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EP-4741481-A1 - SHEET-TYPE LAUNDRY DETERGENT MANUFACTURING METHOD

EP4741481A1EP 4741481 A1EP4741481 A1EP 4741481A1EP-4741481-A1

Abstract

A sheet type laundry detergent manufacturing method is disclosed. The method includes aging a laundry detergent composition containing purified water, polyvinyl alcohol (PVA), polyvinylpyrrolidone (PVP), starch, and a surfactant in an aging room. The aged composition is foamed using a foaming device to obtain a predetermined density and viscosity. The foamed composition is then applied onto a release film at a predetermined thickness using a comma coater. Thereafter, the release film coated with the composition is dried to remove only the purified water, thereby forming the composition into a sheet material. The formed sheet material is peeled from the release film. In addition, a plurality of sheet materials may be laminated by spraying water in a mist form, stacking one or more sheets, and drying the stacked sheets. Through the disclosed manufacturing method, a sheet-type laundry detergent having improved handling properties and process stability may be provided.

Inventors

  • LEE, KUN HEE
  • KIM, YONG HO

Assignees

  • Luthione Co., Ltd

Dates

Publication Date
20260513
Application Date
20240509

Claims (10)

  1. A sheet type laundry detergent manufacturing method, comprising: an aging step of aging a laundry detergent composition in an aging room, the laundry detergent composition being prepared by including purified water, polyvinyl alcohol (PVA), polyvinylpyrrolidone (PVP), starch, and a surfactant; a foaming step of foaming the laundry detergent composition that has undergone the aging step using a foaming device such that the laundry detergent composition has a density of 0.1 to 0.9 g/cm 3 and a viscosity of 25,000 to 55,000 cps; a coating step of placing the foamed laundry detergent composition into a coating liquid tank of a comma coater and applying the composition onto a release film at a predetermined thickness; a drying step of placing the release film coated with the laundry detergent composition into a dryer to dry only the purified water, thereby forming the laundry detergent composition applied on the release film into a sheet material; a peeling step of peeling the laundry detergent composition, which is maintained in a sheet form and from which the purified water has been removed through the drying step, from the release film; and a lamination step of spraying water in a mist form onto the laundry detergent composition that has been formed into a sheet form through the peeling step, stacking one to ten sheets, and then placing the stacked sheets into the dryer to laminate a plurality of sheet-type laundry detergent compositions.
  2. The method of claim 1, wherein the laundry detergent composition comprises, based on a total weight of the composition: 7 to 17 wt% of the PVA; 2 to 8 wt% of the PVP; and 2 to 8 wt% of the starch.
  3. The method of claim 2, wherein the surfactant comprises: 40 to 60 wt% of AOS-1416, which is an anionic surfactant; 2 to 8 wt% of PCG, which is an anionic surfactant; and 6 to 14 wt% of APG, which is a nonionic surfactant.
  4. The method of claim 2, further comprising: 0.1 to 0.6 wt% of sodium benzoate; 0.3 to 1.5 wt% of sodium citrate; 0.3 to 1.5 wt% of citric acid; and 1 to 6 wt% of salt.
  5. The method of claim 2, further comprising: 0.3 to 3 wt% of a natural soap component; 0.3 to 3 wt% of a silk extract; 0.5 to 6 wt% of cyclodextrin; and 0.5 to 6 wt% of a plurality of enzymes.
  6. The method of claim 1, wherein the aging step comprises aging the laundry detergent composition for 2 to 50 hours at a temperature of 25 to 70°C.
  7. The method of claim 1, wherein the coating step comprises applying the laundry detergent composition at a thickness of 0.3 to 3.8 mm.
  8. The method of claim 1, wherein the drying step comprises drying the purified water by setting a dryer temperature to 40 to 210°C and a drying speed to 0.3 to 6 m/min.
  9. The method of claim 1, wherein, in the peeling step, the peeled sheet material has: a thickness of 0.3 to 3.8 mm; and a density of 0.03 to 0.35 g/cm 3 .
  10. The method of claim 1, wherein, in the lamination step, the dryer is operated at a temperature of 50 to 130°C.

Description

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a sheet type laundry detergent manufacturing method. Background Art In general, detergents used in washing machines have conventionally been provided in the form of powder detergents or liquid detergents. However, liquid detergents are relatively heavy, which may discourage consumer use, while powder detergents tend to generate airborne dust during handling and leave residues after washing. Accordingly, there has been a continuous demand for the development of a new type of laundry detergent that overcomes such drawbacks. In response to these issues, sheet-type solid laundry detergents have been developed as an improvement over conventional detergents. Nevertheless, such sheet-type solid detergents typically exhibit alkaline properties, which may cause skin irritation or damage, and further suffer from insufficient solubility of the sheet itself, resulting in incomplete dissolution during washing. DETAILED DESCRIPTION OF THE INVENTION Technical Problem In view of the above technical background, the present invention has been devised to provide a method for manufacturing a sheet-type laundry detergent that has excellent washability, excellent solubility, and is easy to store and use. Means for Solving the Technical Problem A method for manufacturing a sheet-type laundry detergent according to one embodiment of the present invention includes aging, in an aging room, a laundry detergent composition prepared by including PVA, PVP, starch, and a surfactant in purified water, foaming, by using a foaming device, the laundry detergent composition that has undergone the aging such that the density becomes 0.1 to 0.9 g/cm2 and the viscosity becomes 25,000 to 55,000 cps, placing the foamed laundry detergent composition in a coating solution tank of a comma coater and applying the composition onto a release film at a predetermined thickness, placing the release film and the laundry detergent composition that has undergone the coating into a dryer to dry only the purified water so as to form the laundry detergent composition applied to the release film into a sheet, peeling the laundry detergent composition maintained in a sheet form and from which the purified water has been removed through the drying from the release film, and spraying water in a mist form onto the laundry detergent composition in the sheet form obtained through the peeling, stacking 1 to 10 sheets, and then placing the stacked sheets into the dryer to laminate a plurality of sheet-type laundry detergent compositions. The laundry detergent composition may include, based on the total weight thereof, 7 to 17 wt% of the PVA, 2 to 8 wt% of the PVP, and 2 to 8 wt% of the starch. The surfactant may include 40 to 60 wt% of AOS-1416 as an anionic surfactant, 2 to 8 wt% of PCG as an anionic surfactant, and 6 to 14 wt% of APG as a nonionic surfactant. The composition may further include 0.1 to 0.6 wt% of sodium benzoate, 0.3 to 1.5 wt% of sodium citrate, 0.3 to 1.5 wt% of citric acid, and 1 to 6 wt% of salt. The composition may further include 0.3 to 3 wt% of a natural soap component, 0.3 to 3 wt% of a silk extract, 0.5 to 6 wt% of cyclodextrin, and 0.5 to 6 wt% of a plurality of enzymes. The aging step may age the laundry detergent composition for 2 to 50 hours at a temperature of 25 to 70°C. The coating step may apply the composition to a thickness of 0.3 to 3.8 mm. In the drying step, the dryer temperature may be set to 40 to 210°C and the drying speed may be set to 0.3 to 6 m/min to dry the purified water. In the peeling step, the peeled sheet may have a thickness of 0.3 to 3.8 mm and a density of 0.03 to 0.35 g/cm3. In the lamination step, the dryer may have a temperature of 50 to 130°C. Effects of the Invention The method for manufacturing a sheet-type laundry detergent according to one embodiment of the present invention may have excellent washability, excellent solubility, and convenience in storage and use. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flowchart illustrating a sheet type laundry detergent manufacturing method according to one embodiment of the present invention.FIG. 2 is a perspective view illustrating a sheet type laundry detergent according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that a person having ordinary skill in the art to which the present invention pertains can readily practice the invention. The present invention may be embodied in various different forms and is not limited to the embodiments described herein. In the drawings, portions irrelevant to the description are omitted for clarity, and the same or similar reference numerals are used to designate the same or similar components throughout the specification. As used herein, the terms "comprise," "include," or "ha