{"id":2472,"date":"2026-09-14T14:49:57","date_gmt":"2026-09-14T06:49:57","guid":{"rendered":"https:\/\/www.mold-mif.com\/?p=2472"},"modified":"2026-10-20T13:22:03","modified_gmt":"2026-10-20T05:22:03","slug":"semiconductor-wafer-carrier-box","status":"publish","type":"post","link":"https:\/\/www.mold-mif.com\/zh\/semiconductor-wafer-carrier-box\/","title":{"rendered":"Semiconductor Wafer Carrier Box"},"content":{"rendered":"

The wafer carrier box is an open storage and transfer container moulded in semi-transparent PP as one piece. Wafers rest inside on the floor, the tall corner feet let boxes stack without the rim of one touching the wafers in the box below, and the closed walls keep dust off during moves between process areas.<\/p>\n

Nothing on this box is decorative. The rim carries the stacking lip, the feet carry the load, and the floor has to stay flat enough that a stack of wafers sits without rocking. This page walks through the geometry and the tooling behind those three jobs.<\/p>\n

\"Closed
Closed view of the wafer carrier box showing the corner feet that define the stacking gap.<\/figcaption><\/figure>\n

Stacking Feet and the Rim Lip<\/h2>\n

Four corner feet moulded into the body do the stacking. Each foot lands inside the recess of the box below, so the full weight of a stack passes foot to base and never through the wafers. The feet are solid sections on purpose, but each one is ribbed on the inside; a foot thick enough to sink would print its sink mark onto the box below after weeks of stacking.<\/p>\n

The rim carries a shallow outward lip. It stiffens the open mouth of a wide box \u2014 without it, the walls bow outward and stacked boxes lock together. The lip also gives a handhold for carrying the box with gloves on.<\/p>\n

\"Open
Open view showing the interior, the rim lip and the stacking recess.<\/figcaption><\/figure>\n

Warpage on a Wide Flat Rim<\/h2>\n

Half-filled PP is the enemy of a flat rim. A box this wide cools unevenly: the rim solidifies last, and differential shrink across the width will twist the mouth out of plane if the mold does not fight it. Uniform wall sections, generous corner radii and balanced cooling behind both the cavity and the core keep the rim flat enough that stacked boxes sit square.<\/p>\n

We measure the rim on a surface plate, not by eye. The first articles from a new mold are checked at four corners and at the mid-points of each wall; if the mouth is out of flat, the fix is usually in the cooling layout, not in the steel.<\/p>\n

\"Open
Open box seen from above showing the interior floor and wall detail.<\/figcaption><\/figure>\n

Molding a Deep One-Piece Box<\/h2>\n

A deep box is a textbook core-gripping part. Resin is gated so the flow runs down the walls evenly \u2014 multiple gates around the cavity keep the flow front level, and a level front is what lets the corners fill without hesitation marks. Vents sit at the corners and at the rim, because that is where the air ends up.<\/p>\n

Ejection is by stripper ring around the rim plus ejector pads under the floor corners. Semi-transparent PP marks easily, so the ejection faces are wide and polished. The recessed underside you see from below is the core side; it also stiffens the floor against the load of a full stack pressing down through the feet.<\/p>\n

\"Second
Second open view showing the wall thickness and the moulded rim section.<\/figcaption><\/figure>\n

Why Semi-Transparent PP<\/h2>\n

PP shrugs off the acids, solvents and cleaning agents that pass through a wafer fab, generates fewer particles than most rigid resins, and survives drops that would crack a polycarbonate box of the same size. Semi-transparent rather than fully clear is a deliberate trade: the translucency lets an operator confirm contents at a glance, while the resin’s natural haze is put to work instead of fought.<\/p>\n

One honest limitation. Standard PP is insulating, and in areas where static discharge is a concern the customer may need a conductive or antistatic grade. We mold both; the grades machine differently, so the material decision should be made before the mold is designed, not after.<\/p>\n

\"Underside
Underside view of the box showing the recessed base panel and moulded structure.<\/figcaption><\/figure>\n

Information to Confirm Before Starting a Wafer Carrier Box Project<\/h2>\n
    \n
  • Wafer size and carrier format, since the interior dimensions follow them directly.<\/li>\n
  • Stacking height, because the feet and the floor are sized for the worst-case load.<\/li>\n
  • Whether an antistatic or conductive PP grade is required in the working area.<\/li>\n
  • Cleanroom class expectations, which affect packaging and post-molding handling.<\/li>\n
  • The sealing lid interface, if a lid will be moulded or sourced to close the box.<\/li>\n<\/ul>\n

    Kunshan Maifeng Precision Industry Co., Ltd. reviews carrier box designs before quoting, builds the injection molds in house, and molds single-color and dual-color parts on 36 machines from 90 to 700 tons. Send us the wafer format and the stacking requirement, and we will come back with a feasibility comment and a tooling proposal.<\/p>\n

    \n

    Company Profile<\/h2>\n
    \n
    \"Kunshan<\/figure>\n
    \n

    About Us<\/h3>\n

    Kunshan Maifeng Precision Industry Co., Ltd. (MIF) has an investment of RMB 35 million and an independent factory of more than 5,000 m\u00b2. The company operates 36 single- and dual-color injection molding machines from 90 to 700 tons, together with more than 50 sets of mold manufacturing and processing equipment. Our service, management and production team includes over 100 people.<\/p>\n

    Our parent company was established in 2008. We provide product design, mold design and manufacturing, injection molding and product assembly services for custom plastic parts, supporting both domestic and international customers.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

    \n
    \n
    \n

    1. Product Design<\/strong>
    \nProduct structure design and optimization based on customer drawings and samples.<\/p>\n

    2. Mold Design<\/strong>
    \nMold design developed around product geometry, material and production requirements.<\/p>\n

    3. Mold Manufacturing<\/strong>
    \nMachining, polishing, fitting and assembly for custom injection molds.<\/p>\n

    4. Injection Molding<\/strong>
    \nSingle- and dual-color injection molding for project and order requirements.<\/p>\n

    5. Product Assembly<\/strong>
    \nSupporting assembly services for molded plastic components.<\/p>\n<\/div>\n

    \"Maifeng<\/figure>\n<\/div>\n
    \n
    \"Maifeng
    Production Team<\/figcaption><\/figure>\n
    \"Maifeng
    Service Team<\/figcaption><\/figure>\n
    \"Maifeng
    Design Team<\/figcaption><\/figure>\n<\/div>\n<\/section>","protected":false},"excerpt":{"rendered":"

    A one-piece semi-transparent PP wafer carrier box with four corner stacking feet and a stiffened rim lip, sized to the customer’s wafer format for dust-protected storage and transfer between process areas.<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[143,148],"tags":[],"class_list":["post-2472","post","type-post","status-publish","format-standard","hentry","category-household-daily-use-plastic-products","category-injection-molds"],"_links":{"self":[{"href":"https:\/\/www.mold-mif.com\/zh\/wp-json\/wp\/v2\/posts\/2472","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.mold-mif.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.mold-mif.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.mold-mif.com\/zh\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.mold-mif.com\/zh\/wp-json\/wp\/v2\/comments?post=2472"}],"version-history":[{"count":13,"href":"https:\/\/www.mold-mif.com\/zh\/wp-json\/wp\/v2\/posts\/2472\/revisions"}],"predecessor-version":[{"id":4145,"href":"https:\/\/www.mold-mif.com\/zh\/wp-json\/wp\/v2\/posts\/2472\/revisions\/4145"}],"wp:attachment":[{"href":"https:\/\/www.mold-mif.com\/zh\/wp-json\/wp\/v2\/media?parent=2472"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.mold-mif.com\/zh\/wp-json\/wp\/v2\/categories?post=2472"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.mold-mif.com\/zh\/wp-json\/wp\/v2\/tags?post=2472"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}