Vacuum filter bag with odor removing effect
View Patent ↗The present invention relates to a vacuum filter bag comprising a layer containing immobilized odor-retaining particles characterized in that the abrasion loss of said odor-retaining particles caused by an air flow of 90 cm/s through a 200 cm 2 specimen of said layer for two hours, measured in accordance with DIN 44956 T2, is 0 to 10% by weight of the total odor-retaining particles present before starting the air flow. The vacuum filter bags of the invention have a high dust holding capacity and an excellent long lasting odor removing effect.
1. Vacuum filter bag comprising a layer containing immobilized odor-retaining particles arranged on the most downstream side of the vacuum filter bag, said layer selected from a filter paper, a dry laid non-woven and a wet laid non-woven and characterized in that the abrasion loss of said odor-retaining particles caused by an air flow of 90 cm/s through a 200 cm 2 specimen of said layer for two hours, measured in accordance with DIN 44956 T2, is 0 to 10% by weight of the total odor-retaining particles present before staffing the air flow, and wherein said odor-retaining particles are incorporated in the bulk of said filter paper and wet laid non-woven or are incorporated in a binder used in the making of said layer.
2. The vacuum filter bag according to claim 1 , wherein the abrasion loss of the odor-retaining particles is ≦5% by weight.
3. The vacuum filter bag according to claim 1 , wherein the abrasion loss of the odor-retaining particles is ≦1% by weight.
4. The vacuum filter bag according to claim 1 , wherein the abrasion loss of the odor-retaining particles is substantially zero.
5. The vacuum filter bag according to claim 1 , wherein the content of odor-retaining particles is from 4 to 14wt %, with respect to the layer containing the particles.
6. The vacuum filter bag according to claim 1 wherein the odor-retaining particles are made of zeolite or carbon.
7. Vacuum filter bag according to claim 1 , which is a two-layered filter bag comprising a melt-blown layer arranged on the upstream side of the layer containing said immobilized odor-retaining particles.
8. Vacuum filter bag consisting essentially of one layer containing immobilized odor-retaining particles characterized in that the abrasion loss of said odor-retaining particles caused by an air flow of 90 cm/s through a 200 cm 2 specimen of said layer for two hours, measured in accordance with DIN 44956 T2, is 0 to 10% by weight of the total odor-retaining particles present before starting the air flow.