JP2010166943A - Pillow - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive pillow having a simple structure, having excellent air permeability when used, permitting easy adjustment of the hardness, capable of being washed if stains are noticeable, and capable of being dried after washing in a short period of time. <P>SOLUTION: A bag body 11 made of membrane-free urethane foam having no cell membranes, having a cell number of 10-90 cells/25 mm, and a density of 15 to 100 kg/m<SP>3</SP>, is filled with chips 21 made of membrane-free urethane foam having no cell membranes, having a cell number of 4-90 cells/25 mm, a density of 15 to 100 kg/m<SP>3</SP>to achieve a desirable hardness. With this structure, the pillow 10 having high air permeability being washable, and dried after washing in a short period of time, is provided. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a pillow that has good air permeability and is easy to wash.

Conventionally, pillows in which bags such as buckwheat husks, rice husks, feathers, and urethane foam are housed are used.
Moreover, since the pillow is in contact with the head directly or via a pillow cover every day, it is desired to be hygienic.

However, the conventional pillow cannot be washed because the stuffing is damaged or the inside of the stuffing cannot be sufficiently dried when washing.
In addition, when the heat dissipation is poor, the pillow is easily stuffy due to heat of the head, sweat, etc., and disturbs comfortable sleep. Further, the pillow preferably has a hardness that allows the user to feel comfortable.

  In addition, as a pillow that enhances air permeability and enables washing, (1) a skeleton containing a thermoplastic elastomer and a softening agent, and a porous body in which the gap between the skeletons is a communication hole communicating with the outside, Pillows using a cushioning material with Asker F hardness of 72 or less, or (2) what formed a recess in the center of the bottom of a non-film urethane foam sheet from which the gaps between the bubbles of the open-celled urethane foam were removed, A pillow has been proposed in which a multilayer structure is formed by laminating a film-free urethane foam sheet, and the multilayer structure is housed in a bag formed of a knitted fabric having air permeability at least on the upper surface side.

  However, the pillow of (1) is required to be further improved in air permeability, and even if it can be washed, there is a problem that it takes time to sufficiently dry the inside. Furthermore, since the pillow of (1) is determined by the thermoplastic elastomer, the pillow must be prepared in order to meet a variety of hardness requirements. There is a problem that becomes troublesome and increases the cost of the pillow. In addition, since the pillow of (2) is determined by the hardness of the non-film urethane foam sheet, a variety of non-film urethane foam sheets must be prepared to meet various hardness requirements. However, as in (1), the manufacturing efficiency and management become troublesome, and there is a problem that the cost of the pillow is increased. There is a problem that increases the cost of pillows.

JP 2002-102021 A JP 2000-139653 A

  The present invention has been made in view of the above points, and an object of the present invention is to provide an inexpensive pillow that has good air permeability, can be washed, and can be easily adjusted in hardness.

  The invention of claim 1 relates to a pillow in which a bag made of a filmless urethane foam having no cell membrane is filled with a chip of a filmless urethane foam having no cell film.

  The invention of claim 2 is characterized in that, in claim 1, the number of cells of the filmless urethane foam constituting the bag body is larger than the number of cells of the filmless urethane foam comprising no cell film constituting the chip. To do.

  Film-free urethane foam without cell membrane (hereinafter referred to as film-free urethane foam) consists of a three-dimensional network skeleton consisting of cell skeletons without cell membranes (bubble membranes). It is hard to collect. The pillow according to the present invention has a bag body and a chip in the bag body made of such a film-free urethane foam. Therefore, the pillow according to the present invention has high air permeability and can suppress the stuffiness of the head at the time of use. It is possible to carry out washing by the method, and the drying time after washing is short. Furthermore, the pillow according to the present invention has a very high air permeability because the degree of close contact between the chips in the bag is reduced and a gap is easily formed between the chips in an uncompressed state when not in use. Therefore, the air permeability becomes extremely high and the drying time can be further shortened at the time of drying after washing, which is not compressed as in the case of non-use.

  Furthermore, the pillow of the present invention can easily adjust the hardness of the pillow by adjusting the hardness and amount of the chips filled in the bag body, and easily and inexpensively obtain pillows of various hardnesses. be able to.

  Further, in the pillow of the present invention, the number of cells of the non-membrane urethane foam constituting the bag body is made larger than the number of cells of the non-membrane urethane foam constituting the chip, so that the chip in the bag body has a coarse cell (cell Even when the air permeability is low (the number is small), the feeling of the chip due to the cell skeleton can be reduced by the bag, and a good feeling of use can be obtained.

It is a partially cutaway perspective view of a pillow according to an embodiment of the present invention.

The pillow 10 shown in FIG. 1 has a configuration in which a chip 21 is filled in a bag body 11, and is used by being covered with a pillow cover (not shown) made of cloth or the like as necessary.
The bag body 11 is formed by forming a sheet body of filmless urethane foam into a bag shape by sewing or welding. In this embodiment, two sheets of rectangular non-film urethane foam sheets are stacked and welded around the three sides to form a bag with the remaining one side opened, and the chip 21 is inserted into the bag from the open side. After filling, the open side was sealed by welding to form the pillow 10. In addition, you may comprise the said bag body 11 so that one side part can be opened and closed with a fastener.

  The filmless urethane foam constituting the bag body 11 is formed by a known cell film removal method. Cell membrane removal methods include a method by blending urethane foam, an alkali treatment method after urethane foam formation, an explosion treatment method, and the like, and any method may be used. The filmless urethane foam constituting the bag body 11 may be either an ether type or ester type urethane foam, and may be either a general-purpose type or a type having low resilience. From the viewpoint of durability, ether type urethane foam is preferred.

  The filmless urethane foam constituting the bag body 11 preferably has 10 to 90 cells / 25 mm of cells (JIS K 6400-1). When the number of cells is less than 10/25 mm, the cells become rough and the feeling of use of the pillow 10 becomes worse. The number of cells of the non-film urethane foam constituting the bag 11 for obtaining a good feeling of use of the pillow is more preferably 20 to 80/25 mm, and further preferably 30 to 60/25 mm. On the other hand, when the number of cells is larger than 90 cells / 25 mm, the cells become too fine, the air permeability of the bag body 11 is lowered, and a long time is required for drying after washing the pillow body 10. Furthermore, the filmless urethane foam constituting the bag body 11 preferably has a larger number of cells than the filmless urethane foam constituting the chip 21 described later. Thus, even if the number of cells of the chip 21 is reduced (roughening the cells) and air permeability is increased by setting the number of cells of the film-free urethane foam in the bag 11 and the chip 21, the chip 21 It can be eased by the bag body 11 that the feeling of the rough cell is transmitted to the user, and a good feeling of use can be obtained.

Furthermore, no film urethane foam constituting the bag 11 has a density (JIS K 7222) ones of 15kg ^{/ m 3} ~100kg ^/ m 3 and more preferably. When the density is less than 15 kg / m ³ , the feeling of use becomes worse. On the other hand, when the density is larger than 100 kg / m ³ , the density is too hard, the feeling of use of the pillow 10 is deteriorated, and the weight is too heavy. The density of the filmless urethane foam constituting the bag body 11 is more preferably 20 to 90 kg / m ³ , and further preferably 25 to 80 kg / m ³ . In addition, although the thickness of the filmless urethane foam which comprises the said bag body 11 changes with the number of cells of a filmless urethane foam, and is determined suitably, normally about 3 mm-30 mm are preferable.

The chip 21 is made of a small piece of filmless urethane foam. The film-free urethane foam constituting the chip 21 is obtained by a known cell membrane removal method, and the number of cells (JIS K 6400-1) is 4 to 90/25 mm, and the density (JIS K 7222) is 15 kg. / M ^{3 to} 100 kg / m ³ is more preferable. When the number of cells is less than 4 pieces / 25 mm, when the chip 11 is filled in the bag body 11, the amount of filling increases as the overlap of the chips 21 increases, the weight of the pillow increases, and the cushion Sexuality gets worse. On the other hand, when the number of cells is larger than 90 cells / 25 mm, the cells become too fine, the air permeability of the chip 21 is lowered, and a long time is required for drying after washing the pillow 10. The number of cells of small pieces of the filmless urethane foam used as the chip 21 is more preferably 5 to 50/25 mm, and further preferably 5 to 30/25 mm. On the other hand, when the density is less than 15 kg / m ³ , the feeling of use becomes worse. On the other hand, when the density is larger than 100 kg / m ³ , the pillow 10 is too hard or too heavy, and the feeling of use of the pillow 10 is deteriorated. The density of the small pieces of the filmless urethane foam used as the chip 21 is more preferably 20 to 90 kg / m ³ , and further preferably 25 to 80 kg / m ³ .

  The size of the chip 21 is determined as appropriate, but a particle size (one side in the case of a cube) of about 3 mm to 50 mm is preferable. The particle diameter of the chip 21 is more preferably 5 mm to 40 mm, and still more preferably 5 mm to 30 mm. Further, the chip 21 may have an appropriate shape such as a spherical shape or a polygonal shape, or a mixture thereof. The chip 21 housed in the bag body 11 is not limited to one type, and a plurality of types of chips formed from film-free urethane foam having different types of urethane foam, different numbers of cells and different densities may be used. For example, the pillow 10 can be finely adjusted to a desired hardness by adjusting the mixing ratio of a plurality of types of chips formed from filmless urethane foams having different densities. Furthermore, the hardness of the pillow 10 can also be adjusted by adjusting the filling amount of the chip 21 into the bag body 11. In this way, the chip 21 filled in the bag body 11 is composed of a mixture of a plurality of types of chips formed of filmless urethane foams having different densities, or the filling amount of the chip 21 is adjusted. The hardness of the pillow 10 can be finely adjusted, and various types of pillows with different hardnesses can be easily obtained.

  The pillow 10 having the above-described configuration has high air permeability due to the bag body 11 and the chip 21 in the bag body 11, and can hardly cause discomfort due to stuffiness. Moreover, when it is desired to clean the pillow 10, the pillow 10 can be put into a washing machine and washed, and the subsequent drying can be completed in a short time.

  Pillows of examples and comparative examples having the configurations shown in Table 1 were formed. The shape of the pillow in plan view is a rectangle. As the bag, a non-film urethane foam sheet was used in the examples, while a normal flexible urethane foam sheet that was not subjected to the cell film removal treatment was used in the comparative example. Film-free urethane foam sheet and normal flexible urethane foam sheet are composed of 430mm length x 630mm width x 10mm thickness. After filling the chip from the side portion, the open side was closed by welding. The chip in each of the example and the comparative example was made of one type of filmless urethane foam having a cubic shape with sides of 10 mm to 15 mm, and the filling amount was uniformly 350 g. In this example and the comparative example, the chip was directly filled with the chip. However, the chip may be filled in a bag having excellent air permeability, such as a mesh fabric, and then packed in the bag. If it is a bag like mesh fabric, since it is excellent in air permeability, the pillow will not be stuffy during use, and it will not adversely affect the drying properties after washing. Furthermore, the chip is not spilled during chip filling or welding, and workability is improved.

  The pillows of Examples and Comparative Examples were examined for dryness, feel, hydrolysis resistance, and overall evaluation for the above items after washing in a washing machine. The results are shown at the bottom of Table 1. The dryness was measured by washing the pillow with a fully automatic washing machine, leaving it to stand for 3 hours on a sunny day, and then measuring the weight of the pillow. [(Weight after drying-weight before washing) / before washing When the value of [weight × 100] is 0 to less than 3%, ◎ is given when it is 3% to less than 5%, and × when it is 5% or more. The feel was evaluated by the feeling of use when actually used by the subject. The pillow was covered with a polyester fabric pillow cover. In addition, the number of subjects is 10 and the feeling of use is scored in the range of 5 points to 1 point, ◎ if the total score is 41 to 50 points, ○ if 31 to 40 points, In the case of 21 to 30 points, Δ, and in the case of 20 points or less, ×. Regarding the hydrolysis resistance, the retention of tensile strength (JIS K6400-5) after wet heat aging (70 ° C. × 95 RH × 1000 hours) of the urethane foam used in Examples and Comparative Examples is the initial strength before wet heat aging. Compared to when 100 is 100, ◎ for 70% or more, ◯ for 60% to 70%, and x for less than 60%. Comprehensive evaluation: if all items are ◎, overall evaluation ◎, if all items are ◎, ○ if all items are comprehensive, ○ if all items have no x and △ When there was at least one evaluation Δ and ×, the overall evaluation was ×.

  As understood from the measurement results, the pillows of Examples 1 to 11 were all good in dryness, feel and hydrolysis resistance, and the overall evaluations were ◎ and ◯. In Example 12, the number of cells of the film-free urethane foam constituting the bag body is 6/25 mm, the cells are rough, only the touch is slightly inferior, and other dryness and hydrolysis resistance are good. there were. Moreover, about the comparative examples 1 and 2 which comprised the bag body with the flexible urethane foam in which the cell membrane removal process was not performed, it was inferior to drying property.

10 pillows 11 bags 21 chips

Claims (2)

  A pillow in which a non-cell urethane foam chip without a cell membrane is filled in a bag made of a non-cell urethane foam without a cell membrane.   The pillow according to claim 1, wherein the number of cells of the film-free urethane foam constituting the bag body is larger than the number of cells of the film-free urethane foam without the cell film constituting the chip.

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