Rubber plug for a vial container having concavo-convex connecting portions
A rubber plug for a vial container includes a leg portion press molded independently, and having a base end side portion, and a plate-shape cap portion bonded to the base end side portion press-molded with the leg portion. The leg portion and the plate-shape cap portion have bonding areas formed as concentric concavo-convex areas. The base end side portion of the leg portion including the area bonded with the plate-shape cap portion is formed of a material same as that of the plate-shape cap portion. A remaining portion of the leg portion except for the base end side is formed by a material different from the plate-shape cap portion.
1. A rubber plug for a vial container, comprising:
a leg portion,
a base end side portion made of a material different from that of the leg portion and press molded with the leg portion, the base end side portion having, at a side opposite to the leg portion, a convex portion and a ring-shape recess surrounding an outer circumferential side of the convex portion, and
a cap portion bonded to the base end side portion press-molded with the leg portion, and having a top part, a concave portion on a side opposite to the top part, and a ring-shape projection surrounding the concave portion,
wherein the convex portion fits into the concave portion and the ring-shape projection fits into the ring-shape recess so that the leg portion and the cap portion are bonded through the base end side portion,
the base end side portion is formed of a same material as the cap portion, and the leg portion is formed by a material different from the cap portion.
2. A rubber plug for a vial container according to claim 1 , wherein the cap portion and the base end side portion comprise elastomer compounded silicone rubber or elastomer compounded butadiene rubber, and
the leg portion comprises butyl rubber.
3. A rubber plug for a vial container according to claim 1 , further comprising a film between the base end side portion and the leg portion,
wherein the film comprises polyethylene bonding the base end side portion and the leg portion.
4. A rubber plug for a vial container according to claim 1 , further comprising a seal ring on a circumferential of the leg portion,
wherein the seal ring is a ring-shape bulge having a diameter which is larger than a maximum diameter of the leg portion.
5. A rubber plug for a vial container according to claim 1 , wherein the base end side portion has another ring-shape recess inside the convex portion.