Upholstery - Amann USA

1 Service & Technology Information for the sewing industry Upholstery Sewing Threads and Sewing Upholstery Sewing Threads and Sewing Upholstery Sewing Upholstery Seam quality standards for upholstered furniture are very high. Sewing thread When developing these products, seam and production planning Primarily polyester or polyamide sewing threads are used for sewing must consider the visual and functional aspects. Upholstery . Both are common in practice. The size must correspond to the material and must be synchronised to the seam stability required. This can vary depending on the material, sewing operation, and purpose. All sewing thread construction types are used.

2 In practice continuous filaments are often preferred due to their high technical performance. This construction type is typical, especially for sewing leather. Amann recommends the following sewing threads for the sewing operation listed below: Closing seams (incl. piping seams): SabaC, polyester/polyester corespun 25, 35, 50. 1). Rasant, polyester/cotton corespun 25, 30 , 35, 50. Saba, polyester cut staple 30. Serafil, polyester continuous filament 30, 40. ONYX, polyamide continuous filament 30, 40. On the one hand seams are a decorative element, shaping design Piping seams are sometimes pre-sewn with a finer thread size. The and overall appearance. But they have to be tough to endure the actual closing piping seam is sewn thereafter with the same thread assembly.

3 They are also influential in performance-related design for size as the closing seams to reach the required strong seam lock and the level of quality of the furniture. For perfect seams, even when to prevent diverging seams under crosswise strain. exposed to high stresses in later use, seam stability, seam abrasion resistance, and seam elasticity are of utmost importance. Most of Overedging the seams are exposed to high tension stress in a lengthwise and SabaC, polyester/polyester corespun 120, 150. crosswise direction during final assembly and on the finished piece. Rasant, polyester/cotton corespun 120. If seam stability and seam elasticity are insufficient due to unsuitable PaxX, polyester continuous filament, sewing parameters, broken seams will be the result.

4 Seam abrasion air-jet, texturised 150. resistance is also decisive for the product's quality in later use. All Serafil, polyester continuous filament 120/2. visible seams are not to show signs of wear and tear, even after SabaTEX, polyester continuous filament, long-term use. This isn't easy if you keep in mind the characteristic texturised 100, 120. abrasion stress on seating furniture. Decorative seams A real challenge facing Upholstery production is the great variety in different materials. Woven fabrics, knitted fabrics, leather (artificial SabaC, polyester/polyester corespun 25, 35. 1). and genuine), thick- or thin-coated or covered anything's possible, Rasant, polyester/cotton corespun 25, 30 , 35.

5 To some extent even in combination. The sewing parameters must Saba, polyester cut staple 8, 30. always be individually adjusted to the materials. Serafil, polyester continuous filament 10, 15, 20, 30, 40. ONYX, polyamide continuous filament 10, 13, 20, 30, 40. Upholstery repair is time consuming and very costly one more rea- Serabraid, polyester continuous filament, son to ensure optimal seam quality, to plan the seams very carefully, 2). braided 800, 1000, 1200, 1400. and to consistently implement the suitable processing parameters in production. The continuous filaments Serafil and ONYX, with their smooth surfaces, are ideally suited for genuine and artificial leather and are therefore often used for this.

6 In addition, the abrasion resistance of continuous filaments is very high, which is extremely beneficial for a long product life. 1). Rasant 30 is a polyamide/cotton corespun 2). Serabraid is available in the qualities T90 (heavily waxed hand sewing thread) and T60. (lightly waxed machine sewing thread). Service & Technology 2. SabaC, Rasant and Saba have a very soft and textile structure. They Needle point are preferably used for topstitching fabrics or knitted fabrics, when The kind of needle point depends on the type of material used. We a rather rustic or sportive character is intended. recommend the following needle points: Braided sewing threads like Serabraid allow very distinctive seam Woven and knitted fabrics: patterns and are often used when the seams are to be used as a Round or ball points: for example R or FFG/SES.

7 Special design feature. Upholstery without decorative seams is un- imaginable. Leather combined with woven fabrics: Round or ball points: for example R or FFG/SES. Needles Leather: Needle size Round or cutting point with small triangular cutting edge: for example R, SD1 or SD. Nm 90 - 140. SIZE 14 - 22 In practice other cutting points are also used for decorative seams on leather. The needle size depends on the material and the number of plies. Usually, the needle sizes Nm 90-140 (Size 14-22) are used. For A cutting point's grind is decisive for a stitch's position in the seam and thicker decorative seams it may be necessary to use a thicker needle thus for its appearance.

8 Different cutting points, for example in lens, size. Especially for braided threads, needles of size Nm 190 and diamond, or triangle shape, allow many more seam variations. You thicker must be used to ensure an optimal guidance of the sewing may choose from various cutting points depending on the look you thread through the fabric. want, for example: For more information on which needle to use, see the special sewing recommendations at the end of this chapter. Cutting point needles Groz-Beckert KG Cutting point needles Groz-Beckert KG. 3. Stitch type Special sewing recommendations Lockstitches (stitch type 301) are mainly used for Upholstery closing Diverging seams and topstitching seams as for piping seams.

9 To prevent stitches from gaping, it is extremely important to maintain Overlock stitches (stitch types 502, 503, 504 or 505) are used for the correct thread tension and thread balance between needle and overedging woven and knitted fabrics. bobbin thread. Upholstery covers on the finished sofa or armchair The double chainstitch (stitch type 401) is used where additional width are usually under stress, and "open" seams are very obvious and needs to be worked in or for pre-sewing round corners. affect product quality. Seam elasticity Machines Decorative seams often have low stitch density for fashionable rea- Lockstitch machines (joining and decorative seams); sons, and therefore they often have low seam elasticity.

10 To protect Double chainstitch machines for pre-sewing; these seams from overstretching (breaking) when the covers are Overlock machines (overedging) stretched, it may be necessary to apply seam tape which limits seam The sewing machines must be equipped for medium or heavy mate- elasticity. rials when processing Upholstery . For the often very large fabric Needles for special applications parts, long-arm machines are required for the topstitching. Com- mon machines used in practice are those with combined bottom, For 2-needle-topstitching used on Upholstery covers for sewing in needle, or top feed machines, or with an intermittent puller feed. zippers and for decorative seams or for stitching holding seams on These ensure perfect feed even for cross-seams, a high number of both inside and outside, the use of a needle with right-twisted point layers or thick material.