A writing instrument may include an upper pen barrel rotatably connected to a lower pen barrel. A spool valve and fluid reservoirs may be housed in the upper pen barrel. A writing tip secured to the lower pen barrel may be in selective fluid communication with the fluid reservoirs. The upper pen barrel may be rotatable relative to the lower pen barrel of the writing instrument.

A pressure regulating device for a writing tool has a deformable member. Minor air pressure variations in a pen tube of the writing tool can be regulated by deformation of the deformable member. Major air pressure variations in the pen tube can also be regulated by movement of the pressure regulating device. Thus, the pen tube of the writing tool can avoid internal air pressure imbalance caused by external high temperature or low air pressure. Before the writing tool is shipped from a manufacturer, the deformable member is pressurized in advance, such that the minor air pressure variation formed when a pen cap caps the writing tool offsets the air pressure pre-applied to the deformable member. Accordingly, ink inside an internal chamber does not spout out upon removal of the pen cap and the ink will not be overly dispensed or leak during writing.

A pressure regulating device for a writing tool has a deformable member. Minor air pressure variations in a pen tube of the writing tool can be regulated by deformation of the deformable member. Major air pressure variations in the pen tube can also be regulated by movement of the pressure regulating device. Thus, the pen tube of the writing tool can avoid internal air pressure imbalance caused by external high temperature or low air pressure. Before the writing tool is shipped from a manufacturer, the deformable member is pressurized in advance, such that the minor air pressure variation formed when a pen cap caps the writing tool offsets the air pressure pre-applied to the deformable member. Accordingly, ink inside an internal chamber does not spout out upon removal of the pen cap and the ink will not be overly dispensed or leak during writing.

A cosmetic container having an application member detachably attached to the side of a button member, according to the present invention, include: a container body (10) having a storage space (13); a pump (20) for discharging the content of the container body (10) to the outside; a cap (30) for fixing the pump (20) to the container body (10); the button member (40) coupled to the upper part of the pump (20) and formed to protrude toward the upper part of the cap (30); and the application member (50) detachably attached to the side of the button member (40).

A biodegradable marker pen including a barrel, a cap, and an ink reservoir. The barrel has a hollow cylindrical structure, the ink reservoir is placed in the barrel, and the cap is detachably coupled with the barrel hermetically. The barrel, the cap, and the ink reservoir comprise 2 to 10 mass percentage of a biodegradable masterbatch respectively.

A biodegradable marker pen including a barrel, a cap, and an ink reservoir. The barrel has a hollow cylindrical structure, the ink reservoir is placed in the barrel, and the cap is detachably coupled with the barrel hermetically. The barrel, the cap, and the ink reservoir comprise 2 to 10 mass percentage of a biodegradable masterbatch respectively.

A product dispenser is provided that includes a container within a shell, and a pump and insert for dispensing the product. A spring biases the container and pump away from the tip of the shell. The bottom of the container is pushed up relative to the shell to activate the pump, thereby dispensing the product.

It is an object to provide a cylindrical molded article that is also excellent in smell retention properties for smelling substances in addition to oxygen barrier properties and is also excellent in the fine appearance of a cut surface when cut, and a barrier plug, a barrier plug-attached container, and an tube for storing ink each using the same. A cylindrical molded article comprising a cylindrical resin layer comprising a resin having a melting point of 140 C. or more; and a vapor-deposited layer disposed on an outer peripheral surface of the resin layer, the vapor-deposited layer comprising at least one selected from the group consisting of silicon oxide, aluminum oxide, and diamond-like carbon, and the cylindrical molded article having a total thickness of 100 m or more.

It is an object to provide a cylindrical molded article that is also excellent in smell retention properties for smelling substances in addition to oxygen barrier properties and is also excellent in the fine appearance of a cut surface when cut, and a barrier plug, a barrier plug-attached container, and an tube for storing ink each using the same. A cylindrical molded article comprising a cylindrical resin layer comprising a resin having a melting point of 140 C. or more; and a vapor-deposited layer disposed on an outer peripheral surface of the resin layer, the vapor-deposited layer comprising at least one selected from the group consisting of silicon oxide, aluminum oxide, and diamond-like carbon, and the cylindrical molded article having a total thickness of 100 m or more.

It is an object to provide a cylindrical molded article that can inhibit the transmission of components having SP values in a relatively wide range. A cylindrical molded article having a cylindrical resin layer I comprising a vinylidene chloride copolymer; and a cylindrical resin layer II disposed inside the resin layer I and comprising a resin having an SP value of 12.0 (cal/cm.sup.3).sup.1/2 or more, and having a total thickness of 100 m or more.