{"id":1318,"date":"2026-09-05T11:36:42","date_gmt":"2026-09-05T03:36:42","guid":{"rendered":"https:\/\/www.jyautobag.com\/?p=1318"},"modified":"2026-09-05T11:36:42","modified_gmt":"2026-09-05T03:36:42","slug":"say-goodbye-to-shrinkage-and-deformation-why-bagging-machines-are-better-suited-for-pulse-heated","status":"publish","type":"post","link":"https:\/\/www.jyautobag.com\/en\/%e5%91%8a%e5%88%ab%e6%94%b6%e7%bc%a9%e5%8f%98%e5%bd%a2%ef%bc%9a%e4%b8%ba%e4%bb%80%e4%b9%88%e8%a3%85%e8%a2%8b%e6%9c%ba%e6%9b%b4%e9%80%82%e5%90%88%e8%84%89%e5%86%b2%e5%bc%8f%e5%8a%a0%e7%83%ad%e5%af%86\/","title":{"rendered":"Say Goodbye to Shrinkage and Deformation: Why Are Bagging Machines Better Suited for Pulse Heating and Sealing?"},"content":{"rendered":"
\"automatic
automatic packaging machine\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Constant-Heat vs. Pulsed Sealing: An Analysis of Key Differences<\/span><\/figcaption><\/figure>\n
\n\n\n\n\n\n\n\n\n\n\n
Dimensions of Comparison<\/span><\/th>\nConstant-Temperature Seal<\/span><\/strong><\/th>\nPulse-type seal<\/span><\/strong><\/th>\n<\/tr>\n<\/thead>\n
How It Works<\/span><\/strong><\/td>\nThe sealing rod remains at a high temperature and instantly melts the surface of the material when it closes.<\/span><\/td>\nAfter the sealing bar closes,<\/span>Instant Heating Upon Power-Up<\/span><\/strong>, after sealing is complete<\/span>Rapid Cooling<\/span><\/strong>\u3002<\/span><\/td>\n<\/tr>\n
The Warming Process<\/span><\/strong><\/td>\nIt requires a warm-up period and consumes power while on standby.<\/span><\/td>\nNo preheating required<\/span><\/strong>, Heats up instantly, ready to use right away.<\/span><\/td>\n<\/tr>\n
Cold-Pressing Process<\/span><\/strong><\/td>\n\u65e0<\/span><\/strong>. The sealing bar remains hot at all times, and the film surface is still very hot when opened.<\/span><\/td>\n\u6709<\/span><\/strong>. Only after the seal has cooled and set under pressure does the sealing bar open.<\/span><\/td>\n<\/tr>\n
Key Advantages<\/span><\/strong><\/td>\nSeal<\/span>Short cycle<\/span><\/strong>... It is fast and suitable for continuous, high-volume production.<\/span><\/td>\nSeal<\/span>Sturdy, smooth, and attractive<\/span><\/strong>, with no risk of shrinkage deformation.<\/span><\/td>\n<\/tr>\n
Major Disadvantages<\/span><\/strong><\/td>\nSeals include<\/span>Shrinkage, distortion, wrinkling<\/span><\/strong>risks that affect both appearance and strength.<\/span><\/td>\nThe sealing cycle is relatively long (including cooling time), which poses a challenge for high-speed production.<\/span><\/td>\n<\/tr>\n
Applicable Scenarios<\/span><\/strong><\/td>\nFor applications where the appearance of the seal is not a major concern, but maximum speed is the priority.<\/span><\/td>\nApplications with high requirements for seal strength and appearance (flatness, uniformity)<\/span><\/strong>, especially for packaging lightweight, precision products.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
\n

Key Differences: The Value of the Cold-Pressing Process<\/span><\/h3>\n

\u201cThe \u201dcold-pressing process\u201c is the core advantage of pulse sealing. It is not merely \u201dcooling,\u201d but rather<\/span>Allow the sealing area to set naturally from the molten state while maintaining pressure.<\/span><\/strong>, which delivers three key benefits:<\/span><\/p>\n

    \n
  1. \n

    A more secure seal<\/span><\/strong>: When the material crystallizes and sets under pressure, the molecules bond more tightly, resulting in higher peel strength.<\/span><\/p>\n<\/li>\n

  2. \n

    A more aesthetically pleasing seal<\/span><\/strong>: No shrinkage, no wrinkles, and a consistent, smooth seal width, which enhances the quality of the product packaging.<\/span><\/p>\n<\/li>\n

  3. \n

    Better material compatibility<\/span><\/strong>: For films that are prone to heat shrinkage and deformation (such as multilayer composite films and thin PE films), the pulsed method can effectively control thermal deformation.<\/span><\/p>\n<\/li>\n<\/ol>\n

    Special Notes Regarding Pre-Opened Packaging<\/span><\/h3>\n

    \u201c<\/span>Pre-cut packaging should use a pulsed heating method.<\/span><\/strong>\u201d, Key Technical Challenges and Solutions:<\/span><\/p>\n

      \n
    • \n

      Challenge<\/span><\/strong>: The opening of pre-cut roll bags is already formed; if the sealing temperature is too high or heat dissipation is uneven, this can easily cause the bag opening to shrink or curl, thereby negating the convenience of the \u201cpre-cut\u201d design.<\/span><\/p>\n<\/li>\n

    • \n

      Solutions<\/span><\/strong>: Combined with pulsed heating<\/span>360\u00b0 Surround Air-Cooling System<\/span><\/strong>, which rapidly and evenly dissipates heat after sealing, effectively solving the problem of \u201cheat buildup,\u201d thereby<\/span>Ensure that the sealing area is smooth and aesthetically pleasing<\/span><\/strong>, to keep the bag smooth.<\/span><\/p>\n<\/li>\n

    • \n

      Why can't pre-gaped bagging machines use constant-heat sealing?<\/span><\/strong><\/p>\n

      In the packaging process for pre-opened pouches, especially<\/span>Manual Feeding<\/span><\/strong>In this operating mode, the constant-temperature sealing method has a critical issue that is easily overlooked:<\/span><\/p>\n

        \n
      1. \n

        Heat continues to build up<\/span><\/strong>: Constant-heat sealing rods maintain a high temperature at all times (typically above 150\u00b0C), continuously radiating heat into the surrounding area whether in standby or active mode.<\/span><\/p>\n<\/li>\n

      2. \n

        Temperature Rise in the Operating Area<\/span><\/strong>: Operators need to<\/span>Up close and repeatedly<\/span><\/strong>Place the product in the bag, seal it, and leave it near a high-temperature heat source for an extended period.<\/span><\/p>\n<\/li>\n

      3. \n

        Impact on Personnel and Quality<\/span><\/strong>\uff1a<\/span><\/p>\n

          \n
        • \n

          For operators<\/span><\/strong>: Prolonged exposure to heat radiation can cause discomfort in the hands and face, create a harsh work environment, accelerate fatigue, and even pose a risk of burns.<\/span><\/p>\n<\/li>\n

        • \n

          Seal Quality<\/span><\/strong>: The constant-heat method lacks a cold-press setting process, making the seal prone to shrinkage and deformation, which compromises the flatness of the pre-gusseted bag.<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

          \u5bf9\u6bd4\u7ef4\u5ea6 \u6052\u70ed\u5f0f\u5bc6\u5c01 \u8109\u51b2\u5f0f\u5bc6\u5c01 \u5de5\u4f5c\u539f\u7406 \u5bc6\u5c01\u68d2\u6301\u7eed\u4fdd\u6301\u9ad8\u6e29\uff0c\u95ed\u5408\u65f6\u77ac\u95f4\u7194\u5316\u6750\u6599\u8868\u9762\u3002 \u5bc6\u5c01\u68d2\u5728\u95ed\u5408\u540e\u77ac\u95f4\u901a […]<\/p>\n","protected":false},"author":1,"featured_media":1006,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[342,343,340,341],"class_list":["post-1318","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-1","tag-342","tag-343","tag-340","tag-341"],"yoast_head":"\n\u544a\u522b\u6536\u7f29\u53d8\u5f62\uff1a\u4e3a\u4ec0\u4e48\u88c5\u888b\u673a\u66f4\u9002\u5408\u8109\u51b2\u5f0f\u52a0\u70ed\u5bc6\u5c01\uff1f - \u667a\u80fd\u88c5\u888b\u00b7\u6309\u9700\u6253\u5370 \u2014\u2014 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