CN115867361A - 高尔夫球及其制造方法 - Google Patents
高尔夫球及其制造方法 Download PDFInfo
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- CN115867361A CN115867361A CN202180043297.8A CN202180043297A CN115867361A CN 115867361 A CN115867361 A CN 115867361A CN 202180043297 A CN202180043297 A CN 202180043297A CN 115867361 A CN115867361 A CN 115867361A
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- density
- golf ball
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Abstract
根据本发明的高尔夫球,其特征在于,包括:球芯,平均直径为37~39mm,并具有第一密度;覆盖层,具有0.8~1.2mm的厚度以围绕所述球芯,并包含非晶质合金粉末,具有第二密度;以及外壳,具有1~1.4mm的厚度以围绕所述覆盖层,并且具有第三密度。
Description
技术领域
本发明涉及一种包含非晶质合金粉末的高尔夫球。
背景技术
高尔夫球是高尔夫中所使用的球,公认的高尔夫球规格为重量45.93g以下,直径42.67mm以上,这是因为高尔夫球的重量增加或尺寸减小时,会增加运动量或降低受到的空气阻力。因此,根据使用者的需求,一些高尔夫球也可以减小尺寸、增加重量作为非公认的高尔夫球而被使用。
这种高尔夫球由球芯(Core)以及覆盖所述球芯的2~3层或以上的外皮层的结构组成。球芯的材料和围绕球芯的外皮层的材料是决定高尔夫球弹度、飞行距离等的主要因素。
此时,高尔夫球一般由聚丁二烯橡胶材料的高弹性球芯和聚氨酯、离聚物塑料(Ionomer Plastic)材料的外壳组成,在球芯和外壳之间还具有被称为外部球芯或内部外壳等名称的中间层。
即,球芯是决定高尔夫球飞行距离的高弹性材料,外壳作为保护层防止高尔夫球的磨损,为了根据外壳的材料改善旋转量或飞行距离,中间层可以由各种材料构成。例如,当外壳由高弹性材料制成时,可以使用增加硬度的材料作为中间层,当外壳由高硬度材料制成时,可以使用增加弹性的材料作为中间层。
但是,当中间层单纯地根据弹性或硬度使用相反的材料时,在高尔夫球的整体密度平衡或惯性矩的设计中可能产生不利的功能。
另外,现有的高尔夫球聚焦于摆动时的飞行距离或旋转量而设计高尔夫球,因此,几乎没有开发出在切球或推杆时表现出优势的高尔夫球的产品。
现有技术文献
专利文献
(专利文献)韩国专利公开公告第20010000252号(2001.01.05)
发明内容
所要解决的技术问题
根据本发明的一个方面,可以提供一种高尔夫球及其制造方法,将传递给高尔夫球的冲击能有效地转化为动能,使飞行距离的损失最小化,使推杆时滑行区间短且前旋的转换速度很快。
技术方案
根据本发明的一个方面,高尔夫球可包括:球芯,平均直径可以为37~39mm,并具有第一密度;覆盖层,可具有0.8~1.2mm的厚度以围绕所述球芯,并包含非晶质合金粉末,具有第二密度;以及外壳,具有1~1.4mm的厚度以围绕所述覆盖层,并且具有第三密度。
所述第二密度可低于所述第一密度以及所述第三密度。
所述第一密度可以为1.10~1.20g/cm3,所述第二密度可以为0.95~1.15g/cm3,所述第三密度可以为1.05~1.15g/cm3。
所述非晶质合金粉末的密度可以为6~8g/cm3。
以所述覆盖层的重量为基准,所述覆盖层中的所述非晶质合金粉末的含量为12~16wt%。
所述非晶质合金粉末的平均粒径可以为10μm~50μm。
所述球芯,所述覆盖层,所述外壳的弹性模量可依次减小。
根据本发明的另一方面,制造高尔夫球的方法可包括:球芯形成步骤,准备球芯用橡胶混合物,对球芯用橡胶混合物进行压制成型并抛光处理,制造出平均直径为37~39mm并具有第一密度的球芯;覆盖层形成步骤,在覆盖层形成用树脂中混合非晶质合金粉末以准备覆盖层用树脂混合物,将覆盖层用树脂混合物注塑成型以包围所述球芯,然后进行抛光处理,以形成厚度为0.8~1.2mm并具有第二密度的覆盖层;外壳形成步骤,在外壳形成用树脂中混合添加剂准备外壳形成用混合物,将外壳形成用树脂混合物铸造成型以包围所述覆盖层,形成厚度为1~1.4mm并具有第三密度的外壳。
所述第二密度可低于所述第一密度及所述第三密度。
所述第一密度可以为1.10~1.20g/cm3,所述第二密度可以为0.95~1.15g/cm3,所述第三密度可以为1.05~1.15g/cm3。
所述非晶质合金粉末的密度可以为6~8g/cm3,所述非晶质合金粉末的平均粒径可以为10μm~50μm,以所述覆盖层用树脂混合物的重量为基准,所述非晶质合金粉末在所述覆盖层用树脂混合物中的含量为12~16wt%。
发明效果
根据本发明的一方面,可提供一种提高飞行距离特性,并在推杆时有效提高准确性的高尔夫球及其制造方法。
本发明的技术效果不限于上述内容,也可以理解为包含有本领域技术人员从以下的说明中能够推断出效果的概念。
附图说明
图1是根据本发明一实施例的高尔夫球的局部剖视图。
具体实施方式
本发明涉及一种高尔夫球及其制造方法,在下文中,将描述本发明的优选实施例。本发明的实施例可以被修改为其他各种形式,并且本发明的范围不限于以下描述的实施例。提供本实施例是为了向本发明所属领域的技术人员进一步详细说明本发明。
在下文中,将参照附图描述根据本发明实施例的高尔夫球。
图1是根据本发明一实施例的高尔夫球的局部剖视图。
根据本发明的一个方面,高尔夫球可包含外壳10,覆盖层20以及球芯30。
球芯30可位于根据本发明的高尔夫球的内侧中心部,并且可设置为具有恒定半径的球形。即,球芯30是包含高尔夫球的中心部的最内侧的结构层,可构成为平均直径为37~39mm的球状,并由具有弹性的橡胶材料构成。
对测量平均直径的方法没有特别限制,可使用本领域技术人员常规使用的方法。举一例子,可切割高尔夫球以使高尔夫球的中心位于剖面,假设两条以上的任意直线穿过剖面上的高尔夫球的中心并进行测量以计算出球芯直径的平均值。
从确保高尔夫球的弹性力的方面,球芯的平均直径优选为37mm以上。但是,当球芯的直径过大时,高尔夫球的性能可能会因为覆盖层和外壳的厚度和密度设置的限制而下降,因此球芯的平均直径可限制在39mm以下。
此时,橡胶材料只要是作为现有高尔夫球的球芯30的使用材料则不进行特别限制并且可使用任意的材料。例如,可以使用天然橡胶、合成橡胶及其混合物,优选使用聚丁二烯橡胶,更优选使用具有40%以上的顺式键的顺式-1,4-丁二烯橡胶。
此外,当使用聚丁二烯橡胶作为橡胶材料时,可以将选自天然橡胶、聚异戊二烯橡胶、丁苯橡胶、氯丁橡胶和乙烯丙烯二烯单体(Ethylene Propylene Diene Monomer,EPDM)组合中的至少一种以上与聚丁二烯橡胶混合使用。
另一方面,当使用聚丁二烯橡胶作为橡胶材料时,聚丁二烯的密度为0.91g/cm3,因此为了调节密度,可以在橡胶材料中使用填料剂。在本发明中可以使用通常使用的填料剂。调整后的球芯的密度(第一密度)优选为1.10~1.20g/cm3。
在根据确保弹性模量增加飞行距离的方面,球芯的密度优选为1.10g/cm3以上。但是,当球芯的密度过大时,整个高尔夫球的惯性矩(MOI)变弱旋转量增加,反而可减少高尔夫球的总飞行距离。因此,优选将球芯的密度限制为1.20g/cm3以下的范围。
在球芯中通常使用的交联剂和抗氧化剂等额外的添加剂也可以非限制性地被使用。
覆盖层20形成在球芯30的外表面,并具有0.8~1.2mm的厚度。用于覆盖层20的聚合物可以使用具有高弹性的离子键(Ionomer)树脂或聚酯弹性体树脂,并且为了调整覆盖层的密度,可以添加填料剂。
例如,可以使用杜邦(Dupont)公司的沙林(SURLYN)作为高弹性的离子键(Ionomer)树脂,可以使用可隆塑胶(KOLON PLASTIC)的科佩(KOPEL)作为聚酯弹性体树脂。在本发明中,为了便于调整覆盖层20的密度,可以使用离子键(Ionomer)树脂或聚酯弹性体树脂。离子键树脂的密度可以为1.0g/cm3以下,聚酯弹性体的密度可以为1.15g/cm3以上。
在覆盖层的聚合物中混合形成非晶质合金粉末,通过混合非晶质合金粉末覆盖层的弹性模量增大从而将冲击能转化为动能的能力增大。
此时,非晶质合金粉末以6~8g/cm3密度,12~16wt%包含在覆盖层中,平均粒径为10μm~50μm。更优选地可以为20~30μm。从确保覆盖层的弹性模量的方面,非晶质合金粉末的密度优选为6g/cm3以上,优选地,基于整个覆盖层的重量非晶质合金粉末以12wt%以上的范围包含在覆盖层中。但是,非晶质合金粉末的密度过高或非晶质合金粉末与覆盖层被过多的添加时,覆盖层的弹性模量变得高于球芯的弹性模量从而抵消飞行距离的增大效果,或者在制造覆盖层时,非晶质合金粉末可能不会均匀地分散在聚合物中。因此,非晶质合金粉末的密度优选为8g/cm3以下,优选地,基于整个覆盖层的重量,非晶质合金粉末以16wt%以下的范围包含在覆盖层中。
在非晶质合金粉末的均匀分散方面,非晶质合金粉末的平均粒径越小越有利。但是,非晶质合金粉末的平均粒径过小时,与非晶质合金粉末的添加量相比,弹性模量的增大效果并不显著,因此非晶质合金粉末优选具有10mm以上的平均粒径。另一方面,当非晶质合金粉末的平均粒径过大时,可表现出由于非晶质合金粉末的不均匀分散的不规则弹性,随之,可能会劣化高尔夫球的整体性能。因此,可以将非晶质合金粉末的平均粒径限制在50μm以下的范围。
在本发明中,对非晶质合金粉末的组成没有特别限制,但可以优选使用含有铁的铁基非晶质合金粉末。
非晶质合金粉末的成分为非限制性的,但优选包括增加强度的铁、具有耐腐蚀性的铬或钼,优选包括增强非晶质形成性能的碳、硼等。例如,基于100重量份的铁,可以使用包含有25.4~55.3重量份的铬以及35.6~84.2重量份的钼的粉末。
覆盖层的密度(第二密度)优选为0.95~1.15g/cm3,覆盖层的厚度优选为0.8~1.2mm。其中,覆盖层的厚度可以是指在高尔夫球的剖面中的多个点处测量的覆盖层的厚度的平均值。由于覆盖层的密度低于球芯或外壳,因此整体上起到平衡整体密度的功能。在根据确保弹性模量的飞行距离增大方面,覆盖层的密度优选为0.95g/cm3以上,覆盖层的厚度优选为1.2mm以下。另一方面,根据本发明的发明人的研究结果可以确认,含有非晶质合金粉末的覆盖层的密度低且覆盖层的厚度越厚,推杆时发生的高尔夫球的滑行区间的长度体现出变短的倾向。即,本发明将覆盖层的密度限制在1.15g/cm3以下的范围,将覆盖层的厚度限制在0.8mm以上的范围,因此在推杆时,可有效确保高尔夫球沿设定方向滚动的滚动特性。
因此,为了调整覆盖层20的密度可以另外使用填料剂,但是在某些情况下,上述非晶质合金粉末也可以起到填料的作用。
可在覆盖层20的外表面上设置具有1mm~1.4mm厚度的外壳10。外壳的厚度也可以是指在高尔夫球的剖面中的多个点处测量的外壳的厚度的平均值。可以在外壳10的表面上形成凹洞(Dimple)。
根据所要制造的球的硬度特性,外壳可以使用离聚物或聚氨酯树脂,并且可以包括填料剂和颜料。
外壳的密度(第三密度)可以是1.05~1.15g/cm3。优选地,在确保耐久性和弹性模量的方面,外壳的密度为1.05g/cm3。另一方面,当外壳的密度过大时,球芯的弹力被抵消反而使高尔夫球的飞行距离变短,因此外壳的密度优选为1.15g/cm3以下。此外,为了最优化高尔夫球的弹性模量、旋转量和滑行区间,外壳的第三密度优选为等于或低于球芯的第一密度,并且,外壳的第三密度优选为高于覆盖层的第二密度。此外,为了最优化高尔夫球的弹性模量、旋转量和滑行区间,外壳的弹性模量优选为低于球芯和覆盖层的弹性模量。
在确保耐久性和弹性模量的方面,外壳的厚度优选为1mm以上。另一方面,当外壳的厚度过厚时,高尔夫球中的覆盖层和球芯的比例降低,反而不仅无法确保所需的弹性模量,而且发生滑行区间增加的现象,因此外壳的厚度优选为1.4mm以下的范围。
根据本发明另一方面,高尔夫球的制造方法包括球芯形成步骤、覆盖层形成步骤和外壳形成步骤。
球芯形成步骤是,将丁二烯、填料剂和抗氧化剂的添加剂进行混合并在捏合机和辊磨机中均匀地混合以准备球芯用橡胶混合物,并且对球芯用橡胶混合物进行压制成型并抛光处理,制造出高尔夫球的球芯的步骤。通过压制成型和抛光处理提供的球芯可以满足1.10~1.20g/cm3的密度(第一密度)以及37~39mm的平均直径。
覆盖层形成步骤是,在作为覆盖层形成用树脂的离聚物树脂或聚酯弹性体树脂混合非晶质合金粉末并准备覆盖层用树脂混合物,将覆盖层用树脂混合物注塑成型以包围球芯,然后对其进行抛光处理形成覆盖层。在覆盖层形成步骤中使用的非晶质合金粉末可以是具有上述颗粒大小和物理性质的非晶质合金粉末。注塑成型和抛光处理后的覆盖层可以满足0.95~1.15g/cm3的密度(第二密度)以及0.8~1.2mm的厚度。
外壳形成步骤是,在作为外壳形成用树脂的离聚物树脂或聚氨酯树脂混合添加剂从而准备外壳形成用混合物,将外壳形成用树脂混合物铸造或注塑成型以围绕覆盖层。
之后,将外壳的褶皱部分修整并进行表面处理以形成涂层,然后通过印刷机对其进行标记并进行质量检查即可制造出高尔夫球。在最终制造的高尔夫球中,外壳的密度(第三密度)可以满足1.05~1.15g/cm3的范围,外壳的厚度可以满足1~1.4mm的范围。
附图标记:
10:外壳
20:覆盖层
30:球芯
实施方式
在下文中,通过实施例更具体地说明本发明的高尔夫球。下文中的实施例是为了更详细地说明本发明而被提供,并且应注意本发明的范围不限定于以下实施例所记载的事项。
[实施例]
在捏合机和辊磨机中均匀地混合聚丁二烯橡胶、填料剂和抗氧化剂(Antioxidant)制备球芯用橡胶混合物后,将球芯用橡胶混合物压制成型并研磨制造具有表1所示的直径和密度的高尔夫球球芯。通过调整填料剂的添加量来控制球芯的密度。
接着,添加离聚物树脂、填料剂、非晶质合金粉末以制备覆盖层用树脂组合物,然后注塑成型并抛光覆盖层用树脂组合物形成具有表1所示厚度的覆盖层。非晶质合金粉末以100重量份的铁为基准,含有25.4~55.3重量份的铬和35.6~84.2重量份的钼,利用了含有其他微量的硼或碳的非晶质合金粉末,并将非晶质合金粉末的平均粒径控制在约30μm,然后将其添加到树脂组合物中。No.10的情况,使用密度为5g/cm3的非晶质合金粉末略微降低了覆盖层的密度,No.11的情况,通过使用密度为9g/cm3的非晶质合金粉末略微提高了覆盖层的密度。剩余的高尔夫球使用密度为7g/cm3的非晶质合金粉末制造了覆盖层。将非晶质合金粉末添加到覆盖层用树脂组合物中以满足基于覆盖层用树脂组合物重量分的14wt%的重量。
接着,使用离聚物和添加剂制备外壳用树脂混合物。铸造成型和抛光处理外壳用树脂混合物以便包围包括球芯的覆盖层的外表面,从而形成具有表1中所示的厚度和密度的外壳。通过调整填料量的添加量来控制外壳的密度。
【表1】
使用与R&A以及USG中使用的Golf Laboratories公司的产品相同的摆动机器人,实施了按照表1的条件提供的高尔夫球的挥杆飞行距离测试(模拟杆头速度100MPH),测量每个高尔夫球的球速(Ball Speed,MPH)、发射角度(Launch Angle)、总旋转量(TotalSpin,RPM)、飞行距离(Carry,m)以及总距离(Total,m)并将其结果记载到表2。
另外,使用推杆摆动机器人对按表1的条件提供的高尔夫球的推杆击球试验(模拟推杆速度3MPH)进行了追加测试,测量从每个高尔夫球的击球点到经过后旋(back spin)区间转换为前旋(forward spin)的地点的滑行距离(Skid,m),并一同记载在表2中。
【表2】
根据表1和表2可以确认,满足本发明所限定的球芯、覆盖层和外壳的厚度和密度的发明实施例加速了作为决定高尔夫球飞行距离的主要因素的球速并减少了旋转量,从而综合来说同时满足了240m以上的总距离以及0.7m以下的滑行距离,反之,不满足本发明所限定的球芯、覆盖层和外壳的厚度和密度中的任一项的比较例无法满足240m以上的总距离以及0.7m以下的滑行距离。
因此,根据本发明的一个方面,可以提供一种高尔夫球及其制造方法,其提高飞行距离特性的同时可以有效地提高推杆时的准确性。
尽管已经通过以上实施例详细描述了本发明,但是其他类型的实施例也是可形的。因此,以下记载的权利要求的技术思想及范围不限定于实施例。
Claims (11)
1.一种高尔夫球,其特征在于,包括:
球芯,平均直径为37~39mm,并具有第一密度;
覆盖层,具有0.8~1.2mm的厚度以围绕所述球芯,并包含非晶质合金粉末,具有第二密度;以及
外壳,具有1~1.4mm的厚度以围绕所述覆盖层,并且具有第三密度。
2.根据权利要求1所述的高尔夫球,其中,
所述第二密度低于所述第一密度以及所述第三密度。
3.根据权利要求1所述的高尔夫球,其中,
所述第一密度为1.10~1.20g/cm3,所述第二密度为0.95~1.15g/cm3,所述第三密度为1.05~1.15g/cm3。
4.根据权利要求1所述的高尔夫球,其中,
所述非晶质合金粉末的密度为6~8g/cm3。
5.根据权利要求4所述的高尔夫球,其中,
以所述覆盖层的重量为基准,所述非晶质合金粉末在所述覆盖层中的含量为12~16wt%。
6.根据权利要求1所述的高尔夫球,其中,
所述非晶质合金粉末的平均粒径为10μm~50μm。
7.根据权利要求1所述的高尔夫球,其中,
所述球芯、所述覆盖层、所述外壳的弹性模量依次减小。
8.一种高尔夫球的制造方法,包括:
球芯形成步骤,准备球芯用橡胶混合物,并对球芯用橡胶混合物进行压制成型并抛光处理,制造出平均直径为37~39mm并具有第一密度的球芯;
覆盖层形成步骤,在覆盖层形成用树脂中混合非晶质合金粉末以准备覆盖层用树脂混合物,将覆盖层用树脂混合物注射成型以包围所述球芯,然后进行抛光处理以形成厚度为0.8~1.2mm并具有第二密度的覆盖层;以及
外壳形成步骤,在外壳形成用树脂中混合添加剂以准备外壳形成用混合物,将外壳形成用树脂混合物铸造成型以包围所述覆盖层,形成厚度为1~1.4mm并具有第三密度的外壳。
9.根据权利要求8所述的高尔夫球的制造方法,其中,
所述第二密度低于所述第一密度及所述第三密度。
10.根据权利要求8所述的高尔夫球的制造方法,其中,
所述第一密度为1.10~1.20g/cm3,所述第二密度为0.95~1.15g/cm3,所述第三密度为1.05~1.15g/cm3。
11.根据权利要求8所述的高尔夫球的制造方法,其中,
所述非晶质合金粉末的密度为6~8g/cm3,
所述非晶质合金粉末的平均粒径为10μm~50μm,
以所述覆盖层用树脂混合物的重量为基准,所述非晶质合金粉末在所述覆盖层用树脂混合物中的含量为12~16wt%。
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