A sewing machine has seam-forming tools, comprising a needle for guiding an upper thread and a looper. The needle is designed as a curved needle which is pivotable about a needle pivot axis. This embodiment is such that a distance of the curved needle from the pivot axis is equal to a radius of a curve of the curved needle about the pivot axis. The looper is designed as a looper which is rotatable about a looper rotational axis and has a lower thread reserve. The looper rotational axis runs parallel to a sewing material support region. The sewing machine can be used to produce a durable seam.

A Strobel Insole of fully recyclable stitch-bonded fabric for use in construction of a shoe using the California Slip Last construction method. The stitch-bonded fabric is substantially 100% polyester stitched with two different yarns in different patterns. One side of the stitch-bonded fabric is subject to abrasion to break filaments of a relatively low denier stitching yarn to yield a soft brushed surface. A method of insole fabric production is also provided.

A Strobel Insole of fully recyclable stitch-bonded fabric for use in construction of a shoe using the California Slip Last construction method. The stitch-bonded fabric is substantially 100% polyester stitched with two different yarns in different patterns. One side of the stitch-bonded fabric is subject to abrasion to break filaments of a relatively low denier stitching yarn to yield a soft brushed surface. A method of insole fabric production is also provided.

A spar for an airfoil comprises a core, e.g. a foam core, a central structural member extending through the core, an outer structural layer surrounding the core and central structural member and a plurality of yarns extending through the central structural member.

A spar for an airfoil comprises a core, e.g. a foam core, a central structural member extending through the core, an outer structural layer surrounding the core and central structural member and a plurality of yarns extending through the central structural member.

A sewing machine has seam-forming tools, comprising a needle for guiding an upper thread and a looper. The needle is designed as a curved needle which is pivotable about a needle pivot axis. This embodiment is such that a distance of the curved needle from the pivot axis is equal to a radius of a curve of the curved needle about the pivot axis. The looper is designed as a looper which is rotatable about a looper rotational axis and has a lower thread reserve. The looper rotational axis runs parallel to a sewing material support region. The sewing machine can be used to produce a durable seam.

A spar for an airfoil comprises a core, e.g. a foam core, a central structural member extending through the core, an outer structural layer surrounding the core and central structural member and a plurality of yarns extending through the central structural member.

A spar for an airfoil comprises a core, e.g. a foam core, a central structural member extending through the core, an outer structural layer surrounding the core and central structural member and a plurality of yarns extending through the central structural member.

A decorative engineered self-hem and a method to prepare the decorative engineered self-hem in a single fabric is disclosed herein. It is prepared without having any additional cut and sew, with various weave patterns designed in a design area 10-20 inches from a selvedge area and the rest of the fabric is woven in conventional weave pattern such as satin/twill. The method of preparation includes cutting the fabric parallel to a selvedge area; folding the fabric overlapping the selvedge area; and folding the full fabric horizontally and, at the same time, hemming of edge of the selvedge area to finish.

A decorative engineered self-hem and a method to prepare the decorative engineered self-hem in a single fabric is disclosed herein. It is prepared without having any additional cut and sew, with various weave patterns designed in a design area 10-20 inches from a selvedge area and the rest of the fabric is woven in conventional weave pattern such as satin/twill. The method of preparation includes cutting the fabric parallel to a selvedge area; folding the fabric overlapping the selvedge area; and folding the full fabric horizontally and, at the same time, hemming of edge of the selvedge area to finish.