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<\/p>\nWhen factories around the world order a\u00a0tray sealing machine<\/b>, a\u00a0MAP tray sealer<\/b>, o un\u00a0vacuum skin packaging machine<\/b>\u00a0from DJPACK (Wenzhou Dajiang Vacuum Packaging Machinery Co., Ltd.), one question frequently comes up:<\/p>\n
\u201cWhy do I need to send my trays and film to your factory?\u201d<\/b><\/p>\n
At first glance, it may seem like an extra step. But for packaging equipment, this step is essential. In fact, it is the most reliable way to ensure a new machine performs flawlessly the moment it arrives at a customer\u2019s facility.<\/p>\n
This article explains\u2014using simple language and real engineering logic\u2014why sample trays and films matter, how they influence mold accuracy, and why global factories benefit from this process.<\/p>\n
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To many buyers, a plastic tray is just a plastic tray.<\/p>\n
But to a manufacturer of\u00a0m\u00e1quinas selladoras de bandejas<\/b>, every tray is a unique object with its own\u00a0geometry, its own material behavior, and its own sealing requirements.<\/p>\n
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Customers from different countries measure lengths in different ways:<\/p>\n
This leads to misunderstanding because a custom mold needs\u00a0exact rim-to-rim data<\/b>, not approximate numbers. Even a 1- 2mm deviation can affect sealing performance.<\/p>\n
When DJPACK receives physical trays:<\/p>\n
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Even if two trays share the same volume or size label, their physical structure can be totally different. This is the part most buyers don\u2019t realize until they purchase a sealing machine.<\/p>\n
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Some countries produce trays with narrow sealing rims; others prefer wide rims for strength.<\/p>\n
A mold must match these rims exactly\u2014otherwise the sealing bar cannot deliver consistent pressure.<\/p>\n
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Tray walls may be:<\/p>\n
These small differences influence how the tray sits inside a mold and how the sealing pressure distributes across its surface.<\/p>\n
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In many trays, the flange is not flat\u2014it is slightly curved, bent, or reinforced for stacking. This angle directly affects sealing accuracy. If the mold does not match the angle, air leaks can appear even when temperature and pressure are correct.<\/p>\n
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DJPACK\u2019s engineers evaluate:<\/p>\n
This enables them to design molds that are not only accurate but also\u00a0stable under repeated sealing cycles<\/b>, giving customers consistent results and longer machine life.<\/p>\n
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Many customers ask:\u00a0\u201cWhy do you need so many trays? Isn\u2019t a few enough?\u201d<\/b><\/p>\n
Actually, no.<\/p>\n
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When a tray is heat-sealed and the film is peeled off for inspection:<\/p>\n
Once this happens, the tray cannot be used for another test.<\/p>\n
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To optimize factory settings, engineers must run dozens of tests to determine:<\/p>\n
Each test consumes trays.<\/p>\n
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If only a few trays are supplied, the same trays end up being tested repeatedly. Heat, pressure, and mechanical movement can gradually deform them. A deformed tray can mislead the engineer into thinking:<\/p>\n
Only\u00a0fresh and undeformed trays<\/b>\u00a0allow accurate judgment.<\/p>\n
<\/p>\n
Enough trays ensure:<\/p>\n
It truly benefits both\u00a0manufacturer and clients.<\/p>\n
![\"\"](\"https:\/\/www.djpackmachinery.com\/wp-content\/uploads\/2026\/07\/why-sending-sample-trays-and-films-matters2.png\")
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Trays used for sealed packaging are made from a variety of materials:<\/p>\n
Each material has completely different behavior under heat.<\/p>\n
<\/p>\n
Por ejemplo:<\/p>\n
<\/p>\n
Some materials absorb heat slowly.<\/p>\n
Some absorb heat too quickly.<\/p>\n
Some soften unevenly.<\/p>\n
DJPACK adjusts sealing time and pressure based on these behaviors.<\/p>\n
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A mismatch can cause:<\/p>\n
This is why sending trays-and their corresponding films-helps ensure the correct engineering decisions.<\/p>\n
<\/p>\n
Even if the correct tray is used, a film mismatch can ruin sealing.<\/p>\n
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Films vary by:<\/p>\n
MAP tray sealer and vacuum skin packaging machine applications especially require precisely matched films.<\/p>\n
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But sending film always results in:<\/p>\n
If customers cannot send film, they must at least specify the material. This allows DJPACK to use equivalent films during testing.<\/p>\n
<\/p>\n
Film must be suitable for the tray material.<\/p>\n
Film must seal cleanly without bubbles or leaks.<\/p>\n
Film must peel correctly (if easy peelable type).<\/p>\n
Testing ensures all three conditions are met.<\/p>\n
<\/p>\n
DJPACK supports\u00a0new factories and startups that do not yet have packaging materials.<\/p>\n
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The company can help source:<\/p>\n
This effectively reduces the purchasing pressure for startups\u2014we help you find reliable and stable consumables suppliers<\/p>\n
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This ensures that when the customer receives the tray sealing machine, they can immediately:<\/p>\n
Reduce setup and consumables arrival time to get into production faster.<\/p>\n
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For larger production needs, DJPACK can recommend stable suppliers, making it easier for customers to buy trays and films later.<\/p>\n
<\/p>\n
In the world of food packaging, precision is everything. A tray that looks simply is actually a complex engineered product. And when matched with the right mold and film, it becomes a powerful combination for freshness, safety, and shelf life.<\/p>\n
Sending trays and film is not an inconvenience.<\/p>\n
It is the foundation of:<\/p>\n
DJPACK\u2019s commitment is simple:<\/p>\n
Every machine should work perfectly the moment it reaches the customer.<\/b><\/p>\n
And the best way to guarantee that is to start with the real trays and real films the customer will use.<\/p>\n
![\"\"](\"https:\/\/www.djpackmachinery.com\/wp-content\/uploads\/2026\/07\/why-sending-sample-trays-and-films-matters3.png\")
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When factories around the world order a\u00a0tray sealing machine, a\u00a0MAP tray sealer, or a\u00a0vacuum skin packaging machine\u00a0from DJPACK (Wenzhou Dajiang Vacuum Packaging Machinery Co., Ltd.), one question frequently comes up: \u201cWhy do I need to send my trays and film to your factory?\u201d At first glance, it may seem like an extra step. But for [\u2026]<\/p>","protected":false},"featured_media":4477,"template":"","meta":{"_acf_changed":false,"footnotes":""},"blog_category":[16],"class_list":["post-4474","blog","type-blog","status-publish","has-post-thumbnail","hentry","blog_category-industry-news"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.djpackmachinery.com\/es\/wp-json\/wp\/v2\/blog\/4474","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.djpackmachinery.com\/es\/wp-json\/wp\/v2\/blog"}],"about":[{"href":"https:\/\/www.djpackmachinery.com\/es\/wp-json\/wp\/v2\/types\/blog"}],"version-history":[{"count":1,"href":"https:\/\/www.djpackmachinery.com\/es\/wp-json\/wp\/v2\/blog\/4474\/revisions"}],"predecessor-version":[{"id":4480,"href":"https:\/\/www.djpackmachinery.com\/es\/wp-json\/wp\/v2\/blog\/4474\/revisions\/4480"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.djpackmachinery.com\/es\/wp-json\/wp\/v2\/media\/4477"}],"wp:attachment":[{"href":"https:\/\/www.djpackmachinery.com\/es\/wp-json\/wp\/v2\/media?parent=4474"}],"wp:term":[{"taxonomy":"blog_category","embeddable":true,"href":"https:\/\/www.djpackmachinery.com\/es\/wp-json\/wp\/v2\/blog_category?post=4474"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}