An apparatus is configured to make containers from sheet material. The apparatus includes a supply station for supplying a film having at least one folded portion having three or more film flaps folded and superimposed with respect to each other; a welding station configured to receive the film. The welding station comprises a welding head configured for welding the folded portion of the film and forming a container defining a housing compartment; the welding head comprises a heater made of electrically conductive material whose electrical resistivity, at least in a predetermined temperature range, decreases upon the increase of the temperature of the same electrically conductive material.

The present invention is directed to a method of incrementally stretching polymeric film formed from a blown film extrusion process. The present invention is further directed to a polymeric bag formed from an incrementally stretched polymeric film. The incremental stretching is performed on a collapsed polymeric bubble via a pair of intermeshing rollers. The incrementally stretched polymeric film may be stretched only along a portion of its width. The polymeric bag may be a drawstring trash bag with an extended hem where only the extended hem of the bag or the body of the bag comprises incrementally stretched polymeric film.

Tip bonded formed laminates, and methods for making tip bonded formed laminates, are made from multiple layers of formed substrates made from films which are bonded together at the tips of their formed protrusions. Tip bonded laminates can be designed with greater resistance to bending, improved resilience to compression, and can be patterned for directionally oriented responses to tensile loads. Also, tip bonded formed laminates made from multiple layers of formed substrates can use their layered structure to provide better aesthetics as well as better physical properties such as improved puncture resistance. Tip bonded formed laminates can be configured with thicker portions and designed patterns, which are appealing to consumers. A tip bonded formed laminate can be made from two or more formed substrates and can be used instead of a single, thick, unformed, substrate, so the laminate can use about the same amount of material, while still providing surprising functional benefits. Tip bonded formed laminates can provide these benefits without relying on more expensive polymers and/or high concentrations of additives and offer significant improvements at a reasonable cost, when compared with unformed, single layer substrates.

The invention comprises a package for reactive materials comprising a panel defining a first end, a second end opposite the first end, and at least two side edges. The panel comprises at least one film layer, an adhesive adjacent the film layer, wherein the adhesive is pattern applied such that it is disposed within an interior region of the film layer and wherein a perimeter of the film layer is adhesive-free adjacent each of the first end, second end, and side edges, and a release liner comprising a substrate layer and a cured silicone layer. The release liner is adhered to the film layer via the adhesive, the substrate layer of the release liner is disposed adjacent the film layer, and a perimeter of the release liner is smaller than the perimeter of the film structure. In an embodiment, the panel comprises a tubular body and the side edges are sealed together to form a fin seal, the first end is sealed closed to form an end seal, and the second end is sealed closed to form an end seal.

Methods for making tip bonded formed laminates are made from multiple layers of formed substrates made from films which are bonded together at the tips of their formed protrusions. Tip bonded laminates can be designed with greater resistance to bending, improved resilience to compression, and can be patterned for directionally oriented responses to tensile loads. Also, tip bonded formed laminates made from multiple layers of formed substrates can use their layered structure to provide better aesthetics as well as better physical properties such as improved puncture resistance. Tip bonded formed laminates can be configured with thicker portions and designed patterns, which are appealing to consumers. A tip bonded formed laminate can be made from two or more formed substrates and can be used instead of a single, thick, unformed, substrate, so the laminate can use about the same amount of material, while still providing surprising functional benefits.

The invention comprises a package for reactive materials comprising a panel defining a first end, a second end opposite the first end, and at least two side edges. The panel comprises at least one film layer, an adhesive adjacent the film layer, wherein the adhesive is pattern applied such that it is disposed within an interior region of the film layer and wherein a perimeter of the film layer is adhesive-free adjacent each of the first end, second end, and side edges, and a release liner comprising a substrate layer and a cured silicone layer. The release liner is adhered to the film layer via the adhesive, the substrate layer of the release liner is disposed adjacent the film layer, and a perimeter of the release liner is smaller than the perimeter of the film structure. In an embodiment, the panel comprises a tubular body and the side edges are sealed together to form a fin seal, the first end is sealed closed to form an end seal, and the second end is sealed closed to form an end seal.

The present invention is directed to a side-sealed open mesh fabric bag having one or more multi-layer seam structures. At least one side seam of the bag comprises a plurality of folded layers of the bag's fabric bonded together within a seam structure by a plurality of seal portions. At least one of those seal portions is a sacrificial seal configured to at least partially give from the seam structure, whilst one or more other seal portions of the seam structure remain intact. The sacrificial seal provides the bag with volumetric flexibility, whilst the remaining seam structure provides an improved seam strength.

A head seal device of a bag making apparatus includes a pair of seal units configured to face each other in a facing direction. Each of the seal units includes a heat seal member and a heater. The heat seal device includes an adjustment unit configured to move the first seal unit in a width direction of continuous sheet panels, and to move the second seal unit in the width direction of the sheet panels in accordance with movement of the first seal unit in the width direction.

The present invention is directed to a side-sealed open mesh fabric bag having one or more multi-layer seam structures. At least one side seam of the bag comprises a plurality of folded layers of the bag's fabric bonded together within a seam structure by a plurality of seal portions. At least one of those seal portions is a sacrificial seal configured to at least partially give from the seam structure, whilst one or more other seal portions of the seam structure remain intact. The sacrificial seal provides the bag with volumetric flexibility, whilst the remaining seam structure provides an improved seam strength.

A multilayer polymer film for use in packaging, particularly food packaging, and packaging made from the multilayer film, are disclosed, along with methods of manufacture of the multilayer film and the packaging. In preferred embodiments, the polymer film comprises an outer layer comprising machine direction oriented high-density polyethylene, an intermediate layer comprising adhesive and optionally ink, and an inner layer comprising high-density polyethylene, metallocene linear low-density polyethylene, and a plastomer. The inner or outer layer can be coated to lower the water vapor and oxygen transmission rates. In preferred embodiments, the layers are laminated to form the multilayer film. The multilayer film can be used to produce food packaging such as heat-sealable bags or pouches. Packaging made from the film is suitable for hot filling, and in contrast to packaging materials known in the art for hot filling, is fully recyclable.