A flexible discontinuous process produces a series of at least two articles containing thermally insulating polyurethane foam from at least three streams (A), (B) and (C). The process involves mixing the at least three streams with different mixing ratios and injecting the mixture into cavities of the articles. A production unit can be used for performing this process.

A flexible discontinuous process produces a series of at least two articles containing thermally insulating polyurethane foam from at least three streams (A), (B) and (C). The process involves mixing the at least three streams with different mixing ratios and injecting the mixture into cavities of the articles. A production unit can be used for performing this process.

Food container including: an external container composed of a material comprising a first plastic material, an internal container composed of a material comprising a second plastic material, said internal container being arranged inside the external container and being welded to the external container so as to form a sealing cavity between the internal container and the external container, said cavity including gas, characterized in that at least a portion of said internal container is resilient and configured to deform under expansion of the gas contained inside the cavity.

A product, e.g., insulated beverage bottle having a lid, and method of making it are disclosed. The product includes an outer hollow blow molded vessel in which an inner hollow blow molded vessel, is disposed. Each of vessel has a sidewall from which a flange projects. The flange of the outer vessel includes an annular wall. The flange of the inner vessel includes an engagement surface having an annular groove to receive the annular wall of the outer vessel. The inner vessel is arranged to be supported within the outer vessel on the flange of the outer vessel and with portions of the annular wall and annular groove engaging each other. Ultrasonic energy is applied to one of the flanges adjacent the engaging surfaces to concentrate the ultrasonic welding energy at those surfaces to produce a good double sided shear joint weldment thereat.