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CN-121989537-A - Composite case shell and preparation method thereof

CN121989537ACN 121989537 ACN121989537 ACN 121989537ACN-121989537-A

Abstract

The invention discloses a composite case shell and a preparation method thereof, wherein the composite case shell comprises a first group of BOPP film layers, a woven cloth middle layer and a second group of BOPP film layers which are sequentially laminated, the woven cloth middle layer is a PP flat yarn woven cloth with enhanced stretching orientation, and the first group of BOPP film layers and the second group of BOPP film layers are respectively laminated and compounded by a plurality of layers of transparent BOPP films. The composite case shell is prepared by a lamination hot-press molding process, has the characteristics of low cost, high strength, light weight and excellent low-temperature performance, can clearly reserve the knitting texture and texture of the PP flat yarn knitted cloth, and remarkably improves the comprehensive performance and the cost performance.

Inventors

  • HE YUESHAN
  • CHEN HUIQIANG
  • HE GUOHONG

Assignees

  • 爱途(河源)箱包有限公司

Dates

Publication Date
20260508
Application Date
20260309

Claims (8)

  1. 1. The utility model provides a compound case and bag casing, its characterized in that, this compound case and bag casing is including the first group BOPP rete, intermediate level and the second group BOPP rete that stacks gradually the setting, the intermediate level is the PP flat yarn woven cloth through tensile orientation reinforcing, first group BOPP rete and second group BOPP rete are formed by the lamination of multilayer transparent BOPP membrane respectively.
  2. 2. The composite bag housing according to claim 1, wherein the thickness of the films in the first and second sets of BOPP film layers is 0.01mm to 0.08mm.
  3. 3. The composite luggage case of claim 1, wherein said transparent BOPP film has a longitudinal tensile strength >120MPa, a transverse tensile strength >270MPa, a longitudinal fracture nominal strain >130% and a transverse fracture nominal strain >45% as measured according to GB/T1040.3-2006.
  4. 4. The composite luggage case according to claim 1, wherein the PP flat-filament woven cloth has a grammage of 80g/m2-150g/m2.
  5. 5. A composite luggage case according to claim 1, wherein the PP flat-filament woven cloth has a warp tensile load > 360N/50 mm and a weft tensile load > 340N/50 mm, as determined according to GB/T1040.3-2006.
  6. 6. The method for manufacturing a composite luggage shell according to any one of claims 1 to 5, comprising the steps of: (1) Raw material pretreatment, namely cutting the stretched and oriented PP flat yarn woven cloth and the transparent BOPP film to a size matched with the size of the case shell for standby; (2) Laying a plurality of layers of transparent BOPP films, a layer of PP flat yarn woven cloth and a plurality of layers of transparent BOPP films in sequence; (3) Preheating pressing plates, namely placing the raw materials which are well layered and laid into a hot press to preheat the pressing plates; (4) Hot-press molding, namely placing the preheated plate into a hot-press mold for hot-press molding; (5) And (3) maintaining the pressure and cooling, namely maintaining the pressure until the temperature of the die is reduced to below 60 ℃ after the hot pressing is finished, and opening the die to obtain the composite case shell.
  7. 7. The method for producing a composite luggage case according to claim 6, wherein in the step (3), the preheating temperature is 145 to 155 ℃, the preheating pressure is 0.2 to 0.5 Mpa, and the pressurizing time is 3 to 5 minutes.
  8. 8. The method for producing a composite luggage case according to claim 6, wherein in the step (4), the hot pressing temperature is 163 ℃ to 167 ℃, the pressure is 2.0 to 5.0 MPa, and the pressing time is 30 to 80s.

Description

Composite case shell and preparation method thereof Technical Field The invention belongs to the field of bags, and particularly relates to a composite bag shell and a preparation method thereof. Background The luggage is used as common equipment for daily travel, and the performance, cost and appearance texture of the shell directly determine the market competitiveness of the product. The main stream of the case and bag shell in the market at present is mainly formed by injection molding of PP or modified PP materials or by plastic suction molding of PC and other materials. However, due to limitations of materials and production processes, both injection molding and plastic suction cannot achieve both weight reduction and toughness. CN121492371a discloses a shell formed by laminating transparent BOPP films through hot press, which has the characteristics of low production cost, high forming efficiency and higher mechanical strength, but because BOPP films do not have obvious textures, the shell has monotonous appearance and poor texture, and is difficult to meet aesthetic requirements of middle-high end markets. In addition, the problem that the prior draw-bar box shell is easy to embrittle and reduce shock resistance in a low-temperature environment is solved, and particularly when the draw-bar box shell is used in northern cold areas, the shell is easy to damage, so that the service life of the product is influenced. Therefore, developing a case shell with cost, strength, appearance texture and low-temperature performance is a technical problem to be solved in the current field. Disclosure of Invention In order to overcome the defects in the prior art, the invention aims to provide the composite case shell taking the stretching orientation reinforced PP flat yarn woven cloth and the transparent BOPP film as raw materials and the preparation method thereof. The invention is realized by the following technical scheme: the utility model provides a compound case and bag casing, this compound case and bag casing is including the first group BOPP rete, intermediate level and the second group BOPP rete that stacks gradually the setting, the intermediate level is the PP flat yarn woven cloth through tensile orientation reinforcing, first group BOPP rete and second group BOPP rete are formed by the laminating of multilayer transparent BOPP membrane respectively. The invention adopts the PP flat yarn woven cloth with enhanced stretching orientation and the transparent BOPP film to carry out reasonable compound collocation, wherein the PP flat yarn woven cloth is only provided with one layer and is positioned between the first group of BOPP film layers and the second group of BOPP film layers, and the first group of transparent BOPP film layers can clearly highlight the woven texture of the middle PP flat yarn woven cloth and improve the surface gloss, thereby not only completely retaining the natural woven texture, but also solving the defects of no texture and monotone appearance of the pure BOPP film shell. And the synergistic enhancement effect is realized by utilizing the high-strength characteristics of the first group of BOPP film layers and the tensile properties of the PP flat yarn woven cloth, so that the prepared composite case shell has the advantages of low cost and high strength, and the comprehensive performance and the cost performance are obviously improved. The transparent BOPP film disclosed by the invention can be obtained in a commercially available mode. As a preferred embodiment of the present invention, the thickness of the films in the first and second sets of BOPP film layers is 0.01-0.08mm, and the multilayer stack ensures the necessary thickness of the shell. The thickness requirements of the case shells with different sizes can be met by adjusting the thicknesses or the layer numbers of the first BOPP film layers and the second BOPP film layers. Typically, a 20 inch box shell plate thickness is 1.00mm to 1.10mm, a 24 inch box shell plate thickness is 1.10mm to 1.20mm, and a 28 inch box shell plate thickness is 1.20mm to 1.30mm. As a preferred embodiment of the invention, the transparent BOPP film has a longitudinal tensile strength of >120MPa, a transverse tensile strength of >270MPa, a longitudinal fracture nominal strain of >130%, a transverse fracture nominal strain of >45% as detected according to GB/T1040.3-2006, and ensures the tensile property and toughness of the shell. As a preferred embodiment of the invention, the gram weight of the PP flat yarn woven cloth is 80g/m < 2 > -150g/m < 2 >. As a preferred embodiment of the invention, the PP flat yarn woven cloth has a warp tensile load of > 360N/50 mm and a weft tensile load of > 340N/50 mm, as measured according to GB/T1040.3-2006. The invention also provides a preparation method of the composite case shell, which comprises the following steps: (1) Raw material pretreatment, namely cutting the PP flat yarn woven cloth and the tr