KR20120130688A - Laundry sheet having continuing surface and discontinuing surface and, manufacturing methods for the laundry sheet - Google Patents

Abstract

PURPOSE: A water-soluble sheet for laundry is provided to not need to be removed after laundry by being completely dissolved in water, to have excellent cleaning performance, to be easy to use, to obtain storage stability, and to not be inconvenient in use. CONSTITUTION: A water-soluble sheet for laundry(5) consists of a continuous portion (5a)and a discontinuous portion(5b) on surface thereof. The height of the discontinuous portion in the thickness direction is more varied than the height of the neighboring continuous portion. A manufacturing method of the water-soluble comprises: a step of preparing an embossing roller and a pressing roller which comprises embossing protrusions in outer circumference; and a step of forming a continuous portion and discontinuous portion in a sheet for laundry, which is formed by drying a mixture solution for laundry, by the pressing roller pressing the sheet to the embossing roller by enabling the sheet to pass through between the embossing roller and the pressing roller.

Description

Laundry sheet having continuing surface and discontinuing surface and, manufacturing methods for the laundry sheet formed with continuous and discontinuous surfaces

The present invention relates to a laundry sheet and a method for manufacturing the same, and more particularly, because the continuous surface and the discontinuous surface are formed, the laundry sheet does not stick to each other even if water is absorbed when a plurality of layers are stacked. The present invention also relates to a method for producing such a laundry sheet.

Powder detergent or liquid detergent has been used as a detergent used in a washing machine. In the case of liquid detergents, there is a disadvantage that consumers are reluctant to use them, and in the case of powder detergents, powders are blown when used, and the need for new types of detergents has been constantly raised.

In order to improve this problem, US Patent No. 4,605,509 discloses a technique for packaging a liquid detergent component and a fabric softener in a water-soluble film bag. However, when the fractional packaging using water-soluble polymer films, the sealing is broken during storage or transportation of the product, the contents leaked. In addition, the storage stability of the product, such as active ingredients seeping into the surface of the film was very low. In addition, the water-soluble film used as a packaging material is designed to have stability against the moisture in the air and durability of the contents, but it takes a considerable time to dissolve at low temperatures, and the residue of the film remains because it is not completely dissolved. This occurred.

In addition, although a laundry sheet for use by adsorbing a liquid detergent to the water-insoluble adsorption sheet has been developed, there has been a disadvantage in that the water-insoluble adsorption sheet has to be removed after washing.

In order to solve these problems, the applicant does not need to be completely dissolved in water and removed after washing, and the washing sheet has excellent washing performance, is easy to use, secures storage stability, and is not inconvenient in use. It has been developed and filed with Korean Patent Application Nos. 10-2011-0045255, 10-2011-0045256, 10-2011-0045257, 10-2011-0132083 and the like.

By the way, in the case where a plurality of the laundry sheets are laminated, there is a problem that the upper and lower laundry sheets stick to each other when the laundry sheet absorbs moisture.

The present invention has been made to solve the above problems, and since the continuous surface and the discontinuous surface is formed, it is an object of the present invention to provide a laundry sheet and a method for manufacturing the same, which do not stick to each other even if water is absorbed when stacked. have.

In order to solve the above problems, the laundry sheet according to the present invention is made by drying the laundry formula, characterized in that a plurality of embossing, that is, a continuous surface and a discontinuous surface is formed. The present invention relates to a laundry sheet having a continuous surface and a discontinuous surface, and a method for producing such a laundry sheet.

The laundry sheet preferably has the following composition, but is not limited thereto. The above composition, the process for obtaining the composition (experimental), and the excellent effect that such a composition has over other compositions will be described below.

The present invention provides a laundry sheet manufactured using a sheet-forming polymer, a cleaning surfactant, and the like, wherein the sheet-forming polymer is a polyvinyl alcohol or a polyvinyl alcohol-based copolymer, and a surfactant for a cleaning effect. It is possible to provide a laundry sheet comprising a non-aromatic surfactant free of ethylene oxide groups in the structure of the additive surfactant.

The washing film according to the present invention is (1) easily dissolved in low temperature water and exhibits excellent washing performance, (2) active ingredients of liquid do not come out of the sheet until it is put into the washing machine, and (3) departments used by consumers. Flexibility is exhibited while having a degree of tensile strength that is not supported, (4) it is not absorbed by moisture in the air, so it has distribution stability, and (5) it has excellent washing performance.

The present invention gelatin, pectin, dextran, hyaluronic acid, collagen, agar, gum arabic, acacia rubber, alginic acid, sodium alginate, methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose sodium, starch, dextrin, carboxymethyl Among various polymers such as starch, polyvinylpyrrolidone, polyvinyl methacrylate, polyacrylic acid, and polyethylene oxide, it is highly desirable to use polyvinyl alcohol or polyvinyl alcohol-based copolymer as a base material for forming a laundry sheet. Based on discovery.

That is, unlike other film forming substrates, polyvinyl alcohol or polyvinyl alcohol-based copolymers may maintain physical properties such as tensile strength of the film even when a large amount of active ingredients such as surfactants are contained in the matrix formed therein. The inventors have found that the present invention can contain a large amount of surfactant per unit area relatively within the physical properties required for sheet-type detergents, and can exhibit excellent washing performance even with the size of tissue products such as general wet tissues. It became.

In the laundry sheet of the present invention, in particular, among the polyvinyl alcohol or polyvinyl alcohol-based copolymers having various molecular weight and saponification degree, film forming, solubility, ease of manufacture, storage stability, washing performance, process (compound Viscosity) and the like, a polymer having a number average molecular weight of 10,000 to 100,000 is preferable, more preferably a polymer of 20,000 to 50,000 is used, even more preferably a polymer of 20,000 to 30,000 is used.

In addition, the saponification degree of the polyvinyl alcohol or polyvinyl alcohol-based copolymer was different from the saponification degree preferred for the purpose of the present invention depending on whether the polymer is a copolymer, whether or not an alkali builder is used. More specifically, when the polymer is polyvinyl alcohol and no alkali builder is used, the degree of saponification is preferably 80-90%, and the polymer comprises a comonomer of the following formula (1) or (2), which is a specific copolymer preferred according to the present invention. When the copolymer is used and an alkali builder is used, the degree of saponification is preferably 60-90%, more preferably 70-85%, and even more preferably 70-82%.

The present invention also provides a laundry sheet comprising a polymer, a surfactant, and an alkali builder, wherein the polymer is a polyvinyl alcohol-based copolymer including an anionic monomer unit having a carboxyl group, and the surfactant is a surfactant described later, preferably Provides a laundry sheet comprising an alkyl sulfate salt (preferably a lauryl sulfate alkali metal salt) having 8 to 18 carbon atoms.

Such a copolymer includes a vinyl alcohol monomer unit and an anionic monomer unit represented by the following Chemical Formula 1 or 2, and a copolymer having an anionic monomer unit content of 0.5-5 mol% is particularly preferable.

≪ Formula 1 >

<Formula 2>

In Formulas 1 and 2, R1, R2, and R3 are each independently H or methyl, and n is independently an integer of 0-3.

When PVA is used as the main formulation agent, there is a problem of being cured by alkali builders. When polyvinyl alcohol-based copolymer is used as a film forming substrate instead of PVA, film forming may be performed even if an alkali builder, which is one of washing active ingredients, is included. And the solubility is not deteriorated and the washing efficiency of the washing sheet can be improved. However, not all anionic monomers are preferable as such monomers for copolymers, and only anionic monomer-containing copolymers having a carboxyl group are preferable for the purposes of the present invention. For example, PVA copolymers having an anionic monomer having -SO ₃ H have been gelled by alkali builders, making it difficult to dissolve the sheet after sheet production.

In addition, very particularly, in the laundry sheet including the alkyl sulfate metal salt, alkali builder and PVA copolymer, the saponification degree of the PVA copolymer is preferably 60-90%, unlike PVA, more preferably 70-85%. Preferred, 70-82% even more preferred. Specifically, when the degree of saponification is too high, for example, when it exceeds 90%, there is a phenomenon that the solubility of the sheet is greatly reduced after the sheet is manufactured. When the degree of saponification is too low, for example, when the degree of water solubility of the copolymer is less than 60%, Degraded.

When the polyvinyl alcohol or the polyvinyl alcohol-based copolymer is used as a main material of the washing sheet, the present invention has a structure of the surfactant in particular among a wide variety of surfactants such as nonionic surfactants, anionic surfactants and amphoteric surfactants. The use of non-aromatic surfactants without ethylene oxide groups in the main surfactants is based on the surprising and unpredictable finding that it is highly desirable for the purposes of the present invention, such as film forming, cleaning performance, stability, and the like. In particular, among the non-aromatic surfactants without an ethylene oxide group in the structure of the surfactant, alkyl sulfate alkali metal salts having 8 to 18 carbon atoms are more preferable, lauryl sulfate alkali metal salts are even more preferable, and sodium lauryl sulfate is most preferred. Do.

Preferably, the main surfactant is contained at least 50% by weight, more preferably at least 60% by weight, even more preferably at least 70% by weight, based on the total surfactant weight.

When a large amount of ethylene oxide groups are incorporated in the surfactant structure, such as SLES (sodium lauryl ether sulfate) or EO-part nonionic surfactant, the film forming ability is very low. It is believed that this is due to the property of attracting the water molecules of the ethylene oxide structure itself, the solubility of polyvinyl alcohol in water, and the physical properties of the laundry sheet is lowered, but the present invention is limited to this theoretical guess no.

In addition, in the case of a surfactant having an aromatic group, such as linear alkylbenze sulphonate (LAS), when the sheet is prepared with polyvinyl alcohol, film forming ability and storage stability are very poor. When the surfactant containing an aromatic group is used as the main surfactant, good film properties are not exhibited due to poor compatibility with the polyvinyl alcohol or polyvinyl alcohol copolymer used as the film forming substrate.

Therefore, more preferably, the present invention provides a laundry sheet containing a polyvinyl alcohol polymer / copolymer and a surfactant, wherein the surfactant preferably contains a non-aromatic surfactant which is free of ethylene oxide groups in the structure, In the absence of such ethylene oxide groups, the non-aromatic surfactant is the main surfactant, which means that it is contained at least 50% by weight (more preferably 60% by weight, even more preferably 70% by weight) based on the total content of the surfactant. More preferred.

Non-aromatic ethylene oxide group-free surfactants used as the main surfactant include alkylsulfate salts of RSO ₄ ^- M ⁺ (M is an alkali metal, preferably sodium or potassium, most preferably sodium), α- Olefin sulfonates, alkanesulfonates alkali metal salts (preferably sodium salts), fatty acid methyl ester sulfonates alkali metal salts (preferably sodium salts), fatty acids, alkyl glycosides and the like can be used, and alkylsulfate salts are particularly preferred herein. Is preferred for various purposes, and surprisingly sodium lauryl sulfate is more preferred for various purposes, such as film forming of the present invention. It is preferable that carbon number of the alkyl or alkane contained in the said non-aromatic ethylene oxide group free surfactant structure is C8-C18, and it is preferable that a fatty acid is C8-C18.

Without being bound by theory, in the case of alkyl sulfate surfactants comprising saturated hydrocarbons of C8-C22 to preferably C8-C18, more preferably C12-C16, the polyvinyl alcohol polymer / copolymer as a film-forming substrate Due to its excellent compatibility with the surfactant, even if it contains a high content of the surfactant, it is assumed that the washing performance can be increased while forming a sheet formulation having good strength, and thus it is particularly preferable, but the present invention is not limited to this theoretical assumption.

Prepared using a polyvinyl alcohol polymer / copolymer and a surfactant (a non-aromatic surfactant without ethylene oxide groups as the main surfactant, which accounts for at least 50% by weight of the surfactant, more preferably at least 60% by weight). For dry laundry sheets, the total content of surfactant is 30 to 80% by weight (more preferably 40 to 70% by weight) relative to the total weight of the sheet (after drying), and the content of polyvinyl alcohol polymer / copolymer is It is preferred that it is 20-50% by weight (more preferably 30-50% by weight, even more preferably 35-50% by weight).

As shown in the experimental results described below, when the polyvinyl alcohol polymer / copolymer content is less than 35% by weight, the physical properties, or strength, of the sheet may be good, but the surfactant components may be buried depending on the storage conditions. In this case, the strength of the sheet may be significantly reduced along with the above problem, thereby causing a problem in use.

Such laundry sheets may include other additives, such as fluorescent dyes, enzymes, etc., which are described in detail below in addition to polyvinyl alcohol polymers / copolymers and surfactants. When the content of the surfactant is lower than the above range, the washing performance is lowered, and when the content of the surfactant is higher than the content, the content of the polyvinyl alcohol or the polyvinyl alcohol-based copolymer is inevitably reduced, making it difficult to prepare the sheet formulation.

Preferably, the present invention provides a laundry sheet containing a polyvinyl alcohol polymer / copolymer and a surfactant, wherein the surfactant is

(a) no primary groups of ethylene oxide in the structure with a surfactant, a non-aromatic surfactants (more preferably, RSO ₄ ^- alkyl sulfate salt with a carbon number of 8-18 having the formula M ⁺ (M = alkali metal, preferably Is sodium or potassium, most preferably sodium), even more preferably sodium alkyl sulfate, most preferably sodium lauryl sulfate)

(b) It provides a laundry sheet comprising a co-surfactant heptaoxyethylated lauryl alcohol (LA7), nonaoxyethylated lauryl alcohol (LA9) or a mixture thereof.

The present invention also provides a non-aromatic surfactant having no ethylene oxide group in its structure as a main surfactant in a laundry sheet prepared using a polyvinyl alcohol or polyvinyl alcohol copolymer and a surfactant as a laundry active ingredient (more preferred). Preferably an alkyl sulfate salt of 8-18 carbon atoms, even more preferably sodium alkylsulfate, most preferably sodium laurylsulfate, is a nonionic surfactant LA7 or LA9 (preferably LA7) as cosurfactant. Is based on the surprising finding that cleaning performance can be greatly improved while maintaining film formulation. Surprisingly, only LA7 or LA9 did not significantly degrade film formability or improved cleaning performance when other surfactants with good cleaning performance were mixed in the polyvinyl alcohol polymer / copolymer and laurylsulfate salt system.

Accordingly, the present invention also preferably provides only the lauryl sulfate salt (most preferably sodium salt) and LA7 / LA9 (preferably LA7), which are the main surfactants, as surfactants in the laundry sheet of the present invention. It provides a laundry sheet produced using.

Also preferably, the present invention provides a laundry sheet, characterized in that the mixing ratio (a: b) of (a) and (b) is 90:10 to 60:40, and more preferably, (a) The mixing ratio (a: b) of (b) is provided with a laundry sheet, characterized in that 80:20 to 70:30.

If too much of the auxiliary surfactant LA7 or LA9 is mixed with the sheet, the properties of the sheet may be worsened and the handling may be difficult. If too little is mixed, the improvement of cleaning performance is not significant.

As a result, the present invention is the polyvinyl alcohol or polyvinyl alcohol-based copolymer; Alkylsulfate salts (M is an alkali metal, preferably sodium or potassium, most preferably sodium), preferably alkyl having 8 to 18 carbon atoms represented by the main surfactant RSO ₄ ^- M ⁺ (preferably sodium alkylsulfate, More preferably sodium lauryl sulfate); And In the laundry sheet manufactured using LA7, LA9 or a mixture thereof as an auxiliary surfactant, the content of the polyvinyl alcohol or polyvinyl alcohol-based copolymer is 30 to 50% by weight relative to the total weight of the sheet after drying, The content of the lauryl sulfate salt as the main surfactant is 30 to 60% by weight, and the content of the auxiliary surfactant is 10 to 20% by weight.

The present invention is also based on the surprising finding that in formulations such as the present invention, it is desirable to substantially avoid the use of starch as the formulation agent (film forming substrate). As the starch was mixed with the formulation agent, that is, the starch was included as a sheet component, the surfactant floated after drying (poor compatibility), and as the starch content increased, the strength of the sheet also decreased. Furthermore, as the starch content increased, solubility also decreased.

Substantially not used in the present invention means no more than 5% by weight, preferably no more than 3% by weight, more preferably no more than 1% by weight, even more preferably no weight at all relative to the dry weight of the sheet.

Washing sheet according to the present invention, in order to improve the cleaning performance or film forming ability within the range that does not inhibit the film forming, storage stability, ease of manufacture, etc. of the sheet, fluorescent brightener; Enzymes (eg, cellulases, proteases, etc.); Alkali builders (e.g. sodium hydroxide, sodium carbonate, sodium bicarbonate, sodium metasilicate, sodium alkali silicate, neutral sodium silicate, sodium tripolyphosphate, sodium pyrophosphate, sodium borate, zeolite (sodium aluminosilicate), sodium sesquicarbonate) , MEA, TEA); Disintegrants / disintegrant aids (eg, starch, cellulose derivatives, sodium chloride, citric acid, glycerin, propylene glycol); Fibrous softeners (eg, cationic surfactants of quaternary ammonium salts, silicone fibrous flexible components); Bleach (eg, perborate, percarbonate, superphosphate, diacyl, tetraacylperoxide); Dispersants / emulsifiers (eg, polyoxy alkylene alkyl phenyl ethers, polyoxy alkylene alkyl ethers, polyoxy ethylene polyoxy propylene block polymers); Bactericidal / disinfectants (eg, sodium hypochlorite, hydrogen peroxide, urea peroxide); Spices; antiseptic; Pigment; It may further include an antimicrobial agent .

The thickness of the washing sheet according to the present invention is preferably 1 µm to 1 cm, more preferably 5 µm to 0.5 cm, and most preferably 50 µm to 1 mm. If the thickness of the dried laundry sheet is less than 1 μm, the loading of the active ingredient is insufficient, the strength of the film is weak, the desired performance is hard to be obtained, and if the thickness of the dried laundry sheet is more than 1 cm, the dissolution is slowed down and the washing performance is reduced. This may fall.

More preferably, the present invention provides 20-50% by weight of PVA (preferably 30-50% by weight), 30-50% by weight of SLS, 10-20% by weight of LA7 / 9, optionally fluorescence, relative to the total weight of the sheet after drying. A sheet water-soluble laundry detergent comprising 1 to 5 wt% of a bleach, and optionally 1 to 5 wt% of an enzyme is provided. The sheet-type laundry detergent of the present invention is completely dissolved when used together with clothes in a laundry container and does not require a removal process.

The washing sheet according to the present invention also comprises the above-mentioned polyvinyl alcohol or polyvinyl alcohol-based copolymers; Main surfactants described above; And other co-surfactants in addition to the above-described co-surfactants within a small amount not impairing the object of the present invention. Such a surfactant may further include a surfactant having an ethylene oxide group in the surfactant structure, and sodium laureth sulfate may be used as the surfactant having an ethylene oxide group in the structure.

The washing sheet according to the present invention also comprises the above-mentioned polyvinyl alcohol or polyvinyl alcohol-based copolymers; And in addition to the main surfactant, an aromatic surfactant may be further included as an auxiliary surfactant within a range that does not impair the object of the present invention. As the aromatic surfactant, an alkylbenzenesulfonate may be used, and the alkylbenzenesulfonate Alkyl is preferably linear alkyl having 8 to 18 carbon atoms.

The laundry sheet of the present invention may be used in a state in which two or more layers are integrated by stacking sheets of other layers in addition to the sheet of one layer according to the present invention.

The laundry sheet according to the present invention is prepared by dissolving a polyvinyl alcohol or a polyvinyl alcohol-based copolymer in an appropriate amount of water to prepare a polyvinyl alcohol polymer / copolymer solution, and then mixing other components such as surfactants well, and a predetermined thickness thereof. It can be prepared by drying the sheet of the product. In addition, the washing sheet of the present invention is not limited to the above-described manufacturing method, such that other components such as a surfactant may be dissolved first before the polyvinyl alcohol or polyvinyl alcohol-based copolymer is dissolved in water.

The present invention is also based on the fact that it is preferable to further include a bubbling process during the manufacturing process to improve the water solubility of the sheet of the present invention, and through such a bubbling process, When the specific gravity is adjusted to 0.6 to 0.9, various advantages for washing such as water solubility and dissolution rate of the sheet may be further highlighted. Therefore, the present invention comprises the steps of preparing a solution containing a polyvinyl alcohol or polyvinyl alcohol-based copolymer and a surfactant; Bubbling; And it provides a method for producing a laundry sheet comprising the step of drying.

The bubbling process generates a microbubble in the blend through a microbubble device or a homo-mixer, and by coating and drying the bubbling process, improves solubility by forming a microbubble in the laundry sheet. Figure 4 shows a general washing sheet and Figure 5 shows a washing sheet subjected to the bubbling process. It can be seen that the washing sheet subjected to the bubbling process contains many fine bubbles.

Accordingly, the present invention also provides the above-described technical characteristics, and a washing sheet in which the specific gravity of 0.6 to 0.9 is added thereto.

On the other hand, the washing sheet prepared through the bubbling process was cut into 5 cm × 5 cm and put into a 500 ml beaker about 300ml of 15 ℃ purified water and stirred at a constant speed. The time taken for the film to disintegrate completely and dissolve was measured and shown in the table below. As shown in the table below, it can be seen that the dissolution rate of the laundry sheet manufactured through the bubbling process is faster than the general laundry sheet.

< Example 1> Selection of a polymer suitable for a laundry sheet

The film forming, solubility, storage stability, and the like of the polymer were evaluated while preparing the laundry sheet using the various polymers according to Table 1 below. The results are shown in Table 1 below.

100 g of the polymer was dissolved or suspended in an appropriate amount of distilled water or ethanol (about 400 g) to obtain a polymer solution or suspension. The polymer solution or suspension was placed on a release film, and then manufactured to a predetermined thickness using a film applicator manufactured by Elcometer, and then dried for 10 minutes in a 115 ℃ drying oven to prepare a washing sheet (thickness: 0.01 cm). The film formulation was evaluated in three stages: good, normal and poor, using the sheet formation process and the sheets formed after preparation.

Solubility was evaluated as follows. The prepared film sheet was cut into 5 cm x 5 cm and charged into a 500 ml beaker at about 300 ml of 15 ° C. purified water, followed by stirring at a constant speed. The time taken for the film to disintegrate completely and dissolve was measured and evaluated in three stages: good (within 3 minutes), normal (3 minutes-5 minutes) and poor (greater than 10 minutes).

Film forming Solubility Other ratings Polyvinyl alcohol Great Great Good water solubility Polyacrylic acid usually Great Dissolves well in water at high pH and neutrality, but the formed film is brittle. Polyethylene glycol Bad usually - Polyacrylamide Bad Great - Polyvinylpyrrolidone Great Great Soluble in ethanol and organic solvents Poly ATC Great Great Very hygroscopic POLY DMAEMA Great usually Solubility is achieved at low pH POLY HEA Great usually - Cellulose (HEC) usually usually - Cellulose (HPMC) usually usually -

In Table 1, ATC means [2- (Acryloyloxy) ethyl] trimethylammonium chloride, DMAEMA means Dimethyl aminoehtyl methacrylate, HEA means hydroxy ethyl acrylate, HEC means hydroxyethylcellulose, and HPMC means hydroxypropylmethylcellulose. it means.

As shown in Table 1, polyvinyl alcohol was most preferred as a polymer for preparing a laundry sheet in terms of film forming, a solubility of the manufactured sheet, ease of manufacture, storage stability, and the like for manufacturing the laundry sheet. .

<Example 2> Evaluation of the effect according to the content and molecular weight of PVA

Also, polyvinyl alcohol having various molecular weights and saponification degrees was used to evaluate film forming, solubility, ease of manufacture, storage stability, the following washing performance, process (viscosity of the mixture), and the number average molecular weight was 10,000 to 100,000. Phosphorus polyvinyl alcohol or polyvinyl alcohol copolymer is preferred, more preferably a polymer having a molecular weight of 20,000 to 50,000 is used, and even more preferably, a molecular weight of 20,000 for the purposes of the present invention is taken into account in relation to the content used. PVAs of 3 to 30,000 or copolymers thereof are preferred. In addition, when alkali builders were not mixed in the saponification degree, the polymer had a saponification degree of 80-90%, and the saponification degree was 60-90% when the PVA copolymer was used and the alkali builders were mixed. Particular preference is given to using polymers, preferably 70-85%, even more preferably 70-82%). The water solubility was lowered when the saponification degree was lower than the saponification degree, and the gelling phenomenon was a problem when the polymer having the saponification degree higher than the saponification degree was used.

Specific experimental results showing the above contents are shown in Tables 3 and 4. Preparation and evaluation of the sheets were performed similarly to Example 1. At this time, the casting condition was 1100 ㎛ (mixing solution coating thickness), the drying condition was 115 ℃, 15 minutes. The film properties ("surface after drying"), including the burying scale, were scored and evaluated. For example, one point is a case where there is no abnormality in the film, but is buried on the surface, and three points mean a case where phase separation occurs on the surface of the film and is buried on the surface. Evaluation criteria of solubility and tensile strength were as shown in Table 2 below.

Evaluation results Very good Great usually Bad Solubility ◎
(Within 3 minutes) ○
(Within 5 minutes) △
(Within 10 minutes) ×
(More than 10 minutes) The tensile strength
(kgf / cm ² ) ◎
More than 15 ○
over 10 △
5 or more ×
5 or less

When the content of the polymer is changed, the total solids (PVA, SLS, LA7, etc.) content is adjusted to 100% by supplementing or reducing the surfactants (SLS, LA7) and other components (fluorescent brightener, enzyme, fragrance, etc.) The content was fixed at 5% by weight. The basic formulation used 40 wt% PVA, 45 wt% SLS, 10 wt% LA7 and 5 wt% other ingredients (prescription number 1). In the following table, PVA content refers to the weight percentage of PVA in the total solids excluding water, and the content of water means the weight% of water relative to the total weight of solids when preparing the blend. That is, in the formulation 1, 40% of PVA content means that 40% by weight of PVA is included in the total solids, and 63% of water content is 37% of solids and 63% of water in the formulation for preparing the sheet. Therefore, when the solid content is 100, the content of water is about 170.

As shown in Tables 3 and 4, when the PVA number average molecular weight was about 15,000 or less, a phenomenon in which the sheet strength was poor and the surface surfactant floated after drying occurred (poor compatibility). In order to solve this, it is possible to secure the sheet forming and strength by increasing the PVA content in the sheet, but the lower the effective content content has resulted in a lower washing performance.

On the other hand, as the molecular weight increased, the sheet surface became more stable (compatibility improvement), and the sheet strength increased. Therefore, the higher the molecular weight, it is advantageous to secure the sheet formulation at a lower PVA content, but the viscosity of the formulation is too high, it is difficult to secure a fairness substantially suitable for mass production. On the other hand, to improve this, that is, to increase the water content in order to lower the viscosity can be produced, but the problem that the productivity is greatly reduced.

 Therefore, as a result, the number average molecular weight of the PVA or copolymer thereof used in view of sheet strength and compatibility with the laundry active ingredient is preferably 20,000 or more. In addition, the number average molecular weight of the PVA or its copolymer is preferably 50,000 or less, and preferably 30,000 or less, in terms of the manufacturing process, since 5,000 cps or less is appropriate in a certain PVA content (about 30%) and water content (240 wt% based on the solid content). It was more preferable that it was the following.

In this regard, the molecular weight of the PVA is increased when 30 wt% PVA, 52 wt% SLS, 13 wt% LA7 and 5 wt% of other components are used and water is used at 240 parts by weight relative to 100 wt% sheet solids. While measuring the viscosity of the polymer solution changes while the results are shown in FIG. In the case of the polymer solution to be used during the manufacturing process is not preferable if the viscosity is too high or too low, the polymer solution having a component of the same type of the present invention was found to increase the viscosity rapidly from about 50,000 molecular weight.

For reference, the measurement results of changes in sheet tensile strength according to molecular weight, PVA content, and water content relative to solid content are shown in FIG. 1. At least 5 kgf / cm ² (easily torn or broken) is required in terms of sheet usability, and at 10 kgf / cm2 or above, it was considered to be a good level. , 10-40-170 prescription, 15-30-200 prescription, 10-40-200 prescription, 15-40-240 prescription, 10-30-200 prescription, 10-35-200 prescription and the like were preferred.

Example 3 Selective Evaluation of Main Surfactant

According to the ingredients and contents shown in Table 5 below, a sheet for washing was prepared, and the film forming and washing performance of the prepared sheet were compared and evaluated.

number ingredient Content (unit%) One Polyvinyl Alcohol (PVA) 40% 2 Surfactants of Table 3 below 55% 3 Fluorescent brightener 2 % 4 enzyme 1.5% 5 Incense and more 1.5%

Specifically, 145 g of PVA (blackness: 86.5%, average degree of polymerization: 500) were added to 630 g of distilled water, and then dissolved at 80 ° C. for 2 hours to prepare a PVA solution. The remaining components of Table 2 were added to the prepared PVA solution, followed by mixing using a mechanical stirrer. The mixed solution was placed on a release film, and then prepared to a predetermined thickness using an Elcometer film applicator, followed by drying for 10 minutes in a 115 ℃ drying oven to prepare a PVA sheet containing a surfactant as a washing component.

Evaluation results of film forming, washing performance, etc. according to the type of surfactant are shown in Table 6 below. Film formulation was evaluated in three steps of good, normal and poor as in Example 1 above. The cleaning performance was evaluated by the method given below, and the cleaning power was judged to be excellent when the cleaning power was 60% or more, 50-59% is normal, and less than 50% was poor.

Specifically, the washing power was evaluated by using a washing machine under the same conditions, and at this time, general tap water was used as the washing water. In addition, the temperature of the washing was cold water was the same as the conditions used in normal households, and the emulsified cloth used for the evaluation of cleaning power was used as the artificial wet cloth and protein contaminant EMPA 116 manufactured by the Japan Laundry Science Association. In addition, the soil cloth was evaluated by attaching to the actual cotton t-shirt. In addition, 16 contaminated cloths of 5 cm × 5 cm size were used for comparative evaluation. At this time, the W _B value which is the value which shows the whiteness of a contaminated cloth was measured using the color difference meter before and after washing. The laundry sheet prepared in the above example was cut to a size of 20 cm × 15 cm, and two pieces of the detergent thus cut were used. In the initial stage of washing, the laundry sheets prepared in the examples were put together with the contaminated cloth, and the washing conditions were performed at a medium water level in a standard course of the washing machine (20 minutes of washing and two rinsing cycles). It was dried for 1 day at 25 ℃, 20% RH), and ironed to measure the WB value by the same colorimeter. The obtained result was substituted into the Kubelka Munch equation represented by Equation 2 to calculate the washing power, and the results are shown in Table 6 below.

In Equation 1, Rs represents the surface reflectance of the contaminated cloth, Rc represents the surface reflectivity of the contaminated cloth after the washing process, and Ro represents the surface reflectance of the white cotton cloth.

Kinds designation Film forming Washing performance Remarks Nonionic surfactant Pentaoxyethylated lauryl alcohol (LA5)
(Polyoxyethylene Lauryl Ether) Bad usually Liquid LA7 (heptaoxyethylated lauryl alcohol) Bad Great Liquid LA9 (nonaoxyethylated lauryl alcohol) Bad Great Liquid LC-7 (Laureth-7-citrate) Bad usually Liquid CA7 (Polyoxyethylene cetyl ether) Bad usually Semisolid CA9 Bad usually Semisolid CA15 usually usually Semisolid SA14 (Polyoxyethylene stearyl ether) usually usually Semisolid OA14 (Polyoxyethylene oleyl ether) usually usually Semisolid AG200 (Alkyl glucoside) usually usually 50% solution Coconut Acid Monoethanol Amide (C-MEA) usually Bad elegance Anionic surfactant SLES 2 (sodium laureth sulfate) Bad Great 70% solution SLES 3 Bad Great 70% solution SLS (sodium lauryl sulfate) Great Great elegance SAS (Sodium alkanesulfonate) Bad usually 25% solution Ammonium Lauryl Sulfate (ALS) Bad usually 26% solution AOS (Alpha Olefin sulfonate) Bad Great 35% solution ALES 3mol (Ammonium Laureth Sulfate) Bad Great 30% solution Linear alkylbenze sulphonate (LAS) -mono ethanol amine (MEA) Bad usually Semisolid LAS-Na (Soduim linear alkylbenze sulphonate) Bad usually Semisolid Lauric acid-K (Potassium Laurate) Bad Bad elegance Myristic acid-K (Potassium Myristrate) Bad usually elegance MES (methyl ester sulfonate) Bad usually elegance Amphoteric surfactant Amine-oxide Bad Bad 30% solution Cocamidopropyl Betaine usually Bad elegance

As shown in Table 6, when using polyvinyl alcohol as a polymer substrate, only sodium lauryl sulfate (SLS) was excellent in film formability, and various other cleaning surfactants had moderate or poor film formability. It was. For example, surfactants such as LAS, SLES, and MEA did not have good compatibility with PVA due to phase separation in the manufacturing process, and poor storage stability and ease of handling such as sticky or broken sheets. .

Example 4 Selective Evaluation of Cosurfactants

Sodium lauryl sulfate was used as the main surfactant, and various nonionic surfactants were used as auxiliary surfactants to prepare and evaluate various laundry sheets according to the formulation of Table 7 below. Laundry sheets were prepared in a similar manner to Example 3.

Item Example a b c d e f g h i j k Polymer
matrix PVA ⁽¹⁾ 40 40 40 40 40 40 40 40 40 40 40 Nonion
Surfactants LA5 15 - - - - - - - - - - LA7 - 15 - - - - - - - - - LA9 - - 15 - - - - - - - - LC7 - - - 15 - - - - - - - CA7 - - - - 15 - - - - - - CA9 - - - - - 15 - - - - - CA15 - - - - - - 15 - - - - SA14 - - - - - - - 15 - - - OA14 - - - - - - - - 15 - - AG200 - - - - - - - - - 15 - C-MEA - - - - - - - - - - 15 Anion
Surfactants SLS ⁽²⁾ 40 40 40 40 40 40 40 40 40 40 40 additive Fluorescent Dyes ⁽³⁾ 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 enzyme 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 Incense and more 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 Sum Sum 100 100 100 100 100 100 100 100 100 100 100

In Table 7, PVA ⁽¹⁾ means polyvinyl alcohol having a degree of saponification of 86.5% and an average degree of polymerization of 500, SLS ⁽²⁾ is sodium lauyl sulfate, and fluorescent dye ⁽³⁾ is Tinopal CBS-X (Ciba Specialty). Chemical).

The prepared laundry sheets were tested in the same manner as in Example 1 or 3, and evaluated according to the criteria of Table 8 below, and the results are shown in Table 9 below.

Film tensile strength was evaluated as follows. The test method followed the ISO 527-3 standard test method, using a Zwick 1120 universal tester. Each sample was prepared to be 0.2mm thick and cut into 2 × 10 (cm ² ), and the specimen was held by screw grip. The distance between grips was maintained at 50mm and the tension test was performed at a speed of 20 mm / min. It was. The point at which the film was cut without breaking the force was set as the tensile strength, and was considered based on the numerical values of Table 8 in consideration of ease of use.

Evaluation results Very good Great usually Bad Solubility ◎
(Within 3 minutes) ○
(Within 5 minutes) △
(Within 10 minutes) ×
(More than 10 minutes) The tensile strength
(kgf / cm ² ) ◎
More than 15 ○
over 10 △
5 or more ×
5 or less

Example a b c d e f g h i j k Cleaning power (%)
(Japan Laundry Science Association) 60 71 70 64 58 66 64 67 62 68 58 Cleaning power (%)
(Protein contaminants, EMPA 116) 66 68 67 68 64 66 65 68 60 62 56 Solubility ◎ ◎ ◎ ◎ ○ ○ ○ ○ ○ ○ ○ The tensile strength ○ ◎ ◎ ○ ◎ ◎ ◎ ◎ ○ ○ ◎

As shown in Table 9 above, LA7 and LA9 were superior to other nonionic surfactants in terms of washing power and physical properties, and LA7 was somewhat superior to LA9 in terms of washing power.

<Example 5> Effect evaluation according to the SLS content of the main surfactant and LA7 content of the auxiliary surfactant

As shown in Table 10, the washing sheet was prepared while varying the contents of the main surfactant SLS and the auxiliary surfactant LA7. The preparation method was the same as in Example 4.

Ingredient / Content (% by weight) Example 5-1 Example
5-2 Example
5-3 Example
5-4 Example
5-5 Example
5-6 Polyvinyl Alcohol (PVA) 40% 40% 40% 40% 40% 40% Sodium lauryl sulfate 55% 50% 45% 40% 35% 30% LA7 0% 5% 10% 15% 20% 25% Fluorescent dyes (Tinopal CBS-X, Ciba chem.) 2% 2% 2% 2% 2% 2% Enzyme (Savinase-16L, Novozyme) 1.5% 1.5% 1.5% 1.5% 1.5% 1.5% Incense and more 1.5% 1.5% 1.5% 1.5% 1.5% 1.5% Sum 100% 100% 100% 100% 100% 100%

The film forming, washing performance and the like of the thus prepared laundry sheet were evaluated in the same manner as in the evaluation method of Example 4, and are shown in Table 11 below.

Sample Film forming Cleaning performance (%) Japanese pollution gun EMPA116 Example 5-1 Great 65 55 Example 5-2 Great 67 58 Example 5-3 Great 69 62 Example 5-4 Great 71 68 Example 5-5 usually 72 66 Example 5-6 Bad 68 60

As shown in Table 11, considering the film formulation and washing performance, the content of SLS is 40 to 50% by weight relative to the total weight of the sheet, and 5 to 15% by weight of LA7, which is a nonionic surfactant, is preferable.

Example 6 Overall Evaluation

To prepare a water-soluble sheet in the formulation and content of Table 12 below to evaluate various aspects. The preparation method was the same as in Example 4.

Item Example Comparative example a b c d e f g h i j k l a b c Polymer
matrix PVA 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 Nonion
Surfactants LA7 0 5 10 15 20 25 15 15 15 15 - - 55 - - Anion
Surfactants SLS 55 50 45 40 35 30 30 20 10 0 57 56.5 - - - SLES - - - - - - 10 20 30 40 - - - 55 - AOS - - - - - - - - - - - - - - 55 additive Fluorescent dyes 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 0 2.0 2.0 2.0 2.0 enzyme 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 0 1.5 1.5 1.5 Incense and more 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 Sum Sum 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100

In Table 12, PVA having a saponification degree of 86.5% and an average degree of polymerization of 500 was used as PVA, and LA7, which is a polyoxyethylene alkyl ether, was used as a nonionic surfactant, and AOS means α-olefin sulfonate, and a fluorescent dye. Tinopal CBS-X (Ciba Specialty Chemical) was used as the furnace.

Sheet forming evaluation

Formulation properties of the water-soluble sheet detergent prepared in Comparative Examples and Examples were evaluated according to the following criteria through visual observation, and the results are shown in Table 13 below.

◎: Sheet formulation is flexible and excellent without any bleeding phenomenon

○: The sheet formulation is flexible, but the liquid component is slightly buried.

(Triangle | delta): The sheet | seat flexibility lacks and the phenomenon which a little burrs occurs.

X: Sheet formulation was not carried out and a lot of liquid components were buried.

Example Comparative example a b c d e f g h i j k l a b c Sheet forming ◎ ◎ ◎ ◎ ○ △ ○ ○ △ △ ◎ ◎ × △ ×

As shown in Table 13, the sheet formulation of Examples a, b, c, d, k and l was excellent, and it was confirmed that the film formulation was significantly degraded when the nonionic surfactant and the SLES content were increased.

Solubility and Tensile Strength Evaluation

The laundry sheets prepared in Examples and Comparative Examples were tested in the same manner as in Example 4 to evaluate solubility and tensile strength. The writing results are shown in Table 14 below.

Example Comparative example a b c d e f g h i j k l a b c Solubility ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ○ ○ ◎ ◎ - ○ - The tensile strength ◎ ◎ ◎ ◎ ○ ○ ○ ○ ○ △ ◎ ◎ - △ -

In Comparative Examples a and c, the sheet formulation was not formed, so it was impossible to measure solubility and tensile strength.

As shown in Table 14, in Examples a, b, c, d, k and l, both solubility and tensile strength were very excellent.

Detergency Evaluation

The cleaning power of the laundry sheets prepared in Examples and Comparative Examples which can be manufactured as a laundry sheet was evaluated by the following method (Comparative Examples a and c were evaluated by the same amount of the active ingredient formulation instead of the water-soluble detergent sheet).

Specifically, the washing power was evaluated by using a washing machine under the same conditions, and at this time, general tap water was used as the washing water. In addition, the temperature of the washing was cold water was the same as the conditions used in normal households, and the emulsified cloth used for the evaluation of cleaning power was used as the artificial wet cloth and protein contaminant EMPA 116 manufactured by the Japan Laundry Science Association. In addition, the soil cloth was evaluated by attaching to the actual cotton t-shirt. In addition, 16 contaminated cloths of 5 cm × 5 cm size were used for comparative evaluation. At this time, the WB value which is the value which shows the whiteness of the contaminated cloth was measured using the color difference meter before and after washing. The laundry sheet prepared in the above example was cut to a size of 20 cm × 15 cm, and two pieces of the detergent thus cut were used. In the initial stage of washing, the washing sheet and detergent were put together with the contaminated cloth, and the washing conditions were performed at the medium water level in the standard course of the washing machine (20 minutes of washing and two rinsing cycles), and the dehydrated contaminated cloth was placed in a constant temperature and humidity room (25 ° C). , 20% RH) was dried for 1 day, and ironed to measure the W _B value using the same colorimeter. The obtained result was substituted into the Kubelka Munch type | mold same as Example 3, and washability was computed. The results are shown in Table 15 below.

Example Comparative example a b c d k l a b c Cleaning power (%)
(Japan Laundry Science Association) 65 67 69 71 55 58 72 64 60 Cleaning power (%)
(Protein contaminants, EMPA 116) 55 58 62 68 52 50 48 66 62

As shown in Table 15 above, 15% by weight of polyoxyethylene alkyl ether, which is a nonionic surfactant, is contained in Examples a, b, c, d, k, and l having proper sheet forming, solubility and tensile strength. The washing performance of example d was the best.

Example 7 Evaluation of Stability (Hygroscopicity)

The stability of the laundry sheet prepared in Example d of Example 6 was evaluated, and the results are shown in Table 16 below.

After 1 month Two months later Remarks Dry residue Film status Dry residue Film status Room temperature 96% Good 96.5% Good Moisture in the sheet dries, making the sheet brittle, but there is no significant difference in solubility. 50 degrees 97% Good 97.5% Good Freeze / Thaw
(cycle: -15 ~ 50 ℃) 95.5% Good 96% Good Almost no change from the initial state. 30 degree, 80% humidity 94.5% Good 94% Good It feels a bit damp, but it doesn't get on your hands, is not sticky, and the film is slightly soft. daylight 96% Good 96.5% Good Similar to room temperature

The initial sheet drying residue was 95% by weight, the moisture content was 5% by weight, and the drying residue was measured after drying for 10 minutes at 105 ℃ using a Halogen moisture analyzer.

As shown in Table 16, despite being a water-soluble sheet detergent, it was possible to secure stability as a product under various conditions including hot and humid rainy season conditions.

Example 8 Evaluation of PVA Copolymer Use

To prepare a laundry sheet in accordance with the prescription of Table 17, the manufacturing method was the same as in Example 4.

Item Example a b c d e f g h i Polymer
matrix PVA ⁽¹⁾ 40 40 - - - - - - - PVA copolymer ⁽²⁾ - - 40 40 40 40 40 40 40 Nonion
Surfactants LA7 15 13.5 15 14.3 13.6 13.0 12.3 11.6 10.9 Anion
Surfactants SLS ⁽³⁾ 40 36.4 40 38.2 36.4 34.5 32.7 30.9 29.1 additive Builders ⁽⁴⁾ - 5 - 2.5 5 7.5 10 12.5 15 Fluorescent Dyes ⁽⁵⁾ 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 enzyme 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 Incense and more 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 Sum Sum 100 100 100 100 100 100 100 100 100

In Table 17, PVA ⁽¹⁾ means polyvinyl alcohol having a degree of saponification of 86.5% and an average degree of polymerization of 500, and PVA copolymer ⁽²⁾ refers to vinyl alcohol (98 mol%, saponification: about 77 mol%)-methacrylic acid ( 2 mol%) was used as a copolymer having an average degree of polymerization of 500, SLS ⁽³⁾ is sodium lauyl sulfate, sodium carbonate (soda) as builder ⁽⁴⁾ , Tinopal CBS-X as fluorescent dye ⁽⁵⁾ (Ciba Specialty Chemical) was used.

The manufactured laundry sheets were evaluated in the same manner as in Example 4, and the results are shown in Table 18 below.

Example a b c d e f g h i Cleaning power (%)
(Japan Laundry Science Association) 71 64 70 70 72 71 68 66 64 Cleaning power (%)
(Protein contaminants, EMPA 116) 68 60 67 69 72 76 74 72 68 Solubility ◎ X ◎ ◎ ◎ ◎ ◎ ◎ ◎ The tensile strength ◎ △ ◎ ◎ ◎ ○ ○ △ △

As shown in Table 18, when the builder is added to the PVA, the PVA is cured so that the solubility and physical properties are drastically reduced, and the washing performance is also ineffective due to the insoluble component. However, when the PVA-copolymer is used, the addition of the builder does not cause hardening, and thus the washing power is improved by the builder, and above a certain concentration, the effect is offset by the washing power reduction due to the decrease of the relative surfactant amount. In addition, the sheet strength was reduced by the large amount of builders in the film when the amount of builders was 7.5% or more.

Example 9 Evaluation of Effect by Addition of Starch

To prepare a sheet having a prescription as shown in Table 19, using the PVA, starch or a mixture thereof as a formulation agent was evaluated the effect of the addition of starch. The results were evaluated in the same manner as in Example 2, and are shown in Table 20, and the tensile strength of the results in Table 20 is shown in FIG.

Raw material content One Formulation Agent 40% 2 SLS 45% 3 LA7 10% 4 Etc 5% water 170 (seat solid content 100)

Formulation Agent
PVA / starch
(total 40%) Casting after drying
surface Solubility The tensile strength
(kgf / cm ² ) Remarks A 1/0 Good Good ◎ 10.7 (○) B 3/1 Good Floating phenomenon (3 points) X (Hazy) 6 (?) Starch powder sinks 3/1 (starch) Good Floating phenomenon (3 points) ◎ 5.3 (△) C 2/1 Good Floating phenomenon (4 points) X (Hazy) 4.1 (X) Starch powder sinks 2/1 (starch) Good Floating phenomenon (4 points) ◎ 4.1 (X) D 1/1 Good Floating phenomenon (4 points) X (Hazy) 2 (X) Starch powder sinks 1/1 (starch) Good Floating phenomenon (4 points) Δ 2.1 (X) Some residue left

As shown in Table 20 and FIG. 2, as the starch is mixed and used as a formulation agent, that is, as the starch is included as a sheet constituent, a phenomenon in which the surfactant floats after drying (poor compatibility) is increased, and the starch content is increased. The strength of the sheet also decreased with the increase. Furthermore, as the starch content increased, solubility also decreased. Therefore, it was understood that it is preferable not to use starch while manufacturing the laundry sheet as in the present invention. In order to overcome the compatibility and tensile strength problems, there is a problem in that the content of the formulation agent in the sheet (50% or more) increases, and in order to improve solubility, starch must first be gelatinized.

The present invention has the following effects.

First, in the case where a plurality of layers are stacked, a continuous sheet and a discontinuous surface (embossing) are formed even when absorbing moisture, thereby providing a washing sheet that does not stick to each other.

Secondly, it is completely dissolved in water and does not need to be removed after washing, and provides excellent washing performance, ease of use, storage stability, and no inconvenience in use.

Third, to provide a laundry sheet manufacturing method having the same effect as above.

The present invention will be described in detail with reference to the following drawings, but these drawings illustrate preferred embodiments of the present invention, and thus the technical spirit of the present invention should not be construed as being limited to these drawings.
1 is an experimental result showing the change in sheet tensile strength according to the PVA molecular weight, PVA content and water content compared to the solid content. In the X axis value “03-40-170” of FIG. 1, the first number means degree of polymerization / 100 (ie, 03 means degree of polymerization 300), and the second number means content of PVA (% by weight). , The third number refers to the water content (% by weight) relative to solids. PVA molecular weight is approximately 50 times the degree of polymerization. Y-axis means tensile strength and the unit is kgf / cm ² .
Figure 2 is a result showing the change in tensile strength caused by replacing part of the PVA used as a formulation agent with starch. The Y-axis values in the graph refer to the tensile strength and the unit is kgf / cm ² . The red line in FIG. ² is the boundary line showing 5 kgf / cm ² , which is the minimum tensile strength required (in case of less than it is easily torn or broken) in terms of sheet usability.
3 is a graph showing the viscosity that changes as the molecular weight of PVA increases under specific content conditions. At this time, the water content of each formulation is 240% of solids.
Figure 4 is a photograph showing a washing sheet not subjected to the bubbling process.
5 is a photograph showing a washing sheet subjected to a bubbling process.
6 is a block diagram showing an apparatus for manufacturing a laundry sheet according to the first embodiment of the present invention.
7 is a cross-sectional view showing an embossing roller and a pressure roller provided in the washing sheet manufacturing apparatus of FIG.
8 is a perspective view showing the embossing roller of FIG.
9 is a plan view showing a laundry sheet manufactured according to the first embodiment of the present invention.
10 is a cross-sectional view showing yet another coating means that can be provided in the laundry sheet manufacturing apparatus of FIG.
11 is a block diagram showing an apparatus for manufacturing a laundry sheet according to a second embodiment of the present invention.
12 is a plan view showing a part of a release film provided in the laundry sheet manufacturing apparatus of FIG.
Figure 13 (a) to Figure 14 (b) is a cross-sectional view showing a cross-section of the laundry sheet manufactured according to the second embodiment of the present invention, respectively.
15 is a block diagram showing an apparatus for manufacturing a laundry sheet according to a third embodiment of the present invention.
16 is a plan view showing a part of the embossed belt provided in the laundry sheet manufacturing apparatus of FIG.
17 is a perspective view showing an apparatus for manufacturing a laundry sheet according to a fourth embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined. Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

The present invention relates to a laundry sheet on which embossing is formed and a method of manufacturing such a laundry sheet. The laundry sheet may be made by the laundry blending solution described in the 'Measuring Solution', and below, a method of manufacturing a laundry sheet having a continuous surface and a discontinuous surface using such a laundry blending liquid, and The washing sheet made by this method will be described.

On the other hand, the washing sheet according to the present invention is composed of a continuous surface and a discontinuous surface, the discontinuous surface is formed by being surrounded by the continuous surface, the discontinuous surface is different in height in the thickness direction compared to the surrounding continuous surface. For example, the discontinuous surface may be a groove or protrusion formed in the laundry sheet. Since the laundry sheet according to the present invention is composed of such a discontinuous surface and a continuous surface, it can be prevented from adhering to each other even when a plurality of sheets are stacked.

6 is a block diagram showing an apparatus for manufacturing a laundry sheet according to a first embodiment of the present invention.

Referring to the drawings, the washing sheet manufacturing apparatus 100 is a release film supply roll 110, the coating means 120 for coating the laundry formulation on the release film 1, and the coated laundry formulation The drying member 130 for drying the resin, and the separating rolls 140 and 142 for separating the washing sheet 5 formed by drying the washing compound from the release film 1 and the washing sheet 5. An embossing roller 150 and a pressure roller 155 for forming the embossing are provided.

The release film supply roll 110 is a roll in which the release film 1 was wound. The release film 1 wound on the release film supply roll 110 is moved toward the coating means 120. A guide roll 141 may be provided between the release film supply roll 110 and the coating means 120. The guide roll 141 may be rotated by a motor (not shown).

As the release film 1, paper, polyethylene (PE), polyethylene terephthalate (PET), or the like may be used.

The coating means 120 coats the laundry formulation on the release film 1. The laundry formula may be made of the composition described in the Solution to the Problem, but is not necessarily limited thereto. The coating means 120 is coated by a comma coating method. The comma coating method can be effectively used in the present invention because it is suitable for coating high-viscosity liquids such as laundry formulations and coatings of 100 μm or more. On the other hand, the coating may be made by a slot die coating method (slot die coating), the slot die coating method will be described below.

The coating means 120 is a storage container 121 for storing the laundry mixture, a coating roll 122 installed on the storage container 121 so as to be rotatable, and an interval provided with the coating roll 122 at predetermined intervals. Ash 123 is provided. Coating roll 122 may be rotated by a drive motor (not shown).

The release film supplied from the release film supply roll 110 is coated by a washing compound while moving on the coating roll 122, and the coated release film 1 is spaced apart from the coating roll 122. Discharged through gaps between the ashes 123.

The drying member 130 is dried by heating the laundry mixture coated on the release film (1). Preferably, the drying member 130 is dried at approximately 60-140 ℃, the drying at less than 60 ℃ is not economical due to the drying speed is too slow and if the drying at a temperature exceeding 140 ℃ surfactant and sheet formulation agent Phase separation between (PVA) occurs resulting in deterioration (poor) of sheet formulation.

The drying member 130 may include a frame 131 having a sealed inner space, an inlet 132 and an outlet 133 formed at both sides of the frame 131, and a heater (not shown) installed in the inner space. Equipped. The release film 1 coated with the washing compound is introduced into the inner space through the inlet 132, heated and dried by the heater, and then discharged through the outlet 133.

The heater may be used as the heater. In addition, a hot air fan for supplying hot air may be used as an alternative to the heater.

Separation rolls 140 and 142 are installed at the rear of the drying member 130, and separates the washing sheet 5 made by drying the laundry mixture from the release film 1. Separation rolls 140 and 142 include an upper roll 140 and a lower roll 142. The release film 1 is wound around the winding roll 146 after passing through the lower roll 142 and the guide roll 144. The laundry sheet 5 is separated from the release film 1 and then moved to the embossing roller 150.

As shown in FIGS. 7 and 8, the embossing roller 150 and the pressure roller 155 cooperate with each other to form an embossing, that is, a continuous surface and a discontinuous surface on the washing sheet 5.

The embossing roller 150 includes an embossing protrusion 151 formed on its outer circumferential surface, and the pressure roller 155 includes an embossing groove 156 formed on its outer circumferential surface. The embossing protrusion 151 and the embossing groove 156 are formed to correspond to each other when the embossing roller 150 and the pressure roller 155 rotates. That is, the embossing protrusion 151 and the embossing groove 156 are formed such that the embossing protrusion 151 is inserted into the embossing groove 156 when the embossing roller 150 and the pressure roller 155 rotate.

Accordingly, when the washing sheet 5 is inserted between the embossing roller 150 and the pressure roller 155, the washing sheet 5 is pressed by the embossing protrusion 151 to be inserted into the embossing groove 156, thereby discontinuous surface is formed. It is formed in the washing sheet 5.

9 shows the washing sheet 5 passed through the embossing roller 150 and the pressure roller 155. The washing sheet 5 is provided with a continuous surface 5a and a discontinuous surface 5b. The continuous surface 5a surrounds the discontinuous surface 5b, in this case, a groove.

On the other hand, the washing sheet manufacturing apparatus 100 according to the present invention may be provided with a cutting unit (not shown in the figure) installed in the rear (+ x direction) of the embossing roller 150.

The cutting unit may include cutters (not shown in the drawing) installed at predetermined intervals for cutting the laundry sheet 5 along the longitudinal direction. When the washing sheet 5 is moved rearward (+ x direction) while the cutter is fixed, the washing sheet 5 is slitting at the predetermined intervals. On the other hand, such slitting may be made manually by an operator.

After the slitting, the slitting laundry sheet 5 may be cut to a predetermined length in the longitudinal direction and loaded after a predetermined number of sheets.

On the other hand, Figure 10 shows that the coating coating for the laundry solution to the release film using another coating means. The same reference numerals as those in FIGS. 1 to 9 in FIG. 10 denote the same elements.

The coating means 120a is coated using a slot die coating method. The coating means 120a is provided with a die 126 in which a moving passage 125 of the laundry blend is formed. The release film 1 is wound on the coating roll 126 and moved, and the washing compound is coated on the release film 1 after being supplied through the moving passage 125. Coating roll 126 may be rotated by a drive motor (not shown in the figure).

11 is a block diagram showing an apparatus for manufacturing a laundry sheet according to a second embodiment of the present invention, Figure 12 is a plan view showing a part of a release film provided in the laundry sheet manufacturing apparatus. 11 and 12, the same elements as those in FIGS. 1 to 10 denote the same elements.

Referring to the drawings, the washing sheet manufacturing apparatus 200 is a release film supply roll 110, the coating means 120 for coating the laundry formulation on the release film 2, and the coated laundry formulation It is provided with a drying member (130) for drying the separation roll (140) (142) for separating the washing sheet (5) made by drying the laundry formula liquid from the release film (2).

Among the components, the coating means 120, the drying member 130, and the separation rolls 140 and 142 are the coating means 120, the drying member 130, and the separation rolls 140 and 142 of the first embodiment. Since each is the same, a description thereof will be omitted.

The release film supply roll 110 is a roll in which the release film 2 was wound. Embossing grooves or protrusions 2a are formed on at least an upper surface of the release film 2. The embossed grooves or protrusions 2a have a depth and diameter such that embossing can be formed on the washing sheet 5 formed by coating the washing compound on the release film 2.

When the embossed groove is formed in the release film 2, a discontinuous surface, which is a protrusion, is formed on the washing sheet, and a continuous surface is formed to surround the discontinuous surface. On the other hand, when the embossing projection is formed on the release film 2, a discontinuous surface which is a groove is formed in the washing sheet, and a continuous surface is formed to surround the discontinuous surface.

As shown in Figs. 13A and 13B, when the discontinuous surface 5b is a groove, the ratio t1 / t2 of the thickness t2 of the discontinuous surface 5b and the thickness t1 of the continuous surface 5a. ) Is preferably 1.01 to 5. Figure 13 (a) shows a case where the discontinuous surface is formed on one side of the laundry sheet, Figure 13 (b) shows a case where the discontinuous surface is formed on both sides of the laundry sheet, forming the discontinuous surface on both sides is embossed It can be made by adjusting the relative position of the embossing projection 151 of the roller 150 and the embossing groove 156 of the pressure roller 155, and the distance between the embossing roller 150 and the pressure roller 155.

On the other hand, when the discontinuous surface 5b is a groove, a groove (hole) may be formed in the groove which is the discontinuous surface so as to pass through the washing sheet. Preferably, the hole has an area of 0.01mm ² ~ 100mm ^2, and more preferably has an area of 0.1mm ² ~ 10mm ^2. The hole may be formed in only a part of the groove or may be formed in the whole groove.

As shown in Figs. 14A and 14B, when the discontinuous surface 5b is a protrusion, the ratio t4 / t4 of the thickness t4 of the discontinuous surface 5b and the thickness t3 of the continuous surface 5a is shown. t3) is preferably 1.01 to 5. Figure 14 (a) shows a case where the discontinuous surface is formed on one side of the laundry sheet, Figure 14 (b) shows a case where the discontinuous surface is formed on both sides of the laundry sheet.

A guide roll 141 may be installed between the release film supply roll 110 and the coating means 120. As the release film 1, paper, polyethylene (PE), polyethylene terephthalate (PET), or the like may be used.

According to this embodiment, when the washing compound is coated on the upper surface of the release film 2 by the coating means 120, since the embossed groove or protrusion (2a) is formed on the release film 2, the coating Embossing is formed on the dried laundry sheet 5.

In the meantime, reference numerals 160 and 162 denote rolls for guiding the washing sheet 5.

15 is a block diagram showing an apparatus for manufacturing a laundry sheet according to a third embodiment of the present invention, Figure 16 is a plan view showing a part of the embossed belt provided in the laundry sheet manufacturing apparatus. The same reference numerals as those in FIGS. 1 to 14 in FIGS. 15 and 16 denote the same elements.

Referring to the drawings, the washing sheet manufacturing apparatus 300, the first, second, third rollers 311, 312, 313, the coating roll 122, and the first, second, third rollers 311 (312) (313) and the embossed belt (4) for driving the coating roll 122 in an endless track, coating means (120) for coating the formulation for washing on the embossed belt (4), and the first roller And a drying member 130 provided between the 311 and the second roller 312.

Among the components, the coating means 120 and the drying member 130 are the same as the coating means 120 and the drying member 130 of the first embodiment, and thus description thereof will be omitted.

A motor (not shown) may be installed in the first roller 311. When the first roller 311 is rotated by the rotation of the motor, the emboss belt 4 travels the first, second, and third rollers 311, 312, 313 and the coating roll 122 in an endless track. do. It will be apparent to those skilled in the art with reference to the present specification that the motor may be installed on the second roller 312 or the third roller 313 instead of the first roller 311. On the other hand, although the second roller 312 is composed of two in the drawing, it will be apparent to those skilled in the art that the second roller 312 may be formed as one.

An embossed groove or protrusion 4a is formed on the surface of the embossed belt 4. The embossing grooves or projections 4a have a depth (height) enough to form embossing (continuous and discontinuous surfaces) on the washing sheet 5 made by coating a washing compound on the surface of the emboss belt 4. Has a diameter.

When the embossed groove is formed on the surface of the embossed belt 4, the discontinuous surface which is a protrusion is formed in the washing sheet, and when the embossed protrusion is formed in the surface of the embossed belt 4, the discontinuous surface which is a groove is formed in the washing sheet.

The embossed belt 4 is moved toward the third roller 313 while surrounding the outer circumferential surface of the second roller 312, and the laundry sheet 5 made by drying the laundry formula is separated from the embossed belt 4. It is moved backwards (+ x direction). Reference numeral 314 denotes a roller for guiding the washing sheet 5 separated from the emboss belt 4.

A pair of guide rollers 360 and 362 may be installed behind the second roller 312. In addition, any one of the guide rollers 360 and 362 may be rotated by a motor (not shown), which may move the washing sheet 5 rearward.

17 is a perspective view showing an apparatus for manufacturing a laundry sheet according to a fourth embodiment of the present invention.

Referring to the drawings, the laundry sheet manufacturing apparatus 400 includes a flat plate member 410 having a plurality of embossing protrusions or grooves 412.

The laundry formula is coated and dried on a flat plate (not shown) to form a laundry sheet, and then the laundry sheet is placed on the flat plate member 410 and pressurized to emboss the laundry sheet. That is, the continuous surface and discontinuous surface) can be formed. The pressurization may be performed by a manual operation of an operator, or may be performed by using a predetermined press. At this time, the pressing surface of the press is preferably made of a soft material such as rubber.

1, 2: release film
2a, 4a, 412: embossed grooves or protrusions
4: embossed belt 5: laundry sheet
5a: continuous surface 5b: discontinuous surface
110: release film supply roll 120, 120a: coating means
130: drying member 140, 142: separation roll
150: embossing roller 151: embossing projection
155: pressure roller 156: embossed groove
311: first roller 312: second roller
313: third roller
100, 200, 300, 400: Washing sheet manufacturing apparatus

Claims (13)

The surface consists of a continuous surface and a discontinuous surface, a discontinuous surface is surrounded by a continuous surface, and a discontinuous surface differs in height in the thickness direction compared with the surrounding continuous surface, The water-soluble laundry sheet characterized by the above-mentioned. The method of claim 1,
Discontinuous surface is a water-soluble laundry sheet, characterized in that the grooves concaved with respect to the continuous surface or a protrusion projecting against the continuous surface. The method according to claim 1 or 2,
The discontinuous surface is a groove recessed with respect to the continuous surface, and the ratio (t1 / t2) of the thickness t1 of the continuous surface to the thickness t2 of the groove portion is 1.01 to 5. The method of claim 3,
The groove is water-soluble laundry sheet, characterized in that formed in the groove (hole) through the sheet. The method according to claim 1 or 2,
The discontinuous surface is a protrusion protruding with respect to the continuous surface, and the ratio (t4 / t3) of the thickness t4 of the protrusion to the thickness t3 of the continuous surface is 1.01 to 5. (a) preparing an embossing roller and an pressurizing roller having embossed protrusions formed on an outer circumferential surface thereof; And
(b) allowing the laundry sheet formed by drying the laundry mixture to pass between the embossing roller and the pressure roller so that the pressure roller presses the laundry sheet against the embossing roller to form a continuous surface and a discontinuous surface on the laundry sheet. Method of producing a water-soluble laundry sheet comprising a ;. The method according to claim 6,
After step (a),
(a1) coating a laundry mixture on a release film;
(a2) drying the release film coated with the laundry mixture after step (a1); And
(a3) separating the laundry sheet formed by drying the laundry mixture after the step (a2) from the release film; a method for manufacturing a water-soluble laundry sheet comprising a. The method according to claim 6,
Method for producing a water-soluble laundry sheet, characterized in that the embossed groove corresponding to the embossing projection is formed on the outer peripheral surface of the pressure roller. (a) preparing a release film having embossed grooves or protrusions formed on an upper surface thereof;
(b) coating a coating solution for laundry on the release film; And
(c) drying the release film coated with a laundry formula;
Method for producing a water-soluble laundry sheet, characterized in that the continuous sheet and the discontinuous surface is formed by the embossed grooves or protrusions in the laundry sheet made by drying the laundry formulation liquid. 10. The method of claim 9,
After the step (c), the method for producing a water-soluble laundry sheet comprising the step of separating the laundry sheet made by drying the laundry formula liquid from the release film. (a) traveling between the first roller and the second roller in an orbit and preparing an embossed belt having embossed grooves or protrusions formed on a surface thereof;
(b) coating a laundry formula on the surface of the embossed belt traveling on the track; And
(c) drying the coated laundry formulation;
The method for producing a water-soluble laundry sheet, characterized in that the continuous sheet and the discontinuous surface is formed by the embossed grooves or protrusions on the laundry sheet made by drying the laundry formulation liquid. The method of claim 10,
After the step (c), the embossed belt is moved toward the first roller while surrounding the outer circumferential surface of the second roller, and the laundry sheet made by drying the washing compound is separated from the embossed belt. Manufacturing method. (a) preparing a flat member having a plurality of embossing protrusions or grooves formed on an upper surface thereof to pressurize the laundry sheet made by drying the laundry formula to form a continuous surface and a discontinuous surface on the laundry sheet; And
(b) pressurizing the washing sheet against the flat member to form a continuous surface and a discontinuous surface on the washing sheet.

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