出版物: 2024 年 2 月 19 日 最近更新時間: 2025 年 3 月 11 日

引入的光学测量设备根据DIN EN ISO 294-4标准提供了相应的收缩值


 


在塑料工业的加工过程中,光学测量设备的收缩值细节是标准信息的一部分,因为这是模具构造的重要规范。为了向制造商提供最精确的数据,凯柏胶宝® 自2023年8月以来一直在使用一种非接触式光学测量设备,该设备能够进行距离测量,以确保符合DIN EN ISO 294-4标准的收缩值。

 

瓦尔德克赖博格,2024年2月2日 - “用于确定热塑性塑料的加工收缩和后收缩”的测量是基于符合DIN标准的60 x 60 x 2毫米大小的试样进行注塑的,同时相应的数值也由此确定。收缩值在测量过程中沿着流向方向和横向方向确定。


结合其他参数,如壁厚和流道路径,这些规格使模具制造商和计算工程师能够进行具体的计算,以最准确地设计其模具尺寸。这适用于制造新模具和调整现有模具,例如计划中的材料更改。在所有情况下,腔体必须设计得足够合理,以便考虑材料在加工后持续达48小时的收缩,与塑料零件成品的关系要纳入考虑。


凯柏胶宝® 应用工程团队的格里特·穆勒总结:“我们之前通过使用触觉测量设备来确定收缩值”。“使用非接触测量设备,特别是对于软性和极软性材料的收缩测量,已被证明是有利的。”她补充说,原因在于“在使用机械设备时,由于最小的压缩载荷可能导致测量失真,从而导致在加工后最终塑料所需尺寸的最小偏差。” 根据格里特·穆勒的说法,使用新的光学测量设备所需的条件已经在去年确定,即通过将另一个插入件整合到新的主模具中(包括内部压力传感器)。

自引入新的非接触测量设备以来,凯柏胶宝® 已能够根据DIN EN ISO 294-4标准确定所有已建立的化合物的收缩值,而不论所测试材料的邵氏硬度如何,这使得无论是现有客户还是潜在的新客户都能够基于更精确的信息对使用新材料或替代材料做出决策。这对于生产单组分材料尤为重要,因为在这些情况下,只有TPE源材料会发生收缩,但这也使得更好地评估两组分复合材料中收缩的影响。
 


Shrinkage values in accordance with DIN EN ISO 294-4


Shrinkage can be measured for any Shore hardness.

During the industrial processing of plastics, details of their shrinkage values form part of the standard information that is essential as a specification for mold construction. To provide manufacturers with maximally precise data, KRAIBURG TPE has been using a contactless optical measuring device since August 2023, which enables distance measurements required to determine shrinkage values in accordance with DIN EN ISO 294-4.

Waldkraiburg, February 2, 2024 – The measurements “for determining the processing shrinkage and the post-shrinkage of thermoplastics” are based on test specimens 60 x 60 x 2 mm in size that are injection-molded in accordance with the DIN standard, for which the values are determined. During measurements, shrinkages are determined both along the direction of flow and transverse to it.

Combined with other parameters such as wall thicknesses and flow paths, these specifications enable mold makers and calculation engineers to carry out specific calculations for the most accurate dimensioning of their molds. This applies to the manufacture of new molds, but also to adjusting existing molds, e.g. for planned material changes. In all cases, the cavity must be designed in such a way that the material shrinkage, that persists for up to 48 hours after processing, is taken into account in relation to the finished plastic part.

“We previously determined the shrinkage values by using tactile measuring devices,” summarizes Grit Müller of Team Application Engineering at KRAIBURG TPE. “The use of contactless measuring devices has proved to be advantageous, particularly for measuring the shrinkage of soft and very soft materials.” The reason for this, she adds, is that “When using mechanical devices, measurement distortions may occur due to minimal compressive loading, which in turn leads to minimal deviations from the dimensions required for the finished plastic after processing.” According to Grit Müller, the conditions required for using the new optical measuring device – i.e. expanding the in-house test plate production by integrating another insert into the new master die (including internal pressure sensors) – were already established last year.

Since the introduction of the new contactless measuring device, KRAIBURG TPE has been able to determine shrinkage values for all established compounds in accordance with the DIN EN ISO 294-4 standard, irrespective of the Shore hardness of the tested materials. This enables both existing customers and also potential new customers to make decisions on the use of new or alternative materials based on even more precise information. This is of particular relevance for the production of single-component materials, since in these cases it is only the TPE source material that shrinks. But it also makes it possible to better assess the impact on shrinkage in two-component composites.

凯柏胶宝® - 快览
 

  • 总部和生产基地:瓦尔德克赖堡/德国
  • 区域总部和生产基地:吉隆坡/马来西亚,亚特兰大/美国
  • 产品:热塑性弹性体化合物
  • 品牌:热塑宝、科柔宝®、高温宝和尼塑宝®
  • 市场:欧洲、美洲、亚太地区
  • 员工:660

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