JPS5991904A - Production of clamp ring of nursing band - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The present invention relates to a method for manufacturing a fastening ring for a baby carrier, etc.
The purpose of the baby carrier band is to provide a fastening ring that has elasticity and has sufficient mechanical strength such as tensile strength and impact strength to be used as a baby carrier, such as a baby carrier band. The purpose of the present invention is to provide a method for manufacturing fastening rings such as the following.

Conventionally, as shown in Figs. 1 and 2, babysitting bands (1
) is the length adjustment point (3) of the shoulder strap (2) or the waist strap (6).
) Use a ring (5) made of metal or the like to fasten.

This fastening ring (5) is generally made of metal in many cases, and therefore has excellent mechanical strength necessary for the baby carrier band (1).

However, this ring (
5), usually these strings (2), (
The end of 6) was folded back as shown in the enlarged quotient in Figure 2, the ring (5) was stored in the folded part, and the edge of the folded part was sewn in to secure the ring (5).

At this time, when manufacturing in large quantities at a factory, etc., the sewing needle often comes into contact with the ring (5) and breaks, and in such cases, the broken needle is attached to the ring (5).
Climb into the strings (2) and (6) around the fastening part,
In some cases, products such as baby carrier bands (1) are shipped with the broken needles still stuck in them.

It is extremely dangerous for infants to use the waist strap (6) or shoulder strap (2) with such a broken needle stored in it. There is a testing machine that inspects wire mesh before shipping, but since this testing machine detects pieces of wire mesh, the rings (5
) If there is a broken needle in the waist strap (6) or shoulder strap (2), it will be detected by the gold tester, but if there is a broken needle in the waist strap (6) or shoulder strap (2) that is located away from the If a broken needle was buried in the waist strap (6) or shoulder strap (2) in a strange way, it was often overlooked by the testing machine and shipped as a product.

When using such a product, the needle will pull out one paddy to the surface side,
Baby carriers such as baby carriers have been undesirable because they have the disadvantage that the needles can get stuck in the infant's legs or body, causing injury or injury to the mother.

Therefore, there has been a need in the industry to create a suitable non-metallic ring material that can reliably detect the presence of a broken needle and has sufficient mechanical strength.

The present invention is applicable to infant carriers such as baby carrier bands as described above.
This was done in order to eliminate the drawbacks, and one embodiment of this invention method will be described below with reference to FIGS. 3 and 4.

In FIGS. 3 and 4, (7) is a fastening ring made of synthetic resin that has a planar ring shape and is provided with a reinforcing material (8) on the inner periphery inside the starting end.

In this invention method, the synthetic resin fastening ring (7) is first formed by molding a thermoplastic resin with water absorption properties into the shape shown in FIGS. 4(A) and 4(B) using an injection method or the like. do.

The thermoplastic resin having water absorbing ability that can be suitably used in the method of this invention is any thermoplastic resin having water absorbing ability, such as nylon 6, for example.

Specific examples thereof include polyamide resins such as 6-6 nylon, polyacetal resins, and cellulose resins such as cellulose acetate.

Among such resins, polyamide resins are particularly preferably used, and a specific example thereof includes the trade name High Cycle Nylon A1030HR (manufactured by Unitika Co., Ltd.).

After molding the thermoplastic resin with such water absorption performance into the shape shown in Figure 4 (N(8)) using any molding method such as injection molding, the molded product is naturally cooled and
The molded material is heated to about 00.degree. C. or 105.degree. C. for a required period of time, for example, 8 to 10 hours, and the moisture adsorbed after molding is removed to form an absolutely dry track.

This bone-drying treatment is carried out in consideration of the saturated water absorption rate (several inches) that allows the fastening ring (7) to have sufficient mechanical strength while giving it elasticity. This is to remove water absorption.

After this, the fastening ring (7) after the bone-drying process is inseminated in water heated to at least 60°C or higher, and the boiling process is performed.
Absorb water to the saturated equilibrium water absorption rate.

In this invention method, the temperature is 60℃ to 13℃ for boiling treatment.
It is preferable to heat the ring at a temperature of about 0° C.; too high a temperature is undesirable because the mechanical strength of the fastening ring (7) deteriorates, and too low a temperature is undesirable because the processing time becomes longer.

The insemination treatment time for this boiling treatment process is the fastening ring (
7) has to be carried out until it reaches an equilibrium moisture content of 1 to 4 inches, preferably 2 inches, with appropriate flexibility and sufficient mechanical strength. It takes about 1 hour at ℃.

By performing the boiling treatment in this manner, elasticity and impact resistance can be imparted to the fastening ring.

A specific example is shown next. As the thermoplastic resin, the above-mentioned high cycle nylon A1030HR was used, as shown in Fig. 4 (A).
, and molded into the shape shown in (B). In addition, D is 6.0
(m and d were set to 5.0 cm. This molded article was subjected to an absolute drying process and then a boiling process to a saturated water absorption rate of 2%.

The tensile strength of the fastening ring thus prepared was tested at 20°C and -10°C. The results are shown in Table 1.

The test was conducted four times under each temperature condition, and the test method was a load cell method and a tensile speed of 200i.
I did it in ui/edition.

As a comparative example, a tensile test was conducted at room temperature of 20° C. using a fastening ring that had not been subjected to any absolute drying treatment or water absorption treatment, and the average value was 120 kpf.

On the other hand, when the impact strength was tested by Izotsu impact test, k
The comparative example in which water absorption treatment was not performed during the dry season was 20 kpcm, whereas in the fastening ring manufactured by the specific example according to the method of this invention, 1- of 60 Gin steel was Samurai t'L.

In addition, when the elastic force was examined by finger touch, the comparative example was found to be very hard. In the specific example, rebound elastic force against acupressure was observed.

On the other hand, when the water absorption rate and the rate of change in dimension of the fastening ring of the specific example were investigated, no dimensional change occurred when the water absorption rate was less than 396.

As can be seen from the above results, the fastening ring obtained by the embodiment of this invention method can obtain sufficient mechanical strength for a baby carrier band, which requires at least 100 kzf or more in terms of load cell type tensile strength, and also has impact strength. This is a fastening ring for a babysitting band, etc., which has sufficient elasticity and has the necessary elasticity for infants.This test was conducted to prevent danger to the user due to needle breakage. The functions of the machine can be demonstrated reliably.

As shown in FIGS. 3 and 4 (5) and (B), the reinforcing material (8) has the function of maintaining the overall shape of the fastening ring (7) in a ring shape, and also has the function of maintaining the overall shape of the fastening ring (7). It also has the effect of controlling the movement of the ring (7) and ensuring its position when sewing the ring (7).

[Brief explanation of the drawing]

1 and 2 are explanatory diagrams of a conventional baby carrier band, etc., FIG. 3 is an explanatory diagram of a fastening ring of a baby carrier manufactured by the method of the present invention, and FIG. (B) is an explanatory view of the appearance of a fastening ring obtained by the method of this invention. (7)...Tightening ring (8)...Reinforcement material Figure 4 (A) (B)

Claims (1)

[Claims] (1) Molding a thermoplastic resin with water-absorbing properties into a flat ring-shaped fastening ring with a reinforcing material on the inner periphery of the starting edge, then heating and drying the fastening ring to an absolutely dry state;
A method for producing M-bands such as babysitting bands, which comprises boiling for a final Vζζ time.