introdução
ISO (Organização Internacional para Padronização) é uma aliança global de organismos de normalização nacionais (Organismos membros da ISO). O desenvolvimento de normas internacionais geralmente é realizado por meio de comitês técnicos da ISO. Cada instituição membro interessada em um assunto no qual um comitê técnico foi estabelecido tem o direito de ser representado nesse comitê. Organizações governamentais e não governamentais internacionais em ligação com a ISO também estão envolvidas neste trabalho. A ISO trabalha em estreita colaboração com a Comissão Eletrotécnica Internacional (IEC) em todos os assuntos de padronização elétrica.
As normas internacionais são elaboradas de acordo com as regras fornecidas na Parte 2 da Diretiva ISO/IEC.
A principal tarefa do comitê técnico é desenvolver padrões internacionais. O projeto de norma internacional adotado pelo Comitê Técnico será distribuído aos órgãos membros para votação. A publicação como padrão internacional requer aprovação de pelo menos 75% das instituições membros.
ISO 12625-12-2010 “Tissue paper and tissue paper products – Papel 12- Determination of tensile strength of perforated lines – Calculation of perforation efficiency”
Observe que certos elementos deste documento podem estar sujeitos a direitos de patente. A ISO não é responsável por identificar nenhuma ou todas essas patentes.
ISO 12625-12 by the Technical Committee of the European Committee for Standardisation (CEN) CEN/TC 172 (Pulp, paper and board) in collaboration with the Technical Committee ISO/TC 6 (Papel, board and pulp), Subcomitê SC 2 (Test methods and quality specifications for paper and board), Prepared in accordance with the Technical Cooperation Agreement between ISO and CEN (Acordo de Viena).
ISO 12625 consiste nas seguintes partes, under the general heading Tissue paper and household paper products:
– Papel 1: General principles of terminology use
– Papel 3: Determinação da espessura, swelling thickness and apparent packing density
– Papel 4: Determination of tensile strength, tensile at break and tensile energy absorption
ISO 12625-12-2010 “Tissue paper and tissue paper products – Papel 12- Determination of tensile strength of perforated lines – Calculation of perforation efficiency”
– Papel 5: Determination of wet tensile strength
– Papel 6: Determination of gram weight
– Papel 7: Determination of optical properties
– Papel 8: Water absorption time and capacity, basket soaking test method
– Papel 9: Determination of the bursting strength of the ball
– Papel 12: Determination of tensile strength of perforating lines – Calculation of perforating efficiency
The following sections are under preparation:
– Papel 13: Determination of spectral reflectance (luminance) at wavelength R 457 nm, with and without ultraviolet stimulation and opacity
ISO 12625-12-2010 “Tissue paper and tissue paper products – Papel 12- Determination of tensile strength of perforated lines – Calculation of perforation efficiency”
introduzir
Paper towels such as toilet paper and kitchen towels are usually pre-cut. They are used after separating two consecutive sheets of paper.
It is important to understand the efficiency of pre-cut perforation.
The perforation strength should be enough to ensure the cohesion of the product, but not too high, so that the sheet can be easily separated. Depending on the type of tissue product, the force can be applied perpendicular to or in the direction of the piercing line.
Esta parte da ISO 12625 was prepared by harmonizing the standards applicable to tissue paper and tissue paper products currently in use. It specifies a procedure for determining perforation efficiency based on the method described in ISO 12625-4 for the determination of tensile strength of tissue paper and tissue paper products.
1 Faixa
Esta parte da ISO 12625 specifies a test method for determining the tensile strength of perforated lines of tissue paper. It uses tensile test equipment that operates at a constant elongation rate.
This method is only used to measure the tensile strength in the direction of the machine, ou seja. for cross-direction perforations on tissue paper.
The calculation of perforation efficiency is also specified in this part of ISO 12625.
It is clearly stated that testing for impurities and impurities in tissue paper and tissue paper products can be carried out according to ISO 15755.
In order to determine the moisture content of tissue paper and household paper products, ISO 287 can be applied.
ISO 12625-12-2010 “Tissue paper and tissue paper products – Papel 12- Determination of tensile strength of perforated lines – Calculation of perforation efficiency”
2 referências normativas
The following reference files are difficult or lacking for the use of this document. Para referências datadas, apenas a versão citada se aplica. Para referências não datadas, uma nova versão da referência (incluindo quaisquer revisões) aplica-se.
ISO 186, Paper and board – sampling to determine average quality
ISO 187, Papel, board and pulp – Standard atmospheres for conditioning and testing and procedures for monitoring sample atmospheres and conditioning
ISO 536, paper and board – Determination of gram weight
ISO 1924-2, Paper and board – Determination of tensile properties – Papel 2: constant elongation method (20 mm/min)
ISO 7500-1, Materiais metálicos – Verification of static uniaxial testing machines – Papel 1: Máquinas de teste de tração/compressão – Verification and calibration of force measuring systems
ISO 12625-1, tissue and household paper products – Papel 1: General guidance on terminology
ISO 12625-12-2010 “Tissue paper and tissue paper products – Papel 12- Determination of tensile strength of perforated lines – Calculation of perforation efficiency”
3 Termos e definições
Para efeitos deste documento, os termos e definições fornecidos na ISO 12625-1 e abaixo se aplicam.
3.1 Tensile strength S
In a tensile test, the maximum tensile force a specimen is subjected to per unit width before breaking
3.2 Punch efficiency
The difference in tensile strength between the non-perforated and the perforated material from the same sample divided by the tensile strength of the non-perforated material
Observação 1: Performance efficiency is expressed as a percentage.
Observação 2: The higher the perforation efficiency, the easier the sheet separation.
3.3 Pull Rod
Uncut area in the punch line
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