CN104684703B - 在两种不同塑料之间具有接触部的模制塑料制品 - Google Patents

在两种不同塑料之间具有接触部的模制塑料制品 Download PDF

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CN104684703B
CN104684703B CN201380051251.6A CN201380051251A CN104684703B CN 104684703 B CN104684703 B CN 104684703B CN 201380051251 A CN201380051251 A CN 201380051251A CN 104684703 B CN104684703 B CN 104684703B
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powder
plastics
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contact surface
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加里·韦恩·弗格森
约翰·彼得·瑟尔
基思·怀恩斯
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
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    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/70—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/727—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being porous, e.g. foam
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    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
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    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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  • Organic Chemistry (AREA)
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Abstract

提供一种塑料模制工艺，其中第一塑料部分(2)和第二塑料部分(3)被模制，使得在这两个部分之间形成接触面。第一部分(2)被首先模制，并且在至少所述接触面仍处于液态或塑性状态时，将与第一部分(2)的塑料相容且具有附接到第一部分(2)的塑料的特性的促附接粉末(16)施加到接触面。此后，第二部分(3)被模制以便在接触面处接触第一部分，使得在其凝固时附接到促附接粉末(16)并由此附接到第一部分(2)。第二部分(3)可以是用于中空的第一部分(2)的泡沫塑料填料。促附接粉末(16)可以是合适等级的硅藻土或者天然的或合成的等效物。

Description

在两种不同塑料之间具有接触部的模制塑料制品
技术领域
本发明涉及模制塑料制品，其中一种类型的塑料材料具有与不同塑料材料的表面接触的表面，诸如，例如在热塑性材料和热固性塑料材料的实例中。
更具体地，但不排外地，本发明涉及热塑性材料与热固性塑料材料在整个接触面区域上的附接，热塑性材料典型地是坚固的耐磨材料，诸如聚乙烯或者聚丙烯，而热固性塑料材料提供典型地选自轻质、刚性、绝热、填充空隙和附接的其它所需性能。后者典型地是泡沫塑料材料，诸如泡沫聚氨基甲酸酯。
本发明特别地但不排外地涉及旋转模制的热塑性容器，其具有空腔壁，其中空腔被填充有热固性泡沫塑料绝热材料。
背景技术
热塑性材料通常的是聚烯烃，诸如聚乙烯和聚丙烯，并且在特定温度以上变得可塑或者可模制，并且在冷却时恢复到固态。它们能够通过经受多次加热和通过挤压、注射模制、吹塑和旋转模制法的再成形，这使得它们是可再循环利用的。
聚乙烯和聚丙烯具有许多期望的特性，包括韧性、挠性和常温下对于大多数化学制品和溶剂不活泼中的那些特性。它们通常是电的不良导体。
另一方面，热固性塑料是下述聚合物材料：其通过形成不可逆的化学键固化，其中使用热、化学反应或者辐射来促进固化。热固性材料被模制为它们的最终形态，或者用作粘合剂。许多热固性塑料在它们固化时被泡沫化，诸如熟知的聚氨基甲酸酯泡沫材料。
在用泡沫塑料绝热材料填充坚固耐冲击且耐磨的塑料壳体的应用中，诸如在冷箱或用于冷藏或冷冻商品的送货容器的情况下，塑料壳体的最成本有效的物理特性典型地由聚烯烃塑料提供，该聚烯烃塑料可以是多种不同等级的聚乙烯和聚丙烯中的任一种。壳体典型地通过旋转模制制成。旋转模制工艺良好地适用于双壁容器、特别是深容器的制造，诸如绝热冷箱和送货容器。这种旋转模制工艺典型地包括四个阶段，即用热塑性粉末装填模具；加热和熔化粉末，同时绕两个轴线旋转模具；在持续旋转期间冷却模具；以及脱模。
聚烯烃塑料，并且特别是包括那些被称为线型低密度聚乙烯(LLDPE)、低密度聚乙烯(LDPE)、中密度聚乙烯(MDPE)和高密度聚乙烯(HDPE)的那些材料的聚乙烯组据称在用于旋转模制部分的市场中占据优势，其中据称LLDPE以明显的优势最为普及。
虽然聚烯烃塑料一般地具有良好的耐冲击和耐化学性，LLDPE的强度和刚度特性已知为特别依赖温度。结果，并且特别是关联于高的膨胀系数，LLDPE旋转模制品会在暴露于强烈阳光或其它热源时表现出一些变形或者肿胀。LLDPE固有地是柔性的，并且具有受限的刚度，这使得模具设计者使用诸如缺口、加肋、角和褶皱的特征的排列来增加模制品的刚性和强度。
用泡沫塑料填充中空双壁容器是成本有效的增加旋转模制制品的刚度、强度和刚性的方法。泡沫芯部提供了形状固位以及优异绝热和浮力的额外益处。聚氨基甲酸酯泡沫体通常是用于脱模后应用的泡沫型选择。其是低密度、刚性、绝热的泡沫，具有优异的热性能并且具有低的热膨胀系数。聚氨基甲酸酯泡沫可以以各种不同方式施加到要填充的空腔中，包括使用测量且混合好的二元(two-part)液体形式，该二元液体形式膨胀为一团气泡且快速固化。
遗憾地，LLDPE作为外表层的理想性能和聚氨基甲酸酯泡沫作为通用的、广泛应用的绝热填充物的理想性能在使得其中一个以足够的程度附接到另一个方面导致困难。该现象归因于这样的事实：聚氨基甲酸酯泡沫往往在其蜂窝状芯部结构和LLDPE基底之间的界面处形成光滑表层，如该泡沫直接在以脱模剂处理的模具中固化时那样。
与不足附接关联的一个问题在于，外表层或壳体可独立于泡沫芯部移动，并且由于它们的不同的热膨胀系数，壳体的膨胀可能独立于泡沫发生。从结构观点来讲，没有办法能够将剪力从壳体可靠地传递到泡沫，如在隔声夹层结构复合材料中所期望的那样。
虽然聚氨基甲酸酯泡沫作为普及的热固性填充材料相对于宽范围的基底和其它塑料材料可具有大体上高水平的附接，但它与LLDPE不兼容并且其与该热塑性塑料的结合非常弱。聚乙烯与其它材料诸如颜料、油漆或其它聚合物的不良附接和不兼容使得它被归类为“难结合材料”。
塑料工业中的惯例是对难以结合的材料进行表面改性(处理或预加工)操作，以增强它们的附接可能性。目前的表面改性方法包括热、化学、打底和物理处理。所有这些被设计成增大塑料表面的反应性和粗糙度。但是，通过这些脱模后的二次操作来制备旋转模制制品的内表面用于聚氨基甲酸酯泡沫在相关额外成本、适应性、实际执行、便利性和安全性方面引起挑战。
在要改性的表面能被合适地接近的情况下，表面改性法包括：使用氟气以短暂暴露的氟化法，其缺陷在于氟气是高毒性和腐蚀性的，并且如果吸入则是致命的；电晕放电和等离子处理，其伴随着固定设备或处理外包上的大的投资；火焰处理，其通常用于聚烯烃片材或较小的简单形状的物品；打底，其中活性粒子被溶解且用刷子或者喷头施加到表面；化学蚀刻，诸如铬酸蚀刻，其可是危险并且导致其使用受限；以及可伴随有磨蚀的表面粗糙化，伴随着灰尘和健康危害的喷砂处理和蚀刻。
各种其它的表面改性方法更适合于封闭表面，诸如旋转模制件的内表面，并且可以涉及用粉末等级的组合来装填模具以促进热塑性塑料壳体形成氧化的内部表层，以便促进与典型地为聚氨基甲酸酯泡沫的热固性塑料的填充物的附接。然而，可能存在产生具有受损的外表层或弱化结构的模制件的可能性。
还可以将其它诸如钢、铝、花生壳或者其它异物之类的非聚合物细粒的颗粒与聚合物装料一起添加到转动模制周期。颗粒被嵌入LDPE基底中，并且从其中突出以呈现用于附接到泡沫塑料的带键表面。该方法的缺点在于：颗粒可能突出通过商品表面且损害商品表面，并且嵌入的异物颗粒可以削弱LLDPE表层，特别是在存在有异物集中的场合。
另一技术是在未达到完全地熔融模具中的LLDPE粉末装料时停止模制过程，从而粉末在内表面处不会完全熔融，该内表面保持粗糙且提供良好的机械抓持用于改进的聚氨基甲酸酯泡沫附接。该技术是难以控制的，因为旋转模制受到诸多因素的影响，包括周围温度。过于“欠火候”产品将具有受损的强度，并且可能被拒绝。优异的“欠火候”产品可能要求过大的装料尺寸，且因此产品的成本和重量会超出所需。
更新的技术是用等离子处理后的粉末和小粒装填模具，以模制出具有附接增强内表面的物品。需要进行等离子体处理的该技术受到若干独占知识产权所有人和设备制造商的限制。
需要提供一种将不同塑料材料彼此结合的增强方法，诸如将热塑性塑料结合到热固性塑料的情况。另外需要提供一种旋转模制方法，借以两种不同塑料的促附接剂可在模制周期的特定阶段被引入到模制物品中。
发明内容
根据本发明，提供一种塑料模制工艺，其中第一部分被模制以及第二部分被模制，使得所述第二部分的表面的至少一部分在模制工艺过程中接触所述第一部分的表面，相接触的表面形成两个部分之间的接触面，其中所述第一部分被首先模制，并且在至少所述接触面仍处于液态或塑性状态时，将具有与热塑性的所述第一部分附接的特性的促附接粉末施加到所述接触面的至少一部分以在所述第一部分的接触面上形成所述促附接粉末的连续或不连续层，并且此后模制所述第二部分以便在所述接触面处接触所述第一部分，使得所述第二部分的塑料在凝固之前或在凝固时附接到所述促附接粉末，并由此借助在所述第一部分的塑料和所述第二部分的塑料之间的整个所述接触面上形成连续或者不连续的中间层的所述促附接粉末附接到所述第一部分。
本发明的另外特征提供为：所述第一部分是热塑性材料，所述第二部分是热固性塑料材料，并且所述促附接粉末形成连续或者不连续的中间层；所述第一部分通过旋转模制工艺制成，并且当所述第一部分已被大体上形成时，所述促附接粉末被释放到所述第一部分的内部使得所述促附接粉末大体上分布在所述第一部分的整个接触面上，同时内表面为充分液态或塑性的以便附接到所述促附接粉末；所述第二部分是用于中空的第一部分的泡沫塑料填料；所述第一部分由热塑性聚烯烃制成，尤其是由聚乙烯制成，并且最特别地由线性或者其它低密度聚乙烯制成；所述泡沫填料是热固性聚氨基甲酸酯；并且所述促附接粉末是合适等级的硅藻土或者天然或合成的等效物。
虽然硅藻土附接到两种不同塑料的机制并未被完全理解，但认为这可能是由于硅藻土能够吸收或者吸收在发生凝固之前处于液态熔融物状态的聚烯烃以及在发生凝固之前仍为流体且膨胀的聚氨基甲酸酯泡沫两者的事实。基本原理在于，已知具有锋利性、独特颗粒结构和粒状互锁特性的品质的硅藻土颗粒促进与熔融热塑性塑料表面的附接，由此提供了良好的润湿特性。已经进一步注意到，硅藻土粉末的惰性并未表现出影响到任一塑料类型的固化和硬化。
硅藻土粉末的轻质性使得它在模制件内充气且形成尘云，由此有助于均匀分布在复杂形状的模制件的表面上。另外，形成促附接粉末中间层的硅藻土粉末不易于随着时以及当受到合理应力水平时破裂。
然而，现阶段并不了解是否有其它粉末会表现出同样的特性，或者是否合成等效物可变得可用。
为了可更充分地理解本发明，现在将参照附图描述本发明的一个实施例。
附图说明
在附图中：
图1是示出准备用于模制的部分地组装的两个半模的示意性截面图；
图2是所组装的模具在安装在旋转模制设备上时的示意性截面图；
图3是被拆开的模具和从该模具脱模的模制产品的示意性截面图；
图4是更详细地示出所完成模制的产品且其一部分被移除的示意性等轴测图；和
图5是穿过所完成的模制产品的双壁截取的以非常大的程度放大的截面图，示出其最终形成的层。
具体实施方式
在本发明的该特定实施例中，模制的塑料产品为双壁绝热送货容器(1)的形式，其具有借助于环绕的槽边(reveal)(4)互连的大体槽形的外壳体(2)和稍小的对应成形的内壳体(3)(见图4)。双壁容器由合适等级的热塑性塑料聚乙烯材料制成，并且在该特定实例中；其由线性低密度聚乙烯(LLDPE)制成。壁之间的空间被填充有热固性绝热泡沫聚氨基甲酸酯材料(5)。
该产品通过旋转模制工艺制成，其中双壁容器形成第一塑料部分，该第一塑料部分首先用外部半模(11)和内部半模(12)模制，在模具组装之前将合适的粉末状或者粒状塑料(13)装料装入外部半模。如在图2中最佳示出的，容器以通常的方式被模制。
一旦模制周期结束，预定量的硅藻土形式的促附接粉末被引入到模具中，在该实例中，使用任何便利的方法诸如金属喷枪(15)和压缩空气通过通风管(14)将其引入模具中。以此方式，形成促附接粉末的连续或者不连续层(16)(见图5)。
这优选地发生在模制周期中全部粉末熔融的阶段，此时容器内的模制塑料的内表面处于液态或塑性状态使得硅藻土能够部分地吸收或者吸收塑料材料且由此变得附接到塑料。熔融的热塑性基底提供了能附接粉末的合适粘性表面，并且当塑料冷却时不会损伤附接。可采用任何合适的手段来确保硅藻土变得大致分布在容器外壳体的整个内表面上，同时内表面为充分液态或塑性以结合到粉末。粉末的分布可在模具的双轴向旋转期间完成。
通常认为，趋于存在于热塑性模制件的熔融内表面上的静电荷有助于分布和附接，其中电荷吸引粉末颗粒。这些静电荷可通过非导电聚合物粉末或者粒状颗粒之间在加工和混合期间的摩擦产生。这些塑料趋于将静电荷保持延长时间至下述程度：通常采用措施来中和塑料制品上的表面静电荷，由此削弱它们吸引灰尘和空气污染物的倾向。
预定量的合适聚氨基甲酸酯的双组分预混料被用于形成第二塑料部分，该第二塑料部分是形成第一塑料部分的双壁容器内的泡沫热固性树脂的芯部，以便产生绝热泡沫来填充容器的内壳体和外壳体之间的整个空腔。执行该步骤以便聚氨基甲酸酯泡沫接触模制容器的内表面，这些表面由此形成上述的两个部分之间的接触面。
所用硅藻土的量能够在宽范围内变化，但实验表明，近似60ml的硅藻土对于要覆盖的每平方米表面将是足够的。已经指出，硅藻土粉末的量优选地足以使热塑料表面变得无光泽以便是有效的，并且熔融的塑料过于粘性而不会通过毛细作用被吸入硅藻土层中。
在迄今已经进行的实验中，所用的聚氨基甲酸酯泡沫由南非开普敦的AEROTHANEAPPLICATIONS(PTY)LTD提供。其是标准的二元发泡系统(two part foaming system)，提供大约35kg/m3的目标芯部密度；大约200kPa的抗压强度；至少95％的闭孔含量；和小于2.5％的体积吸水率。泡沫使用水起泡剂以产生二氧化碳(CO2)。反应分布被要求为：乳白时间60-70秒；发起时间(rise time)240-300秒；以及不粘时间270-300秒。
在发泡过程被加压的场合，泡沫一般地在整个接触面上形成接触促附接粉末层的实心层或表层。已经指出，即使在未加压发泡过程中，气泡也有力地粘附于促附接粉末。
实验表明，在塑料基底上的任何合理过量的硅藻土明显被聚氨基甲酸酯泡沫吸收，并且一般地，附接将不会受到损害。
许多已有的二元热固性聚氨基甲酸酯泡沫使用水作为发泡剂。接触面包括硅藻土颗粒的暴露表面，并且聚氨基甲酸酯塑料在聚氨基甲酸酯泡沫形成时接触颗粒。通常认为，一些聚氨基甲酸酯可以变得被至少部分地吸收或者吸附到硅藻土颗粒中或上，以便其附接到该颗粒。硅藻土由此呈现出结合到作为容器的内壳体和外壳体的第一部分的聚乙烯塑料内表面的特性，并且当泡沫聚氨基甲酸酯芯部形式的第二部分被模制到壳体中时，硅藻土结合到第二部分的塑料。硅藻土颗粒由此表现为形成与两种塑料的机械附接，以将它们牢固地附接到一起。
迄今已进行的测试中使用的硅藻土是由美国宾夕法尼亚州的Dicalite,DICAPERLMINERALS,INC销售的Dicalite 4500。其被描述为一种白色、助熔煅烧硅藻土，主要用作助滤剂并且具有所要求的370kg/m3的松密度；64的中值粒子密度(MDP um)；以及小于0.5％的湿气接触。
如上所述，硅藻土附接到两种不同塑料的机制并未被完全理解，但认为是由于硅藻土具有高吸收能力并且能够吸收或者至少吸收聚烯烃和聚氨基甲酸酯二者的事实造成的，在每种情况下，在塑料具有充分流动性的情况下具有该特性。但是，看起来是由于促附接硅藻土中间层的颗粒的高孔隙度、高表面积和复杂表面构形促成的机械键合和互锁的结果。
可采用将硅藻土粉末引入封闭的旋转模制产品内的其它方法对于本领域技术人员将相当明显的。使用由新西兰公司LA PLASTECNICA生产的已知为“SUPAVENT”的限压阀可是有利的。
在初始模制已经进行之后，使用任何其它技术将粉末引入到旋转模制制品的内部中也是可能的，例如使用所谓的滴盒(drop-box)并且可选地使用具有在预定温度下熔融的膜的滴盒，或者使用保持装料的可熔塑料袋，或者使用在外壳体的起始模制完成并且内表面上的塑料仍处于合适液态或塑性状态时能够将粉末在合适的时间内充分地释放到模具内的其它方法。
将理解，本发明可应用于任何形状的旋转模制制品，并且决不局限于上述类型中的旋转模制制品。
更进一步，本发明可应用于其它的塑料制品，其中施加热以转变热塑性塑料颗粒和粉末以通过包括但不局限于板材的吹塑和挤压的其它方法形成其它的这类制品。
设想到，本发明可特别地应用于在通常情况下可能不趋于彼此粘附的两种不同塑料的共挤压或二次挤压，并且在该实例中，基本原理在于在挤压过程期间可以将连续或者不连续的促附接粉末层引入到两种共挤压或二次挤压层之间。通常产生共挤压以提供用于多种不同产品的吹塑的管状起始材料,该多种不同产品包括但不限于容器和罐，诸如太阳能热水器罐和其它贮水罐。
再进一步，本发明可应用于其它类型的热固性塑料，并且决不局限于上述填充物中的泡沫聚氨基甲酸酯填充物类型。
因此，可对本发明的上述实施例做出许多变化，而不偏离本发明的范围。

Claims (8)

1.一种塑料模制工艺，其中第一部分被模制以及第二部分被模制，使得所述第二部分的表面的至少一部分在模制工艺过程中接触所述第一部分的表面，并且相接触的表面形成两个部分之间的接触面，其中所述第一部分被首先模制，并且在至少所述接触面仍处于液态或塑性状态时，将具有与所述第一部分的塑料附接的特性且为合适等级的硅藻土的促附接粉末施加到所述接触面的至少一部分以在所述第一部分的接触面上形成所述促附接粉末的连续或不连续层，并且此后模制所述第二部分以便在所述接触面处接触所述第一部分，使得所述第二部分的塑料在凝固之前或在凝固时附接到所述促附接粉末的连续或不连续层，并由此借助在所述第一部分的塑料和所述第二部分的塑料之间的整个所述接触面上形成连续或者不连续的中间层的所述促附接粉末附接到所述第一部分。
2.如权利要求1所述的塑料模制工艺，其中所述第一部分由热塑性材料制成，所述第二部分由热固性塑料制成。
3.如权利要求1所述的塑料模制工艺，其中所述第一部分是中空的并且通过旋转模制工艺制成，并且当所述第一部分已被大体上形成时，所述促附接粉末被释放到所述第一部分的内部使得所述促附接粉末变得大体上分布在所述第一部分的整个接触面上，同时所述第一部分的内表面为充分液态或塑性的以便附接到所述促附接粉末。
4.如权利要求1所述的塑料模制工艺，其中所述第二部分是用于填充中空的第一部分的泡沫塑料。
5.如权利要求4所述的塑料模制工艺，其中所述第一部分由热塑性聚烯烃制成，并且所述泡沫塑料是热固性聚氨基甲酸酯。
6.如权利要求3所述的塑料模制工艺，其中使用引入到通风管内的喷枪将所述促附接粉末引入到中空的所述第一部分内，并且使用压缩空气将所述粉末吹送到中空的所述第一部分内。
7.如权利要求3所述的塑料模制工艺，其中使用滴盒将所述促附接粉末释放到中空的所述第一部分的内部。
8.如权利要求3所述的塑料模制工艺，其中使用在与所述第一部分的内表面的液态或塑性状态的获得相应的预定温度下熔融的袋子将所述促附接粉末释放到中空的所述第一部分的内部。
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