摘要:
An extrusion system utilizes single (30) or tandem extruders (102) and (103) and a mixer-cooler (104) to extrude a foamable extrudate through a die (37) in a sealable chamber. The foamable extrudate is shaped and calibrated within the chamber. The die (37) is mounted on the end of a gel tube (120) projecting through a gland seal in a fixed bulkhead (36) forming the upstream end of the chamber (40). The gel tube (120) and mixer-cooler (104) are mounted on a movable carriage, movement of which may be used to adjust the die (37) with respect to the shaping and calibrating equipment inside the chamber. The mixer-cooler (104) achieves a selected narrow range of uniform viscosity of the melt at the die (37) depending on the size of the product and density. The mixer-cooler (104) enables a large size low density product to be produced with uniform cellular structure without collapse or density gradients, as the product is subjected to pressure and temperature transformations passing from the chamber to atmosphere through the water.
摘要:
A horizontal vacuum extrusion line includes a fixed bulkhead (23), a die (24) inside the bulkhead, a telescoping vacuum chamber section (27) and a fixed chamber section (28, 29). A dam (33) in the fixed section forms a pond (72) for immersion cooling of the extrudate. A truss (35) extends from the dam to the bulkhead supporting, shaping and calibration equipment and extends through the telescoping section. Fluid pressurizable seals at each end of the telescoping section are operable after the telescoping section is closed against the bulkhead and the telescoping and fixed sections are locked together. The telescoping section provides a more compact line and easier access to the complex equipment downstream of the die. The extrudate from the die passes down into the pond (72) and then through an orifice (74) in a hood (75) projecting from the chamber into a lower level portion of the pond (78) exposed to atmosphere. The hood also includes a tractor drive (88) to push the extrudate through the underwater orifice. The hood and its contents are accessible through the atmospheric pond. A tractor haul-off and the tractor drive in the hood are the only extrudate drives between the calibration equipment and atmosphere. The higher level of the pond (72) within the chamber downstream of the dam is controlled by a valve in turn controlling the output of a pump. The valve control senses the pond level and operates independently of the vacuum controls.
摘要:
A method of molding a sole (6) in vulcanized foam rubber for footwear, comprising the phases of preparing a rubber in the form of strip, preformed and/or granules, mixing said rubber inside a loading and mixing chamber (10), preparing a mold (4) for the molding of a footwear sole (6), said mold (4) defining a molding chamber (8) counter-shaped with respect to a footwear sole (6), conveying the mixed material inside said molding chamber (8) and molding the footwear sole (6) inside the molding chamber (8), removing the footwear sole (6) from said mold (4). Advantageously, the rubber comprises a foaming agent able to generate an expansion of the material inside the molding chamber (8) during molding, so as to uniformly fill said molding chamber (8) with the foam rubber; furthermore, the method comprises the phase of vulcanization of the foam material inside the molding chamber (8).
摘要:
An extrusion system utilizes single (30) or tandem extruders (102 and 103) and a mixer-cooler (104) to extrude a foamable extrudate through a die (37) in a sealable chamber. The foamable extrudate is shaped and calibrated within the chamber (40). The product exits the chamber to atmosphere on a continuous basis through a submerged orifice in a water baffle immersion seal. The seal includes the submerged orifice with a free wheeling guiding system upstream of the orifice. Immediately ahead of the guiding system, the parameters of the foam extrudate are sensed to control the configuration of the orifice on a continuous basis. Before the extrudate passes into the water baffle seal it moves over a floating dancer roll (65), the position of which controls a haul-off such as a vacuum belt, at the tail end of the system. This avoids pushing on the extrudate.
摘要:
An extrusion system utilizes single (30) or tandem extruders (102 and 103) and a mixer-cooler (104) to extrude a foamable extrudate through a die (37) in a sealable chamber. The foamable extrudate is shaped and calibrated within the chamber (40). The product exits the chamber to atmosphere on a continuous basis through a submerged orifice in a water baffle immersion seal. The seal includes the submerged orifice with a free wheeling guiding system upstream of the orifice. Immediately ahead of the guiding system, the parameters of the foam extrudate are sensed to control the configuration of the orifice on a continuous basis. Before the extrudate passes into the water baffle seal it moves over a floating dancer roll (65), the position of which controls a haul-off, such as a vacuum belt, at the tail end of the system. This avoids pushing on the extrudate.
摘要:
A vacuum extrusion line includes a vacuum chamber (10) having an extrusion die (18) at one end and a water baffle immersion cooler (20) at the other end for extracting the extrudate to atmosphere, extrudate shaping and sizing equipment (62, 63, 64) downstream of the die (18), a large diameter fixed bulkhead (16) at the die (18), first (44) and second (46) large diameter movable sections surrounding the shaping and sizing equipment (62, 63, 64), and a smaller fixed section (24) of the chamber (10). The first section (44) sealing against the second section (46) and the fixed section (24) and telescoping over the fixed section to form a gap (68) with the second section (46) being movable within the limits of the gap (68). The second section (46) also seals against the large diameter fixed bulkhead (16). In this manner the downstream equipment (62, 63, 64) can be fully exposed by movement of one or both movable sections (44, 46), and adequate volume and spatial working environment is provided for large through-put.
摘要:
A horizontal vacuum extrusion line includes a fixed bulkhead (23), a die (24) inside the bulkhead, a telescoping vacuum chamber section (27) and a fixed chamber section (28, 29). A dam (33) in the fixed section forms a pond (72) for immersion cooling of the extrudate. A truss (35) extends from the dam to the bulkhead supporting, shaping and calibration equipment and extends through the telescoping section. Fluid pressurizable seals at each end of the telescoping section are operable after the telescoping section is closed against the bulkhead and the telescoping and fixed sections are locked together. The telescoping section provides a more compact line and easier access to the complex equipment downstream of the die. The extrudate from the die passes down into the pond (72) and then through an orifice (74) in a hood (75) projecting from the chamber into a lower level portion of the pond (78) exposed to atmosphere. The hood also includes a tractor drive (88) to push the extrudate through the underwater orifice. The hood and its contents are accessible through the atmospheric pond. A tractor haul-off and the tractor drive in the hood are the only extrudate drives between the calibration equipment and atmosphere. The higher level of the pond (72) within the chamber downstream of the dam is controlled by a valve in turn controlling the output of a pump. The valve control senses the pond level and operates independently of the vacuum controls. 00000
摘要:
The present invention relates to a method of forming a moulded fibrous product, comprising the steps of foaming (1) an aqueous suspension of natural fibres, optionally in combination with synthetic fibres, to provide a first fibrous foam, a surfactant may be added to aid the foaming, feeding the fibrous foam into a mould, mechanically withdrawing a part of the water (2) contained in the foam to produce a solidified, moist fibrous composition, and evaporating water (3) from the solidified, moist fibrous composition to produce a dry fibrous product.
摘要:
Disclosed is an apparatus and a corresponding method for producing a continuous foamed extrudate product in which the extrusion and initial expansion of the foamed extrudate is conducted within a chamber under a partial vacuum. The foamed extrudate (110) is then removed from the chamber (102) through an orifice (106) submerged within a liquid baffle (108a, 108b). The dimensions of the foamed extrudate are monitored as it approaches the orifice and, if necessary, the effective sizing of the orifice is adjusted through the movement of a pair of side gates (124) and a single vertical gate (132) arranged external the orifice to match opening to the foamed extrudate and impede the flow of liquid into the chamber through the orifice.
摘要:
An extruder (13) projects through a bulkhead (10) adapted to form part of a vacuum chamber (11), and a die (14) is mounted on the end of the extruder within the vacuum chamber. The extruder projects through a gland seal (40) which is formed in a sleeve surrounding the extruder. The seal (40) includes a plurality of seal rings surrounding the extruder (13) and packed in the sleeve and held in place in a preferred form by a yieldable retainer. A shaper (20) is positioned down stream of the die (14) and is clamped (36) to the upstream end of the die (14). The shaper (20) is mounted on tracks (29) on a girder extending from the bulkhead (10) clear of its periphery. The apparatus permits congruent axial movement of the extruder (13), die (14) and shaper (20) with respect to the bulkhead (10).