{"id":6142,"date":"2026-04-10T03:43:25","date_gmt":"2026-04-10T03:43:25","guid":{"rendered":"https:\/\/partsmastery.com\/?p=6142"},"modified":"2026-04-10T03:43:25","modified_gmt":"2026-04-10T03:43:25","slug":"blow-mold-the-complete-guide-to-hollow-part-manufacturing","status":"publish","type":"post","link":"https:\/\/partsmastery.com\/ja\/blow-mold-the-complete-guide-to-hollow-part-manufacturing\/","title":{"rendered":"\u30d6\u30ed\u30fc\u91d1\u578b\uff1a\u4e2d\u7a7a\u90e8\u54c1\u88fd\u9020\u306e\u5b8c\u5168\u30ac\u30a4\u30c9"},"content":{"rendered":"

\u30d6\u30ed\u30fc\u91d1\u578b\uff1a\u4e2d\u7a7a\u90e8\u54c1\u88fd\u9020\u306e\u5b8c\u5168\u30ac\u30a4\u30c9<\/h1>\n

Keyword:<\/strong>\u00a0Blow mold<\/p>\n

 <\/p>\n

\"Blow
Blow Mold<\/figcaption><\/figure>\n

When you need hollow plastic parts\u2014bottles, containers, automotive ducts, or fuel tanks\u2014the\u00a0blow mold<\/strong>\u00a0is the essential tool. Unlike injection molding, which fills a closed cavity, a\u00a0blow mold<\/strong>\u00a0works like making a glass bottle: a hollow tube of molten plastic (called a parison) is clamped inside the\u00a0blow mold<\/strong>, and compressed air inflates the plastic against the cold cavity walls. At\u00a0\u30d1\u30fc\u30c4\u30de\u30b9\u30bf\u30fc<\/strong>, we design and manufacture precision\u00a0blow mold<\/strong>\u00a0tools that deliver consistent wall thickness, tight neck tolerances, and high-volume production capability.<\/p>\n

This comprehensive guide explains what a\u00a0blow mold<\/strong>\u00a0is, how it works, the different types of blow molding processes, and how to design for manufacturability.<\/p>\n

1. What Is a Blow Mold?<\/h3>\n

A\u00a0blow mold<\/strong>\u00a0is a two-part, hollow tool used to shape molten plastic into hollow objects. The\u00a0blow mold<\/strong>\u00a0consists of two halves that close around a parison\u2014a tube of melted polymer. Once the\u00a0blow mold<\/strong>\u00a0is clamped shut, a blow pin injects compressed air (typically 25-150 PSI) into the parison, expanding it outward until it contacts the cold cavity walls of the\u00a0blow mold<\/strong>. The plastic solidifies, the\u00a0blow mold<\/strong>\u00a0opens, and the finished hollow part is ejected.<\/p>\n

Unlike injection molds, which require complex cores to create hollow sections, a\u00a0blow mold<\/strong>\u00a0uses air pressure as the core. This makes\u00a0blow mold<\/strong>\u00a0tools significantly simpler and less expensive than injection molds for hollow parts. However, a\u00a0blow mold<\/strong>\u00a0cannot produce intricate internal geometries or precise external details on the inside surface.<\/p>\n

2. Types of Blow Molding Processes<\/h3>\n

The design of your\u00a0blow mold<\/strong>\u00a0depends heavily on which blow molding process you are using:<\/p>\n

Extrusion Blow Molding (EBM):<\/strong>
\nThe most common\u00a0blow mold<\/strong>\u00a0application. A vertical extruder produces a continuous parison. Two\u00a0blow mold<\/strong>\u00a0halves close around the parison, pinching the bottom to seal it. Air is blown through a blow pin at the top. EBM\u00a0blow mold<\/strong>\u00a0tools are relatively simple and inexpensive. Typical products: detergent bottles, milk jugs, automotive windshields.<\/p>\n

Injection Blow Molding (IBM):<\/strong>
\nA two-step process. First, an injection mold pre-form is produced (like a test tube with threads). This pre-form is transferred to a\u00a0blow mold<\/strong>, where it is reheated and expanded. IBM\u00a0blow mold<\/strong>\u00a0tools produce high-precision necks and consistent wall thickness. Typical products: pharmaceutical bottles, small cosmetic containers.<\/p>\n

Injection Stretch Blow Molding (ISBM):<\/strong>
\nSimilar to IBM but with a stretch rod that elongates the pre-form before blowing. The\u00a0blow mold<\/strong>\u00a0for ISBM must accommodate both the stretch rod and the blow air. This process orients the polymer molecules, creating stronger, clearer bottles. Typical products: PET water bottles, soda bottles.<\/p>\n

3D Blow Molding:<\/strong>
\nA specialized\u00a0blow mold<\/strong>\u00a0process for complex, curved hollow parts like automotive air ducts or fuel filler pipes. The\u00a0blow mold<\/strong>\u00a0opens in multiple directions, allowing the parison to be placed in a non-straight configuration.<\/p>\n

3. Materials Used in Blow Molds<\/h3>\n

The\u00a0blow mold<\/strong>\u00a0must withstand repeated clamping forces and temperature cycles. Material selection is critical:<\/p>\n

Aluminum (6061-T6, 7075-T6):<\/strong>
\nThe most common\u00a0blow mold<\/strong>\u00a0material for prototype and low-to-medium volume production (10,000-100,000 cycles). Aluminum\u00a0blow mold<\/strong>\u00a0tools offer excellent thermal conductivity (faster cooling) and lower cost. 7075-T6 is harder and more wear-resistant than 6061.<\/p>\n

P-20 Tool Steel:<\/strong>
\nFor high-volume\u00a0blow mold<\/strong>\u00a0applications (500,000+ cycles). P-20 is pre-hardened (30-36 HRC) and resists wear from abrasive resins like glass-filled HDPE. A steel\u00a0blow mold<\/strong>\u00a0costs more but lasts significantly longer.<\/p>\n

Beryllium Copper:<\/strong>
\nUsed for\u00a0blow mold<\/strong>\u00a0pinch-off areas\u2014the sharp edge that seals the parison. Beryllium copper transfers heat rapidly, preventing the plastic from sticking to the\u00a0blow mold<\/strong>\u00a0pinch-off.<\/p>\n

Stainless Steel (420, 316):<\/strong>
\nFor\u00a0blow mold<\/strong>\u00a0applications involving corrosive polymers (PVC, fluoropolymers) or medical\/pharmaceutical cleanroom environments.<\/p>\n

4. Critical Design Elements of a Blow Mold<\/h3>\n

A successful\u00a0blow mold<\/strong>\u00a0incorporates several key features:<\/p>\n

Cavity Surface:<\/strong>
\nThe\u00a0blow mold<\/strong>\u00a0cavity determines the external shape of the finished part. Cavity surfaces must be polished or textured according to the desired finish. Vents (0.02-0.05mm deep) are machined into the\u00a0blow mold<\/strong>\u00a0cavity to allow trapped air to escape as the parison expands.<\/p>\n

Pinch-Off Edges:<\/strong>
\nThe sharpest feature in any\u00a0blow mold<\/strong>\u00a0is the pinch-off. This narrow land (typically 0.5-1.5mm wide) seals the parison closed at the bottom and around the neck. A\u00a0blow mold<\/strong>\u00a0pinch-off that is too sharp will cut the parison; too blunt will fail to seal. Pinch-off angles are typically 45-60 degrees.<\/p>\n

Neck Finish:<\/strong>
\nFor bottles and containers, the\u00a0blow mold<\/strong>\u00a0must include the neck threads or snap features. In IBM and ISBM, the neck is fully formed in the injection stage. In EBM, the\u00a0blow mold<\/strong>\u00a0includes neck tooling that forms the threads and sealing surface.<\/p>\n

Cooling Channels:<\/strong>
\nA\u00a0blow mold<\/strong>\u00a0must rapidly remove heat from the expanded plastic. Cooling channels (water lines) are drilled within 10-15mm of the cavity surface. Efficient\u00a0blow mold<\/strong>\u00a0cooling reduces cycle time by 20-40%.<\/p>\n

Venting:<\/strong>
\nAs the parison expands inside the\u00a0blow mold<\/strong>, air trapped between the plastic and the cavity must escape. Venting slots (0.02mm deep) are cut into the\u00a0blow mold<\/strong>\u00a0parting line and cavity surface. Insufficient venting causes surface defects (dimples or “orange peel”).<\/p>\n

5. The Blow Mold Manufacturing Process<\/h3>\n

Building a precision\u00a0blow mold<\/strong>\u00a0requires specialized machining and quality control:<\/p>\n

1. Design and Simulation:<\/strong>
\nWe use blow molding simulation software to predict parison sag, wall thickness distribution, and pinch-off sealing. This optimizes the\u00a0blow mold<\/strong>\u00a0design before cutting any metal.<\/p>\n

2. CNC Machining:<\/strong>
\nThe\u00a0blow mold<\/strong>\u00a0halves are rough-cut from aluminum or steel blocks, then finish-machined using 5-axis CNC. Surface finishes of 0.8 microns Ra are typical for\u00a0blow mold<\/strong>\u00a0cavities.<\/p>\n

3. Polishing and Texturing:<\/strong>
\nThe\u00a0blow mold<\/strong>\u00a0cavity is hand-polished to the specified finish (SPI A-1 for glossy bottles, SPI B-2 for matte containers). Textures (leather, wood grain, geometric patterns) are applied via chemical etching or EDM.<\/p>\n

4. Cooling Line Drilling:<\/strong>
\nCooling channels are drilled deep into the\u00a0blow mold<\/strong>\u00a0using cross-drilling or gun drilling. Baffles and bubblers are installed to direct coolant into specific\u00a0blow mold<\/strong>\u00a0regions.<\/p>\n

5. Vent Cutting:<\/strong>
\nVenting slots are cut using a diamond wheel or wire EDM. The\u00a0blow mold<\/strong>\u00a0vent depth is critical\u2014too deep leaves flash on the part; too shallow traps air.<\/p>\n

6. Common Blow Mold Defects and Solutions<\/h3>\n
\n
\n
<\/div>\n
<\/div>\n<\/div>\n\n\n\n\n\n\n\n\n\n\n
\u6b20\u9665<\/th>\nCause<\/th>\nSolution<\/th>\n<\/tr>\n<\/thead>\n
Blowout (hole in part)<\/td>\nPinch-off too sharp; parison too thin<\/td>\nRound pinch-off edge; increase parison wall thickness in\u00a0blow mold<\/strong><\/td>\n<\/tr>\n
Uneven wall thickness<\/td>\nParison sag; uneven cooling<\/td>\nAdjust extrusion speed; add cooling to specific\u00a0blow mold<\/strong>\u00a0zones<\/td>\n<\/tr>\n
Weld line (visible seam)<\/td>\nParison folds meeting inside\u00a0blow mold<\/strong><\/td>\nIncrease blow pressure; modify parison shape<\/td>\n<\/tr>\n
Flash (excess plastic at pinch)<\/td>\nPinch-off too blunt;\u00a0blow mold<\/strong>\u00a0not fully clamped<\/td>\nSharpen pinch-off; increase clamp tonnage<\/td>\n<\/tr>\n
Fish eyes (unmelted particles)<\/td>\nContaminated resin; degraded polymer<\/td>\nClean extruder; check resin quality before\u00a0blow mold<\/strong>\u00a0run<\/td>\n<\/tr>\n
Matte surface (loss of gloss)<\/td>\nBlow mold<\/strong>\u00a0too cold; insufficient blow pressure<\/td>\nIncrease\u00a0blow mold<\/strong>\u00a0temperature; raise blow air pressure<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

7. Applications of Blow Molds<\/h3>\n

You will find\u00a0blow mold<\/strong>\u00a0technology across virtually every industry:<\/p>\n

\u30d1\u30c3\u30b1\u30fc\u30b8\u30f3\u30b0\uff1a<\/strong>
\nThe largest\u00a0blow mold<\/strong>\u00a0application. Bottles, jars, jugs, and containers for beverages, detergents, personal care products, and industrial chemicals. A single\u00a0blow mold<\/strong>\u00a0can produce 2,000-10,000 bottles per hour.<\/p>\n

\u81ea\u52d5\u8eca\uff1a<\/strong>
\nFuel tanks, windshield washer reservoirs, air ducts, fluid hoses, and bumper beams. Automotive\u00a0blow mold<\/strong>\u00a0tools often use steel for high-volume production (500,000+ parts per year).<\/p>\n

\u30e1\u30c7\u30a3\u30ab\u30eb\u3060\uff1a<\/strong>
\nSaline bottles, urine collection containers, and pharmaceutical packaging. Medical\u00a0blow mold<\/strong>\u00a0tools are made from stainless steel and operated in cleanroom environments.<\/p>\n

Consumer Goods:<\/strong>
\nSports bottles, toys, lawn edging, and hollow furniture components. Consumer\u00a0blow mold<\/strong>\u00a0applications prioritize surface finish and color consistency.<\/p>\n

8. Blow Mold Maintenance and Longevity<\/h3>\n

A well-maintained\u00a0blow mold<\/strong>\u00a0can last for millions of cycles. Follow these guidelines:<\/p>\n

    \n
  • \n

    Daily:<\/strong>\u00a0Clean\u00a0blow mold<\/strong>\u00a0cavities with air and soft cloth. Inspect pinch-off edges for nicks or wear. Check vent channels for debris.<\/p>\n<\/li>\n

  • \n

    Weekly:<\/strong>\u00a0Verify cooling water flow rate and temperature. Inspect\u00a0blow mold<\/strong>\u00a0alignment pins for wear.<\/p>\n<\/li>\n

  • \n

    Monthly:<\/strong>\u00a0Remove\u00a0blow mold<\/strong>\u00a0and inspect cavity surfaces under magnification. Repolish minor scratches.<\/p>\n<\/li>\n

  • \n

    Annually or every 500,000 cycles:<\/strong>\u00a0Full\u00a0blow mold<\/strong>\u00a0refurbishment. Re-cut pinch-off edges. Re-chrome worn surfaces. Replace cooling seals.<\/p>\n<\/li>\n<\/ul>\n

    9. Extrusion Blow Mold vs. Injection Blow Mold: Which to Choose?<\/h3>\n
    \n
    \n
    <\/div>\n
    <\/div>\n<\/div>\n\n\n\n\n\n\n\n\n\n\n
    Factor<\/th>\nExtrusion Blow Mold<\/th>\nInjection Blow Mold<\/th>\n<\/tr>\n<\/thead>\n
    Tool cost<\/td>\nLower ($5,000-$20,000)<\/td>\nHigher ($15,000-$50,000)<\/td>\n<\/tr>\n
    Cycle time<\/td>\n5-30 seconds<\/td>\n8-20 seconds<\/td>\n<\/tr>\n
    Neck precision<\/td>\nModerate<\/td>\nExcellent (threads fully formed)<\/td>\n<\/tr>\n
    Material waste<\/td>\nHigh (flash must be trimmed)<\/td>\nLow (no flash)<\/td>\n<\/tr>\n
    Part size range<\/td>\n50ml to 1000L<\/td>\n5ml to 500ml<\/td>\n<\/tr>\n
    Best for<\/td>\nLarge containers, irregular shapes<\/td>\nSmall, high-precision bottles<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

    10. The PartsMastery Approach to Blow Mold Manufacturing<\/h3>\n

    \u3067\u00a0\u30d1\u30fc\u30c4\u30de\u30b9\u30bf\u30fc<\/strong>, we do not simply cut two cavities in aluminum. We engineer a\u00a0blow mold<\/strong>\u00a0that accounts for your specific polymer, blow ratio, cooling method, and downstream trimming.<\/p>\n

    Our\u00a0blow mold<\/strong>\u00a0process includes:<\/p>\n

      \n
    1. \n

      Material selection:<\/strong>\u00a0Matching aluminum, P-20 steel, or stainless to your volume and resin.<\/p>\n<\/li>\n

    2. \n

      Simulation:<\/strong>\u00a0Blow molding simulation to predict wall thickness distribution and optimize\u00a0blow mold<\/strong>\u00a0geometry.<\/p>\n<\/li>\n

    3. \n

      Precision manufacturing:<\/strong>\u00a05-axis CNC, hand polishing, and vent cutting to achieve defect-free\u00a0blow mold<\/strong>\u00a0performance.<\/p>\n<\/li>\n

    4. \n

      Pinch-off optimization:<\/strong>\u00a0Engineering the pinch-off land width and angle for clean sealing without blowouts.<\/p>\n<\/li>\n

    5. \n

      Cooling design:<\/strong>\u00a0Strategic cooling channel placement to minimize cycle time while maintaining part quality.<\/p>\n<\/li>\n<\/ol>\n

      \u7d50\u8ad6<\/h3>\n

      The\u00a0blow mold<\/strong>\u00a0is a remarkable tool that transforms simple plastic tubes into complex, hollow, high-performance products. From the water bottle in your hand to the fuel tank in your car,\u00a0blow mold<\/strong>\u00a0technology touches daily life. Whether you need an aluminum\u00a0blow mold<\/strong>\u00a0for a pilot run of 10,000 bottles or a hardened steel\u00a0blow mold<\/strong>\u00a0for millions of automotive ducts, precision engineering determines your success.<\/p>\n

      A well-designed\u00a0blow mold<\/strong>\u00a0delivers consistent wall thickness, clean pinch-off seals, and fast cycle times. A poorly designed\u00a0blow mold<\/strong>\u00a0creates leaks, uneven walls, and endless scrap.<\/p>\n

      Ready to bring your hollow part to production with a high-performance\u00a0blow mold<\/strong>? Contact\u00a0\u30d1\u30fc\u30c4\u30de\u30b9\u30bf\u30fc<\/strong>\u00a0today at\u00a0+86 13530838604 (WeChat)<\/strong>\u00a0. Send us your 3D CAD file, desired volume, and resin specification. We will deliver a\u00a0blow mold<\/strong>\u00a0that runs right the first time, every time.<\/p>","protected":false},"excerpt":{"rendered":"

      Blow Mold: The Complete Guide to Hollow Part Manufacturing Keyword:\u00a0Blow mold   When you need hollow plastic parts\u2014bottles, containers, automotive ducts, or fuel tanks\u2014the\u00a0blow mold\u00a0is the essential tool. Unlike injection molding, which fills a closed cavity, a\u00a0blow mold\u00a0works like making a glass bottle: a hollow tube of molten plastic (called a parison) is clamped inside the\u00a0blow mold, and compressed air inflates the plastic against the cold cavity walls. At\u00a0PartsMastery, we design and manufacture precision\u00a0blow mold\u00a0tools that deliver consistent wall thickness, tight neck tolerances, and high-volume production capability. This comprehensive guide explains what a\u00a0blow mold\u00a0is, how it works, the different types of blow molding processes, and how to design for manufacturability. […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1,13],"tags":[146],"class_list":["post-6142","post","type-post","status-publish","format-standard","hentry","category-blog","category-cnc-machining-articles","tag-blow-mold"],"blocksy_meta":[],"acf":[],"yoast_head":"\nBlow Mold: The Complete Guide to Hollow Part Manufacturing -PartsMastery<\/title>\n<meta name=\"description\" content=\"The blow mold consists of two halves that close around a parison\u2014a tube of melted polymer.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/partsmastery.com\/ja\/blow-mold-the-complete-guide-to-hollow-part-manufacturing\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" 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