TWI477306B - Method for compression molding a dual core for a golf ball - Google Patents

Description

Method for compression molding a dual core of a golf ball background

Embodiments of the present invention generally relate to a system and method for compression molding a dual core of a golf ball.

Golf tournaments are an increasingly popular sport at both the amateur and professional levels. A wide range of techniques relating to the manufacture and design of golf balls are well known in the art. For example, one method of making a golf ball includes compressing a molded core. When using this method to create a dual core (with a two-layer core), this method requires most steps including temperature changes. For example, the method can include cooling the mold between molding steps. It would be advantageous to have fewer steps to include fewer temperature changes to produce a dual core.

summary

A method and system for compression molding a dual core of a golf ball is disclosed. The method can generally include a first cycle and a second cycle. The first cycle can include compression molding a plurality of concave outer casings between a top plate and an intermediate form and compression molding a plurality of concave outer casings between the intermediate form and a bottom form. The recessed outer casings later form an outer core layer of one of the pair of golf cores. During the first cycle, the top template and the bottom template can be maintained at a first temperature T1 and the intermediate template can be maintained at a second temperature T2 substantially below the first temperature T1. In the first loop, the templates can be Pressing a first pressure P1 together for a first time t1.

This second cycle completes the curing of the recessed enclosure around a solid core, and the solid core later forms the core layer within one of the dual cores. The second cycle can include placing the solid core between the concave outer casings and compression molding the concave outer casing around the solid core. During the second cycle, the top template and the bottom template can be maintained at the first temperature T1 and the intermediate template can be removed between the top template and the bottom template. During the second cycle, the top template and the bottom template may be pressurized together by a second pressure P2 for a second time t2. The second pressure P2 may be substantially higher than the first pressure P1 and the second time t2 may be substantially longer than the first time t1.

In one aspect, the invention provides a method comprising providing a compression molding apparatus having a top template, an intermediate template, and a bottom template. The method may further include placing a first core material between the top template and the intermediate template and placing a second core material between the intermediate template and the bottom template while maintaining the top template and the bottom template At the first temperature T1 and maintaining the intermediate template at a second temperature T2. The method can include pressurizing a first core material between the top template and the intermediate template to form at least one top concave outer casing and pressurizing a second core material between the intermediate template and the bottom template to form at least one Bottom recessed housing. The method can include placing a solid core between the at least one female housing and the at least one female housing. The method can include simultaneously pressing the at least one recessed outer casing and the at least one undercut outer casing between the top stencil and the bottom stencil while maintaining the top stencil and the bottom stencil at the first temperature T1. The second temperature T2 can be about 30 ° C to about 70 ° C lower than the first temperature T1. The first temperature T1 can range from about 125 ° C to about 195 ° C. The first temperature T1 can range from about 140 °C to about 180 °C. The second temperature T2 can range from about 70 °C to about 130 °C. The second temperature T2 can range from about 85 °C to about 115 °C. The first core material and the second core material may each comprise a diene-containing composition.

In another aspect, the invention provides a method comprising providing a compression molding apparatus having a top template, an intermediate template, and a bottom template. The method can further include placing a first core material between the top template and the intermediate template. The method can include placing a second core material between the intermediate template and the bottom template. The method can include pressurizing a first core material between the top template and the intermediate template at a first pressure P1 to form at least one top and bottom outer casing. The method can include pressurizing a second core material between the intermediate die and the bottom die plate at a first pressure P1 to form at least one bottomed outer casing. The method can include placing a solid core between the at least one female housing and the at least one female housing. The method may include pressurizing the at least one recessed outer casing and the at least one recessed outer casing between the top plate and the bottom plate plate together with a second pressure P2, wherein the second pressure P2 is substantially greater than the first pressure P1. The first pressure P1 may range from about 85 kg/cm ² to about 115 kg/cm ² . The first pressure P1 may range from about 95 kg/cm ² to about 105 kg/cm ² . The second pressure P2 may range from about 130 kg/cm ² to about 170 kg/cm ² . The second pressure P2 may range from about 145 kg/cm ² to about 155 kg/cm ² .

The step of pressurizing the first core material between the top template and the intermediate template to form at least one top concave outer casing may further comprise maintaining the top template and the bottom template at the first temperature T1. Pressurizing the intermediate template and the bottom The step of forming the second core material between the stencils to form the at least one bottomed outer casing may further comprise maintaining the top stencil and the bottom stencil at the first temperature T1. The step of pressurizing the at least one recessed outer casing and the at least one recessed outer casing between the top stencil and the bottom stencil may further comprise maintaining the top stencil and the bottom stencil at the first temperature T1. The top template may include at least one female mold cavity, the intermediate mold may include at least one top protrusion and at least one bottom protrusion opposite the at least one top protrusion, and the bottom template may include at least one concave mold cavity. The step of placing a first core material between the top template and the intermediate template can include placing the first core material on the at least one top protrusion. The step of placing a second core material between the intermediate template and the bottom template can include placing the second core material in at least one of the concave mold pockets of the bottom template.

In another aspect, the invention provides a method comprising providing a compression molding apparatus having a top template, an intermediate template, and a bottom template. The method can include heating the top template and the bottom template. The method can include heating the intermediate template. The method can include placing a first core material between the top template and the intermediate template. The method can include placing a second core material between the intermediate template and the bottom template. The method can include pressurizing the first core material between the top plate and the intermediate plate for a first time t1 to form at least one top and bottom outer casing. The method can include pressurizing the second core material between the intermediate die and the bottom die for a first time t1 to form at least one bottomed outer casing. The method can include placing a solid core between the at least one female housing and the at least one female housing. The method can include pressing the at least one top and outer casing between the top plate and the bottom plate together for a second time t2. The second time t2 can be greater than the first time t1 to 5 times less. The first time t1 can range from about 30 seconds to about 90 seconds. The second time t2 can range from about 400 seconds to about 550 seconds.

The step of pressurizing the first core material between the top template and the intermediate template to form at least one top concave outer casing may include maintaining the top template and the bottom template at the first temperature T1. The step of pressurizing the second core material between the intermediate template and the bottom template to form at least one bottomed outer casing may include maintaining the top template and the bottom template at the first temperature T1. The step of simultaneously pressing at least one of the top and bottom recesses between the top and the bottom form may include maintaining the top and bottom templates at the first temperature T1.

The step of pressurizing the first core material between the top template and the intermediate template to form at least one top concave outer casing may include pressurizing the first core between the top template and the intermediate template at a first pressure P1 material. The step of pressurizing the second core material between the intermediate template and the bottom plate to form at least one bottomed outer casing may further comprise pressurizing a second between the intermediate plate and the bottom plate with a first pressure P1 Core material. Pressing at least one of the top recessed casing and the at least one recessed casing between the top formwork and the bottom formwork may include pressurizing the at least one top concave outer casing and the at least one bottom concave outer casing with a second pressure P2, Wherein the second pressure P2 is substantially greater than the first pressure P1.

Other systems, methods, features, and advantages of the present invention will be or become apparent to those skilled in the <RTIgt; All such additional systems, methods, features, and advantages are intended to be included within the scope of the invention and are intended to be within the scope of the invention and

100‧‧‧ Golf

110‧‧‧ inner core

120‧‧‧ outer core layer

130‧‧‧ inner cover

140‧‧‧ outer cover

200, 202, 204, 206, 208, 210, 212, 214, 216, 218, 220, 222‧ ‧ steps

300‧‧‧ top template

302‧‧‧ cavity

304‧‧‧Top protrusion

306‧‧‧ bottom protrusion

308‧‧‧ cavity

310‧‧‧ intermediate template

320‧‧‧ bottom template

330‧‧‧flat surface

332‧‧‧First flat surface

334‧‧‧Second flat surface

336‧‧‧flat surface

400‧‧‧metal block

402‧‧‧metal block

600,602‧‧‧ concave shell

800‧‧‧solid core

The invention will be better understood with reference to the following drawings and description. The components in the figures are not necessarily to scale, In addition, in the drawings, like reference characters refer to the

1 shows a demonstration ball having one of the dual cores formed by the disclosed method; FIG. 2 shows the steps of an exemplary embodiment of the method; FIG. 3 shows an exemplary compression molding process for implementing one of the exemplary methods of FIG. Figure 4 shows the metal block of the core material placed on the assembly of the compression molding apparatus; Figure 5 shows the metal block from Figure 4 and the assembly of the compression molding device from another figure; Figure 6 shows that it is pressed The top template, the intermediate template and the bottom template of the compression molding device together; FIG. 7 shows the separated top template, the intermediate template and the bottom template; FIG. 8 shows that the top template and the bottom template move toward each other; and FIG. 9 shows the top The template and the bottom template are pressed together.

Detailed description

1 shows an exemplary golf ball 100 having one of the cores formed by the exemplary method described with reference to FIGS. 2-8. The golf ball 100 can include an outer cover 140 and an inner cover 130. The golf ball 100 may further include a dual core The core has an outer core layer 120 and an inner core layer 110.

In certain embodiments, outer core layer 120 can have a thickness ranging from about 1 mm to about 12 mm. In certain embodiments, outer core layer 120 can have a thickness ranging from about 3 mm to about 10 mm. In certain embodiments, outer core layer 120 can have a thickness ranging from about 4 mm to about 7 mm.

In certain embodiments, inner core layer 110 can have a diameter ranging from about 12 mm to about 32 mm. In certain embodiments, inner core layer 110 can have a diameter ranging from about 19 mm to about 30 mm. In certain embodiments, inner core layer 110 can have a diameter ranging from about 21 mm to about 28 mm.

The core material used to make the outer core layer 120 can comprise any suitable type of core material. For example, in certain embodiments, the core material can include a diene containing composition, such as polybutadiene. In certain embodiments, the diene-containing composition can include a crosslinking agent, an organic peroxide, and/or a filler. The type of core material used to make the outer core layer 120 can be selected based on a variety of factors. For example, the outer core material can be selected based on the desired elastic recovery coefficient and/or the desired specific gravity of the outer core layer.

In some embodiments, a polybutene having a cis 1,4 bonding ratio equal to or greater than 60 mol% may be used as the outer core material. In certain embodiments, the polybutadiene may have a cis 1,4 bonding ratio equal to or greater than 80 mol%. In certain embodiments, a rare earth element-catalyzed polybutadiene can be used in the outer core to achieve an excellent elastic performance of a golf ball. Examples of rare earth element catalysts may include lanthanide rare earth element combinations , organoaluminum compounds and aluminoxanes and halogen compounds.

In certain embodiments, a crosslinking agent can be provided in the outer core material, and the crosslinking agent includes zinc diacrylate, magnesium acrylate, zinc methacrylate, or magnesium methacrylate. In certain embodiments, zinc diacrylate can provide advantageous elastic properties.

In certain embodiments, an organic peroxide can be provided in the outer core material, and the organic peroxide comprises dicumyl peroxide, 1,1-bis(tertiary butyl peroxy)- 3,3,5-trimethylcyclohexane, 2,5-dimethyl-2,5-di(tri-butylperoxy)hexane, or di-tertiary butyrate. In certain embodiments, the organic peroxide can be provided on a basis of 100 parts by weight of polybutadiene, from about 0.2 to about 5 parts by weight. In certain embodiments, the organic peroxide can be provided in an amount of from about 0.5 to about 3 parts by weight based on 100 parts by weight of the polybutadiene.

In certain embodiments, a filler may be provided in the outer core material. The filler can be used to increase the specific gravity of the material. The filler may include zinc oxide, barium sulfate, calcium carbonate, or magnesium carbonate. A metal powder such as tungsten may also be used as a filler to achieve a desired specific gravity. In certain embodiments, the outer core layer may have a specific gravity of from about 1.05 g/cm ³ to about 1.45 g/cm ³ . In certain embodiments, the outer core layer may have a specific gravity of from about 1.05 g/cm ³ to about 1.35 g/cm ³ .

The core material used to make the inner core layer 110 can include any suitable type of core material. For example, in certain embodiments, inner core layer 110 can be formed primarily of a thermoset material, such as a diene containing composition, a crosslinked metallocene catalyzed polyolefin, polyfluorene oxide, and combinations thereof. In some embodiments, The inner core layer 110 may be mainly composed of a thermoplastic material such as an ionic polymer resin, a high neutralizing acidic polymer composition, a polyamide resin, a polyester resin, a polyurethane resin, and Combined formation. The type of core material used to make it can be selected based on a variety of factors. For example, the inner core material can be selected based on the desired elastic recovery coefficient and/or the desired specific gravity of the inner core layer.

In certain embodiments, the core material used to make the inner core layer 110 can include at least two high neutralizing acidic polymer compositions. In certain embodiments, the at least two high neutralizing acidic polymer compositions can be dry blended or combined in an extruder. In certain embodiments, the inner core layer can comprise a first high-neutralized acidic polymer composition having a low flexural modulus and a second high-neutralized acidic polymer having a low flexural modulus a mixture of compositions. Examples of the high-medium and acidic polymer composition having a low modulus of curvature include HPF resins such as HPF1000, HPF2000, HPF1035 and HPF AD1040, both manufactured by E.I. Dupont de Nemours and Company. The first and second high neutralized acidic polymer compositions have a flexural modulus ranging from about 1,000 psi to about 45,000 psi. In certain embodiments, the first and second high neutralized acidic polymer compositions have a flexural modulus ranging from about 1,000 psi to about 40,000 psi. In other embodiments, the first and second high neutralized acidic polymer compositions have a flexural modulus ranging from about 1,000 psi to about 35,000 psi.

In certain embodiments, the ratio of the first high neutralized acidic polymer composition to the second high neutralized acidic polymer composition can range from 20:80 to 80:20. In other embodiments, the first high neutralizing acidity The ratio of the polymer composition to the second high neutralized acidic polymer composition may range from 40:60 to 60:40. In certain embodiments, the isotactic neutralized acidic polymer can be prepared by neutralizing an acid to a level equal to or greater than 80%, including up to 100%, by a source of cations such as magnesium, sodium, zinc or potassium. Inner core layer 110 can optionally include additives, fillers, and/or melt flow modifiers. Suitable additives and fillers may include, for example, blow molding and foaming agents, optical brighteners, colorants, phosphors, whitening agents, UV absorbers, light stabilizers, defoamers, processing aids, mica, talc Powder, nano filler, antioxidant, stabilizer, softener, aroma component, plasticizer, impact modifier, acid copolymer wax, surfactant. Suitable fillers may also include inorganic fillers such as zinc oxide, titanium dioxide, tin oxide, calcium oxide, magnesium oxide, barium sulfide, zinc sulfide, calcium carbide, zinc carbide, tantalum carbide, mica, talc, clay, vermiculite, lead telluride. . Suitable fillers may also include high specific gravity metal powder fillers such as tungsten powder and molybdenum powder. Suitable melt flow improvers can include, for example, fatty acids and salts thereof, polyamines, polyesters, polyacrylates, polyurethanes, polyethers, polyureas, polyols, and combinations thereof.

Figure 2-9 reveals an exemplary method of forming a dual core. Figure 2 provides exemplary steps and Figures 3-9 show such exemplary steps in progress. In some embodiments, the steps of the exemplary method can be implemented in the order presented. In other embodiments, the steps of the exemplary method can occur in any desired order. The method can be carried out using a compression molding apparatus.

3 shows an exemplary compression molding apparatus including a top template 300, a bottom template 320, and an intermediate template 310 disposed between the top template 300 and the bottom template 320. The top template 300 can include a formation There is a flat surface 330 of the majority of the cavities 302. As shown in FIG. 3, the top template 300 can include a plurality of mold cavities 302. In other embodiments, the top template 300 can include a single aperture. The cavity 302 can be concave. The cavity 302 can be hemispherical. In some embodiments, the cavity 302 can include other shapes. The shape of the cavity 302 can be selected based on a variety of factors. For example, the shape of the cavity 302 can be selected depending on the desired shape of the outer core layer 120 or the shape of the cover layers. The bottom template 320 can be the same as the top template 300 and/or the bottom template 320 can be a mirror image of the top template 300. The bottom template 320 can include a flat surface 336 formed with a plurality of cavities 308. As shown in FIG. 3, the bottom template 320 can include a plurality of mold cavities 308. In other embodiments, the bottom template 320 can include a single aperture. Cavity 308 can be concave. The cavity 308 can be hemispherical. In some embodiments, the cavity 308 can include other shapes. The shape of the cavity 308 can be selected based on a variety of factors. For example, the shape of the cavity 308 can be selected depending on the desired shape of the outer core layer 120 or the shape of the cover layers. The cavity 302 and the cavity 308 can be assembled to align with each other such that the die 302 faces the cavity 308 when the top template 300 is placed on the base template 320.

The intermediate template 310 can be assembled to be placed between the top template 300 and the bottom template 320. The intermediate template 310 can include a first planar surface 332 and a second planar surface 334, and a plurality of top projections 304 extend from the first planar surface 332 and a plurality of bottom projections 306 extend from the second planar surface 334. As shown in FIG. 3, the top protrusion 304 and the bottom protrusion 306 may extend in opposite directions from each other. As shown in FIG. 3, the intermediate template 310 can include a plurality of top protrusions 304 and a plurality of bottom protrusions 306. In other embodiments, the intermediate template 310 can include a single top protrusion and a single bottom protrusion. In some embodiments, the top protrusion 304 and the bottom protrusion 306 Can be semi-circular. In some embodiments, the top protrusions 304 and the bottom protrusions 306 can include other shapes. The shape of the top protrusion 304 and the bottom protrusion 306 can be selected according to various factors. For example, the shape of the top protrusion 304 and the bottom protrusion 306 may be selected according to the desired shape of the outer core layer 120 or the desired shape of the inner core layer 110. The top protrusion 304 can be assembled to align with the cavity 302 when the intermediate template 310 is placed under the top template 300 such that the cavity 302 faces the top protrusion 304. The bottom protrusions 306 can be assembled such that the cavity 308 faces the bottom protrusions 306 when the intermediate template 310 is placed on the bottom template 320.

The top protrusions 304 can be assembled to be inserted into the cavity 302, and the cavity 302 can be assembled to receive the top protrusions 304. The bottom protrusions 306 can be assembled to be inserted into the cavity 308, and the cavity 308 can be assembled to receive the bottom protrusions 306.

The top template 300, the intermediate template 310, and the bottom template 320 can be assembled to be heated. The top template 300, the intermediate template 310, and the bottom template 320 can be assembled to be pressurized together such that the top protrusion 304 is inserted into the cavity 302 and the bottom protrusion 306 is inserted into the cavity 308.

Figure 3 shows step 200 in progress. As shown in FIG. 2, step 200 can include aligning the cavity 302 of the top template 300 with the top protrusion 304 of the intermediate template 310 and the cavity 308 and bottom protrusion 306 of the alignment template 320. Figure 3 shows how the templates can be aligned with each other and at a separate position during step 200. The stencils can be aligned such that the cavity 302 is aligned with the top protrusion 304 and the bottom protrusion 306 is aligned with the cavity 308.

Figures 4 and 5 show step 202 in progress. Step 202 can include placing a plurality of metal blocks 400 of uncured core material on top protrusions 304 of intermediate template 310 and placing a plurality of metal blocks 402 of uncured core material in the bottom template. 320 in the cavity 402. Depending on the number of dual cores to be fabricated, the metal block 400 can be placed on some or all of the top protrusions 304 and within some or all of the cavity 308. The metal block 400 can be placed on the top protrusion 304 and in the cavity 308 by any method known in the art. For example, the uncured core material can be extruded into metal blocks 400 and 402 and placed on top protrusion 304 by tool or hand and within cavity 308. As shown in the exemplary embodiment of FIG. 4, the metal block 400 and the metal block 402 may be in the shape of a flower. In other embodiments, the metal blocks 400 and 402 can be curved, hemispherical, or cubic. The formation of the metal blocks can be selected according to a variety of factors. For example, the formation of the metal blocks may depend on the type of core material used, the desired distribution of core material within the cavity during compression molding, and/or the desired thickness of the outer core layer 120. In some embodiments, instead of being placed on top of or on top of the top protrusion 304, a metal block of uncured core material can be placed in the cavity 302. In some embodiments, instead of being placed in the cavity 302 or placed in the cavity 302, a metal block of uncured core material can be placed around the bottom protrusion 306.

Step 204 can include moving top template 300, intermediate template 310, and bottom template 320 together. In some embodiments, only intermediate template 310 and bottom template 320 can be moved to top template 300 at step 204. In some embodiments, the top template 300 and the bottom template 320 can be moved in the direction indicated by the arrow in FIG. 5 at step 204. In some embodiments, the top template 300 and the intermediate template 310 can move together such that the metal block 400 contacts the cavity 302 and the bottom protrusion 306 contacts the metal block 402.

Figure 6 shows step 206, step 208 and step 210 in progress. In some embodiments, step 206 can include pressing top template 300, intermediate template 310, and bottom template 320 together for a first time t1 with a first pressure P1. Figure 6 shows the template pressed together. In some embodiments, the pressure can cause the flat surface 330 of the top template 300 to contact the first flat surface 332 of the intermediate template 310. In some embodiments, the pressure can cause the flat surface 336 of the bottom template 320 to contact the second flat surface 334 of the intermediate template 310. When the top template 300, the intermediate template 310, and the bottom template 320 are pressed together, the metal block 400 can be compressed between the top protrusion 304 and the cavity 302. Similarly, metal block 402 can be compressed between bottom protrusion 306 and cavity 308. The compression between the top protrusion 304 and the cavity 302 can transform the metal block 400 into a concave outer casing 600. Compression between the bottom protrusion 306 and the cavity 308 can transform the metal block 402 into a concave outer casing 602. In certain embodiments, the first pressure P1 can range from about 85 kg/cm ² to about 115 kg/cm ² . In certain embodiments, the first pressure P1 can range from about 95 kg/cm ² to about 105 kg/cm ² . In some embodiments, the first time t1 can range from about 15 seconds to about 105 seconds. In some embodiments, the first time t1 can range from about 30 seconds to about 90 seconds. In some embodiments, the first time t1 can range from about 45 seconds to about 75 seconds.

Step 208 can include heating the top template 300 and the bottom template 320 to a first temperature T1. Step 210 can include heating intermediate template 310 to a second temperature T2. Applying heat and pressure to the concave outer casing 600 and the concave outer casing 602 partially cures the concave outer casings. In certain embodiments, T1 can be higher than T2 to reduce the risk of overcruding the outer core layer.

In certain embodiments, the first temperature T1 can range from about 125 °C to about 195 °C. In certain embodiments, the first temperature T1 can range from about 140 °C to about 180 °C. In some embodiments, the first temperature T1 can range from about 145 ° C to about 170 ° C. In certain embodiments, the second temperature T2 can range from about 70 °C to about 130 °C. In certain embodiments, the second temperature T2 can range from about 85 °C to about 115 °C. In certain embodiments, the second temperature T2 can range from about 90 °C to about 110 °C.

In some embodiments, step 206 can be implemented concurrently with steps 208 and 210. In some embodiments, steps 208 and 210 can be performed prior to step 206. In some embodiments, step 206, step 208, and step 210 can be considered as one of the first loops of the method. This first cycle can be implemented during the first time t1.

Figure 7 shows step 212 and step 214 in progress. Step 212 may include retracting the top template 300 away from the intermediate template 310 and retracting the bottom template 320 from the intermediate template 310. In some embodiments, step 214 can include removing intermediate template 310 between top template 300 and bottom template 320. For example, the intermediate template 310 can be removed by the direction shown by the arrow shown in FIG.

Figure 8 shows step 216 and step 218 in progress. In certain embodiments, step 216 can include placing a plurality of solid cores 800 within a recessed housing disposed in cavity 308. In some embodiments, the solid core 800 can be spherical. In some embodiments, the solid core 800 can include other shapes. The shape of the solid core 800 can be selected based on a variety of factors. For example, the shape of the solid core 800 can be selected depending on the desired shape of the outer core layer 120 or the shape of the cover layers. In some embodiments, the solid core 800 can be formed prior to step 214. In certain embodiments, the solid core 800 can be formed by injection molding or compression molding. In some embodiments, the solid core 800 can be implemented in steps Cool before 214. For example, in some embodiments, the solid core 800 can be cooled to be equal to or lower than room temperature. Cooling the solid core 800 can help stabilize the size and stiffness of the solid cores. Again, it is contemplated that certain properties of the solid cores may be measured prior to performing step 214 to ensure that the solid cores are suitable. For example, the elastic recovery coefficients of the solid cores can be measured.

Step 218 can include moving top template 300 and bottom template 320 together. In some embodiments, only the bottom template 320 can be moved toward the top template 300 at step 218. In some embodiments, at step 218, top template 300 and bottom template 320 can be moved in the direction indicated by the arrows in FIG. In some embodiments, the top template 300 and the bottom template 320 can be moved together such that the flat surface 330 of the top template 300 contacts the first flat surface 332 of the bottom template 320.

Figure 9 shows step 220 in progress. In some embodiments, step 220 can include pressurizing the top template 300 against the bottom template 320 at a second pressure P2 for a time t2 while maintaining the top template 300 and the bottom template 320 at the first temperature T1. Figure 9 shows the templates pressed together. In some embodiments, the second pressure P2 can be substantially higher than the first pressure P1. In certain embodiments, the second pressure P2 can range from about 130 kg/cm ² to about 170 kg/cm ² . In certain embodiments, the second pressure P2 can range from about 145 kg/cm ² to about 155 kg/cm ² . In some embodiments, the second time t2 can range from about 350 seconds to about 600 seconds. In some embodiments, the second time t2 can range from about 400 seconds to about 550 seconds. In some embodiments, the second time t2 can range from about 425 seconds to about 525 seconds. Applying heat and pressure to the concave outer casing 600 and the concave outer casing 602 can cure the concave outer casings and join the concave outer casings together to form a core layer 120 that surrounds the inner core layer 110. In some embodiments, the ratio of the second time t2 to the first time t1 can be at least 5. In some embodiments, step 220 can be considered as a second loop of the method. This second cycle can be implemented during the second time t2. In some embodiments, the concave outer casings may partially cure during the first cycle and the concave outer casings may solidify together around the inner core layer during the second cycle.

Step 222 can include retracting the top template 300 away from the bottom template 320. The cured dual core obtained by this exemplary method can be removed and combined in a golf ball. For example, to form the golf ball 100 shown in FIG. 1, the outer cover 140 and the inner cover 130 may be applied to the dual core. In certain embodiments, the dual cores can be tested to ensure that the dual cores have suitable properties prior to combining the dual cores in a golf ball.

Although various embodiments of the invention have been described, the description is illustrative, and not restrictive, and those of ordinary skill in the art will understand that many embodiments and implementations are possible within the scope of the invention. the way. Therefore, the invention is not limited except in the scope of the appended claims and their equivalents. In addition, various modifications and changes can be made within the scope of the appended claims.

200, 202, 204, 206, 208, 210, 212, 214, 216, 218, 220, 222‧ ‧ steps

Claims (12)

A method of manufacturing a golf ball core, comprising the steps of: providing a compression molding device having a top template, an intermediate template, and a bottom template; placing a first core material comprising an uncured diene-containing composition Between the top template and the intermediate template and a second core material comprising an uncured diene-containing composition between the intermediate template and the bottom template while maintaining the top template and the bottom template in a a temperature T1 and maintaining the intermediate template at a second temperature T2, the second temperature T2 being lower than the first temperature T1; in a first pressing step, pressurizing the top template at a first time t1 a first core material between the intermediate stencils to form at least one top concave outer casing and a second core material positioned between the intermediate stencil and the bottom stencil to form at least one bottom concave outer casing, wherein T1, T2 and t1 are Selected to partially cure the diene-containing composition of the at least one recessed outer shell and the diene-containing composition of the at least one bottom outer shell; removing the intermediate template from the top template and the bottom template; a solid core placed on the Between at least one recessed outer casing and the at least one recessed outer casing; and in a second pressing step, pressurizing the at least one recess between the top plate and the bottom plate together at a second time t2 The outer casing and the at least one recessed outer casing while maintaining the top template and the bottom template at the first temperature T1, wherein r2 is selected such that the diene-containing composition of the at least one top-concave outer casing and the at least one bottom a diene-containing composition of a concave outer shell Cured, and where t2 is longer than t1. The method of claim 1, wherein the second temperature T2 is 30 ° C to 70 ° C lower than the first temperature T1. The method of claim 1, wherein the first temperature T1 ranges from 125 ° C to 195 ° C. The method of claim 3, wherein the first temperature T1 ranges from 140 ° C to 180 ° C. The method of claim 3, wherein the second temperature T2 ranges from 70 ° C to 130 ° C. The method of claim 5, wherein the second temperature T2 ranges from 85 ° C to 115 ° C. The method of claim 1, wherein the solid core is formed of a thermosetting material or a thermoplastic material. The method according to Claim 1 patentable scope, wherein performing at 85kg / cm ² to 115kg / cm of the first pressure P1 ² in the first pressurizing step of pressurizing system; and, in the second pressing step The pressurization is performed at a second pressure P2 of 130 kg/cm ² to 170 kg/cm ² . The method of claim 8, wherein the first pressure P1 ranges from 95 kg/cm ² to 105 kg/cm ² . The method of claim 8, wherein the second pressure P2 ranges from 145 kg/cm ² to 155 kg/cm ² . The method of claim 1, wherein the first time t1 ranges from 30 seconds to 90 seconds. For example, the method of claim 1 of the patent scope, wherein the second time t2 The system is from 400 seconds to 550 seconds.