POCKET TYPE FILTER

• US 3,774,375 A
• Filed: 11/19/1971
• Issued: 11/27/1973
• Est. Priority Date: 11/19/1971
• Status: Expired due to Term

• Current Assignee: Snydergeneral Corp (Daikin Industries Ltd)
• Original Assignee: Tom R. Smith
• Inventors: Smith, Tom R.
• Primary Examiner(s): Nozick, Bernard
• Application Number:
  US05/200,298
• Time in Patent Office: 739 Days
• Field of Search: 55/381,341,382,483,484,497-500,524,528,486,487
• US Class Current: 55/382
• CPC Class Codes: B01D 46/02 Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
• CPC Class Codes: B01D 46/023 Pockets filters, i.e. multiple bag filters mounted on a common frame

Abstract

An improved pocket type fluid filter, the pockets of the filter being fabricated from a fluid permeable batt-scrim laminate joined together by heat seals.

Claims

1. A pocket type fluid filter comprising:

two approximately equal sized sections of a fibrous fluid-permeable batt-scrim laminate, said scrim portion of said laminate being a thermoplastic material;

a heat seal joining said sections of laminate together in facing relationship along their abutting outer side peripheries and closed at one end to define a pocket filter, said outer side peripheries being folded over upon themselves to form four layers of batt scrim laminate, the remaining portion of their outer peripheries forming an open upstream entrance means, said heat seal being comprised of two portions;

(1) a fluid impermeable scrim-impregnated batt portion, and contiguous thereto, (2) a fluid impervious thermoplastic portion defining the outer extremity of said seal, said heat seal being effective to secure the outer peripheries of said laminate sections together in a fluid impervious seam and prevent fluid leakage therethrough; and

selectively spaced fluid impervious seams forming a plurality of parallel pockets joining said sections of batt scrim laminate, said seams being essentially normal to said entrance means and extending a major portion of the distance from the downstream most juncture of said sections toward said entrance means.

2. The fluid filter of claim 1 wherein terminal support means is attached to said open upstream entrance means of said heat sealed sections to define a plurality of upstream pocket mouth portions, one such mouth portion corresponding to each of said parallel pockets.

3. The pocket type fluid filter of claim 1 wherein said scrim impregnated batt portion of said heat seal is fabricated from four layers of laminate and four layers of scrim.

4. The pocket type fluid filteR of claim 1 wherein said selectively spaced seams comprise sonically heat-sealed segments spaced at selected intervals.