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Testing Requirements(ASTM 4649) Stretch Wrap Films for Transport Packaging

admin — Thu, 21 Jul 2011 08:56:49 +0000

Wrap film is also called stretch film that features light weight, flexibility and flimsy with excellent tensile resistance performances, expansion and self-adhesive performances. Its application in transport packaging is a way to improve packaging efficiency and to reduce costs.

BB/T0024-2004 Stretch Wrap Films for Transport Packaging refers to stretch wrap films for transport and indirect food contact with polyolefin plastics as main material. ASTM D 4649 further includes EVA, PVC, EMA and other special materials.

BB/T0024-2004 Stretch Wrap Films for Transport Packaging came into implementation on June 1, 2006. This standard adopts ASTM D4649 – 03(2009) Standard Guide for Selection and Use of Stretch Wrap Films. The technical requirements for wrap films in the standard have three parts: size and specification, appearances, and physical and mechanical properties.

1. Size and Specifications:

Thickness Testing refers to GB/T 6672 and ASTM D4649. Labthink PARAM CHY-C2 Thickness Tester and PARAM CHY-CA Thickness Tester (with high accuracy) are applicable.

Appearance refers to GB/T10457－1989, Visual measurement or magnifier is applicable.

Physical and Mechanical Properties

BB/T0024-2004 Stretch Wrap Films for Transport Packaging requires many indexes for physical and mechanical properties, including tensile force, adhesiveness, elastic recovery, permanent deformation, tensile maintenance, force value, puncture resistance, unit area quality deviation, transparency, fogging degree and water vapor permeation quantity, etc.

Tensile force and breaking elongation are also called stretching property, which is an important index for wrap film. Its testing method is GB/T 13022-1991 Plastics-Determination of Tensile Properties of Films. Choose the iv type (long strip) from I, ii, iii and iv types for testing with a width of 15mm. the clamp distance of the tensile tester is 50mm. The testing speed is 250mm／min±25mm／min. The above settings are in compliance with domestic practices, and achieve the convenient sample preparation. Besides, by using long strip, extensometer is not a must any more; and the shortcoming of breakage caused by its thin thickness and extensometer can be avoided. The recommended testing instrument is Labthink PARAM XLW series of Auto Tensile Testers, which has already been popular in packaging industry.

2.In order to determine whether wrap film is capable of protecting the goods free from wetting and moisture absorption during voyage or humid environment, the testing for water vapor transmission quantity is of vital importance. GB/T 1037-1988 Test Method for Water Vapor Transmission of Plastic Film and Sheet-Cup Method can be used for water vapor transmission quantity testing. Labthink PERME TSY-T Water Vapor Transmission Testers of weighing method are the proper testers for WVT testing.

3.Other Physical Indexes

3.1 Cling (peel): the adhesiveness of the two layers of wrap film under stretch or non-stretch state. ASTM D 5458 is applicable, and BLD-200S Auto Stripping Tester, FPT-F1 Friction/Peel Tester as well as other specialized instruments with even horizontal movement function.

3.2 Elastic Recovery: the ratio between the original size and the recovery size of the wrap film after a certain stretching period. The ratio is expressed in percentage. ASTM D 5459 is the method, and Labthink PARAM XLW series of Tensile Testers and BLD-200S Auto Stripping Tester are the applicable testers.

3.3 Permanent Deformation: the ratio of the wrap film stretching and the original length in percentage.

Force at elongation, ASTM D 882 is applicable, and Labthink PARAM series of Auto Tensile Testers are proper testers.

3.4 Stress retention: after stretching the wrap film for a certain ratio, the tensile of keeping this state for a certain period of time vs. force at elongation is the stress retention, which is expressed in percentage. ASTM D 5459 and Labthink PARAM series of Auto Tensile Testers, PARAM BLD-200S Auto Stripping Testers are applicable.

3.5 Protrusion Puncture: is to express the puncture resistance of wrap films, and is expressed by the force when film breaking and the movement. Labthink PARAM series of Tensile Testers are applicable the test.

3.6 Clarity and Haze

Good clarity is necessary for wrap film in application. This test is only for the products less than 0.030mm thickness or transparent products. For clarity, ASTM D 1746 is applicable; for haze, ASTM D 1003 is applicable.

Further details please feel free to contact Shirley via:
TEL: 0086-531-85061080
FAX: 0086-531-85062108
EMAIL: trade2@labthink.cn
SKYPE: shirley-labthink
MSN: shirleywu_labthink@hotmail.com

More about Labthink(http://www.labthink.cn/en):
Labthink focusing on the laboratory testing instruments R&D and production and laboratory IT services, is dedicated to provide professional quality control solutions for customers in packaging, food, pharmaceutical, medical, daily chemistry, printing, adhesive, automotive, petrochemistry, bioscience, construction, new energy and other industries.

Customers worldwide(parts):

Labthink, think for you only!

Labthink Exhibits the Power of Intelligence in Chinaplas 2011

admin — Thu, 23 Jun 2011 03:31:22 +0000

On 17^th-20^th May, 2011, the 25^th International Exhibition on Plastics and Rubber Industries was held in Guangzhou. Labthink exhibited her newly developed X series of intelligent products, and demonstrated powerful functions of Labthink Cystem^TM Online Laboratory Management System, the new laboratory intelligence concept based on cloud-computing. All have obtained favorable responses and recognition, and Labthink booth became one of the crowded booths among the exhibitors.
Chinaplas 2011 is the debut for Labthink Cystem^TM Online Management System, the world leading technology in flexible packaging testing industry; it’s undoubted that this system became the focus. Labthink X series of intelligent instruments also drew the attention of the attending experts, based on their modern designs, patented structures and connecting property to the cloud-computing management platform, etc.
During the exhibition, every Labthink instrument was surrounded by visitors from different places and different industries: experts from quality inspection institutes and academies, engineers from packaging manufacturers, and technicians from packaging users… Detailed product performances and functions were inquired by the visitors, and the booth turned into a seminar for those new products. After learning detailed information, visitors were inspired by the intelligent laboratory management system of Labthink. Many of them expressed their desire for cooperation, among whom, Belorussian client signed the contract during the exhibition, and promised to establish long-term strategic cooperation with Labthink.
As the leader in flexible packaging testing industry, Labthink(http://www.labthink.cn/en) will go on devoting herself to technological innovation and provide industrial clients with more intelligent testing instruments!

More details about Labthink, please feel free to contact Shirley Wu via:

TEL: 0086-531-85061080

FAX: 0086-531-85062108

EMAIL: trade2@labthink.cn

SKYPE: shirley-labthink

MSN: shirleywu_labthink@hotmail.com

CHINAPLAS 2011: Labthink brings new Laboratory Testing technologies and advanced IT achievements

admin — Fri, 13 May 2011 09:24:41 +0000

Labthink launches brand-new Laboratory Testing Instruments and Laboratory IT services for films

Labthink at CHINAPLAS 2011: Booth S21, Hall 1.1

Labthink will participate Chinaplas 2011 at Booth S21 Hall 1.1 during 17~20, May in Guangzhou (China Import & Export Fair Pazhou Complex). We will bring new technology and products of Packaging Quality Control Testing Techniques to each visitor.

Labthink is willing to further strengthen exchanges with professionals of the plastic and rubber industry, and brings more professional information and services with her profound testing control techniques. Labthink(Booth S21, Hall 1.1), inviting and await for your presence respectfully.

For more details, please feel free to visit http://www.labthink.cn

or contact Shirley Wu via:
EMAIL: trade2@labthink.cn
SKYPE: shirley-labthink
MSN: shirleywu_labthink@hotmail.com

More about Labthink:

Labthink focusing on the laboratory testing instruments R&D and production and laboratory IT services, is dedicated to provide professional quality control solutions for customers in packaging, food, pharmaceutical, medical, daily chemistry, printing, adhesive, automotive, petrochemistry, bioscience, construction, new energy and other industries.

Labthink is an international enterprise headquartered in Jinan, China with administrative, sales and service branches in Shanghai, Guangzhou,Brussels and etc.,covering over 40 countries and regions.

More about CHINAPLAS:

CHINAPLAS –Asia’s No.1 International Plastics and Rubber Trade Fair

Accompanying the growth of China’s plastics and rubber industries for nearly 30 years, CHINAPLAS has become a distinguished meeting and business platform for these industries and has also largely contributed to their prosperous development. At present, CHINAPLAS is not only the largest plastics and rubber trade fair in Asia, but also widely recognized by the industry as the 3rd most influential exhibition in the world. Its significance is surpassed only by K Fair in Germany, the world’s premier plastics and rubber trade fair, and NPE in USA, the second largest plastics fair in the world.