Pillow

Abstract

To provide a pillow with less flattening by using foam beads with higher strength than the one in a conventional manner as a stuffing material.SOLUTION: A stuffing material of a pillow includes mixture of composite beads being copolymer foam resin beads of a polystyrene resin and a polyethylene resin and granular cotton having a particle size which is 0.8-2 times the particle size of the composite beads. It is preferable that the granular cotton has bulk density of 0.01-0.1 mg / cm3, the composite beads have the particle size within the range of 4-7 mm, and the granular cotton has the particle size within the range of 5-8 mm.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a pillow, and particularly to a pillow characterized by its filling material. Here, the pillow includes not only the pillow that supports the head but also the so-called hugging pillow.

Background Art

[0002] Conventionally, in a pillow composed of an outer material and a filling material filled inside the outer material, improvements have been made, such as devising materials used for the filling material such as foamed resin beads and buckwheat husks, to improve sagging during long-term use.

[0003] For example, Patent Document 1 describes using various materials such as polystyrene foam (hereinafter referred to as conventional beads), charcoal, and buckwheat husks as filling objects.

[0004] By the way, the cause of sagging is a volume reduction caused by cracking or crushing of the foamed resin beads used in the filling material of the pillow. The foamed resin beads described in Patent Document 1 are manufactured by foaming polystyrene. Since these conventional beads are hard but brittle, when they are filled in a pillow and used for a long time, sagging occurs due to the crushing of the fine cells inside the foamed resin beads.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] The present invention has been made in view of the above circumstances, and an object thereof is to provide a pillow with less sagging by using foamed resin beads having higher strength than conventional ones.

Means for Solving the Problems

[0007] For example, a copolymer foam resin bead of polystyrene resin and polyethylene resin (hereinafter referred to as "composite bead") described in Japanese Patent Application Laid-Open No. 2006-35835 and the like has higher strength than conventional polystyrene beads, so an anti-sagging effect can be expected. However, due to its poor fluidity, when used in a pillow, it makes a rattling sound and lacks comfort. For this reason, composite beads have not been used as a stuffing material for pillows.

[0008] The inventors produced a pillow using these composite beads as a stuffing material for a pillow and mixing cotton that can be expected to have a sound suppression effect during use. However, when this pillow was used for a long time, as shown in FIG. 8, a problem occurred in that the composite beads became solidified and unevenly distributed. This is presumably because the fluidity of the composite beads is low. The inventors succeeded in solving this problem by improving the cotton, suppressing the sound during use, and preventing the uneven distribution of the composite beads during long-term use.

[0009] Specifically, the pillow according to the present invention is characterized in that, as a stuffing material, it contains a mixture of composite beads, which are copolymer foam resin beads of polystyrene resin and polyethylene resin, and cotton (granular cotton) formed into a granular shape having a particle size 0.8 to 2 times that of the composite beads. Specifically, when the diameter of the composite beads is 5 mm, the diameter of the granular cotton is preferably about 4 mm to 10 mm. More preferably, the composite beads and the granular cotton should be of approximately the same size.

[0010] The bulk density of the above granular cotton is preferably adjusted according to the feeling of use, but is in the range of 0.01 to 0.1 mg / cm 3 (on average, approximately 0.02 g / cm 3 degree) is preferred.

[0011] Also, the composite beads are preferably in the range of 4 to 7 mm in particle size, and the granular cotton is preferably in the range of 5 to 8 mm in particle size.

Advantages of the Invention

[0012] According to the pillow of the present invention, even when used in contact with the body, it is possible to suppress sagging while suppressing the sound generated during use, and further improve the bias of the beads during long-term use.

Brief Description of the Drawings

[0013]

Figure 1

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Figure 8

Embodiments for Carrying Out the Invention

[0014] The following three types of test bodies were used for a comparative test. In the following, the test body D is the inner material (stuffing material) of the pillow according to an embodiment of the present invention, and the test bodies B and A are the stuffing materials of the comparison pillows.

[0015] (Test body D) · Weight ratio of composite beads 5 and granular cotton 3. · Regarding the composite beads The particle size is 4 - 7 mm, with an average particle size of 5 mm. The weight of one particle is 1.4 - 1.8 mg, and the average weight is 1.6 mg. Theoretical value for 50 - fold foaming and 5 mm φ. The volume of one particle is 65 ml and the weight is 1.3 mg. · Regarding granular cotton The visually observed particle size is 5 - 8 mm. The weight of one particle is 1 - 2 mg, and the average weight is 1.7 mg.

[0016] (Test Specimen B) · Weight ratio of 50 - fold conventional beads 10 and cotton 1. · Regarding conventional beads The particle size is about 1 mm. · Regarding polyester cotton The length is about 20 - 30 mm and the thickness is about 10 μm.

[0017] (Test Specimen A) · Weight ratio of 40 - fold conventional beads 2, crushed urethane (low resilience) 1, and cotton 0.1. · The size of one side of the crushed urethane is 4 - 8 mm.

[0018] Incidentally, granular cotton (granular cotton) can be manufactured by a known granular cotton granulating device. (An example of the manufacturing method of granular cotton) Feed the loosened polyester cotton into a drum - shaped granular cotton granulating device having a rotating shaft inside. Inside the granular cotton granulating device, while injecting air under pressure, entangle the loosened polyester cotton with the rotating shaft and gradually granulate it into a ball - like state to produce granular cotton with a diameter of about 4 - 10 mm.

[0019] (1) Experiment 1 (Figs. 1, 2, 3) An experimental verification was conducted that the core material of the composite bead pillow (Test Specimen D) has less sagging than the core material of the conventional bead pillow (Test Specimen A).

[0020] 1) Test specimens and test conditions Prepared at the Boken Quality Evaluation Foundation under conditions according to JIS K6400 Method B. The test specimens were compressed to 50% of their height and the compression was repeated 80,000 times. Test Specimen D composite bead pillow material weight 44.5 g, Test Specimen A 44.36 g, The test specimens are cubes of about 100 mm, but due to the stretchable side fabric, the dimensions are not absolute values.

[0021] 2) Verification The restoration rate was calculated using the following formula. Restoration rate (%) = 100 - Repeated compression residual strain (%)

[0022] 3) Images of test specimens Test specimen D, height about 105 mm, restoration rate 100% Test specimen A, height about 85 mm, restoration rate 80% Compared with test specimen B (in the state before compression), test specimens D and A are after compression.

[0023] 4) Discussion Since the side fabric is stretchable, the numerical values are only guidelines, but test specimen D has almost restored while test specimen A is clearly inferior. Therefore, it was found that test specimen D (the pillow of the composite beads) has a higher resistance to sagging effect.

[0024] (2) Experiment 2 (Figure 4) Comparison of the strength between composite beads and conventional beads Method: Using a large finishing hammer machine used for grab processing with 30 seconds as one cycle, pressure was applied by impact and the height was measured. It was found that the composite beads have a smaller rate of decrease in height in each cycle, and the composite beads have a higher resistance to sagging effect compared to the conventional beads.

[0025] (3) Experiment 3 (Figure 5) Regarding the beads themselves, the restorability over time after compression was evaluated. The results showed that, as shown in Figure 5, the composite beads have higher restorability compared to the conventional beads.

[0026] (4) Experiment 4 (Figure 6) Regarding the heat retention rate of each test specimen, it was evaluated by the JIS L1096 A method (constant temperature method) at the Japan Textile Products Quality Technology Center, a general incorporated foundation. The lower the value of the heat retention rate, the better the pillow is. It was found that the pillow filled with composite beads had the lowest heat retention rate and did not trap heat.

[0027] (5) Experiment 5 (Figure 7) A comparative test with conventional products was conducted at the Tokyo Metropolitan Industrial Technology Center using thermography. As shown in Figure 7, it was found that the composite bead pillow was the least likely to trap heat.

[0028] As described above, according to the present embodiment, by using a mixture of composite beads and granular cotton as the filling material for the pillow, compared with the pillow using conventional beads, there is an effect of less sagging and no heat trapping. In addition, instead of mixing cotton in a fibrous state with composite beads, by forming it into granules and mixing, it is possible to suppress the sound during use and suppress the uneven distribution of composite beads.

Explanation of reference numerals

[0029] 10 Composite beads 20 Granular cotton 30 Cotton fiber

Claims

1. A pillow, characterized in that it contains a mixture of composite beads, which are copolymer foamed resin beads of a polystyrene resin and a polyethylene resin, and granular cotton having a particle size 0.8 to 2 times that of the composite beads.

2. The granular cotton has a bulk density of 0.01 to 0.1 mg / cm ３ The pillow according to claim 1, characterized in that it is like this.

3. The pillow according to claim 1 or 2, wherein the composite beads are in the range of 4 to 7 mm in particle size, and the granular cotton is in the range of 5 to 8 mm in particle size.

Images