{"id":2378,"date":"2026-09-11T15:44:21","date_gmt":"2026-09-11T07:44:21","guid":{"rendered":"https:\/\/www.mold-mif.com\/?p=2378"},"modified":"2026-10-08T16:49:06","modified_gmt":"2026-10-08T08:49:06","slug":"sip-tumbler-lid-two-shot-injection-integrated-accessory","status":"publish","type":"post","link":"https:\/\/www.mold-mif.com\/zh\/sip-tumbler-lid-two-shot-injection-integrated-accessory\/","title":{"rendered":"Sip Tumbler Lid Two-shot Injection Integrated Accessory"},"content":{"rendered":"

A sip lid lives or dies by its sliding closure, and a sliding closure in a transparent lid shows everything: every flash on the track, every witness line where the two materials meet, every speck the melt picked up. The lid shown here is moulded in two shots, a clear outer ring and a tinted centre carrying the slide, so the working parts are visible through the material that surrounds them.<\/p>\n

Three photographs show the closed top with the slide across its track, the underside with the closure’s sealing face, and the lid at an angle. The tint is in the compound, not coated, so it reads through the wall and never wears off.<\/p>\n

\"Transparent
Closed. The tinted slide rides across the clear ring; both materials formed in two coordinated shots.<\/figcaption><\/figure>\n

Why Two Shots Instead of Two Parts<\/h2>\n

The obvious alternative is a clear lid with a separately moulded slide snapped in. That route works until it is washed: a snap-in slider rattles, collects debris under its edge, and eventually lifts. Moulding the slide’s track and the ring as one structure in two shots puts the boundary where the design wants it, mechanically interlocked, with no joint line across the sealing face and nothing for the dishwasher to find.<\/p>\n

The two materials have to agree with each other. Shrinkage rates differ, and where the tinted centre meets the clear ring, a mismatch pulls the interface open or bows the lid. The shot sequence and the interface geometry, undercuts that lock the two together, are designed so the joint is stronger than either material alone at that line.<\/p>\n

\"Underside
The underside. The slide’s sealing face and its track are moulded as one structure across both shots.<\/figcaption><\/figure>\n

The Slide and Its Track<\/h2>\n

The closure slides across the drinking aperture, stopping in moulded detents at each end of travel. The feel of that action is the customer’s daily impression of the lid: definite, not gritty. Track walls are small and their tolerances tight, so the parting line around them is planned rather than wherever the tool happens to split, and any flash shows up instantly in the slide’s action.<\/p>\n

Detent force is tuned against the weight of the closure and the temptation to over-engineer. Too light and the slide drifts open in a bag; too heavy and one-handed operation, the whole point of a sip lid, fails. The balance is set in the steel and verified by cycling.<\/p>\n

\"Angled
The material boundary. The tinted centre and clear ring lock together mechanically across the interface.<\/figcaption><\/figure>\n

Transparent Resin Discipline<\/h2>\n

Transparency raises the process stakes. Moisture in the resin shows as streaks; regrind contamination shows as specks; a wrong melt temperature shows as haze. All three are invisible in a solid-colour lid and obvious in this one, so drying, melt handling and regrind policy are process controls, not preferences. The same discipline applies to the tool: polished cavities, and a maintenance schedule that keeps the polish, because a mirror finish that degrades over a run reads as cloudiness on every part after it.<\/p>\n

What Gets Checked Before Shipping<\/h2>\n

Slide action, cycled by hand across a sample from each lot for grit and detent feel. Seal integrity with the lid closed, tipped and squeezed. Interface integrity between the two shots, checked for voids and lifting after thermal cycling. Optical quality against the approved master: haze, streaks and specks are reject criteria, not observations.<\/p>\n

Information to Confirm Before Starting a Two-Shot Sip Lid Project<\/h2>\n
    \n
  • The tumbler mouth drawing, since thread and seal are built to it.<\/li>\n
  • Slide travel layout and aperture shape, and whether a straw slot shares the top.<\/li>\n
  • Tint and clarity specification for both materials, with masters to match.<\/li>\n
  • Leakproof requirement: hot drinks, carbonation or both, which load the seal differently.<\/li>\n
  • Annual volume, which decides whether the two-shot tool investment pays against a snap-in design.<\/li>\n<\/ul>\n

    Kunshan Maifeng Precision Industry Co., Ltd. reviews two-shot closure 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 tumbler drawing and the slide layout, 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>
    Product structure design and optimization based on customer drawings and samples.<\/p>\n

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

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

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

    5. Product Assembly<\/strong>
    Supporting 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 two-shot sip tumbler lid in clear and tinted resin, with the slide closure and its track moulded as one interlocked structure across both shots.<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[147,140],"tags":[],"class_list":["post-2378","post","type-post","status-publish","format-standard","hentry","category-insulated-bottle-cap-injection-molded-products","category-two-shot-injection-molded-products"],"_links":{"self":[{"href":"https:\/\/www.mold-mif.com\/zh\/wp-json\/wp\/v2\/posts\/2378","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=2378"}],"version-history":[{"count":11,"href":"https:\/\/www.mold-mif.com\/zh\/wp-json\/wp\/v2\/posts\/2378\/revisions"}],"predecessor-version":[{"id":3377,"href":"https:\/\/www.mold-mif.com\/zh\/wp-json\/wp\/v2\/posts\/2378\/revisions\/3377"}],"wp:attachment":[{"href":"https:\/\/www.mold-mif.com\/zh\/wp-json\/wp\/v2\/media?parent=2378"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.mold-mif.com\/zh\/wp-json\/wp\/v2\/categories?post=2378"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.mold-mif.com\/zh\/wp-json\/wp\/v2\/tags?post=2378"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}