摘要:
Structures containing a fiber mat inserted into a high modulus scrim of minimum basis weight 35 gsm. The structures have reduced tensile elongation at 50 N per 5 cm fabric strip in MD under ISO 9073-3standard norm. The structure has a basis weight of at least 9 ounces per square yard (305 grams per square meter ). The structure also has heat resistance of at least 150 to 190C, preferably over 200 up to 260C to for service under typical hot flue gas filtration conditions. Filter bags made from these structures provide a controlled dimensional stability over their entire filter life time. In addition such stable structures are suitable for lamination with fragile membranes especially e-PTFE membranes where minimum amount of mechanical damage to the membrane occurs.
摘要:
A method of manufacturing a flexible, impact-resistant material (i) comprises the steps of providing a sheet of a closed-cell foam material (20) and cutting the sheet (20) into a plurality of spaced elements (2). These elements (2) are substantially separated except for connecting portions (7) that connect the elements to neighbouring elements such that the elements (2) are joined to define a lattice (6). A first flexible substrate (3; 25) is bonded to one face of the lattice. The connecting portions (7) that connect the elements (2) to neighbouring elements are then removed, either with or without removing those portions of the substrate (3) bonded to the connecting portions (7), for example by punching, cutting or laser ablation. A second flexible substrate (27) may be bonded to the opposite face of the lattice either before or after removal of the connecting portions.
摘要:
The invention relates to a method of making a water repellent laminate including applying a hot melt moisture cure adhesive to a primary substrate and bonding the primary substrate with a secondary substrate that has been treated with a water repellent material prior to the lamination. The adhesive composition includes a hot melt moisture cure polyurethane prepolymer formed from a polyol component and a polyisocyanate component. The polyol component includes a first polyether polyol having a number average molecular weight of from about 500 to about 8,000, a first polyester polyol having a melting point of less than about 40°C or a second polyether polyol having a molecular weight of from about 200 to about 1,000, and a crystalline polyester polyol having a melting point of from about 4O0C to about 12O°C.