JPS5831799Y2 - Packing structure of container caps - Google Patents

Description

[Detailed explanation of the idea] This proposal relates to a backing structure for a container cap.

Various types of backing structures of this type have been known in the past.

The most common method is to fit a ring-shaped backing to the inner peripheral edge of the top wall of the cap. There was a drawback that the backing easily came off because it was squeezed strongly each time.

In order to eliminate such defects, a backing made of soft synthetic resin with an engaging part protruding upward from the top surface is provided, and an engaging part is also provided on the inner surface of the top wall of the cap, so that both the engaging parts There are caps that have a fitting part, but if the cap is molded from a synthetic resin material, the engaging part is formed on the lower surface of the top wall, which tends to cause sink marks on the upper surface, which spoils the appearance. Met.

Various other structures are conceivable, but all of them have drawbacks such as incomplete bonding of the backing to the top wall of the cap, or a complicated structure that increases costs.

The present invention has a simple structure and can reliably prevent the O-backing from coming off, and will be explained in detail below.

1 is a cap made of synthetic resin.

Reference numeral 2 denotes the top wall thereof, and 3 a peripheral wall extending vertically from the peripheral edge of the top wall, the inner surface of which has a screw 4 for screwing into the mouth and neck portion 12 of the container body.

Reference numeral 5 denotes a flanged backing made of soft synthetic resin, which has a casting hole 6 in its center.

A zero-fitting peripheral wall 7 may be vertically provided between the outer periphery and the inner periphery of the backing in order to fit into the inner surface of the mouth and neck of the container body.

The outer diameter of the backing is the same as the inner diameter of the cap peripheral wall, and the packing surface is brought into contact with the inner surface of the top wall and fitted.

Reference numeral 8 designates a holding member made of synthetic resin, which has a holding plate part 9, a short cylindrical part 10 protruding from the upper surface of its central part, and a welding protrusion 11 protruding from its upper end surface 10a. put.

The outer diameter of the holding plate part 9 is smaller than the outer diameter of the brim-shaped backing, and the outer diameter of the short cylindrical part is set to such an extent that it can be tightly fitted into the casting hole-shaped hole 6.

As shown in the figure, the inner circumference of the brim-like backing is held between the peripheral edge of the presser plate part 9 and the top wall of the cap, and the short cylinder part 10 is inserted into the backing casting hole. The upper end surface of the cap is pressed against the inner surface of the top wall of the cap, and the pressed surface is ultrasonically bonded.

Note that by molding the cap 1 and the presser member 8 from the same synthetic resin material, ultrasonic bonding can be easily performed.

The present invention has the above-mentioned structure, and is provided with a synthetic resin holding member 8 having a short cylindrical part 10 protruding from the upper surface of the central part of the holding plate part 9, and a soft synthetic resin having a casting hole 6. A flange-shaped backing 5 is provided, and the inner circumferential portion of the flange-shaped backing is held between the peripheral edge of the presser plate portion and the top wall of the cap, and the short cylindrical portion 10 is inserted into the casting hole. Since the upper end surface of the short cylindrical part is ultrasonically bonded to the inner surface of the top wall of the cap, only the collar-shaped backing can fall off by appropriately determining the overlapping length of the collar-shaped backing and the presser plate part. This is not the case at all, and since the upper end surface of the short tube part and the inner surface of the top wall of the cap are ultrasonically bonded, they are one piece.)
Welding is ensured.

As a result, the pressing member separates from the top wall.

There's no fear.

Furthermore, since the brim-shaped backing is made of soft synthetic resin, it is more durable than when molded from rubber or foam material, and its sealing effect is excellent.

Since the structure is simple, it can be manufactured at low cost.

[Brief explanation of drawings]

FIG. 1 is an exploded sectional view of a cap having the backing structure of the present invention, and FIG. 2 is a sectional view of the cap screwed onto the neck of the container body. 1...cap, 5...flange-shaped backing, 8...pressing member.

Claims (1)

[Scope of utility model registration request] One side of the flanged backing 5 made of soft synthetic resin, which has a casting hole 6 formed in the center thereof, is brought into contact with the inner peripheral edge G of the top wall 2 of the synthetic resin cap 1, and the center part of the presser plate part 9 is A presser member 8 made of a resin resin with a short cylindrical portion 10 protruding from the upper surface,
The inner peripheral part of the brim-shaped backing is held between the peripheral edge of the presser plate part 9 and the top wall of the cap, and the short cylindrical part 10 is inserted into the casting hole. upper end surface 10a of
A backing structure for a container cap, characterized in that the backing structure is made by ultrasonically bonding the top wall of the cap to the inner surface of the top wall of the cap.