seals by intermittently sealing together the first and second layers, thereby defining a plurality of first tubes between adjacent pairs of the first elongated seals. The method also includes sealing rear ends of the first tubes; inflating the first tubes from front ends thereof with a gas; and then sealing the front ends of the first tubes, such that the gas within each of said tubes is prevented from flowing between the first tubes.

Adjoining edges of adjacent honeycomb core panel sections are mechanically interlocked. In one embodiment, the method includes forming a first edge along a first cellular core panel section. The first edge includes a first plurality of edge cell walls along the first edge. The method further includes forming a second edge along a second cellular core panel section, wherein the second edge includes a second plurality of edge cell walls along the second edge. The first edge is positioned proximate to the second edge. At least a portion of at least one of the first plurality of edge cell walls is mechanically interlocked with at least a portion of at least one of the second plurality of edge cell walls to form a joint therebetween. A composite structure may be at least partially produced by such a method.

A plugged honeycomb structure includes a honeycomb structure body, and a plurality of plugging portions, the honeycomb structure body further includes pass-through hole portions each of which is formed in at least a part of a partition wall intersection portion in which the partition walls intersect in one end face and each of which interconnects a pair of cells facing each other at a position corresponding to the partition wall intersection portion to enable pass-through of a fluid, and a value obtained by dividing a diameter of a first virtual inscribed circle inscribed at a position of a minimum hole width of the pass-through hole portion by a diameter of a second virtual inscribed circle inscribed at a position of a minimum plugging width between the plugging portions facing each other is in a range of 0.05 to 0.74.

A honeycomb core having a lattice structure which includes a resin-impregnated matrix, a method for producing such a honeycomb core, a sandwich panel having such a honeycomb core, and use of such a honeycomb core or such a sandwich panel in automobile construction. The matrix is impregnated inhomogeneously with the resin.

A method for producing a honeycomb-shaped ceramic structure by extrusion-molding a moldable material including a cordierite-forming material and a pore-forming material, wherein the cordierite-forming material contains 15-25% by mass of silica having an average particle size of 20-30 μm, with 5% or less by mass of particles having particle sizes of 10 μm or less and 5% or less by mass of particles having particle sizes of 100 μm or more, a particle size distribution deviation SD of 0.5 or less, and sphericity of 0.5 or more, and wherein the pore-forming material is present in an amount of 5-40% by mass based on the cordierite-forming material and has an average particle size of 15-50 μm, with 10% or less by mass of particles having particle sizes of 5 μm or less and 5% or less by mass of particles having particle sizes of 80 μm or more.

A medical use honeycomb structure having a plurality of through-holes extending in one direction, wherein an outer peripheral section of the medical use honeycomb structure has a through-hole groove formed by incomplete side walls of the through-hole, and a through-hole inlet adjacent to the through-hole groove.

Nanoporous three-dimensional networks of polyurethane particles, e.g., polyurethane aerogels, and methods of preparation are presented herein. Such nanoporous networks may include polyurethane particles made up of linked polyisocyanate and polyol monomers. In some cases, greater than about 95% of the linkages between the polyisocyanate monomers and the polyol monomers are urethane linkages. To prepare such networks, a mixture including polyisocyanate monomers (e.g., diisocyanates, triisocyanates), polyol monomers (diols, triols), and a solvent is provided. The polyisocyanate and polyol monomers may be aliphatic or aromatic. A polyurethane catalyst is added to the mixture causing formation of linkages between the polyisocyanate monomers and the polyol monomers. Phase separation of particles from the reaction medium can be controlled to enable formation of polyurethane networks with desirable nanomorphologies, specific surface area, and mechanical properties. Various properties of such networks of polyurethane particles (e.g., strength, stiffness, flexibility, thermal conductivity) may be tailored depending on which monomers are provided in the reaction.

A method and apparatus for forming a ribbon configured for use in forming a honeycomb structure when the ribbon is in a folded state. The ribbon comprises a first edge and a second edge. At least one portion of the first edge is not parallel to at least one portion of the second edge when the ribbon is in an unfolded state.