摘要:
Injection molding, parts onto a carrier web (34) located between mold halves (18,20). Flow of polymer melt into the mold is assisted by application of ultrasonic energy to the mold cavity. After the molding operation, mold halves are separated, and the carrier web is advanced, or indexed, to a next position for another molding sequence. Molding apparatus comprises a moving mold face (20), that can move toward and away from a first mold member (18) (which can be stationary) in which the mold cavity is located, a means (24,25,26,30,32) for moving and/or indexing carrier web between the first mold member and the moving mold face, means (16) to inject polymer melt into the mold cavity, and an ultrasonic system (42) providing ultrasonic energy to the mold cavity. The carrier web can transport molded parts to subsequent process steps, such as coating, drying, inspection, curing, assembly or packaging.
摘要:
The present invention provides an apparatus for shaping deformable materials during molding processes. The apparatus includes a vibrating wall assembly which fits the contours of at least a portion of a mold's cavity. The vibrating wall assembly includes a pliable wall (30, 32, 34) positioned within the mold (21). The pliable wall (30, 32, 34) is positioned such that its outside wall surface (38, 42, 46) is adjacent to a portion of the mold's inside wall surface (36, 40, 44); and its inside wall surface (36, 40, 44) defines a portion of the geometric configuration of the material passing thereover. The pliable wall (30, 32, 34) is designed to deform from its original shape when a positive or negative pressure is exerted on its inside or outside wall surface. This positive and/or negative pressure is generated, at least in part, by the displacement of a displaceable fluid. This fluid is contained within a chamber (48, 50, 52) which is in communication with a portion of the pliable wall's outside surface (38, 42, 46).
摘要:
An ultrasonic molding device (100) for molding thin-walled optical components which includes an ultrasonic assembly (128) and a plunger assembly (132) for melting thermoplastic material and injecting it into a mold under reduced pressure conditions.
摘要:
An ultrasonic-assisted injection molding system and method for making precisely- shaped articles. A source of ultrasonic energy is positioned to apply vibrational energy to a mold cavity connected to at least one gate in flow communication with a source of molten (co)polymer. The mold is heated to a temperature of 104-116°C, and the molten (co)polymer is injected into the mold cavity. After cooling the mold until the molten (co)polymer within the gate has solidified, ultrasonic energy is applied to the mold without remelting the solidified (co)polymer within the gate until the temperature increases to 116-122°C, thereby substantially relieving flow induced stresses. The mold is then cooled until the temperature decreases to 101-107°C, and is thereafter heated until the temperature increases to 116-122°C, thereby substantially relieving any thermally induced stresses. The mold is cooled until the molten (co)polymer has solidified, thereby forming a precision molded plastic optical element.
摘要:
A method of molding a microneedle using a mold apparatus that comprises a mold insert (210) having the negative image of at least one microneedle (12), a compression core (240), and a mold housing configured to allow a reciprocal motion between the mold insert and the compression core. The mold apparatus has an open position and a closed position. The mold apparatus is placed in the closed position and polymeric material is injected into the closed mold apparatus. The injected polymeric material is compressed between the mold insert and the compression core by a reciprocal motion between the compression core and the mold insert. Also, molding methods wherein the mold apparatus has sidewalls having an injection gate (270). Also, molding methods comprising a heated mold insert. Also, molding methods comprising the application of high frequency acoustic energy, such as ultrasonic energy, to the mold apparatus.
摘要:
A method of molding a microneedle using a mold apparatus that comprises a mold insert having the negative image of at least one microneedle, a compression core, and a mold housing configured to allow a reciprocal motion between the mold insert and the compression core. The mold apparatus has an open position and a closed position. The mold apparatus is placed in the closed position and polymeric material is injected into the closed mold apparatus. The injected polymeric material is compressed between the mold insert and the compression core by a reciprocal motion between the compression core and the mold insert. Also, molding methods wherein the mold apparatus has sidewalls having an injection gate. Also, molding methods comprising a heated mold insert. Also, molding methods comprising the application of high frequency acoustic energy, such as ultrasonic energy, to the mold apparatus.
摘要:
Die Erfindung bezieht sich auf ein Verfahren und eine Vorrichtung zum Umformen eines kristallisierbaren Materials, insbesondere eines leichtmetallischen Werkstoffes oder eines Polymerwerkstoffes, im flüssigen oder pastösen Zustand, das man nach der Umformung und erfolgter Formgebung erstarren lässt, wobei das Material vor und/oder während des Umformens und/oder Erstarrens zumindest in Teilbereichen zu Schwingungen angeregt wird. Bei Bedarf wird das Material während des Umformens und/oder Erstarrens zumindest in Teilbereichen zusätzlich mit Kristallisationskeimen geimpft. Eine hierbei verwendete Vorrichtung umfasst eine Heizeinheit (1, 2) zum Aufheizen von kristallisierbarem Material, eine Formeinheit (5, 6), die einen Formhohlraum (7) bestimmt, eine Schusseinheit (3, 4), mit der das Material unter Druck in die Formeinheit (5, 6) gepresst wird, sowie eine Dosiereinheit (8, 9, 10, 19) zum dosierten Zuführen des Materials im flüssigen oder pastösen Zustand aus der Heizeinheit (1, 2) in eine Giesseinheit (3, 4), wobei der Vorrichtung zumindest in Teilbereichen mindestens eine Einheit (S1 - S11) zur Erzeugung mechanischer Schwingungen zugeordnet ist.
摘要:
A semi-solid mixture of noncomestible material is brought into contact with a virbrating surface of a mold (113) including two vibrating tools (108, 110) each having a cavity (111) therein, whereby energy is transported across the surface into the mixture to form a molded cylindrical shape (112). The mixture is injected into the mold (113) from the side through a port defined by surfaces (115) after the two vibrating tools (108, 110) are brought together. The vibration is generally in the ultrasonic frequency range, and the energy injection is sufficient to cause local physical and chemical changes in mixtures susceptible to such changes, and generally to cause changes in the direction of increased tensile strength and resistance to flow. In general, a skin is formed on the mixture, and with greater processing efficiency then if such skin were formed by purely thermal means.
摘要:
An ultrasonic-assisted injection molding system and method for making precisely- shaped articles. A source of ultrasonic energy is positioned to apply vibrational energy to a mold cavity connected to at least one gate in flow communication with a source of molten (co)polymer. The mold is heated to a temperature of 104-116°C, and the molten (co)polymer is injected into the mold cavity. After cooling the mold until the molten (co)polymer within the gate has solidified, ultrasonic energy is applied to the mold without remelting the solidified (co)polymer within the gate until the temperature increases to 116-122°C, thereby substantially relieving flow induced stresses. The mold is then cooled until the temperature decreases to 101-107°C, and is thereafter heated until the temperature increases to 116-122°C, thereby substantially relieving any thermally induced stresses. The mold is cooled until the molten (co)polymer has solidified, thereby forming a precision molded plastic optical element.