JP7272886B2 - Base paper for urinalysis cups and urinalysis cups - Google Patents

Description

The present invention relates to base paper for a urinalysis cup and a urinalysis cup made of this base paper for a urinalysis cup.

Urinalysis is widely used in medical examinations, physical examinations, and the like, because it allows us to know the states of various organs such as the kidney, liver, and spleen without causing pain. Paper cups are often used for urine collection, and it is required to hygienically dispose of paper cups after use. It has been proposed that a container having the properties of

JP-A-06-058925 JP 2015-071226 A

An object of the present invention is to provide base paper for a urinalysis cup having water dispersibility and a urinalysis cup made of the base paper for a urinalysis cup that can be discarded in a flush toilet or the like.

Means for solving the problems of the present invention are as follows.
1. A water-dispersible paper, a thermoplastic resin layer formed on the water-dispersible paper, and a waterproof layer formed on the thermoplastic resin layer,
A base paper for a urinalysis cup, wherein the water-resistant layer contains 60 parts by mass or more of microcrystalline wax.
2. 1. The waterproof layer contains 60 to 90 parts by mass of microcrystalline wax and 10 to 40 parts by mass of paraffin wax. Base paper for urinalysis cup described in .
3.1. or 2. A urinalysis cup made of the base paper for a urinalysis cup according to 1.

The urinalysis cup base paper of the present invention has water dispersibility. The urinalysis cup made of the urinalysis cup base paper of the present invention is hygienic because it can be discarded in a flush toilet or the like after use, and does not cause clogging of drain pipes.
Since the base paper for urine test cups of the present invention has folding processability and heat-sealing properties, urine test cups can be formed only from this base paper, and water leakage from the folded and heat-sealed parts is prevented. Hard to happen. Since the urinalysis cup of the present invention is less likely to cause blocking where the water-resistant layers adhere to each other, it can be stored and transported in a compact folded state.

"Base paper for urinalysis cups"
The base paper for urinalysis cups of the present invention comprises water-dispersible paper, a thermoplastic resin layer formed on the water-dispersible paper, and a water-resistant layer formed on the thermoplastic resin layer. contains microcrystalline wax and paraffin wax.

"Water dispersible paper"
In the present invention, water-dispersible paper means paper in which the flock-like water dispersion time is 30 seconds or less. The flocculation water dispersion time is the time required for a 3 cm square test piece to be put into a 500 ml beaker with 300 ml of deionized water being stirred at 650 rpm with a stirrer, and the test piece being torn into two or more pieces. Regarding the water dispersibility of the water-dispersible paper, the floc-like water dispersion time is preferably within 25 seconds, more preferably within 20 seconds, and even more preferably within 15 seconds.

Any water-dispersible paper that satisfies the above-mentioned flock-like water-dispersion time can be used without particular limitation. Water-dispersed paper containing water-soluble polymer in an amount of 10% by weight or less, water-dispersed paper impregnated or coated with a water-soluble polymer, water containing water-dispersible fibers and carboxyalkyl cellulose salts as water-soluble fibers described in Japanese Patent No. 4917274 A base paper for peelable coated paper or the like can be used.

The basis weight of the water-dispersible paper is preferably 20 g/m ² or more and 180 g/m ² or less, more preferably 30 g/m ² or more and 160 g/m ² or less. If the basis weight is less than 20 g/m ² , water resistance may be insufficient. If the basis weight is more than 180 g/m ² , the water dispersibility may deteriorate.
Furthermore, when the basis weight is 80 g/m ² or more and 180 g/m ² or less, it is possible to obtain a urinalysis cup with excellent strength. Further, when the basis weight is 20 g/m ² or more and less than 80 g/m ² , it is possible to obtain a urinalysis cup that is excellent in workability in folding and heat sealing, and that is lightweight and not bulky during storage.

The urinalysis cup of the present invention has the water-resistant layer side of the urinalysis cup base paper as the inner surface, and acid and alkali in the paper do not adversely affect the test results. is not restricted. On the other hand, since the surface opposite to the waterproof layer is touched by hands, the paper surface pH is preferably 3 or more and 12 or less, more preferably 5 or more and 10 or less. By adjusting the paper surface pH to this range, it is possible to prevent the acids and alkalis in the paper from adversely affecting the human body.
The method for adjusting the paper surface pH is not particularly limited, and for example, a water-dispersible paper is made using a material in the neutral region as the main component. Alternatively, an alkaline or acidic water-dispersible paper can be produced by neutralizing it with an acidic or alkaline substance.

<Papermaking>
A fourdrinier paper machine, a cylinder paper machine, a short mesh paper machine, a twin wire paper machine, or the like can be used as a paper machine for producing the water-dispersible paper. Moreover, papermaking is carried out by either a neutral papermaking method or an alkaline papermaking method. In addition, if necessary, aluminum sulfate, various anionic, cationic, nonionic or amphoteric retention improvers, drainage improvers, paper strength enhancers and other internal additives for papermaking are added. can do. Furthermore, if necessary, papermaking additives such as pH adjusters, antifoaming agents, pitch control agents and slime control agents can be added.

<Additional processing of water-dispersible paper>
The water-dispersible paper used in the present invention can be calendered using a general papermaking calender such as a machine calender, a super calender, or a soft nip calender in order to improve smoothness and use it for printing applications. can.

"Thermoplastic resin layer"
The urinalysis cup base paper of the present invention comprises a thermoplastic resin layer formed on at least one surface of water-dispersible paper. The urinalysis cup base paper of the present invention has a heat-sealing property due to the thermoplastic resin layer, and a urinalysis cup that does not leak water can be formed by heat-sealing. Further, the base paper for urinalysis cups of the present invention has a water-resistant layer, and by providing the water-resistant layer on the thermoplastic resin layer, it is possible to prevent coating defects such as pinholes in the water-resistant layer.
The thickness of the thermoplastic resin layer is preferably 20 μm or more. If the thickness of the thermoplastic resin layer is less than 20 μm, the heat seal strength is weak, and coating defects may occur in the waterproof layer. Although the upper limit of the thickness of the thermoplastic resin layer is not particularly limited, if the thickness of the thermoplastic resin layer is thicker than 50 μm, the folding workability may be deteriorated.

The thermoplastic resin layer preferably has an Oken smoothness measured in accordance with JIS P8155 of 100 seconds or more, more preferably 500 seconds or more, and even more preferably 1000 seconds or more. The higher the smoothness of the thermoplastic resin layer, the less likely pinhole defects will occur even when the coating amount of the water-resistant layer to be applied is small, and the penetration of water can be prevented.

In the urinalysis cup base paper of the present invention, the thermoplastic resin used in the thermoplastic resin layer preferably has water solubility at 20°C. Specific examples of such thermoplastic resins include polyvinyl alcohol-based resins, polyalkylene oxide-based resins, hydroxyalkyl cellulose-based resins, and the like. Resins are preferred. Examples of polyvinyl alcohol-based resins include saponified polyvinyl acetates, derivatives thereof, copolymers with other monomers, and the like, and two or more of them can be blended and used. If necessary, the thermoplastic resin layer may contain known additives such as water retention agents, thickeners, plasticizers, antioxidants, processing stabilizers, ultraviolet absorbers, colorants, fragrances, lubricants, antistatic agents, fillers, and the like. agent.

<Formation of thermoplastic resin layer>
The method for forming the thermoplastic resin layer is not particularly limited, and known methods such as extrusion lamination, wet lamination, and dry lamination may be used depending on the composition, viscosity, presence or absence of a solvent, etc. of the composition forming the thermoplastic resin layer. can be formed by the lamination method or the like.

"water resistant layer"
The water-resistant layer imparts water resistance to the base paper for urinalysis cups of the present invention. The urinalysis cup base paper of the present invention is characterized in that the water-resistant layer contains 60 parts by mass or more of microcrystalline wax.
The coating weight of the waterproof layer is preferably 4 g/m ² or more and 35 g/m ² or less. If the coating amount of the water-resistant layer is less than 4 g/m ² , the water resistance may be insufficient, and if it is more than 35 g/m ² , the water-resistant layer may become thick and the heat-sealability may deteriorate. More preferably, the coating amount of the waterproof layer is 5 g/m ² or more and 30 g/m ² or less.

The waterproof layer preferably contains 60 to 90 parts by mass of microcrystalline wax and 10 to 40 parts by mass of paraffin wax. By containing the microcrystalline wax and the paraffin wax within the range of the above parts by mass, the water-resistant layer is less likely to crack, and even if the water-resistant layers come into contact with each other, blocking is less likely to occur. More preferably, the water-resistant layer contains 70 to 85 parts by mass of microcrystalline wax and 15 to 30 parts by mass of paraffin wax. The water-resistant layer of the present invention may contain 60 parts by mass or more of microcrystalline wax, and other petroleum waxes such as petrolatum, animal waxes such as beeswax, plant waxes such as carnauba wax, and oil shell extracts. Mineral wax such as wax, synthetic wax such as polyethylene wax, and if necessary, water retention agents, thickeners, plasticizers, antioxidants, processing stabilizers, ultraviolet absorbers, colorants, fragrances, lubricants, Known additives such as antistatic agents and fillers can be included.

<Formation of water-resistant layer>
The method for forming the water-resistant layer is not particularly limited, and depending on the composition, viscosity, presence or absence of a solvent, etc. of the composition forming the water-resistant layer, a roll coater, a rod metering coater, a bar coater, a blade coater, a curtain It can be formed by a known coating method using a coater, spray coater, gravure coater, or the like.

"urinalysis cup"
The urinalysis cup of the present invention is made of the base paper for the urinalysis cup described above. The base paper for urinalysis cups used in the present invention preferably has a water dispersion time of flocs of 240 seconds or less, more preferably 180 seconds or less, and more preferably 150 seconds or less from the viewpoint of preventing clogging of drain pipes. is more preferable.

The urinalysis cup of the present invention is not particularly limited as long as it has a shape that can hold urine for a certain period of time. can be shaped. In the urinalysis cup of the present invention, the method of joining the base paper for the urinalysis cup is not particularly limited, but since the base paper for the urinalysis cup of the present invention has heat sealability, it is preferable to join by heat sealing. The urinalysis cup base paper of the present invention has heat-sealing properties and can maintain water resistance even when folded. Therefore, the urinalysis cup base paper alone is used to form a urinalysis cup by heat-sealing alone or in combination with folding. can do.

EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited only to the following examples.
"Example 1"
Water-dispersible paper (manufactured by Nippon Paper Papylia Co., Ltd., basis weight: 120 g/m ² , flock-like water dispersion time: 2 seconds) is coated with water-soluble polyvinyl alcohol (manufactured by Kuraray Co., Ltd., Mowiflex C500T) to a thickness of 30 μm. A thermoplastic resin layer was formed by extrusion lamination as follows. On top of this thermoplastic resin layer, a mixture of 80 parts by mass of microcrystalline wax (manufactured by Toyo Adol Co., Ltd., Topco S-968A) and 20 parts by mass of paraffin wax (manufactured by Toyo Adol Co., Ltd., S-923) melted at 120 ° C. Before it cooled and hardened, it was coated with a Meyer bar so as to have a weight of 23 g/m ² to form a water-resistant layer, thereby obtaining base paper for urinalysis cups.

"Example 2"
Base paper for urinalysis cups was obtained in the same manner as in Example 1, except that the coating amount of the water-resistant layer was 28 g/m ² .
"Example 3"
Base paper for urinalysis cups was obtained in the same manner as in Example 1, except that the film thickness of the thermoplastic resin layer was changed to 45 μm.

"Example 4"
Base paper for urinalysis cups was obtained in the same manner as in Example 1, except that the water-resistant layer was formed from 100 parts by mass of microcrystalline wax.
"Example 5"
Base paper for urinalysis cups was obtained in the same manner as in Example 1, except that the film thickness of the thermoplastic resin layer was changed to 60 μm.

"Comparative Example 1"
Base paper for urinalysis cups was obtained in the same manner as in Example 1, except that the water-resistant layer was formed from 100 parts by mass of paraffin wax.
"Comparative Example 2"
Base paper for urinalysis cups was obtained in the same manner as in Example 1, except that the coating amount of the water-resistant layer was 13 g/m ² .

"Comparative Example 3"
Base paper for urinalysis cups was obtained in the same manner as in Example 1, except that the thermoplastic resin layer was not formed.
"Comparative Example 4"
Base paper for urinalysis cups was obtained in the same manner as in Example 1, except that the film thickness of the thermoplastic resin layer was changed to 15 μm.

"Example 6"
Water-dispersible paper (manufactured by Nippon Paper Papylia Co., Ltd., basis weight: 30 g/m ² , flock-like water dispersion time: 2 seconds) is coated with water-soluble polyvinyl alcohol (manufactured by Kuraray Co., Ltd., Mowiflex C500T) to a thickness of 30 μm. A thermoplastic resin layer was formed by extrusion lamination as follows (smoothness: 1000 seconds). On top of this thermoplastic resin layer, a mixture of 80 parts by mass of microcrystalline wax (manufactured by Toyo Adol Co., Ltd., Topco S-968A) and 20 parts by mass of paraffin wax (manufactured by Toyo Adol Co., Ltd., S-923) melted at 120 ° C. Before it cooled and hardened, it was coated with a Meyer bar so as to have a weight of 9 g/m ² to form a water-resistant layer, thereby obtaining base paper for urinalysis cups.
"Example 7"
Examples except that the coating amount of a mixture of 80 parts by mass of microcrystalline wax (Toyo Adol Co., Ltd., Topco S-968A) and 20 parts by mass of paraffin wax (Toyo Adol Co., Ltd., S-923) was 11 g / m ² A base paper for urinalysis cup was obtained in the same manner as in 6.

"Example 8"
Water-dispersible paper (manufactured by Nippon Paper Papylia Co., Ltd., basis weight: 60 g/m ² , flock-like water dispersion time: 2 seconds) is coated with water-soluble polyvinyl alcohol (manufactured by Kuraray Co., Ltd., Mowiflex C500T) to a thickness of 30 μm. A thermoplastic resin layer was formed by extrusion lamination as follows (smoothness: 1800 seconds). On top of this thermoplastic resin layer, a mixture of 80 parts by mass of microcrystalline wax (manufactured by Toyo Adol Co., Ltd., Topco S-968A) and 20 parts by mass of paraffin wax (manufactured by Toyo Adol Co., Ltd., S-923) melted at 120 ° C. Before it cooled and hardened, it was coated with a Meyer bar so as to have a weight of 7 g/m ² to form a water-resistant layer, thereby obtaining base paper for urinalysis cups.
"Example 9"
Example except that the coating amount of a mixture of 80 parts by mass of microcrystalline wax (Toyo Adol Co., Ltd., Topco S-968A) and 20 parts by mass of paraffin wax (Toyo Adol Co., Ltd., S-923) was 16 g / m ² A base paper for a urinalysis cup was obtained in the same manner as in 8.

"Example 10"
Water-dispersible paper (manufactured by Nippon Paper Papylia Co., Ltd., basis weight: 60 g/m ² , flock-like water dispersion time: 2 seconds) is coated with water-soluble polyvinyl alcohol (manufactured by Kuraray Co., Ltd., Mowiflex C500T) to a thickness of 30 μm. A thermoplastic resin layer was formed by extrusion lamination as follows (smoothness of 5000 seconds or more). On top of this thermoplastic resin layer, a mixture of 80 parts by mass of microcrystalline wax (manufactured by Toyo Adol Co., Ltd., Topco S-968A) and 20 parts by mass of paraffin wax (manufactured by Toyo Adol Co., Ltd., S-923) melted at 120 ° C. Before it cooled and hardened, it was coated with a Meyer bar so as to have a weight of 8 g/m ² to form a water-resistant layer, thereby obtaining base paper for urinalysis cups.
"Example 11"
Example except that the coating amount of a mixture of 80 parts by mass of microcrystalline wax (Toyo Adol Co., Ltd., Topco S-968A) and 20 parts by mass of paraffin wax (Toyo Adol Co., Ltd., S-923) was 13 g / m ² A base paper for urinalysis cup was obtained in the same manner as in 10.

"Evaluation method"
Each base paper for urinalysis cups produced above was evaluated as follows. Table 1 shows the results. -Smoothness The smoothness of each of the water-dispersible paper, the thermoplastic resin layer, and the water-resistant layer was measured according to JIS P8155 using an Oken smoothness measuring instrument.
- Dispersibility in water Five 3 cm square test pieces were prepared from the base paper for urinalysis cups produced above. Next, 300 ml of deionized water was put into a 500 ml beaker, and one sheet of the above test piece was added while stirring with a stirrer at 650 rpm. A stopwatch was used to measure the time required for the test piece to break into two or more pieces, and the average value of five measurements was obtained.

-Blocking Evaluation method The water-resistant layer surfaces of the urinalysis cup base paper prepared above were put together, and a weight of 8 kg and a bottom area of 467.74 cm ² was placed on the base paper in an atmosphere of 23°C and 50% RH and allowed to stand for 24 hours. After standing, a test piece with a width of 15 mm was cut out from the place where the weight was placed, and the T-peel strength was measured and evaluated according to the following criteria.
○: Less than 2 kg/15 mm ×: 2 kg/15 mm or more

・Folding workability, heat seal strength A piece of paper measuring 128 mm x 182 mm is cut out from the urine test cup base paper produced above, folded in half at the center in the longitudinal direction, heat-sealed on both sides, and then folded to a height of 67 mm, A urinalysis cup with an opening of 60 mm x 48 mm was manufactured.

Evaluation method for folding workability When the base paper for urinalysis cups produced above was folded to form a cup shape, ◯ was given when creases were formed, and X was given when it was difficult to make creases.
Evaluation method for heat sealability The water-resistant layer surfaces of the urinalysis cup base paper produced above were put together and treated with a heat seal tester at a sealing temperature of 120°C, a sealing pressure of 1 kg/cm ² , and a sealing time of 1 second. A test piece with a width of 15 mm was cut out from the heat-sealed portion, and the T-peel strength was measured and evaluated according to the following criteria.
○: 200 g / 15 mm or more ×: less than 200 g / 15 mm

・Water leakage Pour 10ml of water at 30℃ into the base paper for urinalysis cups manufactured above, and visually check the time until droplets due to water leakage from the heat-sealed part on the side of the container and the crease on the bottom of the container can be seen. and evaluated according to the following criteria.
◎: 180 seconds or more ○: 90 seconds or more and less than 180 seconds ×: less than 90 seconds

The urinalysis cup base papers produced in Examples 1 to 11 of the present invention were excellent in water dispersibility. In particular, the urinalysis cup base papers produced in Examples 1 to 4 and 6 to 11 could be folded and heat-sealed, and the produced urinalysis cups were also excellent in water resistance. Further, since the base papers for urinalysis cups produced in Examples 1 to 3 and 5 to 11 hardly cause blocking, they can be used for envelope-type urinalysis cups that can be folded compactly. The urinalysis cup base paper produced in Example 4 was prone to blocking, and the urinalysis cup base paper produced in Example 5 was inferior in folding workability. It can be manufactured only by sealing, and can be used for a paper cup-type urinalysis cup that does not cause blocking. In addition, the base papers for urinalysis cups produced in Examples 6 to 11 using water-dispersible paper provided with a highly smooth thermoplastic resin layer provided a defect-free water-resistant layer with a small amount of coating.

Claims (3)

A water-dispersible paper, a thermoplastic resin layer formed on the water-dispersible paper, and a waterproof layer formed on the thermoplastic resin layer,
The thermoplastic resin layer has a thickness of 20 μm or more,
The waterproof layer contains 60 parts by mass or more of microcrystalline wax,
When the basis weight of the water-dispersible paper is 80 g/m ² or more and 180 g/m ² or less, the coating weight of the water-resistant layer is 23 g/m ² or more and 35 g/m ² or less, and the basis weight of the water-dispersible paper is A base paper for a urinalysis cup, characterized in that the coating amount of the water-resistant layer is 4 g/m 2 or more and 35 g/m 2 or less when the amount is 20 g/m 2 or more and ⁸⁰ g ^/ m 2 ^or less ^. The base paper for a urinalysis cup according to claim 1, wherein the water-resistant layer contains 60 to 90 parts by mass of microcrystalline wax and 10 to 40 parts by mass of paraffin wax. A urinalysis cup made of the base paper for a urinalysis cup according to claim 1 or 2.