摘要:
PLA polymers that can be expanded into microporous articles having a node and fibril microstructure are provided. The fibri!s contain PLA polymer chains oriented with the fibril axis. Additionally, the PLA polymers have an inherent viscosity greater than about 3.8 dL/g and a calculated molecular weight greater than about 150,000 g/mol. The PLA polymer article may be formed by bulk polymerization where the PLA bulk polymer is made into a preform that is subsequently expanded at temperatures above the glass transition temperature and below the melting point of the PLA polymer. In an alternate embodiment, a PLA polymer powder is lubricated, the lubricated polymer is subjected to pressure and compression to form a preform, and the preform is expanded to form a microporous article. Both the preform and the microporous article are formed at temperatures above the glass transition temperature and below the melting point of the PLA polymer.
摘要:
To provide a foamed phenol resin body laminate, which has excellent surface flatness, improved bending elasticity modulus in the longitudinal direction and bending strength, and improved flexibility, and its appropriate manufacturing method.
摘要:
A sectional door (20) having a plurality of panels (21, 22, 23, 24), one of the edges (40) between adjacent pannels on a first panel having a substantially concave curvilinear surface (45) the other of the edges (50) having a planar surface (52). The hinges include a first hinge element (66) having a first leaf (67), a cylindrical first knuckle (72) at one edge of the first leaf, a through slot (73) proximate the first knuckle and a second hinge element (80) having a second leaf (85), a cylindrical second knuckle (81) at one edge of the second hinge element extending into the through slot and rotatable about the first knuckle. A panel (22) for sectional door (20) having a foam core (140, 240, 340), an inner surface (145, 245, 345) and a recess (150, 250, 350) in the inner surface and the foam core extending the longitudinal length of the foam core. A bracket assembly (110) for the bottom (35) of the door including, an L-shaped plate (111), a sleeve (120) for receiving a shaft (121) mounting one of the rollers (122), fasteners (115) for attaching the L-shaped plate to the lower panel and cut-outs (125) in the cylindrical sleeve positioned substantially above the fasteners whereby the fasteners may be removed only when the shaft is not positioned in the cylindrical sleeve. Conveyor apparatus (400, 500) for the continuous production of foam-cored door panel material (22') a second conveyor (402, 502) having panel engaging surfaces (451, 464, 535, 540) for engaging spaced skin surface (150).
摘要:
A system for continuous manufacture of building elements consisting of a self-supporting framework of tightly compressed solid particles and a foaming material in the shape of a foamed plastic material, comprises a filling station where mould bottoms are placed in continuation of each other on a roller conveyor, assembled with sidewalls and passed along a guide section (8), wherein particle-shaped filler is supplied from a silo (9) while a premixed foam material is injected into the material through nozzle tubes (12), and the components are mixed before being injected into the mould and compressed. After placing of a top wall on each of the moulds, these are passed under a roller conveyor (3), and while the moulds are moved ahead between the roller conveyors (1) and (3) and possibly between roller conveyors outside the side, the foam material cements the particles together to a monolithic unit which will set before the moulds leave the roller conveyors (1, 3). After demoulding of the formed flow of material, this is cut by a cutting mechanism G into required lengths, and the moulds are carried back to the filling station.
摘要:
A technique for initiating the formation of pores in a polymeric material that contains a thermoplastic composition is provided. The thermoplastic composition contains microinclusion and nanoinclusion additives dispersed within a continuous phase that includes a matrix polymer. To initiate pore formation, the polymeric material is mechanically drawn (e.g., bending, stretching, twisting, etc.) to impart energy to the interface of the continuous phase and inclusion additives, which enables the inclusion additives to separate from the interface to create the porous network. The material is also drawn in a solid state in the sense that it is kept at a temperature below the melting temperature of the matrix polymer.
摘要:
An apparatus for continuous production of insulating and draining boards, comprising a conveyor arrangement for conveying a mixture of beads of foamed plastic and a binder agent from an input end to an output end of the conveyor arrangement, the conveyor arrangement comprising an endless bottom conveyor belt and an endless top conveyor belt, the top conveyor belt being arranged above the bottom conveyor belt and defining therewith a conveyor path for conveying the mixture, and a drying unit for creating a drying environment, wherein the bottom conveyor belt and the top conveyor belt are arranged such that a first part of the conveyor path forms a compacting section for compacting a mixture of beads of foamed plastic and a binder agent, and wherein the drying unit is arranged to create a drying environment in a drying section of the conveyor path extending along a second part of the conveyor path arranged downstream of the first part, the drying section being arranged for drying the compacted mixture of beads of foamed plastic and binder agent.
摘要:
A continuously extruded non-crosslinked polyolefin foam comprising a) a blend of a base resin such as low density polyethylene (LDPE) and a modifier resin b) a permeability modifier and c) a nucleator, and a process of manufacturing the foam.
摘要:
This invention has an object thereof to provide a method for producing an HIPE polymer which can prevent the HIPE from leaking, allow the formed HIPE including the opposite end parts thereof to acquire and retain an expected thickness, prevent the formed HIPE from failing to polymerize due to a decrease in an oxygen content, and allow the formed HIPE to retain a sheet such as an upper film. Such an object of this invention can be accomplished by a method for the production of a porous cross-linked polymer by the horizontal continuous polymerization of an HIPE, which comprises using weirs one each in the opposite end parts in the width direction of an HIPE supporting member to be used for the horizontal continuous polymerization of the HIPE.
摘要:
Methods and apparatus for continuously forming thin-gauge flexible foam sheeting by controlling the rise of an expanding foam-forming mixture (3) until the reaction is substantially complete. The foam-forming mixture is cast onto a continuously conveyed first facing material (31), after which a second facing material (32) is applied to the foam-forming mixture, forming a sandwich. Dispersing means (33) squeeze the sandwich and evenly distribute the mixture between facing sheets. Rise of the foam is controlled by maintaining a gap between a multiplicity of pairs of upper rollers (42) and lower rollers (43).