The embodiment provides a heat-sealing apparatus and a method of accurately controlling heat sealing temperature by measuring the temperature using a heat-sealing apparatus which heat-seals a pair of heat seal materials by nipping them between a pair of heating bodies. The method of heat-sealing includes mounting a cover material on the surface of at least one of the heating bodies to be in contact with the heat seal material, attaching a minute temperature sensor to the surface of the cover material on the side to be in contact with the heat seal material, and controlling temperature of welding face by the temperature detected by the minute temperature sensor, and an apparatus therefor.

The invention provides a sonotrode (100) for welding a material, the sonotrode (100) comprising a welding section (110) configured for contacting the material, wherein the welding section (110) defines a rounded shape (111) in a cross-section parallel to a longitudinal axis (A) of the sonotrode (100), wherein the rounded shape (111) approximates a circular sector (20), wherein the circular sector (20) has a central angle α.sub.c selected from the range of 25°-300°, and wherein the circular sector (20) has a central radius r.sub.c selected from the range of 5-30 mm, and wherein the sonotrode (100) has a width W perpendicular to the longitudinal axis (A) [and to the cross-section], wherein W is selected from the range of 10-100 mm.

The present invention relates to a method for evaluating an assembly by welding of parts made of thermoplastic materials, to a test piece and its associated uses, to an installation for implementing this method and to the associated welding system.

A method and apparatus for making bags from a film that follows a film path through a bag machine includes an input section located on the film path, a sealing section located on the film path downstream of the input section, an output section located on the film path downstream of the sealing section, and a controller, connected to control the sealing section. The sealing section includes a sealer that includes a heater block and a manifold. There is an air flow path from the heater block to the manifold. Air is heated in the heater block in response to a control signal provided by the controller to the heater block. The heated air is provided through the air path to the manifold. A temperature sensor is disposed in at least one of the air path and the manifold.

A workstation for a film-processing packaging machine defines a film transport plane in which the packaging film can be transported. In addition, the workstation comprises an electrically operable heating assembly. The latter in turn comprises an electrically conductive planar resistance heating element which in a plane parallel to the film transport plane has dimensions that are greater by a factor of at least 5, preferably at least 10, than in a direction perpendicular to the film transport plane. The resistance heating element is arranged between a heating plate and a clamping plate. The disclosure also relates to a packaging machine with such a workstation and to a method for operating such a workstation.

A system and method for thermoplastic composite welding comprising a cooling means and a heat source. The cooling means cools a heat-side laminate so as to create a thermal gradient in the heat-side laminate. The heat source heats the heat-side laminate after the cooling step is initiated but before the thermal gradient dissipates so that a first side of the heat-side laminate closer to the heat source does not deform as faying surfaces of the heat-side laminate and another laminate farther away from the heat source are welded together.

The purpose of the present invention is to provide a heat-sealing device capable of preventing problems associated with cap sealing performance and/or sensation of the cap being open due to an inappropriate cap temperature. For this purpose, this heat-sealing device (10), which is used in a manufacturing apparatus (100) for manufacturing a product for which an opening part (1A: mouth part) of a container (1) is sealed with a cap (2), is provided with: a pressing plate (5) which is disposed on a path along which the containers (1) move; a heating unit (3) and sealing heads (4) for pressing the caps (2) sealing the container (1), the heating unit (3) and sealing heads (4) being arranged on the pressing plate (5); a temperature measurement device (7) for measuring the temperatures of the sealing heads (4); and a control device (8: control unit) for transmitting control signals to a container conveyance drive source (for example, inverter) in accordance with the measurement results from the temperature measurement device (7).

A welding device includes a pair of pressure rollers for pressurizing a web and a strip member, a feed device configured to intermittently or continuously feed the web and the strip member through the pair of pressure rollers, and the laser device configured to irradiate the web or the strip member with a laser beam at a position upstream of the pair of pressure rollers. The welding device may include a movement device configured to move the pair of pressure rollers upstream with respect to the web and the strip member during pause or stop of feed. Alternatively, the feed device may pause or stop the web and the strip member after retracting the web and the strip member by a certain length.

A machine converts a web of preformed pouches, which are defined by transverse seals extending from a remote edge, into inflated dunnage units. A sealing arrangement is positioned to provide a longitudinal seal intersecting the transverse seals to close the preformed pouches and form a dunnage unit. The sealing arrangement has at least two sealing belts. Each belt is positioned so that respective first sides engage a surface of the web and pull the web through sealing elements positioned on either side of the web. A heating element is on a second side of the first belt not engaging the web. A compliant material is on a second side of the second belt not engaging the web. As the web passes between the heating element and compliant material, imperfections in the web are smoothed by the compliant material and the layers of the web are sealed by the heating element.

The invention relates to a method for welding a connection between a first joining surface of a first molded part and a second joining surface of a second molded part, which by means of a clamping device are moved and braced with their joining surfaces in contact with one another, wherein the first molded part is at least partially transparent for a primary beam of a first radiation source and at least partially absorbent for a secondary beam of a second radiation source, and the second molded part is at least partially absorbent for the primary beam, wherein sequentially the second molded part is irradiated with the primary beam and the first molded part is irradiated with the secondary beam.