GB/T 41102-2021
General technical requirements for injection moulding system for PET preform in packaging field (English Version)
- Standard No.
- GB/T 41102-2021
- Language
- Chinese, Available in English version
- Release Date
- 2021
- Published By
- General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
- Latest
- GB/T 41102-2021
- Scope
- This document specifies the terms and definitions, models, main structures, basic parameters and working conditions, technical requirements, test methods, inspection rules, signs, nameplates, Packaging, transportation and storage requirements. This document is applicable to the design, manufacture, inspection, etc. of preform injection molding mold systems (hereinafter referred to as "molds") for PET bottles used in food, daily chemical, and pharmaceutical industries.
- Introduction
Core Technical Specifications for PET Preform Moulds
According to GB/T41102-2021 standard, the PET preform injection moulding mould system must meet strict mechanical performance and hygiene requirements. This standard is applicable to the production of packaging containers in the food, pharmaceutical and other industries, and puts forward clear indicators for the hot runner system accuracy, cooling efficiency and molding stability of the mould.
Comparison of key performance indicators
Parameter category One-step mold Two-step mold Billing temperature range 100-110℃ <65℃ Upper limit of bottle mouth temperature - 55℃ Heating time requirement ≤1.5 hours (to working temperature) Temperature control accuracy ±5℃
Technical requirements for hot runner system
The standard stipulates that the hot runner system must meet the following requirements:
- Valve needle movement accuracy±0.1mm
- Hot runner plate flatness under working condition＜0.4mm
- Compressed air quality level: solid particles≤level 2, oil content≤0.01mg/m3
- Insulation resistance≥1MΩ
Typical case: After a beverage bottle manufacturer adopted the needle valve hot runner system, the bottle preform qualification rate increased from 98.5% to 99.9%.
Mold materials and processing specifications
20Cr13/40Cr13 materials are recommended for molding parts, and the heat treatment hardness requirements are:
- Cavity/core: 40-55HRC
- Mold parts: 25-40HRC
Parts that are in contact with PET are required to undergo surface hardening and comply with the GB/T19891 hygiene standard.
Implementation suggestions
- 100 mold dry run tests are required for new mold acceptance
- Regularly check the hot runner temperature control deviation (monthly)
- Cooling water needs to maintain pH7-9, hardness <140mg/L CaCO3
- It is recommended to configure an online temperature monitoring system
GB/T 41102-2021 Referenced Document
- BB/T 0060 Packaging Container Polyethylene Terephthalate (PET)
- GB 2894 Safety signs and guideline for the use
- GB/T 13277.1-2008 Compressed air.Part 1:Contaminants and purity classes
- GB/T 13306 Plates
- GB/T 13384 General specifications for packing of mechanical and electrical product
- GB/T 14253 General specification for light industry machinery
- GB/T 17931 Poly(ethylene terephthalate) (PET) resin for bottles
- GB/T 191 Packaging.Pictorial marking for handling of goods
- GB/T 19891 Safety of machinery-Hygiene requirements for the design of machinery
- GB/T 19923 Reuse of urban recycling water-Water quality standard for industrial uses*， 2024-03-15 Update
- GB/T 230.1 Metallic materials.Rockwell hardness test.Part 1:Test method
- GB/T 25156 General specifications and inspection methods of rubber and plastics injection moulding machines
- GB/T 5226.1 Electrical safety of machinery—Electrical equipment of machines—Part 1:General requirements
- GB/T 7311 Classification and editorial nominating method for packaging machinery
- GB/T 9969 General principles for preparation of instructions for use of industrial products
- JB/T 12649 Hot-runner systems of injection moulds for plastics.Specifications
- JB/T 6057 Plastic molding steel technical conditions
GB/T 41102-2021 history
- 2021 GB/T 41102-2021 General technical requirements for injection moulding system for PET preform in packaging field