查尔斯·h·Trillich /创始人Packworld美国

热封技术发展了几十年降低成本和增加利润与精密热封。这篇文章反映了这些进步和如何获得完美的海豹每次。

近年来切割的方法和手段和/或密封塑料薄膜和加入塑料组件从一个艺术先进科学的开发和引入过程控制,几乎每次都保证完美的结合。这种能力的发展,推动了对塑料包装材料在关键应用程序的需求,特别是在生命科学,验证是必需的,失败是不能接受的。

热封塑料材料的艺术的同时开始或多或少与热塑性材料本身的发展。最初,材料的密封是通过手工意味着简单的热棒或sealbars。当手动密封,密封的时机和质量是不一致的,依赖于操作者的技能。此外,海豹仍热密封方式时删除。因为单片在塑料材料不坚定保税,直到冷却,密封密封的完整性依赖于“热策略”,膜层的能力遵守彼此的同时仍然热封过程。塑料薄膜被修改来增加他们的“hot-tack”品质。这增加了成本的电影,却未必能提高密封的终极力量。同时,这是至关重要的处理温暖的电影非常小心,以避免损坏密封的完整性或外观。引入脉冲封口机器前,密封是通过机器都配备了“热棒”或“热压板”。酒吧和热压板仍在使用应用冷却控制没有一个特定的应用程序的关键。 Plastic sealing machines with “hot bars” use sealing bars that are constantly heated with cartridge heaters that are positioned within the bar as carefully as possible to deliver uniform heating to the sealing surface of the bars. Constantly heated bars and platens are useful in applications where the speed of the machine and the nature of the materials to be sealed offer a wide window of thermal opportunity. Some plastic film materials have a wide temperature range of seal-ability and will seal successfully in spite of a wide variation in sealing temperatures. However, many films do not offer a wide tolerance in the sealing temperature range. Most operations that seal or assemble plastic materials cannot afford the risk and attendant cost of creating defective products caused by a lack of time and temperature control. This is particularly true in packaging for healthcare, food, and precious or noxious materials. In the mid 1940’s “Impulse Heat Sealing” was introduced into the market. This was an important contribution to the art of heat sealing because it provided the opportunity to provide a momentary pulse of power through a relatively thin heating element that was pressed against two or more layers of plastic film. The energy supplied to the band produced enough heat to join the materials and the jaws could remain closed long enough for the seal band to cool and create an acceptable seal. The impulse sealing technique gradually gained acceptance and earned a significant share of the market, especially for sealing polyethylene and similar products. Early impulse heat-sealing machines could only be controlled by setting the voltage that is applied to the heatseal band and setting the timing of the sealing cycle. On manually operated machines, the duration of each cycle was determined from cycle to cycle by the skill of the operator because the temperature of the sealing band and bars became gradually warmer with every cycle. When an equal amount of energy is added to the sealing member with each additional cycle, the sealing temperature gradually rises and ultimately becomes too hot. Therefore, it must be frequently adjusted to avoid overheating

在1970年代,扔GmbH是一家,在德国,认识到需要较高的反应温度控制系统。系统必须不断监测电压的温度区间,提高温度到预定的点以毫秒为单位,并保持它在一个精确点预定密封时间允许密封债券和酷。新系统还需要一个独特的合金,将取代旧的镍铬合金电压。把Alloy-20,®。这个新合金可以预见和显著地改变其电阻作为温度的函数。一个超高响应控制器可以用于监控的实际温度电压乐队通过监测其电阻的变化。

随着搅拌技术的应用逐渐展开,越来越多的定制包装机建筑商把系统适应保证他们的机器的性能。增强的精度变得明显的价值。这创建了一个标准的需求线熔接机完全使用投掷技术。1995年,PackworldUSA成立于应对这种需求。PackworldUSA进入市场生产热合机精度的哲学,质量和耐用性是最高的优先级。这种理念已经被证明是成功的。PackworldUSA机器的价值首先是公认的医疗保健和生命科学公司完美和工艺验证是至关重要的。其他行业很快认识到持久精度热合机每次生计做出完美的海豹。

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