Provided is a writing instrument including a pen cap, a pen tip and a pen barrel, wherein the pen tip is arranged at one end of the pen barrel, an ink cartridge configured to store ink is formed at the other end of the pen barrel, and the pen cap able to be removed is provided on the pen barrel for covering the pen tip; wherein the writing instrument further includes: an ink delivery assembly including a first tube body, a second tube body, a liquid guiding column and liquid absorbent cotton, wherein the second tube body is inserted into the first tube body, the liquid guiding column is inserted into the second tube body, the liquid absorbent cotton is arranged inside the first tube body, an inner end of the pen tip is inserted into the first tube body, and an end of the first tube body which is away from the pen tip is opened with a first vent and an end of the second tube body which is close to the pen tip is opened with a second vent; the first tube body is arranged in the pen barrel; an air flow channel is formed between an inner wall of the pen barrel and the first tube body; the second tube body is in communication with the ink cartridge; a part of the pen barrel corresponding to where the pen tip is arranged is provided with a plurality of ribs, and an air inlet is enclosed by the pen tip and any two adjacent ribs, and the air inlet is in communication with the air flow channel. The writing instrument could increase ink storage capacity and avoid ink leakage, thereby improving user experience.

The instant disclosure is directed to a heterogeneous fiber fluid reservoir for holding and delivering fluid. A reservoir may comprise a rod having a core component and a surrounding component. Each of the core component and the surrounding component may comprise fibers. The core component may have a first property, and the surrounding component may have a second property different from the first property, or the core component and the surrounding component may each have a different value or range of values for the same property. Alternatively, a reservoir may comprise a rod that includes fibers and has a cross-sectional diameter. At least one property of the rod may vary in value along the cross-sectional diameter of the rod. The property may include, for example, fiber bulk density, fiber diameter, fiber material, fiber morphology, fiber surface tension, capillary force, fluid absorption capacity, color, or combinations thereof.

The instant disclosure is directed to a heterogeneous fiber fluid reservoir for holding and delivering fluid. A reservoir may comprise a rod having a core component and a surrounding component. Each of the core component and the surrounding component may comprise fibers. The core component may have a first property, and the surrounding component may have a second property different from the first property, or the core component and the surrounding component may each have a different value or range of values for the same property. Alternatively, a reservoir may comprise a rod that includes fibers and has a cross-sectional diameter. At least one property of the rod may vary in value along the cross-sectional diameter of the rod. The property may include, for example, fiber bulk density, fiber diameter, fiber material, fiber morphology, fiber surface tension, capillary force, fluid absorption capacity, color, or combinations thereof.

A writing instrument comprises a hollow body having a first end and a second opposite end along a longitudinal axis (X); a deformable tank inside the hollow body and containing ink; a writing tip disposed at the first end of the hollow body and in fluid communication with the deformable tank; and a deformation device configured to squeeze the deformable tank along the longitudinal axis (X) so as to move forward towards the writing tip the ink contained in the deformable tank.

A writing instrument comprises a hollow body having a first end and a second opposite end along a longitudinal axis (X); a deformable tank inside the hollow body and containing ink; a writing tip disposed at the first end of the hollow body and in fluid communication with the deformable tank; and a deformation device configured to squeeze the deformable tank along the longitudinal axis (X) so as to move forward towards the writing tip the ink contained in the deformable tank.

An applicator includes a partition wall for partitioning between a storage chamber and a reservoir chamber, an application body that allows application of a liquid stored in the storage chamber, a relay member that transfers the liquid stored in the storage chamber passing through the partition wall toward the application body, a gas-liquid exchanging section formed at the partition wall for air-liquid exchanging with the liquid stored in the storage chamber, an occluding body that is disposed in the reservoir chamber, and in contact with the relay member for occluding the liquid, and a movement prevention section disposed at the relay member and/or the occluding body for preventing movement of the liquid held in the occluding body to the relay member.

An applicator includes a partition wall for partitioning between a storage chamber and a reservoir chamber, an application body that allows application of a liquid stored in the storage chamber, a relay member that transfers the liquid stored in the storage chamber passing through the partition wall toward the application body, a gas-liquid exchanging section formed at the partition wall for air-liquid exchanging with the liquid stored in the storage chamber, an occluding body that is disposed in the reservoir chamber, and in contact with the relay member for occluding the liquid, and a movement prevention section disposed at the relay member and/or the occluding body for preventing movement of the liquid held in the occluding body to the relay member.

A writing felt pen including a barrel and a nib attached to the barrel, and a deformable pouch comprising a mix of absorbent polymer and fibres, an ink being absorbed in the absorbent polymer and the nib being in fluidic communication with the mix.

A writing felt pen including a barrel and a nib attached to the barrel, and a deformable pouch comprising a mix of absorbent polymer and fibres, an ink being absorbed in the absorbent polymer and the nib being in fluidic communication with the mix.

An ink reservoir unit for a writing instruments using an ink reservoir tube with which low contamination can be achieved considering environmental problems; and a writing instruments using the same. The ink reservoir tube is composed of a composite material in which a raw material is layered on a paper substrate having paper as a substrate. One end section of the ink reservoir tube is coupled to a connection part formed on a writing member or a relay member that holds the writing member to constitute the ink reservoir unit for a writing instrument. In one preferred aspect, a locking means using a male thread formed on an outer peripheral surface is provided to the connection part to be connected to the ink reservoir tube, and the ink reservoir tube is coupled to the relay member that holds the writing member by the locking means.