Containers housed with random angular orientation of their thread in a first plurality of seats present circumferentially in a first rotatable carousel, caps are housed with random angular orientation of their thread in a second plurality of scats present circumferentially in a second rotatable carousel, ae current image is acquired of the thread of the container in transit through a first framing field and a current image of the thread of the cap in transit through a second framing field, a current value is calculated of the angular position of the thread of the cap in transit through the second framing field and a current value of the angular position of the thread of the container in transit through the first framing field by comparing their current image with an optical reconstruction thereof preliminarily learned, and the screwing operation is programmed with the calculated value of the current angular position.

Systems, methods, and apparatus are disclosed herein for assembling a container cap to a container, which utilizes one or more independently operated torque limiter assemblies for securing a container top to a container. A packaging system for assembling a container can include chuck assemblies, torque limiter assemblies, and a controller. The controller can be configured to command each chuck assembly and/or torque limiter assembly independently from other assemblies within the packaging system. Threads of the container top and the corresponding attachment component can be properly orientated and aligned independently of other container tops and corresponding attachment components prior to securing action, such as to preclude each attachment component from being over-tightened or under-tightened relative to the respective container.

Disclosed is a method of fastening a cap of a container, the method including: specifying a screw thread engagement point of a cap and a neck ring of a container; and aligning the engagement point with a fastening start position of the cap and fastening the cap to the neck ring, in which the specifying of the engagement point includes detecting the engagement point by rotating the cap in a reverse direction in a state where the cap is seated on the neck ring.