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.

An ultrasonic welder includes dynamic adjustment of a weld parameter used to control welds of weld cycles during serial operation of the ultrasonic welder. The ultrasonic welder includes a power supply controlled by a controller and the controller sets a value of the weld parameter for a next weld cycle based on a value of a stack heat energy parameter indicative of heat energy in the ultrasonic stack prior to beginning the next weld cycle. The controller controls the power supply based on the value set for the weld parameter to control a weld in the next weld cycle.

A system and method to control and adjust operation variables of high frequency welding and cutting equipment is described that allows to adjust the operation frequency and pressure of high-frequency welding and cutting equipment, with the possibility to perform automatic variations to increase or decrease the power based on historical data stored in memory, to promote the welding and cutting of leather, synthetic and plastic laminated materials.

The present invention refers to a method for controlling the laying down of components of tyres on forming drums, said method comprising: sending a first electromagnetic radiation (Ri1) on a first laying down structure (3a) comprising a forming drum (2) and a first component (CI) of a tyre laid down on said forming drum (2); detecting at least a first corresponding reflected radiation (Rr1), determining as a function of said first reflected radiation (Rr1) a first parameter (PI) representative of a first main length (LI) of said first component (CI); comparing said first parameter (PI) with one or more pre-stored reference values; generating a first correction signal (SI) as a function of said comparison; sending said first correction signal (SI) to at least one preparation station adapted to prepare said first component (CI) to regulate the preparation of further components. An apparatus for controlling the laying down of components of tyres on forming drums is also described.

The invention relates to a method for producing a butt-welded joint between tube segments of a tube made of a weldable plastic material using a welding machine and to a welding machine (10), two tube segments each being held by a clamping apparatus (11) of a welding device (21) of the welding machine, welding contact surfaces of tube end cross sections of the tube segments being fused by means of a heating element (22) of the welding device and the welding contact surfaces subsequently being pressed against each other by a handling apparatus (18) of the welding device using a joining pressure to form a butt-welded seam connecting the tube segments to each other in a joining plane, the welding device being controlled by a control device of the welding machine, a data model of a tube system having at least one tube and a plurality of butt-welded joints being stored in the control device of the welding device, the data model comprising at least one object dataset representing the corresponding butt-welded joint and each having attributes, the control device detecting at least one weld parameter of the welding device as another attribute for the corresponding butt-welded joint and adding this weld parameter to the object dataset.

A test piece configured for the implementation of a method for evaluating an assembly by welding of parts made of thermoplastic materials, wherein the test piece includes at least two parts based on thermoplastic materials having surfaces to be welded that are at least partially placed opposite one another and respective free surfaces, wherein at least one of the parts is a perforated reference part including at least one perforation.

Assemblies, apparatus, and methods for heat sealing and monitoring are disclosed. A dual heat-sealing system includes a heat seal bar assembly with process monitor that allows to quickly change out heat bands and ensure that the effective length of the heat band matches the width of the seal (of the material being sealed), providing consistent and superior seal quality. A heat seal bar assembly includes multiple heat bars sized to easily match the size of the pouch being sealed. The heat bars are removable and replaceable. The heat bars are provided with at least one memory chip. The memory chip allows for storage and retrieval of information regarding the replaceable heat bar.