CN116419890A - 感应密封设备 - Google Patents

感应密封设备 Download PDF

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Publication number
CN116419890A
CN116419890A CN202180074926.3A CN202180074926A CN116419890A CN 116419890 A CN116419890 A CN 116419890A CN 202180074926 A CN202180074926 A CN 202180074926A CN 116419890 A CN116419890 A CN 116419890A
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CN
China
Prior art keywords
insert
polymer
sealing device
polymer insert
induction sealing
Prior art date
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Pending
Application number
CN202180074926.3A
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English (en)
Inventor
霍坎·安德松
格洛里亚·吉德蒂
安德里亚·巴比尼
理查德·桑德伯格
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Tetra Laval Holdings and Finance SA
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Tetra Laval Holdings and Finance SA
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Filing date
Publication date
Application filed by Tetra Laval Holdings and Finance SA filed Critical Tetra Laval Holdings and Finance SA
Publication of CN116419890A publication Critical patent/CN116419890A/zh
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • 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
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3604—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint
    • B29C65/3656—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint being a layer of a multilayer part to be joined, e.g. for joining plastic-metal laminates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • 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
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3668—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the means for supplying heat to said heated elements which remain in the join, e.g. special induction coils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • 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
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3672—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the composition of the elements heated by induction which remain in the joint
    • B29C65/3676—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the composition of the elements heated by induction which remain in the joint being metallic
    • B29C65/368—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the composition of the elements heated by induction which remain in the joint being metallic with a polymer coating
    • 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
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    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • 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
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/23—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations
    • B29C66/232—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations said joint lines being multiple and parallel, i.e. the joint being formed by several parallel joint lines
    • 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
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/431—Joining the articles to themselves
    • B29C66/4312—Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • 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
    • 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
    • B29C66/71—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 composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • 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
    • 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
    • B29C66/723—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 multi-layered
    • B29C66/7232—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 multi-layered comprising a non-plastics layer
    • B29C66/72321—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 multi-layered comprising a non-plastics layer consisting of metals or their alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • 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
    • 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
    • B29C66/723—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 multi-layered
    • B29C66/7232—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 multi-layered comprising a non-plastics layer
    • B29C66/72327—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 multi-layered comprising a non-plastics layer consisting of natural products or their composites, not provided for in B29C66/72321 - B29C66/72324
    • B29C66/72328—Paper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • 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
    • 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
    • B29C66/723—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 multi-layered
    • B29C66/7234—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 multi-layered comprising a barrier layer
    • B29C66/72341—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 multi-layered comprising a barrier layer for gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
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    • B29C66/812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8122—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the composition of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
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    • B29C66/812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8126—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/81262—Electrical and dielectric properties, e.g. electrical conductivity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • 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
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    • B29C66/80—General aspects of machine operations or constructions and parts thereof
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    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81415—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/80—General aspects of machine operations or constructions and parts thereof
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    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
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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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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
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    • H05B6/105—Induction heating apparatus, other than furnaces, for specific applications using a susceptor
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
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    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/14—Tools, e.g. nozzles, rollers, calenders
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
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    • B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
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Abstract

一种对用于生产可倾倒食品的密封包装的包装材料进行热封的感应密封设备(15)，所述密封设备(15)包括：电感器(16)，其被配置为在所述包装材料中感应电流，所述电感器(16)包括导体元件(20、21)；聚合物插入件(40)，其保持所述导体元件(20、21)；和支撑主体(24)，其保持所述聚合物插入件(40)；其中所述聚合物插入件(40)包括其中分散有石墨烯颗粒的聚合物基质。

Description

感应密封设备
技术领域
本发明总体上涉及一种感应密封设备。
背景技术
许多可倾倒的食品，例如果汁、超高温灭菌牛奶、葡萄酒、番茄酱等，都是以经过灭菌的包装材料制成的包装出售的。此类包装的典型示例是称为Tetra Brik Aseptic(注册商标)的用于液体或可倾倒食品的平行六面体形包装，其通过折叠和密封层压条形包装材料制成。
包装材料具有多层结构，该多层结构基本上包括：用于刚度和强度的基层，其可以包括纤维材料层，例如纸或矿物填充聚丙烯材料层；和多个热封塑料材料层，例如聚乙烯薄膜，其覆盖在基层的两侧。
在用于长期储存产品(例如UHT牛奶)的无菌包装的情况下，包装材料还包括：气体和光阻隔材料层，例如铝箔或乙基乙烯醇(EVOH)膜，其叠加在热封塑料材料层上，然后再覆盖形成最终与食品接触的包装内表面的另一热封塑料材料层。
众所周知，这种包装是在全自动包装单元上生产的，在该单元上由幅材进给式包装材料形成连续管；包装材料幅材在包装单元上灭菌，例如通过应用化学灭菌剂(例如过氧化氢溶液)灭菌，一旦灭菌完成，就将其从包装材料的表面去除，例如加热蒸发；如此灭菌的包装材料幅材保持在封闭、无菌的环境中，并纵向折叠和密封以形成竖直管。
管沿着第一竖直方向连续进给，填充灭菌或无菌处理的食品，并由两对夹爪以等间隔的横截面夹持。更具体地，两对夹爪循环且连续地作用在管上，将管的包装材料热封，以形成通过各自的横向密封带相互连接的连续的枕形包带，该横向即沿垂直于第一方向的第二方向延伸。
通过切割相关的横向密封带将枕形包分开，然后进给至最终折叠站，在这里它们被机械折叠成最终的平行六面体形状。
被夹在每对夹爪之间的管部分通过安装在其中一个夹爪(称为密封夹爪)上并且局部熔化夹在夹爪之间的两个热封塑料材料层的加热装置进行热封。
更具体地，当管被夹爪夹住时，包装材料(其中阻隔材料层包括导电材料(例如铝)片)通常通过所谓的感应热封工艺进行热封。在感应热封过程中，感应热封设备在铝片中感应涡流，以对铝片进行局部加热，从而使热封塑料材料局部熔化。
更具体地，在感应密封设备中，加热装置实质上包括由高频电流发生器供电的电感器。这里的电感器基本上包括一个或多个由导电材料制成的导体元件，所述导电元件与管材料相互作用以在其中感应涡流并将其加热到必要的密封温度。
包括上述类型的电感器的密封设备是已知的，例如来自专利文件EP 1 270 182和EP 2 008 795。
更具体地，已知的密封设备可以包括：支撑主体，该支撑主体一体地连接到密封夹爪并且限定用于容纳相应电感器的两个前座；以及由磁通量集中材料(特别是包含铁氧体的复合材料)制成并容纳在支撑主体内的插入件，其靠近导体元件。
更具体地，支撑主体与插入件协作，并且限定密封设备的围绕导体元件和磁通量集中的材料插入件的外围部分。
尽管目前的感应密封设备具有许多优点，但在例如在耐用性、成本效益和密封速度方面仍有改进的空间。
发明内容
本发明的一个目的是提供一种耐用的感应密封设备。本发明的另一个目的是提供一种具有成本效益的感应密封设备。本发明的另一个目的是促进感应密封设备的高密封速度。
本发明的这些和其他目的至少部分地由独立权利要求中定义的本发明实现。优选实施方案在从属权利要求中列出。
根据本发明的第一方面，提供了一种用于热封包装材料以生产可倾倒食品的密封包装的感应密封设备，所述密封设备包括：
电感器，其被配置为在包装材料中感应电流，该电感器包括导体元件；
聚合物插入件，其保持所述导体元件；和
支撑主体，其保持所述聚合物插入件；
其中聚合物插入件包括其中分散有石墨烯颗粒的聚合物基质。
发明人已经意识到感应密封设备的有效热管理具有几个优点。
首先，高效的热管理可实现耐用且具有成本效益的感应密封设备。特别地，电感器密封设备的电感器可能被高温损坏并且需要维护和/或更换。当电感器损坏或达到其预计使用寿命时，可能需要更换带有聚合物插入件和电感器的整个支撑主体。由于用于包装的整个生产线或生产线的一部分可能依赖于感应密封设备，所以所述感应密封设备的维护可能与巨大的成本相关联。因此，电感器和/或电感器附近的部件的有效冷却可以提高感应密封设备的耐久性并且从而降低与生产过程中的维护中断相关的成本和与备件相关的成本。
其次，高效的热管理可实现高密封速度。在密封过程中，可以开启电感器以在包装材料的导电材料中感应涡流，使得其被加热到密封温度，由此热封塑料材料至少部分熔化。随后，可以关闭电感器，由此热封塑料材料可以凝固，例如在被密封钳夹住的同时凝固。因此，电感器和/或电感器附近的部件的有效冷却可以减少凝固热封塑料材料所需的时间。热封塑料材料凝固得越快，密封夹爪释放包装材料的速度就越快。因此，有效的热管理可实现高密封速度。
发明人已经认识到，可以通过将石墨烯颗粒分散在聚合物插入件中来促进感应密封设备的有效热管理。聚合物插入件保持电感器的导体元件，而支撑主体保持聚合物插入件。通过将石墨烯颗粒分散在聚合物插入件的聚合物基质中，可以增加聚合物插入件的热导率。因此，聚合物插入件可以将热量从电感器传导走，例如，到达支撑主体，使得电感器被有效地冷却。此外，聚合物插入件可以将热量从热封塑料材料中传导出去，例如到达支撑主体，使得热封塑料材料被有效地冷却。
聚合物插入件热导率增大的原因可能是石墨烯的高热导率，对于单层石墨烯为约1000-5000Wm-1K-1的热导率。包含石墨烯的聚合物插入件的热导率可能较低。尽管如此，当将石墨烯添加到聚合物基质中时，仍可以看到聚合物插入件的热导率的显著提高。
发明人已经意识到，即使石墨烯具有高电子迁移率，导体元件也可能不会由于石墨烯分散在聚合物插入件的聚合物基质中而短路。因此，即使高电子迁移率可能出现问题，测试表明，当石墨烯分散在聚合物插入件的聚合物基质中时，感应密封设备的性能可能会提高。
发明人已经意识到在选择要分散在聚合物基质中的颗粒以降低生产过程中的缺陷率时必须非常小心。聚合物插入件通常通过将熔化的聚合物浇铸在模具中来生产。例如，将熔化的聚合物基质浇铸在支撑主体的凹槽中。如果熔化的聚合物没有完全填充模具，则生产的聚合物插入件可能有缺陷，需要丢弃。此外，在浇铸过程中，添加到聚合物基质中的填料可能会发生偏析，这可能会导致一些感应密封设备出现故障并需要丢弃。认识到使用石墨烯时生产缺陷率可能较低，可以节省成本。生产缺陷率低的原因可能是石墨烯在聚合物插入件的聚合物基质中的分散并没有显著降低熔融聚合物基质的熔体流动速率。从而熔化的聚合物基质可以容易地填充模具。低生产缺陷率的另一个原因可能是石墨烯在聚合物插入件的聚合物基质中的分散不会导致石墨烯的显著偏析。因此，石墨烯可以均匀地分布在聚合物插入件内。
此外，石墨烯可表现出良好的机械性能。例如，石墨烯的机械强度可能为约100-1100GPa，杨氏模量为约1TPa。因此，聚合物插入件的机械性能可能不会由于石墨烯在聚合物插入件的聚合物基质中的分散而降低。具有良好机械性能的耐用聚合物插入件可能很重要，因为当包装单元反复抓取和释放包装材料时，磨损可能会很高。因此，不降低聚合物插入件的机械性能对于减少与损坏的聚合物插入件相关的维护可能很重要。这可以进而导致节省成本。
电感器包括可以形成电感器回路的部分的导体元件。电感回路也可称为导线回路。导体元件可以是导电线或导电棒。电感器可以包括例如一个或两个电感器回路。因此，电感器可以是单回路电感器或双回路电感器。当然，电感器可以包括多于两个的回路。
电感器可以被配置为连接到交流发电机，例如高频发电器。电感器可以被配置为使得电感器中(例如，在电感器的回路中)的交流电感应交变磁场。交变磁场又可以感应出电流，例如在包装的铝箔中的涡流。
聚合物插入件可以被配置为以各种方式保持导体元件。聚合物插入件可以单独或与其他部件(例如，与感应密封设备的支撑主体或其他部件)配合使用。例如，导体元件可以部分地或完全地封装在聚合物插入件中。替代地，聚合物插入件可将导体元件压靠在感应密封设备的支撑主体或其他部件上。
支撑主体可以被配置为以各种方式保持聚合物插入件。支撑主体可以单独地或与其他部件一起保持聚合物插入件。例如，聚合物插入件可以部分地或完全地封装在支撑主体中。
石墨烯颗粒可以作为填料分散在聚合物插入件的聚合物基质中。聚合物插入件的聚合物基质可以另外包含其他填料。石墨烯颗粒可以是单层石墨烯。替代地，石墨烯颗粒可以是多层石墨烯，其中多层石墨烯包含多达5个、多达10个或多达20个的单石墨烯层(single graphene layers)。替代地，石墨烯颗粒可以是单层和多层石墨烯的混合物。
聚合物插入件可以包括分散到聚合物插入件的聚合物基质中的磁性颗粒，由此聚合物插入件形成磁通集中的插入件。
磁性颗粒可包括铁磁或亚铁磁颗粒。磁性颗粒可以包括以下材料中的至少一种：铁氧体、NiZn铁氧体、FeSiAl(铁硅铝粉)、FeSiB合金(或其衍生物)和FeNi合金(或其衍生物)。
磁通集中的插入件可用于集中由电感器产生的磁场，从而提高感应密封设备的效率。为了使磁通集中的插入件有效地工作，它通常布置在电感器的导体元件附近，例如保持导体元件。因此，包含磁性颗粒和石墨烯的聚合物插入件可以起到双重作用，即用作磁通集中的插入件和冷却电感器的热导体。
替代地，聚合物插入件可以被配置成保持磁通集中的插入件，其中磁通集中的插入件包括其中分散有磁性颗粒的聚合物基质。因此，包含石墨烯颗粒的聚合物插入件可以不同于磁通集中的插入件。然而，在保持磁通集中的插入件的同时，包含石墨烯的聚合物插入件也可以将热量从磁通集中的插入件和/或从电感器传导走。因此，包含石墨烯颗粒的聚合物插入件可起到双重作用，即用作磁通集中的插入件的保持器和冷却电感器的热导体。
聚合物插入件可以配置为具有高于100V/mm的阈值的介电强度。这样的介电强度可以确保导体元件不会短路，即电流不会沿着两个导体元件之间的非预期路径行进。从一个导体元件通过聚合物插入件的聚合物基质到另一个导体元件的电流路径可能会降低电感器的功能。这样的电流路径可能导致电感器的回路的仅一部分被激活并产生磁场。因此，热封塑料材料可能不会在预期区域上被加热，从而导致横向密封带短或弱。应当理解，对于不同的实施方案，聚合物插入件的介电强度的可接受阈值可能不同。在一些实施方案中，聚合物插入件可以例如被配置为具有高于400V/mm的阈值的介电强度。
感应密封设备可以配置为使聚合物插入件中的石墨烯颗粒的浓度低于15％的阈值。这样的石墨烯颗粒浓度可确保聚合物插入件的介电强度足够高以防止导体元件短路。这种石墨烯颗粒的浓度可以促进感应密封设备的简单结构设计。例如，如果聚合物插入件中石墨烯颗粒的浓度低于15％，则可以将电感器直接封装在聚合物插入件中。当电感器直接封装在聚合物插入件中时，两个导体元件之间可能存在经由聚合物插入件的路径，其中该路径仅穿过聚合物插入件。聚合物插入件中石墨烯颗粒的浓度低于15％可确保所述路径不短路。然而，应当理解，如果进一步提供用于电绝缘的装置，则聚合物插入件可包含多于15％的石墨烯。例如，如果导体元件具有电绝缘涂层，例如聚合物涂层在被封装在聚合物插入件中之前几乎没有或没有石墨烯，聚合物插入件可以包含多于15％的石墨烯。浓度可以通过重量来计量。
应理解，应当防止短路的导体元件之间的距离可能影响聚合物插入件可以包含多少石墨烯。
因此，在某些情况下，聚合物插入件中石墨烯颗粒的浓度低于10％的阈值可能是有利的。这可能例如使导体元件之间的距离很短。因此，它可以使感应密封设备能够包括双回路电感器，其中导体元件可以紧密地间隔开，直接封装在聚合物插入件中。在某些情况下，聚合物插入件中石墨烯颗粒的浓度低于7.5％的阈值甚至可能是有利的。在一些情况下，导体元件之间的距离可以如此长，以致聚合物插入件可以包含多于15％的石墨烯。
感应密封设备的聚合物插入件可包括分散到聚合物插入件的聚合物基质中的电绝缘颗粒。发明人已经意识到，添加电绝缘颗粒可以提高聚合物插入件的介电强度。在聚合物插入件中添加电绝缘颗粒可以允许添加更高百分比的石墨烯，而不会导致介电强度太低。因此，包含石墨烯和电绝缘颗粒两者的聚合物插入件可以具有高热导率，从而是耐用的和具有成本效益的。
电绝缘颗粒可以被配置成具有高于聚合物基质的热导率。此外，电绝缘颗粒可以被配置为具有高于1kV/mm的阈值的介电强度。因此，与聚合物基质中没有电绝缘颗粒分散相比，电绝缘颗粒可以提高聚合物基质的热导率和/或介电强度。根据应用的不同，电绝缘颗粒的介电强度的阈值可能不同。例如，聚合物插入件包含的石墨烯聚合物基质越多，电绝缘颗粒的介电强度的阈值就会越高。因此，电绝缘颗粒可以被配置为具有高于10kV/mm、20kV/mm或30kV/mm的阈值的介电强度。
电绝缘颗粒可包含氮化硼颗粒。替代地，所述电绝缘颗粒为氮化硼颗粒。氮化硼可能具有高的介电强度。因此，当氮化硼分散在聚合物插入件的聚合物基质中时，聚合物插入件的介电强度可能是高的，即使聚合物插入件还包含石墨烯也如此。此外，氮化硼可能具有高热导率，某些形式的氮化硼可具有高达2000Wm-1K-1的热导率。因此，氮化硼本身可能有助于聚合物插入件的热导率，此外还提供介电强度，使石墨烯的百分比更高。此外，使用氮化硼时生产缺陷率可能较低，从而可以节省成本。生产缺陷率低的原因可能是氮化硼在聚合物插入件的聚合物基质中的分散不会显著降低熔融聚合物基质的熔体流动速率。
感应密封设备可以被配置为聚合物插入件中的氮化硼颗粒的浓度低于20％的阈值。这样的阈值可以确保聚合物插入件的生产缺陷率足够低。浓度可以通过重量来计量。
感应密封设备的聚合物插入件可以配置成具有高于0.2Wm-1K-1的阈值的热导率。这样的热导率可以确保电感器的有效冷却。应当理解，什么被认为是足够有效地冷却电感器可以根据应用而变化。某些类型的热封塑料材料可能需要更高的温度和/或更高的电感电流才能熔化，在这种情况下，可能要求聚合物插入件具有更高的热导率阈值。热封的高重复频率也可能需要更有效的冷却，在这种情况下，可能需要聚合物插入件具有更高的热导率阈值。因此，在一些实施方案中，感应密封设备的聚合物插入件可被配置成具有高于0.3Wm-1K-1的阈值的热导率。在其他实施方案中，感应密封设备的聚合物插入件可以配置成具有高于0.4Wm-1K-1的阈值的热导率。在其他实施方案中，感应密封设备的聚合物插入件可以配置成具有高于0.5Wm-1K-1的阈值的热导率。
感应密封设备的聚合物插入件的聚合物基质可以是聚苯硫醚(PPS)。PPS可以特别与包含石墨烯和/或氮化硼的填料相容。对于具有PPS聚合物基质的聚合物插入件，生产缺陷率会较低。PPS可能具有比替代聚合物更高的熔体流动速率。因此，在生产缺陷率变得严重之前，更多的石墨烯和/或氮化硼可以分散在PPS中。
替代地，其他聚合物可用作聚合物插入件的聚合物基质。例如，其他热塑性聚合物可以用作聚合物插入件的聚合物基质。例如，聚醚醚酮(PEEK)可以用作聚合物插入件的聚合物基质。
感应密封设备的聚合物插入件可以包括增强纤维。这可能是有利的，因为它可以提高聚合物插入件的机械性能，从而提高耐久性。增强纤维可以是例如玻璃纤维。
感应密封设备可包括至少一个将两个导体元件分开的凹槽。凹槽可以是聚合物插入件中的凹槽。凹槽可形成切割凹槽。凹槽可以布置在电感器的两个回路之间。因此，每个回路可在包装材料中形成密封并且凹槽可允许切割器(例如，刀片)用于切割回路之间的包装材料。凹槽可以附加地或替代地分隔两个导体元件，从而降低导体元件之间短路的风险。因此，更多的石墨烯可以分散在聚合物插入件或聚合物插入件的部分中，使得热导率增大而不会增加短路的风险。
感应密封设备的支撑主体可以由金属制成。这可以进一步改善电感器的冷却。热量可以从电感器的导体元件经由保持导体元件的聚合物插入件传导到保持聚合物插入件的支撑主体。金属在本文中可被视为良好的热导体，其可进一步移除热量。
感应密封设备的聚合物插入件可被配置成使得当聚合物基质处于熔化形式时，具有分散颗粒的聚合物基质具有高于阈值40的熔体流动速率。高于阈值40的熔体流动速率可以使聚合物插入件能够通过注塑成型来生产。这可能是一种具有成本效益的生产方法。所需的阈值可能因应用而异。例如，如果聚合物插入件包含小特征，则较高的熔体流动速率阈值可能有利于确保熔融形式的聚合物基质完全填充模具。因此，作为阈值40的替代，阈值可以是例如50。熔体流动速率可以是根据标准(例如ISO 1133)测量的熔体流动速率。熔体流动速率可以在316℃的温度下测量，熔化的聚合物基质承受5kg的重量。
附图说明
参照附图，通过以下说明性的和非限制性的详细描述，将更好地理解本发明构思的上述内容以及附加目的、特征和优点。在附图中，除非另有说明，否则相似的附图标记将用于相似的元件。
图1a显示了感应密封设备的横截面。
图1b显示了感应密封设备的电感器的电路示意图。
图2a-b显示了感应密封设备的横截面。
图3a-d显示了感应密封设备的横截面。
图4显示了测得的热导率。
图5显示了测得的击穿电压。
图6显示了测量的流动长度。
具体实施方式
下面将描述用于生产可倾倒食品的密封包装的热封包装材料的多个感应密封设备15。感应密封设备15可被配置成沿方向A压靠在包装材料上。在包装材料的密封过程中，包装材料可被感应密封设备15和砧座压在相对侧上。
图1a以剖视图示出了感应密封设备15，其中方向B垂直于横截平面。在感应密封设备15中，聚合物插入件40保持电感器16的导体元件20、21，而支撑主体24保持聚合物插入件40。聚合物插入件40包括聚合物基质。在图1a中，聚合物插入件40包括分散到聚合物插入件40的聚合物基质中的磁性颗粒，由此聚合物插入件40形成磁通集中的插入件30。
图1b示出了图1a中的电感器16的示意性电路图，如在与方向B正交的方向A上所见。所示电感器16包括导电条形式的导体元件20、21。两个导体元件20、21可以形成电感器回路的一部分。图1b示出了双回路电感器16，其包括第一电感器回路16'和第二电感器回路16”。感应密封设备15当然可以包括任意数量的电感器回路。电感器16可以连接到交流发电机，例如高频发电机(图中未显示)。
在图1a中，聚合物插入件40是磁通集中的插入件30。作为替代，聚合物插入件40可以保持磁通集中的插入件30，如图2a和2b所示。因此，如图2a和2b所示，一种包含磁性颗粒的聚合物基质可以形成磁通集中的插入件30，而单独的聚合物插入件40(其包括聚合物基质和例如石墨烯和/或氮化硼)将热量从电感器16传导走。替代地，如图1a所示，聚合物基质可以包括磁性颗粒和导热颗粒，例如石墨烯和/或氮化硼。
在图1a中，聚合物插入件40通过部分封装导体元件20、21来保持导体元件20、21，这里在三个侧面上封装导体元件20、21。作为替代方案，聚合物插入件40可以通过保持感应密封设备15的另一部分来保持导体元件20、21，该另一部分进而保持导体元件20、21。图2a图示了固定感应密封设备15的另一部分的聚合物插入件40，在这种情况下是磁通集中的插入件30，其进而保持导体元件20、21。作为进一步的替代方案，聚合物插入件40可以通过将导体元件20、21压靠在感应密封设备15的支撑主体24或另一部分来保持导体元件20、21。图2b示出了通过将导体元件20、21压靠在感应密封设备15的另一部分上来保持导体元件20、21的聚合物插入件40，在这种情况下是磁通集中的插入件30。
对于感应密封设备15，有许多可想到的设计选项。除了图1a和图2a-b中所示的设计选项之外，图3a-d中还显示了一些设计选项。感应密封设备15可以被配置为使电感器16和/或磁通集中的插入件30非常靠近包装材料。例如，感应密封设备15可以被配置成沿图中所示的方向A压靠包装材料。
感应密封设备15的被配置为压靠包装材料的表面可装配有一个或多个脊51，该脊51被配置为向包装材料提供局部压力。脊51可以由磁通集中的插入件30形成，例如，如图1a所示，通过聚合物插入件40形成，例如如图2b所示，或通过导体元件20、21形成，例如，如图3b所示。脊51可以布置在导体元件20、21处，例如，如图1a或图3b所示，或在两个导体元件20、21之间，例如，如图2a所示。替代地，感应密封设备15可以没有脊51，如图3a、3c和3d所示。
如图3a所示，感应密封设备15的被配置成压在包装材料上的表面可以是倾斜的。因此，感应密封设备15可构造成将可倾倒食品挤压远离感应密封设备15的中心区域。由此，会降低可倾倒食品破坏密封的风险。
感应密封设备15的电感器16可包括第一电感器回路16’和第二电感器回路16”，如例如图1a和图3c所示。替代地，感应密封设备15的电感器16可仅包括第一电感器回路16’，如图3d所示。
感应密封设备15可包括凹槽33。凹槽33可形成切割凹槽。凹槽可以布置在两个电感器回路16’和16”之间，例如，如图1a所示。因此，每个电感器回路可以在包装材料中形成密封并且凹槽33可使得切割器(例如，刀片)能用于切割回路之间的包装材料。凹槽33可以附加地或替代地分隔两个导体元件20、21，从而降低导体元件20、21之间短路的风险。
支撑主体24，例如在图1-3所示的任何设备中，可以由金属制成。替代地，支撑主体24可以由陶瓷制成。替代地，支撑主体24可以由具有导热填料的聚合物(例如石墨烯)制成。
感应密封设备15可以包括冷却系统，例如使冷却液循环的冷却系统。冷却系统可以连接到感应密封设备15的支撑主体。
聚合物插入件40的聚合物基质，例如在图1-3所示的任何设备中，可以是聚苯硫醚(PPS)。磁通集中的插入件30的聚合物基质，例如在图1-3所示的任何设备中，可以是PPS。其他聚合物基质可替代地用于聚合物插入件40或磁通集中的插入件30中的任一者。例如，其他热塑性聚合物可用作聚合物基质。例如，聚醚醚酮(PEEK)可以用作聚合物基质。
导热颗粒可以分散在聚合物插入件40(例如在图1-3所示的任何设备的聚合物插入件40)的聚合物基质中。导热颗粒可以是石墨烯和/或氮化硼。例如，聚合物插入件40可包括其中分散有石墨烯和/或氮化硼的PPS聚合物基质。
石墨烯颗粒可具有一个单层的厚度。石墨烯颗粒可具有大于一个单层的厚度。石墨烯颗粒的厚度可以由厚度分布表示，例如10-100％的颗粒具有单层厚度。石墨烯颗粒的横向尺寸可以是例如0.1-10μm或0.0001-2mm。石墨烯颗粒可以通过以下方式剥离：例如石墨的液相剥离、石墨的氧化以及随后的剥离和/或还原、或化学气相沉积。
氮化硼颗粒可以是六方、立方或纤锌矿形式。氮化硼颗粒可以具有片晶形状。可以替代地使用其他形状的氮化硼颗粒，例如颗粒、薄层(platelets)颗粒、团块或薄层团块。氮化硼颗粒的尺寸可以是例如0.1-10μm或0.0001-2mm。
当填料分散在聚合物插入件40的聚合物基质中时，聚合物基质的特性可能会改变。可能发生变化的特性的示例有：热导率、介电强度和熔体流动速度。在下文中，PPS的上述特性将作为两种填料石墨烯和氮化硼的填料浓度的函数进行讨论。测量的填料浓度为0％、5％、7.5％和10％。浓度按重量来计量。
图4显示了测得的PPS的热导率与石墨烯和氮化硼填料的浓度的函数关系。从图中可以看出，石墨烯和氮化硼的热导率都随着填料浓度的增加而增加。纯PPS的热导率为0.326Wm-1K-1。含有10％石墨烯的PPS的热导率为1.019Wm-1K-1，大约增加了210％。含有10％氮化硼的PPS的热导率为0.502Wm-1K-1，大约增加了50％。在更高的填料浓度下，可以预期热导率进一步增大。进一步测量的热导率可在表1中找到。
Figure BDA0004211653500000121
Figure BDA0004211653500000131
表1
图5显示了在0.5毫米厚样品上测量的，PPS的最高测量击穿电压与石墨烯和氮化硼填料浓度的函数关系。介电强度可以是击穿电压除以样品厚度。应该注意的是，一些样品的击穿电压低于所提供的样品。然而，在给定的填料浓度下实现最高可能的击穿电压可能是制造过程优化的问题。因此，感兴趣的是测得的最高击穿电压。从图中可以看出，击穿电压会随着氮化硼浓度的增加而增加。此外，击穿电压可随着石墨烯浓度的增加而降低。纯PPS显示出2088V的击穿电压，其可能对应于4176V/mm的介电强度。含有10％石墨烯的PPS显示出102V的最高击穿电压，其可能对应于204V/mm的介电强度。含有10％氮化硼的PPS显示出2339V的最高击穿电压，其可能对应于4678V/mm的介电强度。但是，应当注意的是，根据材料规格，纯PPS的介电强度可以在11-24kV/mm的范围内。因此，测量结果可能会低估实际介电强度达到介于2/3到5/6之间。
图6显示了PPS的蛇形流动测试的测量流动长度与石墨烯和氮化硼填料浓度的函数关系。流动长度是通过将具有分散填料的熔融聚合物基质注射成型到具有蛇形构造的模具中来测量的。在约335℃的熔体温度、150MPa的注射压力和40ccm/s的注射速度下进行注射成型。从图中可以看出，观察到流动长度随着石墨烯和氮化硼两者的填料浓度而降低。所有测量的流动长度对应于40以上的熔体流动速率。
基于图4-6中呈现的研究，估计聚合物插入件40可能具有以下配置之一：
图1-3的设备中的至少一些的聚合物插入件40，例如图2a或2b的设备可以由其中分散了15％的石墨烯的PPS制成。
图1-3的设备中的至少一些的聚合物插入件40，例如图2a或2b的设备可以由其中分散了30％氮化硼的PPS制成。
图1-3的设备中的至少一些的聚合物插入件40，例如图1a或3a的设备可以由其中分散有15％的石墨烯和60％的铁氧体的PPS制成，使得聚合物插入件40形成磁通集中的插入件30。
图1-3的设备中的至少一些的聚合物插入件40，例如图1a或3a的设备可以由其中分散有20％的氮化硼和60％的铁氧体的PPS制成，使得聚合物插入件40形成磁通集中的插入件30。
图1-3的设备中的至少一些的聚合物插入件40，例如图1a或3a的设备可由其中分散有10％的石墨烯、10％的氮化硼和60％的铁氧体的PPS制成，使得聚合物插入件40形成磁通集中的插入件30。
图1-3的设备中的至少一些的聚合物插入件40，例如图1a或3a的设备可以由其中分散有20％的石墨烯、20％的氮化硼和50％的铁氧体的PPS制成，使得聚合物插入件40形成磁通集中的插入件30。
图1-3的设备中的至少一些的聚合物插入件40，例如图1a或3a的设备可以由其中分散有5％的石墨烯、5％的氮化硼和80％的铁氧体的PPS制成，使得聚合物插入件40形成磁通集中的插入件30。
以上主要参考有限数量的示例描述了本发明构思。然而，如本领域的技术人员容易理解的那样，在所附权利要求限定的发明构思的范围内，除了上面公开的示例之外的其他示例同样是可能的。

Claims (13)

1.一种对用于生产可倾倒食品的密封包装的包装材料进行热封的感应密封设备(15)，所述密封设备(15)包括：
电感器(16)，其被配置为在所述包装材料中感应电流，所述电感器(16)包括导体元件(20、21)；
聚合物插入件(40)，其保持所述导体元件(20、21)；和
支撑主体(24)，其保持所述聚合物插入件(40)；
其中所述聚合物插入件(40)包括其中分散有石墨烯颗粒的聚合物基质。
2.根据权利要求1所述的感应密封设备(15)，其中所述聚合物插入件(40)包括分散到所述聚合物插入件(40)的所述聚合物基质中的磁性颗粒，由此所述聚合物插入件(40)形成磁通集中的插入件(30)。
3.根据权利要求1所述的感应密封设备(15)，其中，所述聚合物插入件(40)被配置为保持磁通集中的插入件(30)，其中所述磁通集中的插入件(30)包括聚合物基质，磁性颗粒被分散到所述聚合物基质中。
4.根据前述权利要求中任一项所述的感应密封设备(15)，其中，所述聚合物插入件(40)中的石墨烯颗粒的浓度低于15％的阈值。
5.根据前述权利要求中任一项所述的感应密封设备(15)，其中，所述聚合物插入件(40)还包括分散到所述聚合物插入件(40)的所述聚合物基质中的电绝缘颗粒。
6.根据权利要求5所述的感应密封设备(15)，其中，所述电绝缘颗粒包括氮化硼颗粒。
7.根据权利要求6所述的感应密封设备(15)，其中，所述聚合物插入件(40)中的氮化硼颗粒的浓度低于20％的阈值。
8.根据前述权利要求中任一项所述的感应密封设备(15)，其中，所述聚合物插入件(40)被配置成具有高于0.2W/(mK)的阈值的热导率。
9.根据前述权利要求中任一项所述的感应密封设备(15)，其中，所述聚合物插入件(40)的所述聚合物基质是聚苯硫醚(PPS)。
10.根据前述权利要求中任一项所述的感应密封设备(15)，其中所述聚合物插入件(40)包括增强纤维。
11.根据前述权利要求中任一项所述的感应密封设备(15)，其还包括至少一个将两个导体元件(20、21)分开的凹槽(33)。
12.根据前述权利要求中任一项所述的感应密封设备(15)，其中，所述支撑主体(24)由金属制成。
13.根据前述权利要求中任一项所述的感应密封设备(15)，其中，所述聚合物插入件(40)被配置成使得当所述聚合物基质为熔融形式时，具有分散颗粒的所述聚合物基质的熔体流动速率高于40的阈值。
CN202180074926.3A 2020-11-06 2021-11-02 感应密封设备 Pending CN116419890A (zh)

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