JP2000327003A - Plastic cap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a gap from being generated between a cap main body and a lid section when the lid section is fitted on the cap main body, and, prevent a hinge section from being cut even when the opening/closing of the lid section is performed s specified number of times by forming a recess section which is astride of the bent part of the hinge section. SOLUTION: On a hinge section 100, a recess section 110 which is astride of a bent part 101 is formed. In this case, the hinge section 100 is formed in a manner to have a thickness of 0.4 to 0.6 mm. Also, the recess section 110 is formed into a rectangular shape having a depth of 1.0 to 0.2 mm, a length 1 which is 50% or larger of the length L of the bent part of the hinge section 100, and a width of 1 mm or larger. By this constitution, a shape distortion when the hinge section 100 is bent due to the opening/closing of a lid section 300 can be softened by the recess section 110, and a loading applied to the bent part is reduced. As a result, the hinge section 100 is not cut even after the lid section 300 is opened/closed 600 times.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cap used for food such as ponzu and mirin and non-food such as shampoos, softeners and kitchen detergents. The present invention relates to a one-piece plastic cap to be connected via a part.

[0002]

2. Description of the Related Art Conventionally, a bottle filled with a liquid content has a lid (300) provided on a cap body (200) with a hinge portion (300) as shown in FIG. One-piece plastic caps (10) connecting via 100) have been used over a wide range of applications.

[0003]

However, the above-mentioned conventional plastic cap is difficult to open at the time of use or is easy to remove after use, as shown in FIG. A thin weak line (220) is provided at a predetermined position of (200), and an opening pull ring (210) is opened.
And a detachable knob, and the cap is formed using a soft resin such as low-density polyethylene. Therefore, the thickness is small (usually 0.3 to
(0.6 mm thick) The hinge part was sometimes cut by opening and closing the lid several tens times.

The present invention has been made to solve the above-mentioned conventional problem. When a cap is attached to a cap body, there is no gap between the cap body and the cover, and the cap is used 600 times. The present invention provides a plastic cap whose hinge portion is not cut even when the cover is opened and closed.

[0005]

That is, the first aspect of the present invention is as follows.
According to the invention, there is provided a one-piece plastic cap in which a lid is connected to a cap body via a hinge portion, wherein the plastic portion is formed with a concave portion straddling a bent portion of the hinge portion.

Next, a second invention of the present invention is a one-piece plastic cap in which a lid is connected to a cap body via a hinge, wherein a notch is provided at a center position of the hinge, and the notch is provided. Forming a concave portion straddling the bent portion of the hinge portion on both sides of the portion, and,
An elastic band for connecting a cap body and a lid is provided below the notch.

According to a third aspect of the present invention, the hinge portion includes:
With a thickness of 0.4 to 0.6 mm, the recess is 0.1 to
The first or second invention is characterized in that it has a depth of 0.2 mm, a length of 50% or more of the length of the bent portion of the hinge portion, a width of 1 mm or more, and a rectangular shape. It is a plastic cap described.

[0008]

In the plastic cap of the present invention, since the thickness of the hinge portion is as thin as 0.4 to 0.6 mm, there is no gap between the cap body and the cover when the cover is attached to the cap body. In the repeated tests by the present inventors, when the thickness of the hinge portion is 0.6 mm or more, a gap is formed between the cap body and the lid portion, and when the thickness is 0.4 mm or less, the gap is cut by opening and closing the lid portion. Easy to do.

Also, the plastic cap of the present invention
0.1-0.2m depth at the bent part of the hinge
m, the length is 50% of the length of the bent part of the hinge
As described above, the rectangular concave portion having a width of 1 mm or more is formed so as to straddle, the shape distortion at the time of bending of the hinge portion due to opening and closing of the lid portion is reduced by the concave portion, and the load force applied to the bent portion is reduced. Decrease. As a result, the hinge does not break even when the lid is opened and closed 600 times. In the repeated tests of the present inventors, when the depth of the concave portion is less than 0.1, the effect is small, and when the depth is 0.2 mm, the strength is weak, and the length of the concave portion is smaller than the bent portion of the hinge portion. If the length is 50% or less, the effect is small, and if the width of the concave portion is 1 mm or less, the effect is small.

A notch is provided at a center position of the hinge, and a concave portion is formed over the bent portion of the hinge on both sides of the notch, and a cap body is provided at a position below the notch. The plastic cap of the present invention provided with, for example, a U-shaped elastic band that connects the cover and the lid, when the lid is not fully opened and closed by the action of the elastic band, from the position. A snap hinge function is provided to automatically open or close the lid completely. Further, by providing the elastic band portion, the strength against opening and closing of the hinge is increased, and when the contents are poured out, the opening of the lid is complete and there is no play, and the contents can be easily poured out.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a plastic cap according to the present invention.

As shown in FIG. 1 or FIG. 2, a plastic cap (10) according to an embodiment of the present invention has an opening pull ring (210), a removal knob (230), and a thin weak line (220) at a predetermined position. Provided cap body (2
00) is a cap to which the lid is connected via a hinge (100) that bends when the lid (300) is opened and closed.

This plastic cap is usually made of a thermoplastic resin such as low-density polyethylene, and the cap body, the hinge portion and the lid portion are integrally formed in one piece by an injection molding method.

As shown in FIGS. 1 and 2, the hinge (100) has a recess (110) extending over the bent portion (101). The hinge part is
With a thickness (D) of 0.4 to 0.6 mm, the concave portion is 0.1 to
It is formed in a rectangular shape with a depth (d) of 0.2 mm, a length (l) of 50% or more of the length (L) of the bent portion of the hinge portion, and a width (w) of 1 mm or more. is there. In the plastic cap of the present embodiment, a notch (120) is provided at the center of the hinge, and recesses are formed on both sides of the notch.

Next, as shown in FIGS. 3 (a) and 3 (b), a plastic cap (10) according to another embodiment of the present invention has a lid (300) attached to a cap body (200) by a hinge. One-piece plastic cap connected via (100), provided with a notch (120) at the center of the hinge, and straddling the bent part (101) of the hinge on both sides of the notch. Each of the recesses (110) is formed, and a U-shaped elastic band (400) for connecting the cap body (200) and the lid (300) is provided below the notch (120). Things. The method of forming and manufacturing the hinge portion and the concave portion is the same as that of the plastic cap of the above-described embodiment. Also, this plastic cap (10) is shown in FIG.
As shown in the figure, the lid (300) is attached to the cap body (20).
When the cover (300) is opened from the cap body (200) when the cover (300) is opened from the cap body (200) as shown in FIG. It has a so-called snap hinge function that opens automatically and firmly by the action of the elastic band (400).

In the plastic cap according to the embodiment of the present invention, when the lid is attached to the cap body, there is no gap between the cap body and the lid, and
Even when the lid was opened and closed 00 times, the hinge did not break.

[0017]

According to the plastic cap of the present invention, when the lid is mounted on the cap body, there is no gap between the cap body and the lid, and the plastic cap is formed so as to straddle the bent portion of the hinge portion. Due to the effect of the concave portion, the hinge portion is not cut even when the lid is opened and closed 600 times.

Further, the plastic cap of the present invention comprises:
It is also possible to provide a snap hinge function.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part for explaining an embodiment of a plastic cap of the present invention.

FIG. 2 is a sectional view of a main part of the cap shown in FIG.

FIG. 3A is a plan view of a main part for explaining another embodiment of the plastic cap of the present invention, and FIG.
Is a cross-sectional view of the main part.

FIG. 4A is a cross-sectional view of a main part showing a state where the lid of the cap shown in FIG. 3 is closed to a cap body;
FIG. 4B is a cross-sectional view of a main part showing a state when the lid is opened from the cap body.

FIG. 5 is a cross-sectional view of an example of a plastic cap in which a lid is connected to a cap body via a hinge.

[Explanation of symbols]

 Reference Signs List 10: plastic cap 100: hinge portion 101: bent portion 110: concave portion 120: cutout portion 200: cap body 210: pull ring for opening 220: thin-walled weak wire 230: knob for removal 300 ... Lid 400 ... Elastic band

 ────────────────────────────────────────────────── ─── Continued on the front page F term (reference) 3E084 AA04 AA12 AB01 AB05 BA03 CA01 CB01 CB02 CB04 CC03 DA01 DB11 DC03 EA04 EB01 EB02 EB04 EC03 FA04 FA09 GA06 GB06 KA15 KB01 LA03 LA07 LA18 LB02 LD01

Claims (3)

[Claims] 1. A one-piece plastic cap in which a lid is connected to a cap body via a hinge, wherein a recess is formed over the bent portion of the hinge. 2. A one-piece plastic cap in which a lid is connected to a cap body via a hinge, wherein a notch is provided at a center position of the hinge, and a bent portion of the hinge on both sides of the notch. A plastic cap is provided, each of which has a recess extending over the elastic member, and an elastic band connecting the cap body and the lid is provided below the notch. 3. The hinge portion has a thickness of 0.4 to 0.6 mm, and the concave portion has a depth of 0.1 to 0.2 mm, and the length of the bent portion of the hinge portion is 50% or more. 1m in length
The plastic cap according to claim 1, wherein the plastic cap has a width of not less than m and has a rectangular shape.