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CN-121970951-A - Production process of anti-tightening underpants

CN121970951ACN 121970951 ACN121970951 ACN 121970951ACN-121970951-A

Abstract

The invention provides an anti-tightening underpants production process which comprises the following steps of 1, providing underpants blanks, 2, arranging a slow-pressing edge forming area inwards at waist openings and leg openings of the underpants blanks, 3, preparing a zoned stretching elastic adhesive tape circumferentially matched with the waist openings and the leg openings, 4, coating hot melt adhesive on the joint surface of the zoned stretching elastic adhesive tape to form an adhesive layer, 5, loading the underpants blanks on a pretension calibration fixture, 6, positioning and attaching the rubberized zoned stretching elastic adhesive tape and the slow-pressing edge forming area, and carrying out zoned hot-press adhesion under the assistance of vacuum adsorption or pressure difference, and 7, cooling, shaping and clamping unloading after hot pressing.

Inventors

  • CHEN WANTING
  • He Xuqin
  • ZHAO GUOQING

Assignees

  • 浙江琪多姿服饰有限公司

Dates

Publication Date
20260505
Application Date
20251230

Claims (7)

  1. 1. The production process of the anti-tightening underpants is characterized by comprising the following steps of: Step 1, providing a underpants blank, wherein the underpants blank is a seamless underpants blank or a cut-piece type underpants body; Step 2, arranging a slow-press forming edge area inwards at the waist opening and the leg opening of the underpants blank; step 3, preparing a zoned stretch-limiting elastic adhesive film belt which is circumferentially matched with the waist opening and the leg opening, wherein the zoned stretch-limiting elastic adhesive film belt at least comprises a first functional section and a second functional section along the circumferential direction, and the equivalent elastic constraint of the second functional section is smaller than that of the first functional section; Step 4, coating hot melt adhesive on the joint surface of the partition stretch-limiting elastic adhesive film belt to form an adhesive layer; Step 5, loading the underpants blank on a pretension calibration fixture, and applying different pretension rates to corresponding positions of different functional sections along the circumferential direction to enable the pretension rate of corresponding positions of the second functional section to be smaller than that of corresponding positions of the first functional section; Step 6, positioning and attaching the glued partition stretching elastic adhesive film tape and the slow-press forming edge area, and performing partition hot-press bonding under the assistance of vacuum adsorption or pressure difference, wherein the hot-press curing parameters corresponding to the second functional section are lower than those corresponding to the first functional section; And 7, cooling, shaping and clamping off after hot pressing to obtain the finished product of the anti-tightening underpants with the waist opening and the leg opening having partition rebound difference.
  2. 2. The process for producing the anti-snagging underpants according to claim 1, wherein the step S1 is followed by a low tension pre-shrinking treatment of the underpants body, the pre-shrinking is a steam pre-shrinking, the pre-shrinking temperature is 75-85 ℃, and the pre-shrinking time is 20-35 minutes.
  3. 3. The process for producing the anti-tightening underpants according to claim 1, wherein the zoned stretch-limiting elastic adhesive tape is divided into at least three sections along the circumferential direction, namely a front section, a side section and a rear section, wherein the side section is a second functional section; and the side sections at least meet any of a smaller width, thinner thickness, or higher cell density than the front and rear sections to reduce the equivalent elastic constraint of the side sections.
  4. 4. The production process of the anti-tightening underpants according to claim 1, wherein the elastic adhesive film belt with the zoned stretching limitation is provided with a stress release microstructure close to the skin-adhering edge, the stress release microstructure is a micropore array and a micro-incision array, the micropore aperture is 0.3-0.8 mm, the pitch of holes is 1.5-4 mm, and 1-3 rows are arranged along the circumferential direction.
  5. 5. The process for producing the anti-tightening underpants according to claim 1, wherein the hot melt adhesive in the step S4 is PUR hot melt adhesive or polyurethane hot melt adhesive, intermittent adhesive coating or unit area adhesive coating amount reduction is adopted in the second functional section, continuous adhesive coating or unit area adhesive coating amount improvement is adopted in the first functional section, and the adhesive film tape is pre-cured and dried after adhesive coating, wherein the drying temperature is 50-70 ℃ and the drying time is 10-15 minutes.
  6. 6. The production process of the anti-tightening underpants according to claim 1, wherein the pre-stretching rate in the step S5 is satisfied, the pre-stretching rate of the corresponding position of the second functional section is 2% -6%, and the pre-stretching rate of the corresponding position of the first functional section is 6% -12%.
  7. 7. The process for producing anti-snagging underpants according to claim 1, wherein said step S6 uses a two-stage zoned hot-press curve: The temperature of the pre-bonding section is 75-85 ℃, the pressure is 0.15-0.30 MPa, and the time is 8-20 s; The temperature of the curing section is 85-95 ℃, the pressure is 0.25-0.45 MPa, and the time is 10-35 s; The pressure and time of the curing section of the second functional section are reduced by 10% -30% relative to those of the first functional section; And in the step S7, the light pressure is kept at 0.05-0.15 MPa for cooling for 60-180S during cooling and shaping.

Description

Production process of anti-tightening underpants Technical Field The invention relates to the field of clothing, in particular to a production process of anti-tightening underpants. Background The comfort of the underpants as a high-frequency close-fitting wearing article is highly dependent on the edge structures of waist and leg openings. The traditional underpants usually adopts a sewing mode of an elastic band for sewing, edge wrapping or edge folding to obtain binding and rebound support, but due to the reasons of higher modulus of the elastic band, thick stitch overlapping, fluctuation of local sewing tension and the like, obvious tightening marks are easily formed on the skin, friction stimulation is generated during walking and sedentary sitting, meanwhile, the sewing procedures are multiple, the process window is narrow, and the same batch size and the inconsistent tightness are more easily caused by the sewing tension and elastic band rebound difference in batch manufacturing, so that the problems of tight tightening feeling and local pressure concentration are further amplified. In recent years, the trend of no-mark has driven industry to try to replace part of sewing with adhesive film bonding, especially to use adhesive film bonding technology at the waist/foot mouth to improve flatness and reduce sewing marks. The technology also comprises the steps of softening the adhesive film, attaching the adhesive film by vacuum adsorption or pressure difference, hot-pressing at 80-90 ℃ and cooling and shaping, thereby realizing firm adhesion of the adhesive film at the edge. The thread protrusion and friction points can be reduced to a certain extent by the above thought, but the thread protrusion and friction points still have obvious defects in the aspects of the consistency of actual wearing and mass production, and the thread protrusion and friction points mainly appear in the following steps: 1. many adhesive films or hot pressing schemes are of the same width and thickness and the same adhesive strength in the whole circle, so that pressure peaks still appear in areas with different human curvatures and soft tissue thicknesses such as front abdomen, hip side, back waist and the like of waist opening/leg opening. That is, although the "suture tie point" is changed to the "adhesive film continuous constraint", the fundamental contradiction of the "different constraint is not solved. 2. If the blank is in an unstable tension state during edge bonding, rebound after hot pressing is solidified and locked, so that certain areas are passively contracted more obviously when the blank is worn, new tightening points and curled edges are generated, and in addition, the problems of foaming, edge curling, washing resistance reduction and the like can be caused by insufficient adhesive layer thickness and bonding exhaust. 3. Even if softening is tried on the material, quantitative calibration steps of prestretching amounts of different circumferential areas and hot-press curing strength are often lacking, so that the process can only rely on empirical tuning, and the batch stability is difficult to ensure. Disclosure of Invention In order to solve the technical problems, the invention provides a production process of the anti-tightening underpants, which solves the problems mentioned in the background technology. The production process of the anti-tightening underpants provided by the invention comprises the following steps: Step 1, providing a underpants blank, wherein the underpants blank is a seamless underpants blank or a cut-piece type underpants body; Step 2, arranging a slow-press forming edge area inwards at the waist opening and the leg opening of the underpants blank; step 3, preparing a zoned stretch-limiting elastic adhesive film belt which is circumferentially matched with the waist opening and the leg opening, wherein the zoned stretch-limiting elastic adhesive film belt at least comprises a first functional section and a second functional section along the circumferential direction, and the equivalent elastic constraint of the second functional section is smaller than that of the first functional section; Step 4, coating hot melt adhesive on the joint surface of the partition stretch-limiting elastic adhesive film belt to form an adhesive layer; Step 5, loading the underpants blank on a pretension calibration fixture, and applying different pretension rates to corresponding positions of different functional sections along the circumferential direction to enable the pretension rate of corresponding positions of the second functional section to be smaller than that of corresponding positions of the first functional section; Step 6, positioning and attaching the glued partition stretching elastic adhesive film tape and the slow-press forming edge area, and performing partition hot-press bonding under the assistance of vacuum adsorption or pressure difference, wherein the hot-press curing parameters