GB/T 20445-2017 in English
VALIDPlaned lumber
- Issued on:2017-12-29
- Implemented on:2018-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$156.00
| Standard No: | GB/T 20445-2017 |
| Document status: | VALID |
| Title in English: | Planed lumber |
| Title in Chinese: | 刨光材 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2017-12-29 |
| Implemented on: | 2018-07-01 |
| Superseding: |
GB/T 20445-2006 Planed sawn timber
|
| ICS Classification: | 79.080-Semi-manufactures of timber |
| Chinese Classification: | B69-Timber and processed timber |
| Professional Classification: | GB-National Standard |
| Related Keywords: | planed timber introduction gb/t
planed timber lumber introduction in-depth interpretation allowable limit dimension name dimension range grade deviation length wood processing industry |
| Related Topics: | GBT20445
GB/T 20445-2006 GB/T 20445-2017 Planed wood |
《GB/T 20445-2017刨光材》由TC41（全国木材标准化技术委员会）归口，TC41SC2（全国木材标准化技术委员会原木和锯材分会）执行，主管部门为国家林业和草原局。
Introduction
In-depth interpretation of GB/T 20445—2017 National Standard for Planed Timber
Introduction
GB/T 20445—2017 Planed Timber is an important specification for the wood processing industry, replacing the previous GB/T 20445—2006 version. This standard has comprehensively revised and expanded the terminology, applicable tree species, dimensional deviation, material indicators and inspection methods, aiming to improve product quality and technical requirements.
Standard Overview
1. Scope and Applicability
- Applicable to the production, processing and circulation of planed timber.
- The main technical indicators include dimensional deviation, material defects, moisture content, etc.
- Term definitions such as planing, planing defects, etc.
2. Technical requirements update
Compared with the old version, the main changes include:
- Supplementation and improvement of terms and definitions.
- The scope of applicable tree species has been expanded to include more conifers and broad-leaved trees.
- Size deviation adjustment and material index refinement.
- Optimization of inspection methods, introduction of advanced technologies such as electrical measurement methods.
Technical Requirements Detailed Explanation
Dimension Deviation and Allowable Limit
| Dimension Name | Dimension Range | Grade | Deviation |
|---|---|---|---|
| Length | <2 m | 0.1 m | ±cm |
| 2.0 m~8.0 m | 0.2 m | - | |
| Width | 20 mm~300 mm | 5 mm | ±1 mm |
| Thickness | 10mm~100mm | 5 mm | ±0.5 mm |
Material Index Comparison and Analysis
Table 2 specifies in detail the allowable limits of defects for each grade of planed timber, including dead knots, live knots, cracks, etc. Take the special grade and the third grade as examples:
- Dead knot: ≤5% for the special grade, no limit for the third grade.
- Live knot: ≤5 mm for the special grade, no limit for the third grade.
- Rotten: 0% for the special grade, ≤10% for the third grade.
Comparison of standard framework and technical evolution
Comparison of old and new versions
| Technical points | Additions/changes in the 2017 version | Regulations of the 2006 version |
|---|---|---|
| Applicable tree species | Add broad-leaved tree species such as Paulownia and Quercus acutissima. | Mainly coniferous trees, some broad-leaved trees. |
| Dimension deviation | Refine the allowable deviation of length and thickness. | Uniform regulations, no grades. |
| Testing methods | Introducing the electrical method for determining moisture content. | Only laboratory testing methods are specified. |
Technical progress analysis
The 2017 version introduces more advanced testing methods and quality control standards, reflecting the technological development of the wood processing industry. For example:
- The use of electrical testing methods improves testing efficiency.
- The classification management of the allowable limit of defects is more scientific.
- Added the study of the applicability of new tree species.
Implementation suggestions
Enterprise application suggestions
- Training and dissemination: Organize employees to learn the new standards to ensure the correct understanding of technical requirements and testing methods.
- Equipment upgrade: Equipped with advanced measuring tools such as vernier calipers, electric measuring instruments, etc. to meet higher precision requirements.
- Quality control: Establish an internal testing process and strictly verify the size, material and moisture content in accordance with the standards.
Notes on the user side
- Specify the implementation of GB/T 20445-2017 standard when clarifying procurement needs.
- Sampling inspection shall be carried out according to the indicators specified in the standard when accepting goods.
- Negotiate special packaging and transportation requirements with suppliers to ensure product quality.
Policy recommendations
The government should strengthen the promotion and supervision of standards, encourage industry technical exchanges, and promote the standardization and high-quality development of the wood processing industry.
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