Patent Application
20170291074
The invention belongs to a ball sport apparatus, in particular to a baseball/softball.
The baseball/softball of the invention refers to a baseball or a softball.
Existing baseball/softball is wrapped with a PU layer cover, and external layer of core is directly wrapped with PU material. Due to low coefficient of resilience, such material tends to deform. Once deformed or staved, it is hard to recover its shape. Further, lacking sticky sense of cow leather, it feels slippery and produces poor gripping force. With poor adhesion, the cover of the ball may be delaminated from the core after being batted. Moreover, the PU material has chemical smell rather than unique smell of cow leather, which has an overall impact on unique historical culture of traditional baseball/softball.
Existing processing technology of traditional baseball/softball includes leather cutting by a cutting die designed consistent with size of the core, and manual suturing. In peak season, it is not easy to employ mature workers. The low working efficiency of apprentices and high training costs may cause low yield. Thus, products may not be delivered on time.
The invention provides a baseball/softball for producing a more solid ball.
The invention also provides a method of processing baseball/softball for improving its yield and quality stability.
The invention further provides a material formula of a baseball/softball cover for achieving good adhesion between the core and the cover to avoid delamination, and similar sense of the baseball/softball of leather material.
The objective of the invention is to improve service life, compression resistance, number of times against batting, COR and bounce coefficient of the baseball/softball.
The technical scheme used in the invention for solving the technical problem is as follows:
A baseball/softball comprises a core and a cover, the core is wrapped with a layer of fiber material, particularly, a layer of fiber material soaked with rubber and added to the core being independently molded, the layer of fiber material is wrapped and glued with the cover, the layer of fiber material consists of more than one layer of wool and one layer or more of TR (polyester viscose blended) yarn outside the layer of wool; the cover material is made based on a formula comprising a rubber, a pulverized cow leather material, and a rubber vulcanizing agent, with a mixing and breaking process, wherein the rubber vulcanizing agent contains a sulfur, a softening oil, a precipitated calcium carbonate or a ground calcium carbonate; the core, the layer of wool and the layer of TR (polyester viscose blended) yarn for wrapping the core are directly placed into the cover material that has been mixed and applied but not yet molded, and into a mold together with the cover material for mold stripping along with the cover through high-temperature vulcanization; the gluing process is realized between a vulcanization melting layer formed on inner wall of the cover and the layer of fiber material.
The gluing process is realized between a vulcanization melting layer formed on inner wall of the cover and the layer of fiber material.
In terms of the gluing form, the method of processing the baseball/softball comprises wrapping the core with the layer of fiber material, placing the core and the layer of fiber material into the cover material that is applied but not molded, placing the core, the layer of fiber material outside the core and the layer of cover material outside the layer of fiber material into a mold; molding the layer of cover material into the cover through a vulcanization process, gluing a vulcanization melting layer formed on inner wall of the cover to the layer of fiber material, and finally taking the finished product out of the mold.
The material formula of the cover of the baseball/softball is characterized by comprising at least a rubber and a pulverized cow leather.
The material formula further comprises a rubber vulcanizing agent containing a precipitated calcium carbonate or a ground calcium carbonate, a softening oil and a sulphur.
The benefits of the invention are as follows:
In a baseball/softball made according to the method of the invention, a layer of fiber material soaked with rubber is added to an independently formed core; thus, the cover and the core are more firmly fit during cover molding, and the porous structure in the fiber material is certainly inspiratory, greatly avoiding bubbles appeared in cover molding, thus improving quality and service life of the ball. For a cover made by wrapping the core with the mixed materials of rubber and pulverized cow leather by a formula, it feels more approximate to cow leather in smell and hand feel; moreover, based on emulation technique, unique sticky sense and resilience force of rubber give the product the hand feel and functions (i.e., better resilience, pressure resistance and impact resistant times) of traditional baseball/softball. From the perspectives of smell, touch and visual sense, the product has good simulation effect of baseball/softball and better service effect.
The core of the baseball/softball can be selected from that made by prior art or independent molded from rubber, PU, wool and other materials according to different formula and processes.
With such fiber materials as wool and TR (polyester viscose blended) yarn, the core can be wrapped in multiple layers, in which these fibers are soaked with rubber and then wrapped around the core.
In order to allow the materials of rubber cover to obtain better simulation effect of cow leather in smell, hand feel and functions, the pulverized cow leather is added into the formula to give the cover material the smell of leather genes. When used as a filling material, it can alleviate weight of the cover and increase its occlusive action, hardness and stress. The formula consists of a rubber, a pulverized cow leather, a precipitated calcium carbonate or ground calcium carbonate, a sulfur, an oil and other rubber agents (dosage ratio and materials of the formula are adjusted according to changes in the weather to achieve a good shape, less bubbles, resistance to yellowing, anti-aging and other standard requirements for hardness and bounce).
One process of the invention comprises mixing and breaking up the cover material, cutting and tabletting the cover material according to the weight of the cover, and placing it into a mold for vulcanization molding at high temperature. The circumference and weight of the cover is adjusted according to the circumference and weight of the core. For example, the standard weight of a finished product is 145 g±3 g (i.e. 142-148 g), and the circumference of it is 8.75-9.25 in. If the core weighs 120 g, the cover should weigh 25 g±3 g. The circumference of the cover is determined in the same way. The temperature and time shall be adjusted according to the formula too.
A layer of viscose glue is applied to the layer of fiber material outside the core, and then it is arranged into two or more vulcanized covers. Standing a while, they are fused as a whole.
The process therefore produces a baseball/softball with the core wrapped with a layer of fiber material and the layer of fiber material wrapped and glued with a cover.
The invention provides another process, i.e. the core and the fiber layer outside the core are directly placed into the cover material after mixing and breaking but before molding, and into a mold together with the cover material for mold stripping along with the cover under high-temperature vulcanization.
The process produces a baseball/softball with the core wrapped with the layer of fiber material and the layer of fiber material wrapped with a cover, and with the vulcanization melting layer formed on inner wall of the cover glued to the layer of fiber material.
Finally, the cover is provided with traditional lines of leather baseball/softball and painted with the same number of suturing pattern.
Taking a successfully developed structure of a wool core with a cover as an example, a small rubber core of 34 MM (made from more than ten materials including rubber, precipitated calcium carbonate or ground calcium carbonate powder, sulfur and other rubber vulcanization additives, through mixing and breaking, cutting and vulcanization) has specific circular weight. After molding, the core is layered by rough and fine wools (commonly, inside rough wool+outside fine wool, or three layers of fine wool, for wrapping the rubber core respectively to achieve pressure resistance, bounce coefficient, COR, impact-resistant property and anti-deformation that other finished products can have). After the core is wrapped with the wool yarn, it should be wrapped with one layer or more of TR (polyester viscose blended) yarn of different thickness (to form the outermost layer from the regulation layer for adjusting circumference and weight of the cover of the baseball/softball, and finally meet the standard requirements for the circumference and weight of the finished ball, including surface flatness). Most of the fiber material shall have high temperature resistance, high breaking strength, yarn twist, moisture content and other quality requirements. Meanwhile, the cover material is made based on a formula comprising a rubber, a pulverized cow leather material, precipitated calcium carbonate or ground calcium carbonate, a sulfur, a softening oil and other rubber vulcanizing agents, with a mixing and breaking process. Then, the core, the wool layer and the TR (polyester viscose blended) yarn layer outside the core are directly placed into the cover material after mixing and breaking but before molding, and into a mold together with the cover material for mold stripping along with the cover through high-temperature vulcanization. The whole ball is therefore obtained. Finally, the cover is provided with traditional lines of leather baseball/softball and painted with the same number of suturing pattern.
The invention overcomes the comprehensive shortcomings of traditional baseball/softball (in artificial processing and quality control), and replaces manual stitching process and cover material (of traditional leather) with machine processing and (rubber material), thus changing the situation of extremely low production and difficult recruitment and training, improving yield and obtaining stable quality. In addition to high productivity, the processing obtains more stable product functions, and even enhances product quality and times of resistance to batting. Compared with the baseball/softball wrapped with PU material showing low coefficient of resilience, easy deformation, strong smell of chemical ingredients, non-sticky hand feel and low simulation, the formula combining rubber with pulverized cow leather ensures good adhesion and seizure property between the core and the cover in service to avoid delamination, and presents high simulation in smell, hand feel, bounce and more culture genes of baseball/softball.
In a baseball/softball made according to the method, the layer of fiber material soaked with rubber is added to the independent molded core, thus, the cover and the core are more firmly fit during cover molding; and the porous structure in the fiber material is certainly inspiratory, thereby greatly avoiding bubbles appeared in cover molding, thus improving quality and service life of the ball. Moreover, the frequency resistant to batting of the core without a layer of fiber material soaked with rubber is lower than the core to which a layer of fiber material soaked with rubber is added.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201410855914.6 | Dec 2014 | CN | national |
The present application is a continuation-in-part application of PCT application No. PCT/CN2015/000517 filed on Jul. 20, 2015 which claims the benefit of Chinese Patent Application No. 201410855914.6 filed on Dec. 26, 2014, the contents of which are hereby incorporated by reference.
| Number | Date | Country | |
|---|---|---|---|
| Parent | PCT/CN2015/000517 | Jul 2015 | US |
| Child | 15632411 | US |
