A method of manufacturing a seamless inflatable ball contains: 1) inflating air into a preformed body so as to form a spherical body and covering a medium layer on the spherical body so as to form a semi-finished part; 2) forming a fluidic surface material on the medium layer of the semi-finished part in a predetermined thickness so as to produce a spherical portion with a covering layer; 3) placing the spherical portion into two ball molds; and 4) partially discharging air out of the spherical body and inflating the air into the spherical body repeatedly. In the step 3), the spherical portion is clamped in the two ball molds, and after the fluidic surface material is dried or is solidified to form a solid layer on the spherical portion, the spherical portion is removed from the two ball molds, thus forming a sphere.

A tape is disclosed for use with a ball having a seam, wherein the seam has a predetermined seam color. The tape includes an adhesive layer formed of an adhesive material configured to attach to the seam, and a carrier layer formed of a carrier layer material, wherein the carrier layer has a custom color that is different than the predetermined seam color. Additionally, methods are disclosed for customizing a color of the seam of the ball using multiple tape segments. Still further, a kit is disclosed that includes the ball, a first tape having a first custom color, and a second tape having a second custom color.

In an aspect, a sports ball includes a core including a negative Poisson's ratio (NPR) foam material, in which the core has a Poisson's ratio of between 0 and −1, and in which the NPR foam material includes an NPR polymer foam; and a cover layer surrounding the core. In an aspect, a golf club includes an elongated shaft; a grip disposed at a first end of the elongated shaft; and a head connected to a second end of the elongated shaft, the head having a flat face configured for contact with a golf ball, in which the flat face is formed of a negative Poisson's ratio (NPR) foam material, in which the head has a Poisson's ratio of between 0 and −1, and in which the NPR foam material includes an NPR metal foam, an NPR ceramic foam, or an NPR-PPR composite foam.

The present invention relates to a freeze-drying mold and a method for manufacturing water-soluble polymer balls using the same, more specifically to a freeze-drying mold that is provided with a first mold having a plurality of first accommodation grooves formed on underside thereof and a plurality of discharge portions formed on top thereof to communicate with the plurality of first accommodation grooves and a second mold having a plurality of second accommodation grooves formed on top thereof to be facingly coupled to the plurality of first accommodation grooves of the first mold to thus provide a plurality of accommodation portions, and a method for manufacturing water-soluble polymer balls using the same.

According to the present invention, the freeze-drying mold is capable of controlling the shrinkage rate of a solution in a freeze-drying process to make freeze-dried spherical materials, easily separating the made freeze-dried materials therefrom, and optimizing a drying efficiency thereof, and the method for manufacturing water-soluble polymer balls using the same is carried out so that the water-soluble polymer balls are constant in pore sizes and distributions, have high strength, and do not have any films on the surfaces thereof.

A method of manufacturing golf balls having a core and a cover of at least one layer encasing the core includes the steps of producing a core by molding and vulcanizing a rubber composition containing (A) a base rubber, (B) an α,β-unsaturated carboxylic acid and/or a metal salt thereof, and (C) an organic peroxide; and heat-treating the core for 1 to 24 hours at between 175 and 300° C. Golf balls which undergo little energy loss and have a high initial velocity can be obtained by this method.

In the process of making a hollow product, especially a deformable toy ball, two halves made from an elastomeric material, a thermoplastic material, rubber, a blend of rubbers, or a thermoplastic elastomer are formed by injection molding with mating edges that engage with each other when the halves are assembled to form the product. The edge of one of the two halves is advantageously formed with a recess centered in the edge, in which a flange formed on the edge of the other of the two halves engages to provide a form-fitting connection between the two halves. The opposing edges are then bonded with each other by fusion or melting or by an adhesive applied to at least one of the edges prior to assembling the halves together. A deformable ball produced by the process is also described.

The present invention is directed to golf balls having improved aerodynamic performance due, at least in part, to the alteration of the dimple surfaces. In particular, the present invention relates to a golf ball that includes at least a portion of its dimples having circular perimeters and dimple profiles having a concentric groove or a non-concentric groove on the surface of the dimple. The golf ball dimples of the present invention provide golf ball surfaces having unique appearances, while maintaining ideal aerodynamic characteristics.

A frac stage isolation device including instruments for measuring pressure, temperature, salinity, pH, electromagnetic waves and/or other physical parameters such as vibrations from acoustic energy emissions during a hydraulic fracturing process. The frac stage isolation device blocks a flow passage in a frac plug to isolate a previously fracked section of a wellbore. The frac stage isolation device may also be used without a frac plug in applications requiring data acquisition.

A method of manufacturing golf balls having a core and a cover of at least one layer encasing the core includes the steps of producing a core by molding and vulcanizing a rubber composition containing (A) a base rubber, (B) an α,β-unsaturated carboxylic acid and/or a metal salt thereof, and (C) an organic peroxide; and heat-treating the core for 1 to 24 hours at between 175 and 300° C. Golf balls which undergo little energy loss and have a high initial velocity can be obtained by this method.

A three-dimensional object printing apparatus includes a liquid ejecting head that ejects a liquid to three-dimensional work, and a moving mechanism that changes a relative position of the liquid ejecting head with respect to the work. The moving mechanism includes a number N (N is a natural number of 2 or greater) of joints rotatable around different rotational axes. When a printing operation that causes the liquid ejecting head to eject a liquid while causing the moving mechanism to change the relative position of the liquid ejecting head with respect to the work is executed, the number of joints that rotate during the printing operation among the number N of joints is M (M is a natural number smaller than N).